Exhibit A - EIR Addendum — South San Francisco City Council, September 14, 2022 (part 4 of 15)

property with two commercial buildings (Building A and Building B), a plan which the GPP would not approve until the risk to potential hypothetical future residents could be assessed, and provided that the proposed development would not affect potential remediation efforts. The GPP also requested a waste management plan for soil and groundwater generated during redevelopment activities.

CEMC evaluated risks to future occupants of the two proposed buildings and in August 2012, the GPP concurred with the CEMC conclusion that residual petroleum impacts do not present unacceptable health risks to future occupants of Building B, planned for the northern portion of the Site. To address potential risks related to occupancy of Building A (planned for the vicinity of the former dispensers), CEMC and Stantec proposed to perform soil vapor extraction (SVE).

However, implementation and long-term operation of the SVE remedy was inconsistent with the planned redevelopment, leading CEMC and Stantec to prepare and submit the Revised RAP in July 2014 (Stantec, 2014), which the GPP approved in August 2014. The Revised RAP called for removal of petroleum affected soils (total petroleum hydrocarbons as gasoline or TPHg) to a maximum depth of 20 feet below ground surface (bgs), cessation of groundwater monitoring and reporting, and performance of post-excavation shallow soil vapor sampling in the proposed Building A footprint to demonstrate that residual petroleum hydrocarbons did not pose a vapor intrusion risk to future Site occupants/tenants.

The Revised RAP used State Water Resources Control Board (SWRCB) Low-Threat Underground Storage Tank Case Closure Policy (LTCP) criteria (SWRCB, 2012) to develop remedial objectives and a remedial approach for the Site. The remedial objectives of the excavation were to remove secondary source soils containing elevated TPHg (also using LTCP screening criteria for benzene, ethylbenzene, and naphthalene to guide excavation), and reduce potential vapor migration to future Building A to levels that would have no significant risk. Historically, vapor probes SV-2, SV-3, SV-4, and SV-9 yielded elevated vapor concentrations, exceeding screening levels at five feet bgs. The Revised RAP proposed soil replacement in the vicinity of these probes to address this area of concern.

In August 2017, Shamaim retained SCS to implement the Revised RAP, and the work proceeded until February 2018. On June 18, 2018, SCS submitted a Revised RAP Completion Report (Report, SCS, 2018a) to GPP documenting implementation of the Revised RAP. As presented in the Report, SCS and subcontractors removed petroleum-impacted soil to fulfill the primary remedial objective of reducing potential exposure to residual hydrocarbons remaining below the footprint of future Building A to a level of insignificance. The SCS team removed an approximate total of 4,220 cubic yards of petroleum-impacted soil to maximum depths of 20 feet bgs within the RAP-prescribed excavation footprint. We then backfilled the excavation with clean backfill material, compacting and testing the compaction in approximately 18-inch lifts. Figure 2 presents the Revised RAP-prescribed excavation limits as well as the actual excavation limits achieved by SCS.

1.1 Remedial Objectives and Screening Criteria
The Site remedial objectives follow screening criteria contained in the SWRCB LTCP guidance (SWRCB, 2012) including:
• General Criteria: All general criteria are identified as complete with the exception of secondary source removal. The Revised RAP identified secondary source removal as a remedial objective, and by virtue of the recently-completed soils removal and confirmation sampling, this objective has been achieved;
• Groundwater Media-Specific Criterion: The Revised RAP presented a case which demonstrated this criterion was met, as approved by the GPP in their August 2014 approval letter. Therefore, the Revised RAP did not propose remedial objectives associated with groundwater cleanup;
Mr. Jacob Madden
January 8, 2020

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• Direct Contact and Outdoor Air Exposure Media-Specific Criteria: The LTCP checklist prepared by GPP (see GeoTracker) indicate these criteria have been met; and, • Petroleum Vapor Intrusion to Indoor Air Media-Specific Criterion: Historic soil vapor sampling data did not meet this criterion, as soil vapor data from shallow vapor probes installed at the Site exceeded LTCP soil vapor criteria for a commercially-used site with no bio-attenuation zone (former probe locations SV-2, SV-3, SV-4, and SV-9).

The process of replacing hydrocarbon-impacted soil with clean backfill to depths of 15 to 20 feet bgs established a bio-attenuation zone at the Site, thereby satisfying LTCP soil vapor criteria for commercial use at the Site, as previously agreed upon by GPP.

The backfill material used to replace excavated petroleum-affected soils consisted of quarry fines, characterized by RMC as silty sand to sandy soil. Due to the soil type and relatively recent placement of the backfill, the oxygen content of the backfilled area (or bio-attenuation zone) was expected to be above the minimum 4% value included in the LTCP guidance.

1.2 Equilibrium Evaluation
On behalf of CEMC, Stantec performed an analysis to determine the time required for vapors in subsurface soils (native and imported backfill material) to reach steady state conditions following the excavation of soils impacted by petroleum hydrocarbons and replacement with imported backfill.

Stantec performed this analysis to support the time required post-excavation before follow-on soil vapor sampling at a depth of five feet bgs could be performed to assess residual vapor intrusion risk.

As noted, the Revised RAP implementation work removed impacted soils to depths of between 10 and 20 feet bgs and the excavation was backfilled to grade with quarry fines from the Stevens Creek Quarry in San Jose, California, and with overburden soil documented to be free of petroleum hydrocarbon impacts.

Stantec’s calculations showed that for benzene, a period of 106.41 days was sufficient time to reach steady-state conditions. The actual vapor sampling event occurred in March 2019, over 420 days following the completion of backfill material placement and compaction (January 15, 2018), well beyond the calculated equilibration period.
2 WORK PLAN IMPLEMENTATION
In conformance with the 2019 Work Plan, soil vapor monitoring probes (SV-10 through SV-16) were installed by a C57-licensed driller, PeneCore Drilling (PeneCore) with SCS oversight, on February 7, 2019. We performed probe sampling (SV-10 through SV-14 and SV-16) in March 2019 and again in May 5. Probe SV-15 was installed as a contingency probe and was not sampled as part of the sampling event. The results of these events were described in our September 9, 2019 Summary Letter (SCS, 2019). Appendix A contains a diagram depicting the soil vapor probe construction details.

SCS conducted the first post-soils replacement soil vapor sampling program in March 2019, after observing a period of dry weather following cessation of the winter rainy season of 2018-2019. The first sampling event included:
1) Preliminary Field Activities;
2) Vapor monitoring point installation; and,
3) Vapor monitoring point sampling and analysis.

Based upon elevated vapor analytical results and low oxygen concentration detections in the newly- Mr. Jacob Madden
January 8, 2020

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installed vapor probes, SCS contacted Mr. Jacob Madden of GPP, and proposed conducting a second sampling event following an additional period of dry weather. With Mr. Madden’s concurrence on March 27, 2019, SCS then conducted a second vapor probe sampling event in May 2019.

Both sampling events were conducted following a period of dry weather, and both sets of samples were considered valid, with no sample train integrity compromises.

The laboratory analytical reports prepared by McCampbell noted high organic content in samples collected from probes SV-10, SV- 13, and SV-14 in March, and in SV-10, SV-12, SV-13, SV-14, and SV-16 in May, resulting in sample dilution and elevated RLs. Thus, concentrations of benzene, ethylbenzene, and naphthalene were not reported, with elevated RLs but below applicable LTCP Scenario 4 criteria.

Oxygen concentrations at five feet within the backfill of the previously excavated area during the March event included three locations within the core area (SV-11, SV-12, and SV-13) and one perimeter location (SV-16) above the 4.0% threshold specified in the LTCP. Perimeter locations SV- 10 and SV-14 yielded oxygen concentrations below the 4.0% threshold (2.8 and 1.9%).

Oxygen concentrations were below the 4.0% threshold in samples collected from each five foot probe during the May event.

Carbon dioxide concentrations at locations SV-14 and SV-16 were elevated (7 to 17%) and generally coincident with low oxygen concentrations and low methane concentrations (0.0065 to

0.85%).

Carbon dioxide concentrations in the excavation backfill core area (probes SV-11, SV-12 and SV13) were much lower (0.0044 to 0.047%); however those locations generally exhibited more elevated methane concentrations (1.6 to 2.3%, with one result non-detectable result).

The detections of benzene and ethylbenzene (SV-12 in March and SV-11 in May) coincided with oxygen concentrations of 5.3% and 2.2% respectively) and in neither case did the detected concentrations exceed the corresponding LTCP Scenario 4.

SCS proposed conducting a second seasonal (warm weather) vapor sampling event in September 2019 following the same protocol. The following text describes the methods used and results of the second seasonal soil vapor sampling event conducted on September 25, 2019. 3 WORK SCOPE AND METHODS
On September 25, 2019 SCS conducted the Second (warm weather) Soil Vapor Sampling Event as proposed in our September 9, 2019 Summary Letter (SCS, 2019).

3.1 Preliminary Field Activities
SCS performed preliminary field activities before initiating intrusive tasks. We used the existing Sitespecific Health and Safety Plan (HASP) with the incorporated soil vapor monitoring probe sampling tasks. Our field personnel brought a copy of the HASP to the Site during all field activities. The HASP describes appropriate personnel protective equipment, protocol, and emergency procedures in the event of injury. The HASP also includes a hospital route map, directions, and emergency contacts.

SCS contacted the property owner to confirm access to the area of investigation.

Mr. Jacob Madden
January 8, 2020

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3.2 Soil Vapor Sample Collection and Analysis
Prior to the start of sampling, we performed a tightness test at each location by connecting a syringe to the well tubing and tested for no resistance from the syringe, after which case the tightness test was completed. SCS connected each probe’s tubing to a dedicated laboratory-supplied soil gas sampling manifold using Swagelok fittings. The set-up included an upstream vacuum gauge on each manifold to monitor pressures in the soil vapor probe, a flow regulator set to 167 milliliters-per minute, and a downstream vacuum gauge to monitor pressure in each sampling Summa canister.

The laboratory supplied manifold included a “T” fitting to allow connection to a one-liter sampling Summa canister and a graduated, laboratory supplied syringe for purging. A manifold valve allowed for the isolation of either the Summa or syringe and prevent ambient air entry while switching from purging to sampling. After the sample train was assembled, SCS conducted a shut-in test and borehole integrity test before purging. SCS purged a minimum of two pore volumes of the manifold, tubing, and probe prior to initiation of sample collection.

Once purging was complete, SCS placed a shroud over the probe and entire sampling train, including all connections immediately upon opening the sampling valve. We used a leak detection compound (helium) during the borehole integrity test and sampling. This involved expelling helium across the sample train at each vapor probe during testing and sampling to confirm the competency of the sample train fittings and connections. We used a flow controller in the sampling train to control the flow of soil gas at an approximate rate stated above into the Summa canister for sample collection.

Once the helium tank was opened and once helium reached a concentration of 20% inside the shroud, SCS initiated sampling by opening the Summa canister and manifold sampling valve and continued sampling until the vacuum gauge indicated five inches of mercury (Hg) remain in each Summa canister. SCS field staff recorded pressure readings, helium concentrations, Summa canister pressures, and other pertinent field measurements on Field Logs included as Appendix B.

We transported the collected soil vapor samples (Summa canisters) to a California DHS-certified analytical laboratory (McCampbell Analytical Inc. or McCampbell) under chain of custody (COC) protocol. We requested analysis of: 1) TPHg and VOCs, including naphthalene by Method TO15; 2) fixed gases including oxygen, carbon dioxide, methane by ASTM D 1946-90, and 3) helium as a leak check compound.

3.3 Soil Vapor Analytical Results
As part of the Investigation, SCS collected six samples on Site for analysis by Method TO-15 during each sampling event. Table 1 provides the soil vapor analytical results for LTCP constituents, and Appendix C contains laboratory analytical reports.

SCS evaluated the September 25, 2019 sampling event results with respect to LTCP criteria and the evaluation may be summarized as follows:
 One of the six collected soil vapor samples (SV-11) yielded benzene above the RL at a concentration of 1,800 µg/m3 and below the LTCP Scenario 4 value of 280,000 of µg/m3.

Two of the six samples yielded benzene above the RL at a concentration of 7.0 µg/m3 (SV-10) and 3.8 µg/m3 (SV-14). Three samples did not yield benzene above the RLs;  Two of the six collected soil vapor samples yielded ethylbenzene above the RL at a concentration of 140 µg/m3 (SV-10) and 64 µg/m3 (SV-14), both below the LTCP Scenario 4 value of 3,600,000 µg/m3. Four samples did not yield ethylbenzene above the RLs;  None of the collected soil vapor samples yielded naphthalene at or above the corresponding RLs;
Mr. Jacob Madden
January 8, 2020

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 Oxygen concentrations ranged from 1.1 to 3.7%, all of which fell below the 4.0% LTCP threshold value;
 Carbon dioxide was detected in all six analyzed samples at concentrations ranging from

0.0099 to 24% and methane was detected in all six samples at concentrations ranging from

0.00032 to 0.83%; and,
 Two of the six samples yielded the leak check compound helium at concentrations of

0.095% and 0.097% (SV-10 and SV-16, respectively), above the reporting limit of 0.050 %, but well below the 5% threshold value for leak check detection per the DTSC Guidance. 4 RESULTS SUMMARY
SCS observed a period of over 14 days of dry weather prior to conducting the second (warm weather) sampling event conducted in September 2019. The soil vapor samples collected during the September event are considered valid, and the lack of significant helium in any sample indicates the sample train integrity was not compromised.

Oxygen concentrations were below the 4.0% threshold in samples collected from each five foot probe during the September 2019 event.

Carbon dioxide concentrations at locations SV-14 and SV-16 were elevated (13 to 24%) and generally coincident with low oxygen concentrations and low methane concentrations (0.0042 to 0.76%).

Carbon dioxide concentrations in the excavation backfill core area (probes SV-11, SV-12 and SV-13) were much lower (0.0099 to 0.28%); however those locations generally exhibited similar methane concentrations (0.00032 to 0.83%).

The presence of elevated concentrations of TPHg in soil vapor, the laboratory notation about high organic content in soil vapor samples, and the relatively higher methane concentrations in the excavation core soil vapor probes indicate natural degradation of the residual petroleum hydrocarbons is occurring, generating methane, and using the available oxygen. This may explain the generally low oxygen concentrations in a clean and permeable backfill media that would otherwise be expected to exhibit much higher oxygen concentrations.
5 RECOMMENDATIONS
This Summary Letter fulfills the work scope prescribed in the GPP-approved Revised RAP (Stantec, 2014), and SCS’ November 14, 2018 Work Plan (SCS, 2018b), as amended by subsequent correspondence with GPP (SCS, 2019 and GPP, 2019). The collected data demonstrate active, natural degradation of residual petroleum hydrocarbons in the Site subsurface and this process has created an oxygen deficiency in the subsurface.

We therefore propose to conduct a short term (two week) soil vapor extraction (SVE) pilot test, using a mobile thermal/catalytic oxidizer to withdraw soil vapor from probes/wells installed to depths of five toc twenty feet within the excavated and backfilled area at the Site. The pilot test is expected to reduce the residual mass of petroleum-affected soil vapor and increase oxygen concentration within the clean backfilled area. The pilot test will include data collection from the existing probes to document residual oxygen, benzene, ethylbenzene, and naphthalene concentrations during and following the pilot test. In the event extracted petroleum VOC concentrations increase or do not decline after 2 weeks, we propose to continue the pilot test for a period not to exceed 30 days. We will present a Work Plan for the pilot test as a separate submittal.

Mr. Jacob Madden
January 8, 2020

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6 LIMITATIONS AND DISCLAIMER
SCS Engineers (SCS) has prepared this Summary Letter for Shamaim and CEMC with specific application to the Site located at 190-192 El Camino Real, South San Francisco, California. We conducted field activities in accordance with the care and skill generally exercised by reputable professionals, under similar circumstances, in this or similar localities. SCS makes no other warranty, either expressed or implied, as to the professional advice presented herein.

Changes in Site use and conditions may occur due to variations in rainfall, temperature, water usage, or other factors. Additional information that may not have been available to SCS at the time of our work or changes which may occur on the Site or in the surrounding area may result in Site modifications that would impact the summary presented herein. This document is not a legal opinion.

Please do not hesitate to contact us with any questions or comments at (925) 426-0080.

Sincerely,
Natasha Maranhas James G. Ritchie, PG, QSD
Staff Professional Project Director/Vice President

SCS ENGINEERS SCS ENGINEERS
cc:

Mr. Roberto Davidsohn, Shamaim
Ms. Shelby Lathrop, CEMC
Mr. Robert Goodman, Rogers Joseph O’Donnell
Mr. Stuart Block, Stice-Block
Mr. Tom Graf, GrafCon
Mr. Ted Sison, SCS
The following Attachments complete this submittal:

References
Table 1 – Summary of LTCP Soil Vapor Analytical Results Figure 1 – Site Vicinity Map
Figure 2 – Site Plan Showing LTCP Soil Vapor Analytical Results Appendix A – Soil Vapor Probe Construction Diagram
Appendix B – Field Logs
Appendix C – Laboratory Analytical Report
7 REFERENCES
American Petroleum Institute (API), 1998, Assessing the Significance of Subsurface Vapor Migration to Enclosed Spaces, December.

Department of Toxic Substances Control (DTSC) 2011, Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (Vapor Intrusion Guidance, VIG), updated October.

DTSC Johnson & Ettinger, 2014, Soil Gas Screen Model, VLOOKUP, Loam soil type.

Millington and Quirk, 1961, Permeability of Porous Solids, Trans. Faraday Soc., (57), 1200-1207.

Mr. Jacob Madden
January 8, 2020

Page 8 ends

Tom Peargin and Ravi Kolhatkar. 2011. Empirical Data Supporting Groundwater Benzene Concentration Exclusion Criteria for Petroleum Vapor Intrusion Investigations. June.

Regional Water Quality Control Board, San Francisco Bay Region (RWQCB), 2019, User’s Guide:

Derivation and Application of Environmental Screening Levels (ESLs), Interim Final, updated February 2016 and revised May 2016 and January 14.
https://www.itrcweb.org/DNAPL-ISC_tools
San Mateo County Health Services Agency, Groundwater Protection Program (GPP), 2014, Letter, Former Unocal Station (Chevron #306441) at 192 El Camino Real, South San Francisco, California, August 21.

GPP, 2018a, Letter, Former Unocal Station (Chevron #306441) at 192 El Camino Real, South San Francisco, California, August 16.

GPP, 2018b, Work Plan Approval Letter, Former Unocal Station #6980 (Chevron #306441) At 192 El Camino Real, South San Francisco, California, December 6.

SCS Engineers (SCS), 2018a, Revised Remedial Action Plan (RAP) Completion Report, 190-192 El Camino Real, South San Francisco, California, June 18.

SCS, 2018b, Work Plan, Soil Vapor Assessment, Chevron 306441/Former Unocal No. 6980, 190- 192 El Camino Real, South San Francisco, California, SMCO Case #550098, November 14.

SCS, 2019, Summary Letter Soil Vapor Assessment, Chevron 306441/Former Unocal No. 6980, 190- 192 El Camino Real, South San Francisco, California, SMCO Case #550098, September 9.

Stantec Consulting Services, Inc. (Stantec), 2014, Revised Remedial Action Plan, Chevron 306441, (Former Unocal No. 6980), 190-192 El Camino Real, South San Francisco, California, San Mateo County Case No. 550098, July 8.

State Water Resources Control Board (SWRCB), 2012, Low-Threat Underground Storage Tank Case Closure Policy (LTCP), August 17.

URS, 2007, Final Report of Natural Attenuation Characteristics and Soil Vapor Characteristics Above Dissolved-Phase Benzene Plume, Pacific Coast Pipeline (PCPL) Superfund Site, Fillmore, California.

United States Environmental Protection Agency (USEPA), 2018, Regional Screening Level (RSL) Chemicals Specific Parameters Supporting Table, May.

Washington Model Toxics Control Act (MTCA), 2007, 173-340-747, Equation 747-2 Default foc, October
Electronic Mail (Email) Correspondence:

SCS, March 26, 2019, Email to Jacob Madden proposing second vapor sampling event.

GPP, March 27, 2019, Email from Jacob Madden approving proposed second vapor sampling event. 1 90 - 192 El Camino Real
South San Francisco, CA

T A B L E
3/14/19 ND<640 ND<880 ND<2,100 ND<0.050 2.8 ND<0.004 0.094 5/7/19 ND<800 ND<1,100 ND<2,600 ND<0.050 1.2 ND<0.004 0.0077 9/25/19 7.0 140 ND<21 0.095 2.0 0.0099 0.00032
3/14/19 ND<1.6 ND<2.2 ND<5.3 ND<0.050 18 0.047 ND<0.00020 5/7/19 5,400 9,500 ND<13,000 ND<0.050 2.2 0.012 1.6
9/25/19 1,800 ND<1,100 ND<2,600 ND<0.050 1.1 0.073 0.34 3/14/19 1,300 2,300 ND<2,100 ND<0.050 5.3 0.013 1.2
5/7/19 ND<8,000 ND<11,000 ND<26,000 ND<0.050 1.6 0.035 2.1 9/25/19 ND<1,300 ND<1,800 ND<4,200 ND<0.050 1.1 0.28 0.833/14/19 ND<640 ND<880 ND<2,100 0.73 4.0 0.0042 1.8 5/7/19 ND<800 ND<1,100 ND<2,600 ND<0.050 1.4 0.0044 2.3 9/25/19 ND<64 ND<88 ND<210 ND<0.050 1.1 0.026 0.12
3/14/19 ND<32 ND<44 ND<110 ND<0.050 1.9 7.3 0.0065
5/7/19 ND<800 ND<1,100 ND<2,600 ND<0.050 1.4 12 0.051
9/25/19 3.8 64 ND<5.3 ND<0.050 1.3 13 0.0042
3/14/19 ND<32 ND<44 ND<110 0.56 4.4 70.68
5/7/19 ND<64 ND<88 ND<210 ND<0.050 2.2 17 0.84
9/25/19 ND<110 ND<150 ND<350 0.097 3.7 24 0.76
280,000 3,600,000 310,000 NE > 4.0 NE NE
Notes:Low-Threat* or LTCP = Low-Threat Underground Storage Tank Case Closure Policy, Waterboard 2012; Soil Gas Criteria with Bioattenuation Zone.µg/m3 = micrograms per cubic meter Analysis of Total Petroleum Hydrocarbons as Gasoline (TPHg) and Volatile Organic Compounds (VOCs) by Method TO15 and Light Gases by ASTM D 1946-90. See attached laboratory analytical reports for full suite of detected analytes.TPHg reported in March at 65,000 to 16,000,000 µg/m3, in May at 310,000 to 31,000,000 µg/m3, and in September at 19,000 to 24,000,000 µg/m3. NE = Not Established.NA = Not Analyzed.Bold = Does Not Meet LTCP Scenario 4 CriteriaND<3.0 = Not Detected at or above noted laboratory reporting limit.SV-10, SV-13, and SV-14 samples diluted due to high orgainc content on 3/14/19.SV-10, SV-12, SV-13, SV-14, and SV-16 samples diluted due to high orgainc content on 5/7/19.SV-10, SV-11, SV-12, SV-13, and SV-16 samples diluted due to high orgainc content on 9/25/19.Limited detection of other VOCs and Light Gases including carbon disulfide, cyclohexane, ethane, ethyltoluene, heptane, hexane, propene, sytrene, toluene, trimethylbenzene, and xylenes. See laboratory analytical reports for analytical results.

Low-Threat*
Table 1
Summary of LTCP Soil Vapor Sample Analytical Results
190 - 192 El Camino Real, South San Francisco, California Gases
%
Napthalene
LTCP Ccnstituents
Methane Sample
Name
Sample
Date
Benzene Ethylbenzene Helium Oxygen
SV-14SV-16
Carbon Dioxide
SV-10SV-11SV-12SV-13
190 - 192 El Camino Real
South San Francisco, CA

FIGURES
7041 Koll Center Parkway,
Suite 135
Pleasanton, CA 94566
Ph: (925) 426-0080
Fax: (925) 426-0707

SITE VICINITY MAP
Source: Google Earth Pro 2011
PROJECT NO: 01217233.00
DESIGNED BY: TMS SCALE: None
DRAWN BY: TMS DATE: 10/2017 FILE: Figure 1.dwg
APPROVED BY: JR
190 El Camino Real
South San Francisco, California CHECKED BY: TMS
Environmental Consultants
And Contractors
*
Site Location
Figure 1
South Spruce
Avenue
I 380
Project Site
Huntington Avenue
102356701048901 14 0,0 20345689100124 8901012456 170809 2345607FORMER PRODUCT TRENCH 8091012345 160789 SV-2 A1C2 MW-1 SVE-2S OBS-3 MW-3RA 0.1 1000 PROPOSED BUILDING-B FOOTPRINT BUILDING-A FOOTPRINT MW-10 135.86' SV-9B62 S3V- HA-1 SV-7 MW-83R1 MW-97 B1SW3 A2C2(21) SB-1 P1-12(SW1) P2(SW3) P2(12)4SW3) P(23-3 MW-23 OBS-4 MW-10RA SSV-2 MW-3R 0.1 100MW-10 157.87' 97.39' 106.19' 129.11' 170.85' PROPOSED BUILDING-B FOOTPRINT SB-63W C2(21) P2FORMER PRODUCT TRENCH P4(SW3) PROPOSED BUILDING-A FOOTPRINT P3-3 SV-92B MW-2 SV-3 HA-1 MW-1 SV-7 MW-8 OBS-3 MW-1R93A MW-7 B1A2C2 SB-1 P1-12(SW1) 0.1 10 P2(SW3) P2(12)4SW2) 10MW-3 0.1 SVE-2S OBS-4 1.0 MW-10 0.1 MW-1RA 100 SSV-2 157.87' 135.86' 106.19' 129.11' 0.1 100 97.39' 10.85' FORMER PRODUCT TRENCH POPOSED BUILDING-B FOOTPRINT (APPROX.) PROPOSED BUILDING-A FOOTPRINT SV-9B37 MW-81R9 MW-7 C2(21) P1-12(SW3) MW-231 OBS-4 MW-103RA MW-1 10234567010234567809101234 0,0 10234567809101234 8091012345 16078902345678091012345 160789 40261203 70SV-2E-2S OBS-3 FORMER USTs PROPOSED BUILDING-B FOOTPRINT (APPROX.) PROPOSED BUILDING-A FOOTPRINT SV-937 MW-897 OBS-4 MW-10RA SV-2685 SVE-2S OBS-321 SVE-1D REVISED RAP SPECIFIED EXCAVATION FOOTPRINT (APPROX.) MW-3RA PROJECT GRID EL CAMINO REAL PROPOSED BUILDING-B FOOTPRINT (APPROX.) PROPOSED BUILDING-A FOOTPRINT 10234567010234567809101234 0,0 10234567809101234 8091012345 16078902345678091012345 160789 FORMER USTs PROJECT GRID EL CAMINO REAL REVISED RAP SPECIFIED EXCAVATION BOUNDARIES TEST PIT (TP-4) TP-1237 TP-465 SOUTH SPRUCE AVENUE LEGEND SV-1120 SV-1345 SV-1612 SV-1034 SV-156 PROPOSED BUILDING-B FOOTPRINT BUILDING-A FOOTPRINT 10234567010234567809101234 0,0 10234567809101234 8091012345 16078902345678091012345 160789 FORMER USTs PROJECT GRID SV-1120 SV-1345 SV-16 FORMER USTs Soil Vapor Probe Location Non Detect At or Above Reporting Limit NDAS-BUILT EXCAVATION PERIMETER (APPROX.) 20 FOOT DEEP EXCAVATION RAP SPECIFIED EXCAVATION PERIMETER EXCAVATION EXPANSION AREA EL CAMINO REAL SOUTH EX SOUTH NOR AS-BUILT EXCAVATION PERIMETER 20 FOOT DEEP EXCAVATION PERIMETER RAP SPECIFIED EXCAVATION PERIMETER EXCAVATION EXPANSION AREA EL CAMINO REAL Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<441,100 ND<32800 1.9%4 ND<1102,600 Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<8801,100 ND<64080 2.8% 12 ND<2,100 ND<2,600 SV-10 ug/m³ Micrograms Per Cubic Meter Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<441,100 ND<32800 1.9 %4% ND<1102,600 SV-14 Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 2,300 ND<11,000 1,300 ND<8,000 5.3% 16 ND<2,100 ND<26,000 SV-12 Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<8801,100 ND<64080 4.0% 14 ND<2,100 ND<2,600 SV-13 Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<4488 ND<3264 4.4% 22 ND<1102 SV-16 Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<2.2 9,500 ND<1.6 5,400 18% 2.2% ND<5.313,000 SV-114 9/25/19 140 7.0 2% ND<211,100 1,800.1% ND<2,600 ND<1501 3.7% ND<35088 ND<64 1.1% ND<2101,800 ND<1,300 ND<4,200 643.8 13% ND<5.3 PROPOSED BUILDING-B FOOTPRINT (APPROX.) PROPOSED BUILDING-A FOOTPRINT 10234567010234567809101234 0,0 10234567809101234 8091012345 16078902345678091012345 160789 FORMER USTs AS-BUILT EXCAVATION PERIMETER (APPROX.) 20 FOOT DEEP EXCAVATION RAP SPECIFIED EXCAVATION PERIMETER EXCAVATION EXPANSION AREA PROJECT GRID AS BUILT SURVEY POINTS EL CAMINO REAL NABCDEFGNHIJKDEEP EXCAVATION SIDEWALL CONFIRMATION SOIL SAMPLE (3)456 SOUTH EX SOUTH NOR LEGEND 5 FOOT DEEP EXCAVATION SIDE-WALL CONFIRMATION SOIL SAMPLE LOCATION 10 FOOT DEEP EXCAVATION SIDEWALL 20 FOOT DEEP EXCAVATION SIDE-WALL (NOT LAB ANALYZED) 20 FOOT DEEP EXCAVATION BOTTOM NLAOT LABORATORY ANALYZED (N160 W70, 5) (N130 W90, 5) (N100 W100, 5) (N70 W90, 5) (N40 W50, 5) (N35 W35, 5) (N65 W35, 5) (N95 W70, 5) SV-1120 SV-1345 SV-16 102356701048901 14 0,0 20345689100124 8901012456 170809 2345607FORMER PRODUCT TRENCH 8091012345 160789 SV-2 A1C2 MW-1 SVE-2S OBS-3 MW-3RA 0.1 1000 PROPOSED BUILDING-B FOOTPRINT BUILDING-A FOOTPRINT MW-10 135.86' SV-9B62 S3V- HA-1 SV-7 MW-83R1 MW-97 B1SW3 A2C2(21) SB-1 P1-12(SW1) P2(SW3) P2(12)4SW3) P(23-3 MW-23 OBS-4 MW-10RA SSV-2 MW-3R 0.1 100MW-10 157.87' 97.39' 106.19' 129.11' 170.85' PROPOSED BUILDING-B FOOTPRINT SB-63W C2(21) P2FORMER PRODUCT TRENCH P4(SW3) PROPOSED BUILDING-A FOOTPRINT P3-3 SV-92B MW-2 SV-3 HA-1 MW-1 SV-7 MW-8 OBS-3 MW-1R93A MW-7 B1A2C2 SB-1 P1-12(SW1) 0.1 10 P2(SW3) P2(12)4SW2) 10MW-3 0.1 SVE-2S OBS-4 1.0 MW-10 0.1 MW-1RA 100 SSV-2 157.87' 135.86' 106.19' 129.11' 0.1 100 97.39' 10.85' FORMER PRODUCT TRENCH POPOSED BUILDING-B FOOTPRINT (APPROX.) PROPOSED BUILDING-A FOOTPRINT SV-9B37 MW-81R9 MW-7 C2(21) P1-12(SW3) MW-231 OBS-4 MW-103RA MW-1 10234567010234567809101234 0,0 10234567809101234 8091012345 16078902345678091012345 160789 40261203 70SV-2E-2S OBS-3 FORMER USTs PROPOSED BUILDING-B FOOTPRINT (APPROX.) PROPOSED BUILDING-A FOOTPRINT SV-937 MW-897 OBS-4 MW-10RA SV-2685 SVE-2S OBS-321 SVE-1D REVISED RAP SPECIFIED EXCAVATION FOOTPRINT (APPROX.) MW-3RA PROJECT GRID EL CAMINO REAL PROPOSED BUILDING-B FOOTPRINT (APPROX.) PROPOSED BUILDING-A FOOTPRINT 10234567010234567809101234 0,0 10234567809101234 8091012345 16078902345678091012345 160789 FORMER USTs PROJECT GRID EL CAMINO REAL REVISED RAP SPECIFIED EXCAVATION BOUNDARIES TEST PIT (TP-4) TP-1237 TP-465 SOUTH SPRUCE AVENUE LEGEND SV-1120 SV-1345 SV-1612 SV-1034 SV-156 PROPOSED BUILDING-B FOOTPRINT (APPROX.) PROPOSED BUILDING-A FOOTPRINT 10 2034567010234567809101234
0,0 10234567809101234
8091012345 160789
10234567809
1001234 1506789 FORMER USTs AS-BUILT EXCAVATION PERIMETER (APPROX.) 20 FOOT DEEP EXCAVATION PERIMETER (APPROX.) RAP SPECIFIED EXCAVATION PERIMETER EXCAVATION EXPANSION AREAPROJECT GRID AS BUILT SURVEY POINTS EL CAMINO REAL NABCDEFGNHIJKDEEP EXCAVATION SIDEWALL CONFIRMATION SOIL SAMPLE(3)456 SOUTH EX SOUTH NOR LEGEND 5 FOOT DEEP EXCAVATION SIDE-WALL CONFIRMATION SOIL SAMPLE LOCATION 10 FOOT DEEP EXCAVATION SIDEWALL CONFIRMATION SOIL SAMPLE LOCATION 20 FOOT DEEP EXCAVATION SIDE-WALL (NOT LAB ANALYZED) 20 FOOT DEEP EXCAVATION BOTTOM NLAOT LABORATORY ANALYZED (N160 W70, 5) (N130 W90, 5) (N100 W100, 5)(N70 W90, 5) (N40 W50, 5) (N35 W35, 5) (N65 W35, 5) (N95 W70, 5) SV-1120 SV-13 SV-145 PROPOSED BUILDING-B FOOTPRINT BUILDING-A FOOTPRINT 10234567010234567809101234 0,0 10234567809101234 8091012345 16078902345678091012345 160789 FORMER USTs PROJECT GRID SV-1120 SV-1345 SV-16 FORMER USTs Soil Vapor Probe Location Non Detect At or Above Reporting Limit NDAS-BUILT EXCAVATION PERIMETER (APPROX.) 20 FOOT DEEP EXCAVATION RAP SPECIFIED EXCAVATION PERIMETER EXCAVATION EXPANSION AREA EL CAMINO REAL SOUTH EX SOUTH NOR AS-BUILT EXCAVATION PERIMETER 20 FOOT DEEP EXCAVATION PERIMETER RAP SPECIFIED EXCAVATION PERIMETER EXCAVATION EXPANSION AREA EL CAMINO REAL Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<441,100 ND<32800 1.9%4 ND<1102,600 Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<8801,100 ND<64080 2.8% 12 ND<2,100 ND<2,600 SV-10 ug/m³ Micrograms Per Cubic Meter Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<441,100 ND<32800 1.9 %4% ND<1102,600 SV-14 Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 2,300 ND<11,000 1,300 ND<8,000 5.3% 16 ND<2,100 ND<26,000 SV-12 Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<8801,100 ND<64080 4.0% 14 ND<2,100 ND<2,600 SV-13 Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<4488 ND<3264 4.4% 22 ND<1102 SV-16 Oxygen Benzene Ethylbenzene Naphthalene 3/14/19 5/7/19 ND<2.2 9,500 ND<1.6 5,400 18% 2.2% ND<5.313,000 SV-114 9/25/19 140 7.0 2% ND<211,100 1,800.1% ND<2,600 ND<1501 3.7% ND<35088 ND<64 1.1% ND<2101,800 ND<1,300 ND<4,200 643.8 13% ND<5.3 SV-16 LEGEND

PROPOSED BUILDING-B FOOTPRINT

BUILDING-A FOOTPRINT
10 20
30 40
50 60
70 0
10 20
30 40
50 60
70 80
90 100
110
120
130
140
0,0
10 20
30 40
50 60
70 80
90 100
110
120
130
140
80 90
100
110
120
130
140
150
160
170
180
190
10 20
30 40
50 60
70 80
90 100
110
120
130
140
150
160
170
180
190
FORMER
USTs

PROJECT GRID
SV-11
SV-12
SV-10
SV-13
SV-14
SV-15
SV-16
FORMER
USTs
Soil Vapor Probe Location
ND Non Detect At or Above Reporting Limit

AS-BUILT EXCAVATION PERIMETER
20 FOOT DEEP EXCAVATION PERIMETER

RAP SPECIFIED EXCAVATION PERIMETER

EXCAVATION EXPANSION AREA

EL CAMINO REAL
20 FOOT DEEP EXCAVATION PERIMETER
Oxygen Benzene Ethylbenzene Naphthalene
3/14/19
5/7/19 ND<44 ND<1,100 ND<32 ND<800

1.9%

1.4%
ND<110 ND<2,600
Oxygen Benzene Ethylbenzene Naphthalene
3/14/19
5/7/19 ND<880 ND<1,100 ND<640 ND<800

2.8%

1.2%
ND<2,100
ND<2,600
SV-10
ug/m³ Micrograms Per Cubic Meter
Oxygen Benzene Ethylbenzene Naphthalene
3/14/19
5/7/19 ND<44 ND<1,100 ND<32 ND<800

1.9 %

1.4%
ND<110 ND<2,600
SV-14
Oxygen Benzene Ethylbenzene Naphthalene
3/14/19
5/7/19
2,300
ND<11,000
1,300
ND<8,000

5.3%

1.6%
ND<2,100
ND<26,000
SV-12
Oxygen Benzene Ethylbenzene Naphthalene
3/14/19
5/7/19 ND<880 ND<1,100 ND<640 ND<800

4.0%

1.4%
ND<2,100
ND<2,600
SV-13
Oxygen Benzene Ethylbenzene Naphthalene
3/14/19
5/7/19 ND<44 ND<88 ND<32 ND<64

4.4%

2.2%
ND<110 ND<210
SV-16
Oxygen Benzene Ethylbenzene Naphthalene
3/14/19
5/7/19 ND<2.2
9,500 ND<1.6
5,400
18%

2.2%
ND<5.3 ND<13,000
SV-11
SV-14
9/25/19 2.0% 7.0 140 ND<21
9/25/19 1.1% 1,800 ND<1,100 ND<2,600
9/25/19 3.7% ND<110 ND<150 ND<350
9/25/19 1.1% ND<64 ND<88 ND<210
9/25/19 1.1% ND<1,300 ND<1,800 ND<4,200
9/25/19 1.3% 3.8 64 ND<5.3
N
0 30 60

APPROXIMATE SCALE IN FEET
1 90 - 192 El Camino Real
South San Francisco, CA

AP P EN DIX A

S O I L VA P O R PR O B E CO N S T R C U T I O N DI A G R A M 7041 KOLL CENTER PARKWAY, SUITE 135 PLEASANTON, CALIFORNIA 94566

ENVIRONMENTAL CONSULTANTS
PHONE: (925) 426-0080 FAX.: (925) 426-0707
1 90 - 192 El Camino Real
South San Francisco, CA

AP P EN DIX B

FIELD LOGS

1 90 - 192 El Camino Real
South San Francisco, CA

AP P EN DIX C

LABORATORY AN ALY TIC AL R EPOR T
WorkOrder:

Report Created for: SCS Engineers
7041 Koll Center Parkway, Suite 135
Pleasanton, CA 94566
Project Contact: Jim Ritchie
Project: Chevron
Project P.O.: 01217233.00
Project Received: 09/25/2019
Analytical Report reviewed & approved for release on 10/03/2019 by:

Jennifer Lagerbom
1909B99
The report shall not be reproduced except in full, without the written approval of the laboratory. The analytical results relate only to the items tested. Results reported conform to the most current NELAP standards, where applicable, unless otherwise stated in the case narrative.

Analytical Report
1534 Willow Pass Rd. Pittsburg, CA 94565 ♦ TEL: (877) 252-9262 ♦ FAX: (925) 252-9269 ♦ www.mccampbell.com CA ELAP 1644 ♦ NELAP 4033 ORELAP
Project Manager
McCampbell Analytical, Inc.
"When Quality Counts"

Page 1 of 43 ends

Glossary of Terms & Qualifier Definitions
Client: SCS Engineers
Project: Chevron
WorkOrder: 1909B99
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Glossary Abbreviation
%D Serial Dilution Percent Difference
95% Interval 95% Confident Interval
DF Dilution Factor
DI WET (DISTLC) Waste Extraction Test using DI water
DISS Dissolved (direct analysis of 0.45 µm filtered and acidified water sample) DLT Dilution Test (Serial Dilution)
DUP Duplicate
EDL Estimated Detection Limit
ERS External reference sample. Second source calibration verification.

ITEF International Toxicity Equivalence Factor
LCS Laboratory Control Sample
LQL Lowest Quantitation Level
MB Method Blank
MB % Rec % Recovery of Surrogate in Method Blank, if applicable MDL Method Detection Limit
ML Minimum Level of Quantitation
MS Matrix Spike
MSD Matrix Spike Duplicate
N/A Not Applicable
ND Not detected at or above the indicated MDL or RL
NR Data Not Reported due to matrix interference or insufficient sample amount.

PDS Post Digestion Spike
PDSD Post Digestion Spike Duplicate
PF Prep Factor
RD Relative Difference
RL Reporting Limit (The RL is the lowest calibration standard in a multipoint calibration.) RPD Relative Percent Deviation
RRT Relative Retention Time
SPK Val Spike Value
SPKRef Val Spike Reference Value
SPLP Synthetic Precipitation Leachate Procedure
ST Sorbent Tube
TCLP Toxicity Characteristic Leachate Procedure
TEQ Toxicity Equivalents
TZA TimeZone Net Adjustment for sample collected outside of MAI's UTC.

WET (STLC) Waste Extraction Test (Soluble Threshold Limit Concentration)

Page 2 of 43 ends

Page 3 of 43 ends

Client: SCS Engineers
Project: Chevron
Case Narrative
October 03, 2019
Work Order: 1909B99
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" j1:

TO-15 ANALYSIS
All summa canisters are EVACUATED 5 days after the reporting of the results. Please call or email if a longer retention time is required.
1909B99-001A, -002A, -003A, -005A
Cyclohexane is estimated due to coelution with another peak(s) / cluttered chromatogram.

Page 4 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/27/19
WorkOrder: 1909B99
Extraction Method: ASTM D 1946-90
Analytical Method: ASTM D 1946-90
Unit: %
Atmospheric Gases
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-10 1909B99-001A Water 09/25/2019 10:32 GC26 0927190111.D 186203 Analytes Result RL DF Date Analyzed

11.78 23.55
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Oxygen 2.0 0.40 1 09/27/2019 09:53
SV-11 1909B99-002A Water 09/25/2019 09:50 GC26 0927190113.D 186203 Analytes Result RL DF Date Analyzed

12.43 24.82
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Oxygen 1.1 0.40 1 09/27/2019 10:14
SV-12 1909B99-003A Water 09/25/2019 09:04 GC26 0927190115.D 186203 Analytes Result RL DF Date Analyzed

11.97 23.87
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Oxygen 1.1 0.40 1 09/27/2019 10:35
(Cont.)

Page 5 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/27/19
WorkOrder: 1909B99
Extraction Method: ASTM D 1946-90
Analytical Method: ASTM D 1946-90
Unit: %
Atmospheric Gases
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-13 1909B99-004A Water 09/25/2019 11:44 GC26 0927190117.D 186203 Analytes Result RL DF Date Analyzed

11.07 22.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Oxygen 1.1 0.40 1 09/27/2019 10:56
SV-14 1909B99-005A Water 09/25/2019 11:06 GC26 0927190119.D 186203 Analytes Result RL DF Date Analyzed

12.32 24.64
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Oxygen 1.3 0.40 1 09/27/2019 11:17
SV-16 1909B99-006A Water 09/25/2019 12:13 GC26 0927190121.D 186203 Analytes Result RL DF Date Analyzed

12.57 25.09
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Oxygen 3.7 0.40 1 09/27/2019 11:39

Page 6 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/26/19
WorkOrder: 1909B99
Extraction Method: ASTM D 1946-90
Analytical Method: ASTM D 1946-90
Unit: %
Helium
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-10 1909B99-001A Water 09/25/2019 10:32 GC26 0926190202.D 186128 Analytes Result RL DF Date Analyzed

11.78 23.55
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Helium 0.095 0.050 1 09/26/2019 14:46
SV-11 1909B99-002A Water 09/25/2019 09:50 GC26 0926190204.D 186128 Analytes Result RL DF Date Analyzed

12.43 24.82
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Helium ND 0.050 1 09/26/2019 14:59
SV-12 1909B99-003A Water 09/25/2019 09:04 GC26 0926190206.D 186128 Analytes Result RL DF Date Analyzed

11.97 23.87
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Helium ND 0.050 1 09/26/2019 15:12
(Cont.)

Page 7 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/26/19
WorkOrder: 1909B99
Extraction Method: ASTM D 1946-90
Analytical Method: ASTM D 1946-90
Unit: %
Helium
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-13 1909B99-004A Water 09/25/2019 11:44 GC26 0926190208.D 186128 Analytes Result RL DF Date Analyzed

11.07 22.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Helium ND 0.050 1 09/26/2019 15:25
SV-14 1909B99-005A Water 09/25/2019 11:06 GC26 0926190210.D 186128 Analytes Result RL DF Date Analyzed

12.32 24.64
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Helium ND 0.050 1 09/26/2019 15:38
SV-16 1909B99-006A Water 09/25/2019 12:13 GC26 0926190212.D 186128 Analytes Result RL DF Date Analyzed

12.57 25.09
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Helium 0.097 0.050 1 09/26/2019 15:51

Page 8 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 10/2/19-10/3/19
WorkOrder: 1909B99
Extraction Method: ASTM D 1946-90
Analytical Method: ASTM D 1946-90
Unit: %
Light Gases
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-10 1909B99-001A Water 09/25/2019 10:32 GC26 1002190101.D 186445 Analytes Result RL DF Date Analyzed

11.78 23.55
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetylene ND 0.00020 1 10/02/2019 13:10
Carbon Dioxide 0.0099 0.0040 1 10/02/2019 13:10
Ethane ND 0.00020 1 10/02/2019 13:10
Ethylene ND 0.00020 1 10/02/2019 13:10
Methane 0.00032 0.00020 1 10/02/2019 13:10
Propane ND 0.00020 1 10/02/2019 13:10
SV-11 1909B99-002A Water 09/25/2019 09:50 GC26 1002190103.D 186445 Analytes Result RL DF Date Analyzed

12.43 24.82
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetylene ND 0.00020 1 10/02/2019 13:45
Carbon Dioxide 0.073 0.0040 1 10/02/2019 13:45
Ethane 0.00039 0.00020 1 10/02/2019 13:45
Ethylene ND 0.00020 1 10/02/2019 13:45
Methane 0.34 0.00020 1 10/02/2019 13:45
Propane ND 0.00020 1 10/02/2019 13:45
(Cont.)

Page 9 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 10/2/19-10/3/19
WorkOrder: 1909B99
Extraction Method: ASTM D 1946-90
Analytical Method: ASTM D 1946-90
Unit: %
Light Gases
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-12 1909B99-003A Water 09/25/2019 09:04 GC26 1002190105.D 186445 Analytes Result RL DF Date Analyzed

11.97 23.87
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetylene ND 0.00020 1 10/02/2019 14:19
Carbon Dioxide 0.28 0.0040 1 10/02/2019 14:19
Ethane 0.00076 0.00020 1 10/02/2019 14:19
Ethylene ND 0.00020 1 10/02/2019 14:19
Methane 0.83 0.00020 1 10/02/2019 14:19
Propane ND 0.00020 1 10/02/2019 14:19
SV-13 1909B99-004A Water 09/25/2019 11:44 GC26 1002190107.D 186445 Analytes Result RL DF Date Analyzed

11.07 22.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetylene ND 0.00020 1 10/02/2019 14:54
Carbon Dioxide 0.026 0.0040 1 10/02/2019 14:54
Ethane ND 0.00020 1 10/02/2019 14:54
Ethylene ND 0.00020 1 10/02/2019 14:54
Methane 0.12 0.00020 1 10/02/2019 14:54
Propane ND 0.00020 1 10/02/2019 14:54
(Cont.)

Page 10 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 10/2/19-10/3/19
WorkOrder: 1909B99
Extraction Method: ASTM D 1946-90
Analytical Method: ASTM D 1946-90
Unit: %
Light Gases
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-14 1909B99-005A Water 09/25/2019 11:06 GC26 1002190109.D 186445 Analytes Result RL DF Date Analyzed

12.32 24.64
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetylene ND 0.00020 1 10/02/2019 15:29
Carbon Dioxide 13 0.16 40 10/03/2019 10:28
Ethane ND 0.00020 1 10/02/2019 15:29
Ethylene ND 0.00020 1 10/02/2019 15:29
Methane 0.0042 0.00020 1 10/02/2019 15:29
Propane ND 0.00020 1 10/02/2019 15:29
SV-16 1909B99-006A Water 09/25/2019 12:13 GC26 1002190111.D 186445 Analytes Result RL DF Date Analyzed

12.57 25.09
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetylene ND 0.00020 1 10/02/2019 16:03
Carbon Dioxide 24 0.16 40 10/03/2019 11:03
Ethane ND 0.00020 1 10/02/2019 16:03
Ethylene ND 0.00020 1 10/02/2019 16:03
Methane 0.76 0.00020 1 10/02/2019 16:03
Propane ND 0.00020 1 10/02/2019 16:03

Page 11 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
TPH gas
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-10 1909B99-001A Water 09/25/2019 10:32 GC24 09271923.D 186294 Analytes Result RL DF Date Analyzed

11.78 23.55
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
TPH(g) 38,000 2900 4 09/28/2019 05:10
Surrogates REC (%) Limits
1,2-DCA-d4 96 70-130 09/28/2019 05:10
SV-11 1909B99-002A Water 09/25/2019 09:50 GC24 09271929.D 186294 Analytes Result RL DF Date Analyzed

12.43 24.82
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
TPH(g) 28,000,000 720,000 1000 09/28/2019 09:09
Surrogates REC (%) Limits
1,2-DCA-d4 110 70-130 09/28/2019 09:09
SV-12 1909B99-003A Water 09/25/2019 09:04 GC24 09271933.D 186294 Analytes Result RL DF Date Analyzed

11.97 23.87
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
TPH(g) 24,000,000 580,000 800 09/28/2019 11:48
Surrogates REC (%) Limits
1,2-DCA-d4 106 70-130 09/28/2019 11:48
(Cont.)

Page 12 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
TPH gas
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-13 1909B99-004A Water 09/25/2019 11:44 GC24 09271925.D 186294 Analytes Result RL DF Date Analyzed

11.07 22.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
TPH(g) 680,000 29,000 40 09/28/2019 06:30
Surrogates REC (%) Limits
1,2-DCA-d4 112 70-130 09/28/2019 06:30
SV-14 1909B99-005A Water 09/25/2019 11:06 GC24 09271921.D 186294 Analytes Result RL DF Date Analyzed

12.32 24.64
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
TPH(g) 19,000 720 1 09/28/2019 03:51
Surrogates REC (%) Limits
1,2-DCA-d4 109 70-130 09/28/2019 03:51
SV-16 1909B99-006A Water 09/25/2019 12:13 GC24 09271927.D 186294 Analytes Result RL DF Date Analyzed

12.57 25.09
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
TPH(g) 230,000 48,000 66.7 09/28/2019 07:49
Surrogates REC (%) Limits
1,2-DCA-d4 94 70-130 09/28/2019 07:49

Page 13 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-10 1909B99-001A Water 09/25/2019 10:32 GC24 09271923.D 186294 Analytes Result RL DF Date Analyzed

11.78 23.55
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetone ND 240 4 09/28/2019 05:10
Acrolein ND 23 4 09/28/2019 05:10
Acrylonitrile ND 4.4 4 09/28/2019 05:10
tert-Amyl methyl ether (TAME) ND 8.4 4 09/28/2019 05:10 Benzene 7.0 6.4 4 09/28/2019 05:10
Benzyl chloride ND 11 4 09/28/2019 05:10
Bromodichloromethane ND 14 4 09/28/2019 05:10
Bromoform ND 21 4 09/28/2019 05:10
Bromomethane ND 7.8 4 09/28/2019 05:10
1,3-Butadiene ND 4.4 4 09/28/2019 05:10
2-Butanone (MEK) ND 300 4 09/28/2019 05:10
t-Butyl alcohol (TBA) ND 120 4 09/28/2019 05:10
Carbon Disulfide 16 6.4 4 09/28/2019 05:10
Carbon Tetrachloride ND 13 4 09/28/2019 05:10
Chlorobenzene ND 9.4 4 09/28/2019 05:10
Chloroethane ND 5.4 4 09/28/2019 05:10
Chloroform ND 9.8 4 09/28/2019 05:10
Chloromethane ND 4.2 4 09/28/2019 05:10
Cyclohexane 290 70 4 09/28/2019 05:10
Dibromochloromethane ND 17 4 09/28/2019 05:10
1,2-Dibromo-3-chloropropane ND 0.49 4 09/28/2019 05:10
1,2-Dibromoethane (EDB) ND 16 4 09/28/2019 05:10
1,2-Dichlorobenzene ND 12 4 09/28/2019 05:10
1,3-Dichlorobenzene ND 12 4 09/28/2019 05:10
1,4-Dichlorobenzene ND 12 4 09/28/2019 05:10
Dichlorodifluoromethane ND 10 4 09/28/2019 05:10
1,1-Dichloroethane ND 8.2 4 09/28/2019 05:10
1,2-Dichloroethane (1,2-DCA) ND 8.2 4 09/28/2019 05:10
1,1-Dichloroethene ND 8.0 4 09/28/2019 05:10
cis-1,2-Dichloroethene ND 8.0 4 09/28/2019 05:10
trans-1,2-Dichloroethene ND 8.0 4 09/28/2019 05:10
1,2-Dichloropropane ND 9.4 4 09/28/2019 05:10
cis-1,3-Dichloropropene ND 9.2 4 09/28/2019 05:10
(Cont.)

Page 14 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-10 1909B99-001A Water 09/25/2019 10:32 GC24 09271923.D 186294 Analytes Result RL DF Date Analyzed

11.78 23.55
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
trans-1,3-Dichloropropene ND 9.2 4 09/28/2019 05:10
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 14 4 09/28/2019 05:10 Diisopropyl ether (DIPE) ND 8.4 4 09/28/2019 05:10
1,4-Dioxane ND 7.4 4 09/28/2019 05:10
Ethanol ND 380 4 09/28/2019 05:10
Ethyl acetate ND 7.4 4 09/28/2019 05:10
Ethyl tert-butyl ether (ETBE) ND 8.4 4 09/28/2019 05:10 Ethylbenzene 140 8.8 4 09/28/2019 05:10
4-Ethyltoluene 150 10 4 09/28/2019 05:10
Freon 113 ND 16 4 09/28/2019 05:10
Heptane ND 84 4 09/28/2019 05:10
Hexachlorobutadiene ND 22 4 09/28/2019 05:10
Hexane ND 72 4 09/28/2019 05:10
2-Hexanone ND 8.4 4 09/28/2019 05:10
4-Methyl-2-pentanone (MIBK) ND 8.4 4 09/28/2019 05:10
Methyl-t-butyl ether (MTBE) ND 7.4 4 09/28/2019 05:10
Methylene chloride ND 35 4 09/28/2019 05:10
Methyl methacrylate ND 8.3 4 09/28/2019 05:10
Naphthalene ND 21 4 09/28/2019 05:10
Styrene ND 8.6 4 09/28/2019 05:10
1,1,1,2-Tetrachloroethane ND 14 4 09/28/2019 05:10
1,1,2,2-Tetrachloroethane ND 14 4 09/28/2019 05:10
Tetrachloroethene ND 14 4 09/28/2019 05:10
Tetrahydrofuran ND 12 4 09/28/2019 05:10
Toluene ND 7.6 4 09/28/2019 05:10
1,2,4-Trichlorobenzene ND 15 4 09/28/2019 05:10
1,1,1-Trichloroethane ND 11 4 09/28/2019 05:10
1,1,2-Trichloroethane ND 11 4 09/28/2019 05:10
Trichloroethene ND 11 4 09/28/2019 05:10
Trichlorofluoromethane ND 11 4 09/28/2019 05:10
1,2,4-Trimethylbenzene 490 10 4 09/28/2019 05:10
1,3,5-Trimethylbenzene 350 10 4 09/28/2019 05:10
Vinyl Acetate ND 72 4 09/28/2019 05:10
(Cont.)

Page 15 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-10 1909B99-001A Water 09/25/2019 10:32 GC24 09271923.D 186294 Analytes Result RL DF Date Analyzed

11.78 23.55
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Vinyl Chloride ND 5.2 4 09/28/2019 05:10
m,p-Xylene 110 18 4 09/28/2019 05:10
o-Xylene 90 8.8 4 09/28/2019 05:10
Xylenes, Total 200 8.8 4 09/28/2019 05:10
1,3-Dichloropropene, Total ND 9.2 4 09/28/2019 05:10
Surrogates REC (%) Limits
Analytical Comments: j1
1,2-DCA-d4 99 70-130 09/28/2019 05:10
Toluene-d8 101 70-130 09/28/2019 05:10
4-BFB 100 70-130 09/28/2019 05:10
(Cont.)

Page 16 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-11 1909B99-002A Water 09/25/2019 09:50 GC24 09271930.D 186294 Analytes Result RL DF Date Analyzed

12.43 24.82
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetone ND 30,000 500 09/28/2019 09:49
Acrolein ND 2900 500 09/28/2019 09:49
Acrylonitrile ND 550 500 09/28/2019 09:49
tert-Amyl methyl ether (TAME) ND 1000 500 09/28/2019 09:49 Benzene 1800 800 500 09/28/2019 09:49
Benzyl chloride ND 1300 500 09/28/2019 09:49
Bromodichloromethane ND 1800 500 09/28/2019 09:49
Bromoform ND 2600 500 09/28/2019 09:49
Bromomethane ND 980 500 09/28/2019 09:49
1,3-Butadiene ND 550 500 09/28/2019 09:49
2-Butanone (MEK) ND 38,000 500 09/28/2019 09:49
t-Butyl alcohol (TBA) ND 16,000 500 09/28/2019 09:49
Carbon Disulfide ND 800 500 09/28/2019 09:49
Carbon Tetrachloride ND 1600 500 09/28/2019 09:49
Chlorobenzene ND 1200 500 09/28/2019 09:49
Chloroethane ND 670 500 09/28/2019 09:49
Chloroform ND 1200 500 09/28/2019 09:49
Chloromethane ND 520 500 09/28/2019 09:49
Cyclohexane 570,000 18,000 1000 09/28/2019 09:09
Dibromochloromethane ND 2200 500 09/28/2019 09:49
1,2-Dibromo-3-chloropropane ND 62 500 09/28/2019 09:49
1,2-Dibromoethane (EDB) ND 2000 500 09/28/2019 09:49
1,2-Dichlorobenzene ND 1500 500 09/28/2019 09:49
1,3-Dichlorobenzene ND 1500 500 09/28/2019 09:49
1,4-Dichlorobenzene ND 1500 500 09/28/2019 09:49
Dichlorodifluoromethane ND 1200 500 09/28/2019 09:49
1,1-Dichloroethane ND 1000 500 09/28/2019 09:49
1,2-Dichloroethane (1,2-DCA) ND 1000 500 09/28/2019 09:49 1,1-Dichloroethene ND 1000 500 09/28/2019 09:49
cis-1,2-Dichloroethene ND 1000 500 09/28/2019 09:49
trans-1,2-Dichloroethene ND 1000 500 09/28/2019 09:49
1,2-Dichloropropane ND 1200 500 09/28/2019 09:49
cis-1,3-Dichloropropene ND 1200 500 09/28/2019 09:49
(Cont.)

Page 17 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-11 1909B99-002A Water 09/25/2019 09:50 GC24 09271930.D 186294 Analytes Result RL DF Date Analyzed

12.43 24.82
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
trans-1,3-Dichloropropene ND 1200 500 09/28/2019 09:49
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 1800 500 09/28/2019 09:49 Diisopropyl ether (DIPE) ND 1000 500 09/28/2019 09:49
1,4-Dioxane ND 920 500 09/28/2019 09:49
Ethanol ND 48,000 500 09/28/2019 09:49
Ethyl acetate ND 920 500 09/28/2019 09:49
Ethyl tert-butyl ether (ETBE) ND 1000 500 09/28/2019 09:49 Ethylbenzene ND 1100 500 09/28/2019 09:49
4-Ethyltoluene 1800 1200 500 09/28/2019 09:49
Freon 113 ND 2000 500 09/28/2019 09:49
Heptane 35,000 10,000 500 09/28/2019 09:49
Hexachlorobutadiene ND 2700 500 09/28/2019 09:49
Hexane 50,000 9000 500 09/28/2019 09:49
2-Hexanone ND 1000 500 09/28/2019 09:49
4-Methyl-2-pentanone (MIBK) ND 1000 500 09/28/2019 09:49 Methyl-t-butyl ether (MTBE) ND 920 500 09/28/2019 09:49 Methylene chloride ND 4400 500 09/28/2019 09:49
Methyl methacrylate ND 1000 500 09/28/2019 09:49
Naphthalene ND 2600 500 09/28/2019 09:49
Styrene ND 1100 500 09/28/2019 09:49
1,1,1,2-Tetrachloroethane ND 1800 500 09/28/2019 09:49
1,1,2,2-Tetrachloroethane ND 1800 500 09/28/2019 09:49
Tetrachloroethene ND 1700 500 09/28/2019 09:49
Tetrahydrofuran ND 1500 500 09/28/2019 09:49
Toluene ND 950 500 09/28/2019 09:49
1,2,4-Trichlorobenzene ND 1900 500 09/28/2019 09:49
1,1,1-Trichloroethane ND 1400 500 09/28/2019 09:49
1,1,2-Trichloroethane ND 1400 500 09/28/2019 09:49
Trichloroethene ND 1400 500 09/28/2019 09:49
Trichlorofluoromethane ND 1400 500 09/28/2019 09:49
1,2,4-Trimethylbenzene 3900 1200 500 09/28/2019 09:49
1,3,5-Trimethylbenzene 4000 1200 500 09/28/2019 09:49
Vinyl Acetate ND 9000 500 09/28/2019 09:49
(Cont.)

Page 18 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-11 1909B99-002A Water 09/25/2019 09:50 GC24 09271930.D 186294 Analytes Result RL DF Date Analyzed

12.43 24.82
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Vinyl Chloride ND 650 500 09/28/2019 09:49
m,p-Xylene ND 2200 500 09/28/2019 09:49
o-Xylene 2600 1100 500 09/28/2019 09:49
Xylenes, Total 2600 1100 500 09/28/2019 09:49
1,3-Dichloropropene, Total ND 1200 500 09/28/2019 09:49 Surrogates REC (%) Limits
Analytical Comments: j1
1,2-DCA-d4 119 70-130 09/28/2019 09:49
Toluene-d8 98 70-130 09/28/2019 09:49
4-BFB 96 70-130 09/28/2019 09:49
(Cont.)

Page 19 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-12 1909B99-003A Water 09/25/2019 09:04 GC24 09271933.D 186294 Analytes Result RL DF Date Analyzed

11.97 23.87
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetone ND 48,000 800 09/28/2019 11:48
Acrolein ND 4700 800 09/28/2019 11:48
Acrylonitrile ND 880 800 09/28/2019 11:48
tert-Amyl methyl ether (TAME) ND 1700 800 09/28/2019 11:48 Benzene ND 1300 800 09/28/2019 11:48
Benzyl chloride ND 2100 800 09/28/2019 11:48
Bromodichloromethane ND 2800 800 09/28/2019 11:48
Bromoform ND 4200 800 09/28/2019 11:48
Bromomethane ND 1600 800 09/28/2019 11:48
1,3-Butadiene ND 880 800 09/28/2019 11:48
2-Butanone (MEK) ND 60,000 800 09/28/2019 11:48
t-Butyl alcohol (TBA) ND 25,000 800 09/28/2019 11:48
Carbon Disulfide ND 1300 800 09/28/2019 11:48
Carbon Tetrachloride ND 2600 800 09/28/2019 11:48
Chlorobenzene ND 1900 800 09/28/2019 11:48
Chloroethane ND 1100 800 09/28/2019 11:48
Chloroform ND 2000 800 09/28/2019 11:48
Chloromethane ND 840 800 09/28/2019 11:48
Cyclohexane 410,000 14,000 800 09/28/2019 11:48
Dibromochloromethane ND 3500 800 09/28/2019 11:48
1,2-Dibromo-3-chloropropane ND 98 800 09/28/2019 11:48
1,2-Dibromoethane (EDB) ND 3100 800 09/28/2019 11:48
1,2-Dichlorobenzene ND 2400 800 09/28/2019 11:48
1,3-Dichlorobenzene ND 2400 800 09/28/2019 11:48
1,4-Dichlorobenzene ND 2400 800 09/28/2019 11:48
Dichlorodifluoromethane ND 2000 800 09/28/2019 11:48
1,1-Dichloroethane ND 1600 800 09/28/2019 11:48
1,2-Dichloroethane (1,2-DCA) ND 1600 800 09/28/2019 11:48 1,1-Dichloroethene ND 1600 800 09/28/2019 11:48
cis-1,2-Dichloroethene ND 1600 800 09/28/2019 11:48
trans-1,2-Dichloroethene ND 1600 800 09/28/2019 11:48
1,2-Dichloropropane ND 1900 800 09/28/2019 11:48
cis-1,3-Dichloropropene ND 1800 800 09/28/2019 11:48
(Cont.)

Page 20 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-12 1909B99-003A Water 09/25/2019 09:04 GC24 09271933.D 186294 Analytes Result RL DF Date Analyzed

11.97 23.87
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
trans-1,3-Dichloropropene ND 1800 800 09/28/2019 11:48
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 2800 800 09/28/2019 11:48 Diisopropyl ether (DIPE) ND 1700 800 09/28/2019 11:48
1,4-Dioxane ND 1500 800 09/28/2019 11:48
Ethanol ND 77,000 800 09/28/2019 11:48
Ethyl acetate ND 1500 800 09/28/2019 11:48
Ethyl tert-butyl ether (ETBE) ND 1700 800 09/28/2019 11:48 Ethylbenzene ND 1800 800 09/28/2019 11:48
4-Ethyltoluene ND 2000 800 09/28/2019 11:48
Freon 113 ND 3100 800 09/28/2019 11:48
Heptane 34,000 17,000 800 09/28/2019 11:48
Hexachlorobutadiene ND 4300 800 09/28/2019 11:48
Hexane 45,000 14,000 800 09/28/2019 11:48
2-Hexanone ND 1700 800 09/28/2019 11:48
4-Methyl-2-pentanone (MIBK) ND 1700 800 09/28/2019 11:48 Methyl-t-butyl ether (MTBE) ND 1500 800 09/28/2019 11:48 Methylene chloride ND 7100 800 09/28/2019 11:48
Methyl methacrylate ND 1700 800 09/28/2019 11:48
Naphthalene ND 4200 800 09/28/2019 11:48
Styrene ND 1700 800 09/28/2019 11:48
1,1,1,2-Tetrachloroethane ND 2800 800 09/28/2019 11:48
1,1,2,2-Tetrachloroethane ND 2800 800 09/28/2019 11:48
Tetrachloroethene ND 2800 800 09/28/2019 11:48
Tetrahydrofuran ND 2400 800 09/28/2019 11:48
Toluene ND 1500 800 09/28/2019 11:48
1,2,4-Trichlorobenzene ND 3000 800 09/28/2019 11:48
1,1,1-Trichloroethane ND 2200 800 09/28/2019 11:48
1,1,2-Trichloroethane ND 2200 800 09/28/2019 11:48
Trichloroethene ND 2200 800 09/28/2019 11:48
Trichlorofluoromethane ND 2300 800 09/28/2019 11:48
1,2,4-Trimethylbenzene ND 2000 800 09/28/2019 11:48
1,3,5-Trimethylbenzene ND 2000 800 09/28/2019 11:48
Vinyl Acetate ND 14,000 800 09/28/2019 11:48
(Cont.)

Page 21 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-12 1909B99-003A Water 09/25/2019 09:04 GC24 09271933.D 186294 Analytes Result RL DF Date Analyzed

11.97 23.87
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Vinyl Chloride ND 1000 800 09/28/2019 11:48
m,p-Xylene ND 3500 800 09/28/2019 11:48
o-Xylene ND 1800 800 09/28/2019 11:48
Xylenes, Total ND 1800 800 09/28/2019 11:48
1,3-Dichloropropene, Total ND 1800 800 09/28/2019 11:48 Surrogates REC (%) Limits
Analytical Comments: j1
1,2-DCA-d4 111 70-130 09/28/2019 11:48
Toluene-d8 98 70-130 09/28/2019 11:48
4-BFB 92 70-130 09/28/2019 11:48
(Cont.)

Page 22 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-13 1909B99-004A Water 09/25/2019 11:44 GC24 09271925.D 186294 Analytes Result RL DF Date Analyzed

11.07 22.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetone ND 2400 40 09/28/2019 06:30
Acrolein ND 230 40 09/28/2019 06:30
Acrylonitrile ND 44 40 09/28/2019 06:30
tert-Amyl methyl ether (TAME) ND 84 40 09/28/2019 06:30 Benzene ND 64 40 09/28/2019 06:30
Benzyl chloride ND 110 40 09/28/2019 06:30
Bromodichloromethane ND 140 40 09/28/2019 06:30
Bromoform ND 210 40 09/28/2019 06:30
Bromomethane ND 78 40 09/28/2019 06:30
1,3-Butadiene ND 44 40 09/28/2019 06:30
2-Butanone (MEK) ND 3000 40 09/28/2019 06:30
t-Butyl alcohol (TBA) ND 1200 40 09/28/2019 06:30
Carbon Disulfide ND 64 40 09/28/2019 06:30
Carbon Tetrachloride ND 130 40 09/28/2019 06:30
Chlorobenzene ND 94 40 09/28/2019 06:30
Chloroethane ND 54 40 09/28/2019 06:30
Chloroform ND 98 40 09/28/2019 06:30
Chloromethane ND 42 40 09/28/2019 06:30
Cyclohexane ND 700 40 09/28/2019 06:30
Dibromochloromethane ND 170 40 09/28/2019 06:30
1,2-Dibromo-3-chloropropane ND 4.9 40 09/28/2019 06:30
1,2-Dibromoethane (EDB) ND 160 40 09/28/2019 06:30
1,2-Dichlorobenzene ND 120 40 09/28/2019 06:30
1,3-Dichlorobenzene ND 120 40 09/28/2019 06:30
1,4-Dichlorobenzene ND 120 40 09/28/2019 06:30
Dichlorodifluoromethane ND 100 40 09/28/2019 06:30
1,1-Dichloroethane ND 82 40 09/28/2019 06:30
1,2-Dichloroethane (1,2-DCA) ND 82 40 09/28/2019 06:30
1,1-Dichloroethene ND 80 40 09/28/2019 06:30
cis-1,2-Dichloroethene ND 80 40 09/28/2019 06:30
trans-1,2-Dichloroethene ND 80 40 09/28/2019 06:30
1,2-Dichloropropane ND 94 40 09/28/2019 06:30
cis-1,3-Dichloropropene ND 92 40 09/28/2019 06:30
(Cont.)

Page 23 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-13 1909B99-004A Water 09/25/2019 11:44 GC24 09271925.D 186294 Analytes Result RL DF Date Analyzed

11.07 22.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
trans-1,3-Dichloropropene ND 92 40 09/28/2019 06:30
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 140 40 09/28/2019 06:30 Diisopropyl ether (DIPE) ND 84 40 09/28/2019 06:30
1,4-Dioxane ND 74 40 09/28/2019 06:30
Ethanol ND 3800 40 09/28/2019 06:30
Ethyl acetate ND 74 40 09/28/2019 06:30
Ethyl tert-butyl ether (ETBE) ND 84 40 09/28/2019 06:30 Ethylbenzene ND 88 40 09/28/2019 06:30
4-Ethyltoluene ND 100 40 09/28/2019 06:30
Freon 113 ND 160 40 09/28/2019 06:30
Heptane ND 840 40 09/28/2019 06:30
Hexachlorobutadiene ND 220 40 09/28/2019 06:30
Hexane ND 720 40 09/28/2019 06:30
2-Hexanone ND 84 40 09/28/2019 06:30
4-Methyl-2-pentanone (MIBK) ND 84 40 09/28/2019 06:30
Methyl-t-butyl ether (MTBE) ND 74 40 09/28/2019 06:30
Methylene chloride ND 350 40 09/28/2019 06:30
Methyl methacrylate ND 83 40 09/28/2019 06:30
Naphthalene ND 210 40 09/28/2019 06:30
Styrene ND 86 40 09/28/2019 06:30
1,1,1,2-Tetrachloroethane ND 140 40 09/28/2019 06:30
1,1,2,2-Tetrachloroethane ND 140 40 09/28/2019 06:30
Tetrachloroethene ND 140 40 09/28/2019 06:30
Tetrahydrofuran ND 120 40 09/28/2019 06:30
Toluene ND 76 40 09/28/2019 06:30
1,2,4-Trichlorobenzene ND 150 40 09/28/2019 06:30
1,1,1-Trichloroethane ND 110 40 09/28/2019 06:30
1,1,2-Trichloroethane ND 110 40 09/28/2019 06:30
Trichloroethene ND 110 40 09/28/2019 06:30
Trichlorofluoromethane ND 110 40 09/28/2019 06:30
1,2,4-Trimethylbenzene 240 100 40 09/28/2019 06:30
1,3,5-Trimethylbenzene 150 100 40 09/28/2019 06:30
Vinyl Acetate ND 720 40 09/28/2019 06:30
(Cont.)

Page 24 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-13 1909B99-004A Water 09/25/2019 11:44 GC24 09271925.D 186294 Analytes Result RL DF Date Analyzed

11.07 22.11
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Vinyl Chloride ND 52 40 09/28/2019 06:30
m,p-Xylene ND 180 40 09/28/2019 06:30
o-Xylene ND 88 40 09/28/2019 06:30
Xylenes, Total ND 88 40 09/28/2019 06:30
1,3-Dichloropropene, Total ND 92 40 09/28/2019 06:30
Surrogates REC (%) Limits
Analytical Comments: j1
1,2-DCA-d4 118 70-130 09/28/2019 06:30
Toluene-d8 100 70-130 09/28/2019 06:30
4-BFB 95 70-130 09/28/2019 06:30
(Cont.)

Page 25 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-14 1909B99-005A Water 09/25/2019 11:06 GC24 09271921.D 186294 Analytes Result RL DF Date Analyzed

12.32 24.64
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetone ND 60 1 09/28/2019 03:51
Acrolein ND 5.8 1 09/28/2019 03:51
Acrylonitrile ND 1.1 1 09/28/2019 03:51
tert-Amyl methyl ether (TAME) ND 2.1 1 09/28/2019 03:51 Benzene 3.8 1.6 1 09/28/2019 03:51
Benzyl chloride ND 2.6 1 09/28/2019 03:51
Bromodichloromethane ND 3.5 1 09/28/2019 03:51
Bromoform ND 5.2 1 09/28/2019 03:51
Bromomethane ND 2.0 1 09/28/2019 03:51
1,3-Butadiene ND 1.1 1 09/28/2019 03:51
2-Butanone (MEK) ND 75 1 09/28/2019 03:51
t-Butyl alcohol (TBA) ND 31 1 09/28/2019 03:51
Carbon Disulfide 7.9 1.6 1 09/28/2019 03:51
Carbon Tetrachloride ND 3.2 1 09/28/2019 03:51
Chlorobenzene ND 2.4 1 09/28/2019 03:51
Chloroethane ND 1.3 1 09/28/2019 03:51
Chloroform ND 2.4 1 09/28/2019 03:51
Chloromethane ND 1.0 1 09/28/2019 03:51
Cyclohexane 240 18 1 09/28/2019 03:51
Dibromochloromethane ND 4.4 1 09/28/2019 03:51
1,2-Dibromo-3-chloropropane ND 0.12 1 09/28/2019 03:51
1,2-Dibromoethane (EDB) ND 3.9 1 09/28/2019 03:51
1,2-Dichlorobenzene ND 3.0 1 09/28/2019 03:51
1,3-Dichlorobenzene ND 3.0 1 09/28/2019 03:51
1,4-Dichlorobenzene ND 3.0 1 09/28/2019 03:51
Dichlorodifluoromethane ND 2.5 1 09/28/2019 03:51
1,1-Dichloroethane ND 2.0 1 09/28/2019 03:51
1,2-Dichloroethane (1,2-DCA) ND 2.0 1 09/28/2019 03:51
1,1-Dichloroethene ND 2.0 1 09/28/2019 03:51
cis-1,2-Dichloroethene ND 2.0 1 09/28/2019 03:51
trans-1,2-Dichloroethene ND 2.0 1 09/28/2019 03:51
1,2-Dichloropropane ND 2.4 1 09/28/2019 03:51
cis-1,3-Dichloropropene ND 2.3 1 09/28/2019 03:51
(Cont.)

Page 26 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-14 1909B99-005A Water 09/25/2019 11:06 GC24 09271921.D 186294 Analytes Result RL DF Date Analyzed

12.32 24.64
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
trans-1,3-Dichloropropene ND 2.3 1 09/28/2019 03:51
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 3.6 1 09/28/2019 03:51 Diisopropyl ether (DIPE) ND 2.1 1 09/28/2019 03:51
1,4-Dioxane ND 1.8 1 09/28/2019 03:51
Ethanol ND 96 1 09/28/2019 03:51
Ethyl acetate ND 1.8 1 09/28/2019 03:51
Ethyl tert-butyl ether (ETBE) ND 2.1 1 09/28/2019 03:51 Ethylbenzene 64 2.2 1 09/28/2019 03:51
4-Ethyltoluene 70 2.5 1 09/28/2019 03:51
Freon 113 ND 3.9 1 09/28/2019 03:51
Heptane 24 21 1 09/28/2019 03:51
Hexachlorobutadiene ND 5.4 1 09/28/2019 03:51
Hexane ND 18 1 09/28/2019 03:51
2-Hexanone ND 2.1 1 09/28/2019 03:51
4-Methyl-2-pentanone (MIBK) ND 2.1 1 09/28/2019 03:51
Methyl-t-butyl ether (MTBE) ND 1.8 1 09/28/2019 03:51
Methylene chloride ND 8.8 1 09/28/2019 03:51
Methyl methacrylate ND 2.1 1 09/28/2019 03:51
Naphthalene ND 5.3 1 09/28/2019 03:51
Styrene ND 2.2 1 09/28/2019 03:51
1,1,1,2-Tetrachloroethane ND 3.5 1 09/28/2019 03:51
1,1,2,2-Tetrachloroethane ND 3.5 1 09/28/2019 03:51
Tetrachloroethene ND 3.4 1 09/28/2019 03:51
Tetrahydrofuran ND 3.0 1 09/28/2019 03:51
Toluene ND 1.9 1 09/28/2019 03:51
1,2,4-Trichlorobenzene ND 3.8 1 09/28/2019 03:51
1,1,1-Trichloroethane ND 2.8 1 09/28/2019 03:51
1,1,2-Trichloroethane ND 2.8 1 09/28/2019 03:51
Trichloroethene ND 2.8 1 09/28/2019 03:51
Trichlorofluoromethane ND 2.8 1 09/28/2019 03:51
1,2,4-Trimethylbenzene 240 2.5 1 09/28/2019 03:51
1,3,5-Trimethylbenzene 150 2.5 1 09/28/2019 03:51
Vinyl Acetate ND 18 1 09/28/2019 03:51
(Cont.)

Page 27 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-14 1909B99-005A Water 09/25/2019 11:06 GC24 09271921.D 186294 Analytes Result RL DF Date Analyzed

12.32 24.64
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Vinyl Chloride ND 1.3 1 09/28/2019 03:51
m,p-Xylene 52 4.4 1 09/28/2019 03:51
o-Xylene 41 2.2 1 09/28/2019 03:51
Xylenes, Total 93 2.2 1 09/28/2019 03:51
1,3-Dichloropropene, Total ND 2.3 1 09/28/2019 03:51
Surrogates REC (%) Limits
Analytical Comments: j1
1,2-DCA-d4 114 70-130 09/28/2019 03:51
Toluene-d8 101 70-130 09/28/2019 03:51
4-BFB 111 70-130 09/28/2019 03:51
(Cont.)

Page 28 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-16 1909B99-006A Water 09/25/2019 12:13 GC24 09271927.D 186294 Analytes Result RL DF Date Analyzed

12.57 25.09
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Acetone ND 4000 66.7 09/28/2019 07:49
Acrolein ND 390 66.7 09/28/2019 07:49
Acrylonitrile ND 73 66.7 09/28/2019 07:49
tert-Amyl methyl ether (TAME) ND 140 66.7 09/28/2019 07:49 Benzene ND 110 66.7 09/28/2019 07:49
Benzyl chloride ND 180 66.7 09/28/2019 07:49
Bromodichloromethane ND 230 66.7 09/28/2019 07:49
Bromoform ND 350 66.7 09/28/2019 07:49
Bromomethane ND 130 66.7 09/28/2019 07:49
1,3-Butadiene ND 73 66.7 09/28/2019 07:49
2-Butanone (MEK) ND 5000 66.7 09/28/2019 07:49
t-Butyl alcohol (TBA) ND 2100 66.7 09/28/2019 07:49
Carbon Disulfide ND 110 66.7 09/28/2019 07:49
Carbon Tetrachloride ND 210 66.7 09/28/2019 07:49
Chlorobenzene ND 160 66.7 09/28/2019 07:49
Chloroethane ND 89 66.7 09/28/2019 07:49
Chloroform ND 160 66.7 09/28/2019 07:49
Chloromethane ND 70 66.7 09/28/2019 07:49
Cyclohexane ND 1200 66.7 09/28/2019 07:49
Dibromochloromethane ND 290 66.7 09/28/2019 07:49
1,2-Dibromo-3-chloropropane ND 8.2 66.7 09/28/2019 07:49 1,2-Dibromoethane (EDB) ND 260 66.7 09/28/2019 07:49
1,2-Dichlorobenzene ND 200 66.7 09/28/2019 07:49
1,3-Dichlorobenzene ND 200 66.7 09/28/2019 07:49
1,4-Dichlorobenzene ND 200 66.7 09/28/2019 07:49
Dichlorodifluoromethane ND 170 66.7 09/28/2019 07:49
1,1-Dichloroethane ND 140 66.7 09/28/2019 07:49
1,2-Dichloroethane (1,2-DCA) ND 140 66.7 09/28/2019 07:49 1,1-Dichloroethene ND 130 66.7 09/28/2019 07:49
cis-1,2-Dichloroethene ND 130 66.7 09/28/2019 07:49
trans-1,2-Dichloroethene ND 130 66.7 09/28/2019 07:49
1,2-Dichloropropane ND 160 66.7 09/28/2019 07:49
cis-1,3-Dichloropropene ND 150 66.7 09/28/2019 07:49
(Cont.)

Page 29 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-16 1909B99-006A Water 09/25/2019 12:13 GC24 09271927.D 186294 Analytes Result RL DF Date Analyzed

12.57 25.09
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
trans-1,3-Dichloropropene ND 150 66.7 09/28/2019 07:49
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 240 66.7 09/28/2019 07:49 Diisopropyl ether (DIPE) ND 140 66.7 09/28/2019 07:49
1,4-Dioxane ND 120 66.7 09/28/2019 07:49
Ethanol ND 6400 66.7 09/28/2019 07:49
Ethyl acetate ND 120 66.7 09/28/2019 07:49
Ethyl tert-butyl ether (ETBE) ND 140 66.7 09/28/2019 07:49 Ethylbenzene ND 150 66.7 09/28/2019 07:49
4-Ethyltoluene ND 170 66.7 09/28/2019 07:49
Freon 113 ND 260 66.7 09/28/2019 07:49
Heptane ND 1400 66.7 09/28/2019 07:49
Hexachlorobutadiene ND 360 66.7 09/28/2019 07:49
Hexane ND 1200 66.7 09/28/2019 07:49
2-Hexanone ND 140 66.7 09/28/2019 07:49
4-Methyl-2-pentanone (MIBK) ND 140 66.7 09/28/2019 07:49 Methyl-t-butyl ether (MTBE) ND 120 66.7 09/28/2019 07:49 Methylene chloride ND 590 66.7 09/28/2019 07:49
Methyl methacrylate ND 140 66.7 09/28/2019 07:49
Naphthalene ND 350 66.7 09/28/2019 07:49
Styrene ND 140 66.7 09/28/2019 07:49
1,1,1,2-Tetrachloroethane ND 230 66.7 09/28/2019 07:49
1,1,2,2-Tetrachloroethane ND 230 66.7 09/28/2019 07:49
Tetrachloroethene ND 230 66.7 09/28/2019 07:49
Tetrahydrofuran ND 200 66.7 09/28/2019 07:49
Toluene ND 130 66.7 09/28/2019 07:49
1,2,4-Trichlorobenzene ND 250 66.7 09/28/2019 07:49
1,1,1-Trichloroethane ND 180 66.7 09/28/2019 07:49
1,1,2-Trichloroethane ND 180 66.7 09/28/2019 07:49
Trichloroethene ND 180 66.7 09/28/2019 07:49
Trichlorofluoromethane ND 190 66.7 09/28/2019 07:49
1,2,4-Trimethylbenzene 170 170 66.7 09/28/2019 07:49
1,3,5-Trimethylbenzene ND 170 66.7 09/28/2019 07:49
Vinyl Acetate ND 1200 66.7 09/28/2019 07:49
(Cont.)

Page 30 of 43 ends

Analytical Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Received: 9/25/19 15:17
Date Prepared: 9/28/19
WorkOrder: 1909B99
Extraction Method: TO15
Analytical Method: TO15
Unit: µg/m³
Volatile Organic Compounds
Client ID Lab ID Matrix Date Collected Instrument Batch ID SV-16 1909B99-006A Water 09/25/2019 12:13 GC24 09271927.D 186294 Analytes Result RL DF Date Analyzed

12.57 25.09
Initial Pressure (psia) Final Pressure (psia) Analyst(s) HK
Vinyl Chloride ND 87 66.7 09/28/2019 07:49
m,p-Xylene ND 290 66.7 09/28/2019 07:49
o-Xylene ND 150 66.7 09/28/2019 07:49
Xylenes, Total ND 150 66.7 09/28/2019 07:49
1,3-Dichloropropene, Total ND 150 66.7 09/28/2019 07:49 Surrogates REC (%) Limits
Analytical Comments: j1
1,2-DCA-d4 97 70-130 09/28/2019 07:49
Toluene-d8 100 70-130 09/28/2019 07:49
4-BFB 95 70-130 09/28/2019 07:49

Page 31 of 43 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Analyzed: 9/27/19
Date Prepared: 9/27/19
WorkOrder: 1909B99
BatchID: 186203
Analytical Method: ASTM D 1946-90
Unit: %
Sample ID: MB/LCS/LCSD-186203
Instrument: GC26
Matrix: SoilGas
Extraction Method: ASTM D 1946-90
QC Summary Report for ASTM D1946-90
Analyte MB
Result
MDL RL
Oxygen ND 0.014 0.20 - - -
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
Oxygen 1.8 1.8 2.1 86 85 70-130 1.01 20

Page 32 of 43 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Analyzed: 9/26/19
Date Prepared: 9/26/19
WorkOrder: 1909B99
BatchID: 186128
Analytical Method: ASTM D 1946-90
Unit: %
Sample ID: MB/LCS/LCSD-186128
Instrument: GC26
Matrix: Soilgas
Extraction Method: ASTM D 1946-90
QC Summary Report for ASTM D1946-90
Analyte MB
Result
MDL RL
Helium ND 0.025 0.025 - - -
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
Helium 0.084 0.084 0.10 84 84 60-140 0 20

Page 33 of 43 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Analyzed: 10/2/19
Date Prepared: 10/2/19
WorkOrder: 1909B99
BatchID: 186445
Analytical Method: ASTM D 1946-90
Unit: %
Sample ID: MB/LCS/LCSD-186445
Instrument: GC26
Matrix: SoilGas
Extraction Method: ASTM D 1946-90
QC Summary Report for ASTM D1946-90
Analyte MB
Result
MDL RL
Acetylene ND 0.0000011 0.00010 - - -
Carbon Dioxide ND 0.000085 0.0020 - - -
Ethane ND 0.000030 0.00010 - - -
Ethylene ND 0.00010 0.00010 - - -
Methane ND 0.000030 0.00010 - - -
Propane 0.000017,J 0.0000023 0.00010 - - -
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
Acetylene 0.0094 0.0094 0.010 94 94 70-130 0 20
Carbon Dioxide 0.010 0.010 0.010 104 100 70-130 3.63 20 Ethane 0.011 0.011 0.010 114 114 70-130 0 20
Ethylene 0.0082 0.0082 0.010 82 82 70-130 0 20
Methane 0.0080 0.0081 0.010 80 81 70-130 0.0595 20
Propane 0.0098 0.0098 0.010 98 98 70-130 0 20

Page 34 of 43 ends

MDL RL SPK
Val
MB SS
%REC
MB SS
Limits
TPH(g) ND 360 360 - - -
Surrogate Recovery
1,2-DCA-d4 470 500 94 70-130
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
TPH(g) 9700 9300 9000 108 104 70-130 3.51 20
Surrogate Recovery
1,2-DCA-d4 480 480 500 96 96 60-140 0 30

Page 35 of 43 ends

MDL RL SPK
Val
MB SS
%REC
MB SS
Limits
Acetone ND 2.6 30 - - -
Acrolein ND 0.28 2.9 - - -
Acrylonitrile ND 0.14 0.55 - - -
tert-Amyl methyl ether (TAME) ND 0.55 1.0 - - -
Benzene ND 0.16 0.80 - - -
Benzyl chloride ND 0.15 1.3 - - -
Bromodichloromethane ND 0.0095 1.8 - - -
Bromoform ND 0.43 2.6 - - -
Bromomethane ND 0.40 1.0 - - -
1,3-Butadiene ND 0.12 0.55 - - -
2-Butanone (MEK) ND 2.6 38 - - -
t-Butyl alcohol (TBA) ND 14 16 - - -
Carbon Disulfide ND 0.11 0.80 - - -
Carbon Tetrachloride ND 0.0065 1.6 - - -
Chlorobenzene ND 0.16 1.2 - - -
Chloroethane ND 0.24 0.65 - - -
Chloroform ND 0.0095 1.2 - - -
Chloromethane ND 0.065 0.50 - - -
Cyclohexane ND 0.35 9.0 - - -
Dibromochloromethane ND 0.012 2.2 - - -
1,2-Dibromo-3-chloropropane ND 0.018 0.060 - - -
1,2-Dibromoethane (EDB) ND 0.26 2.0 - - -
1,2-Dichlorobenzene ND 0.25 1.5 - - -
1,3-Dichlorobenzene ND 0.25 1.5 - - -
1,4-Dichlorobenzene ND 0.20 1.5 - - -
Dichlorodifluoromethane ND 0.12 1.2 - - -
1,1-Dichloroethane ND 0.36 1.0 - - -
1,2-Dichloroethane (1,2-DCA) ND 0.080 1.0 - - -
1,1-Dichloroethene ND 0.19 1.0 - - -
cis-1,2-Dichloroethene ND 0.15 1.0 - - -
trans-1,2-Dichloroethene ND 0.15 1.0 - - -
1,2-Dichloropropane ND 0.0085 1.2 - - -
cis-1,3-Dichloropropene ND 0.011 1.2 - - -
trans-1,3-Dichloropropene ND 0.23 1.2 - - -
1,2-Dichloro-1,1,2,2-tetrafluoroethane ND 1.8 1.8 - - - Diisopropyl ether (DIPE) ND 0.085 1.0 - - -
1,4-Dioxane ND 0.15 0.90 - - -
Ethanol ND 2.9 48 - - -
(Cont.)

Page 36 of 43 ends

MDL RL SPK
Val
MB SS
%REC
MB SS
Limits
Ethyl acetate ND 0.11 0.90 - - -
Ethyl tert-butyl ether (ETBE) ND 0.34 1.0 - - -
Ethylbenzene ND 0.13 1.1 - - -
4-Ethyltoluene ND 0.090 1.2 - - -
Freon 113 ND 0.30 2.0 - - -
Heptane ND 0.075 10 - - -
Hexachlorobutadiene ND 0.19 2.7 - - -
Hexane ND 0.12 9.0 - - -
2-Hexanone ND 0.21 1.0 - - -
Isopropyl Alcohol ND 2.9 25 - - -
4-Methyl-2-pentanone (MIBK) ND 0.10 1.0 - - -
Methyl-t-butyl ether (MTBE) ND 0.21 0.90 - - -
Methylene chloride ND 0.34 4.4 - - -
Methyl methacrylate ND 0.10 1.0 - - -
Naphthalene ND 0.30 2.6 - - -
Styrene ND 0.11 1.1 - - -
1,1,1,2-Tetrachloroethane 0.0064,J 0.0050 1.8 - - -
1,1,2,2-Tetrachloroethane ND 0.016 1.8 - - -
Tetrachloroethene ND 0.0095 1.7 - - -
Tetrahydrofuran ND 0.080 1.5 - - -
Toluene ND 0.12 0.95 - - -
1,2,4-Trichlorobenzene ND 0.25 1.9 - - -
1,1,1-Trichloroethane ND 0.25 1.4 - - -
1,1,2-Trichloroethane ND 0.0070 1.4 - - -
Trichloroethene ND 0.014 1.4 - - -
Trichlorofluoromethane ND 0.21 1.4 - - -
1,2,4-Trimethylbenzene ND 1.2 1.2 - - -
1,3,5-Trimethylbenzene ND 0.15 1.2 - - -
Vinyl Acetate ND 0.30 9.0 - - -
Vinyl Chloride ND 0.090 0.65 - - -
m,p-Xylene ND 0.13 2.2 - - -
o-Xylene ND 0.090 1.1 - - -
Surrogate Recovery
1,2-DCA-d4 490 500 97 70-130
Toluene-d8 490 500 97 70-130
4-BFB 470 500 94 70-130
(Cont.)

Page 37 of 43 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Analyzed: 9/27/19 - 9/28/19
Date Prepared: 9/27/19 - 9/28/19
WorkOrder: 1909B99
BatchID: 186294
Analytical Method: TO15
Unit: µg/m³
Sample ID: MB/LCS/LCSD-186294
Instrument: GC24
Matrix: SoilGas
Extraction Method: TO15
QC Summary Report for TO15
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
Acetone 5.9 6.0 6 98 100 60-140 2.23 30
Acrolein 5.3 5.3 5.8 91 91 60-140 0 30
Acrylonitrile 5.3 5.0 5.5 96 90 60-140 6.16 30
tert-Amyl methyl ether (TAME) 10 10 10.5 97 97 60-140 0 30 Benzene 7.1 7.1 8 89 89 60-140 0 30
Benzyl chloride 12 12 13.3 94 93 60-140 0.482 30
Bromodichloromethane 18 17 17.5 101 98 60-140 2.53 30
Bromoform 25 25 26.3 95 95 60-140 0 30
Bromomethane 9.5 9.5 9.8 97 97 60-140 0 30
1,3-Butadiene 5.6 5.8 5.5 102 106 60-140 3.38 30
2-Butanone (MEK) 7.1 7.0 7.5 95 94 60-140 0.715 30
t-Butyl alcohol (TBA) 7.0 7.1 7.8 90 91 60-140 1.81 30
Carbon Disulfide 6.5 7.2 8 82 90 60-140 9.82 30
Carbon Tetrachloride 16 16 16 99 99 60-140 0 30
Chlorobenzene 12 12 11.8 101 101 60-140 0 30
Chloroethane 6.4 6.5 6.8 95 95 60-140 0 30
Chloroform 11 11 12.3 93 93 60-140 0 30
Chloromethane 4.5 4.5 5.3 86 85 60-140 1.12 30
Cyclohexane 8.6 8.6 8.8 98 98 60-140 0 30
Dibromochloromethane 22 22 21.8 100 99 60-140 0.935 30
1,2-Dibromo-3-chloropropane 24 24 24.5 98 98 60-140 0 30 1,2-Dibromoethane (EDB) 20 20 19.5 104 104 60-140 0 30
1,2-Dichlorobenzene 14 14 15.3 91 90 60-140 1.54 30
1,3-Dichlorobenzene 14 14 15.3 93 94 60-140 0.282 30
1,4-Dichlorobenzene 16 16 15.3 104 105 60-140 0.429 30
Dichlorodifluoromethane 12 12 12.5 93 93 60-140 0 30
1,1-Dichloroethane 9.9 9.9 10.3 96 96 60-140 0 30
1,2-Dichloroethane (1,2-DCA) 8.9 8.9 10.3 86 87 60-140 0.486 30 1,1-Dichloroethene 8.8 8.8 10 88 88 60-140 0 30
cis-1,2-Dichloroethene 9.5 9.7 10 95 97 60-140 2.10 30
trans-1,2-Dichloroethene 9.6 9.7 10 96 97 60-140 1.41 30 1,2-Dichloropropane 11 11 11.8 91 90 60-140 0.260 30
cis-1,3-Dichloropropene 12 12 11.5 101 100 60-140 1.10 30 trans-1,3-Dichloropropene 11 11 11.5 98 97 60-140 0.823 30 1,2-Dichloro-1,1,2,2-tetrafluoroethane 16 16 17.8 92 91 60-140 1.76 30 Diisopropyl ether (DIPE) 10 10 10.5 95 96 60-140 0.326 30 1,4-Dioxane 9.1 9.2 9.3 98 99 60-140 1.10 30
Ethanol 4.4 4.5 4.8 92 93 60-140 0.849 30
(Cont.)

Page 38 of 43 ends

Quality Control Report
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client: SCS Engineers
Project: Chevron
Date Analyzed: 9/27/19 - 9/28/19
Date Prepared: 9/27/19 - 9/28/19
WorkOrder: 1909B99
BatchID: 186294
Analytical Method: TO15
Unit: µg/m³
Sample ID: MB/LCS/LCSD-186294
Instrument: GC24
Matrix: SoilGas
Extraction Method: TO15
QC Summary Report for TO15
Analyte LCS
Result
LCSD
Result
SPK
Val
LCS
%REC
LCSD
%REC

LCS/LCSD
Limits

RPD RPD
Limit
Ethyl acetate 8.9 9.0 9.3 95 97 60-140 1.98 30
Ethyl tert-butyl ether (ETBE) 10 10 10.5 97 98 60-140 0.909 30 Ethylbenzene 11 11 11 96 96 60-140 0 30
4-Ethyltoluene 12 12 12.5 97 98 60-140 1.33 30
Freon 113 19 19 19.5 96 97 60-140 0.987 30
Heptane 10 10 10.5 99 100 60-140 0.741 30
Hexachlorobutadiene 26 26 27 95 96 60-140 0.434 30
Hexane 9.5 9.8 9 106 108 60-140 2.37 30
2-Hexanone 11 11 10.5 104 104 60-140 0 30
Isopropyl Alcohol 5.9 5.9 6.3 94 93 60-140 0.625 30
4-Methyl-2-pentanone (MIBK) 10 10 10.5 100 99 60-140 1.18 30 Methyl-t-butyl ether (MTBE) 8.7 8.7 9.3 93 94 60-140 0.666 30 Methylene chloride 8.8 8.7 8.8 100 99 60-140 0.810 30
Methyl methacrylate 10 10 10.4 97 98 60-140 0.646 30
Naphthalene 11 11 13.25 80 81 60-140 1.37 30
Styrene 10 10 10.8 96 94 60-140 1.30 30
1,1,1,2-Tetrachloroethane 19 18 17.5 106 106 60-140 0 30 1,1,2,2-Tetrachloroethane 18 18 17.5 104 103 60-140 0.864 30 Tetrachloroethene 18 17 17.2 102 101 60-140 1.11 30
Tetrahydrofuran 7.2 7.4 7.5 97 99 60-140 2.26 30
Toluene 9.1 8.9 9.5 96 93 60-140 2.55 30
1,2,4-Trichlorobenzene 16 16 18.8 84 85 60-140 0.242 30 1,1,1-Trichloroethane 13 13 13.8 95 96 60-140 1.11 30
1,1,2-Trichloroethane 14 14 13.8 99 99 60-140 0 30
Trichloroethene 13 13 13.8 94 95 60-140 1.28 30
Trichlorofluoromethane 14 14 14.3 96 97 60-140 1.01 30
1,2,4-Trimethylbenzene 12 12 12.5 94 94 60-140 0 30
1,3,5-Trimethylbenzene 13 13 12.5 102 100 60-140 1.24 30 Vinyl Acetate 9.0 8.8 9 100 98 60-140 1.63 30
Vinyl Chloride 5.5 5.5 6.5 84 84 60-140 0 30
m,p-Xylene 22 22 22 100 98 60-140 2.31 30
o-Xylene 11 10 11 96 95 60-140 0.830 30
Surrogate Recovery
1,2-DCA-d4 490 490 500 98 99 70-130 0.746 30
Toluene-d8 510 500 500 102 101 70-130 1.69 30
4-BFB 500 500 500 101 100 70-130 0.377 30

Page 39 of 43 ends

McCampbell Analytical, Inc.
1534 Willow Pass Rd
Pittsburg, CA 94565-1701
(925) 252-9262
CHAIN-OF-CUSTODY RECORD Page
Lab ID Matrix Collection Date Hold
Requested Tests (See legend below)
Report to:

Jim Ritchie
7041 Koll Center Parkway, Suite 135
Pleasanton, CA 94566
(925) 426-0080 FAX: (925) 240-5629
PO: 01217233.00
09/25/2019
Client ID
Project: Chevron
WorkOrder: 1909B99
1 of 1
Date Logged:

Date Received: 09/25/2019
1 2 3 4 5 6 7 8 9 10 11 12
SCS Engineers
Bill to:

Accounts Payable
SCS Engineers
7041 Koll Center Parkway, Suite 135
Pleasanton, CA 94566
Requested TAT: 5 days;
ClientCode: SCSD
Email: [email protected]; mgrisham@sc
EDF EQuIS Email HardCopy ThirdParty
[email protected]
WriteOn Excel J-flag
cc/3rd Party:

WaterTrax
Detection Summary Dry-Weight
1909B99-001 SV-10 Water 9/25/2019 10:32 A A A A A A
1909B99-002 SV-11 Water 9/25/2019 09:50 A A A A A
1909B99-003 SV-12 Water 9/25/2019 09:04 A A A A A
1909B99-004 SV-13 Water 9/25/2019 11:44 A A A A A
1909B99-005 SV-14 Water 9/25/2019 11:06 A A A A A
1909B99-006 SV-16 Water 9/25/2019 12:13 A A A A A
1909B99-007 UNUSED SUMMA SoilGas <Not Provided> A A
1909B99-008 UNUSED SUMMA SoilGas <Not Provided> A A
Prepared by: Julia Danielsson
NOTE: Soil samples are discarded 60 days after results are reported unless other arrangements are made (Water samples are 30 days).

Hazardous samples will be returned to client or disposed of at client expense.

Comments:

ATMOSPHERICGAS_SG(%) HELIUM_LC_SOILGAS(%) LG_SUMMA_SOILGAS(%) PREDD_Excel PRUNUSEDSUMMA TO15_Scan-SIM_SOIL(UG/M3) [N] TO15GAS_Scan-SIM_SOIL(UG/M3) 1 2 3 4
5 6 7 8
9 10
Test Legend:

UNUSED_SUMMA
11 12
The following SampIDs: 001A, 002A, 003A, 004A, 005A, 006A contain testgroup TO15He_gas_O2_CO2_Ch4_SG.

Project Manager: Angela Rydelius

Page 40 of 43 ends

Lab ID Client ID Collection Date
& Time
Date Logged:

Matrix Test Name Containers TAT
/Composites

WORK ORDER SUMMARY
Work Order: 1909B99
Comments:

Client Name: SCS ENGINEERS Project: Chevron
QC Level:

De- Hold
chlorinated
Bottle & Preservative SubOut
9/25/2019
Sediment
Content
WriteOn EDF Excel EQuIS Email HardCopy ThirdParty J-flag Client Contact: Jim Ritchie
Contact's Email: [email protected]; [email protected] WaterTrax
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" 1909B99-001A SV-10 Water TO15+GAS w/ Helium, O2, CO2 and 9/25/2019 10:32 5 days Methane
1 1L Summa
1909B99-002A SV-11 Water TO15+GAS w/ Helium, O2, CO2 and 9/25/2019 9:50 5 days Methane
1 1L Summa
1909B99-003A SV-12 Water TO15+GAS w/ Helium, O2, CO2 and 9/25/2019 9:04 5 days Methane
1 1L Summa
1909B99-004A SV-13 Water TO15+GAS w/ Helium, O2, CO2 and 9/25/2019 11:44 5 days Methane
1 1L Summa
1909B99-005A SV-14 Water TO15+GAS w/ Helium, O2, CO2 and 9/25/2019 11:06 5 days Methane
1 1L Summa
1909B99-006A SV-16 Water TO15+GAS w/ Helium, O2, CO2 and 9/25/2019 12:13 5 days Methane
1 1L Summa
1909B99-007A UNUSED SUMMA SoilGas Unused Summa 1 1L Summa <Not Provided> 5 days 1909B99-008A UNUSED SUMMA SoilGas Unused Summa 1 1L Summa <Not Provided> 5 days

Page 1 of 1 ends

- STLC and TCLP extractions require 2 days to complete; therefore, all TATs begin after the extraction is completed (i.e., One-day TAT yields results in 3 days from sample submission).

NOTES:
- MAI assumes that all material present in the provided sampling container is considered part of the sample - MAI does not exclude any material from the sample prior to sample preparation unless requested in writing by the client.

Page 41 of 43 ends

Page 42 of 43 ends

Sample Receipt Checklist
McCampbell Analytical, Inc. 1534 Willow Pass Road, Pittsburg, CA 94565-1701 Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 http://www.mccampbell.com / E-mail: [email protected] "When Quality Counts" Client Name: SCS Engineers
WorkOrder №: 1909B99
Date Logged: 9/25/2019
Matrix: SoilGas/Water Logged by: Julia Danielsson
Carrier: Client Drop-In
Shipping container/cooler in good condition? Yes No
Custody seals intact on shipping container/cooler? Yes No NA Samples Received on Ice? Yes No
Chain of custody present? Yes No
Chain of custody signed when relinquished and received? Yes No Chain of custody agrees with sample labels? Yes No
Samples in proper containers/bottles? Yes No
Sample containers intact? Yes No
Sufficient sample volume for indicated test? Yes No
All samples received within holding time? Yes No NA
Sample/Temp Blank temperature NA
Water - VOA vials have zero headspace / no bubbles? Yes No NA pH acceptable upon receipt (Metal: <2; Nitrate 353.2/4500NO3:
<2; 522: <4; 218.7: >8)?
Yes No NA
Temp:

Chain of Custody (COC) Information
Sample IDs noted by Client on COC? Yes No
Date and Time of collection noted by Client on COC? Yes No Sampler's name noted on COC? Yes No
Sample Receipt Information
Sample Preservation and Hold Time (HT) Information
Sample labels checked for correct preservation? Yes No
Project: Chevron
Comments:
pH tested and acceptable upon receipt (200.8: ≤2; 525.3: ≤4; 530: ≤7; 541: <3; 544: <6.5 & 7.5)?
Yes No NA
UCMR Samples:

Free Chlorine tested and acceptable upon receipt (<0.1mg/L)? Yes No NA Date and Time Received 9/25/2019 15:17
Received by: Nancy Palacios
COC agrees with Quote? Yes No NA

Page 43 of 43 ends

February 6, 2020 SMCo Site #550098 / RO708
APN: 014-183-110
Eric Hetrick
Union Oil Company of California c/o
Chevron Environmental Management Company
6101 Bollinger Canyon Road
San Ramon, CA 94583
SUBJECT: FORMER UNOCAL STATION #6980 (CHEVRON #306441) AT 192 EL

CAMINO REAL, SOUTH SAN FRANCISCO, CALIFORNIA
Dear Mr. Hetrick:

Thank you for the Summary Letter, Soil Vapor Assessment prepared by SCS Engineers and submitted to the State GeoTracker database on January 9, 2020 for the subject case. Based on review of the subject report, San Mateo County Groundwater Protection Program (GPP) has the following comments.
 Post-remedial vapor sampling indicates that conditions do not meet Low-Threat Policy Criteria (LTPC) for potential vapor intrusion. It appears that residual mass exists sufficient to create a potential risk to future buildings. The proposed limited-term vapor extraction only from the unimpacted excavation backfill will likely not remove significant sorbed mass. While the stated objective is to increase oxygen within the backfill to create a bioattenuation zone, this will likely only be a temporary condition, which will return to the currently observed equilibrium conditions over time. As such, GPP cannot support the proposed backfill only vapor extraction approach as it appears unlikely to achieve longterm creation of a bio-attenuation zone.  GPP would be able to support vapor extraction that targets residual mass in native soils, or the installation of active vapor mitigation systems that ensures that future buildings are protected from vapor intrusion. It should be noted that GPP could not currently close the case with a mitigation system. However, GPP may allow the case to remain open with mitigation and long-term annual monitoring to allow residual contamination to naturally attenuate to a point that vapor mitigation is no longer needed and the case can be closed.

Please prepare and submit a work plan to perform vapor extraction that targets residual sorbed mass or prepare and submit a vapor mitigation and monitoring plan for the future buildings potentially impacted by soil vapor in excess of commercial ESLs no later than June 12, 2020.

Please note that the mitigation option may not yield case closure for a significant amount of time.

February 6, 2020

Page 2 ends

I appreciate your cooperation. I can be reached by phone at (650) 399-5959 or by e-mail at [email protected] if you have any questions.

Sincerely,
Jacob Madden, PG
Hazardous Materials Specialist
Groundwater Protection Program
cc: Billy Gross, City of South San Francisco Planning Department (via [email protected]) William Mitchell, W.T. Mitchell Group, P.O. Box 5127, Walnut Creek, CA 94596 Robert C. Goodman, Rogers Joseph O’Donnell PC, (via [email protected]) James G. Ritchie, SCS Engineers, (via [email protected]) Shamain Partnership, 3380 Vincent Rd., Suite Hub, Pleasant Hill, CA 94523 EXECUTION COPY SEPTEMBER 8, 2017
- 1 -
00818.4400818.4

ENVIRONMENTAL AGREEMENT
THIS ENVIRONMENTAL AGREEMENT (“Agreement”) is entered into by and between CHEVRON ENVIRONMENTAL MANAGEMENT COMPANY, a California corporation (“EMC”), for itself and as attorney-in-fact for UNION OIL COMPANY OF CALIFORNIA (“Union Oil”), a California corporation, and SHAMAIM, INC., a California corporation (“Owner”).

RECITALS
A. Owner holds record title to certain real property commonly known as 190-192 El Camino Real, in the City of South San Francisco (“City”), County of San Mateo, State of California, APN 014-183-110, as depicted on Exhibit “A”, attached hereto and incorporated herein (the “Property”).

B. From at least 1970 to 1996, Luis Davidsohn and Susana Distel de Davidsohn owned the Property. In 1996, the Davidsohns transferred the Property to Shamaim Partnership, which subsequently transferred the Property to Owner. Luis Davidsohn is a principal of Owner.

C. J.C. Penny Company, Inc. (“JC Penney”) was the ground lessee of the Property from 1970 to 2009. During a portion of this period, Tesoro Companies Inc. (“Tesoro”) operated a service station at the Property pursuant to a license agreement with J.C. Penney.

D. In 1984, EMC’s affiliate, Union Oil, purchased the service station from Tesoro, and a retail service station commonly referred to as Service Station 306441 (formerly Service Station No. 6980) was operated at the Property. EMC represents that as part of the TesoroUnion Oil transaction, Tesoro, J.C. Penney and Union Oil entered into an Assignment and Amendment of License. J.C. Penney subsequently assigned its ground lease to Pacific/DSLA No. 2.

E. The service station was closed in 1992, and the product dispenser and associated piping and steel-walled underground storage tanks were removed in April 1992.

F. BFS Retail & Commercial Operations, LLC (“BFS”) operated a “Firestone Complete Auto Care” facility on a portion of the Property, which included a service building, three service bays and an office. The building and facilities were demolished in April 2016.

In connection with the demolition work, BFS retained Stantec Consulting Services, Inc. to remove and dispose of soil impacted by hydraulic fluid associated with BFS’ former use of hydraulic lifts in its operations under the oversight of the San Mateo County Health Department (the “County”).

G. Petroleum hydrocarbons and associated constituents allegedly were released as a result of the service station operations at the Property. Since approximately 1992, the Property has been investigated under the direction of the County.

H. Owner, along with one or more joint venture partners, or through one or more affiliates, plans to redevelop the Property, including construction of multiple slab on grade EXECUTION COPY SEPTEMBER 8, 2017
- 2 -
00818.4400818.4
buildings without basements, a parking lot, and improved landscaping (collectively, the “Redevelopment Project”), as generally depicted in Exhibit “B” hereto, at which time Covered Contamination (as defined in Section 1.2 below) may be encountered.

I. EMC’s consultant, Stantec Consulting Services Inc., prepared a Revised Remedial Action Plan for the Property, dated July 8, 2014 (“Revised RAP”) that was submitted to the County for approval. The Revised RAP calls for the excavation of approximately 6,296 cubic yards of soil at the Property, as depicted in Figure 3 of the Revised RAP. On August 21, 2014, the County approved the Revised RAP. A copy of the Revised RAP is attached hereto as Exhibit “C”.

J. As part of and subject to the terms of this Agreement, Owner has agreed to implement the Revised RAP at EMC’s cost. Owner solicited bids for implementation of the Revised RAP and has selected SCS Engineers (“SCS”) to implement the Revised RAP pursuant to SCS’s Revised Fixed Price Proposal for RAP Implementation, 190-192 El Camino Real, South San Francisco, California dated August 25, 2017 (“Proposal”). A copy of the Proposal is attached hereto as Exhibit D. Owner and EMC have reviewed and approved the Proposal.

K. The parties enter into this Agreement to provide, among other things, for payment by EMC of the costs to (i) implement the Revised RAP, as described in Article 2; and (ii) design, install and operate vapor mitigation at the Property, if necessary, as described in Sections 2.4 and 2.5.

TERMS AND CONDITIONS
NOW THEREFORE, in consideration of and in reliance upon the foregoing Recitals and of the mutual promises set forth below, the parties agree as follows:

ARTICLE 1

DEFINITIONS

1.1 Agency. As used herein, “Agency” means governmental agencies having jurisdiction over environmental matters at the Property, including, without limitation, the County and the California Regional Water Quality Control Board – San Francisco Bay Region (“Regional Board”).

1.2 Covered Contamination. As used herein, “Covered Contamination” means petroleum hydrocarbon contamination, including any associated constituents, additives and breakdown products that: (a) originated from Union Oil’s operations or activities on the Property and (b) requires investigation and/or remediation pursuant to applicable federal, state or local laws and regulations, or as may be otherwise validly required by the Agency.

Covered Contamination shall not include the infrastructure, including but not limited to any tanks, piping, or related equipment or any surface or subsurface structures present on the Property (“Infrastructure”), nor does it include any naturally occurring petroleum hydrocarbons (e.g. crude oil) or environmental contamination released on or off the Property by a party other than Union Oil, its predecessors, successors or affiliates. In the event that EMC and Owner disagree as to whether environmental contamination is Covered EXECUTION COPY SEPTEMBER 8, 2017
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Contamination, the parties agree to use the Alternative Dispute Resolution procedure outlined in Section 4.3 of this Agreement.

1.3 Covered Contaminated Soil. As used herein, “Covered Contaminated Soil” means any soil removed from the Property by Owner or its contractors as necessary for the implementation of the Revised RAP at the Property that is contaminated with Covered Contamination. The parties agree that soil classification sampling and analysis to determine whether soil is contaminated shall be performed in a cost effective manner and in accordance with the Revised RAP.

1.4 Covered Contaminated Groundwater. As used herein, “Covered Contaminated Groundwater” means any water, including groundwater, surface water, and rain water extracted by Owner or its contractors at or from the Property for purposes of dewatering subsurface locations as necessary for implementation of the Revised RAP at the Property that is contaminated with Covered Contamination. The parties agree that the sampling and analytical methods used to determine whether water is contaminated shall be performed in accordance with any applicable Agency discharge standards or as may be otherwise be validly directed by the Agency.

1.5 Covered Contaminated Material. As used herein, “Covered Contaminated Material” shall mean Covered Contaminated Soil and Covered Contaminated Groundwater.

1.6 Developer Party(ies). As used herein, “Developer Party(ies)” shall mean (a) Owner and (b) any person or entity holding an ownership interest in all or any portion of the Property prior to completion of the Redevelopment Project, defined as the date on which the City issues a final certificate of occupancy for the Redevelopment Project (the “Redevelopment Completion Date”).

1.7 Effective Date. This Agreement shall be immediately effective on the date both parties have executed the Agreement.

1.8 Termination Date. This Agreement shall terminate upon: (a) the earlier to occur of (i) the Redevelopment Completion Date or (ii) five years following the Effective Date; and (b) EMC’s payment or reimbursement of all costs as required under this Agreement; provided, however, that the release and indemnity provisions of Section 2.6 and Article 3 shall survive the termination of this Agreement.

ARTICLE 2
OWNER’S CONSTRUCTION ACTIVITIES

2.1 Implementation of Revised RAP. Subject to EMC’s payment obligations pursuant to Section 2.2 below, Owner shall implement the Revised RAP by retaining SCS to implement the Revised RAP for a fixed fee of $672,940 , as set forth in the Proposal (the “Fixed Fee Price”), and Owner shall oversee such implementation. Other than Owner’s specific commitments under this Section 2.1, nothing in this Agreement is intended to or shall be deemed or construed as an assumption by Owner or any Owner Party of any obligation or liability of EXECUTION COPY SEPTEMBER 8, 2017
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EMC, Union Oil or any other party, with respect to environmental contamination at or emanating from the Property, including any Covered Contamination.

2.2 Payment by EMC for Implementation of the Revised RAP.

2.2.1 EMC shall pay SCS for work performed to implement the Revised RAP in accordance with the terms of the Proposal, on the schedule set forth in Sections 2.2.1(A)-(D) below. Payment shall be made only after EMC’s receipt of (a) any tax forms that need to be completed by SCS in order to process payment and (b) the applicable certification(s) and confirmation described below.

A. $33,647 thirty (30) days after EMC’s receipt of SCS’s invoice and a written certification from Owner’s Consultant (as defined in Section 2.2.5 below) that Work Plans needed for excavation have been submitted to oversight regulatory agencies; B. $33,647 thirty (30) days after EMC’s receipt of SCS’s invoice and a written certification from Owner’s Consultant that wells located beyond the excavation footprint have been abandoned according to oversight regulatory agency requirements; C. $134,588 thirty (30) days after EMC’s receipt of SCS’s invoice and a written certification from Owner’s Consultant that excavation of the Property has commenced, in accordance with the Proposal;
D. $201,882 thirty (30) days after EMC’s receipt of SCS’s invoice and a written certification from Owner’s Consultant that excavation of the Property has been completed;
E. $201,882 thirty (30) days after EMC’s receipt of SCS’s invoice and a written certification from Owner’s Consultant that excavation backfilling and compaction has been completed;
F. $33,647 thirty (30) days after EMC’s receipt of SCS’s invoice and a written certification from Owner’s Consultant that the County has approved the Remedial Completion Report; and,
G. $33,647 thirty (30) days after EMC’s receipt of SCS’s invoice and a written certification from Owner’s Consultant that all post excavation soil vapor sampling has been completed.

2.2.2 Contingent Remediation Work. As described in the Proposal (see Exhibit D), the Proposal provides for a 5% contingency of $33,647 to be reserved in the event of a soil volume overage due to the possible variability in excavation dimensions and resulting excavated soil volume, to pay for a Soil Excavation Work Plan if required by the GPP, and/or to account for delays or unanticipated conditions attributed to wet weather (“Contingent Work”).

A. In the Proposal, SCS has agreed that the Contingent Work will be incurred only if the tonnage of soil removed and disposed exceeds the amount provided in the RAP, or should a Soil Excavation Work Plan be required by the GPP, and/or to account for EXECUTION COPY SEPTEMBER 8, 2017
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delays or unanticipated conditions attributed other to wet weather. Prior to SCS preparing a Soil Excavation Workplan or performing any Contingent Work, Owner shall first submit a proposed budget and scope of work for such work to EMC for review and approval, which approval shall not be unreasonably withheld, conditioned or delayed; provided, however, that where SCS seeks to apply the Contingent Fee to costs associated with overage of volume or weight of soils previously approved for removal due to the possible variability in excavation dimensions and and/or to account for delays or difficult conditions attributed to wet weather, in lieu of first submitting a proposed budget and scope, SCS shall submit detailed documentation supporting such increase or delays with any invoice seeking any portion of the Contingent Fee for such work.

B. EMC shall pay SCS for reasonable and approved Contingent Work (“Contingent Remediation Work Costs”) within forty-five (45) days following receipt of detailed invoice(s) for reimbursement of such costs, which shall include a breakdown of all costs sought, a copy of the supporting invoices, and proof of completion of the invoiced work. Such requests shall not be made more than once during each thirty (30) day period.

2.2.3 Supplemental Remediation Work. As described in the Proposal (see Exhibit D), the Fixed Fee Price does not include the costs for storage, characterization and disposal of Covered Contaminated Groundwater or work required by any Agency that exceeds the scope of work identified in the Revised RAP, including excavation beyond the area identified in the Revised RAP, soil testing beyond the 15 samples identified in the Proposal, and any vapor sampling beyond that proposed in the Revised RAP (collectively, the “Supplemental Remediation Work”).

A. In the Proposal, SCS has agreed to perform any Supplemental Remediation Work on a time and materials or unit price basis as agreed upon by Owner and SCS. Prior to authorizing SCS to perform any Supplemental Remediation Work, Owner shall first submit a proposed budget and scope of work for such work to EMC for review and approval, which approval shall not be unreasonably withheld, conditioned or delayed.

B. EMC shall pay SCS for reasonable and approved costs for performing Supplemental Remediation Work (“Supplemental Remediation Work Costs”) within forty-five (45) days following receipt of detailed invoice(s) for reimbursement of such costs, which shall include a breakdown of all costs sought, a copy of the supporting invoices, and proof of completion of the invoiced work. Such requests shall not be made more than once during each thirty (30) day period.

2.2.4 Owner Right to Pay for Disputed Contingent Work and Disputed Supplemental Work. In the event that EMC objects to a scope of work or budget for Contingent Work or Supplemental Work pursuant to Section 2.2.2.A or 2.2.3.A, or fails to timely pay for approved Supplemental Work pursuant to Section 2.2.2.B or 2.2.3.B, then Owner may authorize SCS to perform such disputed work and/or may pay for such disputed work, and shall have the right to seek reimbursement of the amounts paid from EMC. In the event that EMC and Owner disagree as to whether any such payments are subject to reimbursement under this Agreement, the parties agree to use the Alternative Dispute Resolution procedure outlined in Section 4.3 of EXECUTION COPY SEPTEMBER 8, 2017
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this Agreement, and Owner shall have the right to recover such payments only to the extent that it can demonstrate that the scope of work and related costs were reasonable.

2.2.5 Owner Consultant Costs. EMC shall pay to Owner a sum not to exceed $20,000 as reimbursement for third party consultant (“Owner Consultant”) costs (including past costs) reasonably required to facilitate Agency approval of the Revised RAP and to oversee SCS’s implementation of the same (“Owner Consultant Costs”). EMC shall reimburse Owner for such Owner Consultant Costs within thirty (30) days following receipt of Owner’s request(s) for reimbursement of such costs. Said requests shall include a breakdown of all costs sought by Owner, a copy of the supporting invoices, proof of payment, and any tax forms that need to be completed by Owner in order to process payment.

2.3 Vapor Mitigation System. If the Agency determines that a vapor mitigation system is necessary for the Redevelopment Project after the completion of the work required by the Revised RAP (including any Supplement Remediation Work) due to the presence or alleged presence of Covered Contamination at the Property, Owner agrees to use commercially reasonable efforts to obtain Agency approval of a Liquid Boot® or equivalent vapor barrier beneath the building to the extent that any such system is required. If the Agency does not approve such a system, then Owner agrees to design and install an alternate agency-approved vapor mitigation system. Owner agrees to provide EMC with a written copy of the third-party proposal to design and install the vapor mitigation system to be implemented as required by the Agency, including without limitation all testing and startup costs, within five (5) days after Owner’s receipt of such proposal. EMC shall have fifteen (15) business days following its receipt of the proposal to review and approve the proposal and budget, which approval shall not be unreasonably withheld, conditioned or delayed. If EMC does not notify Owner of its disapproval of the proposal in writing with that 15 business day period, then the proposal shall be deemed approved. EMC agrees to pay the third-party contractor(s) for the reasonable cost of the agency-approved vapor mitigation work within forty-five (45) days after EMC’s receipt of (a) any tax forms that need to be completed by the contractor(s) in order to process payment and (b) proof that the vapor mitigation system has been installed in accordance with the terms of the approved proposal.

2.4 Vapor Mitigation Long-Term Operation. All costs related to the long-term operation of the vapor mitigation system, including but not limited to maintenance, repairs and Agency oversight, shall be borne by EMC and paid to Owner as a single lump sum payment, as follows. Within fifteen (15) days following Agency’s approval of an appropriate vapor mitigation system, if any, the parties shall meet in good faith to agree upon the net present value for all costs related to the long-term operation of the vapor mitigation system. The parties shall negotiate for a period not to exceed thirty (30) days. EMC shall pay the lump sum to Owner within thirty (30) days following agreement or other determination of the lump sum amount. .

2.5 Payments. All payments to Owner under this Agreement shall be paid to:

Shamaim Incorporated, c/o Roberto Davidsohn, 848 N. Rainbow Blvd., Suite 2885, Las Vegas, NV 89107. All payments to SCS under this Agreement shall be paid to: SCS Engineers 3900 Kilroy Airport Way, Suite 100, Long Beach, CA 90806-6816 (Tax ID No: 54-0913440), with a copy to Shamaim Incorporated, c/o c/o Roberto Davidsohn, 848 N. Rainbow Blvd., Suite 2885, Las Vegas, NV 89107.

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2.6 Disposal Facility Designation. All manifests for Covered Contaminated Material removed from the Property shall identify Owner as the generator. As used in this Section 2.6, the term “generator” refers to the party arranging for the transportation and disposal of such Covered Contaminated Material, including designation of the disposal site. The generator agrees to select a licensed disposal facility that meets federal, state, and local laws and requirements and to inform EMC of its selection in advance. In the event that Owner incurs any cost or liability by being the generator with respect to Covered Contamination at the Property, EMC will defend, indemnify, and hold harmless Owner for all such cost and liability. This indemnity shall survive the termination of this Agreement.

2.7 Disputes. Should any disputes arise between the parties regarding any payment or demand for payment pursuant to Sections 2.2 through 2.6 of this Agreement, the parties agree to use the procedure set forth in Section 4.3 (ADR) prior to pursuing other legal remedies.

ARTICLE 3

RELEASE & INDEMNITY

3.1. Release. Except for the performance of EMC’s obligations under this Agreement and actions to enforce the same, Owner on behalf of itself and its parents, affiliates, subsidiaries, representatives, agents, predecessors, successors and assigns, and each of their respective directors, officers, counsel, and employees (collectively, the “Releasing Parties”) hereby releases EMC, Union Oil, and each of their parents, affiliates, subsidiaries, representatives, agents, predecessors, successors, and assigns, and each of their respective directors, officers, counsel, and employees (including but not limited to Chevron Corporation) (collectively, the “Released Parties”) from any and all liabilities, claims, demands, lawsuits, damages (including consequential damages), costs, and losses that Releasing Parties now have or may have in the future arising out of or in any way related to (a) Covered Contamination at, under or from the Property; (b) Union Oil’s and its predecessors’ or affiliates’ former operations on the Property; (c) Owner’s construction activities at the Property; (d) the Redevelopment Project; (e) implementation of the Revised RAP and any Contingent Work or Supplemental Remediation Work; (f) the Revised RAP costs, Contingent Remediation Work Costs, Supplemental Remediation Work Costs, and Agency oversight costs; and (g) any attorneys’ fees incurred by Owner in connection with any of the above. The release provided in this Section 3.1 shall survive the termination of this Agreement. The claims released herein shall include, without limitation, any and all unknown claims relating to the presence of contamination at, under, or from the Property. Owner hereby waives any and all rights that it may have under any and all statutes or laws that purport to limit the scope of the general release including, without limitation, Section 1542 of the Civil Code of the State of California which provides as follows:

A general release does not extend to claims which the creditor does not know or suspect to exist in his or her favor at the time of executing the release, which if known by him or her must have materially affected his or her settlement with the debtor.

Owner’s affiliates shall include but not be limited to any entities owned in whole or in part by any person also holding an ownership interest in Owner. Owner represents and warrants EXECUTION COPY SEPTEMBER 8, 2017
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that it has the ability to provide this release on behalf of all such affiliates in existence as of the Effective Date.

3.2. Subsequent Owners. Owner represents and warrants that as of the Effective Date it is the sole owner of the Property and the improvements thereon and has not heretofore assigned, transferred, or purported to assign or transfer to any person or entity, any liability, claim, demand, action, cause of action, or right which is herein released and discharged in Section 3.1. Owner agrees that, prior to any sale or transfer of the Property, or any portion thereof, from Owner to a third party (each a “Subsequent Owner”), Owner shall: (a) provide a copy of this Agreement to the Subsequent Owner; (b) require the Subsequent Owner to agree in writing to assume and be bound by the release terms of this Agreement; (c) provide written notice to EMC of the scheduled sale or transfer of the Property at least fourteen (14) days before any sale or transfer of the Property is completed; and (d) require as part of the purchase and sale agreement with a Subsequent Owner that the Subsequent Owner provide a provision the same as that contained in this Section 3.2 in its purchase and sale agreement with a successor Subsequent Owner. If Owner fails to comply with the requirements of the prior sentence, EMC shall be entitled to seek any and all damages it suffers as a result of such breach, but shall not seek to void the sale or transfer.

3.3. Indemnity. EMC agrees to indemnify, defend and hold harmless Owner and its parents, affiliates, subsidiaries, representatives, agents, predecessors, successors, lenders, members and assigns, and each of their respective directors, officers, counsel, and employees (collectively, the “Indemnitees”) from and against any and all liabilities, claims, demands, lawsuits, damages, costs, and losses arising out of or in any way related to (a) claims, demands or lawsuits by third parties relating to any Covered Contamination; and (b) an Agency demand or requirement that Owner perform an investigation or cleanup action for Covered Contamination at, under or from the Property. The following are not third parties for the purpose of subsection (a): (i) past, present, or future tenants or condominium owners at the Property; (ii) any person with a right to indemnification under this Section 3.3 at any point in time; (iii) Releasing Parties; and (iv) Subsequent Owners of the Property. EMC shall not be responsible for any liabilities, damages, or losses to the extent caused by the reckless, negligent, or intentional acts or omissions of the party asserting a right to indemnification under this Section 3.3. This indemnity shall survive the termination of this Agreement.

3.4. Claims. No party claiming a right to be indemnified by EMC under this Agreement shall be entitled to such indemnification unless: (a) said party agrees in writing to be bound by the terms of this Agreement, including, without limitation, the release obligations of Section 3.1 (Release); and (b) after receiving notice of any such claim described in EMC’s indemnity under Section 3.3, said party provides EMC with reasonable written notice of the claim and a demand that EMC honor its indemnity obligations under Section 3.3 (Indemnity).

3.5. Damages. Except as expressly provided in this Agreement, the Released Parties shall not be liable to any other party for: (a) any claims attributable to or arising from construction on the Property by any party other than the Released Parties or their respective contractors following the Effective Date that involve subsurface excavation, soil movement, and/or special handling, treatment, or disposal of water; or (b) special, incidental, or EXECUTION COPY SEPTEMBER 8, 2017
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consequential damages including, without limitation, construction delays, loss of business, diminution in the value of the Property, or loss of goodwill. Provided, however, that Owner is not releasing EMC from actions to enforce the terms and conditions of this Agreement or from actions for breach of the terms and conditions of this Agreement, and in such actions shall be entitled to seek any and all damages it suffers resulting from the breach.

3.6. County Recording. It is the intention of the parties that the release by the Releasing Parties shall be binding with respect to current and future owners, including subsequent owners and occupants of the Property. Within fourteen (14) days after the Effective Date, Owner shall record with the San Mateo County Recorder’s Office a memorandum of this Agreement, in the form attached as Exhibit E, in order to provide notice of the release to future owners and occupants of the Property. Owner will provide EMC with a copy of the recorded Memorandum of Agreement within ten (10) days after receipt back from the County Recorder’s Office.

ARTICLE 4

GENERAL PROVISIONS

4.1 Incorporation of Recitals. The recitals and definitions in this Agreement are incorporated herein as terms and conditions to this Agreement.

4.2 Notices. Any notices required to be made under this Agreement shall be made in writing to the address of the appropriate party as set forth below. All such notices shall be deemed to have been duly given and received upon mailing or delivery by courier or personal delivery service. Parties may alter or modify their notice address by delivery of written notice pursuant to the terms of this Agreement.

To EMC: Chevron Environmental Management Company
6001 Bollinger Canyon Road
San Ramon, CA 94583
Attn.: Kelly York
Phone: 925.842.1819
Email: [email protected]
With courtesy copies to: Robert C. Goodman
Rogers Joseph O’Donnell
311 California Street, 10th Floor
San Francisco, CA 94104
Phone: 415.956.2828
Email: [email protected]
To Owner: Shamaim Incorporated
c/o Roberto Davidsohn
848 N. Rainbow Blvd., Suite 2885
Las Vegas, NV 89107
303-847-0781
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[email protected]
and
El Camino & Spruce, LLC
Bosques De Alamos #5
Mexico D.F. 11700
Mexico
Attn: Luis Davidsohn
Phone: 702-943-0113
Email: [email protected]
With courtesy copies to: Stuart I. Block
Stice & Block, LLP
2235 Broadway, Suite 201
Oakland, CA 94612
Phone: 510.735.0033
Email: [email protected]

4.3 Alternative Dispute Resolution (ADR). If a dispute arises between the parties relating to this Agreement, the parties agree to use the following procedure prior to pursuing other legal remedies:

4.3.1 A meeting among the parties shall promptly be held in the San Francisco Bay Area, attended by individuals with decision-making authority regarding the dispute, who will attempt in good faith to negotiate a resolution of the dispute.

4.3.2 If within fifteen (15) days after the meeting, the parties have not succeeded in negotiating a resolution of the dispute, they agree to submit the dispute to mediation using a mediator who is mutually acceptable, and to bear equally the costs of the mediation.

4.3.3 The parties agree to participate in good faith in the mediation process related to their dispute for a period of thirty (30) days from the commencement of mediation. If the parties are not successful in resolving the dispute through mediation, then:

4.3.3.1 if both parties agree, they may submit the matter to a binding arbitration or a private adjudicator; or

4.3.3.2 either party may initiate litigation upon ten (10) days advance written notice to the other party.

4.4 Cooperation and Information Exchange. Each party hereto shall promptly provide the other party with copies of all correspondence, notices, reports, laboratory test results, and any other related non-privileged documentation regarding Covered Contamination and submitted to the Agency. Both parties hereto shall be afforded the opportunity to participate in EXECUTION COPY SEPTEMBER 8, 2017
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any meetings or conference calls between the other parties hereto and the Agency. Both parties shall cooperate in good faith to implement this Agreement.

4.5 Applicable Law. This Agreement shall be interpreted, and any disputes arising hereunder shall be resolved, in accordance with the substantive laws of the State of California, without reference to choice of law rules.

4.6 Counterparts and Facsimile or Electronic Copy. This Agreement may be executed in counterparts, all of which together shall constitute one and the same agreement. An electronic copy of an original signature will be deemed to have the same force and effect as the original signature.

4.7 Integration. This document represents the entire agreement between the parties regarding the issues specifically addressed herein. No modifications of the Agreement shall be effective unless in writing and duly executed by the authorized representatives of the respective parties.

4.8 Ambiguities. This Agreement has been negotiated at arm’s-length between parties represented by counsel. Accordingly, any rule or law or legal decision that would require interpretation of any ambiguities in this Agreement against the party that has drafted the applicable provision is not applicable and is waived. Each party bears its own costs incurred to prepare this Agreement. The provisions of this Agreement shall be interpreted in a reasonable manner to effect the purposes of the parties and this Agreement.

4.9 No Admission of Liability. The parties acknowledge and agree that neither this Agreement nor the act of entering into it or any act pursuant hereto shall be construed as an admission of any nature.

4.10 Captions. The captions and headings used throughout this Agreement are for convenience or reference only, and the words contained therein shall in no way be held or deemed to define, limit, describe, explain, modify, amplify, or aid in the interpretation, consideration, or meaning of any provisions or the scope or the intent of this Agreement.

4.11 Severability. If any part, clause or condition of this Agreement is held by a court of competent jurisdiction to be unenforceable for any reason, it shall be adjusted rather than voided, if possible, in order to achieve the intents of the parties. In any event, the remainder of the provisions shall remain in full force and effect and shall in no way be affected, impaired or invalidated; provided, however, in no event shall either party be deprived of a material consideration by operation of this provision.

4.12 Fiduciary Relationship. EMC shall not for any reason be considered to have a fiduciary relationship with Owner, nor shall Owner for any reason be considered to have a fiduciary relationship with EMC.

4.13 Binding Effect. Subject to the limitations set forth in Article 3 (Release & Indemnity), this Agreement shall be binding upon and inure to the benefit of the parties hereto and their respective heirs, successors and assigns. In the event of a transfer of interest in the EXECUTION COPY SEPTEMBER 8, 2017
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Property, the parties shall comply with the terms of Section 3.2 (Subsequent Owners) above regarding subsequent owners.

4.14 Warranty of Authorized Signatories. Owner warrants and represents that Owner owns the Property and has authority to enter into this Agreement. Each of the authorized signatories hereto warrants and represents that he or she is competent and is authorized to enter into this Agreement on behalf of the party for whom he or she purports to sign.

4.15 No Prior Assignment of Claims. Each party hereby represents and warrants that it has not sold, assigned, transferred, conveyed, hypothecated, encumbered, or otherwise disposed of to any person or entity whatsoever any claims relating to the subject matter of this Agreement.

4.16 No Joint Venture or Partnership; No Third Party Beneficiaries. This Agreement shall not be construed or interpreted to create a partnership or joint venture between the parties and no party will have the authority to bind the others. Nothing contained in this Agreement will be construed as creating a third-party beneficiary relationship amongst the parties; provided, however, that the parties hereby acknowledge and agree that SCS is an intended third party beneficiary of this Agreement with regard to the payment obligations in Sections 2.2.1, 2.2.2, and 2.2.3 and SCS shall be entitled to pursue all available legal remedies, including specific enforcement, in the event of breach of these sections.

4.17 Estoppel Certificate. EMC shall provide, within thirty (30) days after written request therefore, a written statement, in a form reasonably acceptable to EMC, confirming that this Agreement remains in full force and effect and identifying any Owner defaults hereunder.

4.18 Assignment. EMC may assign its rights and obligations under this Agreement to a parent, subsidiary or affiliated entity at its sole discretion and without seeking or obtaining Owner’s consent, provided that such assignee has the financial ability to perform EMC’s obligations under this Agreement. Owner may assign this Agreement to any (or all) Developer Party(ies) without forfeiting or diminishing its rights and obligations under this Agreement, provided that the assignee agrees in writing to be bound by the terms and obligations of this Agreement, including the Release, and written notice and a copy of the assignment and assumption agreement is provided to EMC within sixty (60) days after the assignment.

IN WITNESS WHEREOF, the parties have caused this Agreement to be executed as of the last date signed.

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EMC: CHEVRON ENVIRONMENTAL
MANAGEMENT COMPANY, for itself and
as attorney-in-fact for UNION OIL

COMPANY OF CALIFORNIA

Dated:____________________, 2017 By:

Name:

Its:

OWNER: SHAMAIM, INC.

Dated___________________, 2017 By:

Name:

Its:

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EXHIBIT "A"
Legal Description
Real property in the City of South San Francisco, County of San Mateo, State of California, described as follows:

ALL THAT CERTAIN REAL PROPERTY SITUATE IN THE CITY OF SOUTH SAN FRANCISCO, COUNTY OF SAN MATEO, STATE OF CALIFORNIA, BEING LOT 1, BLOCK 2, AS DESIGNATED ON THE MAP ENTITLED, "TANFORAN PARK, UNIT NO. 2," WHICH MAP WAS FILED IN THE OFFICE OF THE RECORDER OF THE COUNTY OF SAN MATEO, STATE OF CALIFORNIA, JANUARY 5, 1967, IN BOOK 66 OF MAPS AT PAGES 5, 6, AND 7, MORE PARTICULARLY DESCRIBED AS FOLLOWS:

BEGINNING AT THE MOST SOUTHERLY CORNER OF SAID LOT 1, SAID CORNER BEING A POINT IN THE NORTHEASTERLY LINE OF EL CAMINO REAL AS SHOWN ON SAID MAP; THENCE ALONG SAID NORTHEASTERLY LINE NORTH 27° 54’ 38" WEST, 86.78 FEET (NORTH 26° 38’ 46" WEST, 86.94 FEET); THENCE NORTH 30° 47’ 29" WEST, 488.12 FEET (NORTH 29° 31’ 37" WEST); THENCE ALONG A TANGENT CURVE TO THE RIGHT, HAVING A RADIUS OF 25.00 FEET, THROUGH A CENTRAL ANGLE OF 89° 46’ 45" AN ARC LENGTH OF 39.17 FEET TO A POINT IN THE SOUTHEASTERLY LINE OF SOUTH SPRUCE AVENUE AS SHOWN ON SAID MAP; THENCE ALONG SAID SOUTHEASTERLY LINE NORTH 58° 59’ 16" EAST, 4.90 FEET (NORTH 60° 15’ 08" EAST); THENCE ALONG A TANGENT CURVE TO THE LEFT, HAVING A RADIUS OF 689.75 FEET, THROUGH A CENTRAL ANGLE OF 27° 31’ 15" AN ARC LENGTH OF 331.31 FEET (R OF 689.95 FEET, CENTRAL ANGLE OF 27° 30’ 30", L OF 331.25 FEET); THENCE NORTH 31° 28’ 01" EAST, 272.47 FEET (NORTH 32° 44’ 38" EAST, 272.47 FEET); THENCE ALONG A TANGENT CURVE TO THE RIGHT, HAVING A RADIUS OF 1961.99 FEET, THROUGH A CENTRAL ANGLE OF 5° 32’ 44", AN ARC LENGTH OF 189.90 FEET (R OF 1959.86 FEET, CENTRAL ANGLE OF 5° 32’ 02", L OF 189.29 FEET); THENCE NORTH 37° 00’ 45" EAST, 45.82 FEET (NORTH 38° 16’ 40" EAST, 46.42 FEET); THENCE LEAVING SAID SOUTHEASTERLY LINE SOUTH 52° 59’ 15" EAST, 232.76 FEET (SOUTH 51° 43’ 20" EAST); THENCE ALONG A TANGENT CURVE TO THE RIGHT, HAVING A RADIUS OF 1999.86 FEET, THROUGH A CENTRAL ANGLE OF 0° 22’ 21", AN ARC LENGTH OF 13.00 FEET (CENTRAL ANGLE OF 0° 22’ 22", L OF 13.01 FEET); THENCE NORTH 57° 19’ 24" EAST, 130.66 FEET (NORTH 58° 35’ 52" EAST, 130.53 FEET) TO A POINT IN THE SOUTHWESTERLY LINE OF HUNTINGTON AVENUE AS SHOWN ON SAID MAP; THENCE ALONG SAID SOUTHWESTERLY LINE ALONG A NON-TANGENT CURVE TO THE RIGHT, HAVING A RADIUS OF 959.93 FEET, CONCAVE TO THE SOUTHWEST, WHOSE CENTER BEARS SOUTH 53° 05’ 43" WEST, THROUGH A CENTRAL ANGLE OF 2° 23’ 28", AN ARC LENGTH OF 40.06 FEET; THENCE LEAVING SAID SOUTHWESTERLY LINE SOUTH 57° 19’ 24" WEST, 124.49 FEET (SOUTH 58° 35’ 52" WEST, 124.50 FEET); THENCE SOUTH 32° 40’ 36" EAST, 419.97 FEET (SOUTH 31° 24’ 08" EAST, 419.97 FEET); THENCE NORTH 57° 19’ 24" EAST, 124.99 FEET (NORTH 58° 35’ 52" EAST) TO A POINT IN SAID SOUTHWESTERLY LINE OF HUNTINGTON AVENUE; THENCE ALONG SAID SOUTHWESTERLY LINE SOUTH 32° 40’ 36" EAST, 40.00 FEET (SOUTH 31° 24’ 08" EAST); THENCE LEAVING SAID SOUTHWESTERLY LINE SOUTH 57° 19’ 24" WEST, 134.99 FEET (SOUTH 58° 35’ 52" WEST); THENCE SOUTH 32° 40’ 36" EAST, 82.92 FEET (SOUTH 31° 24’ 08" EAST); THENCE SOUTH 53° 25’ 00" WEST, 923.20 FEET (SOUTH 54° 40’ 52" WEST, 922.99 FEET) TO THE POINT OF BEGINNING.

THE BASIS OF BEARINGS FOR THE ABOVE DESCRIBED PARCEL IS NORTH 58° 59’ 16" EAST

ALONG THE CENTER LINE OF SOUTH SPRUCE AVENUE AS SHOWN ON THE RECORD OF SURVEY RECORDED IN BOOK "6" OF LICENSED LAND SURVEYORS MAPS AT PAGE 77, SAN MATEO COUNTY RECORDS.

APN: 014-183-110; JPN: 014-018-183-11A
EXECUTION COPY SEPTEMBER 8, 2017
- 15 -
00818.4400818.4
EXHIBIT "B"

SITE PLAN OF REDEVELOPMENT PROJECT
[attached]
81 CARS
52 CARS
154 CARS
65 CARS
376 CARS
81 S P R U C E A V E N U E
10% DRIVEWAY DOWN
+40.0
+36.0
+39.2
Existing Driveway
Cart
Storage
9'0" x 18'0" stalls
with 25'0" aisles (typ)
No compacts allowed
5 +39.0
S
31°2
4'0
8" E
8 2.9
2'
Loading Area
Accessible
Ramp
SLOPE
Loading Area
419.9
7'
N
2 9°
31'37" W
4 88.
12'
+34.0
Compactor
+38.0
Returnables
Cart
Storage
6 +38.0
192'
S
31°2
4'0
8" E
7 +26.0
ENTRY
+53.0
A
M
I
N
O
R
E
A
L
Stairs Up
+39.2
8 2.9
2'
+50.0
+33.0
56 22
+39.0
+37.0
+47.0
25,000 S.F.
+37.0
+41.0
+37.0
+47.0
+35.0
+39.0
+40.0
+33.0
+51.0

52.0 15' Storm Drain
Easment
15'
15'
Retaining wall along Property line
with 6' high wood fence
S
5 8°35'52" W
134.9
9'
S
54°40'5
2" W
92 2.9
9'
Existing Driveway
Right In/Right Out
+39.2
+31.0
15'
N38°16'40"E
+25.0
+28.0
15' Storm Drain
Easment
232.76'

46.42'
S51°43'20"E
56 +34.0
+34.0
+38.0
+27.0
+31.5
62,000 S.F.
14 20
59 59
Ramp Up
320'
ENTRY
45,000 S.F.

Health Club
70'
14 8
5,000 S.F. ENTRY
ENTRY
ENTRY
9'0" x 18'0" stalls
with 25'0" aisles (typ)
No compacts allowed
26 25
Cart
Storage
9'0" x 18'0" stalls
with 25'0" aisles (typ)
No compacts allowed
+34.0
12 27
22 +35.0
Stairs Up
3%
+41.0
+34.0
5% Down
6% Up
5% Up
54 Supermarket
Retail Shop
Drugstore
BLDG A
BLDG B
STOP
POTS
7,753 SF
7,984 SF
BLDG D
7,500 SF
BLDG C
7,400 SF
56 19
32 14
117 CARS
26 14
2 6
12 29
34 18
Major 1
Major 2

SLAB STEP

PEDESTRIAN WALK

PEDESTRIAN WALK
10 Trash
Encl.

FF=39.20
FF=39.20
FF=39.20

34.91 4
0 30.00

30.00 35.00

35.00 4
5 42.18

44.67 45.55

47.60 49.24

50.14 51.55
30 30
D Y H
D Y H
E
L
CAM
NI O
R
EAL
D Y H
D Y H
D Y H
D Y H
D Y H
D Y H
D Y H
D Y H
PARCEL 1
PARCEL 2
PARCEL 3
19,500 SF
18,300 SF
EXECUTION COPY SEPTEMBER 8, 2017
- 16 -
00818.4400818.4
EXHIBIT "C"

REVISED REMEDIAL ACTION PLAN
[attached]

Revised Remedial Action Plan
Chevron 306441
(Former Unocal No. 6980
190-192 El Camino Real
South San Francisco, California
San Mateo County Case No. 550098
Submitted to:

Mr. Deno Milano, P.G.

San Mateo County Health System –
Groundwater Protection Program
2000 Alameda de Las Pulgas, Ste 100
San Mateo, CA 94403
Prepared for:

Mr. Erik Hetrick
Chevron Environmental
Management Company
6101 Bollinger Canyon Road
San Ramon, CA 94583
Prepared by:

Stantec Consulting Services Inc.
3017 Kilgore Road, Suite 100
Rancho Cordova, CA 95670
Stantec Project Number:
211602175.702.0410
July 8, 2014

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
July 8, 2014
bm v:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\05_report_deliv\deliverables\reports\2014\306441_revised_rap_fnl_07082014.docx i Table of Contents

1.0 INTRODUCTION ............................................................................................................. 1

2.0 BACKGROUND.............................................................................................................. 2

2.1 SITE LOCATION .................................................................................................................. 2

2.2 SITE GEOLOGY................................................................................................................... 2

2.3 SITE HYDROGEOLOGY...................................................................................................... 3

2.4 BENEFICIAL USES OF GROUNDWATER AND SURFACE WATER ..................................... 3

2.5 PREVIOUS WORK ............................................................................................................... 3

2.6 GROUNDWATER MONITORING AND SAMPLING HISTORY ........................................... 4

2.7 SENSITIVE RECEPTORS ....................................................................................................... 4

2.8 REMEDIAL AND PILOT TEST HISTORY ................................................................................ 5

3.0 REMEDIAL ACTION OBJECTIVES ................................................................................... 7

4.0 EXCAVATION ................................................................................................................ 9

4.1 DETERMINATION OF EXCAVATION LIMITS....................................................................... 9

4.2 PERMITTING........................................................................................................................ 9

4.3 SITE HEALTH AND SAFETY PLAN...................................................................................... 10

4.4 SCOPE OF WORK PHASE I– WELL DESTRUCTION.......................................................... 10

4.4.1 Subsurface Utility Clearance....................................................................... 10

4.4.2 Well Destruction............................................................................................ 11

4.5 SCOPE OF WORK PHASE II– EXCAVATION ................................................................... 11

4.5.1 Storm Water Pollution Prevention Plan ...................................................... 11

4.5.2 Excavation Shoring/Sloping ........................................................................ 11

4.5.3 Soil Sampling and Analysis .......................................................................... 11

4.5.4 Soil and Groundwater Management........................................................ 11

4.5.5 Site Grading................................................................................................... 12

4.5.6 Vapor Mitigation System Installation.......................................................... 12

5.0 POST REMEDIATION MONITORING............................................................................. 13

6.0 POST REMEDIATION GROUNDWATER MONITORING ................................................. 14

7.0 REPORTING AND SCHEDULE ....................................................................................... 16

7.1 REPORTING ...................................................................................................................... 16

7.2 SCHEDULE ........................................................................................................................ 16

8.0 LIMITATIONS AND CERTIFICATION ............................................................................. 17

9.0 REFERENCES CITED ...................................................................................................... 18

TABLE OF CONTENTS (CONTINUED)

LIST OF FIGURES
Figure 1 Site Location Map
Figure 2 Site Plan
Figure 3 Geologic Cross Sections with Proposed Excavations Figure 4 TPH-GRO Isoconcentration Map, Unsaturated Soil, 0-20 Feet BGS Figure 5 Benzene Isoconcentration Map, Unsaturated Soil, 0-20 Feet BGS Figure 6 Site Plan with Proposed Excavation Overlayed on TPH-GRO Isoconcentration Map, Unsaturated Soil, 0-20 Feet BGS
Figure 7 Site Plan with Proposed Excavation Overlayed on Benzene Isoconcentration Map, Unsaturated Soil, 0-20 Feet BGS
Figure 8 Site Plan with Storm Drain Layout

LIST OF TABLES
Table 1 Historical Soil Analytical Data
Table 2 Historical Groundwater Analytical and Monitoring Data Table 3 Historical Soil Vapor Analytical Data
Table 4 Historical Groundwater Gradient Data

LIST OF APPENDICES
Appendix A SMCHS-GPP Letter Dated April 9, 2013 and February 19, 2014 and SMCHS-GPP Meeting Notes Dated June 11, 2013
Appendix B Revised Site Management Plan dated May 31, 2013 Appendix C Empirical Data Supporting Groundwater Benzene Concentration Exclusion Criteria for Petroleum Vapor Intrusions Investigations dated June 2011

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
Introduction
July 8, 2014
bm v:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\05_report_deliv\deliverables\reports\2014\306441_revised_rap_fnl_07082014.docx 1

1.0 Introduction
Stantec Consulting Services Inc. (Stantec) on behalf of Chevron Environmental Management Company (EMC), presents this Revised Remedial Action Plan (R-RAP) for Chevron Facility 306441 (Former Unocal No. 6980) located at 190-192 El Camino Real, South San Francisco, California, Assessor’s Parcel Number 014-183-110 (the ‘Site’, Figure 1). The R-RAP was not requested by the San Mateo County Health System – Groundwater Protection Program (SMCHS-GPP), but is being submitted following discussions with the property owner. The revised scope of work proposed in the R-RAP addresses comments made by the SMCHS-GPP in their letters, dated April 9, 2013 and February 19, 2014, and the meeting between SMCHS-GPP and the property manager (W.T. Mitchell Group) (Appendix A).

This R-RAP withdraws the prior proposed remedy of soil vapor extraction (SVE) and a potential air sparging (AS) option (Stantec, 2013c) and proposes a remedy consisting of soil excavation to address residual hydrocarbon concentrations in soil and to address potential vapor migration in future building A.

The Site is reportedly scheduled for redevelopment (along with the surrounding area), which will involve the demolition of on-Site structures. The scope of work presented in this R-RAP is proposed to be performed by the property owner in conjunction with site redevelopment activities after the on-Site structures are demolished. Currently, site redevelopment activities are anticipated to commence during the first quarter 2015.

2.0 Background

2.1 SITE LOCATION
The Site is located on the southeast corner of the intersection of the El Camino Real and Spruce Avenue, in South San Francisco, California (Figure 2), and is bordered by commercial and retail properties. The Site was formerly occupied by a Union Oil Company of California (Unocal)-branded service station, which ceased operations in 1992. Former station facilities included a sales kiosk, two dispenser islands beneath a shared canopy, a service building (with two service bays and a sales office), and gasoline underground storage tanks (USTs) and associated product lines. The three former gasoline USTs were located south of the dispenser islands. The product dispensers, associated piping, and steel-walled USTs were removed from the Site in April 1992. A Firestone service building, including three service bays and an office, occupied the former location of the former service station building until late 2013/early 2014. The building is now vacant.

This Site is located on the northwestern portion of a property currently owned by Shamain, Incorporated and the owner of the current shopping center is El Camino & Spruce, LLC. Redevelopment of this larger property is reportedly planned, and is being managed by the property manager, W.T. Mitchell Group.

2.2 SITE GEOLOGY
The Site is located approximately one mile south of the base of San Bruno Mountain. Site geology consists of Pleistocene stream channel deposits comprised mostly of gray to brown sand and silt, which locally may contain clay, gravel, or boulders. A subsurface stream channel trends toward the northeast beneath Spruce Avenue. The alluvium lies above the surrounding Quaternary Colma Formation, which in this area consists of mostly yellowish-orange to gray sandy clay and silty sand (Bonilla, 1998). Previous investigations have identified that fill material is present at the Site to approximate depths between 7.5 and 15 feet (ft) below ground surface (bgs).

Historical and recent investigations have indicated that soil in the majority of borings consists mainly of fine-grained materials (silt and clay) extending from near ground surface to depths ranging from 7.0 ft (SB-5) to as deep as 40 ft bgs (SB-7), underlain by alternating layers of coarse-grained (sand/silty, sand/clayey, and sand) and fine-grained materials (silt/clay) to the maximum depth explored (65 ft bgs, MW-1). These coarse-grained and fine-grained strata appear to be relatively laterally continuous across the majority of the Site, with increased interbedding in the areas of borings MW-1/MW-1R and MW-2.

Fill consisting mainly of fine-grained material was documented in previous boring logs to depths of approximately 7.5 to 15 ft bgs. Soil deeper than approximately 40 ft bgs consisted predominantly of coarse-grained sediments (sand/silty sand/mixtures of gravel) to the maximum explored depth. Geologic cross sections are presented on Figure 3.

2.3 SITE HYDROGEOLOGY
With the exception of one boring where groundwater was not encountered (SB-13), first groundwater was present mainly within coarse-grained sediments (sand/silty sand) or fine-grained materials (sandy silt/silt) in borings MW-7, SB-3, SB-4, and SB-6 through SB-8 at depths between approximately 30 ft and

57.5 ft bgs. Static groundwater levels within wells completed with shallower screens (MW-1R, MW-3R, and MW-7 through MW-10) have historically ranged from 21.47 (MW-10) ft below top of casing (ft btoc) to approximately 35.83 ft btoc (MW-7).

The direction of groundwater flow prior to 2012 has ranged from west to south-southwest with an average gradient of approximately 0.029 feet per foot (ft/ft). The direction of groundwater flow measured between January 2012 and January 2013 has been to the southeast with an average gradient of approximately 0.053 ft/ft. The hydraulic gradient over the course of groundwater monitoring from May 1994 to January 2013 has averaged approximately 0.031 ft/ft. Based upon an evaluation of moisture content and stratigraphy encountered at and above the water table, groundwater appears to be present under unconfined conditions. A perched groundwater zone beneath the Site was identified approximately 5 to 11.5 ft bgs and is thought to be related to the fill/native soil interface and/or the storm drain north of the Site (Stantec, 2012). Historical groundwater monitoring and analytical data can be found in Table 2 and historical groundwater gradient data is presented as Table 4.

2.4 BENEFICIAL USES OF GROUNDWATER AND SURFACE WATER
As indicated above, the nearest surface water bodies in the Site vicinity are an unnamed tributary to Colma Creek (approximately 1,200 ft northeast of the Site) and Colma Creek (approximately 3,200 ft northeast of the Site). A subsurface channel within a culvert along the north/northeast edge of the Site likely connects to the unnamed tributary to Colma Creek.

The California Regional Quality Control Board (CRWQCB) – San Francisco Bay Region has summarized the existing and potential uses of surface water and groundwater in the Site vicinity in their San Francisco Bay Basin (Region 2) Water Quality Control Plan (Basin Plan, CRWQCB, 2013). According to the Basin Plan, the Site is located within the South Bay Basin for surface waters. The Basin Plan states that there are existing beneficial uses of surface water within Colma Creek in support of warm fresh water habitats, wildlife habitats, and recreational purposes (water contact and no-water contact). Also according to the Basin Plan, the Site is situated in the Westside D groundwater basin. This basin has been designated as having existing beneficial uses for municipal and domestic, industrial process, and industrial service water supply, and potentially beneficial uses for agricultural water supply.

2.5 PREVIOUS WORK
A detailed summary of previous work performed at the site is provided in Stantec’s Revised Site Management Plan (Stantec, 2013b) and included in Appendix B. Historical soil analytical data is included as Table 1, historical groundwater monitoring and analytical data is included as Table 2, historical soil vapor analytical data is included as Table 3, and historical groundwater gradient data is included as Table 4.

2.6 GROUNDWATER MONITORING AND SAMPLING HISTORY
Groundwater monitoring has been performed at the Site since 1993. Monitoring and sampling was initially performed monthly in 1993, and was reduced to quarterly from this time until monitoring and sampling was suspended by Gettler Ryan (GR) following the May 2000 event. ENSR reinstated the monitoring and sampling program in October 2003, which was generally conducted semi-annually until wells MW-1 through MW-3, MW-5 and MW-6 were destroyed on October 17, 2011.

The current well network consists of MW-1RA, MW-3RA and MW-7 through MW-10. These wells are gauged semi-annually during the first and third quarters. Wells MW-1RA and MW-3RA were installed in January/February 2013 to replace wells MW-1R and MW-3R (Stantec, 2013a), and well MW-10 was installed in 2012 as detailed in Stantec’s Well Installation Report, dated November 27, 2012 (Stantec, 2012). Currently, wells MW-1RA, MW-3RA, and MW-10 are sampled semi-annually and wells MW-7 through MW-9 are sampled annually during the third quarter. Monitoring and sampling of the wells is currently performed by GR, and consists of groundwater elevation gauging, sample collection, and chemical analysis of samples. Groundwater samples are analyzed for total petroleum hydrocarbons – gasoline range organics (TPH-g), benzene, toluene, ethylbenzene, and total xylenes (collectively BTEX), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), ethanol, methyl tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME), and tertiary butyl alcohol (TBA) by United States Environmental Protection Agency (USEPA) Method 8260B.

2.7 SENSITIVE RECEPTORS
In a letter dated March 6, 1997, Kaprealian Engineering Incorporated (KEI) presented the results of a ¼- mile radius well survey. Based upon a search of files at the Department of Water Resources (DWR), one potential water supply well used for irrigation was identified at the Golden Gate National Cemetery, located south of the Site (KEI, 1997). The well was installed in 1960 with a screen extending greater than 200 ft bgs. Its location and status were not verified, and it was noted that the majority of the cemetery was located beyond the quarter-mile search radius with a portion of the property closest to the Site, located approximately 800 ft to the south.

In response to SMCHS-GPP’s January 13, 2005 letter, ENSR contacted the Golden Gate Cemetery to investigate the status and location of the irrigation well, identified during the well survey performed by KEI in 1997. The director indicated that four irrigation wells existed on the cemetery property. One of the wells had been decommissioned due to the construction of a building at its location. The other three were no longer used due to silting problems and/or saltwater intrusion. At the time of the report (ENSR, 2006), the director of the Golden Gate Cemetery indicated that there were no plans to decommission the remaining three wells. A map obtained from cemetery personnel indicated that the closest of the existing irrigation wells was located approximately 2,200 ft in the cross-gradient/down-gradient direction. Based upon the location of the closest well, and that the remaining irrigation wells on the property were not in use, ENSR concluded that dissolved petroleum hydrocarbons potentially emanating from the Site were not likely to impact these receptors, and pose a risk to human health (ENSR, 2006).

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
Background
July 8, 2014
bm v:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\05_report_deliv\deliverables\reports\2014\306441_revised_rap_fnl_07082014.docx 5 The Site is located approximately 1.6 miles from the San Francisco Bay. The nearest surface water body is an unnamed tributary to Colma Creek, approximately 1,200 ft northeast of the Site. In Unocal’s request for closure (Unocal correspondence dated March 6, 1997), Unocal stated that this tributary is contained within a 66-inch-diameter concrete conduit, which runs along the north/northeast edge of the Site at a depth of 20 ft bgs. As indicated by the SMCHS-GPP (letter dated February 14, 2011), a topographic map shows that this tributary connects to Colma Creek (approximately 3,200 ft to the northeast). Stantec obtained a storm water/sewer map from the City of South San Francisco, which confirmed the presence of this conduit (Figure 2); the map indicated that the depth of the storm drain ranged from approximately 3 ft northeast of the site to 15 ft west of the site. This conduit is located beneath Spruce Avenue, bordering the Site to the north/northwest.

2.8 REMEDIAL AND PILOT TEST HISTORY
In July 1992, over-excavation and additional assessment of subsurface conditions was performed beneath and in the vicinity of the south/southeastern portion of the fuel UST pit; and additional excavation was performed approximately 3 ft laterally beyond the north-northwestern fuel UST excavation limits in the vicinity of sample SW2, and beneath initial product line samples P2 and P4. An additional 7.5 ft of hydrocarbon-impacted soil was excavated from the bottom of the fuel UST pit beneath samples A2 through C2 to a maximum depth of 21 ft bgs, and confirmation soil samples were collected from this area (A2[21], B2[21], and C2[21]). A confirmation sidewall sample was collected from the excavation expanded laterally beyond SW2 (SW2[3]), and an additional sample (BS[16]) was collected approximately 17 ft southeast of fuel UST excavation sampling point C2 to further characterize soil to the southeast. The dimensions of additional excavation in the vicinity of product line sample P2 were approximately 12 ft by 12 ft by 12 ft deep, and confirmation samples were collected from the base (P2[12]) and sidewalls (P2[SW1 through SW3]). The dimensions of additional excavation in the vicinity of product line sample P4 were approximately 15 ft by 18 ft by 8.5 ft deep, and confirmation samples were also collected in this area from the base (P4[8.5]) and sidewalls (P4[SW1 through SW3]). Based on the results of this investigation, KEI concluded that the majority of petroleum hydrocarbon-impacted soil had been removed from the Site, with the highest residual concentrations limited to the southeastern corner of the fuel USTs (KEI, 1992a).

A total of approximately 350 cubic yards of soil (approximately 200 cubic yards from the fuel UST pit, an additional 100 cubic yards combined from the fuel UST excavation and product line trench excavations, and approximately 50 cubic yards from the pump islands) were removed from the Site (KEI, 1992b).

Between January 24 and February 1, 2013, Stantec destroyed two groundwater monitoring wells (MW-1R and MW-3R) and installed one deep SVE well (SVE-1D), one shallow SVE well (SVE-2S), four observation wells (OBS-1 through OBS-4), and two replacement groundwater monitoring wells (MW-1RA and MW3RA). In addition to functioning as replacement groundwater monitoring wells, MW-1RA and MW-3RA were used as observation wells for pilot test activities (Stantec, 2013a).

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
Background
July 8, 2014
bm v:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\05_report_deliv\deliverables\reports\2014\306441_revised_rap_fnl_07082014.docx 6  Radius of influence was determined to be up to approximately 36 ft for SVE-2S and 15 ft for SVE-1D.
 Based on concentrations of organic lead in the extracted vapor, the estimated life of a catalyst cell (if used) would be less than two days; however, there may be pre-treatment alternatives that still allow for the use of a catalytic oxidizer. Sulfur concentrations could be managed by increasing operating temperatures.
 SVE is likely an effective technology for the remediation of residual petroleum hydrocarbon impacts to subsurface soil at the Site.
 The pilot test report recommended the implementation of a vapor mitigation system beneath the Building A footprint.

Stantec recommended a full-scale SVE system, including a potential AS option, be installed and operated at the Site (Stantec, 2013a). Based on discussions with the land owner, Stantec is withdrawing the recommendation for a full-scale SVE and AS system and proposing soil excavation as the remedy for the Site.

3.0 Remedial Action Objectives
Near the end of 2007, W.T. Mitchell Group informed the SMCHS-GPP of plans to redevelop the property.

In e-mail correspondence, dated December 3, 2007, the SMCHS-GPP informed the W.T. Mitchell Group that project approval could not be recommended until the risk to potential hypothetical future residents could be assessed, and the proposed development would not affect potential remediation efforts. Since then, EMC has evaluated risks to future occupants of the two buildings (Building A and Building B) proposed for the former service station site. SMCHS-GPP, in a letter dated August 6, 2012, has concurred that the results of this study indicate that residual petroleum impacts do not present unacceptable health risks to future occupants of proposed Building B. Therefore, the primary remedial objective is to reduce potential exposure to residual hydrocarbons remaining below the footprint of future Building A to a level of insignificance.

The remedial objectives as they relate to the screening criteria set forth in the State Water Resources Control Board (SWRCB) Low-Threat Underground Storage Tank Case Closure Policy (LTCP) are as follows:
 General Criteria: All general criteria are identified as complete with the exception of secondary source removal. Therefore, secondary source removal has been identified as a remedial objective.  Groundwater Media-Specific Criteria: Although the SMCHS-GPP currently identify this criteria as not satisfied, Stantec presents an argument for why this criteria is satisfied in Section 6.0.

Therefore, no remedial objectives with respect to groundwater cleanup are warranted.  Petroleum Vapor Intrusion to Indoor Air Media-Specific Criteria: This criterion is not met based on historical soil gas sampling data. Soil vapor data from shallow vapor probes installed at the site exceeded LTCP soil gas criteria (commercial soil gas criteria with no bioattenuation zone) at SV-2, SV-3, SV-4, and SV-9. As a result, remedial objectives consist of excavating hydrocarbon-impacted soil to satisfy LTCP soil gas criteria for commercial use at the Site. In order to satisfy this criterion, Stantec proposes to excavate hydrocarbon-impacted soil exceeding 1,000 mg/kg TPHg to a maximum depth of 20 ft bgs. Further explanation of the proposed remedial extent is provided in Section 4.1. Excavation of impacted soil to a maximum depth of 20 ft will satisfy the criteria as demonstrated by an empirical study presented at Battelle in June 2011, concluding that there is no elevated risk for vapor migration if there is clean backfill to 15 ft (Peargin and Kolhatkar, 2011).

Transport distances for benzene exceeding 300 micrograms per cubic meter did not exceed 15 ft (Peargin and Kolhatkar, 2011). Empirical study data is included at Appendix C. Should post excavation soil vapor sampling identify vapor concentrations that exceed commercial LTCP soil gas criteria, the R-RAP proposes that an additional mitigation measure (vapor barrier and/or sub-slab depressurization system) be installed as part of new construction. Design and installation of the mitigation measurewill be the responsibility of the property owner. As stated in the LTCP, this measure alone can satisfy the media-specific criteria for petroleum vapor intrusion to indoor air and be considered low-threat for the vapor-intrusion-to-indoor-air pathway.

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
Remedial Action Objectives
July 8, 2014
bm v:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\05_report_deliv\deliverables\reports\2014\306441_revised_rap_fnl_07082014.docx 8  Direct Contact and Outdoor Air Exposure Media-Specific Criteria: This criteria has been identified as met per the SMCGH-GPP LTCP checklist in GeoTracker.

4.0 Excavation
Stantec proposes soil excavation for onsite remediation, based on discussions with W.T. Mitchell Group.

Source area excavation would involve removal, off-site disposal of impacted soils and backfill with clean soil during redevelopment and prior to construction of proposed Building A.

Source area impacted soil in the shallow unsaturated zone exists near or north/northeast of the former fuel USTs in the vicinity of the previously excavated areas of the former dispenser islands, and beyond these areas beneath the northern portion of the site. The excavation will be performed before the property owner’s planned construction of future Building A. As part of the redevelopment, the property owner intends to remove the surface structure at which point a targeted excavation of source area impacted soil beneath and around the future projected Building A is proposed to be implemented as part of site redevelopment.

4.1 DETERMINATION OF EXCAVATION LIMITS
As stated in Section 3.0, the remedial objectives of the excavation are to reduce potential vapor migration to future Building A to levels that would have no significant risk. Historically, elevated (exceeding screening levels at 5 ft bgs) vapor concentrations were measured at vapor probes SV-2, SV-3, SV-4, and SV-9. As a result, the soil in the vicinity of these vapor probes and areas of known impacted soil are proposed to be excavated. Figures 4 and 5 show the historical maximum TPH-g and benzene soil concentrations measured from 0 to 20 ft bgs and concentration isocontours. As discussed previously in Section 3.0, a maximum excavation target depth of 20 ft bgs is proposed to meet the remedial objectives.

The excavation targets any TPH-g soil impacts exceeding 1,000 mg/kg as shown on Figure 6. However, given the location of benzene impacts, the proposed excavation limits will also target removal of elevated benzene concentrations as shown on Figure 7. Given the need to slope the excavation sidewalls a 1:1 slope to reach the target 20 ft excavation depth, most of the soil exceeding 100 mg/kg TPH-g will be removed as well. A sidewall view of the proposed excavation is shown on the cross sections provided on Figure 3.

Approximately 3,880 cubic yards or 6,286 tons of soil is proposed to be excavated based on TPH-g isocontours for unsaturated soil at 0-20 ft bgs.

Based on amount of space available on all sides of the excavation, a 1:1 (H:V) or 2:1 (H:V) sloping will be performed, which will eliminate the need to implement an engineered shoring design. Generally a 1:1 (H:V) sloping is acceptable for a Type B soil which has an unconfined compressive strength of 0.5 to 1.5 tons per square feet. In order to be conservative a 2:1 (H:V) could be potentially used. Type B soil is typical cohesive soil-clay and silty.

4.2 PERMITTING
Necessary permits for excavation activities shall be obtained prior to start of construction. Based on the selected remediation method, the following permits may be required for the proposed excavation:

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
Excavation
July 8, 2014
bm v:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\05_report_deliv\deliverables\reports\2014\306441_revised_rap_fnl_07082014.docx 10  SMCHS - GPP well destruction permits for all onsite wells.  City of South San Francisco Planning and Development Department permits for grading, excavation, and sloping.
 City of South San Francisco Public Works Department permit for truck staging and traffic routes.  A California Department of Transportation (Caltrans) permit for encroachment for truck transportation on El Camino Real (as necessary).
 Pacific Gas and Electric service request to disconnect electrical and natural gas service and any other utilities that are encountered in the excavation footprint.  Bay Area Air Quality Management District (BAAQMD) Permit for any potential air quality impacts as necessary.

It is possible that additional permits may be required.

All the permits except the well destruction permits will be responsibility of the land owner or its contractor. Stantec will apply for the well destruction permits from SMCHS - GPP.

4.3 SITE HEALTH AND SAFETY PLAN
As required by the Occupational Health and Safety Administration Standard “Hazardous Waste Operations and Emergency Response” guidelines (29 CFR 1910.120), and by the California Occupational Health and Safety Administration “Hazardous Waste Operations and Emergency Response” guidelines (CCR Title 8, Section 5192), a site-specific Health and Safety Plan (HASP) will be created prior to the commencement of fieldwork. The HASP will be reviewed by field staff and contractors before beginning field operations, and will be in the possession of field staff personnel while conducting work at the site.

4.4 SCOPE OF WORK PHASE I– WELL DESTRUCTION

4.4.1 Subsurface Utility Clearance
Prior to scheduled field work activities, Stantec will mark the extent of the proposed excavation in accordance with Underground Services Alert (USA) guidelines. Stantec will contact USA North at least two days prior to the start of field work to allow USA members to mark out subsurface utility locations.

Additionally, Stantec will contact a private utility locator to verify the locations of marked USA member utility lines and investigate the presence of utility lines that are not owned or operated by USA members.

Additionally, Stantec will confirm the locations of onsite utilities with the property owner and their status at the end of the owner’s site demolition.

4.4.2 Well Destruction
Prior to the proposed excavation, Stantec will supervise the destruction of all monitoring wells, remedial wells and soil vapor wells located on-site (MW-1RA, MW-3RA, MW-7 through MW-10, SV-2 through SV-9, SVE-1D, SVE-2S, and OBS-1 through OBS-4). The monitoring and remedial wells will be pressure grouted by introducing neat grout cement (mixed at a ratio of 6 gallons of water per 94 pounds of Portland cement) via a tremmie into the well and applying a pressure of 25 pounds per square inch for a period of at least 5 minutes. For the soil vapor wells, wells located inside the footprint of the proposed excavation (SV-2, SV-3, SV-4, SV-7, and SV-9), all associated well materials will be removed during excavation activities; soil vapor wells SV-5, SV-6, and SV-8 will be overdrilled with a hand auger to remove the well materials since the construction of these wells prevents the injection of neat cement grout for pressure grout destruction.

4.5 SCOPE OF WORK PHASE II– EXCAVATION

4.5.1 Storm Water Pollution Prevention Plan
A Storm Water Pollution Prevention Plan (SWPPP) will be submitted to the City of South San Francisco.

Details for storm water pollution prevention will be included as part of the excavation permitting process.

Submitting and implementing the SWPPP is the responsibility of the land owner.

4.5.2 Excavation Shoring/Sloping
Due to ample space around the proposed excavation extent, Stantec proposes to slope the excavation. A typical Type B soil requires 1:1 (H:V) sloping. Sloping of the excavation will have the additional benefit of targeting the 100 mg/kg TPH-g contour concentration in the shallow zone and will capture a large percentage of impacts within the footprint of Building A. The sloping design and permitting requirements shall be fulfilled and performed by the land owner. Sloping of the excavation is as shown in Figure 3.

4.5.3 Soil Sampling and Analysis
The collection of confirmation soil samples does not appear warranted as the extent of the excavation has been determined by historical soil data. The historically collected soil data n adequately assesses the limits of the excavation. Soil samples will be collected from the excavated soil to profile the soil for offsite disposal. The soil samples will be analyzed in accordance with the profiling requirements of the waste disposal facility.

4.5.4 Soil and Groundwater Management
The excavated soil will be stockpiled and/or loaded onto trucks for off-haul and disposal. Soils that require stockpiling will be placed on 6-millimeter plastic sheets, and then covered with additional plastic sheeting held down by sand bags. Berms will be placed around the stockpiled soil to prevent surface runoff of impacted water. Any run-off water will be contained in the onsite groundwater collection container as discussed below. Due to the historical range in depth to water (31-49 ft bgs) in the site monitoring

At the end of the excavation, all the pumped water shall be vacuumed out and disposed of appropriately after profiling.

Given the reported concentrations of petroleum hydrocarbons in soil, Stantec anticipates that petroleum hydrocarbon vapors may be present at elevated concentrations in the excavation. For the safety of the workers and the human population surrounding the area, Stantec will monitor the vapor concentrations, and properly manage acceptable exposure. Stantec’s previously submitted revised site management plan (2013b) is included as Appendix B. Excavated soil will be removed from the site and transported by a licensed disposal contractor to an appropriate disposal facility.

4.5.5 Site Grading
Backfill and compaction will be performed per the planning and grading permit obtained by the landowner. The permit will be obtained before the start of the redevelopment activities. Site grading will be performed in accordance with City of South San Francisco requirements. Grading conditions might change depending on the actual earthwork and subsurface conditions. The excavated pit shall be regularly inspected in accordance with City of South San Francisco inspection requirements indicated during building and planning permit review process. Excavations created by removing underground structures, construction debris, vegetation roots, contaminated soils, and any other unsuitable materials will be backfilled with clean fill soil and properly compacted to 95% of relative proctor density at minimum or identified during the permitting process and/or as per the Geotechnical Report prepared by W.T. Mitchell Group as part of their construction permit application with the City of South San Francisco.

4.5.6 Vapor Mitigation System Installation
As previously mentioned in Section 3.2, Peargin and Kolhatkar 2001 Emperical study in Appendix C indicates there is no elevated risk for vapor migration if there is clean backfill of 15 feet. The proposed source area soil excavation beneath the proposed building A is down to 20 ft bgs. Should post excavation soil vapor sampling (discussed below in Section 5.0) identify vapor concentrations that exceed commercial LTCP soil gas criteria, then the inclusion of vapor control measures (i.e. a vapor barrier and/or a sub-slab depressurization system) in the construction of building A will be considered. Design and installation of the vapor mitigation system will be the responsibility of the property owner.

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
Post Remediation Monitoring
July 8, 2014
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5.0 Post Remediation Monitoring
Once the excavation is performed, thus removing the secondary source to the extent practical, the Site is expected to meet LTCP closure requirements. The remediation success criteria is no significant vapor migration to future building A. To measure this success criteria, Stantec proposes to install four temporary vapor probes within the proposed Building A footprint at depth of 5 ft bgs as shown in Figure

2. Soil vapor probe SV-11 is proposed near the vicinity of SV-3, which historically has had high vapor concentrations at 5 ft bgs. Soil vapor probes SV-12 and SV-13 are proposed in the vicinity of destroyed wells MW-3 and MW-1, respectively, which have shown historical elevated soil impacts. Soil vapor probe SV-10 is proposed at the northern end of the future Building A due to the shallow soil impacts historically measured in this area. Stantec will submit a work plan under separate cover providing details of the vapor probe construction and sampling. The results of the vapor sampling will be compared to LTCP soil gas criteria.

6.0 Post Remediation Groundwater Monitoring
After the completion of remedial action via excavation at the site, Stantec does not propose to re-install groundwater monitoring wells. Based on a review of onsite and offsite site conditions, Stantec believes that the site meets Groundwater Media-Specific Criteria Scenario 3 of the SWRCB LTCP, as discussed below. In order to qualify for Groundwater Media-Specific Criteria Scenario 3, the following site conditions must be met:
 The contaminant plume that exceeds water quality objectives is less than 250 ft in length.  Free product has been removed to the maximum extent practicable, may still be present below the site where the release originated, but does not extend offsite.  The plume has been stable or decreasing for a minimum of five years.  The nearest water supply well or surface water body is greater than 1,000 ft from the defined plume boundary (discussed further below).
 The property owner is willing to accept a land use restriction if the regulatory agency requires a land use restriction as a condition of closure.

In the LTCP Checklist dated February 19, 2014 on the State of California GeoTracker database, SMCHSGPP has listed the following site conditions under the Groundwater Media-Specific Criteria:
 The dissolved phase petroleum hydrocarbon plume length is ≥100 ft and <250 feet.  The dissolved phase benzene concentrations in site wells have been reported at a maximum concentration that is ≥3,000 micrograms per liter (µg/L).  The dissolved phase MTBE concentrations in the site wells have been reported at a maximum concentration that is ≥1,000 µg/L.
 The nearest surface water body is ≤250 ft from the plume boundary.

Using the SMCHS-GPP review of the site conditions as presented in the LTCP Checklist on GeoTracker, Stantec believes that the site qualifies for Groundwater Media-Specific Criteria Scenario 3 based on plume length and the absence of free product at the site. In the Third Quarter 2013 Annual Groundwater Monitoring Report, dated November 15, 2013, Stantec presented graphs illustrating dissolved-phase TPH-GRO, benzene, and MTBE concentrations versus time for well pairs MW-1R/MW-1RA and MW3R/MW-3RA (Stantec, 2013d). Wells MW-1R and MW-3R were installed and first sampled in March 2010 and were destroyed in January 2013 in advance of a proposed remediation pilot test at the site.

Replacement wells MW-1RA and MW-3RA (constructed to the same depth as wells MW-1R and MW-3R with a longer screen interval and with 4-inch diameter casing instead of 2-inch diameter casing) were installed in January 2013 and were first sampled in July 2013. Groundwater monitoring and sampling of these well pairs has been effectively performed on a semiannual basis between 2010 and 2014. The graphs illustrate that over the past 4 years, dissolved-phase petroleum hydrocarbon concentrations in the heart of the plume have remained stable to decreasing. Stantec will present the results of the first quarter 2014 and third quarter 2014 sampling at the site by November 15, 2014, and do not anticipate a deviation from the trend observed over the past four years; if this is found to be true, site conditions will satisfy bullet point three of Groundwater Media-Specific Criteria Scenario 3.

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
Post Remediation Groundwater Monitoring
July 8, 2014
bm v:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\05_report_deliv\deliverables\reports\2014\306441_revised_rap_fnl_07082014.docx 15 The surface water body identified by SMCHS-GPP as being ≤250 from the plume boundary is the storm drain that traverses the northern portion of the site boundary. This public utility has been identified as a potential receptor because it appears to daylight at a distance of approximately 1,200 ft northeast of the site on Spruce Avenue. Stantec has created a cross-section of the subsurface between the site and the open ditch that crosses Spruce Avenue (Figure 8) using the following information:
 Surface elevations taken from a topographic map of the area,  Average groundwater elevations at the site during the first quarter 2014,  Average groundwater elevations at the open Leaking Underground Tank (LUST) Cleanup Site T0608100512 (Spruce Car Wash) located at 246 South Spruce Avenue during the first quarter 2014 (information available on the State of California GeoTracker database, http://geotracker.waterboards.ca.gov/profile_report.asp?global_id=T0608100512). This site is located on Spruce Avenue the opposite side of the open ditch.  A map obtained from the City of South San Francisco identifying the locations and depth of the storm drain system surrounding the site, and
 An interview with Mr. Kelvin Munar with the City of South San Francisco, Engineering Division.

The open ditch that crosses Spruce Avenue northeast of the site is a drainage culvert that diverts storm drain water from the subdivision north of Spruce Avenue to the rest of the storm drain system that eventually diverts water to the San Francisco Bay. This open ditch was constructed above the subterranean Bay Area Rapid Transit (BART) line that runs down the San Mateo peninsula from San Francisco. Based on a review of average groundwater elevations, surface elevations, and invert (bottom) of the storm drain elevations, Figure 8 illustrates that the groundwater does not intersect the storm drain within a distance of at least 2,000 ft away from the boundary of the dissolved phase hydrocarbon plume; therefore the storm drain should not be considered a surface water body receptor in close proximity (i.e. ≤1,000 feet) of the site, and the site conditions satisfy bullet point four of Groundwater Media-Specific Criteria Scenario 3.

Because of the planned remedial action by excavation to address the potential risk to the occupants of the proposed new commercial building at the site from vapor migration and the expectation that site use will not change for the foreseeable future, a land use restriction (bullet point five of Groundwater MediaSpecific Criteria Scenario 3) should not be necessary for case closure at the site.

Stantec concludes that the site satisfies the SWRCB LTCP Groundwater Media-Specific Criteria Scenario 3 and does not recommend further groundwater monitoring and sampling after the completion of remedial action at the site.

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
Reporting and Schedule
July 8, 2014
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7.0 Reporting and Schedule

7.1 REPORTING
Stantec will submit an excavation report to SMCHS-GPP, once the excavation is complete and the excavated soil is disposed. Stantec will also submit a work plan for soil vapor probe installation following the approval of this R-RAP. Once soil vapor samples are collected, results analyzed and the results are below LTCP criteria, Stantec will submit a request for closure.

7.2 SCHEDULE
Upon approval by SMCHS-GPP, the activities outlined in previous sections shall be initiated according to the following schedule, dependent upon redevelopment progress at the site:

The excavation activities, including construction request for proposal, bid walks with contractors for site access, development of site specific health and safety plan, and permits and construction starts date shall comply with the following schedule:

Construction Activity Timeline (pending regulatory approval) 1-Excavation construction activity pre-planning
and site management plan
Pending regulatory approval
2-Submit Permits application to the City of South
San Francisco
2-4 months, varies, Responsibility of land owner
3-Receive Approved Building Permit from the City
of South San Francisco
2-4 months after activity 2, Responsibility of land
owner
4-Excavation construction activity start Pending regulatory approval and once land owner has obtained all the permits and demolished all onsite structures 5-Submit Excavation report and work plan for
vapor probe(s) installation
Within two months of finalization of Activity 4
Well Installation Activities Timeline (pending regulatory approval) 1- Obtain well permits from SMCHS-GPP and
confirm access from property owner.

Within two weeks of regulatory and property owner
approval
2-Well destruction activities for onsite monitoring
wells Within four weeks of Activity 1

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
Limitations and Certification
July 8, 2014
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8.0 Limitations and Certification
This report was prepared in accordance with the scope of work outlined in Stantec’s contract and with generally accepted professional environmental consulting practices existing at the time this report was prepared and applicable to the location of the site. It was prepared for the exclusive use of EMC, for the express purpose stated above. Any re-use of this report for a different purpose or by others not identified above shall be at the user’s sole risk without liability to Stantec. To the extent that this report is based on information provided to Stantec by third parties, Stantec may have made efforts to verify this third party information, but Stantec cannot guarantee the completeness or accuracy of this information. The opinions expressed and data collected are based on the conditions of the site existing at the time of the field investigation. No other warranties, expressed or implied are made by Stantec.

Prepared By: Reviewed By:

Aparjeet Rangi Matthew Battin
Engineering Associate Associate Scientist
Information, conclusions, and recommendations provided by Stantec in this document have been prepared under the supervision of and reviewed by the licensed professional whose signature appears below.

Name: Adrian Pérez, P.E. Signature:

Senior Engineer
Date: July 8, 2014 Stamp:
c. Mr. Eric Hetrick, EMC (via electronic upload to Strata) Mr. William T. Mitchell (Property Manager), W.T. Mitchell Group, P.O. Box 5127, Walnut Creek, CA 94596

REVISED REMEDIAL ACTION PLAN
Chevron 306441 (Former Unocal No. 6980)
References Cited
July 8, 2014
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9.0 References Cited
Bonilla, M.G., 1998, Preliminary geologic map of the San Francisco South 7.5' quadrangle and part of the Hunters Point 7.5' quadrangle, San Francisco Bay area, California: A digital database: U.S.

Geological Survey Open-File Report 98-354. Access at: http://geonsdi.er.usgs.gov/metadata/open-file/98-354/metadata.faq.html California Regional Water Quality Control Board - San Francisco Bay Region. 2013. San Francisco Bay Basin (Region 2) Water Quality Control Plan (Basin Plan), Incorporating All Amendments Approved by the Office of Administrative Law as of June 29, 2013.

ENSR Corporation, 2006. Report of Well Installation and Additional Subsurface Assessment, Former Unocal Service Station No. 6980 (Chevron No. 306441), 190-192 El Camino Real, South San Francisco, California. November.

Kaprealian Engineering Incorporated. 1992a. Soil Sampling Report, Former Unocal Service Station #6980, 192 El Camino Real, South San Francisco, California. November 9.

Kaprealian Engineering Incorporated. 1992b. Stockpiled Soil Sampling and Disposal Report for, Former Unocal Service Station #6980, 192 El Camino Real, South San Francisco, California. November 9.

Kaprealian Engineering Incorporated. 1997. Report of ¼-Mile Radius Well Survey, Former Unocal Service Station #6980, 192 El Camino Real, South San Francisco, California. March 6.

Stantec Consulting Services Inc. 2012. Well Installation Report, Former Unocal Station #6980 (Chevron Facility #306441), 190-192 El Camino Real, South San Francisco, California. November 27.

Stantec Consulting Services Inc. 2013a. Well Installation and Soil Vapor Extraction Pilot Test Report, Former Unocal Station #6980 (Chevron Facility #306441), 190-192 El Camino Real, South San Francisco, California. March 22.

Stantec Consulting Services Inc. 2013b. Revised Site Management Plan, Former Unocal Station #6980 (Chevron Facility #306441), 190-192 El Camino Real, South San Francisco, California. May 31.

Stantec Consulting Services Inc. 2013c. Remedial Action Plan, Chevron 306441 (Former Unocal No. 6980), 190-192 El Camino Real, South San Francisco, California. July 2.

Stantec Consulting Services Inc. 2013d. Third Quarter 2013 Annual Groundwater Monitoring Report, Chevron 306441 (Former Unocal No. 6980), 190-192 El Camino Real, South San Francisco, California, San Mateo County Case No. 550098. November 15.

Tom Peargin and Ravi Kolhatkar. 2011. Empirical Data Supporting Groundwater Benzene Concentration Exclusion Criteria for Petroleum Vapor Intrusion Investigations. June.

FIGURES
SITE
6000
1 SCALE (FEET)
2000SCALE (MILES)
1/2
1000 0 1000 3000 4000
0 5000 7000
REFERENCE: USGS 7.5 MINUTE QUADRANGLE, SAN FRANCISCO, SOUTH, CALIFORNIA 1 DB 05/06/11
SITE LOCATION MAP 1
FOR:

JOB NUMBER: DRAWN BY: CHECKED BY: APPROVED BY: DATE:

FIGURE:

FILEPATH:M:\CHEVRON\306441\FIG 1-SITE LOCATION MAP.dwg|miramirez|Nov 08, 2013 at 14:28|Layout: Layout1 211602175 MDR AB
CHEVRON 306441
(FORMER UNOCAL NO. 6980)
190-192 EL CAMINO REAL

SOUTH SAN FRANCISCO, CALIFORNIA

TABLES
Sample
Name Lead 3
(mg/kg)
Excavation Soil SamplingGasoline UST PitA1 04/08/92 13.5 <1.0 0.011 <0.0050 <0.0050 <0.0050 -- -- -- -- -- -- -- -- -- -- A2 04/08/92 a 13.5 190 2.4 5.5 4.1 26 -- -- -- -- -- -- -- -- -- -- A2 (21) 07/02/92 21.0 6.6 0.58 0.062 0.27 0.55 -- -- -- -- -- -- -- -- -- --B1 04/08/92 13.5 16 0.26 0.038 0.053 0.21 -- -- -- -- -- -- -- -- -- <0.050B2 04/08/92 a 13.5 990 10 56 16 130 -- -- -- -- -- -- -- -- -- <0.050 B2 (21) 07/02/92 21.0 4.4 0.73 0.016 0.28 0.050 -- -- -- -- -- -- -- -- -- --C1 04/08/92 13.5 6.3 0.060 0.017 0.019 0.028 -- -- -- -- -- -- -- -- -- --C2 04/08/92 a 13.5 1,300 8.3 45 13 90 -- -- -- -- -- -- -- -- -- -- C2 (21) 07/02/92 21.0 340 0.92 5.9 4.0 32 -- -- -- -- -- -- -- -- -- --SW1 04/08/92 12.5 1.6 0.0090 0.0059 <0.0050 0.013 -- -- -- -- -- -- -- -- -- <0.050SW2 04/08/92 a 12.5 82 1.4 0.60 0.28 1.0 -- -- -- -- -- -- -- -- -- -- SW2 (3) 07/02/92 12.5 4.5 0.012 0.0050 0.011 0.0094 -- -- -- -- -- -- -- -- -- --SW3 04/08/92 12.5 15 0.46 0.046 0.027 0.20 -- -- -- -- -- -- -- -- -- <0.050SW4 04/08/92 12.5 19 0.29 0.32 0.32 2.2 -- -- -- -- -- -- -- -- -- --B5 (16) 07/02/92 16.0 4.0 0.033 0.032 0.018 0.084 -- -- -- -- -- -- -- -- -- --Product Pipeline TrenchesP1 04/07/92 3.5 67 0.13 0.039 0.50 2.7 -- -- -- -- -- -- -- -- -- <0.050P1-1 04/07/92 3.5 1.2 <0.0050 0.0072 <0.0050 0.0074 -- -- -- -- -- -- -- -- -- --P2 04/07/92 a 3.5 2,100 16 12 15 85 -- -- -- -- -- -- -- -- -- -- P2 (12) 07/09/92 12.0 1.0 0.0095 0.0069 0.0077 0.019 -- -- -- -- -- -- -- -- -- --P2 (SW1) 07/09/92 8.0 <1.0 0.012 <0.0050 0.015 0.033 -- -- -- -- -- -- -- -- -- -- P2 (SW2) 07/09/92 8.0 6.0 0.035 0.029 0.063 0.24 -- -- -- -- -- -- -- -- -- -- P2 (SW3) 07/09/92 8.0 11 0.16 0.024 0.22 0.12 -- -- -- -- -- -- -- -- -- -- P3 04/07/92 3.5 6.2 0.018 0.013 0.057 1.1 -- -- -- -- -- -- -- -- -- <0.050 P3-3 04/07/92 3.5 11 0.12 0.22 0.21 1.8 -- -- -- -- -- -- -- -- -- P4 04/07/92 a 3.5 12,000 14 41 96 1,100 -- -- -- -- -- -- -- -- -- P4 (8.5) 07/09/92 8.5 7.8 0.040 0.12 0.037 0.24 -- -- -- -- -- -- -- -- -- -- P4 (SW1) 07/09/92 5.0 6.2 <0.0050 0.0088 0.0067 0.044 -- -- -- -- -- -- -- -- -- -- P4 (SW2) 07/09/92 5.0 9.5 0.074 0.041 0.15 0.88 -- -- -- -- -- -- -- -- -- -- P4 (SW3) 07/09/92 5.0 31 <0.0050 0.054 0.032 1.1 -- -- -- -- -- -- -- -- -- --Soil BoringsHA-1 HA-1 3.5' 06/06/06 3.5 2,200 <2.5 4.2 18 120 -- <2.5 -- <2.5 <500 <2.5 -- <2.5 <50 -- HA-2
HA-2 3.5' 06/06/06 3.5 <0.96 <0.0048 <0.0048 <0.0048 <0.0096 -- <0.0048 -- <0.0048 <0.96 <0.0048 -- <0.0048 <0.096 -- (feet, bgs)
Depth Toluene Ethylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 1 1,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
SB-1
SB-1 10' 06/05/06 10.0 2.2 <0.0048 <0.0048 0.037 0.085 -- <0.0048 -- <0.0048 <0.96 <0.0048 -- <0.0048 <0.096 -- SB-1 15.5' 06/05/06 15.5 8,800 <20 43 100 600 -- <20 -- <20 <4,000 <20 -- <20 <400 -- SB-1 18.5' 06/05/06 18.5 11,000 <17 99 130 810 -- <17 -- <17 <3,300 <17 -- <17 <330 -- SB-1 22.5' 06/05/06 22.5 4,300 c <7.1 54 52 310 -- <7.1 -- <7.1 <1,400 <7.1 -- <7.1 <140 -- SB-1 25.5' 06/05/06 25.5 2,600 6.7 41 29 170 -- <5.0 -- <5.0 <1,000 <5.0 -- <5.0 <100 -- SB-1 30' 06/05/06 30.0 260 1.2 5.9 2.5 17 -- <0.42 -- <0.42 <83 <0.42 -- <0.42 <8.3 --SB-1 34' 06/05/06 34.0 220 0.84 4.7 2.2 15 -- <0.42 -- <0.42 <83 <0.42 -- <0.42 <8.3 -- SB-1 37.5' 06/05/06 37.5 6.7 0.28 0.39 0.11 0.76 -- <0.025 -- <0.025 <5.0 0.069 -- <0.025 <0.50 -- SB-2
SB-2 6.5' 06/05/06 6.5 1,500 <2.0 4.2 12 76 -- <2.0 -- <2.0 <400 <2.0 -- <2.0 <40 -- SB-2 10.5' 06/05/06 10.5 2,100 <2.5 <2.5 12 73 -- <2.5 -- <2.5 <500 <2.5 -- <2.5 <50 -- SB-2 17' 06/05/06 17.0 <1.0 0.013 <0.0050 0.013 0.0053 -- <0.0050 -- <0.0050 <1.0 0.0061 -- <0.0050 <0.10 -- SB-2 20.5' 06/05/06 20.5 3.1 0.016 0.011 0.039 0.14 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 -- SB-2 25.5' 06/06/06 25.5 5.1 0.092 0.017 0.077 0.33 -- <0.0047 -- <0.0047 <0.94 0.022 -- <0.0047 <0.094 -- SB-2 29.5' 06/06/06 29.5 <0.96 0.026 <0.0048 <0.0048 <0.0096 -- <0.0048 -- <0.0048 <0.96 0.011 -- <0.0048 <0.096 -- SB-2 33' 06/06/06 33.0 <0.98 0.034 <0.0049 0.0050 <0.0098 -- <0.0049 -- <0.0049 <0.98 0.027 -- <0.0049 <0.098 -- SB-3
SB-3 10.5' 06/06/06 10.5 1.4 c <0.0047 <0.0047 0.0096 <0.0094 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 -- SB-3 14.5' 06/06/06 14.5 1.9 c 0.0062 <0.0045 0.030 0.12 -- <0.0045 -- <0.0045 <0.91 <0.0045 -- <0.0045 <0.091 -- SB-3 21.5' 06/06/06 21.5 22 0.15 <0.025 0.44 1.2 -- <0.025 -- <0.025 <5.0 <0.025 -- <0.025 <0.50 -- SB-3 31.5' 06/06/06 31.5 2.2 d 0.076 <0.0047 0.016 0.031 -- <0.0047 -- <0.0047 <0.94 0.026 -- <0.0047 <0.094 -- SB-3 37' 06/06/06 37.0 1.5 d 0.073 0.0050 0.030 0.10 -- <0.0046 -- <0.0046 <0.93 0.021 -- <0.0046 <0.093 -- SB-4
SB-4 10.5' 06/07/06 10.5 <0.98 <0.0049 <0.0049 <0.0049 0.017 -- <0.0049 -- <0.0049 <0.98 <0.0049 -- <0.0049 <0.098 -- SB-4 20.5' 06/07/06 20.5 <0.94 <0.0047 <0.0047 <0.0047 <0.0094 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 --SB-4 30.5' 06/07/06 30.5 <0.96 <0.0048 <0.0048 <0.0048 <0.0096 -- <0.0048 -- <0.0048 <0.96 <0.0048 -- <0.0048 <0.096 -- SB-5
SB-5 10.5' 06/07/06 10.5 <0.88 <0.0044 <0.0044 <0.0044 <0.0088 -- <0.0044 -- <0.0044 <0.88 <0.0044 -- <0.0044 <0.088 --SB-5 20.5' 06/07/06 20.5 <0.94 <0.0047 <0.0047 <0.0047 <0.0094 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 --SB-5 30.0' 06/07/06 30.0 <0.98 <0.0049 <0.0049 <0.0049 <0.0098 -- <0.0049 -- <0.0049 <0.98 <0.0049 -- <0.0049 <0.098 -- SB-6
SB-6 5' 06/06/06 5.0 190 c <0.025 <0.025 0.11 0.051 -- <0.025 -- <0.025 <5.0 <0.025 -- <0.025 <0.50 -- SB-6 10' 06/07/06 10.0 290 c <0.50 <0.50 1.1 7.2 -- <0.50 -- <0.50 <100 <0.50 -- <0.50 <10 --SB-6 15' 06/07/06 15.0 8,800 <17 42 61 390 -- <17 -- <17 <3,000 <17 -- <17 <330 -- SB-6 20' 06/07/06 20.0 930 c <1.3 <1.3 5.7 18 -- <1.3 -- <1.3 <250 <1.3 -- <1.3 <25 -- SB-6 25.5' 06/07/06 25.5 <0.96 <0.0048 <0.0048 <0.0048 <0.0096 -- <0.0048 -- <0.0048 <0.96 <0.0048 -- <0.0048 <0.096 --SB-6 30.5' 06/07/06 30.5 <0.93 <0.0046 <0.0046 <0.0046 0.007 -- <0.0046 -- <0.0046 <0.93 <0.0046 -- <0.0046 <0.093 -- SB-7
SB-7 15' 06/07/06 15.0 <1.0 <0.0050 <0.0050 <0.0050 0.0069 -- <0.0050 -- <0.0050 <1.0 <0.0050 -- <0.0050 <0.10 -- SB-7 30.5' 06/07/06 30.5 <0.94 <0.0047 <0.0047 <0.0047 0.0065 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 -- V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 2 of 9 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Eth Toluene ylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 1 1,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
SB-8
SB-8 15.5' 06/07/06 15.5 <0.94 <0.0047 <0.0047 <0.0047 <0.0094 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 --SB-8 30.5' 06/07/06 30.5 <0.98 <0.0049 <0.0049 <0.0049 <0.0098 -- <0.0049 -- <0.0049 <0.98 <0.0049 -- <0.0049 <0.098 -- SB-9
SB-9 (2.5) 02/03/10 + 2.5 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00089 <0.001 <0.026 -- SB-9 (5.0) 02/03/10 + 5.0 <0.047 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 <0.0073 <0.001 <0.021 --SB-9 (7.5) 02/03/10 + 7.5 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.093 <0.001 <0.023 -- SB-9 (10.0) 02/09/10 + 10.0 0.060 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0037 <0.001 <0.024 -- SB-9 (12.5) 02/09/10 + 12.5 <0.057 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 <0.00086 <0.001 <0.026 --SB-9 (15.0) 02/09/10 + 15.0 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.010 <0.001 <0.023 --SB-9 (17.5) 02/09/10 + 17.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.0082 <0.001 <0.025 --SB-9 (20.0) 02/09/10 + 20.0 <0.059 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 0.002 <0.001 <0.027 --SB-9 (22.5) 02/09/10 + 22.5 <0.064 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.15 <0.0007 <0.00097 <0.001 <0.029 --SB-9 (25.0) 02/09/10 + 25.0 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 0.0047 <0.001 <0.026 --SB-9 (27.5) 02/09/10 + 27.5 <0.057 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 0.0014 <0.001 <0.026 --SB-9 (30.0) 02/09/10 + 30.0 <0.052 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00079 <0.001 <0.024 --SB-9 (32.5) 02/09/10 + 32.5 <0.053 0.0008 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00082 <0.001 <0.024 --SB-9 (35.0) 02/09/10 + 35.0 <0.051 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00079 <0.001 <0.023 --SB-9 (37.5) 02/09/10 + 37.5 0.056 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.00087 <0.001 <0.023 -- SB-9 (40.0) 02/09/10 + 40.0 0.12 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00080 <0.001 <0.025 -- SB-10
SB-10 (2.5) 02/04/10 + 2.5 <0.049 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.0030 <0.001 <0.022 --SB-10 (5.0) 02/04/10 + 5.0 <0.046 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 <0.00074 <0.001 <0.021 --SB-10 (7.5) 02/04/10 + 7.5 <0.048 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 <0.00075 <0.001 <0.022 -- SB-10 (10.0) 02/09/10 + 10.0 0.13 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.011 <0.001 <0.022 -- SB-10 (12.5) 02/09/10 + 12.5 0.086 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 0.0069 <0.001 <0.022 -- SB-10 (15.0) 02/09/10 + 15.0 2.7 0.001 <0.001 <0.001 0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.016 <0.001 <0.024 -- SB-10 (17.5) 02/09/10 + 17.5 0.093 <0.0006 <0.001 <0.001 0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00082 <0.001 <0.026 -- SB-10 (20.0) 02/09/10 + 20.0 1.2 <0.0006 <0.001 <0.001 0.016 -- <0.001 -- <0.001 <0.11 <0.0006 0.0033 <0.001 <0.023 --SB-10 (22.5) 02/09/10 + 22.5 <0.056 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00026 <0.001 <0.026 --SB-10 (25.0) 02/09/10 + 25.0 <0.056 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00081 <0.001 <0.026 --SB-10 (27.5) 02/09/10 + 27.5 <0.052 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00078 <0.001 <0.024 --SB-10 (30.0) 02/09/10 + 30.0 <0.057 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 <0.00082 <0.001 <0.026 --SB-10 (32.5) 02/09/10 + 32.5 0.16 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00081 <0.001 <0.023 -- SB-10 (35.0) 02/09/10 + 35.0 0.086 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 <0.00083 <0.001 <0.026 -- SB-10 (37.5) 02/09/10 + 37.5 0.073 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 <0.00077 <0.001 <0.022 -- SB-10 (40.0) 02/09/10 + 40.0 1.5 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00082 <0.001 <0.024 -- SB-11
SB-11 (2.5) 02/04/10 + 2.5 <0.051 0.0008 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.0007 <0.00079 <0.001 <0.023 -- SB-11 (5.0) 02/04/10 + 5.0 <0.051 0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.001 <0.0078 <0.001 <0.023 --SB-11 (7.5) 02/04/10 + 7.5 0.17 0.003 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.002 <0.0080 <0.001 <0.023 -- SB-11 (10.0) 02/10/10 + 10.0 0.9 0.003 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.003 0.0015 <0.001 <0.024 -- V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 3 of 9 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Eth Toluene ylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 1 1,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
SB-11 (12.5) 02/10/10 + 12.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 0.0008 0.0064 <0.001 <0.025 -- SB-11 (15.0) 02/10/10 + 15.0 <0.051 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.003 <0.00076 <0.001 <0.023 --SB-11 (17.5) 02/10/10 + 17.5 <0.054 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.002 <0.00079 <0.001 <0.024 --SB-11 (20.0) 02/10/10 + 20.0 <0.058 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 0.002 <0.00087 <0.001 <0.026 --SB-11 (22.5) 02/10/10 + 22.5 0.13 0.002 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.005 <0.00080 <0.001 0.035 -- SB-11 (25.0) 02/10/10 + 25.0 0.18 0.002 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 0.008 0.0031 <0.001 0.036 -- SB-11 (27.5) 02/10/10 + 27.5 0.41 0.004 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.003 0.0016 <0.001 <0.024 -- SB-11 (30.0) 02/10/10 + 30.0 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0012 <0.001 <0.024 -- SB-11 (32.5) 02/10/10 + 32.5 1.2 0.01 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 0.001 0.00083 <0.001 <0.026 -- SB-11 (35.0) 02/10/10 + 35.0 0.88 0.019 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 0.003 0.00088 <0.001 <0.027 -- SB-11 (37.5) 02/10/10 + 37.5 1.6 0.042 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.14 0.004 <0.00090 <0.001 <0.028 -- SB-11 (40.0) 02/10/10 + 40.0 1.6 0.053 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.007 <0.00083 <0.001 <0.025 -- SB-12
SB-12 (2.5) 02/04/10 + 2.5 <0.051 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00077 <0.001 <0.023 --SB-12 (5.0) 02/04/10 + 5.0 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 <0.00078 <0.001 <0.023 --SB-12 (7.5) 02/04/10 + 7.5 <0.055 0.002 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0021 <0.001 <0.025 -- SB-12 (10.0) 02/09/10 + 10.0 0.57 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.031 <0.001 <0.023 -- SB-12 (15.0) 02/09/10 + 15.0 0.13 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.031 <0.001 <0.022 -- SB-12 (20.0) 02/09/10 + 20.0 0.18 0.001 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 0.016 <0.001 <0.026 --SB-12 (22.5) 02/09/10 + 22.5 <0.059 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.14 <0.0007 <0.00088 <0.001 <0.027 --SB-12 (25.0) 02/09/10 + 25.0 <0.058 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 0.0022 <0.001 <0.026 -- SB-12 (27.5) 02/09/10 + 27.5 <0.052 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0022 <0.001 <0.024 -- SB-12 (30.0) 02/09/10 + 30.0 <0.058 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 <0.00084 <0.001 <0.026 --SB-12 (32.5) 02/09/10 + 32.5 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00081 <0.001 <0.026 --SB-12 (35.0) 02/09/10 + 35.0 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00081 <0.001 <0.024 --SB-12 (37.5) 02/09/10 + 37.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00078 <0.001 <0.025 --SB-12 (40.0) 02/09/10 + 40.0 0.13 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.0018 <0.001 <0.022 -- SB-13
SB-13 (2.5) 02/03/10 + 2.5 <0.048 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 0.0013 <0.001 <0.022 --SB-13 (5.0) 02/03/10 + 5.0 <0.054 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0040 <0.001 <0.024 --SB-13 (7.5) 02/03/10 + 7.5 <0.049 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.0015 <0.001 <0.022 -- SB-13 (10.0) 02/10/10 + 10.0 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 0.0023 <0.001 <0.026 -- SB-13 (12.5) 02/10/10 + 12.5 <0.051 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0014 <0.001 <0.023 -- SB-13 (15.0) 02/10/10 + 15.0 <0.056 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00083 <0.001 <0.025 -- SB-13 (17.5) 02/10/10 + 17.5 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00080 <0.001 <0.026 --SB-13 (20.0) 02/10/10 + 20.0 <0.060 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.14 <0.0007 0.0011 <0.001 <0.027 -- SB-13 (22.5) 02/10/10 + 22.5 <0.052 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00080 <0.001 <0.024 --SB-13 (25.0) 02/10/10 + 25.0 <0.052 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00080 <0.001 <0.024 --SB-13 (27.5) 02/10/10 + 27.5 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00080 <0.001 <0.024 --SB-13 (30.0) 02/10/10 + 30.0 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 <0.00084 <0.001 <0.023 --SB-13 (32.5) 02/10/10 + 32.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00083 <0.001 <0.025 --SB-13 (35.0) 02/10/10 + 35.0 <0.054 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00079 <0.001 <0.024 --SB-13 (37.5) 02/10/10 + 37.5 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00079 <0.001 <0.024 --SB-13 (40.0) 02/10/10 + 40.0 <0.051 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00083 <0.001 <0.023 -- V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 4 of 9 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Eth Toluene ylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 1 1,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
MW2 (25) 01/21/93 25.0 21 1.2 0.16 0.76 4.7 -- -- -- -- -- -- -- -- -- --MW2 (28) 01/21/93 28.0 11 0.87 0.10 0.29 1.5 -- -- -- -- -- -- -- -- -- --MW2 (30) 01/21/93 30.0 270 3.1 10 9.5 48 -- -- -- -- -- -- -- -- -- --MW2 (35) 01/21/93 35.0 110 2.3 4.3 3.0 17 -- -- -- -- -- -- -- -- -- --MW2 (40) 01/21/93 40.0 28 1.0 1.2 0.72 3.2 -- -- -- -- -- -- -- -- -- --MW2 (45) 01/21/93 45.0 7.5 1.1 0.25 0.18 0.60 -- -- -- -- -- -- -- -- -- -- MW2 (47.5) 01/21/93 47.5 2.8 0.32 0.14 0.080 0.35 -- -- -- -- -- -- -- -- -- -- MW2 (50) 01/21/93 50.0 <1.0 0.043 0.016 0.0087 0.040 -- -- -- -- -- -- -- -- -- -- MW2 (52.5) 01/21/93 52.5 2.4 0.30 0.14 0.083 0.39 -- -- -- -- -- -- -- -- -- -- MW2 (55) 01/21/93 55.0 1.0 0.081 0.090 0.035 0.16 -- -- -- -- -- -- -- -- -- -- MW2 (58) 01/21/93 58.0 <1.0 0.012 0.0083 <0.005 0.010 -- -- -- -- -- -- -- -- -- -- MW-3
MW3 (5) 01/22/93 5.0 3,500 14 18 45 220 -- -- -- -- -- -- -- -- -- -- MW3 (10) 01/22/93 10.0 1,500 6.2 13 19 120 -- -- -- -- -- -- -- -- -- --MW3 (13) 01/22/93 13.0 1.5 0.033 0.0066 0.027 0.088 -- -- -- -- -- -- -- -- -- -- MW3 (15) 01/22/93 15.0 9.6 0.093 0.020 0.11 0.34 -- -- -- -- -- -- -- -- -- -- MW3 (20) 01/22/93 20.0 120,000 480 1,000 1,300 8,800 -- -- -- -- -- -- -- -- -- --MW3 (25) 01/22/93 25.0 10 0.56 0.23 0.18 1.2 -- -- -- -- -- -- -- -- -- -- MW3 (27.5) 01/22/93 27.5 11 0.68 0.51 0.20 1.4 -- -- -- -- -- -- -- -- -- -- MW3 (30) 01/22/93 30.0 11 0.62 0.46 0.16 1.0 -- -- -- -- -- -- -- -- -- --MW3 (35) 01/22/93 35.0 2.3 0.13 0.090 0.036 0.24 -- -- -- -- -- -- -- -- -- -- MW3 (40) 01/22/93 40.0 1.5 0.20 0.067 0.014 0.072 -- -- -- -- -- -- -- -- -- -- MW3 (44.5) 01/22/93 44.5 <1.0 0.032 0.0056 <0.005 0.0096 -- -- -- -- -- -- -- -- -- -- MW3 (47.5) 01/22/93 47.5 <1.0 0.41 <0.005 <0.005 0.019 -- -- -- -- -- -- -- -- -- -- MW3 (50) 01/22/93 50.0 <1.0 0.34 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW-3R
MW-3R (2.5) 02/03/10 + 2.5 25 <0.031 <0.062 0.30 0.86 -- <0.062 -- <0.062 <6.2 <0.031 0.058 <0.062 <1.2 -- MW-3R (5.0) 02/03/10 + 5.0 14 <0.031 <0.063 0.17 0.56 -- <0.063 -- <0.063 <6.3 <0.031 0.12 <0.063 <1.3 --MW-3R (7.5) 02/03/10 + 7.5 19 <0.032 <0.063 <0.063 0.14 -- <0.063 -- <0.063 <6.3 <0.032 0.023 <0.063 <1.3 -- MW-3R (10.0) 02/08/10 + 10.0 72 <0.029 <0.059 0.15 0.50 -- <0.059 -- <0.059 <5.9 <0.029 0.060 <0.059 <1.2 -- MW-3R (12.5) 02/08/10 + 12.5 49 <0.030 <0.061 <0.061 <0.061 -- <0.061 -- <0.061 <6.1 <0.030 2.6 <0.061 <1.2 --MW-3R (15.0) 02/08/10 + 15.0 3.4 0.005 0.003 0.007 0.030 -- <0.001 -- <0.001 <0.11 0.001 0.23 <0.001 <0.021 --MW-3R (17.5) 02/08/10 + 17.5 5,100 <0.11 <0.22 17 81 -- <0.22 -- <0.22 <22 <0.11 0.56 <0.22 <4.3 --MW-3R (20.0) 02/08/10 + 20.0 7,300 0.81 <0.67 19 37 -- <0.67 -- <0.67 <67 <0.34 13 <0.67 <13 -- MW-3R (22.5) 02/08/10 + 22.5 61 <0.029 <0.057 0.11 0.33 -- <0.057 -- <0.057 <5.7 <0.029 0.27 <0.057 <1.1 --MW-3R (25.0) 02/08/10 + 25.0 11 0.005 0.001 0.008 0.054 -- <0.001 -- <0.001 <0.12 0.006 0.041 <0.001 <0.024 -- MW-3R (27.5) 02/08/10 + 27.5 19 0.14 0.006 0.052 0.26 -- <0.001 -- <0.001 <0.13 0.022 0.076 <0.001 <0.026 --MW-3R (30.0) 02/08/10 + 30.0 0.66 0.004 <0.001 0.002 0.004 -- <0.001 -- <0.001 <0.12 0.008 0.0066 <0.001 <0.024 --MW-3R (32.5) 02/08/10 + 32.5 0.074 0.003 <0.001 0.001 0.002 -- <0.001 -- <0.001 <0.13 0.013 0.003 <0.001 <0.026 --MW-3R (35.0) 02/08/10 + 35.0 0.074 0.002 <0.001 <0.001 0.001 -- <0.001 -- <0.001 <0.12 0.015 <0.00082 <0.001 <0.023 -- MW-3R (37.5) 02/08/10 + 37.5 2.3 0.008 <0.001 0.005 0.011 -- <0.001 -- <0.001 <0.13 0.018 0.041 <0.001 <0.025 --MW-3R (40.0) 02/08/10 + 40.0 14 0.011 0.002 0.037 0.18 -- <0.001 -- <0.001 <0.11 0.017 0.31 <0.001 <0.021 -- MW-5
MW5 (5) 05/10/94 5.0 1.3 0.021 0.0072 <0.005 0.012 -- -- -- -- -- -- -- -- -- -- MW5 (10) 05/10/94 10.0 5.3 0.15 0.0096 <0.005 0.014 -- -- -- -- -- -- -- -- -- -- V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 6 of 9 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Eth Toluene ylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 1 1,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
MW5 (15) 05/10/94 15.0 <1.0 0.013 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (19.5) 05/10/94 19.5 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (25) 05/10/94 25.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (29.5) 05/10/94 29.5 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (35) 05/11/94 35.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW5 (40) 05/11/94 40.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW5 (45) 05/11/94 45.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW5 (49) 05/11/94 49.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW-6
MW6 (7) 05/10/94 7.0 2.0 b <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW6 (10) 05/10/94 10.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW6 (15) 05/10/94 15.0 <1.0 0.014 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW6 (20) 05/10/94 20.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW6 (25) 05/10/94 25.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW6 (30) 05/10/94 30.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW6 (35) 05/10/94 35.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW6 (40) 05/10/94 40.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW6 (45) 05/10/94 45.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- --MW6 (49) 05/10/94 49.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW-7
MW-7 15.5' 06/06/06 15.5 <0.93 <0.0046 <0.0046 <0.0046 <0.0093 -- <0.0046 -- <0.0046 <0.93 <0.0046 -- <0.0046 <0.093 --MW-7 25.5' 06/06/06 25.5 <0.98 <0.0049 <0.0049 <0.0049 <0.0098 -- <0.0049 -- <0.0049 <0.98 <0.0049 -- <0.0049 <0.098 -- MW-7 35' 06/06/06 35.0 <0.96 <0.0048 <0.0048 <0.0048 <0.0096 -- <0.0048 -- <0.0048 <0.96 <0.0048 -- <0.0048 <0.096 -- MW-8
MW-8-S-N-3 10/06/11 g 3.0 <0.046 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 <0.001 <0.001 <0.021 --MW-8-S-N-6 10/06/11 g 6.0 <0.043 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.098 <0.0005 <0.001 <0.001 <0.020 -- MW-8-S-N-10 10/06/11 g 10.0 1.6 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 0.003 <0.001 <0.021 -- MW-8-S-N-13 10/06/11 e 13.0 0.24 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 <0.001 <0.001 <0.020 -- MW-8-S-N-15 10/06/11 15.0 0.086 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 <0.001 <0.001 <0.021 -- MW-8-S-N-18 10/06/11 f 18.0 0.70 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.098 <0.0005 <0.001 <0.001 <0.020 -- MW-8-S-N-20 10/06/11 20.0 0.34 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.098 <0.0005 <0.001 <0.001 <0.020 -- MW-8-S-N-22 10/06/11 22.0 <0.044 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 <0.001 <0.001 <0.020 --MW-8-S-N-25 10/06/11 25.0 <0.043 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.099 <0.0005 <0.001 <0.001 <0.020 -- MW-10
MW-10-S-2.5 10/15/12 2.5 <0.042 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.095 <0.005 <0.001 <0.001 <0.019 -- MW-10-S-5 10/15/12 5.0 <0.046 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- MW-10-S-7.5 10/15/12 7.5 <0.046 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- MW-10-S-12.5 10/25/12 12.5 <0.044 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.099 <0.005 <0.001 <0.001 <0.020 -- MW-10-S-15 10/25/12 15.0 0.10 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.11 <0.005 <0.001 <0.001 <0.022 -- MW-10-S-17.5 10/25/12 17.5 0.21 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- MW-10-S-20 10/25/12 20.0 0.11 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.096 <0.005 <0.001 <0.001 <0.019 -- MW-10-S-22.5 10/25/12 22.5 <0.043 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.099 <0.005 <0.001 <0.001 <0.020 -- MW-10-S-25 10/25/12 25.0 <0.045 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 7 of 9 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Eth Toluene ylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 1 1,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
MW-10-S-27.5 10/25/12 27.5 <0.042 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.097 <0.005 <0.001 <0.001 <0.019 -- MW-10-S-30 10/25/12 30.0 0.76 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.11 <0.005 <0.001 <0.001 <0.021 -- MW-10-S-32.5 10/25/12 32.5 0.40 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.097 <0.005 <0.001 <0.001 <0.019 -- MW-10-S-35 10/25/12 35.0 0.88 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.11 <0.005 <0.001 <0.001 <0.022 -- MW-10-S-37.5 10/25/12 37.5 0.18 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- MW-10-S-40 10/25/12 40.0 <0.046 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- Soil Vapor WellsSV-2
SV-2 (2.5) 02/02/10 + 2.5 1.0 0.0009 <0.001 0.023 0.012 -- <0.001 -- <0.001 <0.12 <0.0006 0.069 <0.001 <0.024 -- SV-2 (5.0) 02/02/10 + 5.0 2.0 0.001 <0.001 0.053 0.007 -- <0.001 -- <0.001 <0.11 <0.0005 0.074 <0.001 <0.021 --SV-2 (7.5) 02/02/10 + 7.5 37 0.058 <0.057 0.79 0.13 -- <0.057 -- <0.057 <5.7 <0.029 0.11 <0.057 <1.1 -- SV-2 (10.0) 02/02/10 + 10.0 4,200 2.6 <0.58 65 28 -- <0.058 -- <0.58 <58 <0.29 2.5 <0.58 <1.2 -- SV-3
SV-3 (2.5) 02/02/10 + 2.5 1,700 <0.030 <0.060 6.0 41 -- <0.060 -- <0.060 <6.0 <0.030 1.6 <0.061 <1.2 -- SV-3 (5.0) 02/02/10 + 5.0 <0.046 <0.005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 0.003 <0.001 <0.021 --SV-3 (7.5) 02/02/10 + 7.5 50 <0.027 <0.054 0.15 0.90 -- <0.054 -- <0.054 <5.4 <0.027 0.20 <0.054 <1.1 -- SV-4
SV-4 (2.5) 02/02/10 + 2.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00078 <0.001 <0.025 -- SV-4 (5.0) 02/02/10 + 5.0 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 0.00091 <0.001 <0.025 -- SV-4 (7.5) 02/02/10 + 7.5 34 <0.029 <0.058 <0.058 0.081 -- <0.058 -- <0.058 <5.8 <0.029 0.0076 <0.058 <1.2 -- SV-5
SV-5 (2.5) 02/01/10 + 2.5 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.0079 <0.001 <0.024 -- SV-5 (5.0) 02/01/10 + 5.0 <0.052 0.002 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.011 <0.001 <0.023 -- SV-5 (7.5) 02/01/10 + 7.5 0.11 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 0.048 <0.001 <0.025 -- SV-5 (10.0) 02/01/10 + 10.0 0.44 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 <0.0078 <0.001 <0.023 -- SV-6
SV-6 (2.5) 02/01/10 + 2.5 <0.060 0.0020 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.14 <0.0007 <0.00090 <0.001 <0.027 -- SV-6 (5.0) 02/01/10 + 5.0 <0.058 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 <0.00087 <0.001 <0.026 -- SV-6 (7.5) 02/01/10 + 7.5 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.0013 <0.001 <0.023 -- SV-6 (10.0) 02/01/10 + 10.0 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00083 <0.001 <0.024 -- SV-7
SV-7 (2.5) 02/01/10 + 2.5 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.0011 <0.001 <0.023 -- SV-7 (5.0) 02/01/10 + 5.0 <0.048 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 <0.0080 <0.001 <0.022 -- SV-7 (7.5) 02/01/10 + 7.5 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00080 <0.001 <0.026 -- SV-7 (10.0) 02/01/10 + 10.0 <0.048 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 <0.0080 <0.001 <0.022 -- SV-8
SV-8 (2.5) 02/01/10 + 2.5 0.45 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 0.0076 <0.001 <0.022 -- SV-8 (5.0) 02/01/10 + 5.0 0.051 0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0088 <0.001 <0.023 --SV-8 (7.5) 02/01/10 + 7.5 <0.056 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.0079 <0.001 <0.026 -- SV-8 (10.0) 02/01/10 + 10.0 300 0.045 <0.001 0.13 0.12 -- <0.051 -- <0.051 <5.1 <0.026 0.15 <0.051 <1.0 -- SV-9
SV-9-S-N-3 10/05/11 3.0 6.5 <0.023 <0.046 <0.046 <0.046 -- <0.046 -- <0.046 <4.6 <0.023 0.065 <0.046 <0.91 -- SV-9-S-N-5 10/05/11 5.0 1.9 0.0006 <0.001 0.003 0.005 -- <0.001 -- <0.001 <0.10 <0.0005 0.007 <0.001 <0.021 -- V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 8 of 9 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Eth Toluene ylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 1 1,2-DCA 2
(mg/kg)
TABLE 1

V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 9 of 9 As-Built NAPL GWE
Sample ID Screen Interval Thickness Sheen Change
(feet, bTOC) (feet) (feet)
Soil Borings
SB-3 -- -- 06/06/06 44 -- -- -- -- 900 59 1.8 16 25 1.8 <1.0 <2,000 150 <1.0 64 -- SB-4 -- -- 06/07/06 30 -- -- -- -- 1,200 1.9 6.2 23 140 <0.50 <0.50 <1,000 <0.50 <0.50 <10 -- SB-5 -- -- 06/07/06 30 -- -- -- -- <50 <0.50 <0.50 <0.50 <1.0 <0.50 <0.50 <1,000 <0.50 <0.50 <10 -- SB-6 -- -- 06/07/06 30 -- -- -- -- 12,000 36 250 270 1,600 <5.0 <5.0 <10,000 <5.0 <5.0 <100 -- SB-7 -- -- 06/08/06 37.5 -- -- -- -- 110 k 46 <0.71 <0.71 <1.0 <0.71 <0.71 <1,400 73 <0.71 330 -- SB-8 -- -- 06/08/06 39 -- -- -- -- <50 14 <0.50 <0.50 <1.0 <0.50 <0.50 <1,000 0.82 <0.50 <10 -- SB-9 -- -- 02/09/10 36 -- -- -- -- <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 0.14 SB-10 -- -- 02/09/10 35 -- -- -- -- 150 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 0.14 SB-11 -- -- 02/10/10 35 -- -- -- -- 510 160 <0.50 <0.50 <0.50 <0.50 <0.50 <50 32 <0.50 41 0.11 SB-12 -- -- 02/09/10 37.5 -- -- -- -- <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 0.15 SB-13 -- -- 02/10/10 37.5 -- -- -- -- <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 <0.10 Groundwater Monitoring Wells
MW-1 40 - 60 39.67 † 01/27/93 45.89 0.00 No -6.22 a -- 55,000 7,300 9,300 2,100 12,000 -- -- -- -- -- -- -- 03/23/93 47.54 0.00 -- -7.87 a -1.65 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 04/12/93 47.55 0.00 -- -7.88 a -0.01 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 05/13/93 47.83 0.00 No -8.16 a -0.28 28,000 13,000 1,100 550 2,800 -- -- -- -- -- -- -- 06/15/93 48.02 0.00 -- -8.35 a -0.19 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 07/14/93 48.13 0.00 -- -8.46 a -0.11 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 08/17/93 48.25 0.00 No -8.58 a -0.12 12,000 3,900 1,400 100 1,100 -- -- -- -- -- -- --

39.36 ‡ 09/15/93 48.02 0.00 -- -8.66 -- MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 10/05/93 48.03 0.00 -- -8.67 -0.01 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 11/16/93 48.03 0.00 No -8.67 0.00 12,000 4,100 630 110 800 -- -- -- -- -- -- -- 02/24/94 47.94 0.00 No -8.58 0.09 5,300 1,200 520 37 370 -- -- -- -- -- -- --

39.37 § 05/27/94 48.22 0.00 No -8.85 -- 3,200 740 390 48 250 -- -- -- -- -- -- -- 08/31/94 48.56 0.00 No -9.19 -0.34 1,500 79 9.1 <5.0 25 -- -- -- -- -- -- -- 11/29/94 48.99 0.00 No -9.62 -0.43 2,900 570 120 48 130 -- -- -- -- -- -- -- 02/23/95 48.90 0.00 No -9.53 0.09 1,500 150 14 12 57 -- -- -- -- -- -- -- 05/31/95 48.03 0.00 No -8.66 0.87 8,300 1,700 360 120 800 -- -- -- -- -- -- -- 08/21/95 48.07 0.00 No -8.70 -0.04 2,300 550 75 35 130 -- -- -- -- -- -- -- 11/20/95 48.25 0.00 No -8.88 -0.18 3,800 730 170 50 270 -- -- -- 1,200 -- -- -- 02/19/96 48.32 0.00 No -8.95 -0.07 3,000 400 55 37 180 -- -- -- 1,700 -- -- -- 05/16/96 48.12 0.00 No -8.75 0.20 2,100 340 20 62 210 -- -- -- 1,100 -- -- -- 08/22/96 47.71 0.00 No -8.34 0.41 13,000 940 180 73 320 -- -- -- 920 -- -- -- 11/14/96 48.00 0.00 No -8.63 -0.29 3,400 850 <20 44 20 -- -- -- 150 -- -- -- 02/13/97 c 47.61 0.00 -- -8.24 0.39 2,200 210 42 32 120 -- -- -- 800 -- -- -- 05/14/97 c 47.07 0.00 No -7.70 0.54 1,100 130 8.8 25 50 -- -- -- 790 -- -- -- 08/12/97 c 47.86 0.00 No -8.49 -0.79 2,400 380 100 68 190 -- -- -- 1,100 -- -- -- 11/11/97 c 47.25 0.00 No -7.88 0.61 2,500 400 37 38 71 -- -- -- 380 -- -- -- 02/11/98 c 46.57 0.00 -- -7.20 0.68 2,200 370 62 39 110 -- -- -- 750 -- -- -- 05/05/98 c 46.19 0.00 -- -6.82 0.38 3,100 190 10 59 88 -- -- -- 810 -- -- -- 07/31/98 c 47.31 0.00 -- -7.94 -1.12 2,800 e 640 56 140 300 -- -- -- 1,300 -- -- -- 11/11/98 c 46.41 0.00 -- -7.04 0.90 2,000 320 60 60 130 -- -- -- 920 -- -- -- 02/26/99 c 45.37 0.00 -- -6.00 1.04 2,000 340 52 62 130 -- -- -- 710 -- -- -- 05/28/99 c 46.69 0.00 -- -7.32 -1.32 1,800 410 24 61 110 -- -- -- 780 -- -- -- 08/24/99 c 46.73 0.00 -- -7.36 -0.04 2,800 390 <20 68 88 -- -- -- 640 -- -- -- 11/05/99 c 46.80 0.00 -- -7.43 -0.07 2,900 650 55 110 170 -- -- -- 580 -- -- -- 02/03/00 c 46.04 0.00 -- -6.67 0.76 1,920 412 20.0 71.8 77.6 <10 <10 <5,000 620 (805) h <10 <1,000 -- 05/02/00 c 46.59 0.00 -- -7.22 -0.55 3,150 646 31.1 138 222 <10 <10 <5,000 477 (745) h <10 903 -- 10/13/03 41.50 -- -- -2.13 -- 1,400 170 25 43 137 2.0 <0.50 <1,000 200 <0.50 68 -- 03/11/04 40.56 -- -1.19 0.94 1,200 65 5.4 7.1 33 1.6 <0.50 <50 98 <0.50 110 -- Naphthalene 5to GW 1TBA 4
(µg/L) (µg/L)
MTBE 3
(µg/L)
Ethanol 4
(feet)
Xylenes DIPE 4
ETBE 4TAME 4
(µg/L)
TABLE 2

38.61 ‡‡ 07/25/06 35.96 -- -- 2.65 -- 2,200 720 150 66 230 <6.3 <6.3 <13,000 250 <6.3 <130 -- 02/15/07 36.19 -- -- 2.42 -0.23 4,900 1,400 14 150 440 -- -- -- 430 -- -- -- 07/20/07 m 35.70 -- -- 2.91 0.49 4,100 1,400 11 81 140 6.0 <0.50 <50 540 <0.50 200 -- 01/15/08 35.71 -- -- 2.90 -0.01 6,700 1,800 13 170 320 5.0 <4.0 <1,000 420 <4.0 170 -- 01/09/09 m 35.36 -- -- 3.25 0.35 2,400 570 4.0 35 43 3.0 <1.0 <100 220 <1.0 90 --

41.25 §§ 03/03/10 33.65 -- -- 7.60 -- 1,400 320 4.0 18 8.0 1.0 <0.50 <50 120 <0.50 31 -- 10/15/10 33.45 -- -- 7.80 0.20 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 01/14/11 32.86 -- -- 8.39 0.59 21,000 9,700 51 54 78 6.0 <5.0 <500 770 <5.0 230 -- GROUNDWATER MONITORING WELL DESTROYED OCTOBER 17, 2011
MW-1R 30 - 40 41.07 §§ 03/03/10 33.51 -- -- 7.56 -- 39,000 6,100 760 670 3,500 5.0 <3.0 <250 490 <3.0 160 -- 04/05/10 33.10 -- -- 7.97 0.41 46,000 7,500 990 960 3,600 6.0 <3.0 <250 620 <3.0 250 -- 10/15/10 33.30 -- -- 7.77 -0.20 81,000 8,600 2,800 1,700 9,200 8.0 <5.0 <500 1,300 <5.0 730 -- 01/14/11 32.71 -- -- 8.36 0.59 61,000 8,200 2,200 1,800 8,100 8.0 <3.0 <250 1,100 <3.0 520 -- 09/20/11 31.86 -- -- 9.21 0.85 62,000 7,400 630 1,500 9,500 9.0 <5.0 <500 1,200 <5.0 760 -- 01/06/12 32.05 -- -- 9.02 -0.19 57,000 8,700 360 2,100 8,200 11 <10 <1,000 1,500 <10 820 -- 01/27/12 32.08 -- -- 8.99 -0.03 MONITORING WELL GAUGED ONLY; SPECIAL SAMPLING EVENT FOR WELLS MW-8 AND MW-9 07/02/12 31.45 -- -- 9.62 0.63 58,000 8,700 300 1,800 7,900 10 <0.5 <50 920 <0.5 680 -- 11/02/12 32.15 -- -- 8.92 -0.70 GAUGED ONLY; INITIAL SAMPLING EVENT FOR MW-10 01/04/13 31.51 -- -- 9.56 0.64 49,000 8,400 250 2,300 5,400 10 <5 <500 1,200 <5 650 -- GROUNDWATER MONITORING WELL DESTROYED JANUARY 30, 2013
MW-1RA 20 - 40 41.45 §§§ 07/23/13 32.73 -- -- 8.72 -- 32,000 7,700 54 1,100 160 9 <5 <500 1,400 <5 1,000 -- MW-2 40 - 60 39.67 † 01/27/93 48.37 0.00 No -8.70 a -- 2,300 540 26 <0.50 56 -- -- -- -- -- -- -- 03/23/93 48.47 0.00 -- -8.80 a -0.10 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 04/12/93 48.45 0.00 -- -8.78 a 0.02 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 05/13/93 48.57 0.00 No -8.90 a -0.12 2,200 1,100 63 36 100 -- -- -- -- -- -- -- 06/15/93 48.68 0.00 -- -9.01 a -0.11 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 07/14/93 48.71 0.00 -- -9.04 a -0.03 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 08/17/93 48.85 0.00 No -9.18 a -0.14 2,000 690 18 21 24 -- -- -- -- -- -- --

39.30 ‡ 09/15/93 48.71 0.00 -- -9.41 -- MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 10/05/93 48.72 0.00 -- -9.42 -0.01 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 11/16/93 48.86 0.00 No -9.56 -0.14 710 420 8.4 13 18 -- -- -- -- -- -- -- 02/24/94 48.96 0.00 No -9.66 -0.10 1,400 550 11 17 27 -- -- -- -- -- -- --

39.32 § 05/27/94 49.21 0.00 No -9.89 -- 550 350 4.0 12 14 -- -- -- -- -- -- -- 08/31/94 49.80 0.00 No -10.48 -0.59 2,200 590 <10 23 18 -- -- -- -- -- -- -- 11/29/94 49.81 0.00 No -10.49 -0.01 2,900 890 <20 46 37 -- -- -- -- -- -- -- 02/23/95 49.76 0.00 No -10.44 0.05 1,000 400 4.7 20 11 -- -- -- -- -- -- -- 05/31/95 48.17 0.00 No -8.85 1.59 3,700 1,300 15 62 53 -- -- -- -- -- -- -- 08/21/95 48.25 0.00 No -8.93 -0.08 1,600 720 <12.5 29 20 -- -- -- -- -- -- -- 11/20/95 48.65 0.00 No -9.33 -0.40 1,800 640 <10 16 10 -- -- -- 270 -- -- -- 02/19/96 48.78 0.00 No -9.46 -0.13 3,500 950 <10 71 27 -- -- -- 580 -- -- -- 05/16/96 48.95 0.00 No -9.63 -0.17 2,200 1,200 22 95 77 -- -- -- 540 -- -- -- 08/22/96 47.57 0.00 No -8.25 1.38 9,000 600 11 19 22 -- -- -- 180 -- -- -- 11/14/96 48.57 0.00 No -9.25 -1.00 2,200 660 <20 34 <20 -- -- -- 140 -- -- -- 02/13/97 c 47.57 0.00 -- -8.25 1.00 2,900 590 <20 53 55 -- -- -- 500 -- -- -- 05/14/97 c 47.46 0.00 No -8.14 0.11 1,800 350 <10 41 16 -- -- -- 500 -- -- -- 08/12/97 c 48.24 0.00 No -8.92 -0.78 1,500 120 <10 31 16 -- -- -- 490 -- -- -- 11/11/97 c 47.68 0.00 No -8.36 0.56 1,700 210 <10 28 22 -- -- -- 440 -- -- -- 02/11/98 c 46.41 0.00 -- -7.09 1.27 4,100 2,100 36 110 180 -- -- -- 820 -- -- -- 05/05/98 c 46.52 0.00 -- -7.20 -0.11 2,200 d 540 17 64 39 -- -- -- 440 -- -- -- 07/31/98 c 47.80 0.00 -- -8.48 -1.28 1,700 f 260 <0.50 40 35 -- -- -- 290 -- -- -- 11/11/98 c 46.91 0.00 -- -7.59 0.89 1,400 230 13 26 51 -- -- -- 470 -- -- -- V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 2 of 7 As-Built NAPL GWE
Sample ID Screen Interval Thickness Sheen Change
(feet, bTOC) (feet) (feet)
Naphthalene 5to GW 1TBA 4
(µg/L) (µg/L)
MTBE 3
(µg/L)
Ethanol 4
(feet)
Xylenes DIPE 4
ETBE 4TAME 4
(µg/L)
TABLE 2

38.58 †† 09/22/04 39.60 -- -- -1.02 -- 260 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 7.0 <0.50 <5.0 -- 09/26/05 38.16 -- -- 0.42 1.44 280 k <0.50 <0.50 <0.50 <1.0 <0.50 <0.50 <1,000 10 <0.50 <10 -- 02/03/06 34.48 -- -- 4.10 3.68 820 43 1.6 1.1 2.1 <0.50 <0.50 <1,000 41 <0.50 <10 --

38.58 ‡‡ 07/25/06 33.06 -- -- 5.52 -- 940 150 2.2 3.9 2.6 <1.3 <1.3 <2,500 45 <1.3 <25 -- 02/15/07 33.70 -- -- 4.88 -0.64 390 1.0 <1.0 <1.0 <1.0 -- -- -- 21 -- -- -- 07/20/07 m 33.84 -- -- 4.74 -0.14 330 0.70 n <0.50 <0.50 <0.50 <0.50 <0.50 <50 27 <0.50 3.0 n -- 01/15/08 32.65 -- -- 5.93 1.19 280 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <250 8.0 <1.0 <5.0 -- 01/09/09 m 33.22 -- -- 5.36 -0.57 <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 --

41.15 §§ 03/03/10 30.32 -- -- 10.83 -- 150 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 2.0 <0.50 <2.0 -- 10/15/10 31.30 -- -- 9.85 -0.98 200 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 4.0 <0.50 <2.0 -- 01/14/11 30.00 -- -- 11.15 1.30 56 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 0.6 <0.50 <2.0 -- GROUNDWATER MONITORING WELL DESTROYED OCTOBER 17, 2011
MW-3 39.5 - 59.5 39.86 † 01/27/93 46.78 0.00 No -6.92 a -- 1,100 450 19 5.7 35 -- -- -- -- -- -- -- 03/23/93 47.25 0.00 -- -7.39 a -0.47 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 04/12/93 47.28 0.00 -- -7.42 a -0.03 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 05/13/93 47.45 0.00 No -7.59 a -0.17 5,700 3,400 43 73 44 -- -- -- -- -- -- -- 06/15/93 47.64 0.00 -- -7.78 a -0.19 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 07/14/93 47.72 0.00 -- -7.86 a -0.08 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 08/17/93 47.87 0.00 No -8.01 a -0.15 3,600 1,800 72 24 65 -- -- -- -- -- -- --

39.57 ‡ 09/15/93 47.71 0.00 -- -8.14 -- MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 10/05/93 47.73 0.00 -- -8.16 -0.02 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 11/16/93 47.75 0.00 No -8.18 -0.02 1,700 1,600 14 16 19 -- -- -- -- -- -- -- 02/24/94 47.82 0.00 No -8.25 -0.07 3,700 900 21 21 54 -- -- -- -- -- -- --

39.59 § 05/27/94 48.04 0.00 No -8.45 -- 850 180 3.3 4.7 35 -- -- -- -- -- -- -- 08/31/94 48.38 0.00 No -8.79 -0.34 2,300 170 3.1 6.7 47 -- -- -- -- -- -- -- 11/29/94 48.73 0.00 No -9.14 -0.35 1,700 210 15 10 54 -- -- -- -- -- -- -- 02/23/95 48.66 0.00 No -9.07 0.07 1,300 100 2.9 4.1 11 -- -- -- -- -- -- -- 05/31/95 47.66 0.00 No -8.07 1.00 1,400 190 5.6 8.8 21 -- -- -- -- -- -- -- 08/21/95 47.75 0.00 No -8.16 -0.09 660 130 3.5 8.1 9.3 -- -- -- -- -- -- -- 11/20/95 48.07 0.00 No -8.48 -0.32 660 63 <2.5 3.8 4.2 -- -- -- 200 -- -- -- 02/19/96 48.22 0.00 No -8.63 -0.15 950 b 170 <5.0 <5.0 <5.0 -- -- -- 240 -- -- -- 05/16/96 47.68 0.00 No -8.09 0.54 1,300 630 <5.0 32 8.1 -- -- -- 98 -- -- -- 08/22/96 47.51 0.00 No -7.92 0.17 2,800 560 19 20 43 -- -- -- 230 -- -- -- 11/14/96 47.49 0.00 No -7.90 0.02 2,000 790 7.9 43 16 -- -- -- 130 -- -- -- 02/13/97 c 47.46 0.00 -- -7.87 0.03 1,800 360 6.7 20 13 -- -- -- 130 -- -- -- 05/14/97 c 46.81 0.00 No -7.22 0.65 1,400 210 <5.0 6.2 8.7 -- -- -- 85 -- -- -- 08/12/97 c 47.37 0.00 No -7.78 -0.56 1,400 320 <5.0 16 7.3 -- -- -- 150 -- -- -- 11/11/97 c 47.12 0.00 No -7.53 0.25 1,900 370 <10 29 31 -- -- -- 130 -- -- -- 02/11/98 c 46.48 0.00 -- -6.89 0.64 1,700 390 <10 17 12 -- -- -- 150 -- -- -- 05/05/98 c 46.33 0.00 -- -6.74 0.15 3,100 d 480 6.6 17 37 -- -- -- 240 -- -- -- 07/31/98 c 47.22 0.00 -- -7.63 -0.89 2,400 1,500 26 29 97 -- -- -- 350 -- -- -- 11/11/98 c 46.46 0.00 -- -6.87 0.76 2,100 910 <10 19 26 -- -- -- 270 -- -- -- 02/26/99 c 45.41 0.00 -- -5.82 1.05 1,600 570 <5.0 10 14 -- -- -- 330 -- -- -- 05/28/99 c 46.78 0.00 -- -7.19 -1.37 970 320 <5.0 7.2 15 -- -- -- 230 -- -- -- 08/24/99 c 46.83 0.00 -- -7.24 -0.05 1,800 g 270 3.8 8.5 8.6 -- -- -- 360 -- -- -- 11/05/99 c 47.11 0.00 -- -7.52 -0.28 1,600 400 23 72 83 -- -- -- 490 -- -- -- V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 3 of 7 As-Built NAPL GWE
Sample ID Screen Interval Thickness Sheen Change
(feet, bTOC) (feet) (feet)
Naphthalene 5to GW 1TBA 4
(µg/L) (µg/L)
MTBE 3
(µg/L)
Ethanol 4
(feet)
Xylenes DIPE 4
ETBE 4TAME 4
(µg/L)
TABLE 2

38.85 †† 09/22/04 40.75 -- -- -1.90 -- 850 7.1 0.70 2.9 2.9 1.1 <0.50 <50 110 <0.50 8.0 -- 09/26/05 38.93 -- -- -0.08 1.82 1,600 200 4.7 19 20.1 1.9 <1.7 <3,300 200 <1.7 43 -- 02/03/06 37.00 -- -- 1.85 1.93 1,400 190 2.6 12 8.6 1.8 <1.7 <3,300 240 <1.7 74 --

38.83 ‡‡ 07/25/06 35.37 -- -- 3.46 -- 3,100 53 110 110 490 <1.3 <1.3 <2,500 <1.3 <1.3 <25 -- 02/15/07 35.85 -- -- 2.98 -0.48 1,100 21 <1.0 (0.80) l <1.0 <1.0 -- -- -- 170 -- -- -- 07/20/07 m 35.43 -- -- 3.40 0.42 1,100 7.0 0.60 n 0.50 n <0.50 1.0 <0.50 <50 150 <0.50 30 -- 01/15/08 35.15 -- -- 3.68 0.28 990 14 <1.0 <1.0 <1.0 1.0 <1.0 <250 130 <1.0 23 -- 01/09/09 m 34.90 -- -- 3.93 0.25 1,100 14 <0.50 <0.50 <0.50 1.0 <0.50 <50 98 <0.50 18 --

41.40 §§ 03/03/10 32.71 -- -- 8.69 -- 1,100 2.0 <0.50 <0.50 <0.50 <0.5 <0.50 <50 29 <0.50 5.0 -- 10/15/10 32.93 -- -- 8.47 -0.22 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 01/14/11 32.00 -- -- 9.40 0.93 940 2.0 <0.50 <0.50 <0.50 <0.50 <0.50 <50 16 <0.50 5.0 -- GROUNDWATER MONITORING WELL DESTROYED OCTOBER 17, 2011
MW-3R 30 - 40 41.23 §§ 03/03/10 30.75 -- -- 10.48 -- 3,300 1,000 5.0 27 13 <1.0 <1.0 <100 180 <1.0 57 -- 04/05/10 30.40 -- -- 10.83 0.35 1,800 2,000 8.0 86 21 <3.0 <3.0 <250 180 <3.0 62 -- 10/15/10 31.51 -- -- 9.72 -1.11 4,600 1,100 8.0 34 17 <1.0 <1.0 100 140 <1.0 46 -- 01/14/11 30.52 -- -- 10.71 0.99 6,300 1,800 11 56 30 0.90 <0.50 <50 180 <0.50 47 -- 09/20/11 30.21 -- -- 11.02 0.31 6,100 1,300 11 43 28 1.0 <0.50 <50 170 <0.50 50 -- 01/06/12 30.43 -- -- 10.80 -0.22 6,100 1,400 10 45 28 <5.0 <5.0 <500 200 <5.0 38 -- 01/27/12 30.36 -- -- 10.87 0.07 MONITORING WELL GAUGED ONLY; SPECIAL SAMPLING EVENT FOR WELLS MW-8 AND MW-9 07/02/12 30.22 -- -- 11.01 0.14 5,500 1,300 12 34 27 0.9 <0.5 <50 200 <0.5 53 -- 11/02/12 30.42 -- -- 10.81 -0.20 GAUGED ONLY; INITIAL SAMPLING EVENT FOR MW-10 01/04/13 29.81 -- -- 11.42 0.61 5,100 1,200 9 22 14 <5 <5 <500 170 <5 40 -- GROUNDWATER MONITORING WELL DESTROYED JANUARY 30, 2013
MW-3RA 20 - 40 41.54 §§§ 07/23/13 32.33 -- -- 9.21 -- 4,800 970 9 32 18 0.8 <0.5 <50 120 <0.5 43 -- MW-5 40 - 60 39.60 § 05/27/94 50.15 0.00 No -10.55 -- <50 <0.50 <0.50 <0.50 <0.50 -- -- -- -- -- -- -- 08/31/94 50.36 0.00 No -10.76 -0.21 150 b 3.2 2.7 <0.50 <0.50 -- -- -- -- -- -- -- 11/29/94 50.72 0.00 No -11.12 -0.36 120 b 1.2 <0.50 <0.50 <0.50 -- -- -- -- -- -- -- 02/23/95 50.78 0.00 No -11.18 -0.06 110 b 2.5 <0.50 <0.50 <0.50 -- -- -- -- -- -- -- 05/31/95 50.42 0.00 No -10.82 0.36 93 1.4 1.3 <0.50 2.1 -- -- -- -- -- -- -- 08/21/95 50.50 0.00 No -10.90 -0.08 <50 0.72 <0.50 <0.50 <0.50 -- -- -- -- -- -- -- 11/20/95 50.55 0.00 No -10.95 -0.05 <50 1.9 0.72 <0.50 1.4 -- -- -- 8.9 -- -- -- 02/19/96 50.50 0.00 No -10.90 0.05 <50 1.4 <0.50 <0.50 <0.50 -- -- -- <40 -- -- -- 05/16/96 50.18 0.00 No -10.58 0.32 <50 1.4 <0.50 <0.50 <0.50 -- -- -- <40 -- -- -- 08/22/96 50.03 0.00 No -10.43 0.15 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <40 -- -- -- 11/14/96 49.68 0.00 No -10.08 0.35 <50 1.8 <0.50 <0.50 <0.50 -- -- -- 17 -- -- -- 02/13/97 c 49.90 0.00 -- -10.30 -0.22 <50 2.2 <0.50 <0.50 <0.50 -- -- -- 24 -- -- -- 05/14/97 c 48.98 0.00 No -9.38 0.92 <50 3.3 <0.50 <0.50 <0.50 -- -- -- 23 -- -- -- 08/12/97 c 49.45 0.00 No -9.85 -0.47 <50 4.7 <0.50 <0.50 <0.50 -- -- -- 22 -- -- -- 11/11/97 c 48.69 0.00 No -9.09 0.76 <50 4.8 <0.50 <0.50 <0.50 -- -- -- 28 -- -- -- 02/11/98 c 48.87 0.00 -- -9.27 -0.18 <50 4.1 <0.50 <0.50 <0.50 -- -- -- 19 -- -- -- 05/05/98 c 48.68 0.00 -- -9.08 0.19 <50 4.1 <0.50 <0.50 <0.50 -- -- -- 32 -- -- -- 07/31/98 c 48.90 0.00 -- -9.30 -0.22 <50 3.0 <0.50 <0.50 <0.50 -- -- -- 44 -- -- -- 11/11/98 c 48.07 0.00 -- -8.47 0.83 <50 0.97 <0.50 <0.50 <0.50 -- -- -- 37 -- -- -- 02/26/99 c 47.95 0.00 -- -8.35 0.12 <50 0.99 <0.50 <0.50 <0.50 -- -- -- 52 -- -- -- 05/28/99 c 48.33 0.00 -- -8.73 -0.38 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- 37 -- -- -- 08/24/99 c 48.25 0.00 -- -8.65 0.08 <50 1.1 <0.50 <0.50 <0.50 -- -- -- 73 -- -- -- 11/05/99 c 48.33 0.00 -- -8.73 -0.08 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- 38 -- -- -- 02/03/00 c 47.61 0.00 -- -8.01 0.72 <50 0.789 <0.50 <0.50 <0.50 <2.0 <2.0 <1,000 58.4 (80.8) h <2.0 <200 -- 05/02/00 c 47.87 0.00 -- -8.27 -0.26 <50 <0.50 <0.50 <0.50 <0.50 <2.0 <2.0 <1,000 36.1 (55.9) h <2.0 <100 -- 10/13/03 40.20 j -- -- -0.60 -- <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1,000 2.3 <0.50 <10 -- V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 4 of 7 As-Built NAPL GWE
Sample ID Screen Interval Thickness Sheen Change
(feet, bTOC) (feet) (feet)
Naphthalene 5to GW 1TBA 4
(µg/L) (µg/L)
MTBE 3
(µg/L)
Ethanol 4
(feet)
Xylenes DIPE 4
ETBE 4TAME 4
(µg/L)
TABLE 2

38.86 ‡‡ 07/25/06 40.21 -- -- -1.35 -- <50 <0.50 <0.50 <0.50 <1.0 <0.50 <0.50 <1,000 8.6 <0.50 <10 -- 02/15/07 39.20 -- -- -0.34 1.01 <50 <1.0 <1.0 <1.0 <1.0 -- -- -- 10 -- -- -- 07/20/07 m 38.17 -- -- 0.69 1.03 <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 15 <0.50 <2.0 -- 01/15/08 37.82 -- -- 1.04 0.35 <100 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <250 17 <1.0 <5.0 -- 01/09/09 m 37.66 -- -- 1.20 0.16 43 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 20 <0.50 <2.0 --

41.49 §§ 03/03/10 35.89 -- -- 5.60 -- <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 16 <0.50 <2.0 -- 10/15/10 35.51 -- -- 5.98 0.38 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 01/14/11 35.19 -- -- 6.30 0.32 <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 13 <0.50 3.0 -- GROUNDWATER MONITORING WELL DESTROYED OCTOBER 17, 2011
MW-6 40 - 60 39.77 § 05/27/94 49.19 0.00 No -9.42 -- <50 <0.50 <0.50 <0.50 <0.50 -- -- -- -- -- -- -- 08/31/94 49.43 0.00 No -9.66 -0.24 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- -- -- -- -- 11/29/94 49.79 0.00 No -10.02 -0.36 <50 1.2 <0.50 <0.50 <0.50 -- -- -- -- -- -- -- 02/23/95 49.78 0.00 No -10.01 0.01 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- -- -- -- -- 05/31/95 49.25 0.00 No -9.48 0.53 92 2.4 1.0 <0.50 1.8 -- -- -- -- -- -- -- 08/21/95 49.40 0.00 No -9.63 -0.15 <50 1.0 <0.50 <0.50 <0.50 -- -- -- -- -- -- -- 11/20/95 49.50 0.00 No -9.73 -0.10 <50 2.7 0.66 <0.50 1.5 -- -- -- 0.60 -- -- -- 02/19/96 49.47 0.00 No -9.70 0.03 <50 2.7 <0.50 <0.50 <0.50 -- -- -- <40 -- -- -- 05/16/96 49.15 0.00 No -9.38 0.32 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <40 -- -- -- 08/22/96 48.99 0.00 No -9.22 0.16 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <40 -- -- -- 11/14/96 48.87 0.00 No -9.10 0.12 <50 2.5 <0.50 <0.50 <0.50 -- -- -- 23 -- -- -- 02/13/97 c 48.88 0.00 -- -9.11 -0.01 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <5.0 -- -- -- 05/14/97 c 48.53 0.00 No -8.76 0.35 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <5.0 -- -- -- 08/12/97 c 48.57 0.00 No -8.80 -0.04 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <5.0 -- -- -- 11/11/97 c 48.04 0.00 No -8.27 0.53 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <5.0 -- -- -- 02/11/98 c 47.93 0.00 -- -8.16 0.11 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <2.5 -- -- -- 05/05/98 c 47.81 0.00 -- -8.04 0.12 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <2.5 -- -- -- 07/31/98 c 48.09 0.00 -- -8.32 -0.28 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <2.5 -- -- -- 11/11/98 c 47.34 0.00 -- -7.57 0.75 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <2.5 -- -- -- 02/26/99 c 46.77 0.00 -- -7.00 0.57 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <2.5 -- -- -- 05/28/99 c 48.41 0.00 -- -8.64 -1.64 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <2.5 -- -- -- 08/24/99 c 48.75 0.00 -- -8.98 -0.34 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <2.5 -- -- -- 11/05/99 c 48.85 0.00 -- -9.08 -0.10 <50 <0.50 <0.50 <0.50 <0.50 -- -- -- <2.5 -- -- -- 02/03/00 c 47.95 0.00 -- -8.18 0.90 <50 <0.50 <0.50 <0.50 <0.50 <2.0 <2.0 <1,000 <5.0 (<2.0) h <2.0 <200 -- 05/02/00 c 48.21 0.00 -- -8.44 -0.26 <50 <0.50 <0.50 <0.50 <0.50 <2.0 <2.0 <1,000 <5.0 (<2.0) h <2.0 <100 -- 10/13/03 42.50 j -- -- -2.73 -- <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <1,000 22 <0.50 10 -- 03/11/04 42.05 -- -- -2.28 0.45 210 <0.50 7.1 4.7 39 <0.50 <0.50 <50 6.0 <0.50 12 --

38.75 †† 09/22/04 42.20 -- -- -3.45 -- <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 2.9 <0.50 <5.0 -- 09/26/05 40.31 -- -- -1.56 1.89 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <0.50 <1,000 <0.50 <0.50 <10 -- 02/03/06 40.76 j -- -- -2.01 -0.45 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <0.50 <1,000 0.69 <0.50 <10 --

39.03 ‡‡ 07/25/06 37.71 -- -- 1.32 -- <50 <0.50 <0.50 <0.50 <1.0 <0.50 <0.50 <1,000 <0.50 <0.50 <10 -- 02/15/07 37.45 -- -- 1.58 0.26 <50 <1.0 <1.0 <1.0 <1.0 -- -- -- <1.0 -- -- -- 07/20/07 m 36.81 -- -- 2.22 0.64 <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 -- 01/15/08 36.70 -- -- 2.33 0.11 <100 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <250 <1.0 <1.0 <5.0 -- 01/09/09 m 36.48 -- -- 2.55 0.22 <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 --

41.60 §§ 03/03/10 MONITORING WELL WAS INACCESSIBLE
10/15/10 36.57 -- -- -36.57 -- MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 01/14/11 34.20 -- -- -34.20 2.37 <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 3.0 -- GROUNDWATER MONITORING WELL DESTROYED OCTOBER 17, 2011
MW-7 31 - 46 38.67 ‡‡ 07/25/06 35.83 -- -- 2.84 -- <50 <0.50 <0.50 <0.50 <1.0 <0.50 <0.50 <1,000 <0.50 <0.50 <10 -- 02/15/07 35.25 -- -- 3.42 0.58 <50 <1.0 <1.0 <1.0 <1.0 -- -- -- <1.0 -- -- -- V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 5 of 7 As-Built NAPL GWE
Sample ID Screen Interval Thickness Sheen Change
(feet, bTOC) (feet) (feet)
Naphthalene 5to GW 1TBA 4
(µg/L) (µg/L)
MTBE 3
(µg/L)
Ethanol 4
(feet)
Xylenes DIPE 4
ETBE 4TAME 4
(µg/L)
TABLE 2

41.24 §§ 03/03/10 33.03 -- -- 8.21 -- 65 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 -- 10/15/10 33.21 -- -- 8.03 -0.18 MONITORING WELL NOT SAMPLED; GROUNDWATER GAUGING EVENT 01/14/11 32.75 -- -- 8.49 0.46 <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 --

41.23 ††† 09/20/11 31.63 -- -- 9.60 -- <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 -- 01/06/12 31.90 -- -- 9.33 -0.27 <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 -- 01/27/12 32.20 -- -- 9.03 -0.30 MONITORING WELL GAUGED ONLY; SPECIAL SAMPLING EVENT FOR WELLS MW-8 AND MW-9 07/02/12 31.42 -- -- 9.81 0.78 MONITORING WELL GAUGED ONLY; SAMPLED ANNUALLY DURING FIRST QUARTER 11/02/12 32.04 -- -- 9.19 -0.62 GAUGED ONLY; INITIAL SAMPLING EVENT FOR MW-10 01/04/13 31.65 -- -- 9.58 0.39 34 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <0.50 <0.5 <2 -- 07/23/13 32.36 -- -- 8.87 -0.71 <22 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <0.5 <0.5 <2 -- MW-8 25 - 40 41.04 ††† 01/27/12 31.72 -- -- 9.32 -- 27 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 -- 07/02/12 31.16 -- -- 9.88 0.56 26 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <0.5 <0.5 <2 -- 11/02/12 31.69 -- -- 9.35 -0.53 GAUGED ONLY; INITIAL SAMPLING EVENT FOR MW-10 01/04/13 29.85 -- -- 11.19 1.84 25 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <0.5 <0.5 <2 -- 07/23/13 31.96 -- -- 9.08 -2.11 40 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <0.5 <0.5 <2 -- MW-9 27.5 - 40 41.09 ††† 01/27/12 32.15 -- -- 8.94 -- 120 2.0 <0.50 <0.50 <0.50 <0.50 <0.50 <50 21 <0.50 41 -- 07/02/12 31.60 -- -- 9.49 0.55 180 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <50 34 <0.5 43 -- 11/02/12 32.28 -- -- 8.81 -0.68 GAUGED ONLY; INITIAL SAMPLING EVENT FOR MW-10 01/04/13 31.82 -- -- 9.27 0.46 200 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <50 32 <0.5 42 -- 07/23/13 32.75 -- -- 8.34 -0.93 180 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <50 30 <0.5 40 -- MW-10 25 - 40 40.34 ‡‡‡ 11/02/12 22.62 -- -- 17.72 -- <22 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <2.0 -- 01/04/13 21.47 -- -- 18.87 1.15 <22 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <0.5 <0.5 <2 -- 07/23/13 27.90 -- -- 12.44 -6.43 <22 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <50 <0.5 <0.5 <2 -- CRWQCB Residential ESLs (Potential Drinking Water Resource) 100 1.0 40 30 20 -- -- -- 5.0 -- 12 17 Notes:
-- Not analyzed/applicable/measured EPA U.S. Environmental Protection Agency GW Groundwater TAME Tertiary amyl methyl ether < Indicates less than stated laboratory reporting limit ETBE Ethyl tertiary butyl ether GWE Groundwater elevation TBA Tertiary butyl alcohol µg/L Micrograms per liter ESL Environmental screening level MTBE Methyl tertiary butyl ether TOC Top of casing CRWQCB California Regional Water Quality Control Board DIPE Di-isopropyl ether NAPL Non-aqueous phase liquid TPH-GRO Total petroleum hydrocarbons - gasoline range organics †
‡
§
††
‡‡
§§
†††
‡‡‡
§§§
1 For Soil Borings, depth to GW was measured from below the ground surface. For Groundwater Monitoring Wells, depth to groundwater was measured from the top of the well box (prior to 09/15/93) or TOC. 2 Analyzed by EPA Method 8015 for samples collected between 01/27/93 and 10/13/03; by EPA Method 8260 for samples collected between 03/11/04 and 01/04/13. 3 Analyzed by EPA Method 8020 for samples collected between 01/27/93 and 05/02/00; by EPA Method 8260 for samples collected between 10/13/00 and 01/04/13. 4 Analyzed by EPA Method 8260.

TOC elevation was surveyed by Kier & Wright of Pleasanton, California. The survey was performed to a vertical accuracy of 0.01 feet and relative to MSL, per Benchmark U813 (N.G.S. bronze disk at Spruce Avenue and railroad tracks (elevation =

21.62 feet MSL).

Elevation was surveyed by Kier & Wright of Pleasanton, California. The survey was performed to a vertical accuracy of 0.01 feet and relative to mean sea level (MSL), per Benchmark U813 (N.G.S. bronze disk at Spruce Avenue and railroad tracks (elevation = 21.62 feet MSL). Surveyed elevation represented the well cover.

TOC elevation was re-surveyed on September 5, 2004. The consultant at the time (ENSR) did not provide details regarding the datum used.

21.62 feet MSL).

TOC elevation was surveyed by Stantec Consulting Services Inc. on March 11, 2013. The survey was performed relative to the NAVD 88 datum.

TOC elevation was surveyed by Mid Coast Engineers of Watsonville, California on Ocotber 30, 2012. The survey was perfromed relative to the NAVD 88 datum.

TOC elevation was surveyed by Mid Coast Engineers of Watsonville, California on November 8, 2011. The survey was perfromed relative to the NAVD 88 datum.

TOC elevation was surveyed by Muir Consulting, Inc. of Oakdale, California on March 1, 2010. The survey was performed relative to the NAVD 88 datum. The surveyed elevations of wells MW-1 through MW-3, MW-5 through MW-7, HA-1, and HA-2 were adjusted with a correction factor to match the survey performed by Muir Consulting, Inc.

TOC elevation was surveyed by Morrow Surveying of Rancho Cordova, California on June 26, 2006. The survey was performed relative to the NAVD 29 datum, and was tied into the surveyed elevations of wells located at San Mateo County site #550037, located across the street at 209 El Camino Real.

V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 6 of 7 As-Built NAPL GWE
Sample ID Screen Interval Thickness Sheen Change
(feet, bTOC) (feet) (feet)
Naphthalene 5to GW 1TBA 4
(µg/L) (µg/L)
MTBE 3
(µg/L)
Ethanol 4
(feet)
Xylenes DIPE 4
ETBE 4TAME 4
(µg/L)
TABLE 2

HISTORICAL GROUNDWATER MONITORING AND ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
BTEX 3 Date
South San Francisco, California
TOC Depth
Elevation Sampled GWE TPH-GRO Toluene Ethylbenzene 2 Benzene (feet) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) Notes (Continued):
5 Analyzed by EPA Method 8270.
a The groundwater elevation reported by KEI was based on measurements taken from the top of the well box. b The laboratory reported that the chromatogram pattern was atypical of gasoline. The chromatogram indicated the presence of unidentified hydrocarbons <C7. c The monitoring wells were not purged prior to sampling. d The chromatogram indicated the presence of gasoline and unidentified hydrocarbons <C6-C8. e The chromatogram indicated the presence of gasoline and unidentified hydrocarbons <C6-C12. f The laboratory reported that the chromatogram pattern was atypical of gasoline. The chromatogram indicated the presence of unidentified hydrocarbons <C6-C12. g The laboratory reported that the chromatogram pattern was atypical of gasoline. The chromatogram indicated the presence of unidentified hydrocarbons <C6. h The sample was additionally analyzed for MTBE by EPA Method 8260; the results of the analysis are presented in parentheses. i The chromatogram indicated the presence of weathered gasoline. j The depth to groundwater was measured after other site monitoring wells were purged and sampled. k The laboratory reported that the chromatogram pattern was atypical of gasoline. l Estimated value in parentheses.
m The analytical reporting limits presented by the laboratory are method detection limits. The quantitation limits were not provided in the analytical report. n Estimated value.

V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 7 of 7 Sample Isopropyl Carbon
Sample ID Depth Initial Final 1,2-DCA 2
1,3-DCB 21,4-DCB 2EDB 2ETBE 2Ethanol 22-Propanol Ether 2 MTBE 2 Naphthalene 2TAME 2TBA 2 Oxygen 4 Dioxide4 Methane4 Helium4
(feet, bgs) (inHg) (inHg) (µg/m3
) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (%) (%) (%) (%) Soil Vapor Wells
SV-2
SV-2 5.0 5 02/18/10 i -29.5 -5.0 32,000,000 b 43,000 b <2,200 84,000 b 7,400 b <2,500 -- -- -- -- -- -- -- -- <2,100 <12,000 <31 -- -- 300,000 b 1.1 12 1.8 <0.12 5 07/13/10 i -30.0 -5.0 49,000,000 62,000 <4,300 170,000 12,000 <5,000 -- -- -- -- -- -- -- -- <4,100 <24,000 <31 -- -- 290,000 1.2 16 1.5 <0.12 SV-2 10.0 10 02/18/10 i -30.0 -4.0 56,000,000 b 83,000 b <4,100 130,000 b 38,000 b <4,800 <4,000 <23,000 <31 -- -- 490,000 b 1.1 12 2.2 <0.11 07/13/10 i -28.0 -5.0 53,000,000 86,000 <4,600 160,000 47,000 <5,200 -- -- -- -- -- -- -- -- <4,400 <25,000 <31 -- -- 410,000 1.2 15 2.2 <0.12 SV-2 10.0 Dup 10 02/18/10 i -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 36 -- -- -- -- -- -- -- 07/13/10 i -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 8.1 -- -- -- -- -- -- -- SV-3
SV-3 4.0 4 02/17/10 i -28.5 -5.0 76,000,000 b 32,000 b 23,000 b 240,000 b 810,000 b 290,000 b -- -- -- -- -- -- -- -- <4,400 <26,000 <31 -- -- 1,500,000 b 1.4 5.6 0.60 <0.12 4 07/14/10 i -30.0 -5.0 150,000,000 b 47,000 b 29,000 b 460,000 b 1,300,000 b 490,000 b -- -- -- -- -- -- -- -- <6,800 <40,000 <31 -- -- 3,300,000 b 1.5 10 0.79 <0.19 SV-3 7.5 7.5 02/17/10 i -29.0 -5.0 16,000,000 b 3,600 b <2,200 3,000 b 8,900 b 3,200 b -- -- -- -- -- -- -- -- <2,100 <12,000 <31 -- -- 240,000 b 1.2 11 0.48 <0.12

7.5 07/14/10 i -30.0 -5.0 13,000,000 <3,800 <4,500 <5,200 <5,200 <5,200 -- -- -- -- -- -- -- -- <4,300 <25,000 <31 -- -- 90,000 1.6 16 1.1 <0.12 SV-3 7.5 Dup 7.5 02/17/10 i -- -- 16,000,000 b 3,600 b <2,300 <2,600 7,200 b <2,600 -- -- -- -- -- -- -- -- <2,200 <13,000 <31 -- -- 240,000 b 1.2 12 0.49 <0.12

7.5 07/14/10 i -30.0 -5.0 12,000,000 b 2,600 b <900 <1,000 1,500 b <1,000 -- -- -- -- -- -- -- -- <860 <5,000 <31 -- -- 88,000 b 6.4 15 0.91 <0.16 SV-4
SV-4 4.0 4 02/17/10 i -30.0 -5.0 32,000,000 b 11,000 b <4,300 <5,000 <5,000 <5,000 -- -- -- -- -- -- -- -- <4,100 <24,000 <31 -- -- 280,000 b 1.2 14 2.4 <0.11 4 07/14/10 i -29.5 -5.0 40,000,000 5,300 <4,400 <5,100 <5,100 <5,100 -- -- -- -- -- -- -- -- <4,200 <25,000 <31 -- -- 240,000 1.2 17 2.7 <0.12 SV-4 8.0 8 02/17/10 i -29.0 -4.0 36,000,000 b 14,000 b <4,100 <4,800 <4,800 <4,800 -- -- -- -- -- -- -- -- <4,000 <23,000 <31 -- -- 320,000 b 1.1 15 2.7 <0.11 8 07/14/10 i -30.0 -5.0 41,000,000 14,000 <4,200 <4,900 <4,900 <4,900 -- -- -- -- -- -- -- -- <4,100 <24,000 <31 -- -- 250,000 1.2 17 2.8 <0.11 SV-4 8.0 Dup 8 02/17/10 i -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- <7.8 -- -- -- -- -- -- -- SV-4 8.0 Dup 8 07/14/10 i -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- <7.8 -- -- -- -- -- -- -- SV-5
SV-5 10.0 10 02/16/10 i -30.0 -5.0 3,900,000 b 800 b 270 b <240 <240 <240 -- -- -- -- -- -- -- -- <200 <1,200 <31 -- -- 11,000 b 1.4 13 3.0 <0.11 10 07/13/10 i -30.0 -5.0 4,900,000 b <1,900 <2,200 <2,600 <2,600 <2,600 -- -- -- -- -- -- -- -- <2,100 <12,000 <31 -- -- 15,000 b 1.2 15 2.8 <0.12 SV-5 10.0 Dup 10 02/16/10 i -30.0 -5.0 3,700,000 b 590 b <530 <610 <610 <610 -- -- -- -- -- -- -- -- <500 <2,900 <31 -- -- 9,400 b 1.5 13 2.9 <0.11 SV-6
SV-6 5.0 5 02/16/10 i -30.0 -5.0 780,000 b 84 b 68 b 76 b 140 b 84 b -- -- -- -- -- -- -- -- <43 <250 <31 -- -- 580 b 1.2 12 0.35 <0.12 5 07/15/10 i -29.0 -5.0 1,200,000 <540 <640 <740 <740 <740 -- -- -- -- -- -- -- -- <610 <3,600 <31 -- -- 1,200 1.2 18 0.36 <0.12 SV-6 10.0 10 02/16/10 i -30.0 -5.0 1,100,000 b 94 b 66 b 320 b 230 b 190 b -- -- -- -- -- -- -- -- <43 <250 <31 -- -- 1,100 b 1.2 12 0.50 <0.12 10 07/15/10 i -30.0 -5.0 1,400,000 <730 <870 <1,000 <1,000 <1,000 -- -- -- -- -- -- -- -- <830 <4,800 <31 c -- -- 1,600 1.2 17 0.41 <0.12 SV-6 10.0 Dup 10 07/15/10 i -30.0 -5.0 1,200,000 <610 <720 <820 <820 <820 -- -- -- -- -- -- -- -- <680 <4,000 <31 -- -- 1,500 1.2 17 0.040 <0.12 SV-7
SV-7 5.0 5 02/17/10 i -30.0 -5.0 <95 <3.7 <4.4 <5.0 <5.0 <5.0 -- -- -- -- -- -- -- -- <4.2 <24 <31 -- -- <4.1 11 8.0 <0.00023 <0.12 5 07/14/10 i -29.0 -5.0 570 <3.6 <4.2 <4.9 <4.9 <4.9 -- -- -- -- -- -- -- -- <4.1 <24 <31 -- -- <4.0 11 7.9 <0.00023 <0.11 SV-7 10.0 10 02/17/10 i -30.0 -5.0 <97 <3.8 <4.5 <5.2 <5.2 <5.2 -- -- -- -- -- -- -- -- <4.3 <25 <31 -- -- <4.2 11 8.4 <0.00024 <0.12 10 07/14/10 i -28.0 -5.0 270 <3.6 4.9 <4.9 <5.0 <5.0 -- -- -- -- -- -- -- -- <4.1 <24 <31 -- -- <4.0 12 8.3 <0.00031 <0.15 SV-8
SV-8 5.0 5 02/18/10 i -29.0 -5.0 <95 <3.7 <4.4 <5.0 <5.0 <5.0 -- -- -- -- -- -- -- -- <4.2 <24 <31 -- -- <4.1 5.9 10 <0.00023 <0.12 5 07/13/10 i -29.0 -5.0 <240 <3.8 <4.4 <5.1 <5.1 <5.1 -- -- -- -- -- -- -- -- <4.2 <25 <31 -- -- <4.1 7.3 14 <0.00024 <0.12 SV-8 10.0 10 02/18/10 i -30.0 -5.0 19,000,000 b 7,800 b <1,400 <1,600 2,600 b <1,600 -- -- -- -- -- -- -- -- <1,400 <8,000 <62 -- -- 350,000 b 1.1 15 3.1 <0.11 10 07/13/10 i -29.0 -5.0 16,000,000 b 10,000 b <4,400 <5,100 <5,100 <5,100 -- -- -- -- -- -- -- -- <4,200 <25,000 <31 -- -- 380,000 b 2.9 16 2.7 <0.12 SV-8 10.0 Dup 10 02/18/10 i -30.0 -5.0 20,000,000 b 8,000 b 840 b <830 3,000 b <830 -- -- -- -- -- -- -- -- <690 <4,000 <62 -- -- 350,000 b 1.1 15 3.2 <0.11 SV-8 5.0 Dup 10 07/13/10 i -29.0 -5.0 <240 <3.7 <4.4 <5.0 <5.0 <5.0 -- -- -- -- -- -- -- -- <4.2 <24 <31 -- -- <4.1 7.2 14 <0.00024 <0.12 SV-9
SV-9 5 5 10/12/11 d,g,h,i -30.0 -7.5 15,000,000 2,300 <150 1,100 1,500 270 <160 <240 <240 <310 <670 <300 <400 <670 <140 <840 <840 <670 <490 <490 9.7 2.2 0.47 <0.080 SV-9 5 5 02/06/12 d,i -30.0 -5.0 19,000,000 980 240 230 <220 <220 <200 <300 <300 <390 <840 <380 <500 <840 <180 <1,000 -- <840 <610 -- 1.3 8.7 0.44 <0.076 Hexane
2 (µg/m
3 (µg/m )
3 ) (µg/m3) (µg/m3) (µg/m3) (µg/m3)
Naphthalene 3
(µg/m3)
O-Xylenes
Date Vacuum BTEX 2
Sampled TPH-GRO 1 Benzene Toluene Ethylbenzene M-&P-Xylenes TABLE 3

HISTORICAL SOIL VAPOR ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
(µg/m3)
V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 1 of 3 Sample Isopropyl Carbon
Sample ID Depth Initial Final 1,2-DCA 2
1,3-DCB 21,4-DCB 2EDB 2ETBE 2Ethanol 22-Propanol Ether 2 MTBE 2 Naphthalene 2TAME 2TBA 2 Oxygen 4 Dioxide4 Methane4 Helium4
(feet, bgs) (inHg) (inHg) (µg/m3
) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (%) (%) (%) (%) Hexane
2 (µg/m
3 (µg/m )
3 ) (µg/m3) (µg/m3) (µg/m3) (µg/m3)
Naphthalene 3
(µg/m3)
O-Xylenes
Date Vacuum BTEX 2
Sampled TPH-GRO 1 Benzene Toluene Ethylbenzene M-&P-Xylenes TABLE 3

HISTORICAL SOIL VAPOR ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
(µg/m3)
SV-9 10 10 10/12/11 d,g,h,i -29.5 -4.0 140,000,000 86,000 15,000 340,000 1,100,000 43,000 <1,500 <2,300 <2,300 <2,900 <6,400 <2,900 <3,700 <6,400 <1,400 <8,000 <8,000 <6,400 <4,600 <4,600 1.5 12 3.0 <0.076 SV-9 10 10 02/06/12 d,i -26.0 -4.0 97,000,000 71,000 16,000 260,000 860,000 43,000 <1,900 <2,900 <2,900 <3,700 <8,000 <3,600 <4,700 <8,000 <1,700 <10,000 -- <8,000 <5,800 -- 2.8 9.9 2.2 <0.072 SV-9 10 Dup 10 10/12/11 d,g,h,i -- -- 150,000,000 85,000 13,000 290,000 960,000 36,000 <3,200 <4,800 <4,800 <6,200 <13,000 <6,100 <7,900 <13,000 <2,900 <17,000 <17,000 <13,000 <9,800 <9,800 1.4 12 3.1 <0.080 SV-9 (Shroud, 5') -- 10/12/11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 5.9 SV-9 (Shroud, 10') -- 10/12/11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 4.6 SV-9 (Shroud) -- 02/09/12 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 31 Sub-Slab Probes
SSV-1
SSV-1 -- 02/17/10 -27.5 -5.0 510 <3.9 <8.8 a <5.2 6.1 <5.2 -- -- -- -- -- -- -- -- <4.4 <25 32 -- -- 4.7 2.1 <0.024 <0.00024 1.4 -- 07/14/10 -29.5 -5.0 <240 <3.8 6.5 <5.1 <5.1 <5.1 -- -- -- -- -- -- -- -- <4.2 <25 <31 -- -- <14 21 0.040 <0.00024 0.87 SSV-2
SSV-2 -- 10/12/11 -30.0 -4.0 930 <23 <27 <31 <31 <31 <29 <43 <43 <55 <120 <54 <71 <120 <26 <150 -- <120 <87 <87 21 0.39 <0.00014 0.40 SSV-2 -- 02/09/12 -28.0 -5.0 1,200 <7.1 <8.4 12 49 <9.7 <9.0 <13 <13 <17 <37 <17 <22 <37 <8.0 <47 -- <37 <27 -- 20 0.43 <0.00022 0.50 SSV-2 (Shroud) -- 10/12/11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 9.2 SSV-2 (Shroud) -- 02/09/12 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30 SSV-3
SSV-3 -- 09/30/11 -29.5 -4.0 2,900 <3.6 4.8 <4.9 <4.9 <4.9 <4.5 <6.7 <6.7 <8.6 <19 92 <11 <19 <4.0 <23 <23 <19 <14 <14 16 4.4 <0.00022 <0.11 SSV-3 -- 02/09/12 -29.0 -4.0 960 <3.2 <3.8 <4.3 <4.3 <4.3 <4.0 <6..0 <6.0 <7.7 <17 <7.5 <9.8 <17 <3.6 <21 -- <17 <12 -- 19 1.8 <0.00020 <0.10 SSV-3 Duplicate -- 09/30/11 -- -- 2,600 <3.6 5.2 <4.9 <4.9 <4.9 <4.5 <6.7 <6.7 <8.6 <19 71 <11 <19 <4.0 <23 <23 <19 <14 <14 16 4.4 <0.00022 <0.11 SSV-3 (Shroud) -- 09/30/11 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 7.1 SSV-3 (Shroud) -- 02/09/12 f -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- <0.050 f Ambient Air
Outdoor
-- 02/17/10 -30.0 -8.0 <67 <2.6 <4.2 e <3.6 <3.6 <3.6 -- -- -- -- -- -- -- -- <3.0 <17 -- -- -- <2.9 22 0.043 0.00022 <0.082 -- 07/14/10 -30.0 -8.0 <170 <2.7 <3.2 <3.7 <3.7 <3.7 -- -- -- -- -- -- -- -- <3.1 <18 -- -- -- <3.0 22 0.041 0.00020 <0.085 Indoor
-- 02/17/10 -30.0 -6.0 580 4.9 30 5.4 60 6.9 -- -- -- -- -- -- -- -- <2.7 <16 -- -- -- 9.0 22 0.047 0.00022 <0.074 -- 07/14/10 -30.0 -7.0 2,000 6.0 180 8.2 86 b 12 -- -- -- -- -- -- -- -- <2.7 <16 -- -- -- 8.9 21 0.046 0.00019 <0.075

SHROUD-HE
-- 02/18/10 -- -- <95 <3.7 <4.4 <5.0 <5.0 <5.0 -- -- -- -- -- -- -- -- <4.2 <24 -- -- -- <4.1 -- -- -- 5.9 -- 07/15/10 -- -- <250 <4.0 <4.7 <5.4 <5.4 <5.4 -- -- -- -- -- -- -- -- <4.5 <26 -- -- -- <4.4 20 0.041 <0.00025 5.1 Lab Blank
-- 09/30/11 -- -- <100 <1.6 <1.9 <2.2 <2.2 <2.2 <2.0 <3.0 <3.0 <3.8 <8.4 <3.8 <4.9 <8.4 <1.8 -- -- <8.4 <6.1 -- <0.10 <0.010 <0.00010 <0.05 -- 10/12/11 -- -- <100 <16 <19 <22 <22 <22 <20 <30 <30 <38 <84 <38 <49 <84 <18 -- -- <84 <61 -- <0.10 <0.010 <0.00010 <0.05 300,000 42 160,000 490 58 -- 110 17 -- -- -- -- 4,700 -- -- -- -- -- -- -- 2,500,000 420 1,300,000 4,900 580 -- 1,100 170 -- -- -- -- 47,000 -- -- -- -- -- -- -- -- 85 -- 1,100 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 280 -- 3,600 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 85,000 -- 1,100,000 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 280,000 -- 3,600,000 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Notes:
-- Not analyzed/applicable/measured 1,2-DCA 1,2-Dichloroethane ETBE Ethyl tertiary butyl ether % Percent 1,3-DCB 1,3-Dichlorobenzene ESL Environmental screening level < Indicates less than laboratory reporting limit 1,4-DCB 1,4-Dichlorobenzene MTBE Methyl tertiary butyl ether bgs Below ground surface CRWQCB California Regional Water Quality Control Board TAME Tertiary amyl methyl ether inHg Inches in mercury EDB Ethylene dibromide TBA Tertiary butyl alcohol µg/m3 Micrograms per cubic meter EPA Environmental Protection Agency TPH-GRO Total petroleum hydrocarbons - gasoline range organics 1 Analyzed by EPA Method TO-15 for samples collected through 7/14/2010. Analyzed by EPA Method EPA Method TO-3 for samples collected after 7/14/2010 to the present. 2 Analyzed using EPA Method TO-15 for samples collected through 7/14/2010. Analyzed by EPA Method TO-14A for samples collected after 7/14/2010 to the present.

Commercial
Residential
CRWQCB Shallow Soil Gas ESLs ◊
440,000
52,000
360
36 With Bioattenuation - Commercial
With Bioattenuation - Residential
Without Bioattenuation - Commercial
Without Bioattenuation - Residential
SWRCB LTCP Screening Criteria ♦
310,000
93,000
310
93 V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 2 of 3 Sample Isopropyl Carbon
Sample ID Depth Initial Final 1,2-DCA 2
1,3-DCB 21,4-DCB 2EDB 2ETBE 2Ethanol 22-Propanol Ether 2 MTBE 2 Naphthalene 2TAME 2TBA 2 Oxygen 4 Dioxide4 Methane4 Helium4
(feet, bgs) (inHg) (inHg) (µg/m3
) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (µg/m3) (%) (%) (%) (%) Hexane
2 (µg/m
3 (µg/m )
3 ) (µg/m3) (µg/m3) (µg/m3) (µg/m3)
Naphthalene 3
(µg/m3)
O-Xylenes
Date Vacuum BTEX 2
Sampled TPH-GRO 1 Benzene Toluene Ethylbenzene M-&P-Xylenes TABLE 3

HISTORICAL SOIL VAPOR ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
(µg/m3)
Notes (Continued):
3 Analyzed by EPA Method TO-17 for samples collected on or before 7/14/2010. 4 Analyzed using ASTM D1946.
a Compound considered non-detect at the listed value due to associated blank contamination. b Compound was positively identified; however, the associated numerical value is an estimated concentration only. c The sample results are rejected as unusable. The analyte may or may not be present in sample. d Dilution was performed due to the presence of high level non-target species. e The recovery of surrogate fluorobenzene was otuside control limits due to high level hydrocarbon matrix interference, and was confirmed by re-analysis. Data is reported as qualified. f The tedlar bag sample for SSV-3 SHROUD was received with insufficient volume to perform the ASTM D1946 analysis. The remaining sample was located using a syringe rather than using a direct sample loop introduction technique. The data reported is an estimated value. g During analysis by EPA Method TO-14/15A, the recovery of surrogate 1,2-dichloroethane-d4 was outside control limits due to high level hydrocarbon matrix interference. Data is reported as qualified. h During analysis by EPA Method TO-3, the recovery of surrogate fluorobenzene was outside control limits due to high level hydrocarbon matrix interference. Data is reported as qualified. i <20% of one filter pack volume was purged prior to sampling. ◊ Listed ESLs are for the the evaluation of shallow (collected from depths ≥5 feet bgs) soil gas samples and were provided on Table E-2 in the CRWQCB-San Francisco Bay Region's Screening for Environmental Concerns at Sites with Contaminated Soil and Groundwater, Interim Final November 2007, updated December 2013. ♦
* Listed ESLs do not apply to ambient air samples.

Soil gas sampling criteria are listed in the SWRCB's Low-Threat Underground Storage Tank Case Closure Policy, effective August 17, 2012. The Bioattenuation Zone is defined where:
1) there is a minimum of 5 vertical feet between the building foundation and the soil gas measurement, 2) the total petroleum hydrocarbon concentration in soil do not exceed 100 milligrams per kilogram, and 3) oxygen concentrations of greater than 4% are measured at the bottom of the 5 foot zone.

V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 3 of 3

N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW
01/27/93 -- 000000000000 1 000
03/23/93 -- 0000000000 1 00000
04/12/93 -- 0000000000 1 00000
05/13/93 -- 0000000000 1 00000
06/15/93 -- 0000000000 1 00000
07/14/93 -- 0000000000 1 00000
08/17/93 -- 0000000000 1 00000
09/15/93 -- 0000000000 1 00000
10/05/93 -- 0000000000 1 00000
11/16/93 -- 0000000000 1 00000
02/24/94 -- 0000000000 1 00000
05/27/94 0.02 00000000000 1 0000
08/31/94 0.02 000000000000 1 000
11/29/94 0.02 000000000000 1 000
02/23/95 0.02 000000000000 1 000
05/31/95 0.03 00000000000 1 0000
08/21/95 0.03 00000000000 1 0000
11/20/95 0.03 00000000000 1 0000
02/19/96 0.02 00000000000 1 0000
05/16/96 0.02 00000000000 1 0000
08/22/96 0.02 00000000000 1 0000
11/14/96 0.02 00000000000 1 0000
02/13/97 0.03 0000000000 1 00000
05/14/97 0.02 000000000 1 000000
08/12/97 0.02 00000000000 1 0000
11/11/97 0.02 00000000000 1 0000
02/11/98 0.03 0000000000 1 00000
05/05/98 0.03 0000000000 1 00000
07/31/98 0.03 00000000000 1 0000
11/11/98 0.02 0000000000 1 00000
02/26/99 0.02 00000000000 1 0000
05/28/99 0.02 0000000000 1 00000
08/24/99 0.01 00000000 1 0000000
11/05/99 0.02 000000000 1 000000
02/03/00 0.01 000000000 1 000000
05/02/00 0.01 -0.02 0000000000 1 00000
10/13/03 a 0.01 000000000000 1 000
03/11/04 0.038 00000000 1 0000000
09/22/04 0.03 0000000000 1 00000
09/26/05 0.06 0000000000 1 00000
02/03/06 a 0.03 0000000000 1 00000
07/25/06 b 0.05 0000000000 1 000 1 0
02/15/07 0.01 0000000000 1 00000
07/20/07 0.03 -0.08 000000000 1 000000
01/15/08 0.02 -0.08 000000000 1 000000
01/09/09 0.07 000000000 1 000000
03/03/10 0.064 000000000 11 00000
10/15/10 0.045 00000000 1 0000000
01/14/11 0.038 000000 1 000 1 00000
01/27/12 0.016 000000 1 000000000
07/02/12 000000 1 000000000
01/04/13 0.091 000000 1 000000000
07/23/13 0.038 000000 1 000000000
Average: 0.031 0000005037 23 125 0 1 0
Notes:
a
b
South San Francisco, California
TABLE 4

HISTORICAL GROUNDWATER GRADIENT DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
The groundwater gradient and flow direction(s) were evaluated using additional groundwater elevations from wells associated with San Mateo County site #550037, located across the street at 209 El Camino Real.

Groundwater Gradient
Date
Monitoring
The groundwater gradient and flow direction was evaluated using groundwater elevations that were calculated using depth to groundwater levels measured after purging activities began. (foot/foot)
Groundwater Flow Direction

0.051
V:\1857\active\chevron\211602175_chevron_306441_south_san_francisco\03_data\tables\306441_tables.xlsx Page 1 of 1

APPENDIX A
SMCHS-GPP Letter Dated April 9, 2013
and February 19, 2014 and SMCHS-GPP
Meeting Notes Dated June 11, 2013

MEMO TO FILE
DATE: June 11, 2013
TO: FILE
FROM: Deno Milano
SITE: Former Unocal #6980, 192 El Camino Real, SSF
Charles Ice and I met with Tom Graf and Bill Mitchell. Developer would like to excavate soil rather than install and operate remedial wells on the development and would like assurance no further remediation would be required following the excavation. We said we would consider this proposal if the registered professional could demonstrate excavation alone would be sufficient to satisfy low-threat case closure policy or RWQCB low-risk closure policy.

We recommended their proposal address the deep groundwater contamination separately from the shallow soil/perched groundwater contamination. We indicated we would probably need some form of post-excavation sub-slab vapor sampling to demonstrate the extent of their soil excavation was sufficient to mitigate potential indoor air risk. We also indicated the sub-slab vapor mitigation system should be installed in case the sub-slab vapor samples indicate potential inhalation risk remains following excavation. They were amenable to installing the sub-slab vapor probes and sub-slab vapor mitigation system. We mentioned there is always the potential excavation could uncover additional contamination above what we expected or that onsite remediation could be required if significant post-excavation risk remains. A well-planned proposal document may minimize this potential risk.

APPENDIX B
Revised Site Management Plan dated
May 31, 2013
.

Revised Site Management Plan
Chevron 306441
(Former Unocal No. 6980)
190-192 El Camino Real
South San Francisco, California
Submitted to:

Mr. Deno Milano, P.G.

San Mateo County Health System –
Groundwater Protection Program
2000 Alameda de Las Pulgas, Suite 100
San Mateo, CA 94403
Prepared for:

Mr. Eric Hetrick
Chevron Environmental Management
Company
6101 Bollinger Canyon Road
San Ramon, CA 94583
Submitted by:

Stantec Consulting Services Inc.
3017 Kilgore Road, Suite 100
Rancho Cordova, CA 95670
Stantec Project Number:
211602175.602.0301
May 31, 2013

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx i Table of Contents

1.0 INTRODUCTION ..................................................................................................................... 1

2.0 SITE DESCRIPTION ............................................................................................................... 2

2.1 SITE LOCATION ..................................................................................................................... 2

2.2 SITE BACKGROUND.............................................................................................................. 2

2.3 SITE GEOLOGY...................................................................................................................... 2

2.4 SITE HYDROGEOLOGY......................................................................................................... 3

2.5 PREVIOUS INVESTIGATIONS............................................................................................... 3

3.0 HYDROCARBON DISTRIBUTION IN UNSATURATED SOIL............................................ 11

3.1 LATERAL EXTENT OF SHALLOW UNSATURATED-ZONE IMPACTS ............................. 11

3.2 LATERAL EXTENT OF DEEPER UNSATURATED-ZONE IMPACTS ................................ 11

4.0 PROPOSED BUILDING PLANS .......................................................................................... 12

5.0 NOTIFICATIONS................................................................................................................... 13

5.1 REGULATORY OVERSIGHT ............................................................................................... 13

5.2 LEAD RESPONSIBLE PARTY.............................................................................................. 13

6.0 SUBSURFACE SITE ACTIVITIES ....................................................................................... 14

6.1 HEALTH AND SAFETY......................................................................................................... 14

6.2 WORKERS ............................................................................................................................ 14

6.3 WASTE DISPOSAL............................................................................................................... 15

6.3.1 Soil Management ................................................................................................... 15

6.3.2 Stockpiled Soil Verification Sampling and Analyses ............................................. 16

6.3.3 Soil Profiling and Disposal ..................................................................................... 16

6.4 AIR QUALITY MONITORING................................................................................................ 16

6.5 VAPOR MITIGATION SYSTEM............................................................................................ 17

7.0 REPORTING.......................................................................................................................... 18

8.0 LIMITATIONS AND CERTIFICATION.................................................................................. 19

9.0 REFERENCES CITED .......................................................................................................... 20

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
May 31, 2013
Table of Contents (Continued)
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx ii

LIST OF FIGURES
Figure 1 Site Location Map
Figure 2 Site Plan
Figure 3 Geologic Cross Sections
Figure 4 TPH-GRO Isoconcentration Map, Unsaturated Soil, 0-15 Feet BGS Figure 5 Benzene Isoconcentration Map, Unsaturated Soil, 0-15 Feet BGS Figure 6 TPH-GRO Isoconcentration Map, Unsaturated Soil, 15.5-30 Feet BGS Figure 7 Benzene Isoconcentration Map, Unsaturated Soil, 15.5-30 Feet BGS

LIST OF TABLES
Table 1 Historic Soil Analytical Data

LIST OF APENDICES
Appendix A San Mateo County Health System – Groundwater Protection Program Correspondence

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Introduction
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 1

1.0 Introduction
On behalf of Chevron Environmental Management Company (EMC), Stantec Consulting Services Inc. (Stantec), has prepared this Revised Site Management Plan (SMP) for future construction, excavation, and redevelopment activities at Former Unocal Service Station No. 6980 (Chevron Facility 306441) located at 190-192 El Camino Real, South San Francisco, California, Assessor’s Parcel Number 014-183-110 (the ‘Site’, Figure 1). This Revised SMP describes the Site history, the geology, the estimated distribution of petroleum hydrocarbons, and the protocols to be followed when working in the designated area of the former service station footprint which is known to or may have hydrocarbon impacts and in the event impacted soil and/or groundwater is encountered during construction, excavation, or redevelopment activities at the Site. This Revised SMP was developed in response to the San Mateo County Health System – Groundwater Protection Program (SMCHS-GPP) response letter, dated April 9, 2013 to Stantec’s Site Management Plan, dated October 31, 2012. A copy of the SMCHSGPP letter is included in Appendix A.

This Site is located on the northwestern portion of a property currently owned by Shamaim, Incorporated and the owner of the current shopping center is El Camino & Spruce, LLC; redevelopment is being managed by the property manager, W.T. Mitchell Group. EMC is not involved with or responsible for construction and redevelopment work. This Revised SMP is to be implemented by the party directing the subgrade work prior to commencement of the subgrade work in the designated area (hereafter defined as SMP Work Zone). The purpose of this SMP is to ensure that if hydrocarbon impacted soil, vapor, or groundwater are encountered, they will be managed properly and in accordance with this SMP.

In addition, details of a vapor mitigation system were requested from the SMCHS-GPP to be included in the SMP. EMC has conceptually agreed to the implementation of a vapor mitigation system beneath proposed Building A. The design of the vapor mitigation system will be provided in the corrective action plan (CAP)/remedial action plan (RAP).

2.0 Site Description

2.1 SITE LOCATION
The Site is located on the southeast corner of the intersection of the El Camino Real and Spruce Avenue, in South San Francisco, California (Figures 1 and 2), and is bordered by commercial and retail properties. The Site was formerly occupied by a Unocal-branded service station, which ceased operations in 1992. Former station facilities included a sales kiosk, two dispenser islands beneath a shared canopy, a service building (with two service bays and a sales office), and gasoline underground storage tanks (USTs) and associated product lines.

The three former gasoline USTs were located south of the dispenser islands. The product dispensers, associated piping, and steel-walled USTs were removed from the Site in April 1992.

A Firestone service building, including three service bays and an office, currently occupies the former location of the service station building.

2.2 SITE BACKGROUND
Near the end of 2007, W.T. Mitchell Group informed the SMCHS-GPP of plans to redevelop the property. In e-mail correspondence, dated December 3, 2007, the SMCHS-GPP informed the W.T. Mitchell Group that project approval could not be recommended until the risk to potential hypothetical future residents could be assessed, and the proposed development would not affect potential remediation efforts. In addition, the SMCHS-GPP requested a waste management plan for soil and groundwater generated during redevelopment activities. Since then, EMC has evaluated risks to future occupants of the two buildings proposed for the former service station site. SMCHS-GPP, in a letter dated August 6, 2012, has concurred that the results of this study indicate that residual petroleum impacts do not present unacceptable health risks to future occupants of Building B. Potential risks to Building A occupants can be reduced to a level of insignificance through engineering controls as discussed in Stantec’s Well Installation and Soil Vapor Extraction Pilot Test Report, dated March 22, 2013.

2.3 SITE GEOLOGY
The Site is located approximately one mile south of the base of San Bruno Mountain. Site geology consists of Pleistocene stream channel deposits comprised mostly of gray to brown sand and silt, which locally may contain clay, gravel, or boulders. A subsurface stream channel trends toward the northeast beneath Spruce Avenue. The alluvium lies above the surrounding Quaternary Colma Formation, which in this area consists of mostly yellowish-orange to gray sandy clay and silty sand (Bonilla, 1971). Previous investigations have identified that fill material is present at the Site to approximate depths between 7.5 and 15 feet below ground surface (bgs).

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Site Description
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 3 Historical and recent investigations have indicated that soil in the majority of borings consists mainly of fine-grained materials (silt and clay) extending from near ground surface to depths ranging from 7.0 feet (SB-5) to as deep as 40 feet bgs (SB-7), underlain by alternating layers of coarse-grained (sand/silty, sand/clayey, and sand) and fine-grained materials (silt/clay) to the maximum depth explored (65 feet bgs, MW-1). These coarse-grained and fine-grained strata appear to be relatively laterally continuous across the majority of the Site, with increased interbedding in the areas of borings MW-1/MW-1R and MW-2. Fill consisting mainly of finegrained material was documented in previous boring logs to depths of approximately 7.5 to 15 feet bgs. Soil deeper than approximately 40 feet bgs consisted predominantly of coarse-grained sediments (sand/silty sand/mixtures of gravel) to the maximum explored depth. Geologic cross sections are presented on Figure 3 and historic soil analytical data can be found in Table 1.

2.4 SITE HYDROGEOLOGY
With the exception of one boring where groundwater was not encountered (SB-13), first groundwater was present mainly within coarse-grained sediments (sand/silty sand) or finegrained materials (sandy silt/silt) in borings MW-7, SB-3, SB-4, and SB-6 through SB-8 at depths between approximately 30 feet and 57.5 feet bgs. Static groundwater levels within wells completed with shallower screens (MW-1R, MW-3R, MW-7 through MW-10) have historically ranged from 21.47 (MW-10) feet below top of casing (ft btoc) to approximately 35.83 ft btoc (MW-7).

Based upon an evaluation of moisture content and stratigraphy encountered at and above the water table, groundwater appears to be present under unconfined conditions. A perched groundwater zone beneath the Site was identified approximately 5 to 11.5 feet bgs and is thought to be related to the fill/native soil interface and/or the storm drain north of the Site (Stantec, 2012a).

2.5 PREVIOUS INVESTIGATIONS
In April 1992, a steel-walled 12,000-gallon capacity super unleaded gasoline UST and two steelwalled 12,000-gallon capacity regular unleaded gasoline USTs were removed along with the product dispensers and associated piping. No apparent holes or cracks were observed in the tanks at the time of removal. Soil samples were collected from the product piping trenches at a depth of approximately 3.5 feet bgs (P1, P1-1, P2, P3, and P4); beneath each fuel UST (A1 and A2, B1 and B2, and C1 and C2) at depths of 13.5 feet bgs; and from the fuel UST pit sidewalls (SW-1 through SW-3) at depths of 12.5 feet bgs. The highest concentrations of petroleum hydrocarbons were observed beneath the southeastern corner of the fuel UST excavation (B2 and C2), with the highest concentrations of total petroleum hydrocarbons as gasoline (TPHg)

Petroleum hydrocarbons were also detected in samples collected from the excavation sidewalls, and in soil from the product line trenches with the highest detections of TPHg (2,100 mg/kg, P2 and 12,000 mg/kg, P4) and benzene (16 mg/kg, P2 and 14 mg/kg, P4) reported north-northeast (P2) and west-northwest (P4) of the fuel UST excavation (Kaprealian Engineering Incorporated [KEI], 1992a). The dimensions of the initial excavations were not documented. Approximately 350 cubic yards of excavated soil were removed from the Site (KEI, 1992b).

In July 1992, over-excavation and additional assessment of subsurface conditions was performed beneath and in the vicinity of the south/southeastern portion of the fuel UST pit; and additional excavation was performed approximately 3 feet laterally beyond the northnorthwestern fuel UST excavation limits in the vicinity of sample SW2, and beneath initial product line samples P2 and P4. An additional 7.5 feet of hydrocarbon-impacted soil was excavated from the bottom of the fuel UST pit beneath samples A2 through C2 to a maximum depth of 21 feet bgs, and confirmation soil samples were collected from this area (A2[21], B2[21], and C2[21]). A confirmation sidewall sample was collected from the excavation expanded laterally beyond SW2 (SW2[3]), and an additional sample (BS[16]) was collected approximately 17 feet southeast of fuel UST excavation sampling point C2 to further characterize soil to the southeast. The dimensions of additional excavation in the vicinity of product line sample P2 were approximately 12 feet by 12 feet by 12 feet deep, and confirmation samples were collected from the base (P2[12]) and sidewalls (P2[SW1 through SW3]). The dimensions of additional excavation in the vicinity of product line sample P4 were approximately 15 feet by 18 feet by 8.5 feet deep, and confirmation samples were also collected in this area from the base (P4[8.5]) and sidewalls (P4[SW1 through SW3]). Based on the results of this investigation, KEI concluded that the majority of petroleum hydrocarbon-impacted soil had been removed from the Site, with the highest residual concentrations limited to the southeastern corner of the fuel USTs (KEI, 1992a). A total of approximately 350 cubic yards of soil (approximately 200 cubic yards from the fuel UST pit, an additional 100 cubic yards combined from the fuel UST excavation and product line trench excavations, and approximately 50 cubic yards from the pump islands) were removed from the Site (KEI, 1992b).

In January 1993, KEI supervised the installation of three groundwater monitoring wells to further evaluate the presence of petroleum hydrocarbons in soil and groundwater beneath the Site.

The wells were completed at depths of 65 feet (MW-1) and 60 feet bgs (MW-2 and MW-3). The highest concentrations were present in soil to a depth of approximately 40 feet bgs, with maximum concentrations of 120,000 mg/kg TPHg; 480 mg/kg benzene, 1,000 mg/kg toluene, 1,300 mg/kg ethylbenzene, and 8,800 mg/kg total xylenes detected in the 20-foot sample from boring MW-3. Maximum concentrations of 55,000 micrograms per liter (µg/L) TPHg, 7,300 µg/L benzene, 9,300 µg/L toluene, 2,100 µg/L ethylbenzene, and 12,000 µg/L xylenes were detected in groundwater from well MW-1. The direction of groundwater flow was established toward the west at a hydraulic gradient of 0.036 ft/ft (KEI, 1993).

Groundwater monitoring and sampling of the well network continued to be implemented at the Site. In correspondence dated March 17, 1997, Unocal requested that the Site be considered for closure, as it had met the California Regional Water Quality Control Board’s (CRWQCB) criteria for classification as a low-risk case.

In a letter dated May 2, 2000, the San Mateo County Health Services Agency (SMCHSA) indicated that the “site may be appropriate for closure review”, and requested the submittal of a case closure summary. According to a phone conversation between ENSR and Gettler-Ryan Incorporated (GR), this document was reportedly submitted by GR, and groundwater monitoring and sampling program was suspended, pending the agency’s review and response to the closure request. According to GR, a new regulatory case worker was assigned the Site, and this closure request was never reviewed (ENSR, 2005). The groundwater monitoring and sampling program at the Site was suspended from May 2000 through October 2003, at which time it was reinstated at the direction of ENSR, the new lead consultant at the time.

In a letter dated January 13, 2005, the SMCHSA completed a review of the project file. The agency did not grant closure, stated that impacts to soil and groundwater were not fully characterized, and requested a work plan to further assess soil and groundwater impacts and further evaluate the westerly groundwater gradient beneath the Site. The hydraulic gradient was inconsistent with the northerly direction of groundwater flow reported beneath an adjacent site located at 209 El Camino Real.

In April 2005, ENSR submitted a work plan for further assessment (ENSR, 2005), which was conditionally approved by the San Mateo County Health Department (SMCHD) as stated in their letter dated July 28, 2005.

In June 2006, ENSR oversaw an additional investigation to further delineate petroleum hydrocarbons, including methyl tertiary butyl ether (MTBE), in soil and groundwater laterally and vertically beneath the Site, to investigate the presence of additional product piping near the former dispensers on the sides opposite the location of the excavation of pre-existing product lines, and to further evaluate the hydraulic gradient. Eight soil borings (SB-1 through SB-8) were advanced to first groundwater, and were completed at depths ranging from approximately 35 to 45 feet bgs. Two shallow hand augered borings (HA-1 and HA-2) were advanced to 3.5 feet bgs in the vicinity of product lines previously located northwest of the former fuel UST pit.

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Site Description
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 6 One groundwater monitoring well (MW-7) was completed at a depth of 46 feet bgs, southeast of the former fuel UST pit. The results of the investigation indicated that the highest concentrations of petroleum hydrocarbons in soil were present in the former source areas, with the majority of impacts observed between approximately 10 and 20 feet bgs, except in boring SB-1, where the highest impacts were observed between 25 and 30 feet bgs. Based upon these findings, and the attenuation of concentrations with depth, ENSR concluded that the lateral and vertical extent of petroleum hydrocarbons had been delineated, except north of SB6. The results of groundwater sampling indicated that the lateral extent of dissolved-phase hydrocarbons had been delineated to the west and south, except for MTBE in well MW-5. The presence and magnitude of dissolved hydrocarbon concentrations in borings north (SB-4 and SB-6) and east (SB-7 and SB-8) of the former source areas on-site were not consistent with the historical hydraulic gradient beneath the Site. Based upon this, and a detailed evaluation of groundwater data and corresponding hydraulic gradients beneath the Site in comparison to data associated with wells located nearby at 209 El Camino Real, the divergent hydraulic gradient has likely been influenced by the concrete storm drain (an unnamed tributary to Colma Creek), and the presence of a mapped paleochannel of the tributary in the area. This concrete channel was documented to extend beneath and parallel to Spruce Avenue. According to the results of ground penetrating radar (GPR) testing, evidence of additional product piping was not observed in the area of the product dispensers (ENSR, 2006).

In a letter dated November 21, 2007, SMCHS-GPP reviewed ENRS’s 2006 report, and requested a work plan, proposing the following: (1) further assessment of hydrocarbon impacts north/northwest of boring SB-6 and in the area of SB-5, (2) the collection of soil vapor samples beneath the office building to evaluate the potential vapor intrusion risk, and (3) the installation of additional wells with shallower screen intervals near existing wells MW-1 and MW-3 to assess dissolved-phase hydrocarbons near the groundwater table. In electronic correspondence, dated December 3, 2007, the SMCHS-GPP became aware of the property owner’s plans to redevelop the Site. The proposed plans included the construction of a shopping center with possible residential dwellings.

In April 2008, ENSR submitted a work plan to the SMCHS-GPP (ENSR, 2008), which was conditionally approved by the agency as stated in their letter, dated November 13, 2008.

However, due a change in consultant management responsibilities from ENSR to ARCADIS, and further discussion of the redevelopment plans between ARCADIS and property owner, W.T.

Mitchell Group, which would require amendments to the work plan submitted by ENSR, ARCADIS requested approval from the SMCHS-GPP to submit a revised work plan (ARCADIS, 2009a). ARCADIS submitted an unsolicited revised work plan to the SMCHS-GPP in September 2009 (ARCADIS, 2009b). In correspondence dated October 8, 2009, the SMCHSGPP issued a notice of violation (NOV) to Chevron for not meeting past agency directives. In correspondence dated October 10, 2009, the SMCHS-GPP conditionally approved ARCADIS’ revised work plan. ARCADIS provided a response to the NOV and the agency’s October 10, 2009 letter, which was documented in correspondence dated November 4, 2009 (ARCADIS, 2009c).

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Site Description
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 7 In February 2010, ARCADIS observed the installation of two groundwater monitoring wells (MW-1R and MW-3R), the installation of seven multilevel soil vapor probes (SV-2 through SV-8) across the Site, the advancement of five soil borings (SB-9 through SB-13) along the perimeter of the Site, and the installation of one sub-slab vapor point (SSV-1) beneath the tire storage area of the Firestone warehouse building. Based upon the results of this investigation that were summarized in a site conceptual model (SCM, ARCADIS, 2010), ARCADIS concluded and recommended the following:
(1) Petroleum hydrocarbons in soil were laterally defined within the unsaturated zone (0 to 30 feet bgs) downgradient to the west/southwest (SB-9 and SB-13), and upgradient to the east (SB-11). Vertical delineation was also achieved within and in the vicinity of the source area to the north, northwest, west and south.
(2) The lateral extent of the dissolved plume had been delineated downgradient (southwest) of the source area. However, the presence of petroleum hydrocarbons exceeding CRWQCB residential and commercial risk-based environmental screening levels (ESLs, where groundwater was and was not considered of beneficial use) in the grab sample from boring SB-11 indicated that the dissolved plume has not been delineated to the east/northeast.
(3) Based upon the results of a Tier I screening of soil vapor sampling results, which exceeded CRWQCB residential and commercial ESLs for vapor intrusion, ARCADIS recommended the performance of a Tier II risk-based human health assessment to further evaluate this exposure pathway.
(4) The destruction of wells MW-1 through MW-3, MW-5 and MW-6, due to rising groundwater levels over time resulting in submerged screens. As also previously indicated by the SMCHS-GPP, dissolved concentrations in these wells over recent sampling events were no longer representative, and likely underestimated the presence of petroleum hydrocarbons isolated at and above groundwater (encountered during the time of sampling of newly installed wells and boring between approximately 30 and 37.5 feet bgs).

In correspondence dated February 14, 2011, the SMCHS-GPP questioned whether the soil data from borings MW-1R, MW-3R, SV-2 through SV-8, and SB-9 through SB-13 was representative of impacts in the subsurface, based upon the methodology of sample collection. The agency commented that provided that the data was representative, the lateral extent of hydrocarbon impacts within the unsaturated zone had been delineated across the Site. The agency concurred with ARCADIS’ conclusion to destroy wells MW-1 through MW-3, MW-5 and MW-6, and its recommendation for further assessment of the stability of the dissolved plume to the east. The agency also recommended further assessment northeast of boring SB-6 to examine this possible preferential migration pathway, and the installation of an additional well downgradient (southwest), as well MW-5 was installed with a screen interval that has been determined to no longer be a representative source of data. The SMCHS-GPP also

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Site Description
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 8 recommended further investigation of soil vapor impacts northeast of SV-9, and the completion of additional sub-slab soil vapor probes beneath the Firestone office building to more accurately evaluate soil vapor within the plume, as proposed in a previous work plan. The agency also indicated that the screening level risk evaluation was not justified based on several factors, and that the request for a Tier II human health risk-based evaluation was not justified, based upon soil vapor concentrations significantly exceeding CRWQCB ESLs.

Stantec submitted documentation of uploading of revised GeoBore files for MW-1R, MW-3R, SB-9 through SB-13, and SV-2 through SV-8 to GeoTracker by ARCADIS. These GeoBore files are more accurate than those uploaded with ARCADIS’ original Conceptual Site Model and Human Health Screening Risk Evaluation, dated September 30, 2010. Additionally, Stantec noted that ARCADIS indicated that the well construction details on the boring log for SV-4 are correct, and the text in the report regarding the construction of this well was incorrect.

In a letter dated March 18, 2011 (ARCADIS, 2011), ARCADIS provided a rationale for defending the validity of the soil analytical results from the borings referenced above. Their claim was rejected by the SMCHS-GPP in their letter, dated May 3, 2011. As a result, the agency requested the collection of confirmation soil samples near MW-1R, MW-3R, and SB-11, and from depths less than 10 feet bgs near soil vapor wells SV-2 through SV-4.

In October 2011, Stantec oversaw the installation of two additional groundwater monitoring wells (MW-8 and MW-9) to further evaluate the lateral extent of dissolved-phase hydrocarbons downgradient (southwest) and upgradient (northeast) of the former UST pit, respectively. Wells MW-8 and MW-9 were completed at depths of 40 feet bgs. In addition, Stantec oversaw the installation of one dual completion soil vapor well SV-9 (two vapor probe implants set at depths of approximately 5 and 10 feet bgs) to assess petroleum hydrocarbons in soil vapor north of SV2, the installation of sub-slab probe SSV-2 beneath the Firestone building, and the destruction of monitoring wells MW-1 through MW-3, MW-5, and MW-6 on Site. In addition, Stantec oversaw the installation of sub-slab probe SSV-3 beneath the Firestone building. A total of twelve soil samples were submitted for analysis from groundwater monitoring well MW-8 and soil vapor well SV-9 (Stantec, 2012a).

In September 2012, Stantec submitted correspondence to the SMCHS-GPP justifying the representativeness of the soil vapor sampling results reported in Stantec’s May 2012 assessment report (Stantec, 2012a). The letter defended the volume of subsurface air purged during vapor sampling activities at sub-slab probes SSV-2 and SSV-3, citing that the volume of purged air met the guidelines established in the Advisory Active Soil Gas Investigation put forward by the California Environmental Protection Agency – Department of Toxic Substance Control (DTSC), the California Regional Water Quality Control Board – Los Angeles Region, and the CRWQCB-SFBR in April 2012. Additionally, Stantec verified that 6-liter Summa canisters were used for purging soil vapor wells and 1-liter Summa canisters were used for purging sub-slab probes; given that Stantec’s field procedures in our May 2012 assessment report stated that 6-liter Summa canisters were used to purge each sampling location, this discrepancy explained why incorrect purging rates were calculated for the sampling event.

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Site Description
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 9 Stantec concluded that the soil vapor sampling results presented in the May 2012 assessment report were representative (Stantec, 2012b).

In October 2012, Stantec installed groundwater monitoring well MW-10 in the northwest portion of the Site to evaluate the extent of petroleum hydrocarbon impact to soil and groundwater upgradient of the source area. The well was completed to a depth of 40 feet bgs. Laboratory analysis of soil samples collected from the borehole for well MW-10 indicated the presence of up to 0.88 mg/kg TPH-GRO. Stantec concluded the extent of petroleum hydrocarbons in soil and groundwater had been adequately assessed at the Site (Stantec, 2012e).

In October 2012, Stantec submitted a work plan for the installation of remediation testing wells and for the performance of a soil vapor extraction (SVE) pilot test at the Site (Stantec, 2012c).

Additionally, Stantec submitted a SMP that described protocols to be followed in the event that petroleum hydrocarbon impacted soil is encountered during construction, excavation, or redevelopment activities at the Site (Stantec, 2012d).

Between January 24 and February 1, 2013, Stantec destroyed two groundwater monitoring wells (MW-1R and MW-3R) and installed one deep SVE well (SVE-1D), one shallow SVE well (SVE-2S), four observation wells (OBS-1 through OBS-4), and two replacement groundwater monitoring wells (MW-1RA and MW-3RA). In addition to functioning as replacement groundwater monitoring wells, MW-1RA and MW-3RA were used as observation wells for pilot test activities (Stantec, 2013).

Between February 4 and 9, 2013, an SVE pilot test was conducted to test the feasibility of SVE as a potential remedial option. Based on the results of the SVE pilot test, Stantec concluded the following:
 The rate of mass removal suggested SVE would remove petroleum hydrocarbons from the subsurface.
 Radius of influence was determined to be up to approximately 36 feet for SVE-2S and 15 feet for SVE-1D.
 Based on concentrations of organic lead in the extracted vapor, the estimated life of a catalyst cell (if used) would be less than two days; however, there may be pre-treatment alternatives that still allow for the use of a catalytic oxidizer. Sulfur concentrations could be managed by increasing operating temperatures.
 SVE is likely an effective technology for the remediation of residual petroleum hydrocarbon impacts to subsurface soil at the Site.
 The pilot test report recommended the implementation of a vapor mitigation system beneath the Building A footprint.

Stantec recommended a full-scale SVE system, including a potential air sparge option, be installed and operated at the Site (Stantec, 2013).

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Site Description
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 10 In a letter dated April 9, 2013, the SMCHS-GPP accepted the results of the 2011 and 2012 subslab vapor sampling results from SSV-2 and SSV-3 but could not accept results from well SV-9 due to questionable sampling procedures. The SMCHS-GPP additionally requested a revised SMP specifying when the plan is to be implemented, what the method, location, and frequency of air monitoring will be, and the requirements for implementation of engineering controls, including a description of the controls to be used. The SMCHS-GPP stated that it had not been demonstrated that SVE would sufficiently mitigate vapor intrusion risks to the proposed buildings or effectively remove the petroleum hydrocarbon source from the subsurface.

Consequently, the SMCHS-GPP requested engineering controls be considered and incorporated into the design of the proposed building to mitigate the risk of vapor intrusion and remediation wells/equipment for adequate remediation of residual hydrocarbons.

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Hydrocarbon Distribution In Unsaturated Soil
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 11

3.0 Hydrocarbon Distribution In Unsaturated Soil
Based on soil samples collected, the constituents of concern at the Site are: total petroleum hydrocarbons as gasoline range organics (TPH-GRO), benzene, and MTBE. An evaluation of the petroleum hydrocarbon distribution was performed for the upper (‘shallow’) and lower (‘deeper’) portions of the unsaturated zone, from approximately ground surface to 15 feet bgs, and 15.5 feet bgs to 30 feet bgs, respectively. Discussion of the distribution of petroleum hydrocarbons within the upper/lower unsaturated and smear zones is presented below.

3.1 LATERAL EXTENT OF SHALLOW UNSATURATED-ZONE IMPACTS
The greatest impacts of contaminants of concern (COCs; TPH-GRO and benzene, toluene, ethylbenzene, total xylenes [BTEX]) in shallow (0 to 15 feet bgs) unsaturated-zone soil were reported in samples located near or north/northeast of the fuel USTs in the vicinity of the previously excavated areas of the eastern and westernmost dispenser islands, and beyond these areas beneath the northern portion of the Site.

Figures illustrating TPH-GRO and benzene concentrations within the upper unsaturated soil zone are presented as Figures 4 and 5, respectively.

3.2 LATERAL EXTENT OF DEEPER UNSATURATED-ZONE IMPACTS
The highest concentrations of COCs in deeper (15.5 to 30 feet bgs) unsaturated-zone soil were reported in samples located immediately east and southeast of the fuel USTs (SB-1, MW-1 and MW-1R) and in the vicinity of the previously excavated area of the easternmost product dispensers.

Figures illustrating TPH-GRO and benzene concentrations within the deeper unsaturated soil zone are presented as Figures 6 and 7, respectively.

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Proposed Building Plans
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 12

4.0 Proposed Building Plans
According to the W.T, Mitchell Group, which is managing project redevelopment, the property owner is proposing to redevelop the Site and much larger existing shopping center with multiple buildings, a parking lot, and improved landscaping on the entire property as shown below in a drawing by project architect Johnson Lyman Architects of Walnut Creek, California.. Based on architectural drawings and preliminary grading plans, the new proposed buildings within the Site boundaries do not have a basement and appear to be designed with a slab on grade. During redevelopment activities, petroleum hydrocarbon-impacted soil and/or groundwater may be encountered; therefore, this SMP is designed to outline the process for effectively managing any impacted soil and/or groundwater that may be encountered during demolition and redevelopment activities. It is the responsibility of the party directing the execution of the subgrade work to implement this Revised SMP and provide specified notifications.

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Notifications
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 13

5.0 Notifications
Prior to construction, excavation, or development of areas within the SMP Work Zone identified on Figure 2, the project developer must notice the agency (SMCHS-GPP) and the RP (EMC) and the SMP must be implemented by the party directing the subgrade Site work. Any work that encounters impacts unexpectedly outside of the Site boundaries must stop immediately and the agency must be promptly notified by the developer; however, impacts outside of the SMP Work Zone are not likely related to the former UST release and are outside the scope of this Revised SMP. Any onsite inspection of known or suspected impacted soil and/or groundwater must be made by a qualified person (geologist, engineer, environmental consultant, etc.).

5.1 REGULATORY OVERSIGHT
Permitting, inspection, and/or plan approvals may be required before work can begin. Prior to any Site construction, excavation, or development activities the following regulatory oversight agency must be contacted by the contractor, subcontractor, and/or lead consultant designated to perform the work.

Mr. Deno Milano, P.G.

San Mateo County Health System – Groundwater Protection Program 2000 Alameda de Las Pulgas, Suite 100
San Mateo, CA 94403
(650) 372-6292

5.2 LEAD RESPONSIBLE PARTY
Prior to any Site construction, excavation, or development activities the RP lead point of contact must be notified by the contractor, subcontractor, and/or consultant designated to perform the work. Any changes to the point of contact subsequent to submittal of the SMP will be communicated to the regulatory agencies and W.T, Mitchell Group in writing. The primary RP point of contact is:

Eric Hetrick
Chevron Environmental Management Company
6101 Bollinger Canyon Road
San Ramon, CA 94583
(925) 790-6491

6.0 Subsurface Site Activities

6.1 HEALTH AND SAFETY
Upon information or notification that work will be conducted within the SMP Work Zone as specified on Figure 2, the party directing subgrade work will appoint an observer to ensure relevant provisions of the SMP are followed and to stop redevelopment work as required. Soil management will then be completed by a representative designated by the party directing subgrade work. For work conducted within the SMP Work Zone (Figure 2), contractors, subcontractors, and consultants performing work in this area must generate a site-specific Health and Safety Plan (HASP) for the proposed scope of work as required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120). The document will be reviewed and signed by all personnel prior to performing work at the Site.

The contractor, subcontractor, or consultant implementing the SMP shall designate a site health and safety officer (SHSO) who possesses an understanding of work with and around hazardous materials. When operations are occurring in areas known to have been impacted by petroleum hydrocarbons, it is the responsibility of the contractor, subcontractor, or consultant’s SHSO to ensure that workers are appropriately trained and certified, and that air quality is monitored to ensure exposure to COCs in the worker’s breathing zone does not exceed respiratory and permissible exposure limits. In the event of an emergency, it is the responsibility of the contractor, subcontractor, or consultant to stabilize the situation prior to making any notifications.

6.2 WORKERS
Any workers with the responsibility to manage soil with petroleum impacts must have completed the OSHA 40-hour Hazardous Waste Operations and Emergency Response (HAZWOPER) training course and all subsequent eight-hour, yearly refreshers.

These workers will be required to wear, at a minimum, “Level D” personal protective equipment, which includes but is not limited to appropriate clothing that will limit dermal contact with soil and groundwater, appropriate face shield and/or eye protection, and hydrocarbon resistant gloves.

Workers will have respirators with organic vapor cartridges on hand at all times and will have documentation of completion of a fit test with those respirators. Workers will also be required to demonstrate that they are physically capable of working onsite by providing a medical clearance signed by a licensed physician within the last year. A fire extinguisher, first-aid kit, and eyewash station must be made available and readily accessible to workers while onsite.

6.3 WASTE DISPOSAL
Any soil identified as having petroleum hydrocarbon impacts during trenching, demolition work, grading, foundation excavation, utility installation, or any other construction related activity shall be segregated from clean soils and either immediately removed or temporarily stockpiled onsite in a controlled environment (e.g. covered soil bin or covered stockpile) pending transportation offsite to an approved waste disposal facility. When possible, existing soil analytical data will be used to pre-profile impacted soils for disposal.

6.3.1 Soil Management
Shallow soil in areas of the Site is impacted from previous gasoline service station operations.

Based on results of previous environmental investigations at the site, petroleum hydrocarbonimpacted soil is shown on Figures 4 through 7. Future precautions, including dust suppression/control, should be taken into consideration with the possibility of encountering impacted shallow soil. Prior to soil related construction activities in the SMP Work Zone shown on Figure 2, notifications as required will be made to the appropriate parties.

During construction activities workers should monitor for evidence of impacted soil. A SHSO will be onsite during soil related construction activities that are planned within the Site boundaries (Figure 2). The SHSO should have appropriate resources to assess the soil using proper tools and equipment (e.g. photo-ionization detector [PID]), and the potentially impacted soils will be segregated from any soil which, based on field readings, is determined to be clean.

Any soils with detectable PID concentrations will be segregated for further analysis, as described in section 6.3.3.

Re-use or further handling of any soils verified to be clean will be the responsibility of the party directing the subgrade work. Soils determined to be clean based on field readings will be stockpiled for verification sampling (see section 6.3.2) and will be classified as clean based on criteria established in the SMCHS’s Characterization and Reuse of Petroleum Hydrocarbon Impacted Soil, dated December 2006. Any soils which appear clean but are determined by sampling to be impacted will be managed in accordance with the procedures outlined in section

6.3.3 of this SMP.

Soil either waiting to be removed as determined to be impacted or waiting to be verified as clean will be contained onsite and covered at all times except when the soil is being handled.

Covered bins are the preferred storage method for impacted soils. If bins are unable to be used due to volume, soil may be temporarily stockpiled pending priority removal based on the waste hauler’s schedule.

Any stockpiles will be covered with plastic protective sheeting and secured with sandbags or by other means to prevent the sheeting from becoming dislodged. In addition, temporary berms will be placed around any stockpiles to prevent sediment run-off. If sediment run-off from the site is anticipated to potentially impact city storm drains, all storm drains will be protected and a

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Subsurface Site Activities
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 16 storm water prevention pollution plan (SWPPP) submitted to the State Water Resources Control Board.

6.3.2 Stockpiled Soil Verification Sampling and Analyses Stockpiled soil suspected to be clean will be characterized according to Environmental Protection Agency (EPA) test method SW-846 to determine if the soil is eligible for reuse. The number of soil samples collected will be based on the volume of the stockpile as required by EPA SW-846. For stockpiles <500 cubic yards, a discrete sample will be collected for every 25 cubic yards. Soil samples will be collected by advancing two-inch diameter by three or six-inch long brass or stainless steel sample liners into soil locations that are random, uniform or biased toward hotspot areas. Methods for determining sample locations will be submitted to the SMCHS-GPP for approval prior to sampling. Each sample will be sealed with Teflonsheeting and plastic caps. Samples will then be labeled, placed on ice in an insulated container, and transported under chain-of-custody to a California State-certified laboratory. Soil samples will be analyzed for the presence of TPH-GRO, total petroleum hydrocarbons – diesel range organics (TPH-DRO), BTEX, fuel oxygenates, and naphthalene. The samples may be analyzed on a 24-hour turn-around-time to determine if the soil can be reused or if additional analysis is required. All soil sampling will be conducted under the supervision of a California registered Professional Geologist or Engineer. A work plan will be submitted to the SMCHS-GPP for approval prior to reuse of any stockpiled soil. Any soil characterization and reuse will be completed in accordance with SMCHS’s Characterization and Reuse of Petroleum Hydrocarbon Impacted Soil, dated December 2006.

6.3.3 Soil Profiling and Disposal
Pre-existing and any new laboratory analytical data will be used to profile excavated soil determined to be impacted for offsite disposal. With acceptance of the soil profile data, the soil will be transported by a waste hauler under manifest to a RP-approved, licensed disposal facility. The volume and weight of soil transported for disposal will be documented in waste transportation manifests and disposal facility weight scale tickets.

6.4 AIR QUALITY MONITORING
During soil excavation activities, ambient air quality monitoring will be conducted in the excavation worker’s breathing zone or between the worker’s breathing zone and the area being excavated to ensure exposure to hydrocarbon vapors does not exceed Federal and/or California OSHA permissible exposure limits. Hydrocarbon vapor concentrations will be monitored by use of a PID calibrated with isobutylene daily or as recommended by the manufacturer. Monitoring will be conducted at a minimum of every 15 minutes during the project while disturbing soils known to be impacted or suspected to contain impacts.

The action level for respirator use will be 5 parts per million (ppm) volatile organic compounds (VOCs) as measured by the PID sustained for two minutes. Work will not necessarily stop at

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Subsurface Site Activities
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 17 this level; however, respirators will need to be donned unless measures can be taken to reduce the exposure level. If necessary, actions will be taken to reduce the concentration using engineering controls such as water mist, spray foam, plastic cover, exhaust ventilation, etc. as appropriate based on field conditions.

The action level for stopping work will be 25 ppm VOCs as measured by the PID. Respirators will be donned and an attempt to determine and mitigate the cause of exposure will be made.

The use of engineering controls such as water mist, spray foam, plastic cover, exhaust ventilation, etc. will be implemented to attempt to bring concentrations in the worker’s breathing zone below stop work levels.

6.5 VAPOR MITIGATION SYSTEM
EMC has conceptually agreed to the implementation of a vapor mitigation system beneath proposed Building A at the Site. The vapor mitigation design will be provided in the CAP/RAP.

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Reporting
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 18

7.0 Reporting
A soil management summary report will be prepared by the RP or party directing the subgrade work and will include the following items:
 Details of field procedures and operations;
 Air monitoring records and any mitigation measures taken;  Documentation of soil/groundwater quantities removed for disposal and locations and extent of excavations;
 Tabulated results of any characterization sample analyses;  Copies of certified analytical reports and chain-of custody documentation; and  Waste disposal manifests.

The summary report will be uploaded to the State of California GeoTracker database per California AB2886.

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
Limitations And Certification
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 19

8.0 Limitations And Certification
This plan was prepared in accordance with the scope of work outlined in Stantec’s contract and with generally accepted professional environmental consulting practices existing at the time this report was prepared and applicable to the location of the site. It was prepared for the exclusive use of EMC, for the express purpose stated above. Any re-use of this report for a different purpose or by others not identified above shall be at the user’s sole risk without liability to Stantec. To the extent that this report is based on information provided to Stantec by third parties, Stantec may have made efforts to verify this third party information, but Stantec cannot guarantee the completeness or accuracy of this information. The opinions expressed and data collected are based on the conditions of the site existing at the time of the field investigation.

No other warranties, expressed or implied are made by Stantec.

Prepared By: Reviewed By:

Brian Goss Matthew Battin
Project Scientist Associate Scientist
Information, conclusions, and recommendations provided by Stantec in this document have been prepared under the supervision of and reviewed by the licensed professional whose signature appears below.

Name: Adrian Pérez, P.E. Signature:

Senior Engineer
Date: May 31, 2013 Stamp:
c. Mr. Eric Hetrick, EMC (via electronic upload to Strata) Mr. Robert C. Goodman, Rogers Joseph O’Donnell (via email to [email protected]) Mr. William T. Mitchell (Property Manager), W.T. Mitchell Group, P.O. Box 5127, Walnut Creek, CA 94596

9.0 References Cited
ARCADIS, 2009a. Response to Agency Comments & Revised Work Plan, Former Unocal Station #6980 (Chevron Facility #306441), 192 El Camino Real, South San Francisco, California. June 30.

ARCADIS, 2009b. Work Plan Addendum for Vapor Sampling and Additional Soil and Groundwater Characterization, Former Unocal Station No. 6980 (Chevron Site ID 306441), 190-192 El Camino Real, South San Francisco, California, San Mateo County Site No. 550098/RO708. September 9.

ARCADIS, 2009c. Response to Agency Correspondence, Former Unocal Station No. 6980 (Chevron Site ID 306441), 190-192 El Camino Real, South San Francisco, California, San Mateo County Site No. 550098/RO708. November 4.

ARCADIS, 2010. Conceptual Site Model and Human Health Screening Risk Evaluation, Former Unocal Station No. 6980 (Chevron Site ID 306441), 190-192 El Camino Real, South San Francisco, California, San Mateo County Site No. 550098/RO708. September 30.

California Regional Water Quality Control Board - San Francisco Bay Region. 2010. San Francisco Bay Basin (Region 2) Water Quality Control Plan (Basin Plan), Incorporating All Amendments Approved by the Office of Administrative Law as of December 31, 2010.

ENSR Corporation, 2005. Work Plan for Additional Subsurface Assessment, Former Unocal Facility No. 6980, 190 El Camino Real, South San Francisco, California. April 12.

ENSR Corporation, 2008. Work Plan for Environmental Investigation, Chevron No. 306441 (Former Unocal Service Station No. 6980), 190-192 El Camino Real, South San Francisco, California. April.

Kaprealian Engineering Incorporated, 1992a. Soil Sampling Report, Former Unocal Service Station #6980, 192 El Camino Real, South San Francisco, California. November 9.

Kaprealian Engineering Incorporated, 1992b. Stockpiled Soil Sampling and Disposal Report for Former Unocal Service Station #6980, 192 El Camino Real, South San Francisco, California. November 9.

REVISED SITE MANAGEMENT PLAN
Chevron 306441 (Former Unocal No. 6980)
References Cited
May 31, 2013
I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Reports\2013\306441_revised_smp_fnl_05312013.docx 21 Kaprealian Engineering Incorporated, 1993. Preliminary Groundwater Investigation at Former Unocal Service Station #6980, 192 El Camino Real, South San Francisco, California.

March 2.

Kaprealian Engineering Incorporated, 1994. Continuing Ground Water Investigation at Former Unocal Service Station #6980, 192 El Camino Real, South San Francisco, California.

July 15.

Kaprealian Engineering Incorporated, 1997. Report of ¼-Mile Radius Well Survey, Former Unocal Service Station #6980, 192 El Camino Real, South San Francisco, California.

March 6.

Pidwirny, Michael. 2006. “Fundamentals of Physical Geography, Chapter 7: Introduction to the Atmosphere, (a.) Atmospheric Composition.” PhysicalGeography.net. <http://www.phyhsicalgeography.net/fundamentals/7a.html>. July 3.

Stantec Consulting Services Inc., 2012a. Site Assessment, Chevron 306441 (Former Unocal Service Station #6980), 192 El Camino Real, South San Francisco, California. May 23.

Stantec Consulting Services Inc. 2012b. Soil Vapor Sampling Results Letter. Chevron 306441 (Former Unocal No. 6980), 190-192 El Camino Real, South San Francisco, California.

September 5.

Stantec Consulting Services Inc. 2012c. Well Installation and Soil Vapor Extraction Pilot Test Workplan. Chevron 306441 (Former Unocal No. 6980), 190-192 El Camino Real, South San Francisco, California. October 31.

Stantec Consulting Services Inc. 2012d. Site Management Plan. Chevron 306441 (Former Unocal No. 6980), 190-192 El Camino Real, South San Francisco, California. October

31. Stantec Consulting Services Inc. 2012e. Well Installation Report. Chevron 306441 (Former Unocal No. 6980), 190-192 El Camino Real, South San Francisco, California. November

27. Stantec Consulting Services Inc. 2013. Well Installation and Soil Vapor Extraction Pilot Test Report. Chevron 306441 (Former Unocal No. 6980), 190-192 El Camino Real, South San Francisco, California. March 22.

FIGURES

OFFICE

BUILDING

DRIVEWAY

SPRUCE AVENUE

EL CAMINO REAL

WAREHOUSE

SERVICE
BAYS
FORMER
USTs
FORMER

DISPENSER
ISLAND
FORMER

DISPENSER
ISLAND
FORMER
KIOSK

PLANTER

PLANTER B
B'
C
A
A'
C'
SV-7
Hydr
Hydr
Hydr
? ? ? ? ?
? ? ?
?
T T T
T

T T T T
?
? ? ?
?
FORMER

PRODUCT
TRENCH

PROPOSED

BUILDING-B FOOTPRINT

PROPOSED

BUILDING-A FOOTPRINT
SB-4
SB-10
SB-12
SV-9 SB-6
SV-2
SB-9
SB-5
SB-7
SB-11
SB-8
SB-2
SB-3
SV-3
HA-1
HA-2 SV-4
SV-6
SV-8
SV-5
SB-13
MW-8
MW-3RA
MW-1RA
MW-9
MW-7
SW2
B1
C1
A1
SW3
SW1
SW2(3)
A2
A2(21)
B2
B2(21)
SW4
C2
C2(21)
BS(16)
SB-1
P1
P1-1 P2(SW1)
P2(SW2)
P2
P2(SW3)
P2(12)
P4(SW3)
P4(SW1) P4P4(SW2)
P3-3
P3
P4/8.5
66" RCP

STORM DRAIN
MW-1
MW-3
MW-5
MW-6
MW-2
MW-10
SSV-1
SSV-2
SSV-3
OBS-2 OBS-3
OBS-4
OBS-1
SVE-2S
SVE-1D
MW-1R
MW-3R
FOR: FIGURE:

JOB NUMBER: DRAWN BY: CHECKED BY: APPROVED BY: DATE:
3 MDR MB DB 03/27/12
FILEPATH:M:\CHEVRON\306441\CROSS SECTION\FIG 3_SITE PLAN-XSECTION-RSRT_AP.dwg|miramirez|Apr 18, 2013 at 15:03|Layout: C SIZE LANDSCAPE

GEOLOGIC CROSS SECTIONS
CHEVRON 306441
(FORMER UNOCAL NO. 6980)
190-192 EL CAMINO REAL

SOUTH SAN FRANCISCO, CALIFORNIA
211602175
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
+40
+45 ELEV
+35
+30
+25
+20
+15
+10
+5
0 95 100 105 110 115 120 125 130 135 140 145 150 155 160 -5

SEA LEVEL
165 170 175 180 185 200 205 210

INTERSECTION B-B'
A A'
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
+40
+45 ELEV
+35
+30
+25
+20
+15
+10
+5
0 95 100 105 110 115 120 125 130 135 140 145 150 155 160 -5

SEA LEVEL
165
B B'
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
+40
+45 ELEV
+35
+30
+25
+20
+15
+10
+5
0 95 100 105 110 115 120 125 130 135 140 145 150 155 160 -5

SEA LEVEL
165 170 175
C C'

INTERSECTION A-A'

INTERSECTION A-A'
N

CROSS-SECTION LOCATION MAP
SCALE: 1" = 30'
0 10

APPROXIMATE SCALE IN FEET
0 10
(02/09/10) <22/<0.5/<0.5*
(06/07/06)
190/<0.025/<0.025
(06/08/06)
110/46/73
(06/08/06)
<50/14/0.82
510/160/32*
(02/10/10)
SB-12 SB-6
MW-7

PROJECTED
MW-5

PROJECTED

DESTROYED
MW-2

PROJECTED
DESTROYED MW-3 SB-2 PROJECTED
DESTROYED SB-7
MW-8
PROJECTED SB-8
SB-11
MW-9

PROJECTED
MW-1

PROJECTED

DESTROYED
MW-1R

PROJECTED PROJECTED

PROJECTED
SB-1
LEGEND:

SCREENED INTERVAL FOR

CLAY AND SILT (ML/CL/MH/CH)

CLAYEY SAND TO GRAVEL (SM/SW/SP/GC/GM/GW) MONITORING WELLS

WELL CASING

NESTED WELLS
mg/kg = MILLIGRAMS PER KILOGRAM
J/ = MICROGRAMS PER LITER
= METHYL TERTIARY BUTYL ETHER
TPPH = TOTAL PURGEABLE PETROLEUM HYDROCARBONS
MTBE

INTERPRETED SOIL STRATGRAPHIC BOUNDARY

SOIL BORING
TPPH CONTOUR IN SOIL (mg/kg)
733+&217285,1*5281':$7(5
J/

BGS = BELOW GROUND SURFACE
* = SAMPLE MAY NOT BE REPRESENTATIVE OF SITE
CONDITIONS DUE TO METHOD OF SAMPLE COLLECTION.

FILL
** = SAMPLE LOCATION EXCAVATED
00/00/00 *5$%*5281':$7(5$1$/<7,&$/'$7$
733+%HQ]HQH07%(

'$7(

'$7(
J/

FILL LINE (APPROXIMATE NATIVE/FILL INTERFACE)

H HISTORICAL HIGH WATER LEVEL

L HISTORICAL LOW WATER LEVEL
H
L
H
L
H
L
MW-1RA
SVE-2S OBS-3 OBS-4
OBS-1
OBS-1

INTERSECTION C-C
MW-1R
OBS-1 SVE-1D

PROJECTED
MW-1RA
OBS-4
OBS-3

PROJECTED
MW-3R

PROJECTED

DESTROYED
MW-3RA
? 100
?
1,000
?
?
1,000
100
1,000 100
?
?
?
?
?
?
?
?
? 100
?
100
1,000
10,000
1,000
1,000
100
100
100
00/00/00 *5281':$7(5$1$/<7,&$/'$7$
733+%HQ]HQH07%(

'$7(
J/
(01/06/12)
<22/<0.5/<0.5
(01/14/11)
940/2/16
(01/14/11)
940/2/16
(01/14/11)
(01/27/12)
27/<0.5/<0.5
(01/14/11)
<22/<0.5/13
(01/06/12) 57,000/8,700/1,500
21,000/9,700/770 (01/27/12)
120/2/21
?
?
?
?
?
?
?
?
?
00 PID (PHOTO IONZATION DETECTOR)READING

4.6 3.9

4.9 3.8

1.5 0.7

2.6 349

26.4 45.2

23.7 30.7

29.1 22.3

33.2 20.4

3.8 4.0

29.5 23.9

22.5 20.4

21.7 20.4

18.3 23.7

26.6 21.6

36.8 19.1

22.3 7.6

5.5 4.9

15.4 6.1

9.8 1.1

3.3 0.5

0.6 1.4

1.5 0.5

2.7 0.0

0.0 1.8

0.0 0.0

0.0 572
744
806
851
361
822
674
546
781
657
558
519
355
210
314
707

32.1 193
734
787
507
359

46.9 43.0

32.3 20.5

3.1 43.0

24.6 18.6

5.8 13.6
130
473
798
399
763

29.3 20.7

12.5 0.0

1.8 7.7

1.7 2.2

4.4 5.0

0.7 0.7

0.1 2.1

0.1 14.2

2.5 2.5

2.5 4.3

0.9 2.4

1.0 1.3

24.3 0.0

2.0 3.7

1.2 2.7

2.6 1.6

6.1 336

1.3 2.3

1.8 2.7

1.3 2.3

1.8 2.7

0.0 22.7
128

57.7 800

0.0 0.0

0.0 1.3

33.2 25.6

21.0 7.3

0.1 9.1

7.1 3.9

4.9 0.7

0.7 0.5

0.2 0.9

DESTROYED WELL
SM
ML/
MH
SM
ML/MH
SM
ML/MH
SM/GC
SM
ML
?
?
?
?
?
?
?
?
?
?
?
?
?
?
ML
ML
CL
SC/
ML
ML
ML
ML/
CL
SP
CH/
CL/
ML
SM
SM
SM
SM
SM
SM
ML
ML/MH
ML
ML SM
SM
SM
CL
ML
ML
SM
SM/SW
?
?
?
?
?
?
?
?
?
?
?
?
?
?
? ?
?
?
?
?
?
?
?
?
?
?
?

PIPELINE TRENCH

EXCAVATION

PIPELINE TRENCH

EXCAVATION
ML
GM/SM
SM
SM
ML/MH
SM
ML
SM/GM
ML
CH/CL
SP/SM
SP/SM
SP/SM
SM
SM
SM/
SP/
SW/
GM
SM
?
ML
ML
ML
ML
ML
SW/GW
SP/SM

CL/ML MH/ML
ML
SM
SM/SP
?
?
?
SM
ML
ML
ML
CL
ML
CL
ML
CL
ML
ML
CL
ML
ML
SM
SP/SM
SP/SM
?
SP/SM

ML ML ML
SP/SM
SP/SM
00/00/00 SOIL ANALYTICAL DATA (TPPH/Benzene/MtBE) (NA=NOT ANALYZED) (DATE)mg/kg (02/04/10)
(02/04/10)
(02/04/10)
(02/09/10)
<0.052/<0.0006/<0.0006*
(02/09/10)
(02/09/10)
(02/09/10)
(02/09/10)
(02/09/10)
(02/09/10)
(02/09/10)
(02/09/10)
(02/09/10)
(02/09/10)
(10/05/11)

6.5/<0.023/<0.023 <0.051/<0.0006/<0.0006*
<0.051/<0.0006/<0.0006*
<0.055/0.002/<0.0006*

0.57/<0.0006/<0.0006*

0.13/<0.0006/<0.0006*

0.18/0.001/<0.0006*
<0.059/<0.0007/<0.0007*
<0.058/<0.0007/<0.0007*
<0.058/<0.0007/<0.0007*
<0.057/<0.0006/<0.0006*
<0.053/<0.0006/<0.0006*
<0.055/<0.0006/<0.0006*

0.13/<0.0006/<0.0006*
(10/05/11)

1.9/0.0006/<0.0005
(10/05/11) 2,500/0.260/<0.011
190/<0.025/<0.025
290/<0.50/<0.50
8,800/<17/<17
930/<1.3/<1.3
<0.96/<0.0048/<0.0048
(06/07/06)
(06/07/06)
(06/07/06)
(06/07/06)
(06/07/06)
<0.93/<0.0046/<0.0046
(06/07/06)
(02/02/10) 1,700/<0.030/<0.030*
(02/02/10)
<0.046/<0.005/<0.005*
(02/02/10)
50/<0.027/<0.027*
(04/08/92)
82/1.4/NA**
(04/08/92)
16/0.26/NA
(02/01/10)
<0.050/<0.0006/<0.0006*
(02/01/10)
<0.048/<0.0005/<0.0005*
(02/01/10)
<0.057/<0.0006/<0.0006*
(02/01/10)
<0.048/<0.0006/<0.0006*
(04/08/92)
990/10/NA**
(04/08/92)

4.4/0.73/NA
(04/08/92)
19/0.29/NA
(06/06/06)
<0.93/<0.0046/<0.0046
(06/06/06)
<0.098/<0.0049/<0.0049
(06/06/06)
<0.096/<0.0048/<0.0048
(07/09/92)

6.2/<0.0050/NA (07/09/92) 12,000/14/NA**
(07/09/92)

7.8/0.040/NA**
(07/09/92)

9.5/0.074/NA (07/09/92)
67/0.13/NA
(07/09/92)

1.2/<0.0050/NA
(01/21/93)
530/2.8/NA
(01/21/93)

1.7/0.083/NA
(01/21/93) 4,300/21/NA
(01/21/93)
53/0.36/NA
(01/21/93)
19/0.71/NA
(01/21/93)
21/0.2/NA
(01/21/93)
11/0.87/NA
(01/21/93)
270/3.1/NA
(01/21/93)
110/2.3/NA
(01/21/93)
28/1.0/NA
(01/21/93)

7.5/1.1/NA
(01/21/93)

2.8/0.32/NA
(01/21/93)
<1.0/0.043/NA
(01/21/93)

2.4/0.30/NA
(01/21/93)

1.0/0.081/NA
(01/21/93)
<1.0/0.012/NA
(02/08/10)
14/0.011/0.017
(06/05/06) 1,500/<2.0/<2.0
(06/05/06)
2,100/<2.5/<2.5
(06/05/06)
<1.0/0.013/0.0061
(06/05/06)

3.1/0.016/<0.0047
(06/06/06)

5.1/0.092/0.022
(06/06/06)
<0.96/0.026/0.011
(06/06/06)
<0.98/0.034/0.027
(06/07/06)
<1.0/<0.0050/<0.0050
(06/07/06)
<0.94/<0.0047/<0.0047
(04/08/92)

1.6/0.009/NA
(04/08/92)
15/0.46/NA
(10/06/11)
<0.046/<0.0005/<0.0005
(10/06/11)
<0.043/<0.0005/<0.0005
(10/06/11)

1.6/<0.0005/<0.0005
(10/06/11)

0.24/<0.0005/<0.0005
(10/06/11)

0.086/<0.0005/<0.0005
(10/06/11)

0.70/<0.0005/<0.0005
(10/06/11)

0.34/<0.0005/<0.0005
(10/06/11)
<0.044/<0.0005/<0.0005
(10/06/11)
<0.043/<0.0005/<0.0005
(05/11/94)

1.3/0.021/NA
(05/11/94)

5.3/0.15/NA
(05/11/94)
<1.0/0.013/NA
(05/11/94)
<1.0/<0.005/NA
(05/11/94)
<1.0/<0.005/NA
(05/11/94)
<1.0/<0.005/NA
(05/11/94)
<1.0/<0.005/NA
(05/11/94)
<1.0/<0.005/NA
(05/11/94)
<1.0/<0.005/NA
(05/11/94)
<1.0/<0.005/NA
(06/07/06)
<0.94/<0.0047/<0.0047
(06/07/06)
<0.98/<0.0049/<0.0049
(02/04/10)
<0.51/0.0008/0.0007*
<0.51/0.0007/0.001*

0.17/0.003/0.002*
(02/10/10)

0.9/0.003/0.003*
<0.51/0.0006/0.003*
<0.55/0.0006/0.008*
<0.54/0.0006/0.002*
(02/04/10)
(02/04/10)
(02/10/10)
(02/10/10)
(02/10/10)
(02/04/10)

0.13/0.002/0.005*

0.18/0.002/0.008*

0.41/0.004/0.003*
(02/10/10)
<0.053/<0.0006/<0.0006*

1.2/0.01/0.001*
(02/04/10)
(02/04/10)
(02/10/10)

1.9/0.042/0.004*

1.6/0.053/0.007*
(02/10/10)
(02/10/10)
<0.58/0.0007/0.002*
(02/10/10)

0.88/0.019/0.001*
(02/10/10)
(02/01/10)
<0.050/<0.0006/<0.0006*
(02/01/10)
<0.048/<0.0005/<0.0005*
(02/01/10)
<0.057/<0.0006/<0.0006*
(02/01/10)
<0.048/<0.0006/<0.0006*
(06/05/06)

2.2/<0.0048/<0.0048
(06/05/06) 8,800/<20/<20
(06/05/06) 11,000/<17/<17
(06/05/06) 4,300/<7.1/<7.1
(06/05/06) 2,600/6.7/<5.0
(06/05/06)
260/1.2/<0.42
(06/05/06)
220/0.84/<0.42
(06/05/06)

6.7/0.28/0.069
(02/08/10)
<0.055/<0.0006/<0.0006*
(02/08/10)
<0.048/<0.0005/<0.0005*
(02/08/10)
<0.053/0.0008/<0.0006*
(02/08/10)

0.93/0.023/0.0008*
(02/08/10)
17/0.021/0.002*
(02/08/10)
11/0.056/0.002*
(02/08/10)
88/0.13/<0.031*
(02/08/10)
24/0.73/0.011*
(02/08/10)

4.6/0.071/0.009*
(02/08/10)

2.1/0.10/0.027*
(02/08/10)
2,100/2.0/0.094*
(02/08/10)
92/0.10/<0.034*
(02/08/10)
600/1.1/0.14*
(02/08/10)
160/0.12/0.0099*
(02/08/10)

1.5/0.029/0.046*
(02/08/10)

0.58/0.017/0.0011*
(02/01/10)
<0.053/<0.0006/<0.0006
(02/01/10)
<0.052/0.002/<0.0006
(02/01/10)

0.11/<0.0006/<0.0006
(02/01/10)

0.44/<0.0006/<0.0006
(02/08/10)

2.3/0.008/0.018
(02/08/10)

0.074/0.002/0.015
(02/08/10)

0.074/0.003/0.013
(02/08/10)

0.66/0.004/0.008
(02/08/10)
19/0.14/0.22
(02/08/10)
11/0.005/0.005
(02/08/10)
61/<0.029/<0.029
(02/08/10) 7,300/0.81/<0.34
(02/08/10) 5,100/<0.11/<0.11
(02/08/10)

3.4/0.005/0.001
(02/08/10)
49/<0.030/<0.030
(02/03/10)
25/<0.031/<0.031
(02/03/10)
14/<0.031/<0.031
(02/03/10)
19/0.032/0.032
(02/08/10)
72/<0.029/<0.029

TABLE
Sample
Name Lead 3
(mg/kg)
Excavation Soil Sampling
Gasoline UST Pit
A1 04/08/92 13.5 <1.0 0.011 <0.0050 <0.0050 <0.0050 -- -- -- -- -- -- -- -- -- -- A2 04/08/92 a 13.5 190 2.4 5.5 4.1 26 -- -- -- -- -- -- -- -- -- -- A2 (21) 07/02/92 21.0 6.6 0.58 0.062 0.27 0.55 -- -- -- -- -- -- -- -- -- -- B1 04/08/92 13.5 16 0.26 0.038 0.053 0.21 -- -- -- -- -- -- -- -- -- <0.050 B2 04/08/92 a 13.5 990 10 56 16 130 -- -- -- -- -- -- -- -- -- <0.050 B2 (21) 07/02/92 21.0 4.4 0.73 0.016 0.28 0.050 -- -- -- -- -- -- -- -- -- -- C1 04/08/92 13.5 6.3 0.060 0.017 0.019 0.028 -- -- -- -- -- -- -- -- -- -- C2 04/08/92 a 13.5 1,300 8.3 45 13 90 -- -- -- -- -- -- -- -- -- -- C2 (21) 07/02/92 21.0 340 0.92 5.9 4.0 32 -- -- -- -- -- -- -- -- -- -- SW1 04/08/92 12.5 1.6 0.0090 0.0059 <0.0050 0.013 -- -- -- -- -- -- -- -- -- <0.050 SW2 04/08/92 a 12.5 82 1.4 0.60 0.28 1.0 -- -- -- -- -- -- -- -- -- -- SW2 (3) 07/02/92 12.5 4.5 0.012 0.0050 0.011 0.0094 -- -- -- -- -- -- -- -- -- -- SW3 04/08/92 12.5 15 0.46 0.046 0.027 0.20 -- -- -- -- -- -- -- -- -- <0.050 SW4 04/08/92 12.5 19 0.29 0.32 0.32 2.2 -- -- -- -- -- -- -- -- -- -- BS (16) 07/02/92 16.0 4.0 0.033 0.032 0.018 0.084 -- -- -- -- -- -- -- -- -- -- Product Pipeline Trenches
P1 04/07/92 3.5 67 0.13 0.039 0.50 2.7 -- -- -- -- -- -- -- -- -- <0.050 P1-1 04/07/92 3.5 1.2 <0.0050 0.0072 <0.0050 0.0074 -- -- -- -- -- -- -- -- -- -- P2 04/07/92 a 3.5 2,100 16 12 15 85 -- -- -- -- -- -- -- -- -- -- P2 (12) 07/09/92 12.0 1.0 0.0095 0.0069 0.0077 0.019 -- -- -- -- -- -- -- -- -- -- P2 (SW1) 07/09/92 8.0 <1.0 0.012 <0.0050 0.015 0.033 -- -- -- -- -- -- -- -- -- -- P2 (SW2) 07/09/92 8.0 6.0 0.035 0.029 0.063 0.24 -- -- -- -- -- -- -- -- -- -- P2 (SW3) 07/09/92 8.0 11 0.16 0.024 0.22 0.12 -- -- -- -- -- -- -- -- -- -- P3 04/07/92 3.5 6.2 0.018 0.013 0.057 1.1 -- -- -- -- -- -- -- -- -- <0.050 P3-3 04/07/92 3.5 11 0.12 0.22 0.21 1.8 -- -- -- -- -- -- -- -- -- P4 04/07/92 a 3.5 12,000 14 41 96 1,100 -- -- -- -- -- -- -- -- -- P4 (8.5) 07/09/92 8.5 7.8 0.040 0.12 0.037 0.24 -- -- -- -- -- -- -- -- -- -- P4 (SW1) 07/09/92 5.0 6.2 <0.0050 0.0088 0.0067 0.044 -- -- -- -- -- -- -- -- -- -- P4 (SW2) 07/09/92 5.0 9.5 0.074 0.041 0.15 0.88 -- -- -- -- -- -- -- -- -- -- P4 (SW3) 07/09/92 5.0 31 <0.0050 0.054 0.032 1.1 -- -- -- -- -- -- -- -- -- -- Soil Borings
HA-1
HA-1 3.5' 06/06/06 3.5 2,200 <2.5 4.2 18 120 -- <2.5 -- <2.5 <500 <2.5 -- <2.5 <50 -- HA-2
HA-2 3.5' 06/06/06 3.5 <0.96 <0.0048 <0.0048 <0.0048 <0.0096 -- <0.0048 -- <0.0048 <0.96 <0.0048 -- <0.0048 <0.096 -- (feet, bgs)
Depth Toluene Ethylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 11,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
SB-1
SB-1 10' 06/05/06 10.0 2.2 <0.0048 <0.0048 0.037 0.085 -- <0.0048 -- <0.0048 <0.96 <0.0048 -- <0.0048 <0.096 -- SB-1 15.5' 06/05/06 15.5 8,800 <20 43 100 600 -- <20 -- <20 <4,000 <20 -- <20 <400 -- SB-1 18.5' 06/05/06 18.5 11,000 <17 99 130 810 -- <17 -- <17 <3,300 <17 -- <17 <330 -- SB-1 22.5' 06/05/06 22.5 4,300 c <7.1 54 52 310 -- <7.1 -- <7.1 <1,400 <7.1 -- <7.1 <140 -- SB-1 25.5' 06/05/06 25.5 2,600 6.7 41 29 170 -- <5.0 -- <5.0 <1,000 <5.0 -- <5.0 <100 -- SB-1 30' 06/05/06 30.0 260 1.2 5.9 2.5 17 -- <0.42 -- <0.42 <83 <0.42 -- <0.42 <8.3 -- SB-1 34' 06/05/06 34.0 220 0.84 4.7 2.2 15 -- <0.42 -- <0.42 <83 <0.42 -- <0.42 <8.3 -- SB-1 37.5' 06/05/06 37.5 6.7 0.28 0.39 0.11 0.76 -- <0.025 -- <0.025 <5.0 0.069 -- <0.025 <0.50 -- SB-2
SB-2 6.5' 06/05/06 6.5 1,500 <2.0 4.2 12 76 -- <2.0 -- <2.0 <400 <2.0 -- <2.0 <40 -- SB-2 10.5' 06/05/06 10.5 2,100 <2.5 <2.5 12 73 -- <2.5 -- <2.5 <500 <2.5 -- <2.5 <50 -- SB-2 17' 06/05/06 17.0 <1.0 0.013 <0.0050 0.013 0.0053 -- <0.0050 -- <0.0050 <1.0 0.0061 -- <0.0050 <0.10 -- SB-2 20.5' 06/05/06 20.5 3.1 0.016 0.011 0.039 0.14 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 -- SB-2 25.5' 06/06/06 25.5 5.1 0.092 0.017 0.077 0.33 -- <0.0047 -- <0.0047 <0.94 0.022 -- <0.0047 <0.094 -- SB-2 29.5' 06/06/06 29.5 <0.96 0.026 <0.0048 <0.0048 <0.0096 -- <0.0048 -- <0.0048 <0.96 0.011 -- <0.0048 <0.096 -- SB-2 33' 06/06/06 33.0 <0.98 0.034 <0.0049 0.0050 <0.0098 -- <0.0049 -- <0.0049 <0.98 0.027 -- <0.0049 <0.098 -- SB-3
SB-3 10.5' 06/06/06 10.5 1.4 c <0.0047 <0.0047 0.0096 <0.0094 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 -- SB-3 14.5' 06/06/06 14.5 1.9 c 0.0062 <0.0045 0.030 0.12 -- <0.0045 -- <0.0045 <0.91 <0.0045 -- <0.0045 <0.091 -- SB-3 21.5' 06/06/06 21.5 22 0.15 <0.025 0.44 1.2 -- <0.025 -- <0.025 <5.0 <0.025 -- <0.025 <0.50 -- SB-3 31.5' 06/06/06 31.5 2.2 d 0.076 <0.0047 0.016 0.031 -- <0.0047 -- <0.0047 <0.94 0.026 -- <0.0047 <0.094 -- SB-3 37' 06/06/06 37.0 1.5 d 0.073 0.0050 0.030 0.10 -- <0.0046 -- <0.0046 <0.93 0.021 -- <0.0046 <0.093 -- SB-4
SB-4 10.5' 06/07/06 10.5 <0.98 <0.0049 <0.0049 <0.0049 0.017 -- <0.0049 -- <0.0049 <0.98 <0.0049 -- <0.0049 <0.098 -- SB-4 20.5' 06/07/06 20.5 <0.94 <0.0047 <0.0047 <0.0047 <0.0094 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 -- SB-4 30.5' 06/07/06 30.5 <0.96 <0.0048 <0.0048 <0.0048 <0.0096 -- <0.0048 -- <0.0048 <0.96 <0.0048 -- <0.0048 <0.096 -- SB-5
SB-5 10.5' 06/07/06 10.5 <0.88 <0.0044 <0.0044 <0.0044 <0.0088 -- <0.0044 -- <0.0044 <0.88 <0.0044 -- <0.0044 <0.088 -- SB-5 20.5' 06/07/06 20.5 <0.94 <0.0047 <0.0047 <0.0047 <0.0094 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 -- SB-5 30.0' 06/07/06 30.0 <0.98 <0.0049 <0.0049 <0.0049 <0.0098 -- <0.0049 -- <0.0049 <0.98 <0.0049 -- <0.0049 <0.098 -- SB-6
SB-6 5' 06/06/06 5.0 190 c <0.025 <0.025 0.11 0.051 -- <0.025 -- <0.025 <5.0 <0.025 -- <0.025 <0.50 -- SB-6 10' 06/07/06 10.0 290 c <0.50 <0.50 1.1 7.2 -- <0.50 -- <0.50 <100 <0.50 -- <0.50 <10 -- SB-6 15' 06/07/06 15.0 8,800 <17 42 61 390 -- <17 -- <17 <3,000 <17 -- <17 <330 -- SB-6 20' 06/07/06 20.0 930 c <1.3 <1.3 5.7 18 -- <1.3 -- <1.3 <250 <1.3 -- <1.3 <25 -- SB-6 25.5' 06/07/06 25.5 <0.96 <0.0048 <0.0048 <0.0048 <0.0096 -- <0.0048 -- <0.0048 <0.96 <0.0048 -- <0.0048 <0.096 -- SB-6 30.5' 06/07/06 30.5 <0.93 <0.0046 <0.0046 <0.0046 0.007 -- <0.0046 -- <0.0046 <0.93 <0.0046 -- <0.0046 <0.093 -- SB-7
SB-7 15' 06/07/06 15.0 <1.0 <0.0050 <0.0050 <0.0050 0.0069 -- <0.0050 -- <0.0050 <1.0 <0.0050 -- <0.0050 <0.10 -- SB-7 30.5' 06/07/06 30.5 <0.94 <0.0047 <0.0047 <0.0047 0.0065 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 -- I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Tables\306441 TABLES.xlsx Page 2 of 10 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Toluene Ethylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 11,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
SB-8
SB-8 15.5' 06/07/06 15.5 <0.94 <0.0047 <0.0047 <0.0047 <0.0094 -- <0.0047 -- <0.0047 <0.94 <0.0047 -- <0.0047 <0.094 -- SB-8 30.5' 06/07/06 30.5 <0.98 <0.0049 <0.0049 <0.0049 <0.0098 -- <0.0049 -- <0.0049 <0.98 <0.0049 -- <0.0049 <0.098 -- SB-9
SB-9 (2.5) 02/03/10 + 2.5 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00089 <0.001 <0.026 -- SB-9 (5.0) 02/03/10 + 5.0 <0.047 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 <0.0073 <0.001 <0.021 -- SB-9 (7.5) 02/03/10 + 7.5 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.093 <0.001 <0.023 -- SB-9 (10.0) 02/09/10 + 10.0 0.060 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0037 <0.001 <0.024 -- SB-9 (12.5) 02/09/10 + 12.5 <0.057 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 <0.00086 <0.001 <0.026 -- SB-9 (15.0) 02/09/10 + 15.0 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.010 <0.001 <0.023 -- SB-9 (17.5) 02/09/10 + 17.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.0082 <0.001 <0.025 -- SB-9 (20.0) 02/09/10 + 20.0 <0.059 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 0.002 <0.001 <0.027 -- SB-9 (22.5) 02/09/10 + 22.5 <0.064 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.15 <0.0007 <0.00097 <0.001 <0.029 -- SB-9 (25.0) 02/09/10 + 25.0 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 0.0047 <0.001 <0.026 -- SB-9 (27.5) 02/09/10 + 27.5 <0.057 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 0.0014 <0.001 <0.026 -- SB-9 (30.0) 02/09/10 + 30.0 <0.052 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00079 <0.001 <0.024 -- SB-9 (32.5) 02/09/10 + 32.5 <0.053 0.0008 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00082 <0.001 <0.024 -- SB-9 (35.0) 02/09/10 + 35.0 <0.051 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00079 <0.001 <0.023 -- SB-9 (37.5) 02/09/10 + 37.5 0.056 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.00087 <0.001 <0.023 -- SB-9 (40.0) 02/09/10 + 40.0 0.12 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00080 <0.001 <0.025 -- SB-10
SB-10 (2.5) 02/04/10 + 2.5 <0.049 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.0030 <0.001 <0.022 -- SB-10 (5.0) 02/04/10 + 5.0 <0.046 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 <0.00074 <0.001 <0.021 -- SB-10 (7.5) 02/04/10 + 7.5 <0.048 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 <0.00075 <0.001 <0.022 -- SB-10 (10.0) 02/09/10 + 10.0 0.13 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.011 <0.001 <0.022 -- SB-10 (12.5) 02/09/10 + 12.5 0.086 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 0.0069 <0.001 <0.022 -- SB-10 (15.0) 02/09/10 + 15.0 2.7 0.001 <0.001 <0.001 0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.016 <0.001 <0.024 -- SB-10 (17.5) 02/09/10 + 17.5 0.093 <0.0006 <0.001 <0.001 0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00082 <0.001 <0.026 -- SB-10 (20.0) 02/09/10 + 20.0 1.2 <0.0006 <0.001 <0.001 0.016 -- <0.001 -- <0.001 <0.11 <0.0006 0.0033 <0.001 <0.023 -- SB-10 (22.5) 02/09/10 + 22.5 <0.056 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00026 <0.001 <0.026 -- SB-10 (25.0) 02/09/10 + 25.0 <0.056 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00081 <0.001 <0.026 -- SB-10 (27.5) 02/09/10 + 27.5 <0.052 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00078 <0.001 <0.024 -- SB-10 (30.0) 02/09/10 + 30.0 <0.057 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 <0.00082 <0.001 <0.026 -- SB-10 (32.5) 02/09/10 + 32.5 0.16 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00081 <0.001 <0.023 -- SB-10 (35.0) 02/09/10 + 35.0 0.086 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 <0.00083 <0.001 <0.026 -- SB-10 (37.5) 02/09/10 + 37.5 0.073 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 <0.00077 <0.001 <0.022 -- SB-10 (40.0) 02/09/10 + 40.0 1.5 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00082 <0.001 <0.024 -- SB-11
SB-11 (2.5) 02/04/10 + 2.5 <0.051 0.0008 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.0007 <0.00079 <0.001 <0.023 -- SB-11 (5.0) 02/04/10 + 5.0 <0.051 0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.001 <0.0078 <0.001 <0.023 -- SB-11 (7.5) 02/04/10 + 7.5 0.17 0.003 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.002 <0.0080 <0.001 <0.023 -- SB-11 (10.0) 02/10/10 + 10.0 0.9 0.003 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.003 0.0015 <0.001 <0.024 -- I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Tables\306441 TABLES.xlsx Page 3 of 10 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Toluene Ethylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 11,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
SB-11 (12.5) 02/10/10 + 12.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 0.0008 0.0064 <0.001 <0.025 -- SB-11 (15.0) 02/10/10 + 15.0 <0.051 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.003 <0.00076 <0.001 <0.023 -- SB-11 (17.5) 02/10/10 + 17.5 <0.054 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.002 <0.00079 <0.001 <0.024 -- SB-11 (20.0) 02/10/10 + 20.0 <0.058 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 0.002 <0.00087 <0.001 <0.026 -- SB-11 (22.5) 02/10/10 + 22.5 0.13 0.002 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.005 <0.00080 <0.001 0.035 -- SB-11 (25.0) 02/10/10 + 25.0 0.18 0.002 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 0.008 0.0031 <0.001 0.036 -- SB-11 (27.5) 02/10/10 + 27.5 0.41 0.004 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.003 0.0016 <0.001 <0.024 -- SB-11 (30.0) 02/10/10 + 30.0 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0012 <0.001 <0.024 -- SB-11 (32.5) 02/10/10 + 32.5 1.2 0.01 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 0.001 0.00083 <0.001 <0.026 -- SB-11 (35.0) 02/10/10 + 35.0 0.88 0.019 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 0.003 0.00088 <0.001 <0.027 -- SB-11 (37.5) 02/10/10 + 37.5 1.6 0.042 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.14 0.004 <0.00090 <0.001 <0.028 -- SB-11 (40.0) 02/10/10 + 40.0 1.6 0.053 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 0.007 <0.00083 <0.001 <0.025 -- SB-12
SB-12 (2.5) 02/04/10 + 2.5 <0.051 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00077 <0.001 <0.023 -- SB-12 (5.0) 02/04/10 + 5.0 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 <0.00078 <0.001 <0.023 -- SB-12 (7.5) 02/04/10 + 7.5 <0.055 0.002 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0021 <0.001 <0.025 -- SB-12 (10.0) 02/09/10 + 10.0 0.57 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.031 <0.001 <0.023 -- SB-12 (15.0) 02/09/10 + 15.0 0.13 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.031 <0.001 <0.022 -- SB-12 (20.0) 02/09/10 + 20.0 0.18 0.001 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 0.016 <0.001 <0.026 -- SB-12 (22.5) 02/09/10 + 22.5 <0.059 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.14 <0.0007 <0.00088 <0.001 <0.027 -- SB-12 (25.0) 02/09/10 + 25.0 <0.058 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 0.0022 <0.001 <0.026 -- SB-12 (27.5) 02/09/10 + 27.5 <0.052 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0022 <0.001 <0.024 -- SB-12 (30.0) 02/09/10 + 30.0 <0.058 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 <0.00084 <0.001 <0.026 -- SB-12 (32.5) 02/09/10 + 32.5 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00081 <0.001 <0.026 -- SB-12 (35.0) 02/09/10 + 35.0 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00081 <0.001 <0.024 -- SB-12 (37.5) 02/09/10 + 37.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00078 <0.001 <0.025 -- SB-12 (40.0) 02/09/10 + 40.0 0.13 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.0018 <0.001 <0.022 -- SB-13
SB-13 (2.5) 02/03/10 + 2.5 <0.048 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 0.0013 <0.001 <0.022 -- SB-13 (5.0) 02/03/10 + 5.0 <0.054 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0040 <0.001 <0.024 -- SB-13 (7.5) 02/03/10 + 7.5 <0.049 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.0015 <0.001 <0.022 -- SB-13 (10.0) 02/10/10 + 10.0 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 0.0023 <0.001 <0.026 -- SB-13 (12.5) 02/10/10 + 12.5 <0.051 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0014 <0.001 <0.023 -- SB-13 (15.0) 02/10/10 + 15.0 <0.056 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00083 <0.001 <0.025 -- SB-13 (17.5) 02/10/10 + 17.5 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00080 <0.001 <0.026 -- SB-13 (20.0) 02/10/10 + 20.0 <0.060 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.14 <0.0007 0.0011 <0.001 <0.027 -- SB-13 (22.5) 02/10/10 + 22.5 <0.052 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00080 <0.001 <0.024 -- SB-13 (25.0) 02/10/10 + 25.0 <0.052 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00080 <0.001 <0.024 -- SB-13 (27.5) 02/10/10 + 27.5 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00080 <0.001 <0.024 -- SB-13 (30.0) 02/10/10 + 30.0 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 <0.00084 <0.001 <0.023 -- SB-13 (32.5) 02/10/10 + 32.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00083 <0.001 <0.025 -- SB-13 (35.0) 02/10/10 + 35.0 <0.054 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00079 <0.001 <0.024 -- I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Tables\306441 TABLES.xlsx Page 4 of 10 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Toluene Ethylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 11,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
SB-13 (37.5) 02/10/10 + 37.5 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00079 <0.001 <0.024 -- SB-13 (40.0) 02/10/10 + 40.0 <0.051 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00083 <0.001 <0.023 -- Monitoring Wells
MW-1
MW1 (5) 01/20/93 5.0 2.2 0.0082 0.011 0.0056 0.057 -- -- -- -- -- -- -- -- -- -- MW1 (9.5) 01/20/93 9.5 82 0.43 0.18 2.6 4.4 -- -- -- -- -- -- -- -- -- -- MW1 (12.5) 01/20/93 12.5 890 3.1 3.7 12 38 -- -- -- -- -- -- -- -- -- -- MW1 (15) 01/20/93 15.0 32 1.7 0.14 1.3 1.3 -- -- -- -- -- -- -- -- -- -- MW1 (17.5) 01/20/93 17.5 1,200 12 38 22 130 -- -- -- -- -- -- -- -- -- -- MW1 (20) 01/20/93 20.0 270 4.6 14 5.1 33 -- -- -- -- -- -- -- -- -- -- MW1 (22.5) 01/20/93 22.5 610 7.1 26 11 73 -- -- -- -- -- -- -- -- -- -- MW1 (25) 01/20/93 25.0 12,000 160 540 190 1,200 -- -- -- -- -- -- -- -- -- -- MW1 (30) 01/20/93 30.0 37 4.0 6.4 1.5 9.3 -- -- -- -- -- -- -- -- -- -- MW1 (35) 01/20/93 35.0 150 3.9 9.6 2.7 18 -- -- -- -- -- -- -- -- -- -- MW1 (40) 01/20/93 40.0 27 1.2 1.7 0.51 3.1 -- -- -- -- -- -- -- -- -- -- MW1 (45) 01/20/93 45.0 1.4 0.36 0.080 0.024 0.089 -- -- -- -- -- -- -- -- -- -- MW1 (50) 01/20/93 50.0 <1.0 0.028 0.052 0.016 0.095 -- -- -- -- -- -- -- -- -- -- MW1 (55) 01/20/93 55.0 <1.0 <0.005 0.0083 <0.005 0.0079 -- -- -- -- -- -- -- -- -- -- MW1 (60) 01/20/93 60.0 <1.0 0.0072 0.014 <0.005 0.022 -- -- -- -- -- -- -- -- -- -- MW1 (64.5) 01/20/93 64.5 <1.0 0.0077 0.014 <0.005 0.019 -- -- -- -- -- -- -- -- -- -- MW-1R
MW-1R (2.5) 02/03/10 + 2.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00088 <0.001 <0.025 -- MW-1R (5.0) 02/03/10 + 5.0 <0.048 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 0.0084 <0.001 <0.022 -- MW-1R (7.5) 02/03/10 + 7.5 <0.053 0.0008 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.0054 <0.001 <0.024 -- MW-1R (10.0) 02/08/10 + 10.0 0.93 0.023 0.005 0.001 0.003 -- <0.001 -- <0.001 <0.14 0.0008 0.017 <0.001 <0.028 -- MW-1R (12.5) 02/08/10 + 12.5 17 0.021 0.004 0.003 0.004 -- <0.001 -- <0.001 <0.12 0.002 0.30 <0.001 <0.025 -- MW-1R (15.0) 02/08/10 + 15.0 11 0.056 0.007 0.005 0.008 -- <0.001 -- <0.001 <0.13 0.002 0.11 <0.001 <0.025 -- MW-1R (17.5) 02/08/10 + 17.5 88 0.13 <0.062 0.069 0.11 -- <0.062 -- <0.062 <6.2 <0.031 0.021 <0.062 <1.2 -- MW-1R (20.0) 02/08/10 + 20.0 24 0.73 0.027 0.087 0.073 -- <0.001 -- <0.001 <0.13 0.011 0.27 <0.001 <0.026 -- MW-1R (22.5) 02/08/10 + 22.5 4.6 0.071 0.006 0.007 0.013 -- <0.001 -- <0.001 <0.12 0.009 0.076 <0.001 <0.024 -- MW-1R (25.0) 02/08/10 + 25.0 2.1 0.10 0.011 0.010 0.016 -- <0.001 -- <0.001 <0.13 0.027 0.044 <0.001 <0.026 -- MW-1R (27.5) 02/08/10 + 27.5 2,100 2.0 0.22 8.0 4.4 -- <0.070 -- <0.070 <7.0 0.094 12 <0.070 <1.4 -- MW-1R (30.0) 02/08/10 + 30.0 92 0.10 <0.068 0.40 0.65 -- <0.068 -- <0.068 <6.8 <0.034 2.2 <0.068 <1.4 -- MW-1R (32.5) 02/08/10 + 32.5 600 1.1 0.57 5.7 24 -- <0.062 -- <0.062 <6.2 0.14 13 <0.062 <1.2 -- MW-1R (35.0) 02/08/10 + 35.0 160 0.12 0.42 0.88 7.0 -- <0.062 -- <0.062 <6.2 0.099 13 <0.062 <1.2 -- MW-1R (37.5) 02/08/10 + 37.5 1.5 0.029 0.015 0.008 0.035 -- <0.001 -- <0.001 <0.11 0.046 0.039 <0.001 0.031 -- MW-1R (40.0) 02/08/10 + 40.0 0.58 0.017 0.009 0.003 0.009 -- <0.001 -- <0.001 <0.12 0.011 0.023 <0.001 <0.024 -- MW-2
MW2 (5) 01/21/93 5.0 530 2.8 2.9 18 90 -- -- -- -- -- -- -- -- -- -- MW2 (10) 01/21/93 10.0 1.7 0.083 0.17 0.048 0.26 -- -- -- -- -- -- -- -- -- -- MW2 (12.5) 01/21/93 12.5 4,300 21 150 110 540 -- -- -- -- -- -- -- -- -- -- I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Tables\306441 TABLES.xlsx Page 5 of 10 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Toluene Ethylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 11,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
MW2 (15) 01/21/93 15.0 53 0.36 1.2 0.63 3.9 -- -- -- -- -- -- -- -- -- -- MW2 (19.5) 01/21/93 19.5 19 0.71 1.5 0.39 2.1 -- -- -- -- -- -- -- -- -- -- MW2 (25) 01/21/93 25.0 21 1.2 0.16 0.76 4.7 -- -- -- -- -- -- -- -- -- -- MW2 (28) 01/21/93 28.0 11 0.87 0.10 0.29 1.5 -- -- -- -- -- -- -- -- -- -- MW2 (30) 01/21/93 30.0 270 3.1 10 9.5 48 -- -- -- -- -- -- -- -- -- -- MW2 (35) 01/21/93 35.0 110 2.3 4.3 3.0 17 -- -- -- -- -- -- -- -- -- -- MW2 (40) 01/21/93 40.0 28 1.0 1.2 0.72 3.2 -- -- -- -- -- -- -- -- -- -- MW2 (45) 01/21/93 45.0 7.5 1.1 0.25 0.18 0.60 -- -- -- -- -- -- -- -- -- -- MW2 (47.5) 01/21/93 47.5 2.8 0.32 0.14 0.080 0.35 -- -- -- -- -- -- -- -- -- -- MW2 (50) 01/21/93 50.0 <1.0 0.043 0.016 0.0087 0.040 -- -- -- -- -- -- -- -- -- -- MW2 (52.5) 01/21/93 52.5 2.4 0.30 0.14 0.083 0.39 -- -- -- -- -- -- -- -- -- -- MW2 (55) 01/21/93 55.0 1.0 0.081 0.090 0.035 0.16 -- -- -- -- -- -- -- -- -- -- MW2 (58) 01/21/93 58.0 <1.0 0.012 0.0083 <0.005 0.010 -- -- -- -- -- -- -- -- -- -- MW-3
MW3 (5) 01/22/93 5.0 3,500 14 18 45 220 -- -- -- -- -- -- -- -- -- -- MW3 (10) 01/22/93 10.0 1,500 6.2 13 19 120 -- -- -- -- -- -- -- -- -- -- MW3 (13) 01/22/93 13.0 1.5 0.033 0.0066 0.027 0.088 -- -- -- -- -- -- -- -- -- -- MW3 (15) 01/22/93 15.0 9.6 0.093 0.020 0.11 0.34 -- -- -- -- -- -- -- -- -- -- MW3 (20) 01/22/93 20.0 120,000 480 1,000 1,300 8,800 -- -- -- -- -- -- -- -- -- -- MW3 (25) 01/22/93 25.0 10 0.56 0.23 0.18 1.2 -- -- -- -- -- -- -- -- -- -- MW3 (27.5) 01/22/93 27.5 11 0.68 0.51 0.20 1.4 -- -- -- -- -- -- -- -- -- -- MW3 (30) 01/22/93 30.0 11 0.62 0.46 0.16 1.0 -- -- -- -- -- -- -- -- -- -- MW3 (35) 01/22/93 35.0 2.3 0.13 0.090 0.036 0.24 -- -- -- -- -- -- -- -- -- -- MW3 (40) 01/22/93 40.0 1.5 0.20 0.067 0.014 0.072 -- -- -- -- -- -- -- -- -- -- MW3 (44.5) 01/22/93 44.5 <1.0 0.032 0.0056 <0.005 0.0096 -- -- -- -- -- -- -- -- -- -- MW3 (47.5) 01/22/93 47.5 <1.0 0.41 <0.005 <0.005 0.019 -- -- -- -- -- -- -- -- -- -- MW3 (50) 01/22/93 50.0 <1.0 0.34 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW-3R
MW-3R (2.5) 02/03/10 + 2.5 25 <0.031 <0.062 0.30 0.86 -- <0.062 -- <0.062 <6.2 <0.031 0.058 <0.062 <1.2 -- MW-3R (5.0) 02/03/10 + 5.0 14 <0.031 <0.063 0.17 0.56 -- <0.063 -- <0.063 <6.3 <0.031 0.12 <0.063 <1.3 -- MW-3R (7.5) 02/03/10 + 7.5 19 <0.032 <0.063 <0.063 0.14 -- <0.063 -- <0.063 <6.3 <0.032 0.023 <0.063 <1.3 -- MW-3R (10.0) 02/08/10 + 10.0 72 <0.029 <0.059 0.15 0.50 -- <0.059 -- <0.059 <5.9 <0.029 0.060 <0.059 <1.2 -- MW-3R (12.5) 02/08/10 + 12.5 49 <0.030 <0.061 <0.061 <0.061 -- <0.061 -- <0.061 <6.1 <0.030 2.6 <0.061 <1.2 -- MW-3R (15.0) 02/08/10 + 15.0 3.4 0.005 0.003 0.007 0.030 -- <0.001 -- <0.001 <0.11 0.001 0.23 <0.001 <0.021 -- MW-3R (17.5) 02/08/10 + 17.5 5,100 <0.11 <0.22 17 81 -- <0.22 -- <0.22 <22 <0.11 0.56 <0.22 <4.3 -- MW-3R (20.0) 02/08/10 + 20.0 7,300 0.81 <0.67 19 37 -- <0.67 -- <0.67 <67 <0.34 13 <0.67 <13 -- MW-3R (22.5) 02/08/10 + 22.5 61 <0.029 <0.057 0.11 0.33 -- <0.057 -- <0.057 <5.7 <0.029 0.27 <0.057 <1.1 -- MW-3R (25.0) 02/08/10 + 25.0 11 0.005 0.001 0.008 0.054 -- <0.001 -- <0.001 <0.12 0.006 0.041 <0.001 <0.024 -- MW-3R (27.5) 02/08/10 + 27.5 19 0.14 0.006 0.052 0.26 -- <0.001 -- <0.001 <0.13 0.022 0.076 <0.001 <0.026 -- MW-3R (30.0) 02/08/10 + 30.0 0.66 0.004 <0.001 0.002 0.004 -- <0.001 -- <0.001 <0.12 0.008 0.0066 <0.001 <0.024 -- MW-3R (32.5) 02/08/10 + 32.5 0.074 0.003 <0.001 0.001 0.002 -- <0.001 -- <0.001 <0.13 0.013 0.003 <0.001 <0.026 -- MW-3R (35.0) 02/08/10 + 35.0 0.074 0.002 <0.001 <0.001 0.001 -- <0.001 -- <0.001 <0.12 0.015 <0.00082 <0.001 <0.023 -- I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Tables\306441 TABLES.xlsx Page 6 of 10 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Toluene Ethylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 11,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
MW-3R (37.5) 02/08/10 + 37.5 2.3 0.008 <0.001 0.005 0.011 -- <0.001 -- <0.001 <0.13 0.018 0.041 <0.001 <0.025 -- MW-3R (40.0) 02/08/10 + 40.0 14 0.011 0.002 0.037 0.18 -- <0.001 -- <0.001 <0.11 0.017 0.31 <0.001 <0.021 -- MW-5
MW5 (5) 05/10/94 5.0 1.3 0.021 0.0072 <0.005 0.012 -- -- -- -- -- -- -- -- -- -- MW5 (10) 05/10/94 10.0 5.3 0.15 0.0096 <0.005 0.014 -- -- -- -- -- -- -- -- -- -- MW5 (15) 05/10/94 15.0 <1.0 0.013 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (19.5) 05/10/94 19.5 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (25) 05/10/94 25.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (29.5) 05/10/94 29.5 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (35) 05/11/94 35.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (40) 05/11/94 40.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (45) 05/11/94 45.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW5 (49) 05/11/94 49.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW-6
MW6 (7) 05/10/94 7.0 2.0 b <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW6 (10) 05/10/94 10.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW6 (15) 05/10/94 15.0 <1.0 0.014 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW6 (20) 05/10/94 20.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW6 (25) 05/10/94 25.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW6 (30) 05/10/94 30.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW6 (35) 05/10/94 35.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW6 (40) 05/10/94 40.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW6 (45) 05/10/94 45.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW6 (49) 05/10/94 49.0 <1.0 <0.005 <0.005 <0.005 <0.005 -- -- -- -- -- -- -- -- -- -- MW-7
MW-7 15.5' 06/06/06 15.5 <0.93 <0.0046 <0.0046 <0.0046 <0.0093 -- <0.0046 -- <0.0046 <0.93 <0.0046 -- <0.0046 <0.093 -- MW-7 25.5' 06/06/06 25.5 <0.98 <0.0049 <0.0049 <0.0049 <0.0098 -- <0.0049 -- <0.0049 <0.98 <0.0049 -- <0.0049 <0.098 -- MW-7 35' 06/06/06 35.0 <0.96 <0.0048 <0.0048 <0.0048 <0.0096 -- <0.0048 -- <0.0048 <0.96 <0.0048 -- <0.0048 <0.096 -- MW-8
MW-8-S-N-3 10/06/11 g 3.0 <0.046 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 <0.001 <0.001 <0.021 -- MW-8-S-N-6 10/06/11 g 6.0 <0.043 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.098 <0.0005 <0.001 <0.001 <0.020 -- MW-8-S-N-10 10/06/11 g 10.0 1.6 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 0.003 <0.001 <0.021 -- MW-8-S-N-13 10/06/11 e 13.0 0.24 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 <0.001 <0.001 <0.020 -- MW-8-S-N-15 10/06/11 15.0 0.086 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 <0.001 <0.001 <0.021 -- MW-8-S-N-18 10/06/11 f 18.0 0.70 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.098 <0.0005 <0.001 <0.001 <0.020 -- MW-8-S-N-20 10/06/11 20.0 0.34 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.098 <0.0005 <0.001 <0.001 <0.020 -- MW-8-S-N-22 10/06/11 22.0 <0.044 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 <0.001 <0.001 <0.020 -- MW-8-S-N-25 10/06/11 25.0 <0.043 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.099 <0.0005 <0.001 <0.001 <0.020 -- MW-10
MW-10-S-2.5 10/15/12 + 2.5 <0.042 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.095 <0.005 <0.001 <0.001 <0.019 -- MW-10-S-5 10/15/12 + 5.0 <0.046 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- MW-10-S-7.5 10/15/12 + 7.5 <0.046 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Tables\306441 TABLES.xlsx Page 7 of 10 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Toluene Ethylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 11,2-DCA 2
(mg/kg)
TABLE 1

HISTORICAL SOIL ANALYTICAL DATA
Chevron 306441 (Former Unocal Station No. 6980)
190-192 El Camino Real
South San Francisco, California
Sample
Sampled
Date
(mg/kg)
TBA 2
(mg/kg) (mg/kg) (mg/kg)
Ethanol 2 Benzene
(mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) (mg/kg) EDB 2
MW-10-S-12.5 10/25/12 12.5 <0.044 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.099 <0.005 <0.001 <0.001 <0.020 -- MW-10-S-15 10/25/12 15.0 0.10 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.11 <0.005 <0.001 <0.001 <0.022 -- MW-10-S-17.5 10/25/12 17.5 0.21 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- MW-10-S-20 10/25/12 20.0 0.11 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.096 <0.005 <0.001 <0.001 <0.019 -- MW-10-S-22.5 10/25/12 22.5 <0.043 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.099 <0.005 <0.001 <0.001 <0.020 -- MW-10-S-25 10/25/12 25.0 <0.045 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- MW-10-S-27.5 10/25/12 27.5 <0.042 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.097 <0.005 <0.001 <0.001 <0.019 -- MW-10-S-30 10/25/12 30.0 0.76 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.11 <0.005 <0.001 <0.001 <0.021 -- MW-10-S-32.5 10/25/12 32.5 0.40 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.097 <0.005 <0.001 <0.001 <0.019 -- MW-10-S-35 10/25/12 35.0 0.88 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.11 <0.005 <0.001 <0.001 <0.022 -- MW-10-S-37.5 10/25/12 37.5 0.18 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- MW-10-S-40 10/25/12 40.0 <0.046 <0.0005 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.10 <0.005 <0.001 <0.001 <0.021 -- Soil Vapor Wells
SV-2
SV-2 (2.5) 02/02/10 + 2.5 1.0 0.0009 <0.001 0.023 0.012 -- <0.001 -- <0.001 <0.12 <0.0006 0.069 <0.001 <0.024 -- SV-2 (5.0) 02/02/10 + 5.0 2.0 0.001 <0.001 0.053 0.007 -- <0.001 -- <0.001 <0.11 <0.0005 0.074 <0.001 <0.021 -- SV-2 (7.5) 02/02/10 + 7.5 37 0.058 <0.057 0.79 0.13 -- <0.057 -- <0.057 <5.7 <0.029 0.11 <0.057 <1.1 -- SV-2 (10.0) 02/02/10 + 10.0 4,200 2.6 <0.58 65 28 -- <0.058 -- <0.58 <58 <0.29 2.5 <0.58 <1.2 -- SV-3
SV-3 (2.5) 02/02/10 + 2.5 1,700 <0.030 <0.060 6.0 41 -- <0.060 -- <0.060 <6.0 <0.030 1.6 <0.061 <1.2 -- SV-3 (5.0) 02/02/10 + 5.0 <0.046 <0.005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.10 <0.0005 0.003 <0.001 <0.021 -- SV-3 (7.5) 02/02/10 + 7.5 50 <0.027 <0.054 0.15 0.90 -- <0.054 -- <0.054 <5.4 <0.027 0.20 <0.054 <1.1 -- SV-4
SV-4 (2.5) 02/02/10 + 2.5 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00078 <0.001 <0.025 -- SV-4 (5.0) 02/02/10 + 5.0 <0.055 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 0.00091 <0.001 <0.025 -- SV-4 (7.5) 02/02/10 + 7.5 34 <0.029 <0.058 <0.058 0.081 -- <0.058 -- <0.058 <5.8 <0.029 0.0076 <0.058 <1.2 -- SV-5
SV-5 (2.5) 02/01/10 + 2.5 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.0079 <0.001 <0.024 -- SV-5 (5.0) 02/01/10 + 5.0 <0.052 0.002 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 0.011 <0.001 <0.023 -- SV-5 (7.5) 02/01/10 + 7.5 0.11 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 0.048 <0.001 <0.025 -- SV-5 (10.0) 02/01/10 + 10.0 0.44 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 <0.0078 <0.001 <0.023 -- SV-6
SV-6 (2.5) 02/01/10 + 2.5 <0.060 0.0020 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.14 <0.0007 <0.00090 <0.001 <0.027 -- SV-6 (5.0) 02/01/10 + 5.0 <0.058 <0.0007 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0007 <0.00087 <0.001 <0.026 -- SV-6 (7.5) 02/01/10 + 7.5 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.0013 <0.001 <0.023 -- SV-6 (10.0) 02/01/10 + 10.0 <0.053 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.12 <0.0006 <0.00083 <0.001 <0.024 -- SV-7
SV-7 (2.5) 02/01/10 + 2.5 <0.050 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0006 0.0011 <0.001 <0.023 -- SV-7 (5.0) 02/01/10 + 5.0 <0.048 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 <0.0080 <0.001 <0.022 -- SV-7 (7.5) 02/01/10 + 7.5 <0.057 <0.0006 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.13 <0.0006 <0.00080 <0.001 <0.026 -- SV-7 (10.0) 02/01/10 + 10.0 <0.048 <0.0005 <0.001 <0.001 <0.001 -- <0.001 -- <0.001 <0.11 <0.0005 <0.0080 <0.001 <0.022 -- I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Tables\306441 TABLES.xlsx Page 8 of 10 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Toluene Ethylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 11,2-DCA 2
(mg/kg)
TABLE 1

I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Tables\306441 TABLES.xlsx Page 9 of 10 Sample
Name Lead 3
(feet, bgs) (mg/kg)
Depth Toluene Ethylbenzene
(mg/kg)
TPH-GRO 1
Organic
TAME 2 Xylenes MTBE 1 ETBE 2 DIPE 2
BTEX 1
Naphthalene 11,2-DCA 2
(mg/kg)
TABLE 1

I:\Chevron\05 Chevron Site Folders\306441 (Former Unocal #6980)\Tables\306441 TABLES.xlsx Page 10 of 10

APPENDIX A
San Mateo County Health System –
Groundwater Protection Program
Correspondence

APPENDIX C
Empirical Data Supporting Groundwater
Benzene Concentration Exclusion
Criteria for Petroleum Vapor Intrusions
Investigations dated June 2011
Empirical Data Supporting Groundwater Benzene Concentration Exclusion Criteria for Petroleum Vapor Intrusion Investigations Tom Peargin and Ravi Kolhatkar
Chevron Energy Technology Company
ABSTRACT: An empirical study establishing depth to groundwater and dissolved benzene concentrations which represent exclusion criteria guiding vapor intrusion (VI) investigation at petroleum hydrocarbon sites. Our conceptual model is based on numerous field and modeling studies that demonstrate rapid attenuation of petroleum hydrocarbon vapors in the presence of oxygen, especially where vapor flux is sufficiently low. A database of soil vapor samples and correlative groundwater samples was assembled consisting of 218 data pairs from 25 sites. A second database of benzene concentrations from 269 gasoline smear zone monitoring wells (83 sites) was assembled to characterize the lower limit of gasoline smear zone concentrations. These datasets suggest that when groundwater benzene concentrations are below limits indicative of the absence of gasoline LNAPL, benzene vapors are sourced at low concentrations and are transported only a short distance above the water table. Even where soil vapors were sourced from gasoline LNAPL smear zones, transport distances for benzene exceeding 300 µg/m3 were never greater than 15 ft. These data support benzene concentration exclusion criterion below which it may be unnecessary to perform VI investigations.

INTRODUCTION
This paper presents an empirical study establishing depth to groundwater and dissolved benzene concentration values which represent exclusion criteria guiding vapor intrusion (VI) investigation at petroleum hydrocarbon sites. Our conceptual model is based on numerous field and modeling studies that demonstrate rapid attenuation of petroleum hydrocarbon vapors in the presence of oxygen, especially where vapor source mass flux is sufficiently low. This study builds upon similar, previously published empirical data evaluations by McHugh et al (2010) and Davis (2005, 2006, and 2009).

We have screened our dataset to include only high quality soil vapor analytical results (without leaks in the sampling train and without elevated reporting levels due to interference), supported by a large groundwater analytical dataset used to characterize smear zone conditions. Our conclusions support those of the previously cited authors.

Conceptual Model - Petroleum Hydrocarbon Vapor Transport Distance as a Function of Source Strength
Many bench-scale experiments, field investigations, and models have shown that petroleum hydrocarbon aerobic biodegradation rates (mass consumed/time) in vadose zone soils are much faster than diffusive transport rates (distance/time) (Abreu & Johnson, 2006; DeVaull, 2007). Where source mass flux is high and oxygen diffusion from the surface is unimpeded, a distinct aerobic/anaerobic interface develops in the vadose zone, where soil gas below the interface contains very little oxygen and biodegradable petroleum hydrocarbons are transported at similar rates as recalcitrant chlorinated hydrocarbons. Soil gas above the interface contains significant oxygen and very little petroleum hydrocarbon vapor. The aerobic/anaerobic interface represents a reaction zone where soil microbial populations rapidly consume upward diffusing petroleum hydrocarbon vapor in the presence of oxygen diffusing downward from the surface. Given site stratigraphic and physical conditions where oxygen diffusion is unimpeded, the vertical distance between the source and the aerobic/anaerobic interface is largely a function of the source mass flux, with higher vapor flux resulting in greater separation between the source and the aerobic/anaerobic interface.

Within the context of this conceptual model, we believe it is possible to characterize the type of mass transfer mechanisms contributing to vapor flux as a function of dissolved petroleum hydrocarbon concentrations present in groundwater. We postulate that a statistically derived benzene concentration limit can characterize sources where both partitioning from dissolved phase and volatilization from LNAPL is occurring (smear zone), versus sources where only partitioning from dissolved phase is occurring (dissolved plume). This study seeks to demonstrate that a dissolved benzene concentration screening value can be derived which identifies dissolved plume sources where vadose zone petroleum hydrocarbon diffusive transport will be limited due to low vapor flux. Exclusion criteria can identify sites where petroleum hydrocarbon vapor intrusion investigation is not warranted. Such sites have simple and well characterized hydrogeology (e.g., no stratigraphic or physical barriers limiting oxygen diffusive transport from the surface, and no vadose zone soil sources beneath buildings), sufficient separation distance from groundwater to building foundations, and a low strength dissolved plume source.

COMPILATION OF SOIL VAPOR CONCENTRATION AND GROUNDWATER

CONCENTRATION DATA
Our study follows methodology of Davis (2009) by plotting transport distance of petroleum hydrocarbon vapors sourced from the saturated zone as a function of dissolved concentration. We have focused on benzene vapors because this is the primary petroleum hydrocarbon contaminant of concern. Soil vapor sample analyses were selected based on the following site conditions and data quality criteria. • Absence of petroleum-impacted vadose zone soil – This was evaluated on the basis of historical site records to identify soil vapor probe locations that may have been installed within the footprint of former underground storage tanks, piping or site excavations, and by reviewing the soil boring logs for the soil vapor points or nearby monitoring wells/ borings for the absence of elevated soil PID/FID values at various depths.
• Appropriate sampling and analytical protocols – Only data collected according to Chevron’s internal guidance document on soil vapor sampling with documented use of following procedures was used in this analysis. This ensured that the resulting soil vapor data met rigorous quality control/quality assurance (QA/QC) considerations.
o probe installation (properly constructed permanent soil vapor probes installed with hollow stem auger or direct push rigs)
o sampling equipment and procedure (use of 100% lab certified Summa® canisters together with Nylon or Teflon tubing and sampling flow-rates set < 200 mL/min)
o leak detection method (use of helium, 1,1-difluoroethane or isopropanol as a tracer compound)
o laboratory analytical method (EPA method TO-15 or 8260B for soil vapor analysis with benzene reporting limit for lower concentration samples < 10 µg/m3)
• Presence of nearby monitoring wells - In order to correlate soil vapor concentration data with dissolved benzene concentrations, only those wells within 30 ft of the soil vapor probe location were used. In addition, only groundwater data collected within the quarter in which soil vapor sampling occurred was used.

Groundwater concentration and elevation contour maps were reviewed to ensure that the resulting soil vapor and groundwater data pairs were truly representative of the conceptual site model for vapor intrusion (vapors sourced from the saturated zone).

Soil Vapor Concentration and Groundwater Concentration Data Analysis Based on the above screening process, we identified 82 soil vapor sampling points from 25 sites (20 in California and one site each in Oregon, Washington, Utah, Colorado and Michigan) with 218 pairs of benzene soil vapor and groundwater concentration data.

Figure 1 shows groupings of soil vapor sample concentration ranges plotted as a function of the separation distance between source and soil vapor probe (depth to groundwater – depth to soil vapor sampling probe) and the corresponding groundwater benzene concentration. Soil vapor benzene concentrations measured at each of these locations are represented in four ranges; < 30 µg/m3, 30 to 300 µg/m3, 300 to 3,000 µg/m3 , 3,000 µg/m3 to 30,000 µg/m3
, and > 30,000 µg/m3 These ranges approximate 10-6 through 10-2 excess cancer risk target deep soil gas concentrations (Question 4, EPA 2002). When measurable LNAPL was present in the nearest monitoring well at the time of soil vapor sampling, corresponding groundwater concentrations were arbitrarily set at a maximum 30,000 µg/L.

The following observations can be made:
• 70% of soil vapor samples contained benzene at concentrations less than 30 µg/m3 (152 of 218 samples) irrespective of corresponding groundwater concentrations.
• No soil vapor concentrations exceeding 300 µg/m3 benzene (10-5 excess cancer risk target deep soil gas concentration; EPA 2002) were observed at separation distances greater than 15 ft.
• Benzene soil vapor concentrations exceeding 300 µg/m3 were only observed above groundwater sources where benzene concentrations exceeded 1,000 µg/L.

These data support our conceptual model that soil vapor transport at concentrations exceeding target screening values can only occur where groundwater source concentrations are high, and that high source strength can be characterized as a function of dissolved hydrocarbon concentration (>1,000 µg/L benzene). Rapid attenuation of petroleum hydrocarbon vapor is commonplace, even where high strength sources are present. Where dissolved concentrations are low, vapor flux is also low, and vapor transport is limited
Figure 1. Separation distance between source (groundwater) and soil vapor sample depth as a function of groundwater benzene concentration.

Characterization of LNAPL Smear Zone Vapor Sources through Groundwater Concentration Data
In order to characterize the range of benzene concentrations within gasoline smear zones, a monitoring well analytical database was constructed from an initial dataset of 287 retail service station and terminal sites where past releases had resulted in the presence of LNAPL plumes. A sequential screening process was applied to select wells and time series data for inclusion in the database:
• Smear zone wells were identified through appearance of a separate LNAPL phase greater than 0.01 ft thickness in the well during at least one monitoring event.

Historical site records and groundwater maps were reviewed to verify that monitoring wells were located within the interpreted boundaries of the smear zone.
• Diesel or diesel gasoline mixed LNAPL plume wells were eliminated. • Wells from sites with atypical hydrogeologic characteristics were eliminated.

Such conditions include fractured rock aquifers, submerged smear zones, or 0 5
10 15
20 25
30 35
40 45

0.1 1 10 100 1000 10000 100000
Separation Distance (ft)
Groundwater Benzene (ug/L)
<30 ug/m3
30 - 300 ug/m3
300 - 3,000
ug/m3
3,000 - 30,000
ug/m3
> 30,000 ug/m3
15 ft between
groundwater
and soil vapor
1000 ug/L
benzene in
groundwater
variations in seasonal water table elevation that affected dissolved concentrations. Wells that were retained represent clastic sediment aquifers comprised of a wide variety of soil textures.
• Time series data collected during and after application of a remediation technology that affected smear zone LNAPL chemistry was removed from the dataset. For example, application of multiphase extraction or air sparging would eliminate use of data collected during and after the time these technologies were applied, whereas LNAPL skimming would not be expected to affect smear zone chemistry and data collected during this time frame were retained.

LNAPL Smear Zone Groundwater Concentration Data Analysis Benzene concentration versus time data from 269 wells (83 sites) were compiled in the final database. The distribution of time series means for benzene groundwater concentrations is shown in Figure 2.

Figure 2. Distribution of Time Series Mean Benzene Values for Smear Zone Wells Our evaluation utilizes a population of mean values derived from non-normally distributed time series data. This bears consideration when using these values to understand representative LNAPL chemistry. Since time series datasets often span 20 years or more, they are typically skewed toward lower concentrations in later time due to weathering of soluble and volatile components from LNAPL. A regression study of 23 LNAPL smear zone sites (Peargin 2001) indicated attenuation rate constants for high concentration smear zone wells are very low, due to slow weathering of central smear zone LNAPL producing a relatively constant range of dissolved concentrations throughout the time series. Low concentration smear zone wells are typically located near 1 10
100
1,000
10,000
100,000
1 1019283746
5564
738291
100109118127136145154163172181190199208217226235244253262 Mean Benzene Concentration (ug/L)
Time Series Datasets
the periphery, and show higher rates of weathering and variability in concentration data relative to central smear zone wells. Mean values of time series data from low concentration smear zone wells typically do not represent later time conditions, but are an appropriate screening value for exclusion criteria in the context of vapor intrusion, since the mean better represents concentration present prior to significant LNAPL weathering.

Following EPA statistical practices in evaluating the OSWER Vapor Intrusion Database (USEPA 2008), we selected the 5th percentile mean benzene value from the population of mean benzene concentration values as a lower limit of smear zone sources.

The 5th percentile concentration of 836 µg/L from the LNAPL smear zone groundwater concentration data analysis compares favorably with the 520 µg/L lower benzene concentration limit from our soil vapor concentration and groundwater concentration data analysis.

SUMMARY AND CONCLUSIONS
Our soil vapor concentration and groundwater concentration data analysis, and LNAPL smear zone groundwater concentration data analysis, support the conceptual model that exclusion criteria guiding vapor intrusion investigation at petroleum hydrocarbon sites can be determined as a function of source strength and separation distance from groundwater. Our conclusions are similar to previously published empirical data evaluations by McHugh et al (2010) and Davis (2005, 2006, and 2009).

Davis (2009) identified significant attenuation of vapor concentration within 5 ft. of transport through clean soil where groundwater source concentrations were less than 1,000 µg/L benzene. Our dataset shows no soil vapor concentrations exceeding the 10-6 to 10-5 risk range target deep soil gas screening values (30-300 µg/m3) where groundwater concentrations were below 1,000 µg/L benzene. Transport distances for soil vapors exceeding 300 µg/m3 were never greater than 15 ft., even from LNAPL smear zone sources. Therefore, the exclusion criteria indicated by our dataset supports the 3 m (10 ft.) vertical separation exclusion criteria for dissolved plume sources proposed by McHugh et al (2010), and the 5 ft. separation distance for a dissolved plume source proposed by Davis (2009), at a 10-6 to 10-5 risk range target deep soil gas screening concentration (EPA, 2002).

The following exclusion criteria for vapor intrusion investigations at petroleum hydrocarbon release sites are supported by our dataset:
• Groundwater is the sole source of petroleum hydrocarbon vapor transport to overlying buildings (no vadose zone vapor sources exist) • The site conceptual model has adequately characterized the range of conditions that could cause misalignment between source strength and vapor transport (fractured rock aquifers, large water table fluctuations) • No significant stratigraphic or man-made barriers limit oxygen diffusive transport to the vadose zone from the surface
• Benzene dissolved concentrations are lower than 1,000 µg/L (this study; Davis, 2009).
• Depth to groundwater for a dissolved plume source is greater than 5 ft. (Davis 2009), or 10 ft. (McHugh et al, 2010)
References
Abreu, L. D. V. and Johnson, P. C. 2006. “Simulating the Effect of Aerobic Biodegradation on Soil Vapor Intrusion into Buildings: Influence of Degradation Rate, Source Concentration, and Depth.” Environmental Science & Technology 40, 2304-2315.

Davis, R. 2005. “Making sense of subsurface vapor attenuation in petroleum hydrocarbon sources.” LUSTLine Bulletin, 49(March 2005), 10–14.

Davis, R. 2006. “Vapor attenuation in the subsurface from petroleum hydrocarbon sources.” LUSTLine Bulletin 52(May 2006), 22–25.

Davis, R. 2009. “Bioattenuation of petroleum hydrocarbons in the subsurface: update on recent studies and proposed screening criteria for the vapor intrusion pathway.” LUSTLine Bulletin 61 (May 2009), 11-14
DeVaull, G. E. 2007. “Indoor Vapor Intrusion with Oxygen-Limited Biodegradation for a Subsurface Gasoline Source.” Environmental Science & Technology 41, 3241- 3248.

Peargin, T. R., 2001. “Relative Depletion Rates of MTBE, Benzene, and Xylene from Smear Zone Non-Aqueous Phase Liquid.” The Sixth International In-Situ and OnSite Bioremediation Symposium. San Diego CA, June 4-7, 2001. Battelle Press.

Pgs. 67-74
Sanders, P.F., and Hers, I. 2006. “Vapor intrusion in homes over gasoline-contaminated ground water in Stafford, New Jersey.” Ground Water Monitoring & Remediation 26(1), 63–72.

McHugh, Thomas , Davis, Robin , Devaull, George , Hopkins, Harley , Menatti, John and Peargin, Tom. 2010. “Evaluation of Vapor Attenuation at Petroleum Hydrocarbon Sites: Considerations for Site Screening and Investigation.” Soil and Sediment Contamination: An International Journal 19: 6, 725 - 745 USEPA. 2002. Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils (Subsurface Vapor Intrusion Guidance), United States Environmental Protection Agency, Washington, D.C.

USEPA. 2008. U.S. EPA’s Vapor Intrusion Database: Preliminary Evaluation of Attenuation Factors, United States Environmental Protection Agency, Washington, D.C.

EXECUTION COPY SEPTEMBER 8, 2017
- 17 -
00818.4400818.4
EXHIBIT "D"

FIXED PRICE PROPOSAL FOR RAP IMPLEMENTATION
[attached]

Environmental Consultants 7041 Koll Center Parkway 925 426-0080 and Contractors Suite 135 FAX 925 426-0707
Pleasanton, CA 94566 www.scsengineers.com
RevisedRAPProposalv.F
August 25, 2017
Proposal Number: 010356214 (rev)
Shamaim Incorporated
c/o Mr. Roberto Davidsohn
848 North Rainbow Boulevard, Suite 2885
Las Vegas, Nevada 89107
Subject: Revised Fixed Price Proposal for RAP Implementation 190-192 El Camino Real, South San Francisco, California Dear Mr. Davidsohn:

SCS Engineers (SCS) has prepared this Revised Fixed Price Proposal (Proposal) to Shamaim, Inc. (the “Owner”) to implement the Revised Remedial Action Plan (RAP) dated July 8, 2014 for the property located at 190-192 El Camino Real in South San Francisco, California (the Site), as approved by the San Mateo County Health Services Agency Groundwater Protection Program (County) on August 21, 2014. We have updated our prior Proposals to reflect current soils disposal and backfill pricing. The pricing presented in this Proposal is valid for 30 days from the initial Proposal (August 8, 2017). As requested, SCS intends this Revised Proposal to be a “turnkey” solution for Owner, meaning that, except for the costs of Supplemental Remediation Work as defined below, in exchange for a fixed fee, SCS will accept the risks and liabilities associated with implementation of the Remediation Work as defined below.

A. BACKGROUND
The Site is occupied by an inactive former service station building and surrounding paved parking area. We understand that the Owner plans to redevelop the Site, which was formerly occupied by a Unocal service station and is now commonly referred to as Chevron/EMC Facility 306441. The planned redevelopment is for commercial use as generally shown in Exhibit 1, to be provided by the Owner.

We understand that Chevron Environmental Management Company (EMC) is currently working under the oversight of the County to address contamination associated with releases from the former Unocal service station.

We have reviewed the available documents, including the documents available through the State Water Resources Control Board (SWRCB) GeoTracker website and recent correspondence with the County regarding the Site. We have also independently inspected the Site and discussed it at length with the Owner’s environmental consultant, Tom Graf.

Pursuant to an Environmental Agreement entered between Owner and EMC, EMC has Mr. Roberto Davidsohn
August 25 , 201 7

Page 2 ends

South San Francisco City CouncilSeptember 14, 2022

South San Francisco City Council
September 14, 2022