El Centro City Council
May 7, 2024

Public Improvement Projects (city projects)
Continued:
• All plans shall show existing monuments on the
individual sheets and include the general Note
“A” as shown on Sheet 3 of 4 of this information
bulletin (unless included in the contract
specifications) or, include a monumentation
map within the plan set showing all the
monuments within the project limits.
• When using a monumentation map you must
include the applicable note on the plan set. See
Note “C” on Sheet 4 of 4 of this information
bulletin.
• All public works contracts that will disturb
monuments shall include monument
perpetuation in the scope of work.
• The surveyor, shall reference all monuments to
be affected by construction. Upon completion
and acceptance of new improvements, the
surveyor shall reset any monuments that have
been destroyed due to the construction of the
project and file a Corner Record or Record of
Survey with the County Surveyor.
• If a contractor disturbs or destroys a monument
without notice to the surveyor, the contractor
shall be responsible for the cost of reestablishing the position of the monument. A private land surveyor shall be hired for the
surveying associated with re-setting the
monument(s).

Post process review (city projects)
• A project is not complete and will not be closed
until the Corner Record(s) or Record of Survey
is filed with the County.

Land Development Projects, Building and
Right of Way Encroachment Permits
(Private Projects)
• The applicant or their designated design
professional shall coordinate with a
professional land surveyor to ensure Business
and Professions Code § 8771 is adhered to.
• A private land surveyor shall research, recover
and document all existing monuments prior to
any disturbance, demolition or construction. A
pre-construction Corner Record or Record of
Survey shall be filed with the County
Surveyor and a copy given to the Community
Development Services or Public Works Engineering
staff issuing the permit. The surveyor shall also sign
the monument preservation certificate.
• All private improvement plans, grading plans,
construction plans and building plans shall show
existing monuments. A separate monument sheet
may be included in the plan set for clarity purposes.

All plans need to include Note “B” as shown on
Sheet 3 of 4 of this information bulletin.
• A private land surveyor shall, upon completion of
new improvements, reset any monuments that have
been destroyed due to the construction of the project
and must file a post-construction Corner Record or
Record of Survey with the County Surveyor.
• A hold will be placed on the final inspection for all right of way encroachment permits and other types
of permits that affect survey monuments. When city
surveyors receive confirmation of the filing of the
post-construction Corner Record or Record of
Survey from the private surveyor, the hold will be
released and final inspection can be performed.

Post process review (Private projects)
• A project will not be accepted until all Corner
Records or Records of Survey are filed with the
County Surveyor by the private surveyor and
submitted to the City Engineer for review. Upon
acceptance, any hold associated with the monument
acceptance of the project will be cleared.

• The applicant or their contractor shall notify the
Engineering Inspector or Building Inspector when
the monuments have been replaced and a postconstruction corner record has been filed prior to final sign-off. The Engineering Inspector or
Building Inspector will then contact the city
permitting office to clear the hold related to
monument acceptance.

8.a
Packet Pg. 1070 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

Note “A” - Public Improvement Projects (city project) Note:

THE CONTRACTOR SHALL BE RESPONSIBLE FOR ANY MONUMENTATION AND/OR BENCHMARKS WHICH WILL BE DISTURBED OR DESTROYED BY CONSTRUCTION. SUCH POINTS SHALL BE

REFERENCED AND REPLACED WITH APPROPRIATE MONUMENTATION BY A LICENSED LAND SURVEYOR OR A REGISTERED CIVIL ENGINEER AUTHORIZED TO PRACTICE LAND SURVEYING. A

CORNER RECORD OR RECORD OF SURVEY, AS APPROPRIATE, SHALL BE FILED BY THE LICENSED

LAND SURVEYOR OR CIVIL ENGINEER AS REQUIRED BY THE PROFESSIONAL LAND SURVEYORS ACT (BUSINESS AND PROFESSIONS CODE SECTION 8771).

Note “B” - Land Development Projects, Building, Grading and Right of Way Encroachment Permits:

THE PERMITTEE SHALL BE RESPONSIBLE FOR THE COST OF REPLACING ALL SURVEY MONUMENTS DESTROYED BY CONSTRUCTION. IF A VERTICAL CONTROL MONUMENT IS TO BE DISTURBED OR DESTROYED, THE CITY ENGINEER’S OFFICE SHALL BE NOTIFIED IN WRITING AT LEAST 7 DAYS PRIOR TO DEMOLITION/CONSTRUCTION.

□ THE TYPE OF CONSTRUCTION PROPOSED WILL NOT AFFECT ANY SURVEY MONUMENTS (this line is for projects that are proposing no demolition, trenching, associated with a CIP, etc.)

___________________________________________________________________

NAME DATE

PRIOR TO PERMIT ISSUANCE, THE PERMITTEE SHALL RETAIN THE SERVICE OF A PROFESSIONAL

LAND SURVEYOR OR CIVIL ENGINEER AUTHORIZED TO PRACTICE LAND SURVEYING WHO WILL BE

RESPONSIBLE FOR MONUMENT PRESERVATION AND SHALL PROVIDE A CORNER RECORD OR

RECORD OF SURVEY TO THE COUNTY SURVEYOR AS REQUIRED BY THE PROFESSIONAL LAND SURVEYORS ACT, IF APPLICABLE. (SECTION 8771 OF THE BUSINESS AND PROFESSIONS CODE OF THE

STATE OF CALIFORNIA)

I HAVE INSPECTED THE SITE AND DETERMINED THAT:
□ NO SURVEY MONUMENTS WERE FOUND WITHIN THE LIMITS OF WORK □ SURVEY MONUMENTS EXISTING IN OR NEAR LIMITS OF WORK WILL BE PROTECTED IN PLACE
□ SURVEY MONUMENTS HAVE BEEN TIED OUT AND A FINAL OR PARCEL MAP WILL BE FILED (No Corner Record or Record of Survey will be required) □ OTHER AGENCY SURVEY MONUMENT (Corner Record or Record of Survey may not be required). Agency has been notified of possible monument destruction and a letter provided to City. □ A PRE-CONSTRUCTION CORNER RECORD (OR RECORD OF SURVEY) FOR SURVEY MONUMENTS FOUND WITHIN THE LIMITS OF WORK HAS BEEN FILED.

CORNER RECORD#_________________ OR RECORD OF SURVEY#__________________ _____________________________________________________________________________ NAME P.L.S. XXXX / R.C.E. XXXXX DATE

Post Construction Corner Record (As-Built item)
□ POST CONSTRUCTION CORNER RECORD FOR SURVEY MONUMENTS DESTROYED DURING CONSTRUCTION AND REPLACED AFTER CONSTRUCTION.

CORNER RECORD#________________ OR RECORD OF SURVEY# ___________________ ______________________________________________________________________________ NAME P.L.S. XXXX/ R.C.E. XXXXX DATE

8.a
Packet Pg. 1071 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

NOTE “C” - TO BE PLACED ON A MONUMENTATION MAP—
Capital Improvement Program (CIP) Projects and Public Improvement Projects

THIS MAP WAS CREATED FROM A PARCEL LAYER AND DOES NOT DEPICT THE ACTUAL LOCATION OF THE PROPERTY LINES. NO BOUNDARY ANALYSIS WAS PERFORMED. THE

SURVEY MONUMENTS HAVE BEEN LOCATED BY SURVEY GRADE MEASUREMENTS, AND ARE SHOWN FOR INFORMATIONAL PURPOSES ONLY.

A LICENSED LAND SURVEYOR SHALL BE RETAINED TO REPLACE SUCH MONUMENTS WITH APPROPRIATE MONUMENTS. WHEN SETTING SURVEY MONUMENTS USED FOR REESTABLISHMENT OF THE DISTURBED CONTROLLING SURVEY MONUMENTS AS REQUIRED BY SECTION 8771 OF THE BUSINESS AND PROFESSIONS CODE OF THE STATE OF

CALIFORNIA, A CORNER RECORD OR RECORD OF SURVEY, AS APPROPRIATE, SHALL BE FILED WITH THE COUNTY SURVEYOR.

IF ANY HORIZONTAL OR VERTICAL CONTROL IS TO BE DISTURBED OR DESTROYED, THE

RETAINED LICENSED LAND SURVEYOR SHALL BE NOTIFIED IN WRITING PRIOR TO CONSTRUCTION. THE CONTRACTOR SHALL BE RESPONSIBLE FOR THE COST OF

REPLACING ANY HORIZONTAL CONTROL AND VERTICAL CONTROL BENCHMARKS DESTROYED BY THE CONSTRUCTION. THE FILING OF A CORNER RECORD OR RECORD OF SURVEY, AS APPROPRIATE SHALL BE FILED WITH COUNTY SURVEYOR. A COPY OF THE FILED DOCUMENT SHALL BE FURNISHED TO THE CITY OF EL CENTRO’S CITY ENGINEER.

8.a
Packet Pg. 1072 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Appendix G
Underground Classification Requirements and
Application

8.a
Packet Pg. 1073 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Rev. 01/2019
STATE OF CALIFORNIA GAVIN NEWSOM, Governor

DEPARTMENT OF INDUSTRIAL RELATIONS

DIVISION OF OCCUPATIONAL SAFETY AND HEALTH

MINING AND TUNNELING UNIT
Underground Classification Requirements
Under California law, all tunnels (except horizontal directional drilling, which is at District Manager’s discretion), underground chambers, and excavations, and all pipejacking and boring projects 30 inches or greater in diameter, are required to be Classified by the Division prior to bidding. This requirement is provided for in California Labor Code, Section 7955 [http://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml], and Title 8 of the California Code of Regulations, Section 8422 [http://www.dir.ca.gov/title8/8422.html].

In order to proceed with classifying any underground projects, we require the following information:

1. The complete name and mailing address of the owner of the completed facility or structure.

2. The physical location and size (outside diameter and overall length) for each tunnel.

Note: Location should either be a street address or the distance from nearest street intersection.

Example: The 42-inch-diameter, 280-feet-long tunnel bore located beneath the Union Pacific Railroad tracks, approximately 1,500 feet northeast of the intersection of Third Street and Highland Avenue, Oakland, Alameda County.

3. One copy of half-size plan and profile drawings showing the relationship and identity of any existing utilities.

4. One copy of any geological information and/or soils reports that are proximate to, or representative of, the conditions existing at the site of the underground construction work, especially as they relate to the presence of flammable gases and hydrocarbons.

5. Any current or past use of the surface area which may have caused contamination of the soils by fuels, oils, solvents, or other chemicals such as: gas stations; auto body and paint shops; industrial and agricultural fuel tanks; chemical manufacturing and processing facilities, etc.

6. Location of any utilities in the area.

Please provide the copies of your plan and profile drawings, pertinent geological reports and logs, a statement on past historical use, and any other factors bearing on the possibility of encountering flammable or toxic gases in the area where the underground construction activity is being undertaken.

Additional Information
 Please mail or deliver your classification request (most are too large for our email server), and address your request to the office located closest to the project, not to a specific individual.  Provide contact name, company/agency, telephone number, mailing address, and email address.  We try to respond within two weeks; it may be longer depending on workload.  We do not charge a fee for an underground classification. However, if a Permit to Use Diesel Equipment Underground is required, the fee is $50 (payable to “State of California”). Contact this office for information regarding diesel permits.
 Mining & Tunneling Unit, District 1  Mining & Tunneling Unit, District 2  Mining & Tunneling Unit, District 3 6150 Van Nuys Blvd., Suite 310 464 West Fourth Street, Suite 354 Van Nuys, California 91401-3333 San Bernardino, California 92401-1442 1750 Howe Avenue, Suite 450
Sacramento, California 95825-2400
(916) 574-2540; FAX: (916) 574-2542 (818) 901-5420; FAX: (818) 901-5579 (909) 383-6782; FAX: (909) 388-7132

8.a
Packet Pg. 1074 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

Request for Underground Classification
Owner:

Representative:

Telephone:

Mailing Address:

Project Name
Number of Bores
Description and
Dimensions of
completed bore(s)
Street address (or
direction and distance
from a fixed mark);
City (or closest
incorporated area);
County
List any significant
underground utilities;
other potential
impediments; or other
information

OFFICE USE ONLY
Classified by:

Classification:

Project Type / Size:

Assigned to:

Classification No:

8.a
Packet Pg. 1075 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Appendix H
Dewatering Evaluation and Geotechnical
Engineering Support

8.a
Packet Pg. 1076 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and
Geotechnical Engineering Support
Southern Pump Station,
El Centro, California
Nicklaus Engineering, Inc.

November 29, 2022

8.a
Packet Pg. 1077 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
Prepared for:

Nicklaus Engineering, Inc.
1851 W. 24th Street, Suite 101
Yuma, AZ 85364
Attention: Antonio Alvarez
AECOM
401 West A Street, Suite 1200
San Diego, CA 92101
aecom.com
November 29, 2022
AECOM Project No: 60687863
Subject: Dewatering Evaluation and Geotechnical Engineering Support Southern Pump Station, El Centro, California
AECOM Technical Services, Inc. (AECOM) is pleased to provide Nicklaus Engineering, Inc. (NEI) this report of geotechnical engineering support at the proposed Southern Pump Station, El Centro. As outlined in our proposal dated June 8, 2022 this geotechnical study supplements a previous geotechnical investigation by Geotechnics (2007) with additional information for groundwater conditions for construction dewatering at the pump station and for sewer installation. Analytical laboratory testing was performed on groundwater samples extracted from the monitoring wells that were constructed for this study. The geotechnical evaluations included trenchless evaluations of proposed crossings of Imperial Irrigation District (IID) water and drain facilities and below the Union Pacific Railroad. These trenchless pipeline installations are currently proposed using jack-and-bore installation. As described this report, pipe jacking appears to be the most economic and appropriate method for the trenchless crossings.

Please reach out to us if you have any questions or comments on the information presented herein.

Yours sincerely,
Steven M. Fitzwilliam, PE, GE
Principal Geotechnical Engineer,
GeoEngineering
AECOM
D 619.610.7800 C 619.871.7524
[email protected]
David L. Schug, CEG, CHG
Senior Principal Geologist, GeoEngineering
AECOM
D 1-619-610-7667 C 1-619-888-0512
[email protected]

8.a
Packet Pg. 1078 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
This page intentionally left blank.

8.a
Packet Pg. 1079 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
i
Table of Contents
Cover Letter

1. Introduction ............................................................................................................. 1

1.1 Project Description ............................................................................................................................. 1

1.2 Purpose and Scope of Work ............................................................................................................... 1

2. Geotechnical Investigation ...................................................................................... 2

2.1 Previous Investigations ....................................................................................................................... 2

2.2 Geotechnical Borings ......................................................................................................................... 2

2.3 Groundwater Sampling & Analysis ...................................................................................................... 2

2.4 Geotechnical Laboratory Testing ......................................................................................................... 2

2.5 Analytical Testing................................................................................................................................ 2

3. Site and Geologic Conditions .................................................................................. 3

3.1 Geologic Setting ................................................................................................................................. 3

3.2 Surface Conditions ............................................................................................................................. 3

3.3 Subsurface Conditions........................................................................................................................ 3

3.4 Groundwater ...................................................................................................................................... 3

4. Geotechnical Considerations .................................................................................. 4

4.1 Construction Dewatering .................................................................................................................... 4

4.1.1 Anticipated Soil Conditions ..................................................................................................... 7

4.1.2 Groundwater Conditions ......................................................................................................... 8

4.1.3 Preliminary Evaluations for Groundwater Disposal and Possible Treatment .............................. 8

4.2 Trenchless Construction Options ...................................................................................................... 12

4.2.1 Microtunneling ...................................................................................................................... 12

4.2.2 Pipe Jacking......................................................................................................................... 13

4.2.3 Access Shafts ...................................................................................................................... 14

4.3 Other Considerations ........................................................................................................................ 15

4.3.1 Instrumentation and Monitoring ............................................................................................. 15

4.3.2 Muck Disposal ...................................................................................................................... 15

5. General Conditions and Limitations ...................................................................... 17

6. References ............................................................................................................ 18

8.a
Packet Pg. 1080 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
ii
Figures
Figure 1. Vicinity Map ................................................................................................................ 19 Figure 2. Site Plan .................................................................................................................... 20 Figure 3. Cross Section A-A’ ..................................................................................................... 21 Figure 4. Cross Section B-B’ ..................................................................................................... 22 Figure 5. Cross Section C-C’ ..................................................................................................... 23 Figure 6. Cross Section D-D’ ..................................................................................................... 24 Tables
Table 1. Anticipated Subsurface Conditions – Sewer and Force Main ......................................... 5 Table 2. Anticipated Subsurface Conditions – Trenchless Crossings ........................................... 6 Table 3. Slug Testing Summary ................................................................................................... 8 Table 4. Summary of Screening Levels for Water Quality ............................................................ 9 Table 5. Recommended Asphalt Pavement Sections ................................................................ 15 Appendices
A Previous Borings
B Field Investigation
C Geotechnical Laboratory Testing
D Analytical Test Results

8.a
Packet Pg. 1081 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
1 1. Introduction
AECOM Technical Services, Inc. (AECOM) and Nicklaus Engineering, Inc. (NEI) prepared this report of geotechnical engineering support at the proposed Southern Pump Station, El Centro.

The construction plans for the Southern Pump Station dated March 2021, were prepared by PSOMAS for the City of El Centro (City). We understand PSOMAS, the Engineer, has requested this geotechnical/dewatering evaluation to reduce subsurface construction uncertainty, particularly with respect to groundwater.

1.1 Project Description
The City of El Centro plans on installing a new pump station and approximately 12,000 feet of sewer pipe as shown on the project plans prepared by PSOMAS1. The project location is shown on Figure 1. The pump station wet well will be approximately 36 feet below grade. The sewer pipelines will include a 12 inch diameter force main and gravity lines varying from 8 to 21 inches in diameter. The sewer will be installed using typical cut and cover methods, with jack and bore methods proposed below the Union Pacific railroad (UPRR) tracks and several Imperial Irrigation District (IID) pipeline and canal crossings. The approximate layout of the pipeline pump station and proposed crossings is shown on Figure 2. Refer to the construction drawings for more detailed information.

1.2 Purpose and Scope of Work
This geotechnical study supplements a previous geotechnical investigation by Geotechnics (2007) with additional information for groundwater conditions at the pump station and for sewer installation, which will require construction dewatering due to the shallow groundwater table based on previous borings.

Geotechnical and dewatering evaluations presented in this report are to provide supplemental information to the contractors to aid with dewatering design by the contractor. As described below, the supplemental geotechnical investigation included additional test borings at the proposed pump station and along the pipeline route. Monitoring wells were completed in the borings for groundwater sampling, in-situ permeability (“slug”) testing and to collect groundwater level data. Samples of groundwater were analyzed for potential constituents of concern generally as outlined for water quality monitoring in the Imperial Irrigation District Drain Water Quality Plan. The field and laboratory information were evaluated to assess options for trenchless construction. Pavement recommendations are provided for Danenberg Road. 1 PSOMAS, Construction Plans City of El Centro Southern Pump Station, submitted March 2021

8.a
Packet Pg. 1082 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
2 2. Geotechnical Investigation

2.1 Previous Investigations
The project design was based on the previous geotechnical investigation report for the project performed by Geotechnics (2007). Approximate locations of previous borings, including five (5) borings and eight (8) CPTs, drilled to depths between 20 and 50 feet bgs are shown on Figure

2. Logs of previous borings are included in Appendix A.

2.2 Geotechnical Borings
The current field investigation consisted of four (4) hollow stem auger borings drilled to depths between 31.5 and 51.5 feet bgs. Borings were located following review of utilities, site conditions, traffic and safety. Borings were not allowed within IID easements therefore borings were limited to City of El Centro public right of way. Approximate locations are shown on Figure

2. Logs of the borings are included in Appendix B.

2.3 Groundwater Sampling & Analysis
The borings were completed as 2-in diameter polyvinyl chloride (PVC) monitoring wells with factory slotted screen, sand filter pack, an upper bentonite-cement grout seal and protective cover. The well screens were placed at or near the bottom of the boring; approximate 10- to 20-foot screen lengths were used, depending on subsurface conditions. Monitoring well construction details are shown on the boring logs, Appendix B.

Field permeability “slug” tests were performed in the completed wells by AECOM geotechnical personnel. The test data were analyzed for hydraulic conductivity using spreadsheets and recovery curves using several well recognized procedures, described in Appendix B.

2.4 Geotechnical Laboratory Testing
Relatively undisturbed soil samples were recovered at 5-foot intervals and sample were tested in the NEI geotechnical laboratory. Several shallow soil samples were collected along the Danenberg Road at the proposed road grade for R-value tests. Test results are shown on the corresponding sample location on the logs of the borings in Appendix B. Laboratory test results are provided in Appendix C.

2.5 Analytical Testing
After the monitoring wells were developed and purged, groundwater samples were collected for analysis. Samples were collected with a submersible pump or bailer. Samples were analyzed at Eurofins analytical laboratory for potential contamination and other constituents in general accordance with water quality analyses required of dischargers as outlined in the Imperial Irrigation District Drain Water Quality Plan. Analytical test results are provided in Appendix D.

Test results indicating screening level exceedances are summarized below.

8.a
Packet Pg. 1083 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
3 3. Site and Geologic Conditions

3.1 Geologic Setting
The site area is underlain by ancient lake bed deposits within Lake Cahuilla, a prehistoric lake in California and northern Mexico. The ancient lake filled with the Salton Trough, a thick sequence of sediment filled a subsiding basin which now forms a broad flat depression with ground surface elevations below Mean Sea Level. The alluvial sediment sequence is likely many hundreds of feet thick below the project area.

3.2 Surface Conditions
The project area is mostly flat within residential development, agricultural and open space land bordered by Highway 86 and the Union Pacific Railroad. Existing roads have unimproved shoulders. Existing utilities include overhead electrical power lines and buried utilities as shown on the drawings. IID has existing below ground pipelines along with the Date Drain a series of open cut channels (ditches). Land surface elevations range between about -25 and -30 feet below MSL.

3.3 Subsurface Conditions
The alluvial soils (also described as lacustrine or lake bed deposits) encountered in the borings generally consisted of a fine-grained layered sequence with variable thickness of clay, sandy silt and silty sand. The clay layers were most dominant including soft to very stiff silty clay and fat clay (CL- and CH-type soil). Stiff to very stiff sandy silt (ML-type soil) was also encountered. The silt was described as cohesive. Medium dense silty sand layers (SM-type soil) appeared less pervasive; few lenses of sand were encountered in the borings. Geotechnics (2007) also noted some silty and sandy granular soils were encountered in their borings but the sands were less prevalent.

3.4 Groundwater
All of the borings encountered groundwater at depths between 11 and 17 feet bgs. Groundwater levels may have some variability due to precipitation and other man-made factors, discussed below.

8.a
Packet Pg. 1084 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
4 4. Geotechnical Considerations
Geotechnical design and construction recommendations including shoring, foundations, backfill and other criteria were provided by Geotechnics (2007). It is currently proposed to use jack and bore installations at the railroad and all IID crossings, seven under crossings in total. Casing will be required at all the proposed under crossings, as shown on the drawings. The casing will be designed to withstand railroad loads at the UPRR crossing. Based on the borings, construction dewatering will be required due to the shallow groundwater table over the site area.

4.1 Construction Dewatering
For dewatering evaluations, key geotechnical information needs are 1) depth to groundwater, 2) soil type and 3) hydraulic conductivity (permeability, determined by slug testing). These data were evaluated for the sewer pipelines as shown on Tables 1 and 2.

Excavation depths for the open trench sections are anticipated to range between 13 feet bgs up to as much as 22 feet bgs. According to Geotechnics (2007), water depths should be lowered 3 feet below the excavation bottom to provide a firm base for bedding2. All excavations will be shored.
2 Pipe bedding and backfill details are shown on Detail D, Sheet C-24

8.a
Packet Pg. 1085 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
5 Table 1. Anticipated Subsurface Conditions – Sewer and Force Main Reach Approximate Pipeline
Station
Approximate
Pipeline Reach
Length (feet)
Relevant Borings
(depth, ft bgs)
Approximate
Bottom of
Pipeline
(depth, ft
bgs)
Approximate
Depth to
Groundwater
(feet bgs)
Anticipated
Soil Types
(generalized,
within
excavation
depth)
Relevant
Geologic Profile
Reference Plan
Sheet Nos.

Pump Station N/A N/A B-1 (51)
MW-2 (51.5) 36 (wet well) 12 (MW-2) CL, CH Section A-A’ M-2 W Danenberg
Drive
10+00 to 34+30
(west of pump station) 2,400
B-1 (51)
B-4 (31)
MW-2 (31.5)
19-22 12 (MW-2) CL, CH Section A-A’
Section D-D’ C-1, C-2, C-3
E Danenberg
Drive
Sewer
65+00 to 88+25
(east of pump station)
2,325
B-1 (51)
B-2 (31)
CPT-7
MW-2 (51.5) MW-3
(31.5)
15-22
12 (MW-2)
16 (MW-3)
CL, CH, SM Section A-A’ C-4, C-5, C-6
Force Main
10+29 to 33+15 2,286 6-9 Cl, CH Section A-A’ C-11, C-12, C-13 Farnsworth Lane 10+00 to 43+29
(south of pump station 3,329
CPT-5
MW-1 (31.5)
MW-2 (51.5)
16-22 15 (MW-1)
12 (MW-2) CL, CH, ML Section A-A’Section C-C’
C-16, C-17, C-18,
C-19
Beverly Lane 10+00 to 25+24 1,524 B-3 (26.5)
MW-4 (31.5) 18-20 11 (MW-4) CL, CH, SM Section B-B’ C-7, C-8, C-9, Desert Trails
Park Easement
to Wake Avenue
10+00 to 31+99 2,199 B-4 (31)
B-5 (32) 13-20 13 (B-3)
15 (B-4)
CH, ML Section D-D’ C-21, C-22, C-23

8.a
Packet Pg. 1086 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
6 Table 2. Anticipated Subsurface Conditions – Trenchless Crossings Under Crossing
Casing
Diameter
(Minimum
ID, inches)
per Sheet
C-24
Approximate
Pipeline
Station
Approximate
Pipeline
Reach
Length (feet)
Relevant
Boring
(depth, ft
bgs)
Approximate
Bottom of
Pipeline
(at center, feet
bgs)
Approximate
Depth to
Groundwater
(feet bgs)
Estimated
Saturated
Soil
Thickness
(feet)
Anticipated
Soil Type
(at pipeline
depth)
Relevant
Geologic
Profile
Reference
Plan Sheet
Number(s)
New 21” sewer
Crossing under ex
48” pipe
(Date Drain #3)
30 11+67 to
12+27 60 B-1 (51)MW-2 (52) 21.5 12 9.5 CL, CH Section AA’ C-1 Union Pacific RR
Crossing
20 Sewer
72+31 to
73+61
130 B-1 (51) 22 13 9

SM, CL-CH
Mixed Face
possible
Section AA’ C-4
20 Force Main
72+31 to
73+61
130 B-1 (51) 12 Above
groundwater
Not
anticipated CL-CH Section AA’ C-4
New 12” Sewer
Crossing under ex
30” pipe
(Date Drain #3)
18 22+47 to
22+88 40 CPT-5 (30)MW-1 (31.5) 19 15 4 ML Section CC’ C-17 New 12” Sewer
Crossing under ex
36” pipe
(Date Drain #3)
18 35+94 to
36+34 40 CPT-5 (30)MW-1 (31.5) 19 15 4 ML Section CC’ C-18 New 8” Sewer
Crossing under ex
36” pipe
(Date Drain #3)
16 10+27 to
10+53 25 CPT-5 (30)MW-1 (31.5) 17 15 2 ML Section CC’ C-20 New 18” Sewer
Crossing under ex
60” Pipe
(Date Drain #3D)
24 25+29 to
26+07 80 B-3 (26.5)MW-4 (31.5) 18 11 7
ML, SM
Mixed Face
possible
Section BB’ C-9

8.a
Packet Pg. 1087 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
7 As shown on Table 1, groundwater control will be predominantly in stiff clays and cohesive silt with few layers of silty sand. The force main excavation may be mostly above groundwater. The relatively shallow depths to be dewatered and anticipated fine-grained soil conditions appear locally favorable for open pumping (“sump well systems”) where water is collected in sumps and pumped away for open trench construction areas. These conditions generally include:
 Stiff clays with few lenses of sand which are not connected to a significant water source,  Low to moderate dewatering head (ranging between a few feet up to about 10 feet),  Low to moderate hydraulic conductivity (between about 1x10-4 and 1x10-3 cm/sec, see Table 3 below),
 Backhoe or excavator operation from the ground surface,  Relatively flat slopes, and
 Excavation support (shoring) will be required which may reduce groundwater flow depending on the shoring method used.

Some conditions may be relatively unfavorable for open pumping, thereby pre-drainage with wells and/or cut off of flow from the excavation may be advisable. Such conditions may include:
 Excavations made proximate to source of recharge, potentially such as IID canals when carrying sustained flow,
 Soldier beams and lagging, where excavations of a vertical face to place lagging boards could be difficult or dangerous under lateral flow conditions,  Adjacent structures and/or existing utilities that could be endangered by soil sloughing, and  Other conditions that may warrant pre-drainage or cut-off.

Well point systems are effective in a wide range of soils including pumping a few gallons per minute in fine sandy silts or substantially more in coarse sands and gravels.

Local reaches of the sewer excavation and some Tunneling Pits (access shafts) may require wells, especially excavations where the dewatering head is close to 10 feet or more. The proposed wet well at the pump station is approximately 36 feet bgs. Groundwater was measured in MW-2 at approximately 12 feet bgs. Groundwater may need to be lowered on the order of 24 feet in clayey soil for construction of the wet well. This effort likely requires dewatering with wells.

Based on the subsurface information provided and the subsurface permeability from the slug tests, the contractor should evaluate the dewatering rates and volumes required. In addition, the contractor should evaluate the water treatment that may be required to meet discharge requirements. Analytical test results are discussed below.

4.1.1 Anticipated Soil Conditions
Subsurface soil conditions are fine-grained soils, mostly stiff clays (CL and CH-type soil) with only few sand layers or lenses. Moisture content of the mostly cohesive silt was near or above the liquid limit, which suggests seepage pressures could pose instability problems in the trench excavations. The adjacent slopes are nearly flat and can probably support moderate seepage without becoming unstable. None of the soil layers within the borings would appear to be “hard” or “impervious”.

8.a
Packet Pg. 1088 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
8 The alluvial soils penetrated by the wells appear to have low to moderate hydraulic conductivity, generally consistent with silt and silty sand, based on the slug tests (Appendix B). Table 3 summarizes soil hydraulic conductivity (K) based on the slug tests.

Table 3. Slug Testing Summary
Monitoring Well K Values Soil Type
MW-1 2.3 to 2.9 ft/day Silt (ML), sandy silt (ML), silty sand (SM)

1.0E-03 to 8.1E-04 cm/sec
MW-2 0.29 to 0.46 ft/day Silty clay (CL-CH)

1.0E-04 to 1.6E-04 cm/sec
MW-3 1.37 to 1.46 ft/day Silty clay (CL-CH)

4.8E-04 to 5.2E-04 cm/sec

4.1.2 Groundwater Conditions
The depth to groundwater is estimated to range between 11 and 16 feet bgs, as shown on Tables 1 and 2. The alluvial aquifer is unconfined in the shallow subsurface with sustained recharge possible from relatively remote sources over a broad area of the basin. Artesian conditions were not suggested by the slug test responses. There appear to be no “hard” or confining layers within the depths explored (about 51.5 feet bgs).

The pipeline trench excavations will be parallel to and within about 50 feet of existing open cut ditches along the Date Drain. Depending on channel flow, the IID ditches may be a contributing source of seepage during construction. The excavations also pass through subdivision irrigation that could contribute to shallow seepage and below ground utilities may be leaking.

4.1.3 Preliminary Evaluations for Groundwater Disposal and Possible Treatment
Analytical laboratory testing was performed on groundwater samples extracted from the monitoring wells. The City of El Centro requested water quality analyses performed per “General Waste Discharge Requirements, Low Threat Discharges to Surface Waters, within the Colorado River Basin”3. Accordingly analyses were performed generally per Attachment B, Table B-1 “Screening Levels for Conventional and Non-Conventional Pollutants” and Table B-2 “Screening Levels for Priority Pollutants” of the NPDES Order.

A complete summary of analyses is shown in Tables B-1 and B-2 in Appendix D. Note that Tables B-1 and B-2 are duplicated from the Order. Analytical lab reports by Eurofins are provided in Appendix D.

Table 4 summarizes sample analyses that exceeded screening levels for Municipal and/or Non-Municipal Designated Waters per the Order. Additional sampling may be required to determine the upstream receiving water for hardness (per Order Table B-3). Potential treatment options and other considerations are provided on Table 4. 3 California Regional Water Quality Board, Colorado River Basin Region, Order R7-2015-0006 NPDES NO.

CAG99700t

8.a
Packet Pg. 1089 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
9 Table 4. Summary of Screening Levels for Water Quality Test parameter above
screening level
Screening
Level that was
exceeded
Where Screening
Level Exceedance
Occurred (test result)
Comments/Observations Typical treatment(s) and other
approaches that may be applicable
Total Suspended Solids 95 mg/L MW-1 (1260 mg/L)
MW-2 (16900 mg/L)
MW-3 (896 mg/L)
MW-4 (1380 mg/L)
Fine-grained alluvial sediment was difficult
develop out of the wells prior to sampling. As a
result the samples were turbid and required
filtration by the lab.

Settling/clarification may be needed
to reduce suspended solids. Settled
solids would form a sludge that would
need to be removed periodically.

Total Petroleum
Hydrocarbons (TPH)

0.1 mg/L (100
µg/L)
MW-4 (0.4 mg/L) TPH exceeded the screening level at one well.  Oil/water separation  Settling/clarification
 Air stripping
Metals and Other Compounds
Arsenic Municipal and
Non-Municipal
Designated
Waters (50 and
36 µg/L,
respectively)
MW-2 (58.6 µg/L) Arsenic is fairly pervasive in natural soils.

While concentrations found in surface soil
cannot be directly related to groundwater, it is
noteworthy that surface soil samples collected
from the area near El Centro (University of
California, 1996) showed average Arsenic
concentrations of 4.2 mg/L (ppm) or about
4200 µg/L.
 pH adjustment
 Coagulation flocculation
 Settling/clarification
 Filtration
Mercury Municipal and
Non-Municipal
Designated
Waters (0.050
and 0.051 µg/L,
respectively)
MW-1 (0.18 µg/L)
MW-2 (0.167 µg/L)
MW-3 (0.192 µg/L)
MW-4 (0.161 µg/L)
Although mercury occurs naturally in the
environment, concentrations of mercury can
exceed background levels because of human
activities that includes their potential use as a
pesticide on cotton.

Selenium Municipal
Designated
Waters (5 µg/L)
MW-1 (23.9 µg/L)
MW-2 (161 µg/L)
MW-3 (34 µg/L)
MW-4 (13.3 µg/L)
Screening levels for Non-Municipal
Designated Waters were not exceeded (71
µg/L)
Thallium Municipal and
Non-Municipal
Designated
Waters (1.7 and

6.3 µg/L,
respectively)
MW-2 (7.82 µg/L) Thallium is fairly pervasive in natural soils (see note for Arsenic). Surface soil samples
collected from the area near El Centro
(University of California, 1996) showed
average Thallium concentrations of 0.60 mg/L
(ppm) or about 600 µg/L.

8.a
Packet Pg. 1090 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
10 Test parameter above
screening level
Screening
Level that was
exceeded
Where Screening
Level Exceedance
Occurred (test result)
Comments/Observations Typical treatment(s) and other
approaches that may be applicable
Cadmium, Copper,
Lead and Zinc
May exceed
screening levels
depending on
Water Hardness
MW-1 (Lead 23.5 µg/L)
MW-2 (Cadmium 11
µg/L, Copper 149 µg/L,
Lead 141 µg/L and Zinc
414 µg/L)
Additional sampling may be required to
determine the upstream receiving water for
hardness (per Order Table B-3).

Semi-Volatile Organics
Bis(2-
Ethylhexyl)Phthalate
Municipal and
Non-Municipal
Designated
Waters (1.8 and

5.9 µg/L,
respectively
MW-2 (9.7 µg/L) Phthalates are prevalent in the environment because of their use in plastics like PVC.

Bis(2-ethylhexyl)phthalate is a semi-volatile
organic compound (SVOC) that is also known
as di-(2-ethylhexyl) phthalate, and DEHP, a
fairly common sampling contaminant.
 Filtration
 Granular activated charcoal
adsorption
Additional sampling may show the
constituent detected may be an
artifact of the sampling and analysis
procedures (in other words, a false
exceedance) because no other
SVOCs were detected.

Pesticides and PCBs
alpha-Endosulfan Exceeded
Municipal and
Non-Municipal
Designated
Waters (0.056
and 0.0087 µg/L,
respectively)
MW-2 (0.33 µg/L) MW-4
(0.58 µg/L)
Endosulfan is an organochlorine insecticide
and acaricide that is commonly used in the US
for agricultural pest control.

Reverse osmosis that incorporates
activated carbon filters.

Dieldrin Exceeded
Municipal and
Non-Municipal
Designated
Waters (0.0014
and 0.0014 µg/L,
respectively
MW-1 (0.0015 µg/L) Dieldrin was widely used as pesticides for crops like corn, cotton, and citrus fruit from the
1950s until 1970.

Additional sampling recommended to
verify localized, only minor
exceedance of dieldrin.

8.a
Packet Pg. 1091 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
11 Test parameter above
screening level
Screening
Level that was
exceeded
Where Screening
Level Exceedance
Occurred (test result)
Comments/Observations Typical treatment(s) and other
approaches that may be applicable
Other constituent
Asbestos Exceeded
Municipal and
Non-Municipal
Designated
Waters (7MFL)
MW-3 (50MFL) This result is based on the detection of one (1) fiber of the asbestos mineral Tremolite which
is a pervasive constituent in many rocks and
soil.

Reverse osmosis filtration

8.a
Packet Pg. 1092 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
12 Receiving waters (i.e., discharge points) are not known at this time. Additional sampling may be required to determine the upstream receiving water for hardness. We anticipate sampling results presented in this report could be compared to Screening Levels for Hardness-Dependent Priority Pollutant Metals (Table B-3 of the Order) when receiving waters are defined. Table B-2 (Appendix D) provides a preliminary assessment based on assumed receiving water hardness levels.

Some discharges may need minimal treatment, such as settling out sediment or dechlorination, in order to remove specific pollutants prior to discharge and/or application of Best Management Practices (BMPs) to ensure that the discharge does not create conditions of pollution or nuisance.

4.2 Trenchless Construction Options
We compiled anticipated trenchless conditions (anticipated ground conditions, installation diameter, and drive lengths) per Table 2. The proposed trenchless crossings for the sewer pipeline are beneath IID canals or pipelines and at the UPRR crossing (sewer and force main).

The proposed trenchless crossings range between about 25 and 130 feet long (longest at the UPRR crossing). Casing ranging between 16 and 30 inches is required at all of the trenchless crossings. Details are shown on the drawings by PSOMAS.

The proposed trenchless crossings all have similar ground conditions in the subsurface. The Tunnelman’s ground behavior (Heuer, 1974) in the anticipated stiff clayey soils may range from “firm” to “raveling” although soil behavior at the face will depend on seepage. The ground conditions at trenchless depths are expected to be mostly stiff or cohesive, with perhaps moderate seepage at the face. However, if fine sands or silty sands are present, even small inflows could cause “running” ground. Several crossings may have “mixed face” conditions, i.e., partly in sand and partly in clay. There appear to few cemented or hard layers that would pose alignment problems.

Trenchless options include horizontal directional drilling (HDD), microtunneling and jack and bore which are some methods used to install small diameter pipelines. All these methods vary in the way they bore, for example horizontal directional boring is carried out at an angle from the surface while other methods utilize entry and exit pits dug to the depth of pipe ingress.

In our opinion HDD installation would be difficult for the relatively short trenchless lengths proposed, and some dewatering would still be required at the entrance and exit points. Many of the crossings are too space constrained for HDD. We considered other trenchless methods using jack and bore with some measure of “built-in” groundwater control namely:
1) microtunneling and 2) pipe jacking, discussed below.

4.2.1 Microtunneling
This is a pipe jacking method utilizing a closed face, accurately guided, remote controlled microtunnel boring machine (MTBM) which supports the ground and ground water by exerting slurry and face pressure. Microtunneling is generally undertaken from shaft to shaft located at each end of the drive. The jacking shaft allows for a drive in two directions with smaller retrieval shafts at the end of the drives. Shafts are constructed to a depth just below the required pipe invert. Dewatering would be required at the shafts, but not along the trenchless alignment.

Typically MTBM working diameters of 30-in outside diameter are possible which would accommodate the larger casing size required for 21-inch pipe. The required smaller diameter casing sizes and relatively short drive lengths may not be within the normal operating range for

8.a
Packet Pg. 1093 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
13 this system, and thereby may not be cost-effective. A schematic microtunneling diagram is presented below.

4.2.2 Pipe Jacking
The Drawings include the requirements for casing installation (ahead of the carrier pipe) at each trenchless crossing. We suggest considering using Auger Boring and/or Pipe Ramming construction methods for the installation of casing. With the use of a Pilot Tube4 these methods are known as “Jack-and-Bore Guided Pass Methods”.

Auger Boring is a jack and bore method of installing a steel casing pipe where the steel pipe is advanced by pipe jacking while simultaneously excavating the ground at the face and continuously transporting the material back to the starting shaft by a continuous flighted auger.

Initially the small diameter pilot tube is pushed through the ground with no soil removal or dewatering. The auger bore (attached to the casing) follows the pilot tube removing soil. The carrier pipe is then installed in the casing. Auger boring is applicable for crossings through clays, silts and consolidated sand and gravel above the water table. Below the groundwater may be possible and is limited by ground type or depth below groundwater (see Table 2). If flowing or running sand is encountered there could be ground loss at the face which could pose settlement problems. Therefore alignment dewatering should be assumed.

Pipe Ramming is a method of installing steel casing where the steel pipe is advanced by a pneumatic hammer unit acting on the end of the pipe, as the pipe advances through the ground the material is ingested into the inside of the steel pipe to be removed later normally at the completion of the drive. Pipe ramming is applicable for shorter crossings and possibly up to 150 feet in the anticipated silt, clay and sand. As shown on Table 2, the estimated pipe depth below groundwater ranges between about 2 and 10 feet. It’s possible dewatering could be reduced for the shorter alignments. Some alignment dewatering should be assumed.

Pilot tube guidance may be used for both methods if required for alignment and grade control purposes. The pilot tube itself does not require dewatering. For either method, the contractor will still need to provide positive groundwater control at the Tunneling Pits when launching or 4 Pilot Tube Guided Boring method (PTGBM) is a multi-stage method of accurately installing a product pipe to line and grade by use of a guided pilot tube and followed by upsizing to install the product pipe. The system must use a guidance system to insure accuracy.

8.a
Packet Pg. 1094 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
14 retrieving boring machines from starting and receiving pits to maintain excavation support and to prevent seepage and loss of ground.

In our opinion, pipe jacking appears to be the most economic and appropriate method for the proposed trenchless crossings. However, the contractor should evaluate the dewatering and discharge cost considering the anticipated subsurface conditions. If the Contractor proposes to install casings using an alternate method suitable for the existing subsurface conditions, and capable of meeting the specified tolerances, a complete submittal of the methods and materials should be made, subject to the approval of the Engineer.

A schematic pipe-jacking operation is presented below.

4.2.3 Access Shafts
Trenchless crossings will require construction access shafts, locations of Tunneling Pits are shown on the drawings. Details for the shaft construction are not available. We anticipate construction of the shafts would be handled with contractor submittals during construction.

Possible shaft construction methods would include drilled soldier pile and timber lagging support or a round shaft of bolted steel segment rings and ring beams or temporary box shoring. Sealed shaft methods of Secant piles or Cast in Situ RC Caisson sinking methods are also possible.

The upper portions of proposed tunneling pits will pass through possible unstable fill and alluvium above groundwater, but this ground is likely to have low water flows and stand for a period of time and may not require a sealed shaft method.

Shaft dewatering will be required in the saturated alluvium below the groundwater table.

Estimated dewatering depths at the trenchless crossings range between about 2 and 10 feet bgs, as shown on Table 2. The quantity and flow of the water at the tunnel invert and shaft base is dependent on the contractor’s construction method and may require dewatering or grouting to reduce water flow to an acceptable level. The commitment to dewatering will need to be made in advance to permit construction of wells, initiate drawdown, evaluate performance of the system, and augment the system as needed.

8.a
Packet Pg. 1095 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
15 4.3 Other Considerations

4.3.1 Instrumentation and Monitoring
Settlement is the primary source of potential damage to street utilities and other structures during tunnel construction. Settlement can result from over excavation due to loss of ground at the tunnel heading, steering adjustments, and other effects. Empirical methods are available and could be provided to estimate magnitudes of surface settlement due to the soft ground tunneling.

Existing conditions should be documented prior to construction. This could consist of a reconnaissance and survey of pavement, sidewalk, structures and any other improvements within 100 feet of the pipeline alignment centerline. The reconnaissance survey will serve as an aid in evaluating possible damage due to settlement resulting from the tunneling operations.

The survey system of vertical control should be established prior to construction and elevation should be surveyed periodically during construction and according to IID and railroad requirements, if applicable.

4.3.2 Muck Disposal
Disposal of excavated soil may have high water content, possibly including free water. For the soil to be re-used as structural fill may require processing to reduce its water content to near optimum.

4.4 Pavement Recommendations
The structural design of flexible asphalt concrete (AC) pavement depends primarily on anticipated traffic conditions, subgrade soils, and construction materials. Near-surface soils were tested in the laboratory; thus, an R-Value of 10 was assumed for pavement recommendations. We have evaluated pavement structural sections for a range of loadings that correspond with Traffic Indices (TI) of 7.5 and 9.0. The project civil engineer should evaluate an appropriate TI. Based on our experience we recommend a TI of 7.5 for residential roads that are not heavily trafficked and a TI of 9.0 for areas with higher anticipated traffic. Based on the assumed loadings and R-Value of 10, recommended pavement structural sections are presented in Table 5 below.

Table 5. Recommended Asphalt Pavement Sections
Traffic Index Recommended Asphalt
Concrete Thickness (in)
Recommended Class 2
Aggregate Base Thickness
(in)

7.5 5.0 15.0

7.0 11.0

9.0 6.0 18.0

8.0 15.0
Note:

1. An R-Value of 10 was assumed for pavement section recommendations.

The recommended pavement sections assume properly prepared subgrade consisting of at least 12 inches of subgrade soils compacted to a minimum of 95 percent relative compaction,

8.a
Packet Pg. 1096 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
16 using the latest version of ASTM D1557 as the compaction standard. The AC and Class 2 Aggregate Base (AB) materials should be placed and compacted to a minimum relative compaction of 95 percent. Construction materials (AC and Class 2 AB) should conform to the current Standard Specifications for Public Works Construction (Green Book) or the construction standards of the City of El Centro. We recommend that a qualified geotechnical professional observe and test the compaction of subgrade, AB, and AC materials.

8.a
Packet Pg. 1097 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
17 5. General Conditions and Limitations
Geotechnical engineering and the geological sciences require interpretations based on limited subsurface data. Relatively small portion of the pertinent soil and groundwater conditions along the proposed tunnel alignments have been observed. The recommendations made herein assume that soil and groundwater conditions will not deviate appreciably from those found during our field investigation. Professional judgment discussed herein is based on an understanding of the proposed construction and partly on general experience. Actual subsurface conditions encountered during construction will likely vary from those discussed in this report. If variations in subsurface conditions are encountered during construction NEI/AECOM should be consulted for further recommendations.

8.a
Packet Pg. 1098 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
18 6. References
Bouwer H., Rice R.C. (1976) A slug test for determining hydraulic conductivity of unconfined aquifers with completely or partially penetrating wells. Water Resources Research, 12 (3):
423-428.

California Regional Water Quality Board, Colorado River Basin Region, Order R7-2015-0006 NPDES NO. CAG99700t “General Waste Discharge Requirements, Low Threat Discharges to Surface Waters, within the Colorado River Basin”.

Geotechnics Inc., 2007, report of preliminary geotechnical investigation southern regional pump station El Centro CA, prepared for Nolte 078-012-00
Heuer, R.E., 1974, “Important Ground Parameters in Soft Ground Tunneling” in Subsurface Explorations for Underground Excavation and Heavy Construction, ASCE, New York.

Powers, J.P., and others, 2007, Construction Dewatering and Groundwater Control, Third Edition, John Wiley and Sons, Inc.

PSOMAS, construction plans city of El Centro Southern pump station, submitted March 2021 University of California, 1996, Background Concentrations of Trace and Major Elements in California Soils, Kearney Foundation of Soil Science, Division of Agriculture and Natural Resources

8.a
Packet Pg. 1099 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

VICINITY MAP

SOUTHERN PUMP STATION

EL CENTRO, CALIFORNIA
DRAWN BY: EJV
PM: DS
FIG. NO.:
1 DATE: 10/21/2022
PROJ. NO. 60648961

8.a
Packet Pg. 1100 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

KEY MAP & IID CROSSINGS
LEGEND
Section
B-B’
Section
C-C’
CPT-6
CPT-5
B-1 B-2
CPT-7 CPT-8
CPT-4
CPT-3
B-3
B-4
B-5
CPT-1 CPT-2
MW-4
MW-2
MW-1
MW-3
B-1
CPT-7
MW-1
Approximate CPT location (Geotechnics, 2007)
Approximate Boring location (Geotechnics, 2007)
Approximate Boring location (NEI, 2022)
Section
A-A’ Approximate Cross Section
CROSS SECTIONS A-A’, B-B’ & C-C’ ARE SHOWN ON FIG 3
Section
A-A’

SITE PLAN

SOUTHERN PUMP STATION

EL CENTRO, CALIFORNIA
DRAWN BY: EJV
PM: DS
FIG. NO.:
2 DATE: 10/21/2022
PROJ. NO. 60648961
8 CROSS SECTION A-A’

SOUTHERN PUMP STATION

EL CENTRO, CALIFORNIA
DRAWN BY: EJV
PM: DS
FIG. NO.:
3 DATE: 10/21/2022
PROJ. NO. 60648961
MW-2
(NEI, 2022)
Fill
CH
CL
CH
B-2
(Geotech, 2007)
Fill
CL/CH
SM
CL/CH
B-1
(Geotech, 2007)
CHContinues
o of page
Continues
o of page
Continues
o of page
CL
CL-CH
CH
Lean Clay (CL)
Fill
Lean Clay to Fat Clay (CL/CH)
Silty Sand (SM)
Fat Clay (CH)
Depth to water (ATD)
LEGEND 8
South
North
North South
Silt (ML)
Depth to water (ATD)
LEGEND
Silty Sand (SM)
Lean Clay (CL)
Fill
Lean Clay to Fat Clay (CL/CH)
Fat Clay (CH)
MW-4
(NEI, 2022)
Fill
CL-CH
ML
MW-4
(NEI, 2022)
Fill
CL-CH
CL-CH
ML
ML
SM
Fill
CH
ML
Continues
o of page
CL
CROSS SECTION B-B’

SOUTHERN PUMP STATION

EL CENTRO, CALIFORNIA
DRAWN BY: EJV
PM: DS
DATE: 10/21/2022 FIG. NO.:

PROJ. NO. 60648961
8 Silt (ML)
Depth to water (ATD)
LEGEND
CL-CH
MW-1
(NEI, 2022)
CH
CL-CH
ML
SM
Silty Sand (SM)
CPT-5
(Geotech, 2007)
Silty Sand
Sand Mix
Silt Mix
Silty Clay
Sandy Silt
Silty Clay
Clay
Sandy Silt
Sand
Silt Mix
Sandy Silt
Lean Clay (CL)
Fill
Lean Clay to Fat Clay (CL/CH)
Fat Clay (CH)
CH
CL-CH
CL-CH
CROSS SECTION C-C’

SOUTHERN PUMP STATION

EL CENTRO, CALIFORNIA
DRAWN BY: EJV
PM: DS
FIG. NO.:
3 DATE: 10/21/2022
PROJ. NO. 60648961
8 B-5 (Geotechnics, 2007)
B-4 (Geotechnics, 2007)
CROSS SECTION D-D’

SOUTHERN PUMP STATION

EL CENTRO, CALIFORNIA
Fig 6
CROSS SECTIOND-D’

SOUTHERN PUMP STATION

EL CENTRO, CALIFORNIA

8.a
Packet Pg. 1105 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
A-1
Appendix A
Previous Borings
Approximate locations of previous borings performed by Geotechnics (2007), including five (5) borings and eight (8) CPTs, drilled to depths between 20 and 50 feet bgs are shown on Figure

2. Logs of previous borings are included in this Appendix.

8.a
Packet Pg. 1106 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1107
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1108
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1109
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1110
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1111
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1112
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1113
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1114
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1115
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1116
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1117
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1118
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1119
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1120
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1121
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1122
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1123
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1124
Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
B-1
Appendix B
Field Explorations
The current field investigation consisted of four (4) hollow stem auger borings. Borings were located following review of utilities, site conditions and safety. The borings were not allowed within IID easements and were limited to City of El Centro public right of way. Approximate locations are shown on Figure 2. Logs of the borings are included in this Appendix.

The borings were drilled by Pacific Drilling to depths between about 30 feet bgs and up to 51.5 feet bgs at the pump station. Using a truck-mounted drill rig. Soil cuttings were drummed on site and moved to the pump station site for characterization and disposal. The soil was characterized as non-hazardous and was properly disposed offsite.

The borings were completed as 2-in diameter polyvinyl chloride (PVC) monitoring wells with factory slotted screen, sand filter pack, an upper bentonite-cement grout seal and protective cover. The well screens were placed at or near the bottom of the boring; approximate 10- to 20-foot screen lengths were used, depending on depth to groundwater. Monitoring well construction details are shown on the boring logs, this Appendix.

The wells were developed by pumping, surging and bailing to begin the action of dewatering by pulling in groundwater to the well. Groundwater samples were collected after several well casing volumes were removed and the water began to clarify. Stabilized groundwater levels were measured in the monitoring wells. The monitoring wells were fitted with protective locking covers then left in place. The wells are available for additional sampling and/or monitoring, if needed.

AECOM/NEI assume the wells will be properly destroyed by the contractor as part of the project construction.

Field permeability “slug” tests were performed in the completed wells by AECOM geotechnical personnel. A weighted, capped length of PVC pipe (i.e., the “slug”) was lowered into the well, providing the sudden change in water level. We used a data recording transducer to monitor the water level response, both with the slug below water, and after removing the slug (after levels have recovered). We were not able to test MW-4 due to the limited depth of water within the well. The test data were analyzed for hydraulic conductivity using spreadsheets and recovery curves using several well recognized procedures, summarized in Appendix B.

8.a
Packet Pg. 1125 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
B-2
Slug Tests Results
The purpose of the slug testing is to analyze the local hydraulic conductivity (K) of saturated water-bearing units. Slug testing involves inducing an instantaneous change to the water level in a well and then measuring the water levels over time. The rate at which the water level returns to a previously measured static water level is governed by the hydraulic properties of the materials across which the well is screened. Slug testing is accomplished by rapidly lowering or raising a solid cylinder (slug) into the well to displace a known volume of water. A nylon rope is attached to the slug to lower and raise it within the well. Both “slug-in” (falling head) and “slugout” (rising head) displacements are recorded for the tests. Slug tests were performed in the completed wells by AECOM geotechnical personnel. The test data were analyzed for hydraulic conductivity using spreadsheets and recovery curves using several well recognized procedures.

Slug Testing K-Calculation Hvorslev Summary
10/24/2022
K Values Parameters
MW-1D Slug-in 3.3E-05 ft/sec r=R= 0.0833

2.883 ft/day L= 15

1.017E-03 cm/sec t0= 36

87.871 cm/day
Slug-out 2.669E-05 ft/sec r=R= 0.0833

2.306 ft/day L= 15

8.136E-04 cm/sec t0= 45

70.296 cm/day
MW-2C Slug-in 5.372E-06 ft/sec r=R= 0.0833

0.464 ft/day L= 20

1.637E-04 cm/sec t0= 177

14.146 cm/day
Slug-out 3.384E-06 ft/sec r=R= 0.0833

0.292 ft/day L= 20

1.031E-04 cm/sec t0= 281

8.911 cm/day
MW-3B Slug-in 1.692E-05 ft/sec r=R= 0.0833

1.462 ft/day L= 15

5.157E-04 cm/sec t0= 71

44.554 cm/day
Slug-out 1.581E-05 ft/sec r=R= 0.0833

1.366 ft/day L= 15

4.817E-04 cm/sec t0= 76

41.623 cm/day

8.a
Packet Pg. 1126 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

8.a
Packet Pg. 1127 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and CLIENT City of El Centro
PROJECT NUMBER 020-0401.00001
PROJECT NAME Southern Pump Station
PROJECT LOCATION El Centro, CA

ABBREVIATIONS
TV
PID
UC
ppm
-
-
-
-

TORVANE

PHOTOIONIZATION DETECTOR

UNCONFINED COMPRESSION

PARTS PER MILLION
LIQUID LIMIT (%)
PLASTIC INDEX (%)
MOISTURE CONTENT (%)

DRY DENSITY (PCF)

NON PLASTIC
PERCENT PASSING NO. 200 SIEVE

POCKET PENETROMETER (TSF)
LL
PI
W
DD
NP
-200
PP
-
-
-
-
-
-
-
Bentonite Seal: 1 pipe group, 1 pipe
Blank section
Filter Pack: 1 pipe group, 1 pipe
Filter Pack: Bottom of hole
No Backfill (just pipe): 1 pipe group, 1
pipe
Pipe Cap: 1 pipe group, 1 pipe
Slotted Pipe: 1 pipe group, 1 pipe
Auger Cuttings
Modified California Sampler
No Recovery
Standard Penetration Test

LITHOLOGIC SYMBOLS SAMPLER SYMBOLS
(Unified Soil Classification System)
CH: USCS High Plasticity Clay
CL: USCS Low Plasticity Clay
CL-CH: USCS Low to High Plasticity Clay
CLS: USCS Low Plasticity Sandy Clay
ML: USCS Silt
MLS: USCS Sandy Silt
SM: USCS Silty Sand

WELL CONSTRUCTION SYMBOLS

KEY TO SYMBOLS
Water Level at Time
Drilling, or as Shown
Water Level After 24
Hours, or as Shown
Water Level at End of
Drilling, or as Shown KEY TO SYMBOLS - GINT STD US LAB.GDT - 10/19/22 17:32 - C:\USERS\CCHASE\DESKTOP\020-0401.00001 CITY OF EL CENTRO SOUTHERN PUMP STATION.GPJ Nicklaus Engineering
1851 W. 24th Street
Yuma, Arizona 85364
Telephone 928-344-8374
Fax 928-726-6994

8.a
Packet Pg. 1128 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) AU
MC
1 SPT
2 MC
3 SPT
4 MC
5 SPT
6 NR
-27.0
-35.0
-40.0
-45.0
-50.0
-56.5
80 100
70 70
100
100
4-8-11
(19)
0-0-2
(2)
4-9-12
(21)
3-3-5
(8)
18-35-50
(85)
7-12-8
(20)
6-5-8
(13)
MC = 21%
DD = 113 pcf
LL = 54
PL = 22
Fines = 98%
MC = 24%
Fines = 90%
MC = 24%
DD = 101 pcf
MC = 27%
LL = 10
PL = 8
Fines = 96%
MC = 21%
DD = 108 pcf
Groundwater
encountered at 15
ft. Total Depth =

31.5 ft.

2.0 10.0

15.0 20.0

25.0 31.5
Silty CLAY (CL-CH) - light brown, moist, soft to
medium stiff, wet, low to medium plasticity, mottled.

Fat CLAY (CH) - brown mottled, wet, very stiff,
waxy, high plasticity, oxidation mottled.

Fat CLAY (CH) - brown mottled, wet, very soft, high
plasticity, waxy, oxidation mottled, trace caliche.

Silty CLAY (CL-CH) - grayish-brown mottled, wet,
very stiff, medium plasticity, trace oxidation mottled.

SILT (ML) - light brown mottled, wet to saturated,
medium stiff, nonplastic, trace very fine-grained
sand, trace oxidation mottled, free water in
sampler.

Sandy SILT (ML) - light orangish-brown, wet to
saturated, hard, very fine-grained sand, laminated,
nonplastic.

Silty SAND (SM) - light brown, wet to saturated,
medium dense, very fine-grained.

Bottom of borehole at 31.5 feet.

Cap
Medium
Chips
Bentonite
Seal
2" Blank
Section
#3 Sand Pack
2" 0.020"
Slotted Pipe
#3 Sand Pack
NOTES 32.76024, -115.54341
GROUND ELEVATION -25 ft

LOGGED BY CCC
DRILLING METHOD Hollow Stem Auger
DRILLING CONTRACTOR Pacific Drilling GROUND WATER LEVELS:

CHECKED BY AA
DATE STARTED 8/23/22 COMPLETED 8/23/22
AT TIME OF DRILLING 15.00 ft / Elev -40.00 ft

AT END OF DRILLING --- AFTER DRILLING ---
HOLE SIZE 8 inches SAMPLE TYPE NUMBER DEPTH (ft)
0 5
10 15
20 25
30 PAGE 1 OF 1
WELL NUMBER MW-1
CLIENT City of El Centro
PROJECT NUMBER 020-0401.00001
PROJECT NAME Southern Pump Station
PROJECT LOCATION El Centro, CA GENERAL BH / TP / WELL - GINT STD US LAB.GDT - 10/19/22 17:51 - C:\USERS\CCHASE\DESKTOP\020-0401.00001 SERVER\020-0401.00001 CITY OF EL CENTRO SOUTHERN PUMP STATION.GPJ Nicklaus Engineering
1851 W. 24th Street
Yuma, Arizona 85364
Telephone 928-344-8374
Fax 928-726-6994 RECOVERY % BLOW COUNTS (N VALUE) TESTS AND

REMARKS GRAPHIC LOG

MATERIAL DESCRIPTION
Casing Top Elev: -25 (ft)
Casing Type: PVC

WELL DIAGRAM

8.a
Packet Pg. 1129 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) AU
SPT
1 AU
MC
2 SPT
3 MC
4 SPT
5 MC
6 SPT
7 -32.0
-35.0
-40.0
-50.0
-60.0
50 70
40 100
100
100
100
4-4-4
(8)
4-8-12
(20)
1-1-1
(2)
11-25-29
(54)
10-11-17
(28)
11-17-23
(40)
5-6-9
(15)
MC = 23%
Fines = 90%
MC = 25%
DD = 97 pcf
Fines = 72%
MC = 26%
Fines = 96%
MC = 18%
DD = 113 pcf
MC = 24%
DD = 100 pcf
Fines = 95%

2.0 5.0

10.0 20.0

30.0 Silty CLAY (CL) - brown, wet, medium stiff, low
plasticity, trace sand, trace gravel.

Sandy CLAY (CL) - brown, wet, soft, low plasticity,
oxidation mottled, very fine-grained sand.

Silty CLAY (CL) - brown mottled, wet, very stiff, low
plasticity.

Silty CLAY (CL-CH) - brown, wet, soft, medium to
high plasticity, oxidation mottled, trace very fine to
medium-grained sand.

Silty CLAY (CL-CH) - brown mottled, wet, hard, low
to high plasticity, waxy, oxidation mottled, trace
very fine to medium-grained sand.

Fat CLAY (CH) - brown, wet, very stiff, high
plasticity, oxidation mottled.

Fat CLAY (CH) - brown, wet, hard, high plasticity,
oxidation mottled.

Silty CLAY (CL-CH) - brown, wet, stiff, low to
medium plasticity, oxidation mottled.

Cap
Medium
Chips
Bentonite
Seal
2" Blank
Section
NOTES 32.76730, -115.54324
GROUND ELEVATION -30 ft

LOGGED BY CCC
DRILLING METHOD Hollow Stem Auger
DRILLING CONTRACTOR Pacific Drilling GROUND WATER LEVELS:

CHECKED BY AA
DATE STARTED 8/24/22 COMPLETED 8/24/22
AT TIME OF DRILLING 12.00 ft / Elev -42.00 ft

AT END OF DRILLING --- AFTER DRILLING ---
HOLE SIZE 8 inches SAMPLE TYPE NUMBER DEPTH (ft)
0 5
10 15
20 25
30 35
(Continued Next Page)
PAGE 1 OF 2
WELL NUMBER MW-2
CLIENT City of El Centro
PROJECT NUMBER 020-0401.00001
PROJECT NAME Southern Pump Station
PROJECT LOCATION El Centro, CA GENERAL BH / TP / WELL - GINT STD US LAB.GDT - 10/19/22 17:51 - C:\USERS\CCHASE\DESKTOP\020-0401.00001 SERVER\020-0401.00001 CITY OF EL CENTRO SOUTHERN PUMP STATION.GPJ Nicklaus Engineering
1851 W. 24th Street
Yuma, Arizona 85364
Telephone 928-344-8374
Fax 928-726-6994 RECOVERY % BLOW COUNTS (N VALUE) TESTS AND

REMARKS GRAPHIC LOG

MATERIAL DESCRIPTION
Casing Top Elev: -30 (ft)
Casing Type: PVC

WELL DIAGRAM

8.a
Packet Pg. 1130 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) MC
8 SPT
9 MC
10 SPT
11 -70.0
-75.0
-80.0
-81.5
100
100
100
100
12-14-28
(42)
12-14-28
(42)
12-14-28
(42)
9-11-12
(23)
MC = 34%
DD = 87 pcf
MC = 27%
DD = 97 pcf
Groundwater
encountered at 12
ft. Total Depth =

51.5 ft.

40.0 45.0

50.0 51.5
Silty CLAY (CL-CH) - brown, wet, very stiff, low to
medium plasticity, oxidation mottled, minor caliche.

Silty CLAY (CL) - brown, wet, hard, low to medium
plasticity, oxidation mottled.

Silty CLAY (CL-CH) - brown, wet, very stiff, low to
high plasticity, oxidation mottled.

Silty CLAY (CL) - brown, wet, very stiff, low to
medium plasticity, oxidation mottled.

Bottom of borehole at 51.5 feet.
#3 Sand Pack
2" 0.020"
Slotted Pipe
#3 Sand Pack SAMPLE TYPE NUMBER DEPTH (ft)
35 40
45 50
PAGE 2 OF 2
WELL NUMBER MW-2
CLIENT City of El Centro
PROJECT NUMBER 020-0401.00001
PROJECT NAME Southern Pump Station
PROJECT LOCATION El Centro, CA GENERAL BH / TP / WELL - GINT STD US LAB.GDT - 10/19/22 17:51 - C:\USERS\CCHASE\DESKTOP\020-0401.00001 SERVER\020-0401.00001 CITY OF EL CENTRO SOUTHERN PUMP STATION.GPJ Nicklaus Engineering
1851 W. 24th Street
Yuma, Arizona 85364
Telephone 928-344-8374
Fax 928-726-6994 RECOVERY % BLOW COUNTS (N VALUE) TESTS AND

REMARKS GRAPHIC LOG

MATERIAL DESCRIPTION WELL DIAGRAM

8.a
Packet Pg. 1131 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) AU
MC
1 SPT
2 MC
3 SPT
4 MC
5 SPT
6 MC
7 -35.0
-61.5
50 50
50 70
70 100
80 5-5-9
(14)
2-3-2
(5)
3-6-9
(15)
3-4-3
(7)
3-2-3
(5)
4-5-7
(12)
5-9-14
(23)
MC = 15%
DD = 101 pcf
LL = 20
PL = 13
Fines = 16%
MC = 27%
DD = 91 pcf
MC = 25%
MC = 30%
DD = 87 pcf
MC = 27%
DD = 94 pcf
Groundwater
encountered at 16
ft. Total Depth =

31.5 ft.

5.0 31.5
ARTIFICIAL FILL (Af) (0 to 5')
Sandy CLAY (CL) - light brown mottled, wet,
medium stiff to stiff, low plasticity, very fine to
medium-grained sand, minor oxidation, minor
caliche, minor rootlets.

Sandy CLAY (CL) - grayish-brown mottled, wet,
medium stiff, oxidation mottled, low plasticity, very
fine to medium-grained sand, caliche stringers.

ALLUVIUM (Qal) (5 to 31.5')
Silty CLAY (CL-CH) - grayish-brown, wet, medium
stiff, low to medium plasticity, oxidation mottled.

Silty CLAY (CL-CH) - grayish-brown, wet, very stiff,
low to medium plasticity, oxidation mottled.

Silty CLAY (CL-CH) - light brown, wet, medium stiff,
low to medium plasticity, oxidation mottled.

Silty CLAY (CL-CH) - light brown, wet to saturated,
medium stiff, low to medium plasticity, oxidation
mottled.

Silty CLAY (CL-CH) - light grayish-brown mottled,
wet to saturated, stiff, low to medium plasticity,
oxidation mottled.

Silty CLAY (CL-CH) - light grayish-brown mottled,
wet to saturated, very stiff, low to medium plasticity, oxidation mottled.

Bottom of borehole at 31.5 feet.

Cap
Medium
Chips
Bentonite
Seal
2" Blank
Section
#2/16 Sand
Pack
2" 0.010"
Slotted Pipe
#2/16 Sand
Pack
NOTES 32.76678, -115.53586
GROUND ELEVATION -30 ft

LOGGED BY CCC
DRILLING METHOD Hollow Stem Auger
DRILLING CONTRACTOR Pacific Drilling GROUND WATER LEVELS:

CHECKED BY AA
DATE STARTED 10/3/22 COMPLETED 10/3/22
AT TIME OF DRILLING 16.00 ft / Elev -46.00 ft

AT END OF DRILLING --- AFTER DRILLING ---
HOLE SIZE 8 inches SAMPLE TYPE NUMBER DEPTH (ft)
0 5
10 15
20 25
30 PAGE 1 OF 1
WELL NUMBER MW-3
CLIENT City of El Centro
PROJECT NUMBER 020-0401.00001
PROJECT NAME Southern Pump Station
PROJECT LOCATION El Centro, CA GENERAL BH / TP / WELL - GINT STD US LAB.GDT - 10/19/22 17:51 - C:\USERS\CCHASE\DESKTOP\020-0401.00001 SERVER\020-0401.00001 CITY OF EL CENTRO SOUTHERN PUMP STATION.GPJ Nicklaus Engineering
1851 W. 24th Street
Yuma, Arizona 85364
Telephone 928-344-8374
Fax 928-726-6994 RECOVERY % BLOW COUNTS (N VALUE) TESTS AND

REMARKS GRAPHIC LOG

MATERIAL DESCRIPTION
Casing Top Elev: -30 (ft)
Casing Type: PVC

WELL DIAGRAM

8.a
Packet Pg. 1132 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) AU
SPT
1 MC
2 SPT
3 MC
4 SPT
5 MC
6 SPT
7 -30.5
-38.0
-53.0
-54.0
-58.0
-59.5
40 80
40 30
100
100
100
3-3-3
(6)
5-8-13
(21)
3-4-5
(9)
3-7-6
(13)
5-8-14
(22)
5-8-13
(21)
3-2-4
(6)
MC = 21%
Fines = 12%
MC = 23%
DD = 103 pcf
MC = 24%
LL = 25
PL = 22
MC = 27%
DD = 95 pcf
MC = 29%
DD = 91 pcf
Groundwater
encountered at 11
ft. Total Depth =

31.5 ft.

2.5 10.0

25.0 26.0

30.0 31.5
ARTIFICIAL FILL (Af) (0 to 2.5')
Silty CLAY (CL) - light brown mottled, wet, medium
stiff to stiff, low to medium plasticity, oxidation
mottled, minor sand, minor caliche.

ALLUVIUM (Qal) (2.5 to 31.5')
Silty CLAY (CL-CH) - light brown, wet, medium stiff,
low to medium plasticity, oxidation mottled.

Silty CLAY (CL-CH) - light brown, wet, very stiff,
low to medium plasticity, oxidation mottled.

Sandy SILT (ML) - light brown mottled, wet, stiff,
very fine to medium-grained sand, trace
coarse-grained sand, trace clay.

Sandy SILT (ML) - light brown mottled, wet, stiff,
very fine to medium-grained sand, trace
coarse-grained sand, trace clay.

Sandy SILT (ML) - light brown, wet to saturated,
very stiff, very fine-grained sand, nonplastic.

Silty CLAY (CL-CH) - light brown mottled, wet to
saturated, very stiff, oxidation mottled, medium to
high plasticity.

SILT (ML) - light brown mottled, wet to saturated,
very stiff, oxidation mottled, nonplastic.

Sandy SILT (ML) - yellowish-brown, wet to
saturated, medium stiff, very fine-grained sand,
nonplastic.

Bottom of borehole at 31.5 feet.

Cap
Medium
Chips
Bentonite
Seal
2" Blank
Section
#2/16 Sand
Pack
2" 0.010"
Slotted Pipe
#2/16 Sand
Pack
Slough
Backfill/Borehole
Caving
NOTES 32.76389, -115.55056
GROUND ELEVATION -28 ft

LOGGED BY CCC
DRILLING METHOD Hollow Stem Auger
DRILLING CONTRACTOR Pacific Drilling GROUND WATER LEVELS:

CHECKED BY AA
DATE STARTED 10/4/22 COMPLETED 10/4/22
AT TIME OF DRILLING 11.00 ft / Elev -39.00 ft

AT END OF DRILLING --- AFTER DRILLING ---
HOLE SIZE 8 inches SAMPLE TYPE NUMBER DEPTH (ft)
0 5
10 15
20 25
30 PAGE 1 OF 1
WELL NUMBER MW-4
CLIENT City of El Centro
PROJECT NUMBER 020-0401.00001
PROJECT NAME Southern Pump Station
PROJECT LOCATION El Centro, CA GENERAL BH / TP / WELL - GINT STD US LAB.GDT - 10/19/22 17:51 - C:\USERS\CCHASE\DESKTOP\020-0401.00001 SERVER\020-0401.00001 CITY OF EL CENTRO SOUTHERN PUMP STATION.GPJ Nicklaus Engineering
1851 W. 24th Street
Yuma, Arizona 85364
Telephone 928-344-8374
Fax 928-726-6994 RECOVERY % BLOW COUNTS (N VALUE) TESTS AND

REMARKS GRAPHIC LOG

MATERIAL DESCRIPTION
Casing Top Elev: -28 (ft)
Casing Type: PVC

WELL DIAGRAM

8.a
Packet Pg. 1133 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
C-1
Appendix C
Geotechnical Laboratory Tests
Relatively undisturbed soil samples were recovered at 5-foot intervals and sample were tested in the NEI geotechnical laboratory for moisture content, dry density, sieve analyses, and Atterberg limits. Several shallow soil samples were collected along the Danenberg Road at the proposed road grade. R-value tests were performed for evaluation of the design pavement section.

Test results are shown on the corresponding sample location on the logs of the borings in Appendix B. Laboratory test results are provided in this Appendix.

8.a
Packet Pg. 1134 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 0 5
10 15
20 25
30 35
40 45
50 55
60 65
70 75
80 85
90 95
100
100 10 1 0.1 0.01 0.001
PI Cc
22 8
54 10
LL PL Cu
32 2

GRAIN SIZE DISTRIBUTION

COBBLES GRAVEL

98.3 90.2

96.3 90.0

72.4 0.6

2.36 1.18

7.36 1.18
SAND

GRAIN SIZE IN MILLIMETERS
coarse fine
Brown mottled Fat CLAY (CH)
Brown mottled Fat CLAY (CH)
Light brown mottled SILT (ML)
Brown sandy CLAY (CL)
Brown mottled silty CLAY (CL)
Classification
D100 D60 D30 D10 %Gravel
MW-1
MW-1
MW-1
MW-2
MW-2
coarse SILT OR CLAY
medium fine

2.0 5.0

15.0 2.0

5.0 %Sand %Silt %Clay

0.0 0.0

0.0 0.6

0.0 1.7

9.8 3.7

9.4 27.6

BOREHOLE DEPTH

BOREHOLE DEPTH
3 100

MW-1
MW-1
MW-1
MW-2
MW-2
24 16 30

1 1/2 6 10 50 200
U.S. SIEVE OPENING IN INCHES U.S. SIEVE NUMBERS HYDROMETER 6 3 1.5 3/4 3/8 4 8 14 20 40 60 140

2.0 5.0

15.0 2.0

5.0 PERCENT FINER BY WEIGHT
CLIENT City of El Centro
PROJECT NUMBER 020-0401.00001
PROJECT NAME Southern Pump Station
PROJECT LOCATION El Centro, CA GRAIN SIZE - GINT STD US LAB.GDT - 10/19/22 17:30 - C:\USERS\CCHASE\DESKTOP\020-0401.00001 CITY OF EL CENTRO SOUTHERN PUMP STATION.GPJ Nicklaus Engineering
1851 W. 24th Street
Yuma, Arizona 85364
Telephone 928-344-8374
Fax 928-726-6994

8.a
Packet Pg. 1135 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 0 5
10 15
20 25
30 35
40 45
50 55
60 65
70 75
80 85
90 95
100
100 10 1 0.1 0.01 0.001
PI Cc
1320
LL PL Cu

3.810.78
7 GRAIN SIZE DISTRIBUTION

COBBLES GRAVEL

96.4 95.3

16.2 12.0

1.18 1.18

2.36 2.36
SAND

GRAIN SIZE IN MILLIMETERS
coarse fine
Brown silty CLAY (CL-CH)
Brown fat CLAY (CH)
Grayish-brown mottled sandy CLAY (CL)
Light brown silty CLAY (CL-CH)
Classification
D100 D60 D30 D10 %Gravel

0.116

0.271
MW-2
MW-2
MW-3
MW-4
coarse SILT OR CLAY
medium fine

10.0 25.0

2.5 2.5
%Sand %Silt %Clay

0.086

0.122

0.0 0.0

0.0 0.0

3.6 4.7

83.8 88.0

BOREHOLE DEPTH

BOREHOLE DEPTH
3 100

MW-2
MW-2
MW-3
MW-4
24 16 30

1 1/2 6 10 50 200
U.S. SIEVE OPENING IN INCHES U.S. SIEVE NUMBERS HYDROMETER 6 3 1.5 3/4 3/8 4 8 14 20 40 60 140

10.0 25.0

2.5 2.5 PERCENT FINER BY WEIGHT
CLIENT City of El Centro
PROJECT NUMBER 020-0401.00001
PROJECT NAME Southern Pump Station
PROJECT LOCATION El Centro, CA GRAIN SIZE - GINT STD US LAB.GDT - 10/19/22 17:30 - C:\USERS\CCHASE\DESKTOP\020-0401.00001 CITY OF EL CENTRO SOUTHERN PUMP STATION.GPJ Nicklaus Engineering
1851 W. 24th Street
Yuma, Arizona 85364
Telephone 928-344-8374
Fax 928-726-6994

8.a
Packet Pg. 1136 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 0 10
20 30
40 50
60 0 20 40 60 80 100
MW-1
MW-1
MW-3
MW-4
ML
CL
MH
CH
98 96
16 CL-ML
P
L
A
S
T
I
C
I
T
Y
I
N
D
E
X

LIQUID LIMIT
Fines Classification
54 10
20 25
22 8
13 22
Brown mottled Fat CLAY (CH)
Light brown mottled SILT (ML)
Grayish-brown mottled sandy CLAY (CL)
Light brown mottled sandy SILT (ML)

LL PL PI
32 2
7 3

ATTERBERG LIMITS' RESULTS

2.0 15.0

2.5 10.0

BOREHOLE DEPTH
CLIENT City of El Centro
PROJECT NUMBER 020-0401.00001
PROJECT NAME Southern Pump Station
PROJECT LOCATION El Centro, CA ATTERBERG LIMITS - GINT STD US LAB.GDT - 10/19/22 17:29 - C:\USERS\CCHASE\DESKTOP\020-0401.00001 CITY OF EL CENTRO SOUTHERN PUMP STATION.GPJ Nicklaus Engineering
1851 W. 24th Street
Yuma, Arizona 85364
Telephone 928-344-8374
Fax 928-726-6994

8.a
Packet Pg. 1137 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Project Name: El Centro Pump Station Tested By:

Project Number: 60687863 Computed By:

Sample No.: West #1 Checked By:

Sample Type: Bulk Depth (ft.): -
Location: N/A
Soil Description: Lean Clay
Mold Number D E F
Water Added, g 120 142 161
Compact Moisture(%) 17.2 19.2 21.1
Compaction Gage Pressure, psi 250 150 50
Exudation Pressure, psi 706 532 239
Sample Height, Inches 2.6 2.6 2.6
Gross Weight Mold, g 3054 3036 2945
Tare Weight Mold, g 1964 1954 1868
Net Sample Weight, g 1090 1082 1076
Expansion, inchesx10-4 91 25 33
Stability 2,000 (160 psi) 39/101 52/122 56/128
Turns Displacement 4.14 4.61 4.71
R-Value Uncorrected 26 14 12
R-Value Corrected 28 15 13
Dry Density, pcf 108.3 105.8 103.6
Traffic Index 8.0 8.0 8.0
G.E. by Stability 1.38 1.63 1.67
G.E. by Expansion 0.30 0.08 0.11
Gf = 1.34, and 1.9 %
Retained on the ¾"
*Not Applicable
Remarks
By Exudation:

By Expansion:

At Equilibrium:
10/31/22

R-VALUE
AP

R-VALUE TEST DATA
ASTM D2844
10/29/22
Date:

Date:

Date:
10/28/22
KM
(by Exudation)
ST
13 13
*N/A
0 10
20 30
40 50
60 70
80 90
100
100200300400500600700800 0

R-VALUE

EXUDATION PRESSURE - PSI

0.00 1.00

2.00 3.00

4.00 0.00 1.00 2.00 3.00 4.00
COVER THICKNESS BY STABILOMETER (FT.)
COVER THICKNESS BY EXPANSION (FT.)

8.a
Packet Pg. 1138 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Project Name: El Centro Pump Station Tested By:

Project Number: 60687863 Computed By:

Sample No.: East #2 Checked By:

Sample Type: Bulk Depth (ft.): -
Location: N/A
Soil Description: Lean Clay
Mold Number G I H
Water Added, g 100 141 156
Compact Moisture(%) 15.2 19.1 20.6
Compaction Gage Pressure, psi 250 150 50
Exudation Pressure, psi 644 392 222
Sample Height, Inches 2.5 2.6 2.7
Gross Weight Mold, g 2924 2898 2930
Tare Weight Mold, g 1827 1818 1836
Net Sample Weight, g 1098 1079 1094
Expansion, inchesx10-4 162 39 27
Stability 2,000 (160 psi) 32/90 55/128 62/138
Turns Displacement 3.31 4.27 5.17
R-Value Uncorrected 37 13 7
R-Value Corrected 37 14 8
Dry Density, pcf 115.5 105.6 101.8
Traffic Index 8.0 8.0 8.0
G.E. by Stability 1.20 1.65 1.76
G.E. by Expansion 0.54 0.13 0.09
Gf = 1.34, and 0.0 %
Retained on the ¾"
*Not Applicable
Remarks
By Exudation:

By Expansion:

At Equilibrium:
10/31/22

R-VALUE
AP

R-VALUE TEST DATA
ASTM D2844
10/29/22
Date:

Date:

Date:
10/28/22
KM
(by Exudation)
ST
10 10
*N/A
0 10
20 30
40 50
60 70
80 90
100
100200300400500600700800 0

R-VALUE

EXUDATION PRESSURE - PSI

0.00 1.00

2.00 3.00

4.00 0.00 1.00 2.00 3.00 4.00
COVER THICKNESS BY STABILOMETER (FT.)
COVER THICKNESS BY EXPANSION (FT.)

8.a
Packet Pg. 1139 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
D-2

8.a
Packet Pg. 1140 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Dewatering Evaluation and other Geotechnical Engineering Support – Southern Pump Station AECOM
D-1
Appendix D
Analytical Laboratory Tests
Groundwater samples were collected from the monitoring wells then transferred from the site to the analytical laboratory in iced containers under chain of custody transfer protocol. The Eurofins analytical laboratory analyzed samples for potential contamination of concern generally as outlined for water quality monitoring in the Imperial Irrigation District Drain Water Quality Plan. Analytical testing included pesticides, volatile organic compounds, semi-volatile organic compounds, Title 22 metals, polycyclic aromatic hydrocarbons, and other constituents of concern. Analytical lab reports by Eurofins are provided in this Appendix.

The City of El Centro requested water quality analyses performed per “General Waste Discharge Requirements, Low Threat Discharges to Surface Waters, within the Colorado River Basin”. Accordingly analyses were performed generally per Attachment B, Table B-1 “Screening Levels for Conventional and Non-Conventional Pollutants” and Table B-2 “Screening Levels for Priority Pollutants” of the NPDES Order.

A summary of the analyses is shown in Table B-1 and B-2 in this Appendix. Note that Tables B-1 and B-2 from the Order are duplicated as Tables B-1 and B-2. Table B-3 inputs are preliminary and are based on assumed water hardness conditions for receiving waters. Additional sampling may be required to determine the upstream receiving water for hardness (per Order Table B-3).

8.a
Packet Pg. 1141 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) MW-1 MW-2 MW-3 MW-4 MW-1 MW-2 MW-3 MW-4
Total Suspended Solids (TSS)1 mg/L 1260 16900 896 1380 95 Y Y Y Y BOD5 @ 20° C or CBOD5 @ 20°
C mg/L ND ND ND ND
55 for BOD5 or 50 for
CBOD5 N N N N
Oil and Grease1 mg/L ND ND 0.571 ND 25 N N N N
pH1
standard units 7.6 7.3 7.6 8 Range 6.0-9.0 N N N N
Total Petroleum
Hydrocarbons1,2 mg/L 0.087 ND 0.075 0.4 0.1 N N N Y
MW-1 MW-2 MW-3 MW-4
Municipal
Designated
Waters (µg/L)2
Non-Municipal
Designated Waters
(µg/L)2 MW-1 MW-2 MW-3 MW-4
1,1-Dichloroethane ND ND ND ND 5 5 1 N N N N
1,1-Dichloroethylene ND ND ND ND 0.057 3.2 0.5 N N N N
1,1,1-Trichloroethane ND ND ND ND 200 200 2 N N N N
1,1,2-Trichloroethane ND ND ND ND 0.6 42 0.5 N N N N
1,1,2,2-Tetrachloroethane ND ND ND ND 0.17 1 0.5 N N N N 1,2-Dichlorobenzene ND 0.11 ND ND 600 600 0.5 N N N N
1,2-Dichloroethane ND ND ND ND 0.38 99 0.5 N N N N
1,2-Dichloropropane ND ND ND ND 0.52 39 0.5 N N N N
1,2-Cis-Dichloroethylene ND ND ND ND 6 10 N/A N N N N
1,2-Trans-Dichloroethylene ND ND ND ND 10 10 1 N N N N
1,3-Dichlorobenzene ND ND ND ND 400 2600 2 N N N N
1,3-Dichloropropylene ND ND ND ND 0.5 0.5 0.5 N N N N
1,4-Dichlorobenzene ND ND ND ND 5 0.5 0.5 N N N N
2-Chloroethyl-vinyl-ether ND ND ND ND 13 13 1 N N N N
Acetone ND ND ND ND 700 700 N/A N N N N
Acrolein ND ND ND ND 320 780 5 N N N N
Acrylonitrile ND ND ND ND 0.059 0.66 2 N N N N
Benzene ND ND ND ND 1 1 0.5 N N N N
Bromoform ND ND ND ND 4.3 360 0.5 N N N N
Carbon Tetrachloride ND ND ND ND 0.25 0.5 0.5 N N N N
Chlorobenzene ND ND ND ND 680 21000 2 N N N N
Chlorodibromomethane ND ND ND ND 0.41 34 0.5 N N N N
Chloroethane ND ND ND ND 300 300 2 N N N N
Chloroform ND ND ND ND 100 100 2 N N N N
Dichlorobromomethane ND ND ND ND 0.56 46 0.5 N N N N
Di-isopropyl Ether ND ND ND ND 5 5 N/A N N N N
Ethanol ND ND ND ND 760000 760000 N/A N N N N
Ethylbenzene ND ND ND ND 700 700 2 N N N N
Ethylene Dibromide ND ND ND ND 0.05 0.05 N/A N N N N
Methanol ND ND ND ND 3500 740000 N/A N N N N
Methyl Bromide ND ND ND ND 10 4000 2 N N N N
Methyl Chloride ND ND ND ND 3 3 0.5 N N N N
Table B-1. Screening Levels for Conventional and Non-Conventional Pollutants

1. Not applicable to discharges from established water supply systems where parameter is not expected to exceed screening level.

2. Applies only to dewatering/discharge operations near suspected petroleum hydrocarbon contaminated sites or when diesel or gasoline powered generator is used in dewatering/discharge operations.

Above Screening Level (Y/N/UNKNOWN)
Parameter Unit Screening level
400 100 100
Sample Result
N/A N
Table B-2. Screening Levels for Priority Pollutants
Parameter
Sample Result (µg/L) Screening levels Above Screening Level (Y/N/UNKNOWN) 1

ND N N Y
Minimum
Levels
(MLs)(µg/L)
Hydrocarbons, Total Petroleum
(see Table B-1)
87 75

8.a
Packet Pg. 1142 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Methyl ethyl ketone ND ND ND ND 700 700 N/A
NNNN
Methyl tertiary-butyl ether ND ND ND ND 13 13 N/A
NNNN
Methylene Chloride ND ND ND ND 4.7 1600 0.5
NNNN
Tertiary-amyl-methyl ether ND ND ND ND
55 N/A
NNNN
Tertiary Butyl Alcohol ND ND ND ND 12 12 N/A
NNNN
Tetrachloroethylene ND ND ND ND 0.8 8.85 0.5
NNNN
Toluene ND ND ND ND 150 150
2 NNNN
Trichloroethylene ND ND ND ND 2.7
5 0.5
NNNN
Trichlorofluoroethane ND ND ND ND 1200 4000 N/A
NNNN
Vinyl Chloride ND ND ND ND 0.5 0.5 0.5
NNNN
Xylenes ND ND ND ND 20 1750 N/A
NNNN
1,2-Diphenylhydrazine ND ND ND ND 0.04 0.541
NNNN
1,2,4-Trichlorobenzene ND ND ND ND 70 --5
NNNN
2-Chlorophenol ND ND ND ND 120 4005
NNNN
2,4-Dichlorophenol ND ND ND ND 93 7905
NNNN
2,4-Dimethylphenol ND ND ND ND 540 23002
NNNN
2,4-Dinitrophenol ND ND ND ND 70 140005
NNNN
2,4-Dinitrotoluene ND ND ND ND 0.11 9.15
NNNN
2,4,6-Trichlorophenol ND ND 0.14 ND 2.1 6.5 10
NNNN
2,6-Dinitrotoluene ND ND ND ND 53 535
NNNN
2-Nitrophenol ND ND ND ND 103 103 10
NNNN
2-Chloronaphthalene ND ND ND ND 1700 4300 10
NNNN
3,3’-Dichlorobenzene ND ND ND ND 0.04 0.0775
NNNN
3-Methyl-4-Chlorophenol ND ND ND ND 13 131
NNNN
2-Methyl-4,6-Dinitrophenol ND ND ND ND 13 7655
NNNN
4-Nitrophenol ND ND ND ND 53 535
NNNN
4-Bromophenyl phenyl ND ND ND ND
5 3
NNNN
ether ND ND ND ND
NNNN
4-Chlorophenyl phenyl ether ND ND ND ND
5 3 53
5 NNNN
Acenaphthene ND ND ND ND 1200 27001
NNNN
Acenaphthylene ND ND ND ND 103 103 10
NNNN
Anthracene ND ND ND ND 9600 1100005
NNNN
Benzidine ND ND ND ND 0.00012 0.000545
NNNN
Benzo(a)Anthracene ND ND ND ND 0.0044 0.0495
NNNN
Benzo(a)Pyrene ND ND ND ND 0.0044 0.0492
NNNN
Benzo(b)Fluoranthene ND ND ND ND 0.0044 0.049 10
NNNN
Benzo(g,h,i)Perylene ND ND ND ND 53 535
NNNN
Benzo(k)Fluoranthene ND ND ND ND 0.0044 0.0492
NNNN
Bis(2-Chloroethoxyl)Methane ND ND ND ND
5 3 53
5 NNNN
Bis(2-Chloroethyl)Ether ND ND ND ND 0.031 1.41
NNNN
Bis(2-Chloroisopropyl)Ether ND ND ND ND 1400 170000 10
NNNN
Bis(2-Ethylhexyl)Phthalate ND 9.7 ND ND 1.8 5.95
NYNN
Butylbenzyl Phthalate ND ND ND ND 3000 5200 10
NNNN
Chrysene ND ND ND ND 0.0044 0.0495
NNNN
Dibenzo(a,h)Anthracene ND ND ND ND 0.0044 0.0491
NNNN
Diethyl Phthalate ND ND 0.18 0.47 23000 120000 10
NNNN
Dimethyl Phthalate ND ND ND 0.1 313000 2900000 10
NNNN
di-n-Butyl Phthalate ND ND ND ND 2700 12000 10
NNNN
di-n-Octyl Phthalate ND ND ND ND 103 103 10
NNNN
Fluoranthene ND ND ND ND 300 370 10
NNNN
Fluorene ND ND ND ND 1300 14000 10
NNNN
Hexachlorobenzene ND ND ND ND 0.00075 0.000771
NNNN
Hexachlorobutadiene ND ND ND ND 0.44 501
NNNN
Hexachlorocyclopentadiene ND ND ND ND 50 170005
NNNN
Hexachloroethane ND 0.13 ND ND 1.9 8.91
NNNN
Semi-Volatile Organics
535

8.a
Packet Pg. 1143 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Indeno(12,3-cd)Pyrene ND ND ND ND 0.0044 0.049 0.05
NNNN
Isophorone ND ND ND ND 8.4 6001
NNNN
N-Nitrosodimethyl amine ND ND ND ND 0.00069 8.15
NNNN
N-Nitroso-di-n-propyl amine ND ND ND ND 0.005 1.45
NNNN
N-Nitrosodiphenyl amine ND ND ND ND5 161
NNNN
Naphthalene ND ND ND ND 103 103 10
NNNN
Nitrobenzene ND ND ND ND 17 1900 10
NNNN
Pentachlorophenol ND ND ND ND 0.28 7.91
NNNN
Phenanthrene ND ND ND ND 53 535
NNNN
Phenol ND ND ND ND 21000 4600000 50
NNNN
Pyrene ND ND ND ND 960 11000 10
NNNN
Antimony, Total
Recoverable ND 6.46 ND ND 14 4300
5 NNNN
Arsenic, Total Recoverable 12.2 58.6 8.56 6.66 50 36 10 NYNN
Beryllium, Total Recoverable ND 16.7 ND ND4 -- 0.5
NYNN
Cadmium, Total 2.07 11 1.1 ND Unknown
Y Unknown Unknown
Chromium (III) 7.27 64.4 6.52 6.77
N UnknownNN
Chromium (VI) ND ND 0.07 0.23 11 505
NNNN
Copper, Total Recoverable 20.8 149 14.5 11.5 Unknown
Y Unknown Unknown
Cyanide, Free ND ND ND ND 5.2 --
NNNN
Lead, Total Recoverable 23.5 141 11.8 8.45
YY Unknown Unknown
Mercury, Total Recoverable 0.18 0.167 0.192 0.161 0.050 0.051 0.2 YYYY
Nickel, Total Recoverable 17.9 141 10.1 10.6 Unknown Unknown NN
Selenium, Total Recoverable 23.9 161 34 13.3
5 712
YYYY
Silver, Total Recoverable ND 11.6 ND ND Unknown Unknown Unknown Unknown Thallium, Total ND 7.82 ND ND 1.7 6.31
NYNN
Zinc, Total Recoverable 46.3 414 27.6 39.1 Unknown
YN Unknown
Asbestos ND ND 50 ND 7 MFL
4 7 MFL5
--
NNYN
2,3,7,8-TCDD ND ND ND ND 1.3 x 10-8 1.4 x 10-8 --
NNNN
4,4’-DDD ND ND ND ND 0.00083 0.00084 0.05
NNNN
4,4’-DDE ND ND ND ND 0.00059 0.00059 0.05
NNNN
4,4’-DDT ND ND 0.0032 ND 0.00059 0.00059 0.01
NNNN
alpha-Endosulfan ND 0.33 0.0018 0.058 0.056 0.0087 0.02 NYNY
alpha-BHC ND ND ND ND 0.0039 0.013 0.01
NNNN
Aldrin ND ND ND ND 0.00013 0.00014 0.005
NNNN
beta-Endosulfan ND ND ND ND 0.056 0.0087 0.01
NNNN
beta-BHC ND ND ND ND 0.014 0.046 0.005
NNNN
Chlordane ND ND ND ND 0.00057 0.00059 0.1
NNNN
delta-BHC ND ND ND ND -- -- 0.005
NNNN
Dieldrin 0.0015 ND ND ND 0.00014 0.00014 0.01
YNNN
Endosulfan Sulfate 0.19 ND ND ND 110 240 0.05
NNNN
Endrin ND ND ND ND 0.036 0.0023 0.01
NNNN
Endrin Aldehyde ND ND ND ND 0.76 0.81 0.01
NNNN
Heptachlor ND ND ND ND 0.00021 0.00021 0.01
NNNN
Heptachlor Epoxide ND ND ND ND 0.0001 0.00011 0.01
NNNN
gamma-BHC ND ND ND ND 0.019 0.063 0.02
NNNN
PCBs, sum of
6 ND ND ND ND 0.00017 0.00017 0.5
NNNN
Toxaphene ND ND ND ND 0.00073 0.00075 0.5
NNNN
Refer to Table B-3
Pesticides and PCBs
Refer to Table B-3
Refer to Table B-3
Refer to Table B-3
Refer to Table B-3
Refer to Table B-3
Refer to Table B-3
Metals and Other Compounds

8.a
Packet Pg. 1144 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern

ANALYTICAL REPORT

PREPARED FOR
Attn: David Schug
AECOM Technical Services Inc.
401 West A Street, Suite 1200
San Diego California 92101
Generated 11/18/2022 9:33:52 PM Revision 1

JOB DESCRIPTION
South Pump Station El Centro / 60687863

JOB NUMBER
570-111327-1
Tustin CA 92780
2841 Dow Avenue, Suite 100
Eurofins Calscience
123456789
10 11
12 13
14 15
16 17
18 8.a
Packet Pg. 1145 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Table of Contents
Client: AECOM Technical Services Inc.

Project/Site: South Pump Station El Centro / 60687863
Laboratory Job ID: 570-111327-1

Eurofins Calscience
11/18/2022 (Rev. 1)
Cover Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Definitions/Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Case Narrative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Detection Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Client Sample Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Surrogate Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Isotope Dilution Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 QC Sample Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 QC Association Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Lab Chronicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Certification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Method Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Sample Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Subcontract Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Chain of Custody . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Receipt Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1146 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  


 
 

 
  
 
 
 
 
 

   
 
 

 
 
  
 
   
 
 
 
 
   
 
   
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1147 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

  

   
 
 


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1148 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
    

 






 

   
  
    
  
             
  
     
 
            
 

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1149 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
    
 
  
 
   
 
   
  
 
    

    
    
     
 
 
 
  

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1150 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
   


 
 

      
   
               
       
            

  
    

  
    

   
    

  
    

  
    

  
    

  
    

  
                              
         


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1151 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
     
  

 
     
        
                           
      
      
                                         
      
      
             
      
             
             
             
      
      
             
      
      
      
      
      
      
      
             
             
      
                    
                           
      
      


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1152 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
      
  

 
     
        
             
      
      
      
      
             
             
      
      
      
      
      
      
                    
      
      
      
                                         
      
      
             
      
      


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1153 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
     
  

 
       
        
                
                                                                                                                                                                                                                                                                                                                                                                                  

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1154 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
      
  

 
      
        
                                                                                                                                                                                                                                            
          

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1155 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
   
  

 
      
        
                                                                                                                                                                                  

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1156 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
     
  

 
       
        
                                                                       

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1157 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
 
 
  

 
       
        
                          
                                                                                                                     
                            

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1158 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
  

 
     
        
      
       

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1159 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
  

 
     
        


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1160 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
  

 
      
        
       
                      

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1161 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
   
  

 
               
                                                                                            

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1162 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
 
 
  

 
                


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1163 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
 
 
  

 
      
        
         
              
                       
       


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1164 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)  
  
 
 
           
    
 

     
           





      
               
      
 

                       








 
     
 
  
 

   
   
   
   





1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1165 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)  
  

 
     
 
  
 

   
   
   




 
    
 
 
 

  
  
  


  
    

 
 

  
  
  


  
    

 
 

  




1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1166 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)  
  
  
    

 
 

  




1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1167 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
   
    

 
 

  


   
    

 
 

  




1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1168 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

   

 
        
                                   
      
      
                                         
      
      
             
      
             
             
             
      
      
             
      
      
      
      
      
      
      
             
             
      
                    
                           
      


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1169 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    

 
      
 
                            
      
      
      
      
             
             
      
      
      
      
      
      
                    
      
      
      
                                         
      
      
 
             
      
      
   

       

 
    




       
       
       
       


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1170 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    

       

 
    




       
       
       
       
       
               
       
       
       
       
       
       
               
       
       
       
       
               
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
               
       
       
       
       


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1171 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    

       

 
    




       
       
               
       
       
       
       
       
       
               
       
       
       
       
       
       
       
       
       
       
       
   


 
  
    
    
    
   

          
 
    



  

                                       
         
         
                                                  

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1172 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    

         

 
    



  

         
         
                   
         
         
                   
                   
         
         
                   
         
         
         
         
         
         
         
         
         
         
         
         
                             
         
                             
         
         
                             
         
         
         
         
                   
                   
         
         


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1173 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    

         

 
    



  

         
         
         
                             
         
         
         
                                                           
         
   


 
  
    
    
    
    
 
 
         
                        
                                                                                                                

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1174 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
 
 
         
                                                                                                                                                                                                                                                                                                                                                                                                        

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1175 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
 
 
         
                                                              
 


     
                               
            
 
        

 
    




       


      
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
               
       
       


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1176 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
 
        
 
    




       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
               
       
               
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1177 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
 
   


 
  
    
    
    
    
     
   
 
           
 
    



  

         


        
         
         
         
                             
         
         
         
         
         
                    
         
         
         
         
         
         
         
                                       
                   
         
         
         
         
         
         
         


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1178 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
 
         

 
    



  

         
         
         
         
         
         
                                                           
                   
         
         
         
         
         
         
                   
                    
                   
         
         
                                       
         
         
         
         
   


 
  
    
    
    
    
     


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1179 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

   
 
 
         
                                                                                                                                                     
 


     
          
 
       

 
    




       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
   


 
  
    


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1180 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

   
 
         

 
    



  

         
         
         
                   
         
         
         
                             
         
                   
             


 
  
    

   
 
 
         
                                                              
 


     
           
 
       

 
    




       


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1181 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
 
   


 
  
    
   
 
          

 
    



  

         
   


 
  
    

   
 
 
       
 
               
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
               
 

 
     


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1182 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
 


      

 
    




   


 
  
   
 


        

 
    



  

   


 
  
    

 
      
 
              
 
          

       

 
    




   


 
  
   

         

 
    



  

   


 
  


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1183 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    

 
        
           

       

 
    




   

         

 
    



  

 
 

        

 
    








 
 

           
 
    







  

    
 
 
         
              
 


     
      
 


     


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1184 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
 
       

 
    




   


 
  
   


 
  
   
 
         

 
    



  

   


 
  
   


 
  

   
 
 
         
                                                                                                   
 
       

 
    




       


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1185 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

   
 
       

 
    




       
       
       
       
       
       
       
       
       
   
 
         

 
    



  

         
         
         
         
         
         
         
         
         
         
         

   
 
 
         
           
 
       

 
    






1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1186 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

   
 
         

 
    



  


   
 
 
         
           
 
       

 
    




   
 
         

 
    



  


   

 
      
 
           

       

 
    




   

         

 
    



  



1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1187 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

   

 
        
           

       

 
    




   

          
 
    



  


 
 

      

 
   



  

      

   

 
        
           

        

 
    




   

 


     
 
        

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1188 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

   



      


 
    




 
 



    

 
   



  



1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1189 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  


          
    
          

          
    
          
                        
           


          
    
                    
           
                  
           
     
                  

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1190 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  


          
    
          
                        
          
    
          
           


          
    
              
    


          
    
          
           
                  

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1191 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  


          
               
           
                  
          
    
          
           
                  

          
    
          
           
                  
          
    
     
          


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1192 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  


          
         

          
    
          
          
    

          

          
    
          

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1193 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
    
 
 

       




   



 
 
 

  
  
                       
                       
                       
                       
                       
             
             
                    
                     
                    
                     
           
         
            
          
          
          
 

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1194 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
    

            

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1195 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
    

    
   
 
   
    
  
     
   

    
   
 

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1196 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
   
                   
               
   
   
       
   
   
   
           
       
           


 



  
    

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1197 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)  
    
           
 

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1198 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)  
      
     
  

    
 
 
 
   
  
 
 
 
  
    
  
                            



 
  



 




 







 

     
        
 
   


              
    
          
    
   
     
                                                                                                                                                                                                                                                     
    

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1199 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) OrderID: 322219630

123456789
10 11
12 13
14 15
16 17
18 8.a
Packet Pg. 1200 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

123456789
10 11
12 13
14 15
16 17
18 8.a
Packet Pg. 1201 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

123456789
10 11
12 13
14 15
16 17
18 8.a
Packet Pg. 1202 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

123456789
10 11
12 13
14 15
16 17
18 8.a
Packet Pg. 1203 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

123456789
10 11
12 13
14 15
16 17
18 8.a
Packet Pg. 1204 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
   
  



  
        
 
 
 
  
  
  
   
         
 
    
 
 
 
  
  
 
 
   


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1205 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
   
  

     
  
  
 
    
      
  
  
  
     
 
 
 
 
        
  


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1206 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
   
  


 
  
    
  
 
 
  
  
  
  
           
 
 
 
 
 
 
  
  
 
 
   


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1207 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Eurofins Calscience
Eurofins Calscience is a laboratory within Eurofins Environment Testing Southwest, LLC, a company within Eurofins Environment Testing Group of Companies Job Notes
This report is issued solely for the use of the person or company to whom it is addressed. Any use, copying or disclosure other than by the intended recipient is unauthorized. If you have received this report in error, please notify the sender and destroy this report immediately. This report shall not be reproduced except in full, without prior express written approval by the laboratory.

The data in the report relate to the field sample(s) as received by the laboratory and associated QC. All results have been reviewed and have been found to be compliant with laboratory and accreditation requirements, with the exception of the noted deviation(s). For questions, please contact the Project Manager.

The test results in this report relate only to the samples as received by the laboratory and will meet all requirements of the methodology, with any exceptions noted. This report shall not be reproduced except in full, without the express written approval of the laboratory. All questions should be directed to the Eurofins Calscience Project Manager.

Authorization
Generated
11/18/2022 9:33:52 PM
Revision 1
Authorized for release by
Vikas Patel, Project Manager I
[email protected]
(714)895-5494
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18

8.a
Packet Pg. 1208 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)

ANALYTICAL REPORT
Eurofins Calscience
2841 Dow Avenue, Suite 100
Tustin, CA 92780
Tel: (714)895-5494
Laboratory Job ID: 570-108017-1
Client Project/Site: South Pump Station El Centro / 60687863 For:

AECOM Technical Services Inc.
401 West A Street, Suite 1200
San Diego, California 92101
Attn: David Schug
Authorized for release by:
9/20/2022 1:09:39 PM
Vikas Patel, Project Manager I
(714)895-5494
[email protected]
The test results in this report meet all 2003 NELAC, 2009 TNI, and 2016 TNI requirements for accredited parameters, exceptions are noted in this report. This report may not be reproduced except in full, and with written approval from the laboratory. For questions please contact the Project Manager at the e-mail address or telephone number listed on this page.

This report has been electronically signed and authorized by the signatory. Electronic signature is intended to be the legally binding equivalent of a traditionally handwritten signature.

Results relate only to the items tested and the sample(s) as received by the laboratory. 1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1209 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) Table of Contents
Client: AECOM Technical Services Inc.

Project/Site: South Pump Station El Centro / 60687863
Laboratory Job ID: 570-108017-1

Eurofins Calscience
9/20/2022
Cover Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Definitions/Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Case Narrative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Detection Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Client Sample Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Surrogate Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Isotope Dilution Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 QC Sample Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 QC Association Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Lab Chronicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Certification Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Method Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Sample Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Subcontract Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Chain of Custody . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Receipt Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1210 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  


 
 

 
 

 
  
 

 
  

 
 

 
  

   
 
 
 
 
   
 
   
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
   


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1211 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

  

 


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1212 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
    

 






    
  
  
   
      
   
     
 
  
 
  
    

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1213 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
    
 
  
 
 
    
    

     
 
 
 
 
   

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1214 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
   


 
 

      
   
                          

  
    

  
    

  
    

  
    

  
    

  
    

  
    

  
    

  
    

  
    

  
    

  
                              
         


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1215 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
  
 
  

 
                                          
      
      
                                         
      
      
             
      
             
             
             
      
      
             
      
      
      
      
      
      
      
             
             
      
                    
                           
      
      


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1216 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
     
  

 
                            
      
      
      
      
             
             
      
      
      
      
      
      
                    
      
      
      
                                         
      
       
              
       
       


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1217 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
  

 
                                

                                                                                                                                                                                                                                                                                                                                                                                

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1218 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
     
  

 
                                                                                                                                                                                                                                                                 

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1219 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

 
  

 
                                                                                                                                                                      

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1220 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
  
  

 
                                           

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1221 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
  
 
  

 
                                                                                       

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1222 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
 
 
  

 
       
               
       
       
       
       
       
       
       
       
       
       
       
       
       
       
       
              

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1223 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
  

 
      
               
       

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1224 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
  

 
                

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1225 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    
  

 
                        
                       

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1226 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
 
 
  

 
                                                                                                            

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1227 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
 
 
  

 
                 

1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1228 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
 
 
  

 
                              
              
       
             



1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1229 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)  
  
 
 
           
    
 

     
           





      
               
      
 

                       








 
     
 
  
 

   
   
   
   





1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1230 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)  
  

 
     
 
  
 

   
   
   




 
    
 
 
 

  
  
  


  
    

 
 

  
  
  


  
    

 
 

  




1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1231 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project)  
  
  
    

 
 

  




1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1232 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
   
    

 
 

  


   
    

 
 

  




1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1233 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  

   

 
        
                                   
      
      
                                         
      
      
             
      
             
             
             
      
      
             
      
      
      
      
      
      
      
             
             
      
                    
                           
      


1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 8.a
Packet Pg. 1234 Attachment: Volume II - Technical Specifications (4185 : Approval of Plans and Specifications - Southern Pump Station Project) 
  
    

 
      
 
                            
      
      
      
      
             
             
      
      
      
      
      
      
                    
      
      
      
                                         
      
     
 
             
      
      
   

       

 
    




       
       
       
       
