Agenda packet — Newark City Council, May 25, 2023 (part 8 of 10)

As discussed above and based on Ramboll investigations in 2015 and 2019, soil, soil gas and groundwater sampling do not show significant impacts from these prior operations.

Some detections of TPH-g, benzene and naphthalene were identified in soil gas above ESLs but were isolated in extent. In groundwater, only TPH-mo was detected in a grab groundwater sample above the ESL and VOCs were not detected above laboratory reporting limits in groundwater samples from this property. No additional investigation is proposed for 38288 Cedar. If the site is developed in the future, mitigation measures may need to be implemented to address soil gas concentrations which are above ESLs.

5.2 Former USTs at 38370 Cedar
Soil, soil gas, and groundwater sampling conducted by Ramboll in 2015 and 2019 confirmed that elevated concentrations of TPH-g, TPH-d, BTEX, naphthalene, 1,2,4-TMB, and possibly MTBE are present at concentrations above ESLs at well MW-1. Additional monitoring wells installed by Ramboll that are located up- and downgradient of the former UST locations did Packet Page 2108
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Nature and Extent of Potential Contamination 24 Ramboll not detect concentrations of these fuel-related constituents in groundwater above ESLs, confirming that the elevated concentrations of fuel-related constituents are localized in shallow groundwater at MW-1 and EW-1.

As discussed in Section 6, Ramboll conducted a 4-day groundwater extraction test at well EW-1 to assess remediation options for addressing the elevated concentrations of fuelrelated constituents that are localized in shallow groundwater at MW-1 and EW-1.

Additional recommendations related to this portion of the site are presented below in Section 6.

Soil gas samples collected in the vicinity of the former USTs at 38370 Cedar, reported concentrations of benzene, naphthalene, and TPH-g well above ESLs. It is likely that these soil gas concentrations will decrease when shallow groundwater impacts are addressed.

Soil gas concentrations were also above ESLs in the following areas:
• At SV14, located in the immediate vicinity of the shed housing the asphalt spreaders (and east of the former UST area), where significant fuel staining was observed on the asphalt-paved surface;
• At SV15, located in the immediate vicinity of the waste oil shed; and • At SV16, SV17, and SV50 located where historically drums and buckets that reportedly contained waste overcoat, tack oil, and miscellaneous unknown materials were stored.

It should be noted that at sampling locations that are in the maintenance garage, which is between the former UST area and the shed housing the asphalt spreaders, VOCs were not detected in soil gas above laboratory reporting limits, suggesting the UST area and eastern area are isolated from each other.

5.3 38424 Cedar
Currently and historically, the warehouse 38424 Cedar has been leased by various businesses for storage. Soil gas samples collected in 2015 from SV19 and SV20, located near the storage area for old car and machine parts, reported benzene concentrations of 170 and 6.1 µg/m3, respectively. While the concentration at SV19 is well above the ESL for residential land use of 3.2 µg/m3, surface air leakage was reported in the Summa canister, whereas the benzene concentration in SV20 was only slightly above the ESL. VOCs were not detected above the ESLs in the soil gas samples from the remainder of 38424 Cedar at SV21 and SV22. In March 2019, soil gas sample SV52 was collected from a semipermanent soil gas probe installed in the vicinity of prior sample locations SV19 and SV20.

The only analytes detected were acetone, chloroform, and toluene; all concentrations were below their respective ESLs. Based on the resampling results, no additional investigation or remediation is proposed at 38424 Cedar.

5.4 38456 Cedar
No VOC concentrations were above ESLs in the soil gas samples collected from 38456 Cedar. No additional investigation or remediation is proposed.

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Nature and Extent of Potential Contamination 25 Ramboll

5.5 38472, 38486, and 38592 Cedar
At these properties, the only VOC reported above ESLs in soil gas was benzene. However, it is common to find benzene at these concentrations in soil gas in the vicinity of parking areas or roads. No additional investigation or remediation is proposed.

5.6 38594 Cedar
In sampling performed in 2015, except for SV34, the concentrations of benzene in the other four soil gas samples from this property, although above the ESL, were consistent with concentrations in the vicinity of parking areas or roads. Furthermore, a grab groundwater sample collected at this property did not detect benzene.

In the summa canister sample from SV34 collected in 2015, benzene, 1,2-bromoethane, ethylbenzene, 1,1,2-trichloroethane, and 1,1,2,2-tetrachloroethane were also detected at concentrations above the ESLs. However, surface air leakage was reported in the Summa canister, (i.e., 1,1-DFA was detected at a concentration of 2700 µg/m3). As a result, soil gas was resampled in March 2019, following installation of a semi-permanent monitoring probe (SV53) in the immediate vicinity of prior sampling location SV34. In the sample collected from SV53, only PCE, 1,1,1-TCA, carbon disulfide, and toluene were detected, but at concentrations below their respective ESLs. A grab groundwater sample collected at location SB28, adjacent to SV34 and SV53, did not detect these VOCs.

However, concentrations of TPH-d and TPH-mo were detected in the grab groundwater sample from SB28 at concentrations slightly above the ESLs.

Historically, before construction of the building at 38594 Cedar in 1985, two trucking companies utilized this property for storage and routine maintenance of their semi-trailer trucks. It is possible the elevated TPH-d and TPH-mo in the grab groundwater sample could be related to leaks from vehicle storage in this region of the property. However, soil samples collected from the property did not detect VOC’s or petroleum-related COPCs.

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Groundwater Extraction Implementation 26 Ramboll

6. GROUNDWATER EXTRACTION IMPLEMENTATION
From March 11 to March 14, 2019, Ramboll conducted a 4-day groundwater extraction test at well EW-1. A temporary pump was installed near the bottom of the well (between 25 and 30 feet bgs) and groundwater was pumped into a temporary above ground storage tank stationed immediately east of EW-1. Pumping occurred daily and the pump was shut off and removed from the extraction well overnight to allow groundwater to equilibrate.

During pumping, Ramboll recorded pump flow rate, total volume of groundwater extracted, and monitored groundwater quality parameters including pH, temperature, dissolved oxygen, oxidation-reduction potential and conductivity. Ramboll also monitored volatile gas concentrations of the extracted groundwater by collecting water in a graduated container and creating a sealed lid on the container using aluminum foil. After a 5-minute period, Ramboll then penetrated the aluminum foil lid with a calibrated PID and recorded PID measurements in ppmv. PID measurements were recorded in an attempt to assess qualitative changes in groundwater TPH concentrations. Over the course of the groundwater extraction program, Ramboll also recorded drawdown in the adjacent monitoring well MW-1, as well as nearby monitoring wells MW-3 and MW-5. Water quality and PID readings, pump flow rate, and depth to water measurements are presented in Appendix C. Prior to starting groundwater extraction each morning, Ramboll collected baseline depth to water measurements at EW-1 and the nine monitoring wells (MW-1, MW-3 through MW-9) at the site. At the conclusion of the groundwater extraction program, a groundwater sample was collected from EW-1 directly from the pump discharge line, as discussed in Section 4.1.

The pump flow rates, approximate volume of groundwater extracted, and depth to water measurements of wells EW-1, MW-1, MW-3, and MW-5 during the 4-day groundwater extraction test at EW-1 are summarized below in Table 8.

Pumping flow rates during the extraction test increased in a step-wise manner on March 11 and 12, 2019. The approximate flow rates targeted were 2 gallons per minute (gpm), 2.75 gpm, 4 gpm, 5.5 gpm, and 7.5 gpm. Each flow rate was increased after depth to water drawdown stabilized in EW-1, with the exception of the 7.5 gpm flow rate because drawdown did not stabilize by the end of the day on March 12 through 14, 2019. At MW-1, located approximately 15 feet northeast of EW-1, drawdown was observed during all pump flow rates. At MW-3, located approximately 32 feet west-southwest of EW-1, and at MW-5, located approximately 57 feet south of EW-1, drawdown was not observed until the pump flow rate was increased to 5.5 gpm.

Groundwater extracted throughout the day on March 11, 2019 and until 14:35 on March 12, 2019, was noted to have a petroleum odor with PID readings generally ranging between 50 and 100 ppmv and depth to water measurements in EW-1 ranging between approximately 9 and 16 feet. Upon increasing the pump flow rate to 7.5 gpm on March 12, 2019 at 15:20, extracted groundwater was noted to have a petroleum odor and light grey color, with PID readings generally ranging between 100 and 700 ppmv and depth to water measurements in EW-1 steadily increasing to greater than 25 feet. The pump flow rate remained 7.5 gpm through the conclusion of the groundwater extraction test. PID readings on March 14, Packet Page 2111
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Groundwater Extraction Implementation 27 Ramboll
2019, generally ranged between 50 and 100 ppmv with extracted groundwater noted to have a petroleum odor and light grey color.

In total, approximately 8,200 gallons of groundwater were extracted from EW-1 during the groundwater extraction test. A grab sample was collected from the temporary storage tank that contained the extracted groundwater and analyzed for VOCs by USEPA method 8260B and TPH by USEPA method 8015. TPH-g and TPH-d concentrations in the grab sample were 2,200 µg/L and 480 µg/L, respectively. Concentrations of benzene (120 µg/L), 1,2- dichloroethane (1,2-DCA; 11 µg/L), MTBE (14 µg/L), n-propyl benzene (18 µg/L), 1,2,4-TMB (16 µg/L), 1,3,5-TMP (18 µg/L), and total xylenes (170 µg/L) were also detected in the grab sample. Assuming the concentrations of TPH-g in the grab sample were consistent throughout the storage tank, approximately 0.15 pounds of TPH-g were removed during the groundwater extraction test.

The approximately 8,200 gallons of groundwater that was extracted from EW-1 was profiled, off-hauled, and disposed off-site at Seaport Environmental’s facility in Redwood City.

6.1.1 Post-Extraction Groundwater Sampling Results
The results of groundwater sampling performed at MW-1 in September 2018, prior to the groundwater extraction program at EW-1, and in March 2019, after the groundwater extraction program at EW-1, are shown in Table 6. Although decreases in benzene and TPH-g were observed, concentrations of TPH-d and other VOCs remained relatively stable or increased slightly.

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Recommendations 28 Ramboll

7. RECOMMENDATIONS
Based on discussions with the ACWD, additional remediation and site characterization activities are recommended for select areas at the site as discussed below. For the remainder of the site, no additional site characterization/remediation activities are recommended other than annual monitoring of all groundwater monitoring wells.

7.1 38370 Cedar - Proposed Remediation Strategy
Ramboll proposes to implement the injection of an oxygen release compound to promote in situ aerobic bioremediation of petroleum hydrocarbons in groundwater and saturated soils within the footprint of the former UST area at 38370 Cedar. The injection program will be designed based on soil and groundwater sampling data collected to date and the results of a future groundwater monitoring event at the 38370 Cedar monitoring wells. A detailed workplan will be prepared for submittal to ACWD with regards to the injection program.

If the results of the injection program do not yield adequate reduction of site COPCs, Ramboll would design and implement a 3-month groundwater extraction program at EW-1 in an attempt to further reduce TPH and BTEX in groundwater at and in the immediate vicinity of the former USTs at 38370 Cedar. The groundwater extraction system would be designed to operate 24 hours per day and discharge treated groundwater to the sanitary or storm sewer depending on permitting requirements and capacity.

7.2 38370 Cedar – Additional Sampling
At the request of ACWD, a deep grab groundwater boring is recommendation for installation at 38370 Cedar to confirm that TPH and BTEX at the UST area of 38370 Cedar has not impacted the Newark Aquifer. The Newark Aquifer is comprised of interbedded sand and silt layers that typically occur between approximate depths of 50 to 70 feet bgs and is overlain by the Newark Aquitard. The deep grab groundwater boring will be installed outside of the former UST area at 38370 Cedar and located hydraulically downgradient between the closest ACWD groundwater supply well and the former UST area. The deep grab groundwater sample will be analyzed for BTEX and MTBE by USEPA method 8260B and TPH by USEPA method 8015. In addition, groundwater wells EW-1, MW-1, MW-3 through MW-7, and MW-10 should be resampled and analyzed for BTEX and MTBE by USEPA method 8260B and TPH by USEPA method 8015. A detailed workplan will be prepared for submittal to ACWD for the deep well installation and sampling activities.

The eastern area of 38370 Cedar contains elevated benzene and ethylbenzene in soil gas and appears to be isolated from the impacts associated with the former UST area at 38370 Cedar. Furthermore, the elevated benzene and ethylbenzene in soil gas do not appear to be the results of impacted groundwater. The eastern area, designated in green in Figure 4, was historically the storage location of drums and buckets that reportedly contained waste overcoat, tack oil, and miscellaneous unknown materials. At the request of ACWD, soil vapor wells SV48 through SV51 will be resampled and analyzed for VOCs, including naphthalene, by USEPA method 8260B for comparison to the results of the March 2019 sampling event. Since soil staining is also evident in this area, potentially contaminated soil in this area of the site will likely need to be addressed during the redevelopment of the site through the implementation of a Soil Management Plan.

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Recommendations 29 Ramboll

7.3 38288 Cedar - Low-Threat UST Case Closure
As discussed in Section 5.1, no further investigation is recommended at 38288 Cedar. At the request of ACWD, soil vapor well SV46 will be resampled and analyzed for VOCs, including naphthalene, by USEPA method 8260B for comparison to the results from the March 2019 sampling event. Lists of sensitive receptors and nearby groundwater supply wells will be compiled and mapped to support case closure under the RWQCB Low-Threat UST Case Closure Policy. The results of the receptor and monitoring well survey will be included in an updated report.

7.4 38594 Cedar – Monitoring Well Installation
TPH-d and TPH-mo were detected in the grab groundwater sample from SB28 at concentrations slightly above the ESLs. The ACWD has requested that additional groundwater sampling should be performed to better characterize groundwater in this area of the site. In response to their request, three groundwater monitoring wells are planned for installation at and in the vicinity of SB28, and sampled for TPH to confirm the TPH-d and TPH-mo concentrations. At the request of ACWD, soil vapor well SV53 will also be resampled and analyzed for VOCs, including naphthalene, by USEPA method 8260B to confirm results of the March 2019 sample. A detailed workplan will be prepared for submittal to ACWD for the well installation and sampling activities.

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References 30 Ramboll

8. REFERENCES
California Code of Regulations (CCR). Title 22, §64444.

Cal/EPA. 2011. Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (“Vapor Intrusion Guidance”). October.

Cioco, Ramon W. 2012. Hydrostratigraphy of the Shallow Aquifer in the Niles Cone Groundwater Basin. Master’s Thesis, San Jose State University.

Graymer, R.W. et al. 2006. Geologic Map of the San Francisco Bay Region.

Environ. 2015. Work Plan for Subsurface Investigation, 38288 – 38594 Cedar Boulevard, Newark, California. June 16.

Lawrence Berkeley National Laboratory (LBNL). 2002. Analysis of Background Distribution of Metals in the Soil at LBNL. June.

Ramboll Environ. 2018. Revised Work Plan for Additional Subsurface Investigation, 38288- 38594 Cedar Boulevard, Newark, California. December 19.

Regional Water Quality Control Board - San Francisco Bay Region (RWQCB). 2019.

Environmental Screening Levels. January.

United States Environmental Protection Agency (USEPA). 2019. Regional Screening Levels for Chemical Contaminants at Superfund Sites, RSL Summary Table (TR=1E-6, HQ=1). April.

Interviews
Frank Freitas. Site Co-owner. 2015. Personal interviews. May 19 and June 18.

Frank Freitas. Site Co-owner. 2015. Telephone interview. May 27.

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Ramboll
TABLES
Packet Page 2116
Table 1: Metals in Soil Samples
Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location
Sample
ID
Sample
Depth
(feet bgs)
Sample
Date Antimony Arsenic Barium Beryllium Cadmium Chromiumb Cobalt Copper Lead Mercury Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc 38288 Cedar Boulevard
SB01 SB01_2.5 2.5 7/7/2015 0.69 9.3 240 0.53 ND<0.25 95 14 35 10 ND<0.050 0.73 110 ND<0.50 ND<0.50 ND<0.50 58 67 SB02 SB02_2.5 2.5 7/7/2015 ND<0.50 6.4 160 ND<0.50 ND<0.25 66 13 28 8.6 ND<0.050 0.73 73 ND<0.50 ND<0.50 ND<0.50 43 52 SB03 SB03_2.5 2.5 7/7/2015 0.54 8.6 270 0.53 ND<0.25 83 14 29 9.9 ND<0.050 ND<0.50 95 ND<0.50 ND<0.50 ND<0.50 49 57 SB04 SB04_2.5 2.5 7/7/2015 ND<0.50 8.0 250 0.51 ND<0.25 76 13 29 9.2 ND<0.050 ND<0.50 91 ND<0.50 ND<0.50 ND<0.50 47 57 SB05 SB05_2.5 2.5 7/7/2015 0.61 8.1 210 0.51 ND<0.25 75 13 29 11 0.052 1.2 89 ND<0.50 ND<0.50 ND<0.50 48 59 SB06 SB06_2.5 2.5 7/7/2015 0.64 8.4 180 ND<0.50 ND<0.25 81 13 30 9.9 ND<0.050 0.52 99 ND<0.50 ND<0.50 ND<0.50 49 61 SB07 SB07_2.5 2.5 7/7/2015 0.67 8.7 300 ND<0.50 ND<0.25 80 13 31 9.6 ND<0.050 0.57 100 ND<0.50 ND<0.50 ND<0.50 47 62 SB08 SB08_2.5 2.5 7/7/2015 0.75 9.7 300 0.58 ND<0.25 90 15 38 11 ND<0.050 0.63 110 ND<0.50 ND<0.50 ND<0.50 54 73 SB09 SB09_2.5 2.5 7/7/2015 0.74 8.8 260 0.56 ND<0.25 90 15 37 11 ND<0.050 0.53 110 ND<0.50 ND<0.50 ND<0.50 53 67 SB10 SB10_2.5 2.5 7/7/2015 0.58 6.7 220 0.51 ND<0.25 74 13 27 7.8 ND<0.050 0.50 90 ND<0.50 ND<0.50 ND<0.50 44 53 38370 Cedar Boulevard
SB11 SB11_2.5 2.5 7/7/2015 0.56 8.3 200 0.53 ND<0.25 80 14 28 8.4 ND<0.050 ND<0.50 98 ND<0.50 ND<0.50 ND<0.50 48 51 SB12 SB12_2.5 2.5 7/7/2015 ND<0.50 5.6 120 ND<0.50 ND<0.25 59 11 30 16 0.11 0.61 72 ND<0.50 ND<0.50 ND<0.50 43 63 SB13 SB13_2.5 2.5 7/7/2015 ND<0.50 5.6 180 ND<0.50 ND<0.25 65 12 27 13 ND<0.050 ND<0.50 74 ND<0.50 ND<0.50 ND<0.50 42 61 SB14 SB14_2.5 2.5 7/7/2015 ND<0.50 5.4 110 ND<0.50 ND<0.25 64 16 40 6.0 ND<0.050 0.70 71 ND<0.50 ND<0.50 ND<0.50 78 56 SB15 SB15_2.5 2.5 7/7/2015 ND<0.50 6.8 170 ND<0.50 ND<0.25 71 14 33 8.2 ND<0.050 0.86 81 ND<0.50 ND<0.50 ND<0.50 62 57 SB16 SB16_2.5 2.5 7/7/2015 0.55 8.6 180 0.54 ND<0.25 83 14 32 9.1 ND<0.050 0.54 95 ND<0.50 ND<0.50 ND<0.50 55 58 SB17 SB17_2.5 2.5 7/7/2015 0.65 8.6 230 0.54 ND<0.25 82 14 32 10 ND<0.050 0.54 100 ND<0.50 ND<0.50 ND<0.50 52 67 SB18 SB18_2.5 2.5 7/7/2015 0.57 7.5 280 0.55 ND<0.25 83 13 32 9.0 ND<0.050 0.53 99 ND<0.50 ND<0.50 ND<0.50 52 59 SB19 SB19_2.5 2.5 7/7/2015 0.71 9.4 180 0.59 ND<0.25 88 14 33 10 0.054 0.69 110 ND<0.50 ND<0.50 ND<0.50 52 65 38424 Cedar Boulevard
SB22 SB22_2.5 2.5 7/9/2015 0.65 5.8 210 ND<0.50 ND<0.25 69 12 28 15 ND<0.050 0.55 81 ND<0.50 ND<0.50 ND<0.50 44 60 SB23 SB23_2.5 2.5 7/9/2015 0.54 5.3 170 ND<0.50 ND<0.25 59 11 28 11 ND<0.050 0.50 68 ND<0.50 ND<0.50 ND<0.50 47 56 SB24 SB24_2.5 2.5 7/9/2015 ND<0.50 7.4 200 0.54 ND<0.25 78 13 30 8.9 ND<0.050 ND<0.50 98 ND<0.50 ND<0.50 ND<0.50 44 58 SB25 SB25_2.5 2.5 7/9/2015 0.61 7.8 200 0.56 ND<0.25 73 13 30 8.3 ND<0.050 0.66 88 ND<0.50 ND<0.50 ND<0.50 46 54 38594 Cedar Boulevard
SB26 SB26_2.5 2.5 7/10/2015 ND<0.50 7.7 250 0.51 ND<0.25 76 13 31 9.1 ND<0.050 ND<0.5 98 ND<0.50 ND<0.50 ND<0.50 44 60 11 12 a 15,000 16 78 12,000 23 3,100 80 13 390 270 c 390 390 0.78 390 23,000 Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

All data are reported in milligrams per kilogram (mg/kg).

California Assessment Manual 17 (CAM17) metals analyzed by EPA Method 6020. a
Arsenic is naturally-occurring in soil. The estimated site-background maximum concentration of arsenic is 12 mg/kg. b
Samples were analyzed for total chromium. Results are compared against screening levels for chromium III. c
Nickel is naturally-occurring in soil. The estimated site-background maximum concentration of nickel is 270 mg/kg (LBNL, 2002).

ESL = environmental screening level
ND = not detected at or above the laboratory reporting limit shown RWQCB = Regional Water Quality Control Board
[1] Environmental Screening Levels. San Francisco Bay Regional Water Quality Control Board. Residential: Shallow Soil Exposure. January 2019.

Screening Value from San Francisco Bay RWQCB ESL
for Residential Land Use [1]

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Table 2: Organochlorine Pesticides Detected in Soil Samples* Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location Sample ID
Sample Depth
(feet bgs)
Sample
Date p,p-DDD p,p-DDE p,p-DDT
38288 Cedar Boulevard
SB01 SB01_2.5 2.5 7/7/2015 ND<0.0050 ND<0.0050 ND<0.0050 SB02 SB02_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB03 SB03_2.5 2.5 7/7/2015 ND<0.0050 ND<0.0050 0.0093
SB04 SB04_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB05 SB05_2.5 2.5 7/7/2015 ND<0.0010 0.0014 ND<0.0010
SB06 SB06_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB07 SB07_2.5 2.5 7/7/2015 ND<0.050 ND<0.050 ND<0.050
SB08 SB08_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB09 SB09_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB10 SB10_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 38370 Cedar Boulevard
SB11 SB11_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB12 SB12_2.5 2.5 7/7/2015 ND<0.10 ND<0.10 ND<0.10
SB13 SB13_2.5 2.5 7/7/2015 ND<0.0010 0.014 ND<0.0010
SB14 SB14_2.5 2.5 7/7/2015 ND<0.020 ND<0.020 ND<0.020
SB15 SB15_2.5 2.5 7/7/2015 ND<0.020 ND<0.020 ND<0.020
SB16 SB16_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB17 SB17_2.5 2.5 7/7/2015 ND<0.0050 ND<0.0050 ND<0.0050 SB18 SB18_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB19 SB19_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 38424 Cedar Boulevard
SB22 SB22_2.5 2.5 7/9/2015 0.013 0.020 ND<0.0050
SB23 SB23_2.5 2.5 7/9/2015 0.0068 0.023 0.0079
SB24 SB24_2.5 2.5 7/9/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB25 SB25_2.5 2.5 7/9/2015 ND<0.0010 ND<0.0010 ND<0.0010 38594 Cedar Boulevard
SB26 SB26_2.5 2.5 7/10/2015 ND<0.0010 ND<0.0010 ND<0.0010

2.7 1.8 1.9
Notes:

All data are reported in milligrams per kilogram (mg/kg).

Organochlorine pesticides (OCPs) analyzed by EPA Method 8081A.

Polychlorinated biphenyls (PCBs) analyzed by EPA Method 8082. bgs = below ground surface
DDD = dichlorodiphenyldichloroethane
DDE = dichlorodiphenylethylene
DDT = dichlorodiphenyltrichloroethane
ESL = environmental screening level
ND = not detected at or above the laboratory reporting limit shown PCB = polychlorinated biphenyls
RWQCB = Regional Water Quality Control Board
[1] Environmental Screening Levels. San Francisco Bay Regional Water Quality Control Board.

Residential: Shallow Soil Exposure. January 2019.

Screening Value from San Francisco Bay RWQCB ESL
for Residential Land Use [1]
Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.
* The soil samples were also analyzed for PCBs, and no PCBs were detected above the laboratory reporting limit for that PCB compound.

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Table 3: Total Petroleum Hydrocarbons in Soil Samples
Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location Sample ID
Sample Depth
(feet bgs)
Sample
Date TPH(g) TPH(d) TPH(mo)
38288 Cedar Boulevard
SB01 SB01_2.5 2.5 7/7/2015 ND<1.0 2.6 20
SB02 SB02_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB03 SB03_2.5 2.5 7/7/2015 ND<1.0 1.4 10
SB04 SB04_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 8.6
SB05 SB05_2.5 2.5 7/7/2015 ND<1.0 3.2 14
SB06 SB06_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB07 SB07_2.5 2.5 7/7/2015 ND<1.0 7.7 120
SB08 SB08_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB09 SB09_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB10 SB10_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB27 SB27_9.0 9.0 1/16/2019 ND<1.0 ND<1.0 ND<5.0
SB27 SB27_14.5 14.5 1/16/2019 ND<1.0 ND<1.0 ND<5.0
MW-8 MW-8_8.5 8.5 7/8/2015 ND<1.0 ND<1.0 ND<5.0
MW-8 MW-8_12.0 12 7/8/2015 ND<1.0 ND<1.0 ND<5.0
MW-9 MW-9_9.0 9 7/8/2015 ND<1.0 ND<1.0 ND<5.0
MW-9 MW-9_12.0 12 7/8/2015 ND<1.0 ND<1.0 ND<5.0
SV06 SV06_11.5 11.5 7/8/2015 ND<1.0 ND<1.0 ND<5.0
38370 Cedar Boulevard
SB11 SB11_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB12 SB12_2.5 2.5 7/7/2015 2.7 170 290
SB13 SB13_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB14 SB14_2.5 2.5 7/7/2015 ND<1.0 15 60
SB15 SB15_2.5 2.5 7/7/2015 ND<1.0 27 150
SB16 SB16_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 5.2
SB17 SB17_2.5 2.5 7/7/2015 ND<1.0 17 51
SB18 SB18_2.5 2.5 7/7/2015 ND<1.0 2.0 ND<5.0
SB19 SB19_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB20 SB20_8.5 8.5 7/9/2015 57 140 72
SB20 SB20_11.0 11 7/9/2015 ND<1.0 ND<1.0 ND<5.0
SB20 SB20_13.5 13.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
SB20 SB20_16.0 16 7/9/2015 ND<1.0 ND<1.0 ND<5.0
SB21 SB21_11.0 11 7/9/2015 93 320 160
SB21 SB21_13.0 13 7/9/2015 31 25 32
SB21 SB21_16.0 16 7/9/2015 180 240 110
SB21 SB21_19.0 19 7/9/2015 24 31 30
EW-1 EW-1_9.0 9 1/17/2019 16 61 22
EW-1 EW-1_11.0 11 1/17/2019 3 2.0 ND<5.0
EW-1 EW-1_24.0 24 1/17/2019 1,100 60 ND<5.0
EW-1 EW-1_30.0 30 1/17/2019 2.7 1.5 ND<5.0
EW-1 EW-1_35.0 35 1/17/2019 ND<1.0 1.5 ND<5.0
MW-4 MW-4_8.0 8 7/10/2015 ND<1.0 ND<1.0 ND<5.0
MW-4 MW-4_12.0 12 7/10/2015 ND<1.0 ND<1.0 ND<5.0
MW-4 MW-4_17.0 17 7/10/2015 47 40 13
MW-4 MW-4_18.5 18.5 7/10/2015 48 43 22
MW-5 MW-5_11.5 11.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-5 MW-5_15.0 15 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-5 MW-5_18.5 18.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-6 MW-6_9.0 9 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-6 MW-6_12.5 12.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-7 MW-7_9.0 9 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-7 MW-7_12.0 12 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-7 MW-7_15.5 15.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-10 MW-10_9.0 9 1/16/2019 ND<1.0 ND<1.0 ND<5.0
MW-10 MW-10_12.0 12 1/16/2019 ND<1.0 ND<1.0 ND<5.0
38424 Cedar Boulevard
SB22 SB22_2.5 2.5 7/9/2015 ND<1.0 6.6 16
SB23 SB23_2.5 2.5 7/9/2015 ND<1.0 1.7 11
SB24 SB24_2.5 2.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
SB25 SB25_2.5 2.5 7/9/2015 ND<1.0 1.8 ND<5.0
38594 Cedar Boulevard
SB26 SB26_2.5 2.5 7/10/2015 ND<1.0 ND<1.0 ND<5.0
SB28 SB28_9.5 9.5 1/15/2019 ND<1.0 ND<1.0 ND<5.0
430 260 12,000 Screening Value from San Francisco Bay RWQCB ESL for Residential Land Use [1]

Page 3 of 15 ends

Packet Page 2119
Table 3: Total Petroleum Hydrocarbons in Soil Samples
Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location Sample ID
Sample Depth
(feet bgs)
Sample
Date TPH(g) TPH(d) TPH(mo)
B4 B4-6.0 6 11/1/2007 ND<0.22 110 NA
B4 B4-12.0 12 11/1/2007 240 110 NA
B5 B5-7.0 7 11/1/2007 ND<0.22 1.1 NA
B5 B5-10.0 10 11/1/2007 ND<0.23 ND<0.99 NA
B5 B5-20.0 20 11/1/2007 ND<0.23 ND<0.99 NA
B6 B6-7.0 7 11/2/2007 ND<0.22 4.6 NA
B6 B6-12.0 12 11/2/2007 ND<0.24 ND<0.99 NA
B6 B6-16.0 16 11/2/2007 4.3 ND<1.0 NA
B7 B7-8.0 8 11/2/2007 ND<0.24 ND<0.99 NA
B7 B7-10.5 10.5 11/2/2007 ND<0.24 21 NA
B7 B7-16.0 16 11/2/2007 3.7 ND<0.99 NA
B8 B8-8.0 8 11/2/2007 6.6 30 NA
B8 B8-12.0 12 11/2/2007 ND<0.23 ND<0.99 NA
B9 B9-8.0 8 11/2/2007 0.32 87 NA
B9 B9-11.0 11 11/2/2007 0.88 44 NA
B12 B12-8.0 8 11/2/2007 0.38 49 NA
B12 B12-12.0 12 11/2/2007 ND<0.25 ND<0.99 NA
SB1 SB1 15 3/5/2001 ND ND NA
SB2 SB2 15 3/5/2001 ND ND NA
SB3 SB3 15 3/5/2001 200 330 NA
MW1 MW1 15 3/5/2001 250 88 NA
MW2 MW2 10 3/5/2001 ND ND NA
MW3 MW3 10 3/5/2001 ND ND NA
430 260 12,000
Notes:

All data are reported in milligrams per kilogram (mg/kg).

Blue shading denotes detection above screening value.

Total petroleum hydrocarbons (TPH) analyzed by EPA Method 8015. bgs = below ground surface
ESL = environmental screening level
ND = not detected at or above the laboratory reporting limit shown "NA"= Not Available
RWQCB = Regional Water Quality Control Board
TPH(d) = total petroleum hydrocarbons diesel range (C10-C23) TPH(g) = total petroleum hydrocarbons gasoline range (C6-C12) TPH(mo) = total petroleum hydrocarbons motor oil range (C18-C36) [1] Environmental Screening Levels. San Francisco Bay Regional Water Quality Control Board.

Residential: Shallow Soil Exposure. January 2019.

Historical Soil Samples Collected at the Site
Only compounds detected above the laboratory reporting limit are included in the table and are shown in bold.

Screening Value from San Francisco Bay RWQCB ESL
for Residential Land Use [1]

Page 4 of 15 ends

Packet Page 2120
Table 4: Volatile Organic Compounds in Soil Samples
Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location Sample ID
Sample
Depth
(feet bgs)
Sample
Date Benzene
n-Butyl
benzene
sec-Butyl
benzene
tert-Butyl
benzene Ethylbenzene Isopropylbenzene Naphthalene
n-Propyl
benzene Toluene
1,2,4-
Trimethylbenzene
1,3,5-
Trimethylbenzene m,p-Xylene o-Xylene
Xylenes,
Total
38288 Cedar Boulevard
SB27 SB27_9.0 9 1/16/2019 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 SB27 SB27_14.5 14.5 1/16/2019 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 38370 Cedar Boulevard
EW-1 EW-1_9.0 9 1/17/2019 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 EW-1 EW-1_11.0 11 1/17/2019 ND<0.0079 0.0085 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 EW-1 EW-1_24.0 24 1/17/2019 2.9 2.7 ND<0.81 ND<0.81 8.2 0.99 3.2 3.6 1.3 19 5.9 15 5.7 21 EW-1 EW-1_30.0 30 1/17/2019 0.011 0.012 ND<0.0050 ND<0.0050 0.017 ND<0.0050 0.0087 0.012 ND<0.0050 0.073 0.022 0.038 0.015 0.053 EW-1 EW-1_35.0 35 1/17/2019 0.0098 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 MW-4 MW-4_8.0 8 7/10/2015 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 NA NA ND<0.0079 MW-4 MW-4_12.0 12 7/10/2015 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 NA NA ND<0.0086 MW-4 MW-4_17.0 17 7/10/2015 ND<0.034 0.22 0.10 0.045 ND<0.034 ND<0.034 ND<0.034 ND<0.034 ND<0.034 ND<0.034 ND<0.034 NA NA ND<0.034 MW-4 MW-4_18.5 18.5 7/10/2015 ND<0.036 0.22 0.13 0.051 ND<0.036 ND<0.036 ND<0.036 ND<0.036 ND<0.036 ND<0.036 ND<0.036 NA NA ND<0.036 MW-6 MW-6_9.0 9 7/9/2015 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 NA NA ND<0.008 MW-6 MW-6_12.5 12.5 7/9/2015 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 NA NA ND<0.0088 MW-10 MW-10_9.0 9 1/16/2019 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 MW-10 MW-10_12.0 12 1/16/2019 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 SB14 SB14_2.5 2.5 7/10/2015 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 NA NA ND<0.0076 SB15 SB15_2.5 2.5 7/10/2015 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 NA NA ND<0.0082 SB20 SB20_8.5 8.5 7/9/2015 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 NA NA ND<0.0075 SB20 SB20_11.0 11 7/9/2015 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 NA NA ND<0.0076 SB20 SB20_13.5 13.5 7/9/2015 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 NA NA ND<0.0082 SB20 SB20_16.0 16 7/9/2015 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 NA NA ND<0.0078 SB21 SB21_11.0 11 7/9/2015 ND<0.077 0.18 0.093 ND<0.077 ND<0.077 ND<0.077 ND<0.077 ND<0.077 ND<0.077 ND<0.077 ND<0.077 NA NA ND<0.077 SB21 SB21_13.0 13 7/9/2015 ND<0.0075 0.076 0.030 0.013 ND<0.0075 0.021 ND<0.0075 0.086 ND<0.0075 ND<0.0075 ND<0.0075 NA NA ND<0.0075 SB21 SB21_16.0 16 7/9/2015 0.36 0.17 0.063 ND<0.051 ND<0.051 0.12 ND<0.051 0.32 ND<0.051 ND<0.051 ND<0.051 NA NA ND<0.051 SB21 SB21_19.0 19 7/9/2015 2.5 ND<0.032 ND<0.032 ND<0.032 0.054 ND<0.032 0.07 ND<0.032 ND<0.032 ND<0.032 ND<0.032 NA NA 0.048 38594 Cedar Boulevard
SB28 SB28_9.5 9.5 1/15/2019 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085

5.9 -- 3.8 -- 1,100 -- -- -- -- 580 Screening Value from San Francisco Bay RWQCB ESL for Residential Land Use [1] 0.33 -- -- --

Page 5 of 15 ends

Packet Page 2121
Table 4: Volatile Organic Compounds in Soil Samples
Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location Sample ID
Sample
Depth
(feet bgs)
Sample
Date Benzene
n-Butyl
benzene
sec-Butyl
benzene
tert-Butyl
benzene Ethylbenzene Isopropylbenzene Naphthalene
n-Propyl
benzene Toluene
1,2,4-
Trimethylbenzene
1,3,5-
Trimethylbenzene m,p-Xylene o-Xylene
Xylenes,
Total
B4 B4-6.0 6 11/1/2007 ND<0.0044 NA NA NA ND<0.0044 NA NA NA ND<0.0044 NA NA NA NA ND<0.0088 B4 B4-12.0 12 11/1/2007 ND<0.91 NA NA NA ND<0.91 NA NA NA ND<0.91 NA NA NA NA ND<1.8 B5 B5-7.0 7 11/1/2007 ND<0.0045 NA NA NA ND<0.0045 NA NA NA ND<0.0045 NA NA NA NA ND<0.0089 B5 B5-10.0 10 11/1/2007 ND<0.0047 NA NA NA ND<0.0047 NA NA NA ND<0.0047 NA NA NA NA ND<0.0094 B5 B5-20.0 20 11/1/2007 ND<0.0046 NA NA NA ND<0.0046 NA NA NA ND<0.0046 NA NA NA NA ND<0.0091 B6 B6-7.0 7 11/2/2007 ND<0.0045 NA NA NA ND<0.0045 NA NA NA ND<0.0045 NA NA NA NA ND<0.0089 B6 B6-12.0 12 11/2/2007 ND<0.0048 NA NA NA ND<0.0048 NA NA NA ND<0.0048 NA NA NA NA ND<0.0096 B6 B6-16.0 16 11/2/2007 ND<0.0047 NA NA NA ND<0.0047 NA NA NA ND<0.0047 NA NA NA NA ND<0.0094 B7 B7-8.0 8 11/2/2007 ND<0.0049 NA NA NA ND<0.0049 NA NA NA ND<0.0049 NA NA NA NA ND<0.0097 B7 B7-10.5 11 11/2/2007 ND<0.0048 NA NA NA ND<0.0048 NA NA NA ND<0.0048 NA NA NA NA ND<0.0096 B7 B7-16.0 16 11/2/2007 ND<0.0048 NA NA NA ND<0.0048 NA NA NA ND<0.0048 NA NA NA NA ND<0.0095 B8 B8-8.0 8 11/2/2007 ND<0.0050 NA NA NA ND<0.0050 NA NA NA ND<0.0050 NA NA NA NA ND<0.024 B8 B8-12.0 12 11/2/2007 ND<0.0046 NA NA NA ND<0.0046 NA NA NA ND<0.0046 NA NA NA NA ND<0.0092 B9 B9-8.0 8 11/2/2007 ND<0.0048 NA NA NA ND<0.0048 NA NA NA ND<0.0048 NA NA NA NA ND<0.0095 B9 B9-11.0 11 11/2/2007 ND<0.0047 NA NA NA ND<0.0047 NA NA NA ND<0.0047 NA NA NA NA ND<0.0094 B12 B12-8.0 8 11/2/2007 ND<0.0049 NA NA NA ND<0.0049 NA NA NA ND<0.0049 NA NA NA NA ND<0.0098 B12 B12-12.0 12 11/2/2007 ND<0.0050 NA NA NA ND<0.0050 NA NA NA ND<0.0050 NA NA NA NA ND<0.010 SB1 SB1 15 3/5/2001 ND NA NA NA 0.005 NA NA NA ND NA NA NA NA ND SB2 SB2 15 3/5/2001 ND NA NA NA ND NA NA NA ND NA NA NA NA ND SB3 SB3 15 3/5/2001 0.72 NA NA NA 3.3 NA NA NA 0.84 NA NA NA NA 1.1 MW1 MW1 15 3/5/2001 0.87 NA NA NA 5.6 NA NA NA 0.99 NA NA NA NA 6.9 MW2 MW2 10 3/5/2001 ND NA NA NA ND NA NA NA ND NA NA NA NA ND MW3 MW3 10 3/5/2001 ND NA NA NA ND NA NA NA ND NA NA NA NA ND Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

All data are reported in milligrams per kilogram (mg/kg).

Blue shading denotes detection above screening value
Volatile organic compounds (VOCs) analyzed by EPA method 8260B. "NA " = not available
bgs = below ground surface
ESL = environmental screening level
ND = not detected at or above the laboratory reporting limit shown RSL = regional screening level
RWQCB = Regional Water Quality Control Board

0.33 -- -- -- 5.9 -- 3.8 -- 1,100 -- -- -- -- 580
[1] Environmental Screening Levels. San Francisco Bay Regional Water Quality Control Board. Residential: Shallow Soil Exposure. January 2019.

Screening Value from San Francisco Bay RWQCB ESL for
Residential Land Use [1]
Historical Soil Samples Collected at the Site

Page 6 of 15 ends

Packet Page 2122
Table 5: Volatile Organic Compounds in Soil Gas Samples Results of Soil Gas Sampling
38288-38594 Cedar Boulevard, Newark, California
Location Sample ID
Sample
Date
TPH
(gasoline
range) Acetone Benzene 2-Butanone
Carbon
Disulfide Chlorobenzene Chloroethane Chloroform Chloromethane Dibromochloro
methane 1,1-Dichloroethane 1,1-Dichloroethene 1,2-Dibromoethane 1,3-Dichlorobenzene 1,4-Dichlorobenzene Ethanol Ethylbenzene 4-Ethyltoluene 2-Hexanone Methyl-t-Butyl
Ether (MTBE) o-Xylene p/m-Xylene
38288 Cedar Boulevard
SV01 SV01 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV02 SV02 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV03 SV03 7/8/2015 ND<10,000 NA 160 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV04 SV04 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV05 SV05 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV06 SV06 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV39 SV39 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV40 SV40 7/10/2015 18,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 120 330 SV46 [a] SV46-20190318 3/18/2019 NA 12 ND<1.6 ND<4.4 28 ND<2.3 ND<1.3 3.8 ND<1.0 ND<4.3 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<9.4 ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 38370 Cedar Boulevard
SV07 SV07 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 340 1,000 SV08 SV08 7/8/2015 46,000 NA 130 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 1,800 5,600 SV09 SV09 7/8/2015 3,700,000 NA 350 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 200 1,500 SV10 SV10 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV11 SV11 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV12 SV12 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV13 SV13 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS SV14 SV14 7/9/2015 84,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 7,700 22,000 SV14 [a] SV14_Summa 7/9/2015 NA 220 ND<53 ND<150 ND<210 ND<77 ND<44 ND<81 ND<34 ND<140 ND<67 ND<66 ND<130 ND<100 ND<100 NA 100 ND<82 ND<200 ND<240 160 410 SV15 SV15 7/9/2015 790,000 NA 150 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 93,000 250,000 SV15 [a] SV15_Summa 7/9/2015 NA 9,600 67 320 ND<31 ND<12 ND<6.6 ND<12 ND<5.2 ND<21 ND<10 ND<9.9 ND<19 ND<15 ND<15 NA 5,100 1,100 ND<31 ND<36 7,600 19,000 SV16 SV16 7/9/2015 43,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 3,500 8,700 SV17 SV17 7/9/2015 390,000 NA 90 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 41,000 110,000 SV47 [a] SV47-20190318 3/18/2019 NA ND<11 ND<3.8 ND<10 ND<15 ND<5.5 ND<3.1 ND<5.8 ND<2.4 ND<10 ND<4.8 ND<4.7 ND<9.1 ND<7.1 ND<7.1 ND<22 ND<5.1 ND<5.8 ND<15 26 ND<5.1 ND<21 SV48 [a] SV48-20190318 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SV49 [a] SV49-20190315 3/15/2019 NA 24 ND<1.6 ND<4.4 14 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<4.3 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<9.4 ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV50 [a] SV50-20190315 3/15/2019 NA ND<4.8 940 ND<4.4 26 ND<2.3 ND<1.3 3.5 ND<1.0 ND<4.3 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<9.4 200 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV51 [a] SV51-20190318 3/18/2019 NA 15 ND<1.6 ND<4.4 ND<6.2 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<4.3 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<9.4 ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 38424 Cedar Boulevard
SV18 SV18 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV19 SV19 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV19 [a] SV19_Summa 7/9/2015 NA 1,500 170 ND<220 ND<310 ND<120 ND<66 ND<120 53 ND<210 ND<100 ND<99 ND<190 ND<150 ND<150 NA 1,100 130 ND<310 ND<360 340 1,500 SV20 SV20 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV20 [a] SV20_Summa 7/9/2015 NA 840 6.1 43 12 ND<2.4 ND<1.4 ND<2.5 3.5 ND<4.4 ND<2.1 ND<2.1 ND<4.0 ND<3.1 ND<3.1 NA 4.3 ND<2.6 ND<6.4 ND<7.5 3.2 ND<9.0 SV21 SV21 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV22 SV22 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV52 [a] SV52-20190318 3/18/2019 NA 15 ND<1.6 ND<4.4 ND<6.2 ND<2.3 ND<1.3 2.7 ND<1.0 ND<4.3 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<9.4 ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 38456 Cedar Boulevard
SV23 SV23 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV24 SV24 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV25 SV25 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 230 SV26 SV26 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 180 490 38472 Cedar Boulevard
SV27 SV27 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV28 SV28 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 380 800 SV29 SV29 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV30 SV30 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV30 [a] SV30_Summa 7/9/2015 NA 2,100 14 56 23 ND<4.6 ND<2.6 ND<4.9 14 ND<8.5 ND<4.0 ND<4.0 ND<7.7 ND<6.0 ND<6.0 NA 5.2 ND<4.9 ND<12 ND<14 4.6 ND<17 38486 Cedar Boulevard
SV31 SV31 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV32 SV32 7/10/2015 ND<10,000 NA 83 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV32 [a] SV32_Summa 7/9/2015 NA 130 46 27 32 ND<3.0 2.1 ND<3.2 9.2 ND<5.6 ND<2.7 ND<2.6 ND<5.1 ND<4.0 ND<4.0 NA 15 3.8 ND<8.1 ND<9.5 13 31 SV41 [a] SV41_Summa 7/16/2015 NA 140 ND<4.1 20 ND<16 ND<5.9 ND<3.4 ND<6.2 ND<2.6 ND<11 ND<5.2 ND<5.1 ND<9.8 ND<7.7 ND<7.7 ND<24 ND<5.6 ND<6.3 ND<16 ND<18 ND<5.6 ND<22 38592 Cedar Boulevard
SV33 [a] SV33_Summa 7/16/2015 NA 570 29 89 66 ND<4.6 3.1 ND<4.9 12 ND<8.5 ND<4.0 7.5 ND<7.7 ND<6.0 ND<6.0 ND<19 16 ND<4.9 15 ND<14 22 52 SV37 SV37 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV38 SV38 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV42 [a] SV42_Summa 7/16/2015 NA 270 30 94 41 ND<7.0 ND<4.0 ND<7.4 5.7 ND<13 ND<6.1 ND<6.0 ND<12 ND<9.1 ND<9.1 ND<29 ND<6.6 ND<7.4 ND<19 ND<22 ND<6.6 ND<26 38594 Cedar Boulevard
SV34 SV34 7/10/2015 32,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA 350 790 SV34 [a] SV34_Summa 7/9/2015 NA 900 21 110 13 8.4 2.9 ND<3.1 7.1 7.5 ND<2.6 ND<2.5 8.2 8.0 7.8 NA 130 200 ND<7.9 ND<9.2 220 500 SV35 SV35 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA ND<100 ND<200 SV36 [a] SV36_Summa 7/16/2015 NA 220 ND<3.2 18 ND<12 ND<4.6 ND<2.6 ND<4.9 ND<2.1 ND<8.5 ND<4.0 ND<4.0 ND<7.7 ND<6.0 ND<6.0 ND<19 ND<4.3 ND<4.9 ND<12 ND<14 ND<4.3 ND<17 SV43 [a] SV43_Summa 7/16/2015 NA 200 18 37 2,100 ND<9.6 ND<5.5 ND<10 ND<4.3 ND<18 ND<8.4 ND<8.3 ND<16 ND<13 ND<13 ND<39 ND<9.1 ND<10 ND<26 ND<30 13 ND<36 SV44 [a] SV44_Summa 7/16/2015 NA 290 4.5 47 ND<12 ND<4.6 ND<2.6 ND<4.9 3.1 ND<8.5 ND<4.0 ND<4.0 ND<7.7 ND<6.0 ND<6.0 33 ND<4.3 ND<4.9 ND<12 ND<14 ND<4.3 ND<17 SV45 [a] SV45_Summa 7/16/2015 NA 110 12 23 15 ND<3.0 ND<1.7 ND<3.2 2.1 ND<5.6 ND<2.6 ND<5.1 ND<18 ND<4.0 ND<3.0 ND<3.2 6.8 ND<9.5 ND<8.1 ND<7.2 11 24 SV53 [a] SV53-20190315 3/15/2019 NA ND<4.8 ND<1.6 ND<4.4 18 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<4.3 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<9.4 ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 3,300 1,000,000 3.2 170,000 -- 1,700 350,000 4.1 3,100 -- 58 2,400 0.16 -- 8.5 -- 37 -- -- 360 3,500 3,500 Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

All data are reported in micrograms per cubic meter (µg/m3).

Blue shading denotes detection above screening value.

Mobile lab samples analyzed by EPA Method 8260B.
[a] Summa canister sample analyzed by EPA Method TO-15.

RWQCB = Regional Water Quality Control Board
ESL = Environmental Screening Level
1,1 DFA = 1,1 difluoroethane (leak check compound)
NA = Not Available
ND = not detected at or above the laboratory reporting limit shown NS = no sample could be collected
VOC = volatile organic compound
[1] Environmental Screening Levels. San Francisco Bay Regional Water Quality Control Board. Tier 1 ESLs. January 2019.

Screening Value from San Francisco Bay
RWQCB ESL for Residential Land Use [1]

Page 7 of 15 ends

Packet Page 2123
Table 5: Volatile Organic Compounds in Soil Gas Samples Results of Soil Gas Sampling
38288-38594 Cedar Boulevard, Newark, California
Location Sample ID
Sample
Date Styrene Tetrachloroethene Toluene Trichloroethene
Trichlorofluoro
methane 1,1,1-Trichloroethane 1,1,2-Trichloroethane 1,3,5-Trimethylbenzene 1,1,2,2-Tetrachloroethane 1,2,4-Trimethylbenzene Vinyl Acetate 1,1-Difluoroethane
(Leak Check
Compound) Isopropanol Naphthalene
38288 Cedar Boulevard
SV01 SV01 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV02 SV02 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV03 SV03 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV04 SV04 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA 120 SV05 SV05 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV06 SV06 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV39 SV39 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 210 NA ND<10,000 NA ND<70 SV40 SV40 7/10/2015 NA ND<100 980 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV46 [a] SV46-20190318 3/18/2019 ND<6.4 ND<3.4 ND<1.9 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA 38370 Cedar Boulevard
SV07 SV07 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV08 SV08 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 100 NA ND<10,000 NA ND<70 SV09 SV09 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 370 ND<100 1,600 NA ND<10,000 NA 210 SV10 SV10 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV11 SV11 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV12 SV12 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV13 SV13 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS
SV14 SV14 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 150 ND<100 370 NA ND<10,000 NA ND<70 SV14 [a] SV14_Summa 7/9/2015 ND<210 ND<110 ND<63 ND<90 ND<190 ND<91 ND<91 ND<82 ND<230 ND<250 ND<230 350,000 NA NA SV15 SV15 7/9/2015 ND<32 ND<100 760 ND<100 ND<100 ND<100 ND<100 2,100 ND<100 5,900 NA ND<10,000 NA ND<70 SV15 [a] SV15_Summa 7/9/2015 ND<32 ND<17 310 ND<13 ND<28 ND<14 ND<14 980 ND<34 1,800 ND<35 320 NA NA SV16 SV16 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 240 ND<100 900 NA ND<10,000 NA ND<70 SV17 SV17 7/9/2015 NA ND<100 440 ND<100 ND<100 ND<100 ND<100 930 ND<100 2,400 NA ND<10,000 NA ND<70 SV47 [a] SV47-20190318 3/18/2019 ND<15 ND<8.0 ND<4.5 ND<6.4 82 ND<6.5 ND<6.5 ND<5.8 ND<16 ND<17 ND<17 ND<13 ND<29 NA SV48 [a] SV48-20190318 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SV49 [a] SV49-20190315 3/15/2019 ND<6.4 3.5 23 5.2 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA SV50 [a] SV50-20190315 3/15/2019 ND<6.4 ND<3.4 9.8 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA SV51 [a] SV51-20190318 3/18/2019 ND<6.4 ND<3.4 5.7 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA 38424 Cedar Boulevard
SV18 SV18 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV19 SV19 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV19 [a] SV19_Summa 7/9/2015 ND<320 ND<170 640 ND<130 ND<280 ND<140 ND<140 130 ND<340 ND<370 ND<350 260,000 NA NA SV20 SV20 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV20 [a] SV20_Summa 7/9/2015 ND<6.6 ND<3.5 13 3.9 ND<5.8 ND<2.8 ND<2.8 ND<2.6 ND<7.1 ND<7.7 ND<7.3 9,900 NA NA SV21 SV21 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV22 SV22 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV52 [a] SV52-20190318 3/18/2019 ND<6.4 ND<3.4 4.6 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA 38456 Cedar Boulevard
SV23 SV23 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV24 SV24 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV25 SV25 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV26 SV26 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 38472 Cedar Boulevard
SV27 SV27 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV28 SV28 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV29 SV29 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV30 SV30 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV30 [a] SV30_Summa 7/9/2015 ND<13 ND<6.8 27 ND<5.4 ND<11 ND<5.5 ND<5.5 ND<4.9 ND<14 ND<15 140 72,000 NA NA 38486 Cedar Boulevard
SV31 SV31 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV32 SV32 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV32 [a] SV32_Summa 7/9/2015 ND<8.4 ND<4.5 51 ND<3.5 20 120 ND<3.6 ND<3.2 ND<9.1 ND<9.7 ND<9.3 ND<7.1 NA NA SV41 [a] SV41_Summa 7/16/2015 ND<16 ND<8.7 10 ND<6.9 63 9.5 ND<7.0 ND<6.3 ND<18 ND<19 ND<18 ND<14 ND<31 NA 38592 Cedar Boulevard
SV33 [a] SV33_Summa 7/16/2015 ND<13 ND<6.8 200 ND<5.4 ND<11 210 ND<5.5 ND<4.9 ND<14 ND<15 ND<14 ND<11 ND<25 NA SV37 SV37 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV38 SV38 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 110 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 SV42 [a] SV42_Summa 7/16/2015 ND<19 ND<10 22 ND<8.1 ND<17 260 ND<8.3 ND<7.4 ND<21 ND<22 ND<21 ND<16 ND<37 NA 38594 Cedar Boulevard
SV34 SV34 7/10/2015 NA ND<100 270 ND<100 ND<100 ND<100 ND<100 350 ND<100 1,000 NA ND<10,000 NA 95 SV34 [a] SV34_Summa 7/9/2015 29 5.2 180 ND<3.4 ND<7.2 ND<3.5 7.3 240 9.5 770 ND<9.0 2,700 NA NA SV35 SV35 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 170 NA ND<10,000 NA ND<70 SV36 [a] SV36_Summa 7/16/2015 ND<13 ND<6.8 4.2 ND<5.4 ND<11 ND<5.5 ND<5.5 ND<4.9 ND<14 ND<15 ND<14 280 ND<25 NA SV43 [a] SV43_Summa 7/16/2015 ND<27 ND<14 16 ND<11 ND<23 ND<11 ND<11 ND<10 ND<29 ND<31 ND<29 34 ND<51 NA SV44 [a] SV44_Summa 7/16/2015 ND<13 ND<6.8 5.6 ND<5.4 ND<11 ND<5.5 ND<5.5 ND<4.9 ND<14 ND<15 ND<14 8,000 62 NA SV45 [a] SV45_Summa 7/16/2015 ND<6.4 ND<3.4 18 ND<2.7 ND<5.6 17 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 42 ND<12 NA SV53 [a] SV53-20190315 3/15/2019 ND<6.4 8.2 4.9 ND<2.7 ND<5.6 14 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA 31,000 15 10,000 16 -- 35,000 5.8 -- 1.6 -- -- -- -- 2.8 Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

All data are reported in micrograms per cubic meter (µg/m3).

Blue shading denotes detection above screening value.

Mobile lab samples analyzed by EPA Method 8260B.
[a] Summa canister sample analyzed by EPA Method TO-15.

Screening Value from San Francisco Bay
RWQCB ESL for Residential Land Use [1]

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Packet Page 2124
Table 6: VOCs and TPH in Groundwater Samples
Results of Groundwater Sampling
38288-38594 Cedar Boulevard, Newark, California
TPH(g) TPH(d) TPH(mo)
Groundwater Monitoring Wells
MW-1 3/27/2001 6,900 3,200 NA ND NA NA 6,000 NA NA NA 10,000 48,000 4,000 NA 9/19/2002 6,500 2,700 NA 260 NA NA 3,300 NA NA NA 6,300 6,900 6,900 NA 12/13/2002 6,500 2,200 NA 250 NA NA 3,600 NA NA NA 4,700 41,000 3,000 NA 3/13/2003 8,300 2,700 NA 220 NA NA 4,000 NA NA NA 5,700 40,000 4,200 NA 6/19/2003 6,500 2,700 NA 240 NA NA 3,000 NA NA NA 5,800 40,000 6,000 NA 9/15/2003 11,000 4,500 NA 220 NA NA 4,000 NA NA NA 7,200 60,000 4,700 NA 12/19/2003 7,700 2,800 NA 310 NA NA 2,900 NA NA NA 5,400 40,000 5,300 NA 3/23/2004 3,500 1,400 NA 76 NA NA 1,400 NA NA NA 2,900 19,000 5,000 NA 6/10/2004 8,300 3,300 NA 180 NA NA 3,300 NA NA NA 6,600 45,000 4,000 NA 9/9/2004 7,600 3,500 NA 220 NA NA 2,500 NA NA NA 6,700 54,000 5,400 NA 12/6/2004 7,200 3,300 NA ND<1,000 NA NA 1,700 NA NA NA 6,300 43,000 2,600 NA 4/4/2005 5,700 2,700 NA ND<1,000 NA NA 2,200 NA NA NA 4,700 33,000 160 NA 6/27/2005 5,400 2,300 NA ND<1,000 NA NA 1,500 NA NA NA 4,100 29,000 2,900 NA 11/4/2005 5,200 2,400 NA 120 NA NA 930 NA NA NA 4,500 40,000 3,800 NA 2/4/2006 5,000 1,800 NA 140 NA NA 630 NA NA NA 3,030 21,000 2,500 NA 5/4/2006 4,700 2,100 NA 120 NA NA 730 NA NA NA 3,100 24,000 3,300 NA 8/4/2006 4,200 2,200 NA 75 NA NA 810 NA NA NA 2,740 26,000 2,900 NA 11/6/2006 3,900 1,700 NA 64 NA NA 640 NA NA NA 2,180 20,000 1,900 NA 2/8/2007 3,200 1,100 NA 51 NA NA 760 NA NA NA 1,790 14,000 2,700 NA 5/14/2007 680 350 NA 9.1 NA NA 150 NA NA NA 360 5,000 870 NA 8/8/2007 3,100 1,400 NA 44 NA NA 630 NA NA NA 2,500 21,000 1,200 NA 11/8/2007 2,700 1,100 NA 29 NA NA 420 NA NA NA 1,200 10,000 1,100 NA 7/20/2015 3,200 780 ND<100 ND<100 350 140 190 180 NA NA 740 20,000 2,600 340 9/21/2018 4,800 ND<100 ND<100 120 340 130 ND<100 ND<100 77 ND<50 77 21,000 2,300 ND<250 3/15/2019 1,600 300 66 ND<50 400 210 62 ND<50 160 ND<50 160 15,000 2,900 ND<250 MW-2 3/27/2001 ND ND NA 3.5 NA NA ND NA NA NA ND ND ND NA 9/19/2002 ND<0.50 ND<0.50 NA 3.5 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 140 NA 12/13/2002 0.95 ND<0.50 NA 2.4 NA NA 0.93 NA NA NA ND<1.0 ND<50 560 NA 3/13/2003 ND<0.50 ND<0.50 NA 1.7 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 360 NA 6/19/2003 ND<0.50 ND<0.50 NA 5.8 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 150 NA 9/15/2003 1.3 1.2 NA 5.7 NA NA 0.91 NA NA NA 1.9 ND<50 67 NA 12/19/2003 ND<0.50 ND<0.50 NA 4.8 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 94 NA 3/23/2004 ND<0.50 ND<0.50 NA 4.2 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 190 NA 6/10/2004 ND<0.50 ND<0.50 NA 6.3 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 ND<50 NA 9/9/2004 ND<0.50 ND<0.50 NA 5.4 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 63 NA

1.0 30 450 5.0 0.17 450 40 15 190 190 20 760 200 410

MCL MCL RSL MCL MCL RSL MCL RSL RSL RSL MCL MCL MCL MCL Volatile Organic Compounds (VOCs)
Isopropylbenzene m,p-Xylene o-Xylene
Total Petroleum
Hydrocarbons (TPH)
Xylenes,
Total
Sample
Location
Sample
Date Benzene Ethylbenzene MTBE Naphthalene Toluene
1,2,4-
Trimethylbenzene
38370 Cedar Boulevard
Screening Value
n-Propyl
benzene

Page 9 of 15 ends

Packet Page 2125
Table 6: VOCs and TPH in Groundwater Samples
Results of Groundwater Sampling
38288-38594 Cedar Boulevard, Newark, California
TPH(g) TPH(d) TPH(mo)
Volatile Organic Compounds (VOCs)
Isopropylbenzene m,p-Xylene o-Xylene
Total Petroleum
Hydrocarbons (TPH)
Xylenes,
Total
Sample
Location
Sample
Date Benzene Ethylbenzene MTBE Naphthalene Toluene
1,2,4-
Trimethylbenzene
n-Propyl
benzene
MW-2 12/6/2004 ND<0.50 ND<0.50 NA ND<5.0 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 310 NA 4/4/2005 ND<0.50 ND<0.50 NA ND<5.0 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 2,100 NA 6/27/2005 ND<0.50 ND<0.50 NA 0.62 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 85 NA 11/4/2005 ND<0.50 ND<0.50 NA 8.8 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 110 NA 2/4/2006 ND<0.50 ND<0.50 NA 4.2 NA NA ND<0.50 NA NA NA 0.57 ND<50 190 NA 5/4/2006 ND<0.50 ND<0.50 NA 0.62 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 97 NA 8/4/2006 ND<0.50 ND<0.50 NA 1.2 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 540 NA 11/6/2006 1.1 1.6 NA 1.6 NA NA 0.92 NA NA NA 2.44 ND<50 ND<50 NA 2/8/2007 ND<0.50 ND<0.50 NA 0.76 NA NA 0.63 NA NA NA 0.84 ND<50 180 NA 5/14/2007 ND<0.50 ND<0.50 NA ND<1.0 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 220 NA 8/8/2007 ND<0.50 ND<0.50 NA 3.1 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 270 NA 11/8/2007 0.71 1.2 NA 1.3 NA NA 4.0 NA NA NA 4.7 ND<50 320 NA 2/6/2008 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 2,300 [a] NA 7/20/2015 NA NA NA NA NA NA NA NA NA NA NA NA NA NA
3/6/2019
MW-3 3/27/2001 ND ND NA 26 NA NA ND NA NA NA ND ND ND NA 9/19/2002 ND<0.50 ND<0.50 NA 50 NA NA ND<0.50 NA NA NA ND<1.0 54 230 NA 12/13/2002 ND<0.50 ND<0.50 NA 66 NA NA ND<0.50 NA NA NA ND<1.0 65 160 NA 3/13/2003 ND<0.50 ND<0.50 NA 57 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 200 NA 6/19/2003 0.57 ND<0.50 NA 33 NA NA 0.54 NA NA NA 1.1 ND<50 160 NA 9/15/2003 ND<0.50 ND<0.50 NA 23 NA NA ND<0.50 NA NA NA ND<1.0 60 170 NA 12/19/2003 ND<0.50 ND<0.50 NA 52 NA NA ND<0.50 NA NA NA ND<1.0 59 120 NA 3/23/2004 ND<0.50 ND<0.50 NA 14 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 220 NA 6/10/2004 ND<0.50 ND<0.50 NA 15 NA NA ND<0.05 NA NA NA ND<1.0 ND<0.50 59 NA 9/9/2004 ND<0.50 ND<0.50 NA 36 NA NA ND<0.50 NA NA NA ND<1.0 62 120 NA 12/6/2004 ND<0.50 ND<0.50 NA 24 NA NA ND<0.50 NA NA NA ND<0.50 52 150 NA 4/4/2005 ND<0.50 ND<0.50 NA 7.6 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 830 NA 6/27/2005 ND<0.50 ND<0.50 NA 5.1 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 ND<50 NA 11/4/2005 ND<0.50 ND<0.50 NA 4.8 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 ND<50 NA 2/4/2006 ND<0.50 ND<0.50 NA 5.3 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 ND<50 NA 5/4/2006 ND<0.50 ND<0.50 NA 3.8 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 ND<50 NA 8/4/2006 ND<0.50 ND<0.50 NA 3.2 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 53 NA 11/6/2006 ND<0.50 ND<0.50 NA 3.0 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 ND<50 NA 2/8/2007 ND<0.50 ND<0.50 NA 3.3 NA NA 0.52 NA NA NA 0.58 ND<50 ND<50 NA 5/14/2007 ND<0.50 ND<0.50 NA 2.4 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 ND<50 NA 8/8/2007 ND<0.50 ND<0.50 NA 2.8 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 72 NA 11/8/2007 ND<0.50 ND<0.50 NA 3.2 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 ND<50 NA 2/6/2008 ND<0.50 ND<0.50 NA 1.7 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 1,100 [a] NA 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 MW-4 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 67 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250

1.0 30 450 5.0 0.17 450 40 15 190 190 20 760 200 410

MCL MCL RSL MCL MCL RSL MCL RSL RSL RSL MCL MCL MCL MCL Well destroyed.

Screening Value

Page 10 of 15 ends

Packet Page 2126
Table 6: VOCs and TPH in Groundwater Samples
Results of Groundwater Sampling
38288-38594 Cedar Boulevard, Newark, California
TPH(g) TPH(d) TPH(mo)
Volatile Organic Compounds (VOCs)
Isopropylbenzene m,p-Xylene o-Xylene
Total Petroleum
Hydrocarbons (TPH)
Xylenes,
Total
Sample
Location
Sample
Date Benzene Ethylbenzene MTBE Naphthalene Toluene
1,2,4-
Trimethylbenzene
n-Propyl
benzene
MW-5 7/20/2015 ND<0.50 ND<0.50 ND<0.50 1.3 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 MW-6 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 MW-7 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 MW-10 3/6/2019 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<50 ND<50 ND<250 38288 Cedar Boulevard
MW-8 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 MW-9 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 100 ND<250 One-Time Groundwater Samples
B6 11/2/2007 ND<2.5 40 NA ND<2.5 NA NA ND<2.5 NA NA NA ND<5.0 4,400 1,300 NA B7 11/2/2007 ND<5.0 15 NA 7.1 NA NA ND<5.0 NA NA NA 10 2,800 44,000 NA B8 11/2/2007 0.98 ND<0.50 NA 0.98 NA NA ND<0.50 NA NA NA ND<1.0 590 600 NA B10 11/1/2007 ND<0.50 ND<0.50 NA 1.3 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 74 NA B11 11/2/2007 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA NA NA ND<1.0 240 210 NA B13 11/1/2007 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA NA NA ND<1.0 96 53 NA B14 11/1/2007 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 57 NA SB1 3/5/2001 44 190 NA ND NA NA 66 NA NA NA ND 11,000 31,000 NA SB2 3/5/2001 2.8 1.1 NA 7.8 NA NA 0.72 NA NA NA 1.5 260 130 NA SB3 3/5/2001 230 1,200 NA ND NA NA 39 NA NA NA 120 17,000 5,900 NA EW-1 3/14/2019 220 56 ND<10 ND<10 29 15 130 34 100 43 140 2,400 350 ND<250 38288 Cedar Boulevard
SB27 1/16/2019 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<50 83 720 38594 Cedar Boulevard
SB28 1/15/2019 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<50 330 3,100

1.0 30 450 5.0 0.17 450 40 15 190 190 20 760 200 410

MCL MCL RSL MCL MCL RSL MCL RSL RSL RSL MCL MCL MCL MCL Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

Duplicate samples are italicized.

All data are reported in micrograms per liter (µg/L).

Blue shading denotes detection above regulatory screening level.

Volatile organic compounds (VOCs) analyzed by EPA method 8260B.

Total petroleum hydrocarbons (TPH) analyzed by EPA Method 8015.

MCL = Maximum Contaminant Level
RSL = USEPA Region 9 Regional Screening Level for tap water ND = not detected at or above laboratory reporting limit shown TPH(d) = total petroleum hydrocarbons diesel range (C10-C23) TPH(g) = total petroleum hydrocarbons gasoline range (C6-C12) TPH(mo) = total petroleum hydrocarbons motor oil range (C18-C36) [a] Reported TPH(d) concentration suspect due to apparent surface water infiltration into well.

Screening Value Sources:

MCL = Environmental Screening Levels. San Francisco Bay Regional Water Quality Control Board. MCL Priority. January 2019.

RSL = USEPA Screening Levels for Chemical Contaminants. RSL Summary Table (TR=1E-6, HQ=1). April 2019.

Screening Value
38370 Cedar Boulevard

Page 11 of 15 ends

Packet Page 2127
Table 7: Summary of Groundwater Elevations
38288-38594 Cedar Boulevard, Newark, California
Well No.

Date
Measured
TOC Elevation
(feet above
MSL)
Depth to
Groundwater
(feet below
TOC)
Groudwater
Elevation
(feet above
MSL)
MW-1 3/27/2001 30.33 9.01 21.32
9/19/2002 30.33 10.59 19.74
12/13/2002 30.33 10.85 19.48
3/13/2003 30.33 9.41 20.92
6/19/2003 30.33 9.56 20.77
9/15/2003 30.33 10.39 19.94
12/19/2003 30.33 10.43 19.90
3/23/2004 30.33 9.77 20.56
6/10/2004 30.33 10.50 19.83
9/9/2004 30.33 11.21 19.12
12/6/2004 30.33 11.25 19.16
4/4/2005 30.33 9.02 21.31
6/27/2005 30.33 9.34 20.99
11/4/2005 30.33 10.29 20.04
2/4/2006 30.33 9.12 21.21
5/4/2006 30.33 8.50 21.83
8/4/2006 30.33 9.29 21.04
11/6/2006 30.33 10.13 20.20
2/8/2007 30.33 9.78 20.55
5/14/2007 30.33 9.59 20.74
8/8/2007 30.33 10.40 19.93
11/8/2007 30.33 9.72 20.61
7/20/2015 30.63a 10.34 20.29
9/21/2018 30.63 10.91 19.72
3/11/2019 30.63 8.75 21.88
MW-2 3/27/2001 30.42 9.65 20.77
9/19/2002 30.42 10.74 19.68
12/13/2002 30.42 10.61 19.81
3/13/2003 30.42 9.81 20.61
6/19/2003 30.42 9.73 20.69
9/15/2003 30.42 10.49 19.93
12/19/2003 30.42 10.49 19.93
3/24/2004 30.42 9.91 20.51
6/10/2004 30.42 10.61 19.81
9/9/2004 30.42 11.35 19.07
12/6/2004 30.42 11.30 19.12
4/4/2005 30.42 7.03 23.39
6/27/2005 30.42 9.46 20.96
11/4/2005 30.42 10.50 19.92
2/4/2006 30.42 9.25 21.17
5/4/2006 30.42 8.47 21.95
8/4/2006 30.42 9.46 20.96
11/6/2006 30.42 10.20 20.22
2/8/2007 30.42 10.12 20.30

Page 12 of 15 ends

Packet Page 2128
Table 7: Summary of Groundwater Elevations
38288-38594 Cedar Boulevard, Newark, California
Well No.

Date
Measured
TOC Elevation
(feet above
MSL)
Depth to
Groundwater
(feet below
TOC)
Groudwater
Elevation
(feet above
MSL)
MW-2 5/14/2007 30.42 9.75 20.67
8/8/2007 30.42 10.43 19.99
11/8/2007 30.42 10.95 19.47
2/6/2008 30.42 8.96 21.46
7/20/2015 30.73a 10.49 20.24
3/6/2019
MW-3 3/27/2001 30.84 9.20 21.64
9/19/2002 30.84 11.17 19.67
12/13/2002 30.84 11.39 19.45
3/13/2003 30.84 9.99 20.85
6/19/2003 30.84 10.15 20.69
9/15/2003 30.84 10.94 19.90
12/19/2003 30.84 11.01 19.83
3/24/2004 30.84 10.29 20.55
6/10/2004 30.84 11.05 19.79
9/9/2004 30.84 11.70 19.19
12/6/2004 30.84 11.75 19.74
4/4/2005 30.84 9.22 21.62
6/27/2005 30.84 9.88 20.96
11/4/2005 30.84 10.89 19.95
2/4/2006 30.84 9.42 21.42
5/4/2006 30.84 8.95 21.89
8/4/2006 30.84 9.87 20.97
11/6/2006 30.84 10.71 20.13
2/8/2007 30.84 10.59 20.25
5/14/2007 30.84 10.19 20.65
8/8/2007 30.84 10.96 19.88
11/8/2007 30.84 11.35 19.49
2/6/2008 30.84 9.88 20.96
7/20/2015 31.19a 11.00 20.19
9/21/2018 31.19 11.34 19.85
3/11/2019 31.19 9.35 21.84
MW-4 7/20/2015 29.91 9.22 20.69
9/21/2018 29.91 10.11 19.80
3/11/2019 29.91 7.85 22.06
MW-5 7/20/2015 31.45 11.82 19.63
9/21/2018 31.45 11.72 19.73
3/11/2019 31.45 9.67 21.78
MW-6 7/20/2015 30.57 10.99 19.58
9/21/2018 30.57 10.99 19.58
3/11/2019 30.57 9.03 21.54
MW-7 7/20/2015 31.43 11.55 19.88
9/21/2018 31.43 11.69 19.74
3/11/2019 31.43 9.69 21.74
Well destroyed.

Page 13 of 15 ends

Packet Page 2129
Table 7: Summary of Groundwater Elevations
38288-38594 Cedar Boulevard, Newark, California
Well No.

All measurements are in feet and well elevations measured to the top of each well casing.

MSL = mean sea level
TOC = top of casing
a Well casings were repaired on July 13, 2015 and resurveyed by Ruggeri-Jensen-Azar along with wells MW-4 through MW-9 on July 23, 2015.

Page 14 of 15 ends

Packet Page 2130
Table 8: Summary of Groundwater Extraction at EW-1
Results of Groundwater Extraction Test
38288-38594 Cedar Boulevard, Newark, California
EW-1 MW-1 MW-3 MW-5

9.06 8.75 9.35 9.67

2.0 - 2.75 597 597 11.61 9.62 9.35 9.67
3/12/2019 2.0 - 7.5 2,143 2,740 22.07 11.2 9.56 9.8
3/13/2019 7.5 3,613 6,353 25.27 11.6 9.87 10.07
3/14/2019 7.5 1,826 8,178 25.01 11.5 9.84 10.02
Notes:
* All other depth to water measurements collected at end of day immediately prior to pump shutdown.

Volume measurements are approximate.
bTOC = below top of casing
gpm = gallons per minute
3/11/2019 Initial depth to water measurements prior to pumping* Date
Pump Flow
Rate
(gpm)
Daily Volume
Extracted
(gallons)
Cumulative
Volume
Extracted
(gallons)
Depth to Water (feet bTOC)

Page 15 of 15 ends

Packet Page 2131
Site Characterization Report – Revision 1
38288 – 38370 Cedar Boulevard, Newark, California
Ramboll

FIGURES
Packet Page 2132
SITE

QUADRANGLE KEY MAP
0 0.5 1

SCALE IN MILES
NOTES:

CONTOUR INTERVAL 20 FEET
Q:\DRAWINGS\1690009004\1690009004-Site Location map.mxd Site Location Map
38288-38594 Cedar Boulevard
Newark, California
DRAFTED BY: RS DATE: 7/5/2019
FIGURE
1 1690009004
SITE
LEGEND:

SITE BOUNDARY
0 2,000 4,000 6,000

SCALE IN FEET
SOURCE: USGS The National Map: National Boundaries Dataset, National Elevation Dataset, Geographic Names Information System, National Hydrography Dataset, National Land Cover Database, National Structures Dataset, and National Transportation Dataset; U.S. Census Bureau - TIGER/Line; HERE Road Data Packet Page 2133
Q:\DRAWINGS\1690009004\1690009004-Layout map.mxd
Public
Storage
Residential
Neighborhood
Church

CEDAR BOULEVARD
NIMITZ FREEWAY (880)

SMITH AVENUE
Residential
Papé
Machinery
Residential
Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community
Vicinity Map
38288-38594 Cedar Boulevard
Newark, California
DRAFTED BY: RS DATE: 7/5/2019
FIGURE
2 1690009004
0 200
Feet
Legend
Site Boundary
Packet Page 2134
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CEDAR BOULEVARD
INTERSTATE 880
38288
Cedar Blvd
38370
Cedar Blvd
38424
Cedar Blvd
38456
Cedar Blvd 38472
Cedar Blvd
38486
Cedar Blvd
38594
Cedar Blvd
38592
Cedar Blvd
EW-1
MW-10
SV48
SV50
SV51
SV47
SV46
SV06
SV53
SB28 SV52
SV33
SV40
MW-9
MW-8
MW-7
MW-6
MW-5
MW-4
MW-3
MW-1
SB25
SB24
SB23 SB22
SB21
SB20
SB19
SB18
SB16
SB15
SB14
SB13
SB11
SB10
SB09
SB08 SB07
SB06
SB05
SB04
SB03
SB02
SB01
SB17
SB12
SV31
SV34
SV43
SV35
SV37
SV38
SV32 SV30
SV36
SB26
SV44
SV39
SV29
SV28
SV27
SV26
SV25
SV24
SV23
SV22
SV21
SV20
SV19
SV18
SV17
SV15
SV08
SV07
SB27
SV03
SV16
SV14
SV12
SV11
SV10
SV09
SV05
SV04 SV02
SV01
SV45
SV41 SV42
SB-1
SB-3
SB-2
Former UST
Excavation
B14
B10
B9
B8 B7
B6
B5
B4
B13
B11
B12
2 Former Tank
Locations
Elevated fuel hydrocarbons
in soil and groundwater. Elevated TPHd and
TPHmo in groundwater.

Sample Location Map
38288-38594 Cedar Boulevard
Newark, California
DRAFTED BY: RS DATE: 9/18/2019
FIGURE
3 1690009004
0 120
Feet
Notes:

ESL= Environmental Screening Levels. San Francisco Bay Regional Water Quality Control Board. January 2019.

Legend
#*#*
Ð Sample Location from 2001
Investigation by EBS
Ò#*#* Sample Location from 2007
Investigation by ACC
Ó!´ Monitoring Well Location
Site Boundary
Soil Vapor Location (2015)
Soil Boring Location (2015)
!>
#*
Soil and Grab Groundwater Sample Location (2019)
Soil Vapor Well Location
Area of potential concern for VOCs
in soil
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CEDAR BOULEVARD
INTERSTATE 880
38288
Cedar Blvd
38370
Cedar Blvd
38424
Cedar Blvd
38456
Cedar Blvd 38472
Cedar Blvd
A
A'
SB27
SV46
SV47 MW-10
SV49
SV50
SV51
SV52
SV48
SV40
MW-9
MW-8
MW-7
MW-6
MW-5
MW-4
MW-3
EW-1
MW-1
SB25
SB24
SB23 SB22
SB21
SB20
SB19
SB18
SB16
SB15
SB14
SB13
SV08
SB10
SB09
SB08 SB07
SB06
SB05
SB04 SB03
SB02 SB01
SB17
SB12
SV30
SV39
SV29
SV26
SV25
SV24
SV23
SV22
SV21
SV20
SV19
SV18
SV17
SV15

SV07
SV06
SV03
SV16
SV14
SV12
SV11
SV10
SV09
SV05
SV04
SV02
SV01
SV
SB-1
SB-3
SB-2
Former UST
Excavation
B14
B10
B9
B8
B7
B6
B5
B4
B13
B11
B12
2 Former Tank
Locations
SB11
Cross-Section Location Map
38288-38594 Cedar Boulevard
Newark, California
DRAFTED BY: RS DATE: 9/18/2019
FIGURE
4 03-21676CC
0 80
Feet
Legend
#*#*
Ð Sample Location from 2001
Investigation by EBS
Ò#*#* Sample Location from 2007
Investigation by ACC
Site Boundary
Lithologic Cross-Section
(See Figure 5)
Notes:

ESL = Environmental Screening Levels.

San Francisco Bay Regional Water Quality Control Board.

January 2019.
!> Soil and Grab Groundwater
Sample Location (2019)
Ó!´ Monitoring Well Location
#*
Soil Vapor Location (2015)
Soil Boring Location (2015)
Soil Vapor Well Location
Area of potential concern for
VOCs in soil
#*
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Packet Page 2136
30'
20'
10'

29.91' MW-4
25'
15'
5'
TD = 22'
TD = 16'
TD = 12'
TD = 20' TD = 20'
TD = 25'
TD = 20'
B7 SB1
B8
MW-1
SB20
B12
MW-2 MW-5
FILL

SILT/SANDY SILT
(ML)

SILT/CLAY
(ML, CL)

SAND/SILTY SAND
(SP/SM)

GRAVELLY SILT/

SANDY SILT WITH GRAVEL

APPROXIMATE

TANK EXCAVATION

OUTLINE

SHALLOW

GROUNDWATER

ELEVATION,
MARCH 11, 2019

BENZENE GROUNDWATER

CONCENTRATION IN
MICROGRAMS PER LITER (µg/L)
TPHg GROUNDWATER

CONCENTRATION IN
MICROGRAMS PER LITER (µg/L) ELEVATION IN FEET MEAN SEA LEVEL DATUM A (NORTH)
A'
(SOUTH)
TD = 15'
(projected

10.0' E)
(projected

6.0' E)
(outside of
UST area
projected

9.0' E) SB21
TD = 25'
TD = 12'
(projected

11.0' E)
(projected

20.0' E)

30.63' 30'
20'
10'
25'
15'
5'

30.73'
32' 32' EW-1

30.99'
TD = 35'
TD = 7.5'
SV-47
(outside of
UST area
projected

9.0' E)
(well destroyed
March 2019)
ND
ND
220*
2,400*
NA
NA
ND
ND
1,600
15,000
220
2,400
NOTES: TPHg = TOTAL PETROLEUM HYDROCARBONS

GASOLINE RANGE
ND = NOT DETECTED ABOVE LABORATORY

REPORTING LIMITS
NA = DATA NOT AVAILABLE, WELL DESTROYED
BENZENE AND TPHg CONCENTRATIONS FROM THE MOST

RECENT SAMPLING OF EACH WELL ARE SHOWN (PERIOD
OF SEPTEMBER 2018 TO MARCH 2019)
* GRAB SAMPLE. ALL OTHER SAMPLES COLLECTED
USING LOW-FLOW METHODOLOGY 0

SCALE IN FEET
25 Vertical Exaggeration = 5x
DRAFTED BY:CAD DATE: DATE
FIGURE 5
PROJECT:1690009004
MGAFFNEY 9/27/19 Q:\DRAWINGS\1690009004 < 1690009004-XSEC > Lithologic Cross Section
38288 - 38594 Cedar Boulevard
Newark, California
Packet Page 2137
Q:\DRAWINGS\1690009004\1690009004-GW map-2019.mxd
Ó!´
Ó´!
Ó´!
Ó!´
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CEDAR BOULEVARD
INTERSTATE 880
38288
Cedar Blvd
38370
Cedar Blvd
38424
Cedar Blvd
38456
Cedar Blvd
38472
Cedar Blvd

22.0 21.75

21.75 EW-1

21.86 MW-8

21.91 MW-7

21.74 MW-1

21.88 MW-10

21.77 MW-9

22.00 MW-6

21.54 MW-5

21.78 MW-4

22.06 MW-3

21.84 22.0
Groundwater Elevation Contour Map - March 2019
38288-38594 Cedar Boulevard
Newark, California
DRAFTED BY: ME DATE: 7/17/2019
FIGURE
6 0 80
Feet
Legend
Groundwater
Elevation Contour,
March 2019
Ó!´ Monitoring Well
Location
Groundwater Elevation
(feet above mean sea level)

20.26 Approximate Direction
of Groundwater Flow
1690009004
Note:

Surveyed elevation datum =
Alameda County BM "ROB-BIR 1979"
Packet Page 2138

18.5 19.5

20.5 21.5

22.5 23.5
January-2000 January-2002 January-2004 January-2006 January-2008 January-2010 January-2012 January-2014 January-2016 January-2018 January-2020 Groundwater Elevaon (feet above mean sea level)
Date
Figure 7: Groundwater Eleva. ons versus Time: MW-1, MW-2 and MW-3 MW-1
MW-3
DRAFTED BY: RS DATE: 7/17/19 1690009004
FIGURE
7 Q:\DRAWINGS\1690009004\f8_tph cONC vS Time MW-1.cdr
Groundwater Elevations versus Time: MW-1 and MW-3
38288 -38594 Cedar Boulevard
Newark, California
Packet Page 2139
0 10,000
20,000
30,000
40,000
50,000
60,000
70,000
January-2000 January-2002 January-2004 January-2006 January-2008 January-2010 January-2012 January-2014 January-2016 January-2018 January-2020 TPH-g and TPH-d Concentraons in Groundwater (micrograms per liter [µg/L]) Date
Figure 8: TPH Concentra. ons versus Time: MW-1
TPH-g
TPH-d
DRAFTED BY: RS DATE: 7/17/19 1690009004
FIGURE
8 Q:\DRAWINGS\1690009004\f8_tph cONC vS Time MW-1_ver2.CDR TPH Concentrations versus Time: MW-1
38288 -38594 Cedar Boulevard
Newark, California
Packet Page 2140
Site Characterization Report – Revision 1
38288 – 38370 Cedar Boulevard, Newark, California
Ramboll

APPENDIX A

BORING LOGS AND WELL CONSTRUCTION DIAGRAMS
Packet Page 2141
Site Characterization Report – Revision 1
38288 – 38370 Cedar Boulevard, Newark, California
Ramboll

APPENDIX B

LABORATORY ANALYTICAL REPORTS
Packet Page 2142
Site Characterization Report – Revision 1
38288 – 38370 Cedar Boulevard, Newark, California
Ramboll

APPENDIX C

GROUNDWATER EXTRACTION TEST DATA TABLES
Packet Page 2143

ADDITIONAL INVESTIGATION AND

CLOSURE REPORT

FREITAS SITE
38288 – 38594 CEDAR BOULEVARD
APNS 92A-2375-2-6 AND 92A-2375-22-1

NEWARK, CALIFORNIA
Prepared for:

Freitas Family Trust
Newark, California
Prepared By:

Ramboll US Consulting
Emeryville, California
Date
September 24, 2021
Project Number
1690019190
Packet Page 2144
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Contents i Ramboll
This document was prepared by Ramboll US Consulting, Inc. under the professional supervision of the following individuals:
___________________________________
Anne W. Gates, P.E.

Senior Managing Consultant
___________________________________
Jason Kane, P.E.

Senior Managing Consultant
__________________________________
Tommy Winger, P.G.

Senior Consultant
Ramboll US Consulting, Inc.
2200 Powell Street, Suite 700
Emeryville, CA 94608
(510) 655-7440
Packet Page 2145
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Contents ii Ramboll

CONTENTS
Page

1. Introduction 1

1.1 Purpose and Objectives 1

2. Site Background 3

2.1 Site History 3

2.2 Regional Setting 5

2.3 Site-Specific Subsurface Conditions 5

2.4 Previous Environmental Investigations 6

3. Ramboll 2021 Investigation 9

3.1 Pre-Field Activities 9

3.2 Soil and Grab Groundwater Sampling in the Newark Aquifer 9

3.3 Installation of MW-11 11

3.4 Groundwater Monitoring at 38370 Cedar Boulevard 11

3.5 Installation and Sampling of MW-12 at 38594 Cedar Boulevard 12

3.6 Installation of Soil Vapor Wells SV51B and SV54 12

3.7 Site-wide Soil Vapor Sampling 12

3.8 Shallow Soil Sampling for Low-Threat Closure 13

3.9 Sensitive Receptor and Well Surveys for Case Closure at 38288 Cedar Boulevard 14

4. Summary of Site Investigation results Conducted to Date 15

4.1 38288 Cedar 15

4.2 38370 Cedar 15

4.3 38424 Cedar 16

4.4 38456 Cedar 17

4.5 38472 Cedar 17

4.6 38486 Cedar 17

4.7 38592 Cedar 17

4.8 38594 Cedar 17

4.9 Low-Threat Closure of Soil Vapor at the Site 18

5. Nature and Extent of Potential Contamination 19

5.1 38288 Cedar 19

5.2 Former USTs at 38370 Cedar 19

5.3 38424 Cedar 20

5.4 38456 Cedar 20

5.5 38472, 38486, and 38592 Cedar 20

5.6 38594 Cedar 20

6. Conclusions and Recommendations 21

6.1 Case Closure at 38288 Cedar 21

6.2 No Further Investigation at 38370 Cedar 21

6.3 No Further Investigation or Remediation at 38424 Cedar 21

6.4 No Further Investigation or Remediation at 38456 Cedar 21 Packet Page 2146
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Contents iii Ramboll

6.5 No Further Investigation or Remediation at 38472 Cedar, 38486 Cedar, and 38592 Cedar 21

6.6 No Further Investigation or Remediation at 38594 Cedar 21

6.7 No Further Investigation of Soil Vapor at the Site 22

6.8 No Further Investigation of Newark Aquifer 22

6.9 Conclusion 22

7. References 23
Packet Page 2147
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Contents iv Ramboll
TABLES
Table 1: Metals in Soil Samples
Table 2: Organochlorine Pesticides Detected in Soil Samples Table 3: Total Petroleum Hydrocarbons in Soil Samples
Table 4: Volatile Organic Compounds in Soil Samples
Table 5: Volatile Organic Compounds in Soil Vapor Samples Table 6: VOCs and TPH in Groundwater Samples
Table 7: Summary of Groundwater Elevations

FIGURES
Figure 1: Site Location Map
Figure 2: Proposed Site Redevelopment Map
Figure 3: Site Layout
Figure 4a: Sample Location Map
Figure 4b: Sample Location Map – Western Portion of Site Figure 5: Groundwater Elevation Contour Map – December 2020 Figure 6: Map of Sensitive Receptors (0.25-Mile Radius) Figure 7: ACWD Well Survey Map (0.25-Mile Radius)

APPENDICES
Appendix A: Boring Logs and Well Construction Diagrams
Appendix B: Laboratory Analytical Reports
Appendix C: Low-Threat Closure Assessment
Appendix D: ACWD Well Survey
Packet Page 2148
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Introduction 1 Ramboll

1. INTRODUCTION
On behalf of the Freitas Family Trust, Ramboll US Consulting, Inc. (Ramboll; formerly Ramboll Environ and ENVIRON International Corporation [ENVIRON]) is pleased to present this report regarding subsurface environmental conditions at the Freitas Family Trust properties in Newark, California. The Freitas Family Trust owns several parcels of land encompassing 7.8 acres in size (referred to as the “site” or “Freitas site”) which includes the following addresses: 38288, 38370, 38424, 38456, 38472, 38486, 38592 and 38594 Cedar Boulevard. The location of the site is shown on Figure 1.

Robson Homes is currently in contract to purchase the site from Freitas Family Properties and has submitted an application to the City of Newark to redevelop the site for residential use. The proposed redevelopment (Figure 2) includes the construction of approximately 130 single-family homes across the site with new streets and greenways. The additional investigations were conducted to determine if the site is acceptable for residential redevelopment.

1.1 Purpose and Objectives
The purpose of this report is to provide the Alameda County Water District (ACWD) with the information to issue a no further action determination for the site except, as discussed with the ACWD, closure related to groundwater at 38370 Cedar. In addition, this report provides the results of an additional subsurface investigation conducted in December 2020 at the site. The additional subsurface investigation was proposed in the Work Plan for Additional Subsurface Investigation, 38288-38594 Cedar Boulevard, Newark, California (the “2020 Investigation Work Plan”), dated October 23, 2020 (Ramboll, 2020b). The additional subsurface investigation addressed data gaps identified at the site in the Site Characterization Report Revision 1, 38288-38594 Cedar Boulevard, Newark, California (the “2020 Site Characterization Report”), dated April 21, 2020 (Ramboll, 2020a), and included the installation and sampling of two new monitoring wells, one deep soil and grab groundwater boring, one shallow soil boring, one new soil vapor well, sampling of eight existing soil vapor wells, and sampling of the eight groundwater monitoring wells at the 38370 Cedar Boulevard (38370 Cedar) property. The 2020 Investigation Work Plan was approved by Eileen Chen of ACWD.

With regards to groundwater at 38370 Cedar, Ramboll prepared a Remedial Action Work Plan – Revision 1, 38370 Cedar Boulevard, Newark, California, dated March 26, 2021 (herein referred to as the “Remedial Action Work Plan”; Ramboll, 2021) to specifically address petroleum hydrocarbon impacts to groundwater within the former underground storage tank (UST) area at 38370 Cedar. The Remedial Action Work Plan proposed remediation of petroleum hydrocarbons in soil and groundwater in the UST area using insitu chemical oxidation (ISCO). The overall objective of the remedial injections was to reduce concentrations of petroleum hydrocarbons in groundwater and saturated soil within the footprint of the former UST area at 38370 Cedar. The remedial injections were performed in April 2021. A separate report will be prepared and issued summarizing the field implementation of the remedial injections at 38370 Cedar.

Packet Page 2149
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Introduction 2 Ramboll
The remainder of this report includes a summary of previous site investigations, findings regarding the nature and extent of potential contamination and recommendations regarding site closure.0F
1 1 Except for groundwater at 38370 Cedar.

Packet Page 2150
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Site Background 3 Ramboll

2. SITE BACKGROUND
According to the Alameda County Assessor’s Office, the Assessor’s Parcel Numbers (APNs) for the site are 92A-2375-2-6 and 92A-2375-22-1. The site is approximately 7.8 acres in size and located in a mixed commercial/industrial/residential land use area (Figure 3). The nearest residential areas are located adjacent to the southwest and northeast of the site, across Cedar Boulevard and Interstate-880, respectively.

As shown on Figure 3, the site is developed with six warehouses occupied by various businesses. 38370 Cedar is developed with two garage structures used for the maintenance of trucks and construction equipment, and a small, one-story building used as an office.

The current businesses, which occupy the site, are listed by address below. The warehouse structures are surrounded by asphalt paved driveways and parking areas and the garage structures are surrounded by asphalt and compacted gravel. Concrete driveways connect the southwestern boundary of the site to Cedar Boulevard. There are no on-site surface water bodies.

Site Addresses and Businesses
Address Tenant
38288 Cedar Boulevard Viviano Trucking
38370 Cedar Boulevard Fremont Paving
38424 Cedar Boulevard Applied Air Filters
38456 Cedar Boulevard California Camper Repair; Bracho Marble and Granite 38472 Cedar Boulevard Zipin Out Auto Repair; MT Smog Test; 38486 Cedar Boulevard Eurobaun Motorsports; Freitas Family personal storage 38592 Cedar Boulevard Autoland Car Sales; Newark Commercial Truck Repair 38594 Cedar Boulevard Yama Auto Brokers; Golden State Auto Body

2.1 Site History
The site has been owned by the Freitas Family since approximately 1959. Prior to 1959, the site was an open field used for livestock grazing. Gradually over the next three decades, the site was developed with the current buildings. Various businesses including a paving company, automobile body and mechanical repair companies, and trucking companies have occupied the site. The paving company, Fremont Paving, is owned by the Freitas Family, the site owner. Prior to the construction of Cedar Boulevard in approximately the mid1970s, Timber Street (also known as Cedar Road) ran along the northeastern border of the site parallel to Interstate-880. The former Timber Street corridor is the current on-site parcel 92A-2375-22-1.

Packet Page 2151
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Site Background 4 Ramboll
A brief summary of the historical uses of each site address is provided below. 38288 Cedar Boulevard
This portion of the site was occupied by Fremont Paving from 1959 to 1965 followed by a concrete company, landscaping company, trucking companies. 38288 Cedar Boulevard served as the equipment yard for Fremont Paving from 1959 to 1965, when the business was moved next door to 38370 Cedar Boulevard. As discussed in Section 2.4.2, two USTs were removed from 38288 Cedar Boulevard in 1989.
38370 Cedar Boulevard
Fremont Paving (sole occupant since 1965) began using 38370 Cedar Boulevard as an equipment yard in approximately 1965. The office structure was built in approximately 1978. As discussed in Section 2.4.3, six USTs were removed from this portion of the site in 1989.
38424 Cedar Boulevard
The warehouse at 38424 Cedar Boulevard was reportedly constructed in approximately 1978. The first tenant was Andax Engineering, an Australian company that used the site to house a demonstration industrial machine that waxed cardboard boxes. Although records reviewed at the Newark Fire and Building Departments indicated permits were issued in May 1978 for the construction of a 4-feet diameter, 12-feet long diesel aboveground storage tank (AST) located adjacent to the northeast corner of the building, the site owner indicated no such AST was ever installed. The warehouse is currently occupied by Applied Air Filters. 38456 Cedar Boulevard
The warehouse at 38456 Cedar Boulevard was reportedly constructed in the early 1980s and originally leased by a roofing supply company.
38472 Cedar Boulevard
MAACO, and other automotive body repair and paint shops have occupied this portion of the site since the warehouse constructed in approximately 1983. 38486 Cedar Boulevard
The warehouse was reportedly constructed in approximately 1983. The southern portion of the building was historically occupied by cabinet and woodworking shops. The northern portion of the building was historically and is currently used for the storage of Freitas Family personal property.
38592 Cedar Boulevard
The warehouse was reportedly constructed in approximately 1985 and has been used by various automotive and boat repair business. In 1991 multiple drums of hazardous waste were removed from this portion of the site following vacancy of a boat repair company. The site owner reported the drum removal was performed under the oversight of the County Health Department (presumably Alameda County Department of Environmental Health [ACDEH]) and the matter was resolved to the satisfaction of ACDEH.

Packet Page 2152
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Site Background 5 Ramboll
38594 Cedar Boulevard
Between approximately the 1960s and the construction of the building in 1985, two trucking companies utilized the vacant lot for storage and routine maintenance of their semi-trailer trucks. The warehouse was reportedly constructed in approximately 1985 and has been used for storage by the Newark School District, an automotive body paint shop, an automotive upholstery repair business, and an automotive sound system installation business.

2.2 Regional Setting
The site is located within the western portion of the Niles Subarea of the Fremont Groundwater Area, which occupies the southeastern margin of the San Francisco Bay. The Niles Subarea consists of alluvial sediments associated with the Niles Cone. The Niles Cone hydrologic unit includes a shallow “A” Zone Aquifer (approximately 10-30 feet below the ground surface) underlain by three deep regional aquifers: the Newark Aquifer, the Centerville Aquifer and the Fremont Aquifer. The shallow groundwater zone is separated from the deeper Newark Aquifer by the low permeability clays and silty clay that comprise the Newark Aquitard. Regional studies show that the site is located in an area where the Newark Aquitard is between 25 to 30 feet thick (Cioco, 2012). The Newark Aquifer is comprised of interbedded sand and silt layers that typically occur between approximate depths of 50 to 70 feet below ground surface.

Based on topographic maps and public aerial photographs, the site is relatively level, situated at an elevation of roughly 30 to 34 feet above mean sea level (msl). According to published geologic maps (Graymer, 2006), the surficial soils in the site vicinity are identified as Quaternary alluvial terrace deposits of Holocene age as well as older Quaternary alluvial fan deposits of Pleistocene age, typically consisting of dense gravelly and clayey sand and clayey and sandy gravel grading upwards to sandy clay.

2.3 Site-Specific Subsurface Conditions
Based on investigation activities conducted to date, the site is underlain by alluvial deposits consisting of interbedded layers of silt, silty clay, sand, and silty sand to a depth of 35 feet below ground surface (bgs; the “A” Zone Aquifer). Natural soil beneath the fill consists of a fine-grained layer of silt and silty clay that extends to approximate depths of 8 to 11 feet bgs, depending on location. This fine-grained unit is underlain by a layer of sand and silty sand that varies in thickness from about 2 feet up to about 11 feet thick. This first sandy unit is separated from a second deeper sandy unit by thin layer of silt and clay. At most locations, the deeper borings were terminated in silty clay beneath the second sandy layer.

In a deep boring advanced to a total depth of 60 feet bgs at 38370 Cedar, fine grained materials consisting of low permeability clay and silt were observed from 35 feet bgs to a depth of 57 feet bgs (the Newark Aquitard). Coarse materials consisting of gravelly sand were observed from 57 feet bgs to a depth of 60 feet bgs (the Newark Aquifer). Upon drilling into saturated soils in the Newark Aquifer, groundwater equilibrated at a depth of approximately 25 feet bgs.

Historically, groundwater in the A Zone Aquifer has been encountered between approximate depths of 8 and 12 feet bgs. Groundwater flow direction varied but was most frequently to the southwest, south and southeast, generally toward San Francisco Bay. In December 2020, the depth to groundwater in monitoring wells installed in the A Zone Aquifer ranged Packet Page 2153
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Site Background 6 Ramboll
between 10 and 12 feet bgs. Figure 5 presents a groundwater table contour map and groundwater flow direction based on groundwater data from December 2020. Table 7 summarizes historical water elevation measurements at the site. Appendix A contains boring logs, well completion logs, and well survey information.

2.4 Previous Environmental Investigations
As described below, environmental investigations were conducted in conjunction with the removal of two USTs at 38288 Cedar Boulevard and six USTs at 38370 Cedar Boulevard.

The information was garnered from the review of historical documents provided by the ACWD and from interviews with the site owner, Mr. Frank Freitas. In addition, follow-up investigations have been conducted by Ramboll in July 2015, January through March 2019, and December 2020 as detailed in the following work plans and reports that were submitted to ACWD:
• Work Plan for Subsurface Investigation, 38288 – 38594 Cedar Boulevard, Newark, California, prepared by ENVIRON and dated June 16, 2015 (the “2015 Investigation Work Plan” [ENVIRON, 2015]);
• Revised Work Plan for Additional Subsurface Investigation, 38288-38594 Cedar Boulevard, Newark, California, prepared by Ramboll Environ and dated December 19, 2018 (the “2018 Investigation Work Plan” [Ramboll Environ, 2018]); • 2020 Site Characterization Report (Ramboll, 2020a); and, • 2020 Investigation Work Plan (Ramboll, 2020b).

Figures 4a and 4b show the sampling locations from prior environmental investigations as well as Ramboll’s completed investigations through December 2020.

2.4.1 Regulatory Screening Criteria
This report presents the sampling analytical results from all investigations conducted at the site to date through December 2020. Sampling analytical results are compared to the following regulatory screening criteria:
• Soil: ESLs for residential land use for shallow soil exposure (RWQCB, 2019). In the case of arsenic, soil sample analytical results were compared to the regional background concentration (11 milligrams per kilogram [mg/kg]; Duvergé, 2011); • Soil vapor: Subslab/Soil Gas Vapor Intrusion Human Health Risk Levels for residential land use (RWQCB, 2019); and,
• Groundwater:
1) Maximum Contaminant Levels (“MCLs”; CCR, 2014);
2) if no MCL is available, then RWQCB ESLs (RWQCB, 2019); or, 3) if MCLs or ESLs are not available, then United States Environmental Protection Agency (USEPA) Regional Screening Levels (RSLs) for tapwater (USEPA, 2021).

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2.4.2 Former USTs at 38288 Cedar Boulevard
In April 1989, Environmental Bio-Systems, Inc. (EBS) removed a 2,000-gallon gasoline UST and a 1,000-gallon gasoline UST from an area south of the garage structure at 38288 Cedar Boulevard. The USTs were removed under the oversight of the City of Newark Hazardous Materials Bureau. The 2,000-gallon gasoline UST was observed to have slight rusting and pitting with no holes upon removal. The 1,000-gal gasoline UST was observed to have significant pitting and rusting with several small holes along the top of the tank. The location of the former USTs at 38288 Cedar Boulevard are shown in Figure 3. Details regarding soil excavation and confirmation soil sampling performed under the direction of the City of Newark Hazardous Materials Bureau are provided in the 2020 Site Characterization Report.

In 2004, the ACWD initiated a Leaking Underground Fuel Tank (LUFT) case for 38288 Cedar Boulevard, requesting quarterly reports to investigate and remediate soil and groundwater contamination. According to the site owner, no additional subsurface investigations were performed at 38288 Cedar Boulevard in response to the ACWD request until the Ramboll investigations performed in 2015.

2.4.3 Former USTs at 38370 Cedar Boulevard
In February 1989, EBS removed one 8,000-gallon diesel UST, one 5,000-gallon diesel UST, three 1,000-gallon gasoline USTs, and one 550-gallon gasoline UST from an area west of the garage structure at 38370 Cedar Boulevard. The USTs were removed under the oversight of the City of Newark Hazardous Materials Bureau. One of the 1,000-gallon gasoline USTs was observed to have significant rusting, scaling, and pitting visible with multiple holes high and low at both ends of the tank. The other five USTs were observed to have slight rusting and pitting but no visible holes. The location of the former USTs at 38370 Cedar Boulevard are shown in Figure 3. In 1999, ACWD initiated a LUFT case for 38370 Cedar Boulevard, requesting quarterly reports to investigate and remediate soil and groundwater contamination. Details regarding soil excavation and confirmation soil sampling performed under the direction of the City of Newark Hazardous Materials Bureau, as well as soil sampling and groundwater monitoring well installation and sampling conducted between 2001 and 2008, are provided in the 2020 Site Characterization Report.

Historical soil and groundwater sampling data related to the former USTs at 38370 Cedar is summarized in Tables 3, 4, and 6. Historical groundwater elevations are presented in Table

7. Historical sampling and monitoring well locations are shown on Figures 4a and 4b.

2.4.4 Ramboll 2015 Investigation
In July through September 2015, Ramboll conducted the following sampling as detailed in the 2015 Investigation Work Plan and 2020 Site Characterization Report:
• Soil sampling for metals, organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs), total petroleum hydrocarbons (TPH), and volatile organic compounds (VOCs) at locations SB01 through SB26 and SV06 throughout the site; • Soil vapor sampling for VOCs at temporary soil vapor probes installed at locations SV01 through SV12 and SV14 through SV45 throughout the site; and, Packet Page 2155
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• Monitoring well installation and soil and groundwater sampling for TPH and VOCs at locations MW-4 through MW-9 at 38288 and 38270 Cedar Boulevard.

Sampling results from the Ramboll 2015 investigation are detailed in the 2020 Site Characterization Report. Results are summarized in Section 4 of this report and presented in Tables 1 through 7. Sampling locations are provided on Figures 4a and 4b.

2.4.5 Ramboll 2019 Investigation
In January through March 2019, Ramboll conducted the following sampling as detailed in the 2018 Investigation Work Plan and 2020 Site Characterization Report:
• Installation and soil and groundwater sampling of extraction well EW-1 near MW-1; • Installation and soil and groundwater sampling of monitoring well MW-10 on the eastern portion of 38370 Cedar;
• Installation and soil vapor sampling of 8 semi-permanent soil vapor monitoring wells (SV46 through SV53);
• Soil and groundwater sampling of two temporary groundwater borings (SB27 and SB28); and,
• Destruction of monitoring well MW-2 and repair of the surface completions of wells MW-4 and MW-7.

Sampling results from the Ramboll 2019 investigation are detailed in the 2020 Site Characterization Report. Results are summarized in Section 4 of this report and presented in Tables 1 through 7. Sampling locations are provided on Figures 4a and 4b.

The 2018 Investigation Work Plan also included implementation of a 5-day groundwater extraction program at the proposed new extraction well (EW-1) and additional groundwater sampling of monitoring wells at 38370 Cedar after completion of the pumping from the extraction well. The results of the groundwater extraction program are detailed in the 2020 Site Characterization Report.

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3. RAMBOLL 2021 INVESTIGATION
Following ACWD’s review of the data and findings presented in the 2020 Site Characterization Report and as discussed in the 2020 Investigation Work Plan, ACWD requested the following additional data be collected with regards to characterization of the site:
• Soil and grab groundwater samples from the deeper, Newark Aquifer; • Installation of MW-11 and additional groundwater monitoring at 38370 Cedar; • Installation and sampling of MW-12 at 38594 Cedar Boulevard; • Soil vapor well installation at SV54 and Site-wide soil vapor sampling; • Shallow soil sampling for low-threat closure; and
• Well survey and sensitive receptor survey for case closure at 38288 Cedar.

As described below, Ramboll conducted soil sampling, deep grab groundwater sampling, soil vapor well installation and sampling, and groundwater monitoring well installation and sampling at the site in December 2020 to address these data gaps. All work was performed under the oversight of a California-registered Civil Engineer or Geologist and in accordance with the 2020 Investigation Work Plan. Figures 4a and 4b show the soil, deep grab groundwater, soil vapor well, and monitoring well locations.

3.1 Pre-Field Activities
Ramboll contracted with Subdynamic Locating Services, Inc. (Subdynamic), a private utility locating company, to clear proposed boring locations of underground utilities. Ramboll contracted with PeneCore Drilling (PeneCore) to perform drilling activities, and to construct groundwater monitoring wells and semi-permanent soil vapor wells. Ramboll also contracted with Confluence Environmental (Confluence) to perform low-flow purging and sampling activities at site groundwater wells. Finally, Ramboll contracted with McCampbell Analytical Inc. (MAI) for fixed-laboratory analyses of soil and groundwater samples, and Eurofins Calscience for fixed-laboratory analyses of soil vapor samples. The necessary drilling permits were acquired from ACWD prior to drilling activities.

3.2 Soil and Grab Groundwater Sampling in the Newark Aquifer A soil and groundwater investigation of the Newark Aquifer had not been previously performed at the site to confirm that contamination at the former UST area at 38370 Cedar has not impacted the deeper Newark Aquifer.

On December 15, 2020, deep boring SBNA-1 was advanced into the Newark Aquifer along the western portion of the 38370 Cedar portion of the site (see Figure 4b). Under the oversight of Ramboll, a 4.5-inch diameter direct-push boring was drilled from the surface to a total depth of 40 feet bgs using conductor casing. After reaching 40 feet bgs, the conductor casing was left installed in the borehole to seal off the shallow aquifer and a 2.25- inch diameter boring was then advanced from 40 feet bgs to a total depth of 60 feet bgs.

Continuous soil cores were withdrawn, subsurface lithology was logged according to the USCS, and soil was screened for VOCs using a calibrated PID. Soil screened by the PID for VOCs during sampling read less than 1.0 parts per million by volume (ppmv) as isobutylene Packet Page 2157
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at all sample depths. No staining or other visual or olfactory evidence of impacts were observed. During drilling, the shallow unconfined “A” zone aquifer was observed to extend to a depth of approximately 34 feet bgs. From 34 feet bgs to 57 feet bgs, dark greenish grey clays and silts constituting the Newark Aquitard were observed. Below 57 feet bgs, a saturated gravelly sand constituting the Newark Aquifer was observed. The boring log for SBNA-1 is provided in Appendix A.

Soil samples were collected from the interval approximately 1 foot below the top of the Newark Aquitard at a depth of 35 feet bgs, and from the interval approximately 2 feet above the bottom of the Newark Aquitard at a depth of 55 feet bgs. Soil samples were collected in laboratory-provided glass jars and EnCore sampling containers, labeled, placed in doubled zip-closure bags, and stored on ice in an insulated cooler. Samples were transported to MAI with chain-of-custody documentation for chemical analysis on a standard turnaround time (TAT). Soil samples were analyzed for TPH as gas, diesel, and motor oil (TPH-g/d/mo) by USEPA Method 8015B and benzene, toluene, ethylbenzene, and xylene (BTEX) compounds by USEPA Method 8260B.

After reaching total depth, boring SBNA-1 was converted to a temporary groundwater monitoring well using 1-inch diameter polyvinyl chloride (PVC) casing with 0.010-inch slotted screen installed from 55 feet bgs to 60 feet bgs and the inner drill casings were pulled up 5 feet to expose the bottom 5 feet of the boring sidewalls. Upon drilling into saturated soils in the Newark Aquifer, groundwater equilibrated at a depth of approximately 25 feet bgs. A grab groundwater sample was collected using a stainless-steel check ball and ¼-inch Teflon tubing. Prior to sampling, approximately 3 gallons of water were purged from the temporary monitoring well and four consecutive water quality readings were recorded to ensure the sample was representative of the Newark Aquifer. The groundwater sample was collected directly into laboratory-provided and preserved containers, labeled, placed in double zip-closure bags, and stored on ice in an insulated cooler. A trip blank sample provided by the lab was placed in the cooler prior to sample collection. Samples were transported to MAI with chain-of-custody documentation for chemical analysis on a standard TAT. The groundwater sample was analyzed for TPH-g/d/mo by USEPA Method 8015, and BTEX and methyl tert-butyl ether (MTBE) by USEPA Method 8260B. The trip blank sample was analyzed for VOCs by USEPA Method 8260B. Following sampling the boring was backfilled in stages using neat Portland cement under the supervision of an ACWD inspector, as follows: the Newark Aquifer and part of the confining layer were backfilled and sealed off prior to removing conductor casing, and the remaining borehole annulus was then backfilled to the surface.

Soil sampling results for TPH and BTEX are presented in Tables 3 and 4, respectively. TPHg/d/mo and BTEX were not detected above laboratory reporting limits in soil samples collected from the top and bottom of the Newark Aquitard.

Groundwater sampling results are presented in Table 6. TPH-g/d/mo, BTEX, and MTBE were not detected above laboratory reporting limits in the groundwater sample collected from the Newark Aquifer. Laboratory analytical reports are included in Appendix B.

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3.3 Installation of MW-11
Results of groundwater sampling at monitoring wells located upgradient, downgradient, and cross-gradient of the former UST area at 38370 Cedar have not historically detected TPH and fuel-related VOC concentrations above regulatory screening criteria. However, ACWD requested the installation of one additional cross-gradient monitoring well (MW-11; see Figure 5) east of the former UST area between monitoring wells MW-10 and MW-6 to confirm contamination was not migrating in groundwater from the former UST area.

Following installation of MW-11, all wells at 38370 Cedar were sampled (EW-1, MW-1, MW-3 through MW-7, MW-10 and MW-11).

Monitoring well MW-11 was installed on the eastern portion of 38370 Cedar, approximately 10 feet south of soil vapor well SV50. No staining or other visual or olfactory evidence of impacts were observed. Coarse-grained, saturated soil was observed at approximately 10 feet bgs. Well construction was performed under the supervision of an ACWD inspector and in accordance with the 2020 Investigation Work Plan. Well MW-11 was surveyed on April 29, 2021. The boring and well completion log for MW-11 is provided in Appendix A.

On December 18, 2020, monitoring well MW-11 was developed by PeneCore under the oversight of Ramboll, at least 72 hours after installation. The well was surged, bailed, and/or pumped until at least 1 casing volume was removed and water quality parameters stabilized.

3.4 Groundwater Monitoring at 38370 Cedar Boulevard
On December 21, 2020, depth to water measurements were collected at the wells at 38288 Cedar (MW-8 and MW-9) and the wells at 38370 Cedar (EW-1, MW-1, MW-3 through MW-7, MW-10, and MW-11). The overall groundwater flow direction was calculated to the south (see Figure 5).

On December 21 and 22, 2020, wells EW-1, MW-1, MW-3 through MW-7, MW-10 and MW11 were sampled. In accordance with the 2020 Investigation Work Plan, low-flow sampling was performed by Confluence under the oversight of Ramboll using a bladder pump and dedicated tubing. Groundwater quality parameters reached stabilization prior to collection of the groundwater sample. Groundwater samples were analyzed for TPH-g/d/mo by USEPA Method 8015, and BTEX and MTBE by USEPA Method 8260B. The trip blank sample was analyzed for VOCs by USEPA Method 8260B.

Groundwater sampling results are presented in Table 6. Laboratory analytical reports are included in Appendix B. TPH-g/d and benzene were detected above ESLs/MCLs at EW-1 and MW-1. M,p-xylene was also detected above screening criteria at EW-1. Results of sampling at MW-1 are consistent with historical sample results. EW-1 is located approximately 10 feet from MW-1 and had not previously been sampled using low-flow sampling protocols.

Results of sampling at EW-1 are generally consistent with historical sample results at MW-1.

The only other detection above screening criteria was TPH-mo at MW-4. TPH-g/d/mo, BTEX and MTBE were not detected above laboratory reporting limits at MW-3 through MW-7 and MW-10. The only detection at MW-11 was MTBE at a concentration below the MCL.

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3.5 Installation and Sampling of MW-12 at 38594 Cedar Boulevard In January 2019, concentrations of TPH-d and TPH-mo were detected in the grab groundwater sample from SB28 at concentrations above the ESLs, although VOCs and TPH were not detected above laboratory reporting limits in soil samples collected from SB28. To evaluate potential impacts to groundwater at and in the vicinity of grab groundwater sample SB28, monitoring well MW-12 was installed on December 14, 2020 in the northern corner of 38594 Cedar (see Figure 4a).

Monitoring well MW-12 was installed and developed following the same procedures and with the same construction specifications as MW-11 (see Section 3.3). Soil screened by a PID for VOCs during sampling read less than 1.0 ppmv at all sample depths. A petroleum odor was observed during drilling from the ground surface to a depth of approximately 5 feet bgs. A soil sample was collected from a depth of approximately 4 feet bgs and analyzed for TPH-g/d by USEPA Method 8015B, as discussed in Section 3.8. Coarse-grained, saturated soil was observed around 11 feet bgs. Well construction was performed under the supervision of an ACWD inspector and in accordance with the 2020 Investigation Work Plan.

Well MW-12 was surveyed on April 29, 2021.

On December 22, 2020, monitoring well MW-12 was sampled using the low-flow sampling procedures in accordance with the 2020 Investigation Work Plan. The groundwater sample was analyzed for TPH-g/d/mo by USEPA Method 8015, and BTEX and MTBE by USEPA Method 8260B. TPH-g/d/mo, BTEX and MTBE were not detected above laboratory reporting limits in the sample collected from MW-12. Groundwater sampling results are presented in Table 6. Laboratory analytical reports are included in Appendix B.

3.6 Installation of Soil Vapor Wells SV51B and SV54
In July 2015, benzene was detected at a concentration above the residential ESL in soil vapor sample SV32 at 38486 Cedar. To further evaluate the benzene detection at SV32, soil vapor well SV54 was installed approximately 5 feet southeast of historical soil vapor sample location SV32.

Soil vapor well SV51 was discovered in December 2020 to be damaged by site operations.

As a replacement, soil vapor well SV51B was installed approximately 5 feet north of SV51.

SV51 was destroyed under the oversight of an ACWD inspector.

Soil vapor wells SV51B and SV54 were installed on December 16, 2020 in accordance with the 2020 Site Investigation Work Plan and the RWQCB and California Environmental Protection Agency (Cal/EPA) Department of Toxic Substances Control’s (DTSC) Advisory on Active Soil Gas Investigations (the “Advisory”). The locations of SV51B and SV54 are shown on Figure 4a. Soil screened by the PID for VOCs during sampling read less than 2.1 ppmv at all sample depths. No staining or other visual or olfactory evidence of impacts were observed. Well construction was performed under the supervision of an ACWD inspector.

3.7 Site-wide Soil Vapor Sampling
In March 2019, benzene and ethylbenzene were detected at concentrations above their respective residential ESLs in soil vapor sample SV50, located east of the UST area where historically drums and buckets containing oily waste were stored. SV50 has not been Packet Page 2160
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resampled since the March 2019 sampling event. No other VOCs were detected in soil vapor above ESLs for residential land use in the March 2019 sampling of SV46 through SV54. On December 17 and 18, 2020, soil vapor wells SV46 through SV50, SV51B, and SV52 through SV54 were sampled in accordance with the Advisory and the 2020 Investigation Work Plan. After completion of sample collection, canisters were labelled and shipped to Eurofins Calscience under chain-of-custody documentation for chemical analysis of VOCs including naphthalene by USEPA Method TO-15 and oxygen as a fixed gas by ASTM Method 1946.

Soil vapor sampling results are presented in Table 5. Laboratory analytical reports are included in Appendix B. Tetrachloroethene (PCE) and trichloroethene (TCE) were detected in sample SV52 at concentrations of 130 micrograms per cubic meter (µg/m3) and 23 µg/m3, respectively, above ESLs for residential land use. In Ramboll’s soil vapor sampling conducted at the site to date, PCE and TCE had not previously been detected at concentrations greater than the ESLs for residential land use. On January 20, 2021, SV52 was resampled to confirm the PCE and TCE detections. A duplicate sample was also collected during resampling at SV52. The resample and duplicate sample were sampled and analyzed as previously described in this section. PCE and TCE were not detected above laboratory reporting limits in the resample or duplicate sample collected at SV52 in January 2021.

Benzene was detected in sample SV54 at a concentration of 23 µg/m3, above the residential ESL of 3.2 µg/m3. It is not uncommon to detect low concentrations of benzene and other petroleum-related VOCs in soil vapor samples collected in the vicinity of roadways and parking areas. Stormwater runoff from these areas is likely the source of these low concentrations in soil vapor samples. No other VOCs were detected above ESLs for residential land use in the December 2020 soil vapor sampling at SV46 through SV50, SV51B, and SV52 through SV54. Naphthalene was not detected above laboratory reporting limits in any soil vapor samples.

Oxygen was detected at concentrations ranging between 3.4% at SV47 and 16% at SV50.

Oxygen concentrations were above 4% in all soil vapor samples except SV47.

3.8 Shallow Soil Sampling for Low-Threat Closure
Between December 14 and December 16, 2020, shallow soil samples were collected at MW12 (to evaluate shallow soil in the vicinity of SV53), SB29 (to evaluate shallow soil in the vicinity of SV46), SV51B, and SV54 (see Figures 4a and 4b). At all four locations, a soil sample was collected from a depth of approximately 4 feet bgs in accordance with the 2020 Investigation Work Plan. Soil screened by the PID for VOCs during sampling read less than

0.2 ppmv. No staining or other visual or olfactory evidence of impacts were observed.

Samples were analyzed for TPH-g/d by USEPA Method 8015B.

TPH-d was detected at a concentration of 6.0 mg/kg at MW-12. TPH-g/d was not detected above laboratory reporting limits in all other samples. Shallow soil sampling results with the respect to the California State Water Resources Control Board (SWRCB) Low-Threat Closure Policy (SWRCB, 2012) are presented in Table C.1 in Appendix C.

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3.9 Sensitive Receptor and Well Surveys for Case Closure at 38288 Cedar Boulevard
At the request of ACWD, Ramboll completed a sensitive receptor survey and a well survey within 0.25 miles of the 38288 Cedar and 38370 Cedar portions of the site. The purpose of the sensitive receptor and well surveys is to support case closure of the open regulatory cases at 38288 Cedar (J&M Concrete; ACWD case no. TT0623, RWQCB case no. 01-3514) and 38370 Cedar (Fremont Paving; ACWD case no. TT0590, RWQCB case no. 01-2452).

Ramboll conducted a sensitive receptor survey with a 0.25-mile radius of the 38288 and 38370 Cedar portions at the site. As shown on Figure 6, 38288 and 38370 Cedar are located within a zone of mixed commercial/industrial and residential uses. The following sensitive receptors were identified within a 0.25-mile radius of 38288 and 38370 Cedar Boulevard:
• Residential developments located to the north, across Interstate-880, and located to the west, southwest, and south. Residential areas are shaded blue in Figure 6. • Grace of God Alliance Church and the Kings Kids Preschool located adjacent to the southwest (38325 Cedar Boulevard, Newark, California; shaded orange in Figure 6). • Emmanuel Mission Church located approximately 0.25 mile to the southwest (5885 Smith Avenue, Newark, California; shaded orange in Figure 6). • Birth Grove Park located approximately 0.25 mile to the southwest (38080 Birch Street, Newark, California; shaded green in Figure 6).

Ramboll requested a list of all wells on record at ACWD within 0.25 miles of the 38288 and 38370 Cedar portions of the site. The results of the well survey are provided in Appendix D.

The approximate locations of the only wells (two agricultural wells and one ACWD production well) within 0.25 miles of the site that may be potentially used for production purposes are shown on Figure 7.

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4. SUMMARY OF SITE INVESTIGATION RESULTS

CONDUCTED TO DATE
The following section includes summaries of the results of all sampling conducted to date at each portion of the site as detailed in the 2020 Site Characterization Report and Section 3 of this report. Results of soil, soil vapor and groundwater sampling are summarized in Tables 1 through 7. Sampling locations are shown on Figures 4a and 4b.

4.1 38288 Cedar
All detected concentrations in shallow soil samples collected at 38288 Cedar were below ESLs for residential land use. TPH and VOCs were not detected above laboratory reporting limits in deeper soil samples collected at or in the vicinity of the former USTs at locations SB27 or during the installation of MW-8 or MW-9.

During soil vapor sampling conducted in 2015, concentrations of benzene and naphthalene were reported above ESLs at SV03 and SV04, in the vicinity of the garage structure. No other VOCs were detected above laboratory reporting limits during the 2015 soil vapor sampling at 38288 Cedar, including SV06 which was collected in the location of the former USTs. In March 2019 and December 2020, soil vapor samples were collected from SV46 inside the garage structure; all VOC concentrations were below their respective ESLs.

Monitoring wells MW-8 and MW-9 were installed at 38288 Cedar in 2015 to assess whether prior USTs may have impacted groundwater in this area of the site. To date, only TPH-d has been detected in these wells at concentrations of 50 micrograms per liter (µg/L; MW-8 in 2015) and 100 µg/L (MW-9 in 2019); both concentrations are below the ESL of 200 µg/L.

At the request of ACWD, a grab groundwater sample was collected in the former UST location in 2019 (SB27). TPH-d was detected in the grab groundwater sample at SB27 at 83 µg/L, below the ESL. TPH-mo was detected at 720 µg/L, above the ESL of 410 µg/L.

VOCs were not detected above laboratory reporting limits in groundwater samples collected from MW-8, MW-9, and SB27.

4.2 38370 Cedar
Shallow soil sampling results for samples collected at 38370 Cedar did not report any concentrations above ESLs for residential land use. Concentrations of TPH and petroleumrelated VOCs (including benzene and ethylbenzene) exceed ESLs for residential land use in the soil sample collected at 24 feet bgs during the installation of EW-1 in the former UST area. TPH and petroleum-related VOCs were less than ESLs for residential land use in the soil sample collected at 35 feet bgs at EW-1. Soil samples collected at 11 feet bgs or deeper (below the groundwater table) in SB21 reported concentrations of TPH-d and benzene above the ESLs for residential land use. Soil sampling performed during the installation of MW-4 through MW-7, MW-10, and MW-11 as well as soil borings on the eastern portion of 38370 Cedar did not detect VOCs or TPH-g/d/mo above laboratory reporting limits.

TPH-g/d/mo and BTEX were not detected above laboratory reporting limits in soil samples collected from the top and bottom of the Newark Aquitard.

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Soil vapor samples collected from temporary soil vapor wells at 38370 Cedar identified concentrations of BTEX and naphthalene above ESLs for residential land use in the former UST area as well as the eastern portion of 38370 Cedar in the immediate vicinity of the shed housing the asphalt spreaders where significant fuel staining was observed on the asphalt-paved surface, in the immediate vicinity of the waste oil shed, and where drums and buckets that reportedly contained waste overcoat, tack oil, and miscellaneous unknown materials were historically stored. It should be noted that at SV11 and SV12, no VOCs were detected above laboratory reporting limits. These sampling locations are in the maintenance garage, which is between the former UST area (SV07 through SV09) and the shed housing the asphalt spreaders (SV14 through SV17).

Soil vapor wells SV47 through SV51 were installed at 38370 Cedar in 2019 to confirm previous soil vapor concentrations detected in 2015. Soil vapor well SV47 was installed adjacent to the existing main warehouse and SV48 through SV51 were installed along the eastern boundary of the property. SV51 was later replaced by SV51B in 2020. Soil vapor samples collected from wells SV47 through SV51B in March 2019 and December 2020 only detected two chemicals above ESLs for residential land use: benzene and ethylbenzene in the March 2019 sample at SV50.

Elevated concentrations of fuel-related constituents are localized in shallow groundwater at MW-1 and EW-1. Additional monitoring wells (MW-4 through MW-7, MW-10 and MW-11) installed by Ramboll that are located upgradient, downgradient and cross-gradient of the former UST locations at 38370 Cedar did not detect concentrations of these fuel-related constituents in groundwater above regulatory screening criteria. Furthermore, the results of groundwater monitoring at MW-10 and MW-11 confirm historical and current operations on the eastern portion of 38370 Cedar have not impacted groundwater.

TPH-g/d/mo, BTEX, and MTBE were not detected above laboratory reporting limits in the groundwater sample collected from the Newark Aquifer.

4.3 38424 Cedar
Shallow soil sampling results for samples collected at 38422 Cedar did not report any concentrations above ESLs for residential land use.

Soil vapor samples collected in 2015 from SV19 and SV20, located near the storage area for old car and machine parts, reported benzene concentrations above the residential ESL.

VOCs were not detected above the ESLs in the soil vapor samples from the remainder of 38424 Cedar at SV21 and SV22. In March 2019, soil vapor well SV52 was installed in the vicinity of prior sample locations SV19 and SV20. All VOCs concentrations in the March 2019 sample at SV52 were below their respective ESLs. PCE and TCE were detected in the December 2020 sample at SV52 at concentrations above ESLs for residential land use. In Ramboll’s soil vapor sampling conducted at the site to date, PCE and TCE had not previously been detected at concentrations greater than the ESLs for residential land use. In January 2021, SV52 was resampled to confirm the PCE and TCE detections. A duplicate sample was also collected during resampling at SV52. PCE and TCE were not detected above laboratory reporting limits in the resample or duplicate sample collected at SV52 in January 2021.

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4.4 38456 Cedar
No VOC concentrations were above ESLs in the soil vapor samples collected from 38456 Cedar.

4.5 38472 Cedar
At 38472 Cedar, the only VOC reported above ESLs was benzene in sample SV30 in the southern portion of the site. However, it is common to find benzene at low concentrations in the vicinity of parking areas as stormwater runoff from these areas are likely the source of these low concentrations.

4.6 38486 Cedar
At 38486 Cedar, the only VOC reported above ESLs was benzene at locations SV32 and SV54 in the southern portion of the site. However, it is common to find benzene at low concentrations in the vicinity of parking areas or roads as stormwater runoff from these areas are likely the source of these low concentrations.

4.7 38592 Cedar
At 38592 Cedar, the only VOC reported above ESLs was benzene in samples SV33 and SV42. However, it is common to find benzene at low concentrations in the vicinity of parking areas or roads as stormwater runoff from these areas are likely the source of these low concentrations.

4.8 38594 Cedar
OCPs and TPH were not detected above laboratory reporting limits in the shallow soil sample collected at SB26. TPH and VOCs were not detected above laboratory reporting limits in the soil sample collected from boring SB28.

Concentrations of benzene in SV43, SV44 and SV45 were above the residential ESL.

However, it is common to find benzene at low concentrations in the vicinity of parking areas or roads as stormwater runoff from these areas are likely the source of these low concentrations. In the summa canister sample from SV34 collected in 2015, benzene, 1,2- bromoethane, ethylbenzene, 1,1,2-trichloroethane, and 1,1,2,2-tetrachloroethane were also detected at concentrations above the ESLs. However, surface air leakage was reported in the Summa canister (1,1-difluoroethane [1,1-DFA] was detected at a concentration of 2,700 µg/m3). As a result, soil vapor was resampled in March 2019 and December 2020 following the installation of soil vapor well SV53 in the immediate vicinity of prior sampling location SV34. No VOCs were detected above ESLs for residential land use in samples collected at SV53.

A grab groundwater sample was collected from SB28 at 38594 Cedar in the northern portion of the site, adjacent to soil vapor samples SV34 and SV53. TPH-d and TPH-mo were detected at concentrations in excess of their respective ESLs. Monitoring well MW-12 was installed in the immediate vicinity of SB28 in December 2020. TPH-g/d/mo, BTEX, and MTBE were not detected above laboratory reporting limits in the sample collected from monitoring well MW-12 in December 2020.

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Conducted to Date 18 Ramboll

4.9 Low-Threat Closure of Soil Vapor at the Site
The results of soil vapor well sampling at the site are discussed in greater detail with respect to the SWRCB Low Threat Closure Scenario 4 in Appendix C. As discussed in Appendix C, Scenario 4 of the California SWRCB Low-Threat Closure Policy was used to evaluate soil vapor data from soil vapor wells installed and sampled across the site. Scenario 4 of the SWRCB Low-Threat Closure Policy establishes low-threat soil vapor screening criteria for properties where existing or future buildings for human occupancy are planned and a bioattenuation zone can be demonstrated. The bioattenuation zone was demonstrated at all site soil vapor wells except SV47; but all VOCs were detected below residential screening criteria at SV47. The regulatory screening criteria (i.e., ESLs for residential land use) for petroleum-related VOCs was multiplied by a factor of 1,000 for sampling results at SV46, SV48 through SV50, SV51B, and SV52 through SV54.

When employing the modified ESLs for residential land use for BTEX and MTBE, the only detections above regulatory screening criteria in soil vapor samples collected from soil vapor wells SV46, SV48 through SV50, SV51B, and SV52 through SV54, are PCE and TCE in the December 2020 sample collected from SV52. PCE and TCE were not detected above laboratory reporting limits in the sample collected from SV52 in March 2019 or in the primary and duplicate samples collected in January 2021. Therefore, the detection of PCE and TCE in December 2020 is considered anomalous and not representative of site conditions.

Packet Page 2166
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Nature And Extent
of Potential Contamination 19 Ramboll

5. NATURE AND EXTENT OF POTENTIAL

CONTAMINATION
Based on the results from of environmental investigations conducted at the site to date, the following section presents a discussion of the nature and extent of the potential contamination at the site.

5.1 38288 Cedar
Detected concentrations from soil samples collected at 38288 Cedar, including samples collected from the former UST locations, at and below the depth of the former USTs, are all less than regulatory screening criteria. Soil vapor samples collected in the location of the former USTs did not detect VOC concentrations above laboratory reporting limits, and the most recent soil vapor samples collected from a semi-permanent soil vapor well installed inside the garage structure reported VOC concentrations below regulatory screening criteria.

In groundwater, VOCs have never been detected above laboratory reporting limits in samples collected from monitoring wells installed upgradient and downgradient of the former USTs at 38288 Cedar. Except for TPH-mo in a grab groundwater sample collected in the former UST location in 2019 (SB27), TPH concentrations have been below ESLs.

Based on the above results, no additional investigation or remediation is warranted at 38288 Cedar.

5.2 Former USTs at 38370 Cedar
In the location of the former USTs at 38370 Cedar, groundwater samples and soil samples collected below the groundwater table have concentrations of petroleum-related chemicals above regulatory screening criteria. However, additional monitoring wells that are located upgradient, downgradient, and cross-gradient of the former UST locations have not detected concentrations of fuel-related constituents in groundwater above regulatory screening criteria, confirming that the elevated concentrations of fuel-related constituents are localized in shallow groundwater at MW-1 and EW-1 in the location of the former USTs. In addition, soil samples collected from the top and bottom of the Newark Aquitard and a groundwater sample collected from the Newark Aquifer did not detect concentrations of petroleum-related chemicals above laboratory reporting limits. Based on these results, the horizontal and vertical extent of fuel-related constituents in soil and groundwater is limited in horizontal extent, as shown on Figure 2 and Figure 4b, and in depth to approximately 11 to 24 feet bgs in the former UST area. As discussed in Section 1, the Remedial Action Work Plan (Ramboll, 2021) is currently being implemented to specifically address the fuel-related constituents within the former UST area.

Soil vapor samples collected from soil vapor wells SV47 through SV51B in March 2019 and December 2020 only detected two chemicals above ESLs for residential land use: benzene and ethylbenzene in the March 2019 sample at SV50. With the exception of impacted soil and groundwater in the former UST area, no additional investigation or remediation is proposed at 38370 Cedar.

Packet Page 2167
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Nature And Extent
of Potential Contamination 20 Ramboll

5.3 38424 Cedar
Soil vapor well SV52, installed in the vicinity of prior sample locations SV19 and SV20, was sampled in March 2019 and December 2020. Although PCE and TCE were detected in the December 2020 sample at SV52 at concentrations above ESLs for residential land use, PCE and TCE were not detected above laboratory reporting limits in the resample or duplicate sample collected at SV52 in January 2021. Based on the resampling results, no additional investigation or remediation is warranted at 38424 Cedar.

5.4 38456 Cedar
All VOC concentrations were below ESLs in the soil vapor samples collected at 38456 Cedar.

No additional investigation or remediation is warranted.

5.5 38472, 38486, and 38592 Cedar
At these properties, the only VOC reported above ESLs in soil vapor was benzene.

However, benzene concentrations were low and likely a result of stormwater runoff from parking areas or roads. No additional investigation or remediation is warranted.

5.6 38594 Cedar
Concentrations of benzene in the 2015 soil vapor samples collected at 38594 Cedar, although above the ESL, were low and likely a result of stormwater runoff from parking areas or roads. Furthermore, a grab groundwater sample at SB28 collected at 38594 Cedar did not detect benzene.

Soil vapor sampling at SV53 in March 2019 and December 2020 did not detect any VOCs above regulatory screening criteria. Although concentrations of TPH-d and TPH-mo were detected in the grab groundwater sample from SB28 at concentrations slightly above the ESLs, TPH-g/d/mo, BTEX and MTBE were not detected above laboratory reporting limits in the sample collected from monitoring well MW-12 installed and sampled in December 2020 in the vicinity of SB28. Based on these results, no additional investigation or remediation is warranted.

Packet Page 2168
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Conclusions and Recommendations 21 Ramboll

6. CONCLUSIONS AND RECOMMENDATIONS
This section presents conclusions and recommendations for the site based on the information provided in this report.

6.1 Case Closure at 38288 Cedar
No additional investigation or remediation is warranted at 38288 Cedar. The sensitive receptor survey and well survey provided in this report are the only remaining items required for case closure to be granted at 38288 Cedar. As such, Ramboll requests No Further Action and Case Closure from ACWD for the J&M Concrete case at 38288 Cedar Boulevard in Newark, California (ACWD case no. TT0623; RWQCB case no. 01-3514).

6.2 No Further Investigation at 38370 Cedar
No further investigation or remediation of the 38370 Cedar portion of the site is warranted with the exception of the former UST area.

Remediation of petroleum in soil and groundwater in the former UST area at 38370 Cedar is being addressed in the Remedial Action Work Plan currently being implemented.

6.3 No Further Investigation or Remediation at 38424 Cedar Based on the sampling results collected to date, no further investigation or remediation is warranted at 38424 Cedar.

6.4 No Further Investigation or Remediation at 38456 Cedar Based on the sampling results collected to date, no further investigation or remediation is warranted at 38456 Cedar.

6.5 No Further Investigation or Remediation at 38472 Cedar, 38486 Cedar, and 38592 Cedar
At these properties, the only VOC reported above ESLs in soil vapor was benzene.

However, benzene concentrations were low and likely a result of stormwater runoff from parking areas or roads. Furthermore, as detailed in Appendix C and discussed in Section

4.9, soil and soil vapor sampling conducted at SV54 on the eastern portion of 38370 Cedar has demonstrated a bioattenuation zone consistent with Scenario 4 of the California SWRCB Low-Threat Closure Policy. As such, no VOCs in soil vapor samples collected from SV54 exceed the modified ESLs established by Scenario 4 of the Low-Threat Closure Policy. No additional investigation or remediation is warranted at 38472 Cedar, 38486 Cedar, and 38592 Cedar.

6.6 No Further Investigation or Remediation at 38594 Cedar The groundwater sample collected from MW-12 did not detect concentrations of TPHg/d/mo, BTEX, or MTBE above laboratory reporting limits.

The 2020 Investigation Work Plan discussed the potential installation of two contingency monitoring wells MW-13 and MW-14 at 38594 Cedar if TPHs or VOCs were detected in groundwater at MW-12. Since TPH and VOCs were not detected in MW-12, contingency wells MW-13 and MW-14 are not planned for installation.

Packet Page 2169
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Conclusions and Recommendations 22 Ramboll
No further investigation or remediation is warranted at 38594 Cedar.

6.7 No Further Investigation of Soil Vapor at the Site
Based on the results of soil vapor sampling conducted to date at site soil vapor wells, and consistent with Scenario 4 of the California SWRCB Low-Threat Closure Policy as demonstrated in Appendix C, no further investigation of soil vapor at the site outside of the former UST Area at 38370 Cedar is warranted.

6.8 No Further Investigation of Newark Aquifer
Soil samples collected from the top and bottom of the Newark Aquitard and a groundwater sample collected from the Newark Aquifer did not detect concentrations of petroleumrelated chemicals above laboratory reporting limits.

No further investigation of the Newark Aquifer is warranted.

6.9 Conclusion
With the exception of the former UST area at 38370 Cedar, all areas of potential concern identified by Ramboll and ACWD have been adequately investigated. Based on the investigation activities conducted by Ramboll at the site to date, no further investigation is warranted at the site with the exception of the former UST area at 38370 Cedar.

If ACWD is in concurrence that no further investigation or remediation is warranted at the site with the exception of the former UST area at 38370 Cedar, Ramboll requests that ACWD issue a letter authorizing unrestricted residential redevelopment of the site with the exception of the former UST area at 38370 Cedar.

Packet Page 2170
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
References 23 Ramboll

7. REFERENCES
Alameda County Water District (ACWD). 1992. Groundwater Monitoring Guidelines.

Groundwater Protection Program (GPP). September.

ACWD. 2011. Standards for the Construction, Use, Operation, Maintenance, Repair, inactivation, or Destruction of Wells, Exploratory Holes, Other Excavations, and Appurtenances. April.

California Code of Regulations (CCR). Title 22, §64444.

California State Water Resources Control Board (SWRCB) 2012. Low-Threat Underground Storage Tank Case Closure Policy. January 31.

Cal/EPA. 2011. Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (“Vapor Intrusion Guidance”). October.

Cal/EPA. 2015. Advisory on Active Soil Gas Investigations (the “Advisory”). July.

Cioco, Ramon W. 2012. Hydrostratigraphy of the Shallow Aquifer in the Niles Cone Groundwater Basin. Master’s Thesis, San Jose State University.

Duvergé, Dylan Jacques. 2011. Establishing Background Arsenic in Soil of the Urbanized San Francisco Bay Region.

Graymer, R.W. et al. 2006. Geologic Map of the San Francisco Bay Region.

ENVIRON. 2015. Work Plan for Subsurface Investigation, 38288 – 38594 Cedar Boulevard, Newark, California. June 16.

Lawrence Berkeley National Laboratory (LBNL). 2002. Analysis of Background Distribution of Metals in the Soil at LBNL. June.

Ramboll Environ. 2018. Revised Work Plan for Additional Subsurface Investigation, 38288- 38594 Cedar Boulevard, Newark, California. December 19.

Ramboll. 2020a. Site Characterization Report, Revision 1, 38288-38594 Cedar Boulevard, Newark, California. April 21.

Ramboll. 2020b. Work Plan for Additional Subsurface Investigation, 38288-38594 Cedar Boulevard, Newark, California. October 23.

Ramboll. 2021. Remedial Action Work Plan - Revision 1, 38370 Cedar Boulevard, Newark, California. March 26.

Regional Water Quality Control Board - San Francisco Bay Region (RWQCB). 2019.

Environmental Screening Levels. July, Revision 2.

Packet Page 2171
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
References 24 Ramboll
United States Environmental Protection Agency (USEPA). 2021. Regional Screening Levels for Chemical Contaminants at Superfund Sites, RSL Summary Table (TR=1E-6, HQ=1). May.

Packet Page 2172
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Ramboll

FIGURES
Packet Page 2173

SITE LOCATION MAP
PROJECT: 1690009004 | DATED: 9/20/2021 | DESIGNER: msosa LEGEND
Approximate Site Boundary
FIGURE 1
RAMBOLL US CONSULTING, INC.

A RAMBOLL COMPANY
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38288-38594 Cedar Boulevard
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Map Center: 122°0'35"W 37°31'59"N

KEY MAP
s
Packet Page 2174
Approximate Site Boundary PROPOSED SITE REDEVELOPMENT MAP Approximate Location of Impacted
Groundwater at 38370 Cedar Boulevard
FIGURE 2
RAMBOLL US CONSULTING, INC.

A RAMBOLL COMPANY
Service Layer Credits:
0 40 80
Feet
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38288-38594 Cedar Boulevard
Newark, California
Packet Page 2175

SITE LAYOUT
PROJECT: 1690019190-002 | DATED: 9/20/2021 | DESIGNER: msosa FIGURE 3
RAMBOLL US CONSULTING, INC.

A RAMBOLL COMPANY
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38288-38594 Cedar Boulevard
Newark, California
Q:\DRAWINGS\1690019190-002\1690019190-002-Samploclayout.mxd Legend
Site Boundary
Former UST Area
Packet Page 2176

SAMPLE LOCATION MAP
PROJECT: 1690009004 | DATED: 9/21/2021 | DESIGNER: msosa FIGURE 4a
RAMBOLL US CONSULTING, INC.

A RAMBOLL COMPANY
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0 60 120
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CEDAR BOULEVARD
INTERSTATE 880
38288
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38370
Cedar Blvd
38424
Cedar Blvd
38456
Cedar Blvd 38472
Cedar Blvd
38486
Cedar Blvd
38594
Cedar Blvd
38592
Cedar Blvd
EW-1
MW-10
SV48
SV50
SV51/SV51B
SV47
SV46
SV06
SV53
SB28 SV52
SV33
SV40
SB29
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SV54
MW-12
SBNA-1
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MW-7
MW-6
MW-5
MW-4
MW-3
MW-1
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SB21
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SB18
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SB12
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SV34
SV43
SV35
SV37
SV38
SV32
SV30
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SV28
SV27
SV26
SV25
SV24
SV23
SV22
SV21
SV20
SV19
SV18
SV17
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SV16
SV14
SV12
SV11
SV10
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Former UST
Excavation
B14
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B9
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2 Former Tank
Locations
Soil Boring Location
(2015 and 2020)
Legend
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Site Boundary Investigation by EBS
Soil and Grab Groundwater
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Packet Page 2177

SAMPLE LOCATION MAP

WESTERN PORTION OF SITE
PROJECT: 1690009004 | DATED: 9/28/2021 | DESIGNER: RMSO FIGURE 4b
RAMBOLL US CONSULTING, INC.

A RAMBOLL COMPANY
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38288-38594 Cedar Boulevard
Newark, California
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CEDAR BOULEVARD
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38472
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SV49
SV50
SV51/SV51B
SV52
SV48
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MW-8
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MW-4
MW-3
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SB21
SB20
SB19
SB18
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SV39
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SV23
SV22
SV21
SV20
SV19
SV18
SV17
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SV06
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SV16
SV14
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SV11
SV10
SV09
SV05
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B14
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Packet Page 2178

GROUNDWATER ELEVATION CONTOUR MAP
DECEMBER 2020
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CEDAR BOULEVARD
INTERSTATE 880
38288
Cedar Blvd
38370
Cedar Blvd
38424
Cedar Blvd
38456
Cedar Blvd
38472
Cedar Blvd

19.40 MW-11

19.23 19.30

19.20 19.40

19.30 19.20
EW-1

19.37 MW-8

19.36 MW-7

19.29 MW-1

19.34 MW-10

19.35 MW-9

19.46 MW-6

19.17 MW-5

19.37 MW-4

19.40 MW-3

19.34 PROJECT: 1690009004 | DATED: 9/20/2021 | DESIGNER: SSHI FIGURE 5
RAMBOLL US CONSULTING, INC.

A RAMBOLL COMPANY
0 40 80
Feet
!(á N
Freitas Site
38288-38594 Cedar Boulevard
Newark, California
Q:\DRAWINGS\1690009004\1690019190-003-GW map-Dec2020.mxd Legend
Groundwater
Elevation Contour,
December 2020
Ó´! Monitoring Well
Location
Groundwater Elevation
(feet above mean sea level)

19.35 Approximate Direction
of Groundwater Flow
Note:

Surveyed elevation datum =
Alameda County BM "ROB-BIR 1979"
Former UST Area
Packet Page 2179
MAP OF SENSITIVE RECEPTORS (0.25-MILE RADIUS)
PROJECT: 1690019190-003 | DATED: 9/23/2021 | DESIGNER: RMSO LEGEND
Church
Park
Residential Homes
School
Site Area
FIGURE 6
RAMBOLL US CONSULTING, INC.

A RAMBOLL COMPANY
Aerial Source: Google Earth Pro, May 2018.
0 250 500
Feet
!(
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38288 and 38370 Cedar Boulevard
Newark, California
C:\Users\rmso\OneDrive - Ramboll\Desktop\drawing1\1690019190-003\1690019190-003-38288 Cedar Blvd-Sensitive receptor.mxd Packet Page 2180

ACWD WELL SURVEY MAP
(0.25-MILE RADIUS)
!«1
!«2
!«3

CEDAR BOULEVARD
5S/1W-06C002
5S/1W-06H004
5S/1W-06H001
PROJECT: 1690019190-003 | DATED: 9/21/2021 | DESIGNER: SSHI LEGEND FIGURE 7
RAMBOLL US CONSULTING, INC.

A RAMBOLL COMPANY
Service Layer Credits: Source: Esri, Maxar, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community 0 250 500
Feet
!(á N
Freitas Site
38288-38594 Cedar Boulevard
Newark, California
Q:\DRAWINGS\1690019190-003\Figure7_Wells within Quarter Mile.mxd Notes:

1. 5S/1W-06C002, Privately Owned

2. 5S/1W-06H001, Privately Owned

3. 5S/1W-06H004, ACWD Owned
The list of wells within 0.25 miles of the site
has been provided by ACWD on May 6, 2021.

Each of the well locations shown are
approximate.

Approximate Direction of
Groundwater Flow
Site Boundary
Municipal Well Location
Agricultural Well Location
Packet Page 2181
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Ramboll
TABLES
Packet Page 2182
Table 1: Metals in Soil Samples
Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location
Sample
ID
Sample
Depth
(feet bgs)
Sample
Date Antimony Arsenic Barium Beryllium Cadmium Chromiuma Cobalt Copper Lead Mercury Molybdenum Nickel Selenium Silver Thallium Vanadium Zinc 38288 Cedar Boulevard
SB01 SB01_2.5 2.5 7/7/2015 0.69 9.3 240 0.53 ND<0.25 95 14 35 10 ND<0.050 0.73 110 ND<0.50 ND<0.50 ND<0.50 58 67 SB02 SB02_2.5 2.5 7/7/2015 ND<0.50 6.4 160 ND<0.50 ND<0.25 66 13 28 8.6 ND<0.050 0.73 73 ND<0.50 ND<0.50 ND<0.50 43 52 SB03 SB03_2.5 2.5 7/7/2015 0.54 8.6 270 0.53 ND<0.25 83 14 29 9.9 ND<0.050 ND<0.50 95 ND<0.50 ND<0.50 ND<0.50 49 57 SB04 SB04_2.5 2.5 7/7/2015 ND<0.50 8.0 250 0.51 ND<0.25 76 13 29 9.2 ND<0.050 ND<0.50 91 ND<0.50 ND<0.50 ND<0.50 47 57 SB05 SB05_2.5 2.5 7/7/2015 0.61 8.1 210 0.51 ND<0.25 75 13 29 11 0.052 1.2 89 ND<0.50 ND<0.50 ND<0.50 48 59 SB06 SB06_2.5 2.5 7/7/2015 0.64 8.4 180 ND<0.50 ND<0.25 81 13 30 9.9 ND<0.050 0.52 99 ND<0.50 ND<0.50 ND<0.50 49 61 SB07 SB07_2.5 2.5 7/7/2015 0.67 8.7 300 ND<0.50 ND<0.25 80 13 31 9.6 ND<0.050 0.57 100 ND<0.50 ND<0.50 ND<0.50 47 62 SB08 SB08_2.5 2.5 7/7/2015 0.75 9.7 300 0.58 ND<0.25 90 15 38 11 ND<0.050 0.63 110 ND<0.50 ND<0.50 ND<0.50 54 73 SB09 SB09_2.5 2.5 7/7/2015 0.74 8.8 260 0.56 ND<0.25 90 15 37 11 ND<0.050 0.53 110 ND<0.50 ND<0.50 ND<0.50 53 67 SB10 SB10_2.5 2.5 7/7/2015 0.58 6.7 220 0.51 ND<0.25 74 13 27 7.8 ND<0.050 0.50 90 ND<0.50 ND<0.50 ND<0.50 44 53 38370 Cedar Boulevard
SB11 SB11_2.5 2.5 7/7/2015 0.56 8.3 200 0.53 ND<0.25 80 14 28 8.4 ND<0.050 ND<0.50 98 ND<0.50 ND<0.50 ND<0.50 48 51 SB12 SB12_2.5 2.5 7/7/2015 ND<0.50 5.6 120 ND<0.50 ND<0.25 59 11 30 16 0.11 0.61 72 ND<0.50 ND<0.50 ND<0.50 43 63 SB13 SB13_2.5 2.5 7/7/2015 ND<0.50 5.6 180 ND<0.50 ND<0.25 65 12 27 13 ND<0.050 ND<0.50 74 ND<0.50 ND<0.50 ND<0.50 42 61 SB14 SB14_2.5 2.5 7/7/2015 ND<0.50 5.4 110 ND<0.50 ND<0.25 64 16 40 6.0 ND<0.050 0.70 71 ND<0.50 ND<0.50 ND<0.50 78 56 SB15 SB15_2.5 2.5 7/7/2015 ND<0.50 6.8 170 ND<0.50 ND<0.25 71 14 33 8.2 ND<0.050 0.86 81 ND<0.50 ND<0.50 ND<0.50 62 57 SB16 SB16_2.5 2.5 7/7/2015 0.55 8.6 180 0.54 ND<0.25 83 14 32 9.1 ND<0.050 0.54 95 ND<0.50 ND<0.50 ND<0.50 55 58 SB17 SB17_2.5 2.5 7/7/2015 0.65 8.6 230 0.54 ND<0.25 82 14 32 10 ND<0.050 0.54 100 ND<0.50 ND<0.50 ND<0.50 52 67 SB18 SB18_2.5 2.5 7/7/2015 0.57 7.5 280 0.55 ND<0.25 83 13 32 9.0 ND<0.050 0.53 99 ND<0.50 ND<0.50 ND<0.50 52 59 SB19 SB19_2.5 2.5 7/7/2015 0.71 9.4 180 0.59 ND<0.25 88 14 33 10 0.054 0.69 110 ND<0.50 ND<0.50 ND<0.50 52 65 38424 Cedar Boulevard
SB22 SB22_2.5 2.5 7/9/2015 0.65 5.8 210 ND<0.50 ND<0.25 69 12 28 15 ND<0.050 0.55 81 ND<0.50 ND<0.50 ND<0.50 44 60 SB23 SB23_2.5 2.5 7/9/2015 0.54 5.3 170 ND<0.50 ND<0.25 59 11 28 11 ND<0.050 0.50 68 ND<0.50 ND<0.50 ND<0.50 47 56 SB24 SB24_2.5 2.5 7/9/2015 ND<0.50 7.4 200 0.54 ND<0.25 78 13 30 8.9 ND<0.050 ND<0.50 98 ND<0.50 ND<0.50 ND<0.50 44 58 SB25 SB25_2.5 2.5 7/9/2015 0.61 7.8 200 0.56 ND<0.25 73 13 30 8.3 ND<0.050 0.66 88 ND<0.50 ND<0.50 ND<0.50 46 54 38594 Cedar Boulevard
SB26 SB26_2.5 2.5 7/10/2015 ND<0.50 7.7 250 0.51 ND<0.25 76 13 31 9.1 ND<0.050 ND<0.5 98 ND<0.50 ND<0.50 ND<0.50 44 60 11 11 [2] 15,000 16 78 12,000 23 3,100 80 13 390 820 390 390 0.78 390 23,000 Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

All data are reported in milligrams per kilogram (mg/kg).

California Assessment Manual 17 (CAM17) metals analyzed by EPA Method 6020. a
Samples were analyzed for total chromium. Results are compared against screening levels for chromium III.

Screening Value from San Francisco Bay RWQCB ESL
for Residential Land Use [1]

Page 1 of 14 ends

Packet Page 2183
Table 2: Organochlorine Pesticides Detected in Soil Samples* Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location Sample ID
Sample Depth
(feet bgs)
Sample
Date p,p-DDD p,p-DDE p,p-DDT
38288 Cedar Boulevard
SB01 SB01_2.5 2.5 7/7/2015 ND<0.0050 ND<0.0050 ND<0.0050 SB02 SB02_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB03 SB03_2.5 2.5 7/7/2015 ND<0.0050 ND<0.0050 0.0093
SB04 SB04_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB05 SB05_2.5 2.5 7/7/2015 ND<0.0010 0.0014 ND<0.0010
SB06 SB06_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB07 SB07_2.5 2.5 7/7/2015 ND<0.050 ND<0.050 ND<0.050
SB08 SB08_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB09 SB09_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB10 SB10_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 38370 Cedar Boulevard
SB11 SB11_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB12 SB12_2.5 2.5 7/7/2015 ND<0.10 ND<0.10 ND<0.10
SB13 SB13_2.5 2.5 7/7/2015 ND<0.0010 0.014 ND<0.0010
SB14 SB14_2.5 2.5 7/7/2015 ND<0.020 ND<0.020 ND<0.020
SB15 SB15_2.5 2.5 7/7/2015 ND<0.020 ND<0.020 ND<0.020
SB16 SB16_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB17 SB17_2.5 2.5 7/7/2015 ND<0.0050 ND<0.0050 ND<0.0050 SB18 SB18_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB19 SB19_2.5 2.5 7/7/2015 ND<0.0010 ND<0.0010 ND<0.0010 38424 Cedar Boulevard
SB22 SB22_2.5 2.5 7/9/2015 0.013 0.020 ND<0.0050
SB23 SB23_2.5 2.5 7/9/2015 0.0068 0.023 0.0079
SB24 SB24_2.5 2.5 7/9/2015 ND<0.0010 ND<0.0010 ND<0.0010 SB25 SB25_2.5 2.5 7/9/2015 ND<0.0010 ND<0.0010 ND<0.0010 38594 Cedar Boulevard
SB26 SB26_2.5 2.5 7/10/2015 ND<0.0010 ND<0.0010 ND<0.0010

2.7 1.8 1.9
Notes:

All data are reported in milligrams per kilogram (mg/kg).

Organochlorine pesticides (OCPs) analyzed by EPA Method 8081A.

Residential: Shallow Soil Exposure. January 2019.

Page 2 of 14 ends

Packet Page 2184
Table 3: Total Petroleum Hydrocarbons in Soil Samples
Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location Sample ID
Sample Depth
(feet bgs)
Sample
Date TPH(g) TPH(d) TPH(mo)
38288 Cedar Boulevard
SB01 SB01_2.5 2.5 7/7/2015 ND<1.0 2.6 20
SB02 SB02_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB03 SB03_2.5 2.5 7/7/2015 ND<1.0 1.4 10
SB04 SB04_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 8.6
SB05 SB05_2.5 2.5 7/7/2015 ND<1.0 3.2 14
SB06 SB06_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB07 SB07_2.5 2.5 7/7/2015 ND<1.0 7.7 120
SB08 SB08_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB09 SB09_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB10 SB10_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB27 SB27_9.0 9.0 1/16/2019 ND<1.0 ND<1.0 ND<5.0
SB27 SB27_14.5 14.5 1/16/2019 ND<1.0 ND<1.0 ND<5.0
SB29 SB29-4.0 4.0 12/16/2020 ND<1.0 ND<1.0 NA
MW-8 MW-8_8.5 8.5 7/8/2015 ND<1.0 ND<1.0 ND<5.0
MW-8 MW-8_12.0 12 7/8/2015 ND<1.0 ND<1.0 ND<5.0
MW-9 MW-9_9.0 9 7/8/2015 ND<1.0 ND<1.0 ND<5.0
MW-9 MW-9_12.0 12 7/8/2015 ND<1.0 ND<1.0 ND<5.0
SV06 SV06_11.5 11.5 7/8/2015 ND<1.0 ND<1.0 ND<5.0
38370 Cedar Boulevard
SB11 SB11_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB12 SB12_2.5 2.5 7/7/2015 2.7 170 290
SB13 SB13_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB14 SB14_2.5 2.5 7/7/2015 ND<1.0 15 60
SB15 SB15_2.5 2.5 7/7/2015 ND<1.0 27 150
SB16 SB16_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 5.2
SB17 SB17_2.5 2.5 7/7/2015 ND<1.0 17 51
SB18 SB18_2.5 2.5 7/7/2015 ND<1.0 2.0 ND<5.0
SB19 SB19_2.5 2.5 7/7/2015 ND<1.0 ND<1.0 ND<5.0
SB20 SB20_8.5 8.5 7/9/2015 57 140 72
SB20 SB20_11.0 11 7/9/2015 ND<1.0 ND<1.0 ND<5.0
SB20 SB20_13.5 13.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
SB20 SB20_16.0 16 7/9/2015 ND<1.0 ND<1.0 ND<5.0
SB21 SB21_11.0 11 7/9/2015 93 320 160
SB21 SB21_13.0 13 7/9/2015 31 25 32
SB21 SB21_16.0 16 7/9/2015 180 240 110
SB21 SB21_19.0 19 7/9/2015 24 31 30
SBNA-1 SBNA-1-35.0 35 12/15/2020 ND<1.0 ND<1.0 ND<5.0
SBNA-1 SBNA-1-55.0 55 12/15/2020 ND<1.0 ND<1.0 ND<5.0
SV51B SV51B-4.0 4 12/16/2020 ND<1.0 ND<1.0 NA
EW-1 EW-1_9.0 9 1/17/2019 16 61 22
EW-1 EW-1_11.0 11 1/17/2019 3 2.0 ND<5.0
EW-1 EW-1_24.0 24 1/17/2019 1,100 60 ND<5.0
EW-1 EW-1_30.0 30 1/17/2019 2.7 1.5 ND<5.0
EW-1 EW-1_35.0 35 1/17/2019 ND<1.0 1.5 ND<5.0
MW-4 MW-4_8.0 8 7/10/2015 ND<1.0 ND<1.0 ND<5.0
MW-4 MW-4_12.0 12 7/10/2015 ND<1.0 ND<1.0 ND<5.0
MW-4 MW-4_17.0 17 7/10/2015 47 40 13
MW-4 MW-4_18.5 18.5 7/10/2015 48 43 22
MW-5 MW-5_11.5 11.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-5 MW-5_15.0 15 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-5 MW-5_18.5 18.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-6 MW-6_9.0 9 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-6 MW-6_12.5 12.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-7 MW-7_9.0 9 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-7 MW-7_12.0 12 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-7 MW-7_15.5 15.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
MW-10 MW-10_9.0 9 1/16/2019 ND<1.0 ND<1.0 ND<5.0
MW-10 MW-10_12.0 12 1/16/2019 ND<1.0 ND<1.0 ND<5.0
430 260 12,000 Screening Value from San Francisco Bay RWQCB ESL for Residential Land Use [1]

Page 3 of 14 ends

Packet Page 2185
Table 3: Total Petroleum Hydrocarbons in Soil Samples
Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location Sample ID
Sample Depth
(feet bgs)
Sample
Date TPH(g) TPH(d) TPH(mo)
38424 Cedar Boulevard
SB22 SB22_2.5 2.5 7/9/2015 ND<1.0 6.6 16
SB23 SB23_2.5 2.5 7/9/2015 ND<1.0 1.7 11
SB24 SB24_2.5 2.5 7/9/2015 ND<1.0 ND<1.0 ND<5.0
SB25 SB25_2.5 2.5 7/9/2015 ND<1.0 1.8 ND<5.0
38486 Cedar Boulevard
SV54 SV54-4.0 4.0 12/16/2020 ND<1.0 ND<1.0 NA
38594 Cedar Boulevard
SB26 SB26_2.5 2.5 7/10/2015 ND<1.0 ND<1.0 ND<5.0
SB28 SB28_9.5 9.5 1/15/2019 ND<1.0 ND<1.0 ND<5.0
MW12 MW-12-4.0 4.0 12/14/2020 ND<1.0 6.0 NA
B4 B4-6.0 6 11/1/2007 ND<0.22 110 NA
B4 B4-12.0 12 11/1/2007 240 110 NA
B5 B5-7.0 7 11/1/2007 ND<0.22 1.1 NA
B5 B5-10.0 10 11/1/2007 ND<0.23 ND<0.99 NA
B5 B5-20.0 20 11/1/2007 ND<0.23 ND<0.99 NA
B6 B6-7.0 7 11/2/2007 ND<0.22 4.6 NA
B6 B6-12.0 12 11/2/2007 ND<0.24 ND<0.99 NA
B6 B6-16.0 16 11/2/2007 4.3 ND<1.0 NA
B7 B7-8.0 8 11/2/2007 ND<0.24 ND<0.99 NA
B7 B7-10.5 10.5 11/2/2007 ND<0.24 21 NA
B7 B7-16.0 16 11/2/2007 3.7 ND<0.99 NA
B8 B8-8.0 8 11/2/2007 6.6 30 NA
B8 B8-12.0 12 11/2/2007 ND<0.23 ND<0.99 NA
B9 B9-8.0 8 11/2/2007 0.32 87 NA
B9 B9-11.0 11 11/2/2007 0.88 44 NA
B12 B12-8.0 8 11/2/2007 0.38 49 NA
B12 B12-12.0 12 11/2/2007 ND<0.25 ND<0.99 NA
SB1 SB1 15 3/5/2001 ND ND NA
SB2 SB2 15 3/5/2001 ND ND NA
SB3 SB3 15 3/5/2001 200 330 NA
MW1 MW1 15 3/5/2001 250 88 NA
MW2 MW2 10 3/5/2001 ND ND NA
MW3 MW3 10 3/5/2001 ND ND NA
430 260 12,000
Notes:

All data are reported in milligrams per kilogram (mg/kg).

Blue shading denotes detection above screening value.

Residential: Shallow Soil Exposure. July 2019.

Historical Soil Samples Collected at the Site
Only compounds detected above the laboratory reporting limit are included in the table and are shown in bold.

Screening Value from San Francisco Bay RWQCB ESL
for Residential Land Use [1]

Page 4 of 14 ends

Packet Page 2186
Table 4: Volatile Organic Compounds in Soil Samples
Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location Sample ID
Sample
Depth
(feet bgs)
Sample
Date Benzene
n-Butyl
benzene
sec-Butyl
benzene
tert-Butyl
benzene Ethylbenzene Isopropylbenzene Naphthalene
n-Propyl
benzene Toluene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene m,p-Xylene o-Xylene Xylenes,
Total
38288 Cedar Boulevard
SB27 SB27_9.0 9 1/16/2019 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 SB27 SB27_14.5 14.5 1/16/2019 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 38370 Cedar Boulevard
EW-1 EW-1_9.0 9 1/17/2019 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 EW-1 EW-1_11.0 11 1/17/2019 ND<0.0079 0.0085 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 EW-1 EW-1_24.0 24 1/17/2019 2.9 2.7 ND<0.81 ND<0.81 8.2 0.99 3.2 3.6 1.3 19 5.9 15 5.7 21 EW-1 EW-1_30.0 30 1/17/2019 0.011 0.012 ND<0.0050 ND<0.0050 0.017 ND<0.0050 0.0087 0.012 ND<0.0050 0.073 0.022 0.038 0.015 0.053 EW-1 EW-1_35.0 35 1/17/2019 0.0098 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 ND<0.0050 MW-4 MW-4_8.0 8 7/10/2015 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 ND<0.0079 NA NA ND<0.0079 MW-4 MW-4_12.0 12 7/10/2015 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 ND<0.0086 NA NA ND<0.0086 MW-4 MW-4_17.0 17 7/10/2015 ND<0.034 0.22 0.10 0.045 ND<0.034 ND<0.034 ND<0.034 ND<0.034 ND<0.034 ND<0.034 ND<0.034 NA NA ND<0.034 MW-4 MW-4_18.5 18.5 7/10/2015 ND<0.036 0.22 0.13 0.051 ND<0.036 ND<0.036 ND<0.036 ND<0.036 ND<0.036 ND<0.036 ND<0.036 NA NA ND<0.036 MW-6 MW-6_9.0 9 7/9/2015 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 ND<0.008 NA NA ND<0.008 MW-6 MW-6_12.5 12.5 7/9/2015 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 ND<0.0088 NA NA ND<0.0088 MW-10 MW-10_9.0 9 1/16/2019 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 MW-10 MW-10_12.0 12 1/16/2019 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 ND<0.010 SB14 SB14_2.5 2.5 7/10/2015 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 NA NA ND<0.0076 SB15 SB15_2.5 2.5 7/10/2015 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 NA NA ND<0.0082 SB20 SB20_8.5 8.5 7/9/2015 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 ND<0.0075 NA NA ND<0.0075 SB20 SB20_11.0 11 7/9/2015 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 ND<0.0076 NA NA ND<0.0076 SB20 SB20_13.5 13.5 7/9/2015 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 ND<0.0082 NA NA ND<0.0082 SB20 SB20_16.0 16 7/9/2015 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 ND<0.0078 NA NA ND<0.0078 SB21 SB21_11.0 11 7/9/2015 ND<0.077 0.18 0.093 ND<0.077 ND<0.077 ND<0.077 ND<0.077 ND<0.077 ND<0.077 ND<0.077 ND<0.077 NA NA ND<0.077 SB21 SB21_13.0 13 7/9/2015 ND<0.0075 0.076 0.030 0.013 ND<0.0075 0.021 ND<0.0075 0.086 ND<0.0075 ND<0.0075 ND<0.0075 NA NA ND<0.0075 SB21 SB21_16.0 16 7/9/2015 0.36 0.17 0.063 ND<0.051 ND<0.051 0.12 ND<0.051 0.32 ND<0.051 ND<0.051 ND<0.051 NA NA ND<0.051 SB21 SB21_19.0 19 7/9/2015 2.5 ND<0.032 ND<0.032 ND<0.032 0.054 ND<0.032 0.07 ND<0.032 ND<0.032 ND<0.032 ND<0.032 NA NA 0.048 SBNA-1 SBNA-1-35.0 35 12/15/2020 ND<0.010 NA NA NA ND<0.010 NA NA NA ND<0.010 NA NA ND<0.010 ND<0.010 ND<0.010 SBNA-1 SBNA-1-55.0 55 12/15/2020 ND<0.010 NA NA NA ND<0.010 NA NA NA ND<0.010 NA NA ND<0.010 ND<0.010 ND<0.010 38594 Cedar Boulevard
SB28 SB28_9.5 9.5 1/15/2019 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085 ND<0.0085

5.9 -- 3.8 -- 1,100 -- -- -- -- 580 Screening Value from San Francisco Bay RWQCB ESL for Residential Land Use [1] 0.33 -- -- --

Page 5 of 14 ends

Packet Page 2187
Table 4: Volatile Organic Compounds in Soil Samples
Results of Soil Sampling
38288-38594 Cedar Boulevard, Newark, California
Sample
Location Sample ID
Sample
Depth
(feet bgs)
Sample
Date Benzene
n-Butyl
benzene
sec-Butyl
benzene
tert-Butyl
benzene Ethylbenzene Isopropylbenzene Naphthalene
n-Propyl
benzene Toluene 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene m,p-Xylene o-Xylene Xylenes,
Total
B4 B4-6.0 6 11/1/2007 ND<0.0044 NA NA NA ND<0.0044 NA NA NA ND<0.0044 NA NA NA NA ND<0.0088 B4 B4-12.0 12 11/1/2007 ND<0.91 NA NA NA ND<0.91 NA NA NA ND<0.91 NA NA NA NA ND<1.8 B5 B5-7.0 7 11/1/2007 ND<0.0045 NA NA NA ND<0.0045 NA NA NA ND<0.0045 NA NA NA NA ND<0.0089 B5 B5-10.0 10 11/1/2007 ND<0.0047 NA NA NA ND<0.0047 NA NA NA ND<0.0047 NA NA NA NA ND<0.0094 B5 B5-20.0 20 11/1/2007 ND<0.0046 NA NA NA ND<0.0046 NA NA NA ND<0.0046 NA NA NA NA ND<0.0091 B6 B6-7.0 7 11/2/2007 ND<0.0045 NA NA NA ND<0.0045 NA NA NA ND<0.0045 NA NA NA NA ND<0.0089 B6 B6-12.0 12 11/2/2007 ND<0.0048 NA NA NA ND<0.0048 NA NA NA ND<0.0048 NA NA NA NA ND<0.0096 B6 B6-16.0 16 11/2/2007 ND<0.0047 NA NA NA ND<0.0047 NA NA NA ND<0.0047 NA NA NA NA ND<0.0094 B7 B7-8.0 8 11/2/2007 ND<0.0049 NA NA NA ND<0.0049 NA NA NA ND<0.0049 NA NA NA NA ND<0.0097 B7 B7-10.5 11 11/2/2007 ND<0.0048 NA NA NA ND<0.0048 NA NA NA ND<0.0048 NA NA NA NA ND<0.0096 B7 B7-16.0 16 11/2/2007 ND<0.0048 NA NA NA ND<0.0048 NA NA NA ND<0.0048 NA NA NA NA ND<0.0095 B8 B8-8.0 8 11/2/2007 ND<0.0050 NA NA NA ND<0.0050 NA NA NA ND<0.0050 NA NA NA NA ND<0.024 B8 B8-12.0 12 11/2/2007 ND<0.0046 NA NA NA ND<0.0046 NA NA NA ND<0.0046 NA NA NA NA ND<0.0092 B9 B9-8.0 8 11/2/2007 ND<0.0048 NA NA NA ND<0.0048 NA NA NA ND<0.0048 NA NA NA NA ND<0.0095 B9 B9-11.0 11 11/2/2007 ND<0.0047 NA NA NA ND<0.0047 NA NA NA ND<0.0047 NA NA NA NA ND<0.0094 B12 B12-8.0 8 11/2/2007 ND<0.0049 NA NA NA ND<0.0049 NA NA NA ND<0.0049 NA NA NA NA ND<0.0098 B12 B12-12.0 12 11/2/2007 ND<0.0050 NA NA NA ND<0.0050 NA NA NA ND<0.0050 NA NA NA NA ND<0.010 SB1 SB1 15 3/5/2001 ND NA NA NA 0.005 NA NA NA ND NA NA NA NA ND SB2 SB2 15 3/5/2001 ND NA NA NA ND NA NA NA ND NA NA NA NA ND SB3 SB3 15 3/5/2001 0.72 NA NA NA 3.3 NA NA NA 0.84 NA NA NA NA 1.1 MW1 MW1 15 3/5/2001 0.87 NA NA NA 5.6 NA NA NA 0.99 NA NA NA NA 6.9 MW2 MW2 10 3/5/2001 ND NA NA NA ND NA NA NA ND NA NA NA NA ND MW3 MW3 10 3/5/2001 ND NA NA NA ND NA NA NA ND NA NA NA NA ND Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

All data are reported in milligrams per kilogram (mg/kg).

0.33 -- -- -- 5.9 -- 3.8 -- 1,100 -- -- -- -- 580
[1] Environmental Screening Levels. San Francisco Bay Regional Water Quality Control Board. Residential: Shallow Soil Exposure. July 2019.

Screening Value from San Francisco Bay RWQCB ESL for
Residential Land Use [1]
Historical Soil Samples Collected at the Site

Page 6 of 14 ends

Packet Page 2188
Table 5: Volatile Organic Compounds in Soil Vapor Samples Results of Soil Vapor Sampling
38288-38594 Cedar Boulevard, Newark, California
Location Sample ID
Sample
Date
TPH
(gasoline
range) Acetone Benzene 2-Butanone
Carbon
Disulfide Chlorobenzene Chloroethane Chloroform Chloromethane Dichlorodifluoro
methane 1,1-Dichloroethane 1,1-Dichloroethene 1,2-Dibromoethane 1,3-Dichlorobenzene 1,4-Dichlorobenzene c-1,2-
Dichloroethene Ethanol Ethylbenzene 4-Ethyltoluene 2-Hexanone Methyl-t-Butyl
Ether (MTBE) o-Xylene p/m-Xylene
38288 Cedar Boulevard
SV01 SV01 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA ND<100 ND<200 SV02 SV02 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA ND<100 ND<200 SV03 SV03 7/8/2015 ND<10,000 NA 160 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA ND<100 ND<200 SV04 SV04 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA ND<100 ND<200 SV05 SV05 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA ND<100 ND<200 SV06 SV06 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA ND<100 ND<200 SV39 SV39 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV40 SV40 7/10/2015 18,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA 120 330 SV46 [a] SV46-20190318 3/18/2019 NA 12 ND<1.6 ND<4.4 28 ND<2.3 ND<1.3 3.8 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 ND<9.4 ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV46 [a] SV46-20201218 12/18/2020 NA 12 ND<1.6 ND<4.4 ND<6.2 ND<2.3 ND<1.3 ND<2.4 ND<1.0 2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 NA ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 38370 Cedar Boulevard
SV07 SV07 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA 340 1,000 SV08 SV08 7/8/2015 46,000 NA 130 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA 1,800 5,600 SV09 SV09 7/8/2015 3,700,000 NA 350 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA 200 1,500 SV10 SV10 7/8/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA ND<100 ND<200 SV11 SV11 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA ND<100 ND<200 SV12 SV12 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA NA NA NA NA NA NA ND<100 ND<200 SV13 SV13 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS SV14 SV14 7/9/2015 84,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA 7,700 22,000 SV14 [a] SV14_Summa 7/9/2015 NA 220 ND<53 ND<150 ND<210 ND<77 ND<44 ND<81 ND<34 ND<82 ND<67 ND<66 ND<130 ND<100 ND<100 ND<66 NA 100 ND<82 ND<200 ND<240 160 410 SV15 SV15 7/9/2015 790,000 NA 150 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA 93,000 250,000 SV15 [a] SV15_Summa 7/9/2015 NA 9,600 67 320 ND<31 ND<12 ND<6.6 ND<12 ND<5.2 ND<12 ND<10 ND<9.9 ND<19 ND<15 ND<15 ND<9.9 NA 5,100 1,100 ND<31 ND<36 7,600 19,000 SV16 SV16 7/9/2015 43,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA 3,500 8,700 SV17 SV17 7/9/2015 390,000 NA 90 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA 41,000 110,000 SV47 [a] SV47-20190318 3/18/2019 NA ND<11 ND<3.8 ND<10 ND<15 ND<5.5 ND<3.1 ND<5.8 ND<2.4 ND<5.9 ND<4.8 ND<4.7 ND<9.1 ND<7.1 ND<7.1 ND<4.7 ND<22 ND<5.1 ND<5.8 ND<15 26 ND<5.1 ND<21 SV47 [a] SV47-20201217 12/17/2020 NA ND<11.0 ND<3.6 ND<9.9 ND<14.0 ND<5.2 ND<3.0 ND<5.5 ND<2.3 ND<5.5 ND<4.5 ND<4.4 ND<8.6 ND<6.7 ND<6.7 ND<4.4 NA ND<4.9 ND<5.5 ND<14.0 60 ND<4.9 ND<19.0 SV48 [a] SV48-20190318 3/18/2019 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SV48 [a] SV48-20201217 12/17/2020 NA ND<11.0 ND<3.8 ND<11.0 ND<15.0 ND<5.5 ND<3.1 ND<5.8 ND<2.5 ND<5.9 ND<4.8 ND<4.7 ND<9.1 ND<7.2 ND<7.2 ND<4.7 NA ND<5.2 ND<5.9 ND<15.0 ND<17.0 ND<5.2 ND<21.0 SV49 [a] SV49-20190315 3/15/2019 NA 24 ND<1.6 ND<4.4 14 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 ND<9.4 ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV49 [a] SV49-20201218 12/18/2020 NA 30 ND<1.6 4.5 ND<6.2 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 NA ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV50 [a] SV50-20190315 3/15/2019 NA ND<4.8 940 ND<4.4 26 ND<2.3 ND<1.3 3.5 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 ND<9.4 200 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV50 [a] SV50-20201218 12/18/2020 NA 6.2 ND<1.6 ND<4.4 ND<6.2 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 NA ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV51 [a] SV51-20190318 3/18/2019 NA 15 ND<1.6 ND<4.4 ND<6.2 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 ND<9.4 ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV51B [a] SV51B-20201218 12/18/2020 NA ND<13.0 ND<4.3 ND<12.0 ND<17.0 ND<6.2 ND<3.6 ND<6.6 ND<2.8 ND<6.7 ND<5.5 ND<5.4 ND<10.0 ND<8.1 ND<8.1 ND<5.4 NA 7.7 15 ND<17.0 ND<20.0 16 25 38424 Cedar Boulevard
SV18 SV18 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV19 SV19 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV19 [a] SV19_Summa 7/9/2015 NA 1,500 170 ND<220 ND<310 ND<120 ND<66 ND<120 53 ND<120 ND<100 ND<99 ND<190 ND<150 ND<150 ND<99 NA 1,100 130 ND<310 ND<360 340 1,500 SV20 SV20 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV20 [a] SV20_Summa 7/9/2015 NA 840 6.1 43 12 ND<2.4 ND<1.4 ND<2.5 3.5 ND<2.6 ND<2.1 ND<2.1 ND<4.0 ND<3.1 ND<3.1 ND<2.1 NA 4.3 ND<2.6 ND<6.4 ND<7.5 3.2 ND<9.0 SV21 SV21 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV22 SV22 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV52 [a] SV52-20190318 3/18/2019 NA 15 ND<1.6 ND<4.4 ND<6.2 ND<2.3 ND<1.3 2.7 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 ND<9.4 ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV52 [a] SV52-20201217 12/17/2020 NA 12 ND<1.6 ND<4.4 ND<6.2 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 7.9 NA ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV52 [a] SV52-20210120 1/20/2021 NA 11 ND<1.6 ND<4.4 ND<6.2 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 NA ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV52 [a] SV152-20210120 1/20/2021 NA 11 ND<1.6 ND<4.4 ND<6.2 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 NA ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 38456 Cedar Boulevard
SV23 SV23 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV24 SV24 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV25 SV25 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 230 SV26 SV26 7/9/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA 180 490 38472 Cedar Boulevard
SV27 SV27 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV28 SV28 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA 380 800 SV29 SV29 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV30 SV30 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV30 [a] SV30_Summa 7/9/2015 NA 2,100 14 56 23 ND<4.6 ND<2.6 ND<4.9 14 ND<4.9 ND<4.0 ND<4.0 ND<7.7 ND<6.0 ND<6.0 ND<4.0 NA 5.2 ND<4.9 ND<12 ND<14 4.6 ND<17 38486 Cedar Boulevard
SV31 SV31 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV32 SV32 7/10/2015 ND<10,000 NA 83 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV32 [a] SV32_Summa 7/9/2015 NA 130 46 27 32 ND<3.0 2.1 ND<3.2 9.2 ND<3.3 ND<2.7 ND<2.6 ND<5.1 ND<4.0 ND<4.0 ND<2.6 NA 15 3.8 ND<8.1 ND<9.5 13 31 SV41 [a] SV41_Summa 7/16/2015 NA 140 ND<4.1 20 ND<16 ND<5.9 ND<3.4 ND<6.2 ND<2.6 ND<6.3 ND<5.2 ND<5.1 ND<9.8 ND<7.7 ND<7.7 ND<5.1 ND<24 ND<5.6 ND<6.3 ND<16 ND<18 ND<5.6 ND<22 SV54 [a] SV54-20201217 12/17/2020 NA 48 23 9.0 19 ND<2.3 ND<1.3 6.3 ND<1.0 3.2 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 2.0 NA 7.9 ND<2.5 ND<6.1 ND<7.2 11 26 SV54 [a] SV154-20201217 12/17/2020 NA 40 20 8.7 15 ND<2.3 ND<1.3 5.7 ND<1.0 3.7 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 NA 7.1 ND<2.5 ND<6.1 ND<7.2 10 24 38592 Cedar Boulevard
SV33 [a] SV33_Summa 7/16/2015 NA 570 29 89 66 ND<4.6 3.1 ND<4.9 12 ND<4.9 ND<4.0 7.5 ND<7.7 ND<6.0 ND<6.0 ND<4.0 ND<19 16 ND<4.9 15 ND<14 22 52 SV37 SV37 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV38 SV38 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV42 [a] SV42_Summa 7/16/2015 NA 270 30 94 41 ND<7.0 ND<4.0 ND<7.4 5.7 ND<7.5 ND<6.1 ND<6.0 ND<12 ND<9.1 ND<9.1 ND<6.0 ND<29 ND<6.6 ND<7.4 ND<19 ND<22 ND<6.6 ND<26 38594 Cedar Boulevard
SV34 SV34 7/10/2015 32,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA 350 790 SV34 [a] SV34_Summa 7/9/2015 NA 900 21 110 13 8.4 2.9 ND<3.1 7.1 ND<3.2 ND<2.6 ND<2.5 8.2 8.0 7.8 ND<2.5 NA 130 200 ND<7.9 ND<9.2 220 500 SV35 SV35 7/10/2015 ND<10,000 NA ND<80 NA NA NA ND<100 ND<100 NA NA ND<100 ND<100 ND<100 NA NA ND<100 NA NA NA NA NA ND<100 ND<200 SV36 [a] SV36_Summa 7/16/2015 NA 220 ND<3.2 18 ND<12 ND<4.6 ND<2.6 ND<4.9 ND<2.1 ND<4.9 ND<4.0 ND<4.0 ND<7.7 ND<6.0 ND<6.0 ND<4.0 ND<19 ND<4.3 ND<4.9 ND<12 ND<14 ND<4.3 ND<17 SV43 [a] SV43_Summa 7/16/2015 NA 200 18 37 2,100 ND<9.6 ND<5.5 ND<10 ND<4.3 ND<10 ND<8.4 ND<8.3 ND<16 ND<13 ND<13 ND<8.3 ND<39 ND<9.1 ND<10 ND<26 ND<30 13 ND<36 SV44 [a] SV44_Summa 7/16/2015 NA 290 4.5 47 ND<12 ND<4.6 ND<2.6 ND<4.9 3.1 ND<4.9 ND<4.0 ND<4.0 ND<7.7 ND<6.0 ND<6.0 ND<4.0 33 ND<4.3 ND<4.9 ND<12 ND<14 ND<4.3 ND<17 SV45 [a] SV45_Summa 7/16/2015 NA 110 12 23 15 ND<3.0 ND<1.7 ND<3.2 2.1 ND<3.3 ND<2.6 ND<5.1 ND<18 ND<4.0 ND<3.0 ND<2.6 ND<3.2 6.8 ND<9.5 ND<8.1 ND<7.2 11 24 SV53 [a] SV53-20190315 3/15/2019 NA ND<4.8 ND<1.6 ND<4.4 18 ND<2.3 ND<1.3 ND<2.4 ND<1.0 ND<2.5 ND<2.0 ND<2.0 ND<3.8 ND<3.0 ND<3.0 ND<2.0 ND<9.4 ND<2.2 ND<2.5 ND<6.1 ND<7.2 ND<2.2 ND<8.7 SV53 [a] SV53-20201217 12/17/2020 NA 16 ND<3.8 ND<11.0 ND<15.0 ND<5.5 ND<3.1 ND<5.8 ND<2.5 ND<5.9 ND<4.8 ND<4.7 ND<9.1 ND<7.2 ND<7.2 ND<4.7 NA ND<5.2 ND<5.9 ND<15.0 ND<17.0 ND<5.2 ND<21.0 20,000 1,000,000 3.2 170,000 -- 1,700 350,000 4.1 3,100 -- 58 2,400 0.16 -- 8.5 280 -- 37 -- -- 360 3,500 3,500 Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

All data are reported in micrograms per cubic meter (µg/m3).

Blue shading denotes detection above screening value.

Mobile lab samples analyzed by EPA Method 8260B.
[a] Summa canister sample analyzed by EPA Method TO-15.

Oxygen + Argon analyzed as a fixed gas by ASTM 1946.

Screening Value from San Francisco Bay RWQCB
ESL for Residential Land Use [1]

Page 7 of 14 ends

Packet Page 2189
Table 5: Volatile Organic Compounds in Soil Gas Samples Results of Soil Gas Sampling
38288-38594 Cedar Boulevard, Newark, California
Location Sample ID
Sample
Date Styrene Tetrachloroethene Toluene Trichloroethene
Trichlorofluoro
methane 1,1,1-Trichloroethane 1,1,2-Trichloroethane 1,3,5-Trimethylbenzene 1,1,2,2-Tetrachloroethane 1,2,4-Trimethylbenzene Vinyl Acetate 1,1-Difluoroethane
(Leak Check
Compound) Isopropanol Naphthalene Oxygen+Argon
38288 Cedar Boulevard
SV01 SV01 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV02 SV02 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV03 SV03 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV04 SV04 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA 120 NA SV05 SV05 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV06 SV06 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV39 SV39 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 210 NA ND<10,000 NA ND<70 NA SV40 SV40 7/10/2015 NA ND<100 980 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV46 [a] SV46-20190318 3/18/2019 ND<6.4 ND<3.4 ND<1.9 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA NA SV46 SV46-20201218 12/18/2020 ND<6.4 ND<3.4 ND<1.9 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 28 ND<6.6 7.8% 38370 Cedar Boulevard
SV07 SV07 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV08 SV08 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 100 NA ND<10,000 NA ND<70 NA SV09 SV09 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 370 ND<100 1,600 NA ND<10,000 NA 210 NA SV10 SV10 7/8/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV11 SV11 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV12 SV12 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV13 SV13 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NA SV14 SV14 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 150 ND<100 370 NA ND<10,000 NA ND<70 NA SV14 [a] SV14_Summa 7/9/2015 ND<210 ND<110 ND<63 ND<90 ND<190 ND<91 ND<91 ND<82 ND<230 ND<250 ND<230 350,000 NA NA NA SV15 SV15 7/9/2015 ND<32 ND<100 760 ND<100 ND<100 ND<100 ND<100 2,100 ND<100 5,900 NA ND<10,000 NA ND<70 NA SV15 [a] SV15_Summa 7/9/2015 ND<32 ND<17 310 ND<13 ND<28 ND<14 ND<14 980 ND<34 1,800 ND<35 320 NA NA NA SV16 SV16 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 240 ND<100 900 NA ND<10,000 NA ND<70 NA SV17 SV17 7/9/2015 NA ND<100 440 ND<100 ND<100 ND<100 ND<100 930 ND<100 2,400 NA ND<10,000 NA ND<70 NA SV47 [a] SV47-20190318 3/18/2019 ND<15 ND<8.0 ND<4.5 ND<6.4 82 ND<6.5 ND<6.5 ND<5.8 ND<16 ND<17 ND<17 ND<13 ND<29 NA NA SV47 SV47-20201217 12/17/2020 ND<14.0 ND<7.6 ND<4.2 ND<6.0 ND<13.0 ND<6.1 ND<6.1 ND<5.5 ND<15.0 ND<17.0 ND<16.0 ND<12.0 ND<28.0 ND<15.0 3.4% SV48 [a] SV48-20190318 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- NA SV48 SV48-20201217 12/17/2020 ND<15.0 ND<8.1 ND<4.5 ND<6.4 ND<13.0 ND<6.5 ND<6.5 ND<5.9 ND<16.0 ND<18.0 ND<17.0 ND<13.0 ND<29.0 ND<16.0 11% SV49 [a] SV49-20190315 3/15/2019 ND<6.4 3.5 23 5.2 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA NA SV49 SV49-20201218 12/18/2020 ND<6.4 ND<3.4 2.6 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12.0 ND<6.6 14% SV50 [a] SV50-20190315 3/15/2019 ND<6.4 ND<3.4 9.8 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA NA SV50 SV50-20201218 12/18/2020 ND<6.4 ND<3.4 ND<1.9 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 12 ND<6.6 16% SV51 [a] SV51-20190318 3/18/2019 ND<6.4 ND<3.4 5.7 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA NA SV51B SV51B-20201218 12/18/2020 ND<17.0 ND<9.2 ND<5.1 ND<7.3 ND<15.0 ND<7.4 ND<7.4 16 ND<19.0 26 ND<19.0 ND<15.0 ND<33.0 ND<18.0 14% 38424 Cedar Boulevard
SV18 SV18 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV19 SV19 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV19 [a] SV19_Summa 7/9/2015 ND<320 ND<170 640 ND<130 ND<280 ND<140 ND<140 130 ND<340 ND<370 ND<350 260,000 NA NA NA SV20 SV20 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV20 [a] SV20_Summa 7/9/2015 ND<6.6 ND<3.5 13 3.9 ND<5.8 ND<2.8 ND<2.8 ND<2.6 ND<7.1 ND<7.7 ND<7.3 9,900 NA NA NA SV21 SV21 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV22 SV22 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV52 [a] SV52-20190318 3/18/2019 ND<6.4 ND<3.4 4.6 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA NA SV52 [a] SV52-20201217 12/17/2020 ND<6.4 130 2.5 23 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 19 ND<6.6 6.3% SV52 [a] SV52-20210120 1/20/2021 ND<6.4 ND<3.4 5.0 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 17 ND<6.6 NA SV52 [a] SV152-20210120 1/20/2021 ND<6.4 ND<3.4 3.8 ND<2.7 ND<5.6 ND<2.7 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 ND<6.6 NA 38456 Cedar Boulevard
SV23 SV23 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV24 SV24 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV25 SV25 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV26 SV26 7/9/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA 38472 Cedar Boulevard
SV27 SV27 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV28 SV28 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV29 SV29 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV30 SV30 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV30 [a] SV30_Summa 7/9/2015 ND<13 ND<6.8 27 ND<5.4 ND<11 ND<5.5 ND<5.5 ND<4.9 ND<14 ND<15 140 72,000 NA NA NA 38486 Cedar Boulevard
SV31 SV31 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV32 SV32 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV32 [a] SV32_Summa 7/9/2015 ND<8.4 ND<4.5 51 ND<3.5 20 120 ND<3.6 ND<3.2 ND<9.1 ND<9.7 ND<9.3 ND<7.1 NA NA NA SV41 [a] SV41_Summa 7/16/2015 ND<16 ND<8.7 10 ND<6.9 63 9.5 ND<7.0 ND<6.3 ND<18 ND<19 ND<18 ND<14 ND<31 NA NA SV54 [a] SV54-20201217 12/17/2020 ND<6.4 ND<3.4 27 4.9 34 48 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12.0 ND<6.6 8.2% SV54 [a] SV154-20201217 12/17/2020 ND<6.4 ND<3.4 22 ND<2.7 29 48 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 57 ND<6.6 8.8% 38592 Cedar Boulevard
SV33 [a] SV33_Summa 7/16/2015 ND<13 ND<6.8 200 ND<5.4 ND<11 210 ND<5.5 ND<4.9 ND<14 ND<15 ND<14 ND<11 ND<25 NA NA SV37 SV37 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV38 SV38 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 110 ND<100 ND<100 ND<100 ND<100 NA ND<10,000 NA ND<70 NA SV42 [a] SV42_Summa 7/16/2015 ND<19 ND<10 22 ND<8.1 ND<17 260 ND<8.3 ND<7.4 ND<21 ND<22 ND<21 ND<16 ND<37 NA NA 38594 Cedar Boulevard
SV34 SV34 7/10/2015 NA ND<100 270 ND<100 ND<100 ND<100 ND<100 350 ND<100 1,000 NA ND<10,000 NA 95 NA SV34 [a] SV34_Summa 7/9/2015 29 5.2 180 ND<3.4 ND<7.2 ND<3.5 7.3 240 9.5 770 ND<9.0 2,700 NA NA NA SV35 SV35 7/10/2015 NA ND<100 ND<200 ND<100 ND<100 ND<100 ND<100 ND<100 ND<100 170 NA ND<10,000 NA ND<70 NA SV36 [a] SV36_Summa 7/16/2015 ND<13 ND<6.8 4.2 ND<5.4 ND<11 ND<5.5 ND<5.5 ND<4.9 ND<14 ND<15 ND<14 280 ND<25 NA NA SV43 [a] SV43_Summa 7/16/2015 ND<27 ND<14 16 ND<11 ND<23 ND<11 ND<11 ND<10 ND<29 ND<31 ND<29 34 ND<51 NA NA SV44 [a] SV44_Summa 7/16/2015 ND<13 ND<6.8 5.6 ND<5.4 ND<11 ND<5.5 ND<5.5 ND<4.9 ND<14 ND<15 ND<14 8,000 62 NA NA SV45 [a] SV45_Summa 7/16/2015 ND<6.4 ND<3.4 18 ND<2.7 ND<5.6 17 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 42 ND<12 NA NA SV53 [a] SV53-20190315 3/15/2019 ND<6.4 8.2 4.9 ND<2.7 ND<5.6 14 ND<2.7 ND<2.5 ND<6.9 ND<7.4 ND<7.0 ND<5.4 ND<12 NA NA SV53 [a] SV53-20201217 12/17/2020 ND<15.0 ND<8.1 ND<4.5 ND<6.4 ND<13.0 13 ND<6.5 ND<5.9 ND<16.0 ND<18.0 ND<17.0 ND<13.0 ND<29.0 ND<16.0 14% 31,000 15 10,000 16 -- 35,000 5.8 -- 1.6 -- -- -- -- 2.8 -- Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

All data are reported in micrograms per cubic meter (µg/m3).

Blue shading denotes detection above screening value.

Mobile lab samples analyzed by EPA Method 8260B.
[a] Summa canister sample analyzed by EPA Method TO-15.

Oxygen + Argon analyzed as a fixed gas by ASTM 1946.

Screening Value from San Francisco Bay
RWQCB ESL for Residential Land Use [1]

Page 8 of 14 ends

Packet Page 2190
Table 6: VOCs and TPH in Groundwater Samples
Results of Groundwater Sampling
38288-38594 Cedar Boulevard, Newark, California
TPH(g) TPH(d) TPH(mo)
Groundwater Monitoring Wells
EW-1 12/22/2020 860 100 NA ND<25 NA NA 75 NA 200 100 300 6,800 1,100 ND<250 MW-1 3/27/2001 6,900 3,200 NA ND NA NA 6,000 NA NA NA 10,000 48,000 4,000 NA 9/19/2002 6,500 2,700 NA 260 NA NA 3,300 NA NA NA 6,300 6,900 6,900 NA 12/13/2002 6,500 2,200 NA 250 NA NA 3,600 NA NA NA 4,700 41,000 3,000 NA 3/13/2003 8,300 2,700 NA 220 NA NA 4,000 NA NA NA 5,700 40,000 4,200 NA 6/19/2003 6,500 2,700 NA 240 NA NA 3,000 NA NA NA 5,800 40,000 6,000 NA 9/15/2003 11,000 4,500 NA 220 NA NA 4,000 NA NA NA 7,200 60,000 4,700 NA 12/19/2003 7,700 2,800 NA 310 NA NA 2,900 NA NA NA 5,400 40,000 5,300 NA 3/23/2004 3,500 1,400 NA 76 NA NA 1,400 NA NA NA 2,900 19,000 5,000 NA 6/10/2004 8,300 3,300 NA 180 NA NA 3,300 NA NA NA 6,600 45,000 4,000 NA 9/9/2004 7,600 3,500 NA 220 NA NA 2,500 NA NA NA 6,700 54,000 5,400 NA 12/6/2004 7,200 3,300 NA ND<1,000 NA NA 1,700 NA NA NA 6,300 43,000 2,600 NA 4/4/2005 5,700 2,700 NA ND<1,000 NA NA 2,200 NA NA NA 4,700 33,000 160 NA 6/27/2005 5,400 2,300 NA ND<1,000 NA NA 1,500 NA NA NA 4,100 29,000 2,900 NA 11/4/2005 5,200 2,400 NA 120 NA NA 930 NA NA NA 4,500 40,000 3,800 NA 2/4/2006 5,000 1,800 NA 140 NA NA 630 NA NA NA 3,030 21,000 2,500 NA 5/4/2006 4,700 2,100 NA 120 NA NA 730 NA NA NA 3,100 24,000 3,300 NA 8/4/2006 4,200 2,200 NA 75 NA NA 810 NA NA NA 2,740 26,000 2,900 NA 11/6/2006 3,900 1,700 NA 64 NA NA 640 NA NA NA 2,180 20,000 1,900 NA 2/8/2007 3,200 1,100 NA 51 NA NA 760 NA NA NA 1,790 14,000 2,700 NA 5/14/2007 680 350 NA 9.1 NA NA 150 NA NA NA 360 5,000 870 NA 8/8/2007 3,100 1,400 NA 44 NA NA 630 NA NA NA 2,500 21,000 1,200 NA 11/8/2007 2,700 1,100 NA 29 NA NA 420 NA NA NA 1,200 10,000 1,100 NA 7/20/2015 3,200 780 ND<100 ND<100 350 140 190 180 NA NA 740 20,000 2,600 340 9/21/2018 4,800 ND<100 ND<100 120 340 130 ND<100 ND<100 77 ND<50 77 21,000 2,300 ND<250 3/15/2019 1,600 300 66 ND<50 400 210 62 ND<50 160 ND<50 160 15,000 2,900 ND<250 12/22/2020 3,500 75 NA ND<50 NA NA ND<50 NA ND<50 ND<50 ND<50 13,000 2,800 ND<250 12/22/2020 2,700 65 NA ND<50 NA NA ND<50 NA ND<50 ND<50 ND<50 13,000 2,100 ND<250 MW-2 3/27/2001 ND ND NA 3.5 NA NA ND NA NA NA ND ND ND NA 9/19/2002 ND<0.50 ND<0.50 NA 3.5 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 140 NA 12/13/2002 0.95 ND<0.50 NA 2.4 NA NA 0.93 NA NA NA ND<1.0 ND<50 560 NA 3/13/2003 ND<0.50 ND<0.50 NA 1.7 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 360 NA 6/19/2003 ND<0.50 ND<0.50 NA 5.8 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 150 NA 9/15/2003 1.3 1.2 NA 5.7 NA NA 0.91 NA NA NA 1.9 ND<50 67 NA 12/19/2003 ND<0.50 ND<0.50 NA 4.8 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 94 NA 3/23/2004 ND<0.50 ND<0.50 NA 4.2 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 190 NA 6/10/2004 ND<0.50 ND<0.50 NA 6.3 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 ND<50 NA 9/9/2004 ND<0.50 ND<0.50 NA 5.4 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 63 NA 1 300 450 13 0.17 660 150 56 190 190 1,750 760 200 410

MCL MCL RSL MCL ESL RSL MCL RSL RSL RSL MCL ESL ESL ESL Total Petroleum
Hydrocarbons (TPH)
Ethylbenzene Isopropylbenzene m,p-Xylene o-Xylene
Sample
Location
Sample
Date Benzene
Volatile Organic Compounds (VOCs)
Xylenes,
MTBE Naphthalene Total
n-Propyl
benzene
38370 Cedar Boulevard
Screening Value
Toluene
1,2,4-
Trimethylbenzene

Page 9 of 14 ends

Packet Page 2191
Table 6: VOCs and TPH in Groundwater Samples
Results of Groundwater Sampling
38288-38594 Cedar Boulevard, Newark, California
TPH(g) TPH(d) TPH(mo)
Total Petroleum
Hydrocarbons (TPH)
Ethylbenzene Isopropylbenzene m,p-Xylene o-Xylene
Sample
Location
Sample
Date Benzene
Volatile Organic Compounds (VOCs)
Xylenes,
MTBE Naphthalene Total
n-Propyl
benzene Toluene
1,2,4-
Trimethylbenzene
MW-2 12/6/2004 ND<0.50 ND<0.50 NA ND<5.0 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 310 NA 4/4/2005 ND<0.50 ND<0.50 NA ND<5.0 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 2,100 NA 6/27/2005 ND<0.50 ND<0.50 NA 0.62 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 85 NA 11/4/2005 ND<0.50 ND<0.50 NA 8.8 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 110 NA 2/4/2006 ND<0.50 ND<0.50 NA 4.2 NA NA ND<0.50 NA NA NA 0.57 ND<50 190 NA 5/4/2006 ND<0.50 ND<0.50 NA 0.62 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 97 NA 8/4/2006 ND<0.50 ND<0.50 NA 1.2 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 540 NA 11/6/2006 1.1 1.6 NA 1.6 NA NA 0.92 NA NA NA 2.44 ND<50 ND<50 NA 2/8/2007 ND<0.50 ND<0.50 NA 0.76 NA NA 0.63 NA NA NA 0.84 ND<50 180 NA 5/14/2007 ND<0.50 ND<0.50 NA ND<1.0 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 220 NA 8/8/2007 ND<0.50 ND<0.50 NA 3.1 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 270 NA 11/8/2007 0.71 1.2 NA 1.3 NA NA 4.0 NA NA NA 4.7 ND<50 320 NA 2/6/2008 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 2,300 [a] NA 7/20/2015 NA NA NA NA NA NA NA NA NA NA NA NA NA NA
3/6/2019
MW-3 3/27/2001 ND ND NA 26 NA NA ND NA NA NA ND ND ND NA 9/19/2002 ND<0.50 ND<0.50 NA 50 NA NA ND<0.50 NA NA NA ND<1.0 54 230 NA 12/13/2002 ND<0.50 ND<0.50 NA 66 NA NA ND<0.50 NA NA NA ND<1.0 65 160 NA 3/13/2003 ND<0.50 ND<0.50 NA 57 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 200 NA 6/19/2003 0.57 ND<0.50 NA 33 NA NA 0.54 NA NA NA 1.1 ND<50 160 NA 9/15/2003 ND<0.50 ND<0.50 NA 23 NA NA ND<0.50 NA NA NA ND<1.0 60 170 NA 12/19/2003 ND<0.50 ND<0.50 NA 52 NA NA ND<0.50 NA NA NA ND<1.0 59 120 NA 3/23/2004 ND<0.50 ND<0.50 NA 14 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 220 NA 6/10/2004 ND<0.50 ND<0.50 NA 15 NA NA ND<0.05 NA NA NA ND<1.0 ND<0.50 59 NA 9/9/2004 ND<0.50 ND<0.50 NA 36 NA NA ND<0.50 NA NA NA ND<1.0 62 120 NA 12/6/2004 ND<0.50 ND<0.50 NA 24 NA NA ND<0.50 NA NA NA ND<0.50 52 150 NA 4/4/2005 ND<0.50 ND<0.50 NA 7.6 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 830 NA 6/27/2005 ND<0.50 ND<0.50 NA 5.1 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 ND<50 NA 11/4/2005 ND<0.50 ND<0.50 NA 4.8 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 ND<50 NA 2/4/2006 ND<0.50 ND<0.50 NA 5.3 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 ND<50 NA 5/4/2006 ND<0.50 ND<0.50 NA 3.8 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 ND<50 NA 8/4/2006 ND<0.50 ND<0.50 NA 3.2 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 53 NA 11/6/2006 ND<0.50 ND<0.50 NA 3.0 NA NA ND<0.50 NA NA NA ND<0.50 ND<50 ND<50 NA 2/8/2007 ND<0.50 ND<0.50 NA 3.3 NA NA 0.52 NA NA NA 0.58 ND<50 ND<50 NA 5/14/2007 ND<0.50 ND<0.50 NA 2.4 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 ND<50 NA 8/8/2007 ND<0.50 ND<0.50 NA 2.8 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 72 NA 11/8/2007 ND<0.50 ND<0.50 NA 3.2 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 ND<50 NA 2/6/2008 ND<0.50 ND<0.50 NA 1.7 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 1,100 [a] NA 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 12/21/2020 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA ND<0.50 ND<0.50 ND<0.50 ND<50 ND<50 ND<250 MW-4 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 67 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 12/21/2020 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA ND<0.50 ND<0.50 ND<0.50 ND<50 150 440 1 300 450 13 0.17 660 150 56 190 190 1,750 760 200 410
MCL MCL RSL MCL ESL RSL MCL RSL RSL RSL MCL ESL ESL ESL Screening Value Well destroyed.

Page 10 of 14 ends

Packet Page 2192
Table 6: VOCs and TPH in Groundwater Samples
Results of Groundwater Sampling
38288-38594 Cedar Boulevard, Newark, California
TPH(g) TPH(d) TPH(mo)
Total Petroleum
Hydrocarbons (TPH)
Ethylbenzene Isopropylbenzene m,p-Xylene o-Xylene
Sample
Location
Sample
Date Benzene
Volatile Organic Compounds (VOCs)
Xylenes,
MTBE Naphthalene Total
n-Propyl
benzene Toluene
1,2,4-
Trimethylbenzene
MW-5 7/20/2015 ND<0.50 ND<0.50 ND<0.50 1.3 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 12/21/2020 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA ND<0.50 ND<0.50 ND<0.50 ND<50 ND<50 ND<250 MW-6 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 12/21/2020 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA ND<0.50 ND<0.50 ND<0.50 ND<50 ND<50 ND<250 MW-7 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 12/21/2020 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA ND<0.50 ND<0.50 ND<0.50 ND<50 ND<50 ND<250 MW-10 3/6/2019 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<50 ND<50 ND<250 12/21/2020 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA ND<0.50 ND<0.50 ND<0.50 ND<50 ND<50 ND<250 MW-11 12/21/2020 ND<0.50 ND<0.50 NA 1.4 NA NA ND<0.50 NA ND<0.50 ND<0.50 ND<0.50 ND<50 ND<50 ND<250 38288 Cedar Boulevard
MW-8 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 ND<50 ND<250 MW-9 7/20/2015 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 NA NA ND<0.50 ND<50 ND<50 ND<250 9/21/2018 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.25 ND<0.25 ND<0.25 ND<50 100 ND<250 38594 Cedar Boulevard
MW-12 12/22/2020 NA ND<0.50 NA ND<0.50 NA NA ND<0.50 NA ND<0.50 ND<0.50 ND<0.50 ND<50 ND<50 ND<250 One-Time Grab Groundwater Samples
B6 11/2/2007 ND<2.5 40 NA ND<2.5 NA NA ND<2.5 NA NA NA ND<5.0 4,400 1,300 NA B7 11/2/2007 ND<5.0 15 NA 7.1 NA NA ND<5.0 NA NA NA 10 2,800 44,000 NA B8 11/2/2007 0.98 ND<0.50 NA 0.98 NA NA ND<0.50 NA NA NA ND<1.0 590 600 NA B10 11/1/2007 ND<0.50 ND<0.50 NA 1.3 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 74 NA B11 11/2/2007 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA NA NA ND<1.0 240 210 NA B13 11/1/2007 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA NA NA ND<1.0 96 53 NA B14 11/1/2007 ND<0.50 ND<0.50 NA ND<0.50 NA NA ND<0.50 NA NA NA ND<1.0 ND<50 57 NA SB1 3/5/2001 44 190 NA ND NA NA 66 NA NA NA ND 11,000 31,000 NA SB2 3/5/2001 2.8 1.1 NA 7.8 NA NA 0.72 NA NA NA 1.5 260 130 NA SB3 3/5/2001 230 1,200 NA ND NA NA 39 NA NA NA 120 17,000 5,900 NA SBNA-1 12/15/2020 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 NA ND<0.50 NA ND<0.50 ND<0.50 ND<0.50 ND<50 ND<50 ND<250 EW-1 3/14/2019 220 56 ND<10 ND<10 29 15 130 34 100 43 140 2,400 350 ND<250 38288 Cedar Boulevard
SB27 1/16/2019 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<50 83 720 38594 Cedar Boulevard
SB28 1/15/2019 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<0.50 ND<50 330 3,100 1 300 450 13 0.17 660 150 56 190 190 1,750 760 200 410

MCL MCL RSL MCL ESL RSL MCL RSL RSL RSL MCL ESL ESL ESL Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

Duplicate samples are italicized.

All data are reported in micrograms per liter (µg/L).

Blue shading denotes detection above regulatory screening level.

Volatile organic compounds (VOCs) analyzed by EPA method 8260B.

Total petroleum hydrocarbons (TPH) analyzed by EPA Method 8015.

ND = not detected at or above laboratory reporting limit shown TPH(d) = total petroleum hydrocarbons diesel range (C10-C23) TPH(g) = total petroleum hydrocarbons gasoline range (C6-C12) TPH(mo) = total petroleum hydrocarbons motor oil range (C18-C36) [a] Reported TPH(d) concentration suspect due to apparent surface water infiltration into well.

Screening Value Sources:

ESL = Environmental Screening Levels. San Francisco Bay Regional Water Quality Control Board. ESL Priority. July 2019.

MCL = Maximum Contaminant Levels. California Code of Regulations (CCR). Title 22, §64444.

RSL = USEPA Screening Levels for Chemical Contaminants. RSL Summary Table (TR=1E-6, HQ=1). May 2021.

Screening Value
38370 Cedar Boulevard

Page 11 of 14 ends

Packet Page 2193
Table 7: Summary of Groundwater Elevations
38288-38594 Cedar Boulevard, Newark, California
Well No.

Date
Measured
TOC Elevation
(feet above
MSL)
Depth to
Groundwater
(feet below
TOC)
Groudwater
Elevation
(feet above
MSL)
MW-1 3/27/2001 30.33 9.01 21.32
9/19/2002 30.33 10.59 19.74
12/13/2002 30.33 10.85 19.48
3/13/2003 30.33 9.41 20.92
6/19/2003 30.33 9.56 20.77
9/15/2003 30.33 10.39 19.94
12/19/2003 30.33 10.43 19.90
3/23/2004 30.33 9.77 20.56
6/10/2004 30.33 10.50 19.83
9/9/2004 30.33 11.21 19.12
12/6/2004 30.33 11.25 19.16
4/4/2005 30.33 9.02 21.31
6/27/2005 30.33 9.34 20.99
11/4/2005 30.33 10.29 20.04
2/4/2006 30.33 9.12 21.21
5/4/2006 30.33 8.50 21.83
8/4/2006 30.33 9.29 21.04
11/6/2006 30.33 10.13 20.20
2/8/2007 30.33 9.78 20.55
5/14/2007 30.33 9.59 20.74
8/8/2007 30.33 10.40 19.93
11/8/2007 30.33 9.72 20.61
7/20/2015 30.63a 10.34 20.29
9/21/2018 30.63 10.91 19.72
3/11/2019 30.63 8.75 21.88
12/21/2020 30.63 11.29 19.34
MW-2 3/27/2001 30.42 9.65 20.77
9/19/2002 30.42 10.74 19.68
12/13/2002 30.42 10.61 19.81
3/13/2003 30.42 9.81 20.61
6/19/2003 30.42 9.73 20.69
9/15/2003 30.42 10.49 19.93
12/19/2003 30.42 10.49 19.93
3/24/2004 30.42 9.91 20.51
6/10/2004 30.42 10.61 19.81
9/9/2004 30.42 11.35 19.07
12/6/2004 30.42 11.30 19.12
4/4/2005 30.42 7.03 23.39
6/27/2005 30.42 9.46 20.96
11/4/2005 30.42 10.50 19.92
2/4/2006 30.42 9.25 21.17
5/4/2006 30.42 8.47 21.95
8/4/2006 30.42 9.46 20.96
11/6/2006 30.42 10.20 20.22
2/8/2007 30.42 10.12 20.30

Page 12 of 14 ends

Packet Page 2194
Table 7: Summary of Groundwater Elevations
38288-38594 Cedar Boulevard, Newark, California
Well No.

Date
Measured
TOC Elevation
(feet above
MSL)
Depth to
Groundwater
(feet below
TOC)
Groudwater
Elevation
(feet above
MSL)
MW-2 5/14/2007 30.42 9.75 20.67
8/8/2007 30.42 10.43 19.99
11/8/2007 30.42 10.95 19.47
2/6/2008 30.42 8.96 21.46
7/20/2015 30.73a 10.49 20.24
3/6/2019
MW-3 3/27/2001 30.84 9.20 21.64
9/19/2002 30.84 11.17 19.67
12/13/2002 30.84 11.39 19.45
3/13/2003 30.84 9.99 20.85
6/19/2003 30.84 10.15 20.69
9/15/2003 30.84 10.94 19.90
12/19/2003 30.84 11.01 19.83
3/24/2004 30.84 10.29 20.55
6/10/2004 30.84 11.05 19.79
9/9/2004 30.84 11.70 19.19
12/6/2004 30.84 11.75 19.74
4/4/2005 30.84 9.22 21.62
6/27/2005 30.84 9.88 20.96
11/4/2005 30.84 10.89 19.95
2/4/2006 30.84 9.42 21.42
5/4/2006 30.84 8.95 21.89
8/4/2006 30.84 9.87 20.97
11/6/2006 30.84 10.71 20.13
2/8/2007 30.84 10.59 20.25
5/14/2007 30.84 10.19 20.65
8/8/2007 30.84 10.96 19.88
11/8/2007 30.84 11.35 19.49
2/6/2008 30.84 9.88 20.96
7/20/2015 31.19a 11.00 20.19
9/21/2018 31.19 11.34 19.85
3/11/2019 31.19 9.35 21.84
12/21/2020 31.19 11.85 19.34
MW-4 7/20/2015 29.91 9.22 20.69
9/21/2018 29.91 10.11 19.80
3/11/2019 29.91 7.85 22.06
12/21/2020 29.91 10.51 19.40
MW-5 7/20/2015 31.45 11.82 19.63
9/21/2018 31.45 11.72 19.73
3/11/2019 31.45 9.67 21.78
12/21/2020 31.45 12.08 19.37
MW-6 7/20/2015 30.57 10.99 19.58
9/21/2018 30.57 10.99 19.58
3/11/2019 30.57 9.03 21.54
12/21/2020 30.57 11.40 19.17
MW-7 7/20/2015 31.43 11.55 19.88
9/21/2018 31.43 11.69 19.74
3/11/2019 31.43 9.69 21.74
12/21/2020 31.43 12.14 19.29
Well destroyed.

Page 13 of 14 ends

Packet Page 2195
Table 7: Summary of Groundwater Elevations
38288-38594 Cedar Boulevard, Newark, California
Well No.

Date
Measured
TOC Elevation
(feet above
MSL)
Depth to
Groundwater
(feet below
TOC)
Groudwater
Elevation
(feet above
MSL)
MW-8 7/20/2015 30.44 10.25 20.19
9/21/2018 30.44 10.71 19.73
3/11/2019 30.44 8.53 21.91
12/21/2020 30.44 11.08 19.36
MW-9 7/20/2015 30.46 10.00 20.46
9/21/2018 30.46 10.71 19.75
3/11/2019 30.46 8.46 22.00
12/21/2020 30.46 11.00 19.46
MW-10 3/11/2019 30.85 9.08 21.77
12/21/2020 30.85 11.50 19.35
MW-11 12/21/2020 30.31 11.08 19.23
MW-12 12/21/2020 30.82 11.88 18.94
EW-1 3/11/2019 30.92 9.06 21.86
12/21/2020 30.92 11.55 19.37
Notes:

All measurements are in feet and well elevations measured to the top of each well casing.

MSL = mean sea level
NA = not available
TOC = top of casing
a Well casings were repaired on July 13, 2015 and resurveyed by Ruggeri-Jensen-Azar along with wells MW-4 through MW-9 on July 23, 2015.

Page 14 of 14 ends

Packet Page 2196
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Appendices Ramboll

APPENDIX A

BORING LOGS AND WELL CONSTRUCTION DIAGRAMS
Packet Page 2197
DRAFT

6.5 2.0

0.4 0.4

0.1 0.1

0.2 0.4

0.4 ML
ML
ML
SM
SP
ML
SM
SP
GRAVELLY SILT with sand (ML), DARK GRAYISH BROWN (2.5Y 4/2); firm, nonplastic; medium to coarse grained sand; subangular to subrounded gravel up to

0.5 inches; moist (30% gravel, 20% sand, 50% fines).

SILT with sand (ML), VERY DARK GRAYISH BROWN (10YR 3/2); stiff to very stiff, low plasticity; very fine grained sand; moist (0% gravel, 15% sand, 85% fines).

SANDY SILT (ML), DARK GRAYISH BROWN (2.5Y 4/2); firm, nonplastic; very fine grained sand; moist (0% gravel, 40% sand, 60% fines).

SILTY SAND (SM), DARK GRAYISH BROWN (2.5Y 4/2); very fine to fine grained sand; moist (0% gravel, 70% sand, 30% fines).

SAND (SP), DARK GRAYISH BROWN (2.5Y 4/2); very fine grained sand; wet (0% gravel, 100% sand, 0% fines).

From 11.0 feet: sand becomes very fine grained.

From 12.0 feet: sand becomes very fine to medium grained.

SILT with sand (ML), DARK GRAYISH BROWN (2.5Y 4/2); stiff, nonplastic; very fine grained sand; moist (0% gravel, 15% sand, 85% fines).

SILTY SAND (SM), DARK GRAYISH BROWN (2.5Y 4/2); very fine grained sand; moist (0% gravel, 60% sand, 40% fines).

SAND (SP), DARK GRAYISH BROWN (2.5Y 4/2); very fine grained sand; moist (0% gravel, 100% sand, 0% fines).

1. Direct push boring drilled to a total depth of 20.0 feet on 12/14/2020.

2. Direct push boring hole over-drilled by 10-inch hollow stem auger to a total depth of

20.0 feet on 12/14/2020.

3. Monitoring well MW-11 constructed in borehole on 12/14/2020. 2200 Powell Street, Suite 700, Emeryville, CA 94608
Rig Type: Geoprobe 7822DT
Driller: J. Munoz
Split Acetate Liner GS Elevation:

Hollow Stem Auger / Direct Push
Boring Number:

Total Depth:

TOC Elevation:

Checked By:

MW-11
Lithology and soil samples taken from Direct Push boring drilled to a total depth of 20.0 feet bgs.
10 inches
Blank Casing (feet):
12/14/2020
Location:

Not Available

20.0 feet
T. Winger
Borehole Dia.:
4" Sch. 40 PVC
Easting:

Project Number:

Annular Fill (feet):

Sampling Method:

PeneCore
Drilling Method:

Contractor: Project Name:

Date(s):

Logged By:

30.31 ft. MSL
Newark, California
Freitas - Cedar Boulevard
Well Construction Details
Screen (feet):

0.0 to 10.0

10.0 to 20.0
Northing:

0.0 to 8.0

8.0 to 9.0

9.0 to 20.0
1690019190

0.010" Slot Sch. 40 PVC
Neat Portland Cement
3/8" Hole Plug Bentonite Pellets
#2/12 Lapis Lustre Monterey Sand

37.533330800 -122.010456300
Notes:

Elevation (ft.)Depth (ft)Soil DriveIntervalSoil SampleIntervalPID (ppm)Unit/FormationGraphic LogUSCS CodeDepth (ft) 5 10
15 20
25 5
10 15
20 25
30 25
20 15
10 5
Well
Material Description Construction

Page 1 of 1 ends

Recovery
Key No Recovery Equilibrated groundwater
(12/21/2020)
Core Recovery First saturated soil cuttings
Soil Sample
Packet Page 2198
DRAFT

0.1 0.2

0.1 0.1

0.3 0.1

0.1 0.1

0.2 ML
ML
SM
SP
ML
ML
SILT with sand and gravel (ML), VERY DARK GRAYISH BROWN (10YR 3/2); firm, nonplastic friable; very fine to fine grained sand; subangular to subrounded gravel up to 0.25 inches; moist (15% gravel, 15% sand, 70% fines).

SILT with sand (ML), VERY DARK GRAY (10YR 3/1); firm, nonplastic, friable; very fine to fine grained sand; odor present, moist (0% gravel, 20% sand, 80% fines).

SILTY SAND (SM), DARK GRAYISH BROWN (2.5Y 4/2); fine grained sand; moist (0% gravel, 60% sand, 40% fines).

SAND (SP), DARK GRAYISH BROWN (2.5Y 4/2); very fine to fine grained sand; wet (0% gravel, 100% sand, 0% fines).

From 11.0 feet: sand becomes fine to medium grained.

From 12.0 feet: sand becomes medium grained.

SILT with sand (ML), DARK GRAYISH BROWN (2.5Y 4/2); stiff, low plasticity; very fine grained sand; moist (0% gravel, 20% sand, 80% fines).

SANDY SILT (ML), DARK GRAYISH BROWN (2.5Y 4/2); soft, firm, nonplastic; very fine to fine grained sand; wet (0% gravel, 30% sand, 70% fines).

INTERBEDDED SILT with sand (ML), DARK GRAYISH BROWN (2.5Y 4/2); stiff, low plasticity; very fine grained sand; wet (0% gravel, 20% sand, 80% fines).

1. Direct push boring drilled to a total depth of 20.0 feet on 12/14/2020.

2. Direct push boring hole over-drilled by 10-inch hollow stem auger to a total depth of

20.0 feet on 12/14/2020.

3. Monitoring well MW-12 constructed in borehole on 12/14/2020. 2200 Powell Street, Suite 700, Emeryville, CA 94608
Rig Type: Geoprobe 7822DT
Driller: J. Munoz
Split Acetate Liner GS Elevation:

Hollow Stem Auger / Direct Push
Boring Number:

Total Depth:

TOC Elevation:

Checked By:

MW-12
Lithology and soil samples taken from Direct Push boring drilled to a total depth of 20 feet bgs.
10 inches
Blank Casing (feet):
12/14/2020
Location:

Not Available

20.0 feet
T. Winger
Borehole Dia.:
4" Sch. 40 PVC
Easting:

Project Number:

Annular Fill (feet):

Sampling Method:

PeneCore
Drilling Method:

Contractor: Project Name:

Date(s):

Logged By:

30.82 ft. MSL
Newark, California
Freitas - Cedar Boulevard
Well Construction Details
Screen (feet):

0.0 to 10.0

10.0 to 20.0
Northing:

0.0 to 8.0

8.0 to 9.0

9.0 to 20.0
1690019190

0.010" Slot Sch. 40 PVC
Neat Portland Cement
3/8" Hole Plug Bentonite Pellets
#2/12 Lapis Lustre Monterey Sand

37.532941400 -122.008745800
Notes:

Elevation (ft.)Depth (ft)Soil DriveIntervalSoil SampleIntervalPID (ppm)Unit/FormationGraphic LogUSCS CodeDepth (ft) 5 10
15 20
25 5
10 15
20 25
30 25
20 15
10 5
Well
Material Description Construction

Page 1 of 1 ends

Recovery
Key No Recovery Equilibrated groundwater
(12/21/2020)
Core Recovery First saturated soil cuttings
Soil Sample
Packet Page 2199
DRAFT
FILL; Gravel with sand (under concrete slab).

SILT with sand (ML), VERY DARK YELLOWISH BROWN (10YR 3/2); stiff, low plasticity; very fine grained sand; moist (0% gravel, 15% sand, 85% fines).

Direct push boring drilled to a total depth of 5.0 feet on 12/16/2020.

0.0 0.1

0.1 Elevation (ft.)Depth (ft)Soil DriveIntervalSoil SampleIntervalPID (ppm)Unit/FormationGraphic LogUSCS CodeDepth (ft) 2200 Powell Street, Suite 700, Emeryville, CA 94608
Rig Type: Geoprobe 7822DT
Driller: J. Munoz

5.0 feet
T. Winger
GS Elevation: Not Available TOC Elevation: Not Available Northing: Easting: Not Available

2.25 inches
Project Number: Boring Number: SB29
Sampling Method:

PeneCore
Drilling Method:

Contractor:

Location:

Project Name: Freitas - Cedar Boulevard
1690019190
Remarks
Checked By:

Total Depth:

Date(s):

Borehole Dia.:

Logged By:

Split Acetate Liner
Direct Push 12/16/2020
Not Available
Newark, California
Notes:

Lithology and soil samples taken from Direct Push boring drilled to a total depth of 5 feet bgs.
5 10
15 20
25 5
10 15
20 25
Material Description
5/18/2021

Page 1 of 1 ends

Recovery
Key No Recovery
Core Recovery
Soil Sample
Packet Page 2200
DRAFT
GRAVELLY SILT with sand (ML), VERY DARK GRAYISH BROWN (2.5Y 3/2); firm, nonplastic; fine to medium grained sand; subangular to subrounded gravels up to 1.0 inches; moist (35% gravel, 20% sand, 45% fines).

SILT with sand (ML), BROWN (10YR 3/2); stiff to very stiff, low plasticity; very fine grained sand; moist (0% gravel, 15% sand, 85% fines).

From 5.0 feet: color becomes Dark Grayish Brown (2.5YR 4/2); becomes firm.

SANDY SILT (ML), DARK GRAYISH BROWN (2.5Y 4/2); firm, nonplastic; very fine to fine grained sand; moist (0% gravel, 35% sand, 65% fines).

SAND (SP), DARK GRAYISH BROWN (2.5Y 4/2); very fine grained sand; moist (0% gravel, 100% sand, 0% fines).

From 11.0 feet: sand becomes very fine to fine grained; becomes wet.

From 12.0 feet: sand becomes medium to coarse grained.

At 13.0 feet: some fine gravels present.

SILT with sand (ML), DARK GRAYISH BROWN (2.5Y 4/2); firm, nonplastic; very fine to fine grained sand; moist (0% gravel, 20% sand, 80% fines).

SAND (SP), OLIVE BROWN (2.5Y 4/3); fine grained sand; wet (0% gravel, 100% sand, 0% fines).

SILTY SAND (SM), OLIVE BROWN (2.5Y 4/3); fine grained sand; wet (0% gravel, 70% sand, 30% fines).

SAND (SP), OLIVE BROWN (2.5Y 4/3); very fine to medium grained sand; wet (0% gravel, 100% sand, 0% fines).

At 28.0 feet: poor recovery; loose sand based on bottom of core.

ML
ML
ML
SP
ML
SP
SM
SP

0.1 0.2

0.3 0.1

0.2 0.3

0.3 0.3

0.2 0.1

0.3 0.2

0.3 0.1

0.2 0.3

60.0 feet
T. Winger
GS Elevation: Not Available TOC Elevation: Not Available Northing: Easting: Not Available

4.5 & 2.25 inches
Project Number: Boring Number: SBNA-1
Sampling Method:

PeneCore
Drilling Method:

Contractor:

Location:

Project Name: Freitas - Cedar Boulevard
1690019190
Remarks
Checked By:

Total Depth:

Date(s):

Borehole Dia.:

Logged By:

Split Acetate Liner
Direct Push 12/15/2020
Not Available
Newark, California
Notes:

1. Lithology and soil samples taken from Direct Push boring drilled to a total depth of 60 feet bgs.

2. Boring drilled with 4.5 inch diameter outer casing to 40 feet bgs, and 2.25 inch diameter inner casing from 40 to 60 feet bgs.
5 10
15 20
25 5
10 15
20 25
Material Description
5/18/2021

Page 1 of 2 ends

Recovery
Key No Recovery Equilibrated groundwater
(12/15/2020)
Core Recovery First saturated soil cuttings
Soil Sample
Packet Page 2201
DRAFT
From 30.0 to 32.0 feet: sand becomes fine to medium grained; color becomes Dark Grayish Brown (2.5Y 4/2).

From 32.0 to 34.0 feet: sand becomes very fine to fine grained; color becomes Dark Gray (2.5Y 4/1).

CLAY (CL), DARK GRAY (2.5Y 4/1); firm, low to medium plasticity; organics present; moist (0% gravel, 0% sand, 100% fines).

At 37.0 feet: 6.0-inch lense of clay that is softer and saturated with water.

At 40.0 feet: switch to 2.25 inch inner casing.

SILT (ML), DARK GREENISH GRAY (GLEY1 4/1); firm, nonplastic; very fine grained sand; moist (0% gravel, 10% sand, 90% fines).

CLAY (CL), DARK GREENISH GRAY (GLEY1 4/1); stiff to very stiff, nonplastic to low plasticity; moist (0% gravel, 0% sand, 100% fines).

SILT with gravel (ML), GREENISH GRAY (GLEY1 5/1); firm, nonplastic; subangular to angular gravels up to 0.5 inches; moist (20% gravel, 0% sand, 80% fines).

CLAY (CL), DARK GREENISH GRAY (GLEY1 4/1); stiff to very stiff, nonplastic to low plasticity; moist (0% gravel, 0% sand, 100% fines).

From 49.0 feet: color becomes Greenish Gray (GLEY1 5/1) with Olive Brown (2.5Y 5/5) mottling (mottling decreases with depth); firm to stiff, medium plasticity; organics present.

From 52.5 feet: color becomes Dark Greenish Gray (GLEY1 4/1); stiff; low plasticity.

At 54.5 feet: roots present; 6.0-inch lense of dense SANDY SILT (0% gravel, 30% sand, 70% fines).

CLAY with sand (CL), VERY DARK GREENISH GRAY (GLEY1 3/1); firm, nonplastic; very fine grained sand; moist (0% gravel, 25% sand, 75% fines).

GRAVELLY SAND (SP), OLIVE BROWN (2.5YR 4/3); fine grained sand; subangular to subrounded gravels up to 0.75 inches; wet (40% gravel, 60% sand, 0% fines).

1. Direct push boring drilled to a total depth of 60.0 feet on 12/15/2020.

2. 4.5-inch diameter conductor casing installed to a depth of 40.0 feet.

3. 2.25-inch diameter inner casing installed to a depth of 60.0 feet and pulled back to expose 55.0 to 60 feet.

4. Grab groundwater sample collected on 12/15/2020 from temporary PVC well installed with the bottom five feet screened from 55.0 to 60.0 feet bgs.

SP
CL
ML
CL
ML
CL
CL
SP

0.2 0.3

0.1 0.1

0.1 0.2

0.2 0.1

0.2 0.2

0.1 0.2

0.3 0.3
Elevation (ft.)Depth (ft)Soil DriveIntervalSoil SampleIntervalPID (ppm)Unit/FormationGraphic LogUSCS CodeDepth (ft) 2200 Powell Street, Suite 700, Emeryville, CA 94608 Date(s):

Freitas - Cedar Boulevard
12/15/2020
Project No.: 1690019190 Boring No.: SBNA-1
Project Name:
35 40
45 50
55 60
65 35
40 45
50 55
60 65
Material Description
5/18/2021

Page 2 of 2 ends

Recovery
Key No Recovery Equilibrated groundwater
(12/15/2020)
Core Recovery First saturated soil cuttings
Soil Sample
Packet Page 2202
DRAFT

1.2 0.9

1.4 2.1
CL
ML
ML
FILL; Gravelly silt.

CLAY (CL), VERY DARK GRAYISH BROWN (10YR 3/2); very stiff, low plasticity; very fine grained sand; dry (0% gravel, 10% sand, 90% fines).

SILT with sand (ML), DARK GRAYISH BROWN (2.5Y 4/2); firm, nonplastic, friable; very fine grained sand; moist (0% gravel, 20% sand, 80% fines).

SANDY SILT (ML), DARK GRAYISH BROWN (2.5Y 4/2); firm, nonplastic, friable; very fine grained sand; moist (0% gravel, 40% sand, 60% fines).

Direct push boring drilled to a total depth of 7.5 feet on 12/16/2020. 2200 Powell Street, Suite 700, Emeryville, CA 94608
Rig Type: Geoprobe 7822DT
Driller: J. Munoz
Split Acetate Liner GS Elevation:

Direct Push
Boring Number:

Total Depth:

TOC Elevation:

Checked By:

SV-51B
Lithology and soil samples taken from Direct Push boring drilled to a total depth of 7.5 feet bgs.

4.5 inches
Blank Casing (feet):
12/16/2020
Location:

Not Available

7.5 feet
T. Winger
Borehole Dia.:
1/4" Teflon Tubing
Easting:

Project Number:

Annular Fill (feet):

Sampling Method:

PeneCore
Drilling Method:

Contractor: Project Name:

Date(s):

Logged By:

Not Available
Newark, California
Freitas - Cedar Boulevard
Well Construction Details
Screen (feet):

0.0 to 7.0

7.0 to 7.0
Northing:

0.0 to 5.5

5.5 to 6.5

6.5 to 7.5
1690019190
Stainless Steel Probe Tip
Neat Portland Cement
3/8" Hole Plug Bentonite Pellets
#2/12 Lapis Lustre Monterey Sand

37.533284100 -122.010472100
Notes:

Elevation (ft.)Depth (ft)Soil DriveIntervalSoil SampleIntervalPID (ppm)Unit/FormationGraphic LogUSCS CodeDepth (ft) 5 10
15 20
25 5
10 15
20 25
Well
Material Description Construction

Page 1 of 1 ends

Recovery
Key No Recovery
Core Recovery
Soil Sample
Packet Page 2203
DRAFT

0.1 0.1

0.0 0.1
CL
ML
ML
FILL; Gravelly silt.

CLAY (CL), VERY DARK GRAYISH BROWN (10YR 3/2); very stiff, low plasticity; very fine grained sand; dry (0% gravel, 10% sand, 90% fines).

SILT with sand (ML), DARK GRAYISH BROWN (2.5Y 4/2); firm, nonplastic, friable; very fine grained sand; moist (0% gravel, 20% sand, 80% fines).

SANDY SILT (ML), DARK GRAYISH BROWN (2.5Y 4/2); soft, nonplastic, friable; very fine grained sand; moist (0% gravel, 45% sand, 55% fines).

Direct Push
Boring Number:

Total Depth:

TOC Elevation:

Checked By:

SV-54
Lithology and soil samples taken from Direct Push boring drilled to a total depth of 7.5 feet bgs.

4.5 inches
Blank Casing (feet):
12/16/2020
Location:

Not Available

7.5 feet
T. Winger
Borehole Dia.:
1/4" Teflon Tubing
Easting:

Project Number:

Annular Fill (feet):

Sampling Method:

PeneCore
Drilling Method:

Contractor: Project Name:

Date(s):

Logged By:

Not Available
Newark, California
Freitas - Cedar Boulevard
Well Construction Details
Screen (feet):

0.0 to 7.0

7.0 to 7.0
Northing:

0.0 to 5.5

5.5 to 6.5

6.5 to 7.5
1690019190
Stainless Steel Probe Tip
Neat Portland Cement
3/8" Hole Plug Bentonite Pellets
#2/12 Lapis Lustre Monterey Sand

37.532448100 -122.009337500
Notes:

Elevation (ft.)Depth (ft)Soil DriveIntervalSoil SampleIntervalPID (ppm)Unit/FormationGraphic LogUSCS CodeDepth (ft) 5 10
15 20
25 5
10 15
20 25
Well
Material Description Construction

Page 1 of 1 ends

Recovery
Key No Recovery
Core Recovery
Soil Sample
Packet Page 2204
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Appendices Ramboll

APPENDIX B

LABORATORY ANALYTICAL REPORTS
Packet Page 2205
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Appendices Ramboll

APPENDIX C

LOW-THREAT CLOSURE ASSESSMENT
Packet Page 2206
38288 – 38370 Cedar Boulevard, Newark, California
Appendix C: Low-Threat Closure Assessment
Appendix C A-1 Ramboll

APPENDIX C
Low-Threat Closure Assessment
Scenario 4 of the California SWRCB Low-Threat Closure Policy (SWRCB, 2012) was used to evaluate soil vapor data from soil vapor wells installed and sampled across the site. Scenario 4 of the SWRCB Low-Threat Closure Policy establishes low-threat soil vapor screening criteria for properties where existing or future buildings for human occupancy are planned and a bioattenuation zone can be demonstrated. Where a bioattenutation zone is demonstrated, the regulatory screening criteria (residential ESLs) for petroleum-related VOCs is multiplied by a factor of 1,000.

Scenario 4 criteria for demonstrating a bioattenuation zone include a maximum combined concentration of TPH-g and TPH-d of 100 mg/kg in soil and an oxygen concentration in soil vapor greater than or equal to 4% by volume. For soil, Ramboll evaluated soil samples that have TPH-g and TPH-d soil data from 0 to 5 feet bgs at or in the vicinity of soil vapor wells SV46 through SV50, SV51B, and SV52 through SV54 (see Table C.1 in this Appendix C). For soil vapor locations where soil samples were not collected directly from the soil vapor borehole during installation of the soil vapor well, 15 lateral feet was used as the threshold for shallow soil data in the vicinity of a soil vapor well.

The oxygen concentration in soil vapor samples collected in December 2020 from soil vapor wells SV46 through SV50, SV51B, and SV52 through SV54 is also presented in Table C.1.

None of the soil samples collected from less than 5 feet bgs and within 15 lateral feet of soil vapor wells SV46 through SV50, SV51B, and SV52 through SV54 have combined concentrations of TPH-g and TPH-d in excess of the 100 mg/kg threshold. The only soil vapor sample with an oxygen concentration less than 4% by volume was SV47. Therefore, the only soil vapor location that doesn’t demonstrate a bioattenuation zone Scenario 4 of the SWRCB Low-Threat Closure is SV47. However, the only VOC detected above reporting limits at SV47 is MTBE, and no VOCs were detected above residential ESLs at SV47 (Table 5).

Results of soil vapor sampling to date at soil vapor wells SV46, SV48 through SV50, SV51B, and SV52 through SV54 are provided in Table C.2 in this Appendix C. Consistent with Scenario 4 guidance, the residential ESLs for BTEX and MTBE in soil vapor was multiplied by a factor of 1,000.

When using the modified residential ESL values for BTEX and MTBE, the only detections above regulatory screening criteria in soil vapor samples collected to date at soil vapor wells SV46, SV48 through SV50, SV51B, and SV52 through SV54, is PCE and TCE in the December 2020 sample collected from SV52 (see Sections 3.7 and 4.9).

References:

California State Water Resources Control Board (SWRCB) 2012. Low-Threat Underground Storage Tank Case Closure Policy. January 31.

San Francisco Bay Regional Water Quality Control Board (SFRWQCB). 2019. Environmental Screening Levels. July. Rev 2.

Packet Page 2207
38288 – 38370 Cedar Boulevard, Newark, California
Appendix C: Low-Threat Closure Assessment
Appendix C A-2 Ramboll
TABLES C.1 AND C.2
Packet Page 2208
Table C.1: TPH in Shallow Soil Samples and Oxygen in Soil Vapor Samples Low-Threat Closure Policy
38288-38594 Cedar Boulevard, Newark, California
Soil Vapor
Well
Location
Nearby Soil
Boring
Location
Distance
Between
Vapor Well
and Boring
(in Feet)
Soil Sample
Depth
(feet bgs)
Soil Sample
Date TPH(g) TPH(d) TPH(g+d)
Oxygen + Argon
(by volume)
in Soil Vapor
Sample [1]
38288 Cedar Boulevard
SB29 10 4.0 12/16/2020 ND<1.0 ND<1.0 ND<2.0 7.8
38370 Cedar Boulevard
SB11 3 2.5 7/7/2015 ND<1.0 ND<1.0 ND<2.0 3.4
SB14 12 2.5 7/7/2015 ND<1.0 15 15 11
SB16 13 2.5 7/7/2015 ND<1.0 ND<1.0 ND<2.0 14
SB17 12 2.5 7/7/2015 ND<1.0 17 17 16
SV51B SB51B 0 4.0 12/16/2020 ND<1.0 ND<1.0 ND<2.0 14
38424 Cedar Boulevard
SB22 14 2.5 7/9/2015 ND<1.0 6.6 6.6 8.8
38486 Cedar Boulevard
SV54 SV54 0 4.0 12/16/2020 ND<1.0 ND<1.0 ND<2.0 8.2
38594 Cedar Boulevard
SV53 MW12 5 4.0 12/14/2020 ND<1.0 6.0 6.0 14
<100 ≥4%
Notes:

Compounds detected above the laboratory reporting limit are shown in bold.

All data are reported in milligrams per kilogram (mg/kg) unless noted otherwise.

Total petroleum hydrocarbons (TPH) analyzed by EPA Method 8015.

Oxygen + Argon analyzed as a fixed gas by ASTM 1946.
bgs = below ground surface
ND = not detected at or above the laboratory reporting limit shown SWRCB = State Water Resources Control Board
TPH(d) = total petroleum hydrocarbons diesel range (C10-C23) TPH(g) = total petroleum hydrocarbons gasoline range (C6-C12) TPH(g+d) = total petroleum hydrocrabons diesel range and gasoline range combined [1] Soil vapor samples collected in December 2020 (see Table C.2).

SV52
SV46
SV47
SV48
SV49
SV50
[2] Low-Threat Underground Storage Tank Case Closure Policy. Appendix 4. San Francisco Bay RWQCB, August 2012.

California SWRCB Low-Threat Underground Storage Tank Case Closure Policy - Bioattenuation Zone Criteria [2]

Page 1 of 3 ends

Packet Page 2209
Table C.2: Volatile Organic Compounds in Soil Vapor Samples Low-Threat Closure Policy
38288-38594 Cedar Boulevard, Newark, California
Location Sample ID
Sample
Date Acetone Benzene 2-Butanone
Carbon
Disulfide Chloroform
Dichlorodifluoro
methane
c-1,2-
Dichloroethene Ethylbenzene 4-Ethyltoluene o-Xylene p/m-Xylene 38288 Cedar Boulevard
SV46 [a] SV46-20190318 3/18/2019 12 ND<1.6 ND<4.4 28 3.8 ND<2.5 ND<2.0 ND<2.2 ND<2.5 ND<2.2 ND<8.7 SV46 [a] SV46-20201218 12/18/2020 12 ND<1.6 ND<4.4 ND<6.2 ND<2.4 2.5 ND<2.0 ND<2.2 ND<2.5 ND<2.2 ND<8.7 38370 Cedar Boulevard
SV48 [a] SV48-20190318 3/18/2019 -- -- -- -- -- -- -- -- -- -- -- SV48 [a] SV48-20201217 12/17/2020 ND<11.0 ND<3.8 ND<11.0 ND<15.0 ND<5.8 ND<5.9 ND<4.7 ND<5.2 ND<5.9 ND<5.2 ND<21.0 SV49 [a] SV49-20190315 3/15/2019 24 ND<1.6 ND<4.4 14 ND<2.4 ND<2.5 ND<2.0 ND<2.2 ND<2.5 ND<2.2 ND<8.7 SV49 [a] SV49-20201218 12/18/2020 30 ND<1.6 4.5 ND<6.2 ND<2.4 ND<2.5 ND<2.0 ND<2.2 ND<2.5 ND<2.2 ND<8.7 SV50 [a] SV50-20190315 3/15/2019 ND<4.8 940 ND<4.4 26 3.5 ND<2.5 ND<2.0 200 ND<2.5 ND<2.2 ND<8.7 SV50 [a] SV50-20201218 12/18/2020 6.2 ND<1.6 ND<4.4 ND<6.2 ND<2.4 ND<2.5 ND<2.0 ND<2.2 ND<2.5 ND<2.2 ND<8.7 SV51B [a] SV51B-20201218 12/18/2020 ND<13.0 ND<4.3 ND<12.0 ND<17.0 ND<6.6 ND<6.7 ND<5.4 7.7 15 16 25 38424 Cedar Boulevard
SV52 [a] SV52-20190318 3/18/2019 15 ND<1.6 ND<4.4 ND<6.2 2.7 ND<2.5 ND<2.0 ND<2.2 ND<2.5 ND<2.2 ND<8.7 SV52 [a] SV52-20201217 12/17/2020 12 ND<1.6 ND<4.4 ND<6.2 ND<2.4 ND<2.5 7.9 ND<2.2 ND<2.5 ND<2.2 ND<8.7 SV52 [a] SV52-20210120 1/20/2021 11 ND<1.6 ND<4.4 ND<6.2 ND<2.4 ND<2.5 ND<2.0 ND<2.2 ND<2.5 ND<2.2 ND<8.7 SV52 [a] SV152-20210120 1/20/2021 11 ND<1.6 ND<4.4 ND<6.2 ND<2.4 ND<2.5 ND<2.0 ND<2.2 ND<2.5 ND<2.2 ND<8.7 38486 Cedar Boulevard
SV54 [a] SV54-20201217 12/17/2020 48 23 9.0 19 6.3 3.2 2.0 7.9 ND<2.5 11 26 SV54 [a] SV154-20201217 12/17/2020 40 20 8.7 15 5.7 3.7 ND<2.0 7.1 ND<2.5 10 24 38594 Cedar Boulevard
SV53 [a] SV53-20190315 3/15/2019 ND<4.8 ND<1.6 ND<4.4 18 ND<2.4 ND<2.5 ND<2.0 ND<2.2 ND<2.5 ND<2.2 ND<8.7 SV53 [a] SV53-20201217 12/17/2020 16 ND<3.8 ND<11.0 ND<15.0 ND<5.8 ND<5.9 ND<4.7 ND<5.2 ND<5.9 ND<5.2 ND<21.0 1,000,000 3,200 170,000 -- 4.1 -- 280 37,000 -- 3,500,000 3,500,000 ESL Modified ESL ESL -- ESL -- ESL Modified ESL -- Modified ESL Modified ESL Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

All data are reported in micrograms per cubic meter (µg/m3).

Blue shading denotes detection above screening value.

Mobile lab samples analyzed by EPA Method 8260B.
[a] Summa canister sample analyzed by EPA Method TO-15.

Oxygen + Argon analyzed as a fixed gas by ASTM 1946.

RWQCB = Regional Water Quality Control Board
ESL = Environmental Screening Level
NA = Not Available
ND = not detected at or above the laboratory reporting limit shown VOC = volatile organic compound
[1] Environmental Screening Levels (ESLs). San Francisco Bay Regional Water Quality Control Board. Tier 1 ESLs. July 2019. [2] ESL multiplied by factor of 1,000 based on demonstration of bioattenuation zone (California State Water Resources Control Board [SWRCB] 2012.

Low-Threat Underground Storage Tank Case Closure Policy. January 31.) Screening Value for
Residential Land Use
Source [1] [2]

Page 2 of 3 ends

Packet Page 2210
Table C.2: Volatile Organic Compounds in Soil Vapor Samples Low-Threat Closure Policy
38288-38594 Cedar Boulevard, Newark, California
Location Sample ID
Sample
Date
Tetrachloroethene
(PCE) Toluene
Trichloroethene
(TCE)
Trichlorofluoro
methane 1,1,1-Trichloroethane 1,3,5-Trimethylbenzene 1,2,4-Trimethylbenzene Isopropanol Naphthalene Oxygen+Argon 38288 Cedar Boulevard
SV46 [a] SV46-20190318 3/18/2019 ND<3.4 ND<1.9 ND<2.7 ND<5.6 ND<2.7 ND<2.5 ND<7.4 ND<12 NA NA SV46 [a] SV46-20201218 12/18/2020 ND<3.4 ND<1.9 ND<2.7 ND<5.6 ND<2.7 ND<2.5 ND<7.4 28 ND<6.6 7.8% 38370 Cedar Boulevard
SV48 [a] SV48-20190318 3/18/2019 -- -- -- -- -- -- -- -- -- NA SV48 [a] SV48-20201217 12/17/2020 ND<8.1 ND<4.5 ND<6.4 ND<13.0 ND<6.5 ND<5.9 ND<18.0 ND<29.0 ND<16.0 11% SV49 [a] SV49-20190315 3/15/2019 3.5 23 5.2 ND<5.6 ND<2.7 ND<2.5 ND<7.4 ND<12 NA NA SV49 [a] SV49-20201218 12/18/2020 ND<3.4 2.6 ND<2.7 ND<5.6 ND<2.7 ND<2.5 ND<7.4 ND<12.0 ND<6.6 14% SV50 [a] SV50-20190315 3/15/2019 ND<3.4 9.8 ND<2.7 ND<5.6 ND<2.7 ND<2.5 ND<7.4 ND<12 NA NA SV50 [a] SV50-20201218 12/18/2020 ND<3.4 ND<1.9 ND<2.7 ND<5.6 ND<2.7 ND<2.5 ND<7.4 12 ND<6.6 16% SV51B [a] SV51B-20201218 12/18/2020 ND<9.2 ND<5.1 ND<7.3 ND<15.0 ND<7.4 16 26 ND<33.0 ND<18.0 14% 38424 Cedar Boulevard
SV52 [a] SV52-20190318 3/18/2019 ND<3.4 4.6 ND<2.7 ND<5.6 ND<2.7 ND<2.5 ND<7.4 ND<12 NA NA SV52 [a] SV52-20201217 12/17/2020 130 2.5 23 ND<5.6 ND<2.7 ND<2.5 ND<7.4 19 ND<6.6 6.3% SV52 [a] SV52-20210120 1/20/2021 ND<3.4 5.0 ND<2.7 ND<5.6 ND<2.7 ND<2.5 ND<7.4 17 ND<6.6 NA SV52 [a] SV152-20210120 1/20/2021 ND<3.4 3.8 ND<2.7 ND<5.6 ND<2.7 ND<2.5 ND<7.4 ND<12 ND<6.6 NA 38486 Cedar Boulevard
SV54 [a] SV54-20201217 12/17/2020 ND<3.4 27 4.9 34 48 ND<2.5 ND<7.4 ND<12.0 ND<6.6 8.2% SV54 [a] SV154-20201217 12/17/2020 ND<3.4 22 ND<2.7 29 48 ND<2.5 ND<7.4 57 ND<6.6 8.8% 38594 Cedar Boulevard
SV53 [a] SV53-20190315 3/15/2019 8.2 4.9 ND<2.7 ND<5.6 14 ND<2.5 ND<7.4 ND<12 NA NA SV53 [a] SV53-20201217 12/17/2020 ND<8.1 ND<4.5 ND<6.4 ND<13.0 13 ND<5.9 ND<18.0 ND<29.0 ND<16.0 14% 15 10,000,000 16 -- 35,000 -- -- -- 2.8 --
ESL Modified ESL ESL -- ESL -- -- -- ESL
Notes:

Only compounds detected above the laboratory reporting limit are included in the table; positive results are shown in bold.

All data are reported in micrograms per cubic meter (µg/m3).

Blue shading denotes detection above screening value.

Mobile lab samples analyzed by EPA Method 8260B.
[a] Summa canister sample analyzed by EPA Method TO-15.

Oxygen + Argon analyzed as a fixed gas by ASTM 1946.

Low-Threat Underground Storage Tank Case Closure Policy. January 31.) Screening Value for
Residential Land Use
Source [1] [2]

Page 3 of 3 ends

Packet Page 2211
Additional Investigation and Closure Report
38288 – 38370 Cedar Boulevard, Newark, California
Appendices Ramboll

APPENDIX D

ACWD WELL SURVEY
Packet Page 2212
Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

WELL IS JUST OFF THE WEST SHOULDER OF I-880; 10 FT. S.W. OF THE WEST EDGE OF THE ASPHALT OF I-800; 27 FT. N.E. OF THE NEIGHBORING PROPERTY LINE; 498 FT. S.E. OF THE S.E. SIDE OF THE CENTRAL AVE. OVERPASS. 4S/1W-31P001

CAL TRANS
3333 CALIFORNIA ST.

SAN FRANCISCO
Destroyed Geotechnical (monitoring)

2.000 in.

B-1.2-2
HWY 880 AT CENTRAL AVE.

30.0 ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

VALVEPOT IN ASPHALT DRIVEWAY.
4S/1W-31P002
MS. LYDIA BEAUPRE
2171 SHILO ST.

PORT CHARLOTTE
941-625-0942
Destroyed Chemical leak (monitoring)

2.000 in.

MW-1
5625 ROBERTSON AVE. NWK.

25.0 ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Location determined from Williams 1915 map.
4S/1W-31P003 Abandoned
in.

Willms #604
ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Location determined from Williams 1915 map.
4S/1W-31Q001 Abandoned
in.

Willms #605
ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Location determined from Williams 1915 map.
4S/1W-31Q002 Abandoned
in.

Willms #606
ft.

Latitude/Longitude:

This report is based on information in Alameda County Water District (ACWD) well records and is being furnished to the user for general information only. User understands that the information is furnished without any representation or warranty by ACWD that it is either complete or accurate or ACWD assumes no liability or responsibility for the use of the information.

Nearby Wells Report
5/6/2021 16:36

Page 1 of 17 ends

Within .25 miles of 5S/1W-06B
Packet Page 2213
Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Location determined from Williams 1915 map.
4S/1W-31Q003 Abandoned
in.

Willms #603
ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:
4S/1W-31R001 Status:

PACIFIC GAS & ELECTRIC
P.O. BOX 4605

HAYWARD
Active Cathodic protection
in.
25-1383
FARWELL DR. & SABIN AVE.
120.0 ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

WELL IN STEEL COVERED VAULT LOCATED 92 FT. N.W. OF S.E. FENCE-LINE, AND 12 FT. N.E. OF S.W. FENCE LINE 5S/1W-06A001
EMPIRE TRACTOR CO.
38600 CEDAR BLVD.

NEWARK
Active Chemical leak (monitoring)

2.000 in.

M-1
38600 CEDAR BLVD.

33.0 ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

WELL IN VALVEPOT LOCATED 123 FT. S.W. OF N.E. PROPERTY LINE FENCE, AND 46 FT. N.W. OF S.E. PROPERTY LINE FENCE 5S/1W-06A002
EMPIRE TRACTOR CO.
38600 CEDAR BLVD.

NEWARK
Active Chemical leak (monitoring)

2.000 in.

M-2
38600 CEDAR BLVD., NEWARK

33.0 ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

WELL IN VALVEPOT LOCATED 125 FT. S.W. OF N.E. PROPERTY LINE FENCE, AND 22 FT. N.W. OF S.E. PROPERTY LINE FENCE. 5S/1W-06A003
EMPIRE TRACTOR CO.
38600 CEDAR BLVD.

NEWARK
Active Chemical leak (monitoring)

2.000 in.

M-3
38600 CEDAR BLVD., NEWARK

34.0 ft.

Latitude/Longitude:

Nearby Wells Report
5/6/2021 16:36

Page 2 of 17 ends

Within .25 miles of 5S/1W-06B
Packet Page 2214
Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

WELL IN VALVEPOT LOCATED 103 FT. S.W. OF N.W. PROPERTY LINE FENCE, AND 32 FT. N.W. OF S.E. PROPERTY LINE FENCE 5S/1W-06A004
EMPIRE TRACTOR CO.
38600 CEDAR BLVD.

NEWARK
Active Chemical leak (monitoring)

2.000 in.

M-4
38600 CEDAR BLVD., NEWARK

35.0 ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

MW located in a valvepot in the sidewalk immediately West of the 38600 Cedar Blvd. in Newark. 5S/1W-06A005

NORTEX WEST
38600 CEDAR BLVD.

NEWARK
510-790-3600
Active Chemical leak (monitoring)

2.000 in.

MW-5
38600 CEDAR BLVD. NEWARK
2019423.231 N 6124578.693 E

22.0 ft.

Latitude/Longitude: 37° 31' 52.4893" N/ 122° 0' 26.7195" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well located in a valvepot in the sidewalk immediately West of 38600 Cedar Blvd. in Newark. 5S/1W-06A006

NORTEX WEST
38600 CEDAR BLVD.

NEWARK
510-790-3600
Active Chemical leak (monitoring)

2.000 in.

MW-6
38600 CEDAR BLVD. NEWARK
2019381.703 N 6124634.945 E

22.0 ft.

Latitude/Longitude: 37° 31' 52.0877" N/ 122° 0' 26.0129" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

MW-7 is locatd in a valvepot. MW-7 is located 90' NW freom Eastern most property fenceline and 11' north from southern (along Cedar Blvd.) property fenceline. 5S/1W-06A007

NORTEX WEST
38600 CEDAR BLVD.

NEWARK
510-790-3600
Active Chemical leak (monitoring)

8.000 in.

MW-7
38600 CEDAR BLVD. NEWARK

22.0 ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well MW-8 is an off site well. It is located in a planter strip along Cedar Blvd. MW-8 is located 260' SE from Moores Avenue centerline and 37' SW from Cedar Blvd. centerline.
5S/1W-06A008

NORTEX WEST
38600 CEDAR BLVD.

NEWARK
510-790-3600
Active Chemical leak (monitoring)

8.000 in.

MW-8
38600 CEDAR BLVD. NEWARK

22.0 ft.

Latitude/Longitude:

Nearby Wells Report
5/6/2021 16:36

Page 3 of 17 ends

Within .25 miles of 5S/1W-06B
Packet Page 2215
Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Location determined from Williams 1915 map.
5S/1W-06A009 Abandoned
in.

Willms #536
ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is located in a 6" round christy box at the southwest corner of the property 5S/1W-06A010
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

SV-1
38600 Cedar Blvd.
2019423.771 N 6124619.634 E

10.5 ft.

Latitude/Longitude: 37° 31' 52.5011" N/ 122° 0' 26.2113" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located at the bottom south west corner of Pape's rental and repairs parking lot. 5S/1W-06A011
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

[email protected]', SG-1@10'
38600 Cedar Blvd.
2019370.738 N 6124673.598 E

10.5 ft.

Latitude/Longitude: 37° 31' 51.9854" N/ 122° 0' 25.5308" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located in the south west portion of Pape's rental and repairs parking lot along south west fence. 5S/1W-06A012
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

[email protected]', SG-2@10'
38600 Cedar Blvd.
2019423.652 N 6124619.575 E

10.5 ft.

Latitude/Longitude: 37° 31' 52.4999" N/ 122° 0' 26.2120" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located at the bottom south west portion of Pape's rental and repairs parking lot along the fence. 5S/1W-06A013
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

[email protected]', SG-3@10'
38600 Cedar Blvd.
2019440.973 N 6124583.371 E

10.5 ft.

Latitude/Longitude: 37° 31' 52.6654" N/ 122° 0' 26.6649" W This report is based on information in Alameda County Water District (ACWD) well records and is being furnished to the user for general information only. User understands that the information is furnished without any representation or warranty by ACWD that it is either complete or accurate or ACWD assumes no liability or responsibility for the use of the information.

Nearby Wells Report
5/6/2021 16:36

Page 4 of 17 ends

Within .25 miles of 5S/1W-06B
Packet Page 2216
Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located in the south west portion of Pape's rental and repairs parking lot between the building and the fence. 5S/1W-06A014
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

[email protected]', SG-4@10'
38600 Cedar Blvd.
2019461.965 N 6124600.066 E

10.5 ft.

Latitude/Longitude: 37° 31' 52.8756" N/ 122° 0' 26.4619" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located in the south west portion of Pape's rental and repairs parking lot between the building and south west fence. 5S/1W-06A015
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

[email protected]', SG-5@10'
38600 Cedar Blvd.
2019439.764 N 6124634.412 E

10.5 ft.

Latitude/Longitude: 37° 31' 52.6616" N/ 122° 0' 26.0311" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy Box located in south west corner of Pape's rental and repairs parking lot. 5S/1W-06A016
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

[email protected]', SG-6@10'
38600 Cedar Blvd.
2019380.017 N 6124676.358 E

10.5 ft.

Latitude/Longitude: 37° 31' 52.0776" N/ 122° 0' 25.4984" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located in the south west portion of Pape's rental and repairs parking lot, just south of the southern corner of the building. 5S/1W-06A017
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

[email protected]', SG-7@10'
38600 Cedar Blvd.
2019414.729 N 6124664.256 E

10.5 ft.

Latitude/Longitude: 37° 31' 52.4188" N/ 122° 0' 25.6556" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located in the south west portion Pape's rental and repairs parking lot between the building south east side and the fence. 5S/1W-06A018
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

SG-8
38600 Cedar Blvd.
2019461.016 N 6124702.615 E

6.5 ft.

Latitude/Longitude: 37° 31' 52.8825" N/ 122° 0' 25.1887" W This report is based on information in Alameda County Water District (ACWD) well records and is being furnished to the user for general information only. User understands that the information is furnished without any representation or warranty by ACWD that it is either complete or accurate or ACWD assumes no liability or responsibility for the use of the information.

Nearby Wells Report
5/6/2021 16:36

Page 5 of 17 ends

Within .25 miles of 5S/1W-06B
Packet Page 2217
Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located in the south west portion Pape's rental and repairs parking lot between the building south east corner and the fence. 5S/1W-06A019
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

SG-9
38600 Cedar Blvd.
2019486.758 N 6124721.773 E

6.5 ft.

Latitude/Longitude: 37° 31' 53.1401" N/ 122° 0' 24.9560" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located in the south east portion Pape's rental and repairs parking lot north east of building's north east side. 5S/1W-06A020
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

SG-10
38600 Cedar Blvd.
2019577.338 N 6124712.466 E

6.0 ft.

Latitude/Longitude: 37° 31' 54.0340" N/ 122° 0' 25.0897" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located in the south east portion Pape's rental and repairs parking lot north east of building's north east side. 5S/1W-06A021
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

SG-11
38600 Cedar Blvd.
2019580.450 N 6124755.430 E

6.0 ft.

Latitude/Longitude: 37° 31' 54.0716" N/ 122° 0' 24.5569" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located in the south east portion Pape's rental and repairs parking lot north east of building along fence. 5S/1W-06A022
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

SG-12
38600 Cedar Blvd.
2019571.975 N 6124781.977 E

6.0 ft.

Latitude/Longitude: 37° 31' 53.9921" N/ 122° 0' 24.2257" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is within a 6'' Christy box located in the south east portion Pape's rental and repairs parking lot north east of building's north east side. 5S/1W-06A023
Ohana Land Company (Darcy Horton)
18581 Blythswood Drive
Los Gatos
831-588-7899
Active Vapor extraction
(monitoring)

0.250 in.

SG-13
38600 Cedar Blvd.
2019546.637 N 6124748.253 E

6.0 ft.

Latitude/Longitude: 37° 31' 53.7362" N/ 122° 0' 24.6393" W This report is based on information in Alameda County Water District (ACWD) well records and is being furnished to the user for general information only. User understands that the information is furnished without any representation or warranty by ACWD that it is either complete or accurate or ACWD assumes no liability or responsibility for the use of the information.

Nearby Wells Report
5/6/2021 16:36

Page 6 of 17 ends

Within .25 miles of 5S/1W-06B
Packet Page 2218
Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

S.W. CORNER OF CEDAR RD. & SMITH AVE.
5S/1W-06B001

SIMMONS
Destroyed Domestic

6.000 in.
ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:
5S/1W-06B002 Status:

PUBLIC STORAGE INC.
11828 DUBLIN BOULEVARD
DUBLIN
828-4805
Destroyed
in.

Willms #608
CEDAR BLVD. & SMITH STREET
ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:
5S/1W-06B003 Status:

TRINITY CHRISTIAN CENTER
P.O. BOX 303
NEWARK
Destroyed Geotechnical (monitoring)
in.

Willms #610
5608 SMITH AVE., NEWARK
ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Valvepot in dirt parking lot located 25 feet NW of NW wall of building and 260 feet NE of centerline of Cedar Blvd. 5S/1W-06B004

FRANK FREITAS
38370 CEDAR BLVD.

NEWARK
510-797-3553
Active Chemical leak (monitoring)

2.000 in.

MW-1
38370 CEDAR BLVD. NEWARK
2020301.264 N 6123655.039 E

25.0 ft.

Latitude/Longitude: 37° 32' 1.0222" N/ 122° 0' 38.3612" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

MW-2 located 215.00' south of the centerline of Cedar Blvd. and 108.00' west of the easterly fence property line 5S/1W-06B005

FRANK FREITAS
38370 CEDAR BLVD.

NEWARK
510-797-3553
Destroyed Chemical leak (monitoring)

2.000 in.

MW-2
38370 CEDAR BLVD. NEWARK
2020262.046 N 6123638.373 E

25.0 ft.

Latitude/Longitude: 37° 32' 0.6318" N/ 122° 0' 38.5602" W This report is based on information in Alameda County Water District (ACWD) well records and is being furnished to the user for general information only. User understands that the information is furnished without any representation or warranty by ACWD that it is either complete or accurate or ACWD assumes no liability or responsibility for the use of the information.

Nearby Wells Report
5/6/2021 16:36

Page 7 of 17 ends

Within .25 miles of 5S/1W-06B
Packet Page 2219
Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

MW-3 located 215.00' south of the centerline of Cedar Blvd and 133.00 west of the easterly fence/property line. 5S/1W-06B006

FRANK FREITAS
38370 CEDAR BLVD.

NEWARK
510-797-3553
Active Chemical leak (monitoring)

2.000 in.

MW-3
38370 CEDAR BLVD. NEWARK
2020272.426 N 6123617.960 E

25.0 ft.

Latitude/Longitude: 37° 32' 0.7312" N/ 122° 0' 38.8157" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well location determined from Williams Water Analyses Well Circuit Map 1923. 5S/1W-06B007 Abandoned
in.

Willms 1923 Dot
ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Location determined from Williams 1915 map.
5S/1W-06B008 Abandoned
in.

Willms #532
ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Location determined from Williams 1915 map.
5S/1W-06B009 Abandoned
in.

Willms #534
ft.

Latitude/Longitude:

Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Location determined from Williams 1915 map.
5S/1W-06B010 Abandoned
in.

Willms #535
ft.

Latitude/Longitude:

Nearby Wells Report
5/6/2021 16:36

Page 8 of 17 ends

Within .25 miles of 5S/1W-06B
Packet Page 2220
Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is located 285' North East of the Southern property boundary and 175' South East of the Western property boundary. GPS coordinates are available in SWMS. 5S/1W-06B011
Freitas Family Properties
38370 Cedar Blvd.

Newark
510-366-7980
Active Chemical leak (monitoring)

2.000 in.

MW-4
38288-38594 Cedar Blvd.
2020388.810 N 6123686.410 E

22.0 ft.

Latitude/Longitude: 37° 32' 1.8927" N/ 122° 0' 37.9893" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is located 137' North East of the southern property boundary and 231' South East of the western property boundary. 5S/1W-06B012
Freitas Family Properties
38370 Cedar Blvd.

Newark
510-366-7980
Active Chemical leak (monitoring)

2.000 in.

MW-5
38288-38594 Cedar Blvd.
2020232.800 N 6123649.347 E

18.0 ft.

Latitude/Longitude: 37° 32' 0.3445" N/ 122° 0' 38.4181" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is located 12' North East of the Southern property boundary and 287' South East of the Western property boundary. 5S/1W-06B013
Freitas Family Properties
38370 Cedar Blvd.

Newark
510-366-7980
Active Chemical leak (monitoring)

2.000 in.

MW-6
38288-38594 Cedar Blvd.
2020097.008 N 6123625.823 E

18.0 ft.

Latitude/Longitude: 37° 31' 58.9983" N/ 122° 0' 38.6829" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is located 31' North East of the southern property boundary and 175' South East of the western property boundary. GPS coordinates are available in SWMS. 5S/1W-06B014
Freitas Family Properties
38370 Cedar Blvd.

Newark
510-366-7980
Active Chemical leak (monitoring)

2.000 in.

MW-7
38288-38594 Cedar Blvd.
2020176.613 N 6123543.755 E

18.0 ft.

Latitude/Longitude: 37° 31' 59.7721" N/ 122° 0' 39.7177" W Well No:

Owner:

Address:

City:

Phone:

Location Description:

Use:

Casing Diameter:

Owner's Well No:

Well Address:

State Coordinates:

Depth:

Aquifer:

Status:

Well is located 108' North East of the southern property boundary and 115' South East of the western property boundary. GPS coordinates are available in SWMS. 5S/1W-06B015
Freitas Family Properties
38370 Cedar Blvd.

Newark
510-366-7980
Active Chemical leak (monitoring)

2.000 in.

MW-8
38288-38594 Cedar Blvd.
2020274.735 N 6123537.289 E

18.0 ft.

Latitude/Longitude: 37° 32' 0.7411" N/ 122° 0' 39.8176" W This report is based on information in Alameda County Water District (ACWD) well records and is being furnished to the user for general information only. User understands that the information is furnished without any representation or warranty by ACWD that it is either complete or accurate or ACWD assumes no liability or responsibility for the use of the information.

Nearby Wells Report
5/6/2021 16:36

Page 9 of 17 ends

Newark City CouncilMay 25, 2023

Newark City Council
May 25, 2023