NGSI
GSI Proposal No. 9001167 ENVIRONMENTAL
April 25, 2022
Ms. Gina Nila
Deputy Director of Public Works & Development Services
City of Commerce
2535 Commerce Way,
Commerce, California 90040
Proposal for Engineering Support Services During Well Construction of Well 7-02, Commerce, California
Dear Ms. Nila:
GSI Environmental Inc. (GSI) is pleased to provide this proposal for engineering support services during construction of the new groundwater production well designated as COM 7-02 to be located at Station 007 of the Commerce System in City of Commerce, California. We understand that this new well is an important additional component to the Commerce water production system and have assembled a highly qualified team to deliver a quality project.
The scope of work and estimated costs presented are based on our review of the request for proposal (RFP) that California Water Service Company (CWSC) issued on behalf of City of Commerce (City) on February 8, 2022. In addition to GSl's expertise and resources, we have enlisted Mr. Russell Kyle of Kyle Groundwater, Inc. (KGI), previously at Wood Rogers, as a subconsultant for providing consulting services to complement our team. A short summary of KGI's qualifications is included in Attachment A
Following sections provide the specific information that was requested in the RFP.
Background
The COM 7-02 groundwater production well site (Site) is on a City of Commerce owned property and is located adjacent to the existing well COM 7-01. Wood Rodgers letter titled "COM 7-02 Well - Updated Data Review to Address Water Quality Concerns", dated March 30, 2018, includes a summary description of the geology and aquifer system in area of COM 7-02.
The geology at COM 7-02 is described as alternating layers of silt, silty sand, clayey sand, sand, and gravelly sand to a depth of approximately 140 feet. Perched and semi-perched water may be present in these shallow alluvial deposits in some areas. Below the alluvial deposits are portions of the Gaspur aquifer, Bellflower aquitard, Gardena-Gage aquifer, and Lynwood aquifer. The aquifers typically consist of fine- to coarse-grained sand and gravel and are difficult to distinguish from each other in this area. Below Lynwood is the Silverado aquifer, which is the primary source of ground water supply in this area, followed by the Sunnyside aquifer.
Based on Wood Rodgers review of the available construction records and approximate thicknesses of the primary underlying aquifers and aquitards (DWR, 1961), the well screen section for COM 7-01 is from 340 to 540 feet depths and produces water primarily from the Silverado aquifer and the top of the Sunnyside aquifer. The proposed completion depth of the COM 7-02 Well is 570 feet, with a planned screen interval of 330 to 530 feet below ground surface which is close to the depth and screen section of the existing well COM 7-01.1 We 1 The final screened interval depth will be determined using the subsurface conditions encountered during drilling.
19200 VON KARMAN AVE., SUITE 800 | IRVINE, CA 92612 | 949.679.1070| www.gsi-net.com AUsTIN, TX • Houston. TX • OAKLAND, CA
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understand that, upon completion of construction of the well COM 7-02, both wells COM 7-01 and COM 7-02 will be utilized for groundwater production.
As stated in the State Water Resources Control Board (SWRCB) - Division of Drinking Water (DDW) letter dated April 2, 2018, the SWRCB's GeoTracker database includes 62 hazardous material incident sites located within a one-mile radius of the proposed well site for COM 7-02.
Specifically, Gehr facility (Gehr) is located about 200 feet from the proposed Well COM 7-02 and is currently under the oversight of the Los Angeles Regional Water Quality Control Board (RWQCB). Shallow groundwater under the Gehr facility has been impacted by volatile organic compounds (VOCs) albeit in low concentrations. The deepest groundwater monitoring well (MW-07) at Gehr facility is screened from 135 feet to 155 feet depths. Upon SWRB's request, the RWQCB reviewed the proposed COM 7-02 design and location and stated in an email correspondence dated June 23, 2017 that approximately 200 feet of sediments separate the bottoms of the groundwater monitoring wells at the Gehr facility from the top of the screen interval in the proposed well COM 7-02 and that the location of the proposed Well COM 7-02 would not pose a problem in terms of potential impact from VOCs originating from the Gehr facility.
Following review of the Preliminary Well Design, the SWRQB approved the proposed Well COM 7-02 location in their letter dated April 2, 2018, with the following conditions:
• If the pilot borehole tests yield acceptable results, the new well must be designed and constructed based on the test results to minimize the downward migration of contaminants.
• The annular seal for COM 7-02 must be extended to the first impervious stratum. The City must provide the Division with the borehole profile clearly showing the locations of • The City should work with Southern Pacific Railroad to ensure no chemicals such as herbicides and insecticides are used within 50 feet of COM 7-02. Likewise, the City must contact and work with the owner of the abandoned railroad. The City must provide the SWRCB with the documentation demonstrating that a 50-foot radius control zone is established for COM 7-02.
• The City must closely track the remediation status of the clean-up sites that may affect the quality of water produced by the proposed well. The City may need to conduct periodical monitoring of chemicals of concern based on information gathered from the cleanup sites' monitoring program.
To comply with the above requirements and to properly design the COM 7-02, Wood Rodgers recommended determining the exact location of the confining layers between aquifers and identify the vertical extent of the groundwater contamination.
Project, City of Commerce, California" dated August 9, 2018. The scope of the proposed work included characterization of the shallow groundwater zone(s) in the well-head area of the proposed production well COM 7-02 by installing two groundwater monitoring wells to approximate depths of 150 feet and 250 feet. The work plan was reviewed and approved by the RWQCB and the DDW. Subsequently, the City worked with the RWQCB and Gehr who agreed to install a downgradient monitoring well (MW-17) on the City property, west of the proposed 2 • GSI
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location of the COM 7-02. Reportedly, the total depth of MW-17 is 141 feet with the screened interval extending from 121 to 141 feet below grade. The results of sampling of MW-17 identified tetrachloroethene (PCE) at a concentration of 8.3 micrograms per liter (ug/l); similar to the detected concentrations of PCE in the other monitoring wells within the southern area of the Gehr facility.
Based on GSl's meeting and discussions with the RWQCB, and due to the low PCE concentration in MW-17, the RWQCB did not require Gehr to conduct additional investigation or to install a deeper monitoring well near MW-17. Nonetheless, further refining the vertical extent of PCE beyond the depth of MW-17 and taking preventive measures to avoid movement of PCE from shallow to deeper water-bearing zone(s) during drilling and installation of the production well was necessary.
To meet the objectives of the water quality assessment as presented in the December 10, 2019, letter to the DDW, GSI advanced one boring to a depth of 246 feet at the Site to evaluate lithology, identify confining (lower permeability) zones at depths greater than 110 feet, collect discrete depth groundwater samples for analysis, and perform downhole geophysical logging.
The results of the study were reported to the DDW, RWQCB, and the City on June 15, 2020.
Based on field observations of the sediment cores and drill cuttings and the results of the downhole geophysical logs, confining zones were identified at depths of approximately 137 to 144 feet and 207 to 215 feet.
As stated above, the PCE concentration reported in MW-17 (with the well screen interval from 121 to 141 feet depths) was 8.3 ug/l. Two discrete depth groundwater screening samples were borehole was advanced. VOCs including PCE, trichloroethene (TCE), and 1,4-dioxane were detected in the 170-foot discrete depth groundwater sample at maximum concentrations of 1.8 ug/l, 0.58 ug/l, and 0.22 ug/l, respectively. PCE, TCE, and 1,4-dioxane were not detected in the deeper discrete depth groundwater sample collected at a depth of 210 feet.
The reported maximum PCE and TCE concentrations of 1.8 ug/l and 0.58 ug/l, respectively, are both below their California MCL of 5 ug/l. The reported 1,4-dioxane concentration of 0.22 ug/l in the 170-foot discrete depth groundwater sample was below its respective SWRCB Notification and Response Levels, and below its respective San Francisco Bay Area RWQCB Environmental Screening Levels.
The results of the water quality assessment demonstrate that subsurface geologic material, particularly the two lower permeability zones identified at depths of 137 to 144 feet and 207 to 215 feet depths have effectively attenuated PCE with depth from a concentration of 8.3 ug/l (adjacent well MW-17 with a well screen termination depth of 141 feet) to 1.8 ug/| (discrete depth groundwater sample collected at a depth of 170 feet), to a non-detect concentration (discrete depth groundwater sample collected at a depth of 210 feet). Also, TCE and 1,4- dioxane concentrations show a declining trend with depth from 1.7 ug/l (TCE) and 0.22 ug/l (1,4-dioxane) reported in the discrete depth groundwater sample collected at a depth of 170 to non-detect concentrations at a depth of 210 feet.
GSI recommended that the results of the water quality assessment be provided to the City's design engineer and contractor for review and consideration during the design and installation of production well COM 7-02. GSI also recommended that a permanent protective casing be installed during the installation of COM 7-02 to a depth of approximately 210 feet to seal off the production well from overlying groundwater containing low-level concentrations of PCE, TCE, and 1,4-dioxane.
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Project Understanding and Approach
Based our review of the work scope stated in the RFP, the GSI team will provide engineering support services including preconstruction support, well drilling inspection and design support, reporting, and permitting.
Task 1.0 - Pre-Construction Support
Task 1.1 - Preliminary Investigation and Background Research The GSI team will acquire and review readily available hydrogeologic data, reports, and published literature within the project area and vicinity, including the location of facilities, details of well construction for nearby active, inactive, and destroyed/abandoned wells, static and pumping groundwater levels, instantaneous pumping rates, specific capacity data, historical plant efficiency tests, and existing well pump curves. As the preliminary investigation and desigr for this well has already been completed, it is our understanding that new information particularly from a new well installed by Golden State Water Company (GSWC), will be reviewed within the primary context of identifying any changes to the proposed well design. Any significant changes to the anticipated hydrogeology at the site (e.g., depth and thickness of target aquifers) will be utilized to modify the proposed well design, as necessary. It is assumed that CWSC will provide the preliminary design report for DOM 300-01 and nearby DOM 299-01 and will assist in gathering relevant information from GSWC regarding their new well. The results of this review will be provided to CWSC in the form of a brief Technical Memorandum.
Task 1.2 - Perform Hydrogeological Assessment
The GSI team will perform a brief assessment utilizing newly obtained hydrogeological information. It is assumed that this study will focus on possible changes to drilling methodology and well design, and possible hurdles related to permitting the well for operation through DDW.
Results of the assessment will be provided to CWSC in the form of a brief technical memorandum.
Task 1.3 - Perform Well Interference Study
It is generally not advisable to site a new production well within proximity to an existing production well as interference may cause additional water level drawdown resulting in increased pumping costs. The GSI team will conduct a conceptual aquifer study at the COM 7- 02 site using the Theis equation for non-steady state radial flow to pumping wells in a confined aquifer (Theis, 1935), and using published aquifer parameters and aquifer pumping test and recovery data obtained from aquifer testing. Results of the study will enable estimation of the magnitude of water level interference that may be imparted on surrounding wells from operation of the new well. Results of this study will be provided to CWSC in the form of a brief technical memorandum.
Task 1.4 - Groundwater Quality Assessment
As discussed in Task 1.1, the GSI team will review new groundwater quality information within the context of potential changes to the preliminary design for COM 7-02. Specifically, any available groundwater quality data from exploratory borings and monitoring wells at the well site and adjacent sites will be utilized. Additionally, the GSI team will revisit the SWRCB GeoTracker database and review any new information regarding the location, details, and status of sites of environmental concern. The results of this review will be provided to CWSC in the form of a brief letter report.
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Task 1.5 - Review Plans & Specifications
The GSI team will review CWSC's existing plans and specifications for this project and make recommendations regarding any edits and improvements, and any changes to the preliminary well design details based on the results of the Task 1.1 and 1.2 reviews.
Task 1.6 - Attend Pre-Construction Meeting and Site Walk The GS team's project manager and lead geologist will attend a pre-construction meeting and site walk with CWSC personnel and the selected drilling contractor to establish the final location of the well and address any technical, logistical and/or contractual concerns. Discussion will also include, but not be limited to, required submittals, permit requirements, noise mitigation and monitoring, discharge location and conveyance, discharge requirements, construction water source and conveyance, site access, work schedules, submittal of pay requests, and communication protocol. It is assumed that the meeting will take place at the well site in Commerce, California.
Task 2.0 - Well Drilling Inspection and Design Services Task 2.1 - Contractor Mobilization
A GSI team member will provide part-time inspection during mobilization of contractor equipment and will inspect said equipment prior to mobilization to verify that the equipment is suitable for the specified work.
Task 2.2 - Noise Wall Installation
A GSI team member will provide part-time inspection during installation of noise mitigation barriers, and monitoring systems to verify that the equipment is suitable for the specified work, has been installed in the correct location, and is functioning properly.
Task 2.3 - Installation of Conductor Casing and Sanitary Seal A GSI hydrogeologist will provide full-time inspection during drilling of the conductor borehole and installation of the conductor casing and sanitary cement seal to an anticipated depth of 100 feet below ground surface. The GSI hydrogeologist will inspect the conductor casing material, borehole and casing diameters, and casing wall thickness to verify conformance with the technical specifications and final design. The cement mix used for the sanitary seal will be compared to design and the time of mixing will be noted to ensure that an extended period has not taken place between mixing and delivery to the site. Cement samples will be collected during installation and submerged in drilling fluid to simulate downhole conditions. These samples will be monitored to ensure that the cement has sufficiently set, particularly when multiple cement pours are specified. Additionally, GSI will coordinate with the drilling contractor and the County inspector to ensure that the sanitary seal is in conformance with County and State regulatory requirements.
Task 2.4 - Pilot Borehole Drilling
The GSI team will provide full-time inspection during drilling of the pilot borehole to an anticipated depth of approximately 560 feet. Composite formation cuttings will be collected at 10-foot intervals or at major changes in the character of formation materials. Each sample will be classified utilizing the Unified Soil Classification System (USCS) visual method. During drilling, the GSl geologist will witness measurement of pertinent drilling fluid parameters to optimize protection of water-bearing formations and borehole integrity. Additionally, GSI will witness borehole drift surveys for confirmation of borehole verticality, to be measured every 100 5 NGSI
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feet of depth. Assuming an average drilling rate of 10 feet per hour, and a 24-hour per day work schedule, it is anticipated that borehole drilling will take approximately two (2) to three (3) days to complete.
Task 2.5 - Collection and Logging of Formation Samples
Collection and logging of formation samples is included in Task 2.4.
Task 2.6 - Borehole Geophysical Survey Logging
Upon completion of pilot borehole drilling, the GSI team will provide full-time inspection services of downhole geophysical borehole logging, including short- and long-normal resistivity, focused- resistivity, temperature, spontaneous potential, single-point resistance, gamma-ray, sonic velocity / variable density, and borehole deviation. These geophysical logs, in combination with borehole lithology, will be used to identify target aquifer intervals for isolated aquifer zone testing.
Task 2.7 - Select Isolated Aquifer Zone Test Intervals
The GSl team's lead hydrogeologist will review the pilot-borehole lithology and geophysical survey logs and will select up to four (4) 20-foot aquifer intervals for isolated aquifer zone testing. Recommended zone test intervals will be presented to CWSC in electronic letter format within 24-hours of the completion of geophysical logging. Upon approval by CWSC, the recommended zone test intervals will be provided to the drilling contractor for implementation.
Task 2.8 -Isolated Aquifer Zone Testing
A GSI team hydrogeologist will provide part-time inspection during isolated aquifer zone testing and will provide close monitoring during construction and testing of each zone. We recommend that zone testing be performed at discharge rates exceeding 200 gallons per minute (gpm), if possible, to ensure that representative sampling of the aquifer is taking place and that the aquifer is being sufficiently stressed to provide the best possible field data. It is further recommended that turbidity measurements taken from pumped groundwater be less than 10 nephelometric turbidity units (NTUs) for at least three hours prior to collecting water quality samples.
After each zone has been appropriately developed to the satisfaction of GSI lead hydrogeologist, groundwater samples will be collected and delivered to a State-certified water quality testing laboratory for analysis for of the constituents presented in the RFP. It is recommended that groundwater quality samples collected from each zone be analyzed on a 72- hour (i.e., 3-day rush) turn-around-time as the results of these analyses are integral for determining the final well design. Discharge rate, and static and pumping water levels, will also be measured frequently during pumping of each zone to allow an assessment of pumping dynamics.
Task 2.9 - Collection of Water Samples and Delivery to Laboratory Collection and delivery of water samples is included in Task 2.8.
Task 2.10 - Laboratory Fees
GSI will subcontract with Clinical Laboratory of San Bernardino, Inc., and Eurofins Eaton Analytical, State-certified analytical laboratories located in Grand Terrace and Monrovia, California to provide zone test water quality analyses for up to four (4) zones, and as such, laboratory fees for these analyses are included in our proposal. Although provided by CWSC in 6 •GSI
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the RFP, the recommended water quality analytical suite will be presented to CWSC for review, and approval prior to zone testing.
Task 2.11 - Mechanical Grading Analysis
Based upon visual observation of the lithologic log, and review of the borehole geophysical survey logs, the GSI team will select up to eight (8) formation samples for mechanical grain size (i.e., sieve) analysis. The selected samples will be analyzed using the protocols and procedures detailed in ASTM D6913 "Standard Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis". '. The results of these analyses, along with knowledge of regional aquifer characteristics, will be used to prepare a custom gravel envelope gradation and well screen design for the production well that will offer optimal well efficiency and extended well life.
Task 2.12 - Final Well Design
A properly designed gravel envelope will control production of formation sand while allowing for a highly efficient pumping well. This can be accomplished through conformance with a variety of tactors, including Terzaghi migration and permeability criteria, uniformity coefficients, and pack-aquifer ratios. These factors allow design of a gravel envelope gradation that is sufficiently fine and graded to stabilize fine formation sand, and coarse and uniform enough to allow efficient water flow. Once an appropriate gravel envelope gradation has been designed to complement the formation materials, a screen opening size will be selected to stabilize the gravel envelope. The gravel envelope gradation will be designed based on the results of mechanical grading analysis.
The depth of the well screen interval(s), annular cement seal, and well appurtenances will be selected based on pilot-borehole lithology, geophysical borehole logs, and the results of isolated aquifer zone testing. Additionally, the suitability of the specified borehole and casing depths and diameters, and recommended materials to be used will be vetted based on the results of the exploratory drilling and testing phase. The recommended surface orientation of ancillary tubing will be provided and will be based on the anticipated direction of the discharge from the wellhead, as provided by CWSC. The design letter will include an analysis of depth-specific groundwater quality and yield, and an estimate of completed well water quality and yield based on the proposed final well design. The design recommendations will be provided to CWSC in letter format within 5 days of the completion of the last zone test and will be discussed with CWSC prior to implementation.
Task 2.13 - Borehole Reaming
The GSI team will provide part-time inspection during reaming (i.e., enlargement) of the pilot borehole to an anticipated depth of approximately 560 feet. During drilling, GSI will witness measurement of pertinent drilling fluid parameters to optimize protection of water-bearing formations and borehole integrity. Additionally, GSI will verify that borehole depths and diameters are in conformance with the final well design and technical specifications. For cost estimating purposes, assuming an average drilling rate of 10 feet per hour, and a 24 hour per day work schedule, it is anticipated that borehole reaming will take approximately two (2) to three (3) days to complete. Following borehole reaming, GSI will witness a caliper survey of the enlarged borehole, the purpose of which is to measure and verify borehole diameters and depths prior to well construction.
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Task 2.14 - Well Construction
GSI will provide full-time inspection during installation of the well casing, screen, ancillary tubing, gravel envelope, and annular seals to ensure placement in accordance with the final well design and technical specifications. Installed volumes of the gravel envelope and cement seal will be checked throughout the construction process to verify that there are no bridges and/or voids within the annular space between the well casing and borehole wall. GS team personnel will inspect all construction materials as they are delivered to the site, including the well casing, well screen, ancillary tubing, gravel envelope, and sealing materials. Casing materials will be inspected to verify that dimensions and material types are in conformance with the final well design. Each load of the gravel envelope material will be sampled upon delivery and sieved to verify that the as-delivered gradation meets design parameters. Cement mixes will be compared to design and the time of mixing will be noted to ensure that an extended period has not taken place between mixing and delivery to the site. Cement samples will be collected during installation and submerged in drilling fluid to simulate downhole conditions. These samples will be monitored to ensure that the cement has sufficiently set, particularly when multiple cement pours are specified.
Task 2.15 - Monitor Well Interference
The GSl team hydrogeologist will monitor the impacts of water level interference upon adjacent wells, as identified by CWSC, throughout the well development and testing process.
Task 2.16 - Well Development
Well development is a critical phase of well installation, and successful well development will provide for an efficient well from which aquifer yield and groundwater quality can be assessed.
The goal is to remove as much residual drilling fluids as is considered practical and to grade the gravel envelope and near-well zone such that water can be transmitted efficiently without producing significant formation sand (within sand production tolerances).
The first phase of well development is particularly critical and typically consists of swabbing while simultaneously airlifting or pumping the entire length of well screen in 10-foot increments.
For each interval of screen, sand production will be measured immediately following swabbing, and as the discharge clears. Those intervals exhibiting significant sand production (i.e., greater than approximately 1 mlL) or high turbidity will be targeted for additional development on subsequent passes through the well screen. The GSI team will provide full-time inspection during initial well development.
It has been estimated by CWSC that approximately 70 hours of airlift development will be sufficient to develop the well. This can vary based on many factors, including the drilling fluid properties, formation characteristics, well design, and the actual length of well screen. As such, GSI will review data collected during the development process and provide real-time recommendations regarding the need for additional development. Following demobilization of the drilling rig, GSI will coordinate with the drilling contractor regarding installation of the test pump to ensure that the pump is suitably sized, and that the intake is set at an appropriate depth within a blank section of well casing.
The second phase of well development consists of pumping and surging with a temporary test pump to be furnished by the contractor. During the final development process, pumping will begin at low rates, with no surging, slowly building to the maximum specified pumping rate (typically 1.5x the anticipated design pumping rate). Gentle surging will then begin at lower rates, becoming increasingly aggressive as development progresses. Tests for sand production 8 •GSI
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and specific capacity will be performed throughout the process to measure the progress of development. Once specific capacity approaches a maximum, sand production approaches a minimum, and well performance criteria are met, development is considered complete and the aquifer pumping test phase can begin. GSI will provide part-time inspection during final well development.
CWSC has determined that 40 hours of final well development will be sufficient to properly develop the new well. However, this can vary based on many factors, including the drilling fluid properties, formation characteristics, and final well design. As such, GSI will review data collected during final development and provide real-time recommendations regarding the need for additional development.
Task 2.17 - Aquifer Pumping Tests
The GSI team will provide full-time inspection during an 8-hour step-drawdown pumping test, the purpose of which is to allow calculation of well efficiency and determine an appropriate rate for the constant rate pumping test. During the test, static and pumping water levels, totalizer flowmeter readings, and sand production, will be measured at specified intervals.
Following the step-drawdown test, GSI will provide part-time inspection during the 24-hour constant rate drawdown test, the purpose of which is to determine a recommended instantaneous pumping rate, allow calculation of short- and long-term pumping dynamics, and establish an optimal pump intake setting. As with the step drawdown test, totalizer flowmeter readings and sand production will be measured at specified intervals. Recovering water levels will be measured for a period of four hours following cessation of pumping.
Toward the end of the constant rate pumping test, groundwater samples will be collected by GSI team personnel and submitted to a State-certified laboratory under chain-of-custody protocol for Title 22 and PFOA/PFOS analysis. Field water quality measurements will be collected at the time of sample collection, including pH, temperature, electrical conductivity, dissolved oxygen, total dissolved solids, and turbidity. A flowmeter (i.e., spinner) survey will be conducted approximately 2 hours before cessation of pumping as a means of quantifying depth-specific groundwater flow contribution to the well.
Task 2.18 - Fluid Velocity Spinner Analysis
The flowmeter survey will be conducted under Task 2.18.
Task 2.19 - Downhole Video & Gyroscopic Alignment Surveys The GSl team will provide full-time inspection during a downhole dual-cam video survey to verify and document well construction details and to serve as a record of the as-built condition of the well.
Task 2.20 - Analyze Aquifer Pumping Test Data
Data collected from the aquifer pumping tests, including the results of the flowmeter survey, will be analyzed immediately following completion of testing and upon receipt of the flowmeter survey interpretation provided by the geophysical subcontractor. GSI will use the results of the analyses to make recommendations regarding optimal operational parameters, including instantaneous pumping rate, short- and long-term drawdown characteristics, well efficiency, and recommended pump intake setting. Analysis, results, and recommendations will be presented to CWSC in letter format with appropriate charts, figures, and data. 9 GSI
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Task 2.21 - Contractor Demobilization and Site Cleanup
The GSI team will provide part-time inspection during demobilization and site cleanup to verify that all equipment, materials, and refuse have been removed, and that the site has been returned to its original condition to the satisfaction of CWSC. GSI will also verify that the well has been effectively secured by use of plates and/or lockable covers installed within the well casing and ancillary tubing.
3.0 Reporting
Task 3.1 - Prepare Zone Test Selection Letter
The zone test selection letter will be provided under Task 2.7.
Task 3.2 - Prepare Preliminary Well Design Memo
The final well design letter will be provided under Task 2.12.
Task 3.3 - Prepare Comprehensive Well Summary Report
The GSI team will assemble all relevant construction records from the project and provide this information in a comprehensive written summary report. The report will include a summary of the project, construction timeline, daily field reports, photo log, an inventory of the materials installed, an as-built profile of the well, borehole lithology, pumping test charts, recommended well capacity and pumping dynamics, geophysical surveys, video survey DVDs, field data, and groundwater quality. An electronic draft summary report will be presented to CWSC for review, and, upon incorporation of comments, an electronic copy and three (3) bound hard copies of the final version will be submitted.
Task 4.0 - Permitting Support
Task 4.1 - Prepare Preliminary Drinking Water Source Assessment and Protection (DWSAP) Documents
The GSI team will prepare preliminary Drinking Water Source Assessment and Protection (DWSAP) documents for the proposed well in support of the domestic water supply permit amendment process. Preparation of the DWSAP documents requires identification of all Potentially Contaminating Activities (i.e., PCAs) within two, five- and ten-year protection zones.
These protection zones will be delineated using the modified calculated fixed-radius method, taking into account local groundwater flow direction, anticipated well construction details and pumping capacity, and aquifer parameters. These protection zones will be presented in map form along with identified PCAs. Those PCAs that are identified as posing the greatest environmental risk to the proposed well (if any) will be summarized in a ranked vulnerability inventory and assessed within the DWSAP documents.
The preliminary DWAP documents will be submitted to CWSC in electronic (i.e., PDF) format for review and ultimately forwarded to the State Water Resources Control Board (SWRCB).
Once the well is completed and tested, the preliminary DWAP documents must be updated to reflect actual conditions (i.e., aquifer information, well as-built details, and pumping dynamics) and current PCAs. An optional task to complete these final DWSAP documents is provided as 10 A GSI
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Task 4.2 - Soils Testing Laboratory Services (OPTIONAL) As necessary, GSI will subcontract with a local laboratory to provide laboratory analytical services for STLC and TCLP soils testing for CAM-17 metals. We understand that this is an optional task that is dependent upon the results of TTLC testing to be performed by others Task 5.0 - Recommended Additional Tasks (OPTIONAL)
Task 5.1 - Well Plumbness and Alignment
GSI recommends providing full-time inspection during plumbness and alignment testing of the well to verify acceptable verticality. It is anticipated that this testing will take the form of a gyroscopic alignment survey and will take place at the time of the video survey.
Task 5.2 - Well Disinfection
GSI recommends full-time inspection services during final disinfection of the well structure to verify that suitable chemicals, concentrations, and methods of mixing and emplacement are employed.
Task 5.3 - Prepare Final DWSAP Documents
The GSl team can update the preliminary DWSAP documents to reflect actual conditions following well construction and testing (i.e., aquifer information, as-built details, and pumping dynamics) for submittal to the SWRCB. Protection zones will be recalculated based on actual pumping conditions and aquifer parameters and presented on a revised map with identified potential sources of contamination (PCAs) that pose a risk to groundwater quality at the proposed well site.
GSI Team's Qualifications and Experience -
GSI is a 120-person, employee-owned, water resources and environmental consulting firm with offices in Irvine, Oakland, Sacramento, California and in Austin and Houston, Texas. Our Irvine office currently consists of 38 professionals equally split between engineers and hydrogeologists/scientists. Our company-wide hydrogeology practice has decades of experience in drilling and well installation, aqueous geochemistry, designing and performing aquifer tests, groundwater modeling, and geologic data analysis and visualization. We have designed and overseen the installation of groundwater production wells, nested monitoring wells and injection wells. We have used a wide variety of rapid site investigation tools including Simulprobe, case and bail, and zone testing and have worked with advanced geophysical logging techniques and downhole tools. Our senior staff are often adjunct professors at leading universities and award-winning professionals who have published extensively in the fields of hydrogeology and water resources. We have worked for the City of Commerce on this and other projects and have supported the City with addressing environmental and water resources matters. A detailed description of GSl's qualifications was submitted to the City and is in City's files.
Dr. Hassan Amini is GI's proposed principal-in-charge for this project. He is a California Certified Hydrogeologist and Professional Geologist. He has led previous work on this project and is familiar with the Site and issues related to construction of the well COM 7-2. Mr. Vincent Robino is GSI's assigned project manager and lead geologist for this project. Mr. Robino is a California Professional Geologist who conducted the previous hydrogeological investigation at this site and is familiar with the logistics of the site and subsurface conditions beneath the site. 11 / GSI
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Dr. Amini and Mr. Robino will be supported by GSl's geologists, hydrogeologist, and engineers in southern California on as needed basis.
Subcontractor Qualification
GSI has enlisted Mr. Russell Kyle of Kyle Groundwater, Inc. (KGI), previously at Wood Rogers, as a subconsultant to provide consulting services that complement GS services necessary fo this project. While working at Wood Rogers, Mr. Kyle participated in preparation of the preliminary design for COM 7-02. A summary of KGI's qualifications is provided in Attachment A.
KGI is a California Corporation located in Pomona. KGI company was founded in early 2018 by Mr. Russell Kyle in response to demand for experienced and innovative hydrogeological solutions for Southern California clients. Since they were founded, KGI has established a large local client base of water agencies and purveyors and is continuing to grow. They have reputation of approaching each of their projects with fresh eyes and providing a superior and customized work product. Mr. Kyle, a Professional Geologist and Certified California Hydrogeologist, holds the philosophy that an honest, well-thought-out, innovative, and scientifically based approach coupled with a high-quality work product, leads to successful Over the course of his career, Mr. Kyle has provided hydrogeologic design, construction, and inspection services for over 150 new water supply wells and has successfully evaluated and rehabilitated dozens of wells to stabilize structural abnormalities, recover lost production and improve poor water quality,
Proposed Estimated Budget
GSI proposes to conduct this project in accordance with the terms and conditions of the master services agreement between the City and GSI.
GSl's estimated costs for performing the tasks requested in the RFP and stated here are included in Attachment B. These costs will not be exceeded without prior approval of the City.
Examples of Similar Projects
As requested, descriptions of similar investigations using deep, flooded-reverse drilling method successfully completed by the proposed project team are included in Attachment C.
We appreciate the opportunity to provide this proposal and would welcome to participate and assist the City of Commerce on this important project. If you have any questions, please call Hassan Amini at (949) 242-8283.
Respectfully,
GSI Environmental Inc.
Hussan mene UnAtely
lassan Amini, Ph.D., CHG Vincent Robino, PG
Vice President and Principal Hydrogeologist Senior Geologist Attachment A - Kyle Groundwater, Inc. Qualifications
Attachment B - Proposed Estimated Costs
Attachment C - Project Examples
A GSI
GSI Proposal No. 9001167 ENVIRONMENTAL
PROPOSAL FOR ENGINEERING SUPPORT SERVICES DURING WELL CONSTRUCTION Well 7-02
Commerce, California
ATTACHMENT A
Kyle Groundwater, Inc. Qualifications
COMPANY PROFILE
KYLE GROUNDWATER, INC. (I KYLE Groundwater
KYLE Groundwater, Inc. (KGI) is a California Corporation located in Pomona. Our company was founded in carly 2018 by Mr. Russell Kyle in response to demand for experienced and innovative hydrogeological solutions from our Southern California clients. Since that time, we have established a large local client base of water agencies and purveyors, and are continuing to grow. We have a reputation of approaching each of our projects with fresh eyes and providing a superior and customized work product. Mr. Kyle, a Professional Geologist and Certified California Hydrogeologist, holds the philosophy that an honest, well-thought-out, innovative, and scientifically based approach coupled with a high-quality work product, leads to successful projects. The number and variety of successful projects over the course of his career is testament to that fact.
Over the course of his career, Mr. Kyle has provided hydrogeologic design, construction, and inspectior services for over 150 new water supply wells and has successfully evaluated and rehabilitated dozens of well to stabilize structural abnormalities, recover lost production and improve poor water quality. Services offered by KGI include, but are not limited to:
Water Wells Groundwater Basin Studies Well Rehabilitation and Redevelopment Siting Regional Studies Well Condition Assessment
Feasibility Studies Groundwater Quality Well Efficiency Testing Characterization Down-Hole Video Interpretation
Design
Technical Plans & Specifications Perennial Yield Estimates Flow Profiling Construction Management Artificial Recharge Feasibility Water Quality Assessment Inspection Well Field Optimization Mechanical and Chemical Peer Review Groundwater Protection Treatment
Well Maintenance Programs Well Modification
Permitting Support Well Repair
Water Supply Studies Groundwater Exploration • Liner Design Source Assessments (DWSAP) Exploratory Drilling Technical Plans & Specifications Domestic Water Supply Permit Construction Management
Monitoring Wells • Inspection
• Control Zone Compliance Depth-Specific Sampling
Setback Compliance Well Canvassing
• GSI
GSI Proposal No. 9001167 ENVIRONMENTAL
PROPOSAL FOR ENGINEERING SUPPORT SERVICES DURING WELL CONSTRUCTION Well 7-02
Commerce, California
ATTACHMENT B
Proposed Estimated Costs
GSI Proposal No. 9001167 •GSI
Issued: 25 April 2022 EIVIRDNHENTAL
1 of 3
Attachment B: Proposed Estimated Costs
Proposal for Engineering Support Services During Well Construction - Well 7-02 Commerce, Califomia
Senior Staff Technician / Administrative LABOR OTHER TOTAL TASK DESCRIPTION Geologist oRydrologist Genir stegiet Gondologie Drafter (Labor + HOURS COST other)
Hourly Rate: $325 $215 $145 $125 $115 $85
1.0 PRE-CONSTRUCTION SUPPORT
1.1 Perform Preliminary Investigation and Background Research $650 $860 $0 $0 so $0.00 $1,510.00
1.2 Perform Hydrogeological Assessment $1,300 $860 $0 $0 $0 $0.00 $2,160.00
1.3 production capacity for tre planing, including praying bret leter $1,300 $1,720 $580 $0 $0.00 $3,600.00
1.4 Ground Water Quality Assessment $650 $860 $0 $0.00 $1.510.00
1.5 Review Cal Water Plans, Specifications and provide comments 325 215 so $0 $858.00 $1,398.00 Attend pre-construction meeting with driling contractor & Cal Water $488 $323 so $1,122.00 $1,932.00
1.6 (prior to mobilization)
Task 1 Subtotal: $12.110.00
2.0 WELL DRILLING INSPECTION AND DESIGN SERVICES
2.1 Oversight during mobilization (including inspection of drilling contractor's $650 $860 $2,320 $0.00 $0.0 $0.00 $250.00 $4,080.00 equipment)
2.2 Oversight during sound curtain installation (part time) $650 $860.00 $2,320.00 $0 so $125.00 $3,955.00
2.3 On-site inspection of conductor casing installation (full-time) $325 $860 $1,740 17 $250.00 $3,175.00
2.4 On-site inspection during pilot borehole drilling (full-time) $1,950 $3,440 $10,440 $0 94 $8,861.00 $24,691.00 Collection & logging of formation samples using the Unified
2.5 Classification System (USCS) during pilot borehole drilling (Cost $0.00 $0.00 included in Task 2.4 above]
2.6 On-site inspection during geophysical borehole logs (full time) $1,300 $430 $1,740 16 $1,355.50 $4,825.50 Selection of zones for isolated aquifer testing with memo recommending $323 so $1,980.00 $2,790.00
2.7 $488
which zones to test (one hard copy & one PDF)
On-site inspection during isolated aquifer testing for four zones (part- $975 $1,290 $3,480 $19,274.00 $25,019.00
2.8 time, assume four (4) zones)
Collection of water quality samples & delivery to laboratory, assume four $0.00 $0.00
2.9 zones (Cost included in Task 2.8 above)
Water quality analyses for four zones [collected from Task 2.9 abovej by an ELAP certified drinking water lab to include: General mineral and
2.10 physical, ammonia, color, methane, TOC, diesel and gasoline range, $0 $9,640.00 $9,640.00 VOC, total sulfides, total petroleum hydrocarbons, (assume 3 day tumaround time for results).
2.11 Mechanical grading sieve analysis (assume eight [8] formation samples) $325 $215 $0 $0 $660.00 $1,200.00 Tsue: 2 AN 001167 •GSI
ENVIRONMENTAL
Attachment B: Proposed Estimated Costs
Proposal for Engineering Support Services During Well Construction - Well 7-02 Commerce, Califomia
TASK DESCRIPTION Senior Project Senior Staff Staff Technician / Administrative LABOR TOTAL Geohydrologist Geohydrologist Geohydrologist Geohydrologist Drafter OTHER (Labor + HOURS COST other)
Hourly Rate: $325 $215 $145 $125 $115 $85
Provide recommended final well design (including gravel pack
2.12 gradation, slot size, perforated and blank casing depths and diameters, $1,300 $860 and depth of annular seal resented in fetter format; assumes one hard $5,918.00 $8,078.00 Cops and one citectroning pit. Borehole reaming and cliper vogging
2.13 (part-time) $975 $1,290 $5,220 $7,735.00
2.14 On-site inspection during Well Construction; installation of well $1,300 $2,150 $6,960 so $19,941.00 $30,351.00 appurtenances, filter pack and annualar seal (full-time)
2.15 Monitor well interference with adjacent wells during dilling and testing $650 $B60 $1,740 so $0.00 $3.250.00 activities.
2.16 On-site inspection during Well Development (part-time) $1,788 $2,365 $6,380 60.5 $5,687.00 $16,219.50
2.17 On-site inspection during Pump testing: Step drawdown, constant rate $975 $1,290 $1,740 so $7,240.50 $11,245.50 and recovery (part-time, including cost for transducer)
2.18 Fluid Velocity "Spinner" Analysis (dynamic and static) $0 $0 so $0.00 $0.00
2.19 Video logging and test pump data analysis $650 $1,450 $170 $1,402.50 $4,102.50
2.20 Data Analysis (test pumping, water quality spinner log) $1,300 $860 $0 $4,774.00 $6,934.00
2.21 Oversight during demobilization so $430 $2,320 $2,421.00 $5,171.00 Task 2 Subtotal: $172,462.00
3.0 REPORTING
3.1 Zone Testing design letter (electronic delivery) $0 $0 $0.00 $0.00 Preliminary design memo documenting proposed construction (two hard $0 so $0 $0.00 $0.00 copy & one PDF)
3.3 copies & one PoPor documenting work & recommendations (wo hard $1,300 $1,290 $1,160 $125 $115 $85 $4,609.00 $8,684.00 Task 3 Subtotal: $8,684.00
4.0 PERMITTING SUPPORT
Preparation of Preliminary DSWAP Report for Well 07-02, Identication $1,950 $2,150 $2,320 of Potentially Contaminating Activities $1,000 40 $7,420.00 OPTIONAL LABORATORY SERVICES - Additional STLC and TCLP Soils Testing for CAM-17 Metals, if required (Based on Results of TTL $o $0 $0 $0.00 $0.00 Testing.) Includes 10% Mark up on Subcontractors Cost is per sample Task 4 Subtotal: $7,420.00
GS Proposal No. 9001167 •GSI
Issued: 25 April 2022 EXVIRONMENTRL
3 of 3
Attachment B: Proposed Estimated Costs
Proposal for Engineering Support Services During Well Construction - Well 7-02 Commerce, Califomia
Senior Project Senior Staff Staff Technician / Administrative LABOR OTHER TOTAL TASK DESCRIPTION Geohydrologist Geohydrologist Geohydrologist Geohydrologist Drafter (Labor + HOURS COST other)
Hourly Rate: $325 $215 $145 $125 $115 $85
5.0 RECOMMENDED ADDITIONAL TASKS (OPTIONAL)
5.1 inspect well plumbness and alignment testing (full time). $650 $860 $1,740 $0 so $0.00 $3.250.00
5.2 Inspect final well disinfection (full-time). $430 $290 30 $1,320.00 $2,040.00
5.3 Prepare final DWAP documents. $1,300 $1,290 $870 $0 $0 16 $0.00 $3,460.00 Task 5 (OPTIONAL TASK) Subtotal: $8,750.00
TOTAL HOURS AND COST (NON-OPTIONAL TASKS): $23,563 $51,910 $1,125 565.5 $96,618.50$200,676.00 TOTAL HOURS AND COST (OPTIONAL TASKS): $1,950 $2,580 $2,900 so so $1,320.00 $8,750.00 TOTAL HOURS AND COST (NON-OPTIONAL AND OPTIONAL TASKS): $25,513 $29,670 $54,810 51,125 $119 $255 608.5 |$97,938.50 $209,426.00 Assumptions
2.4 Assumes average drilling rate of 10ft per hour and borehole total depth of approximately 560 feet.
2.8 GSI assumes 1.5 days per zone test for 4 tests at 50% time • GSI
GSI Proposal No. 9001167 ENVIRONMENTAL
PROPOSAL FOR ENGINEERING SUPPORT SERVICES DURING WELL CONSTRUCTION Well 7-02
Commerce, California
ATTACHMENT C
Project Examples
• GSI
GSI Proposal No. 9001167 ENVIRONMENTAL
Permitting, Design, and Installation of DOM 300-01
California Water Service Company, Dominguez, CA
As a direct result of the groundwater development study and master plan completed in 2016, CWSC proposed installation of several new high-capacity production wells in the Dominguez District to optimize local supplies within the Central Basin and maximize groundwater supply.
The proposed location required close coordination with the California State Water Resources Control Board Division of Drinking Water (DDW) due to a violation of the 50-foot control zone requirement, and concerns regarding nearby sites of environmental concern. Additionally, the location of the well is immediately adjacent to a fire station and precipitated concerns that groundwater contamination from PFOA and PFOS was possible.
The well was ultimately permitted and KGI provided design and field inspection services throughout each phase of well construction. This included collecting depth-specific samples during isolated aquifer zone testing such that an assessment of the concentration of constituents of concern, including PFOS and PFOA, could be made. Due to the static water level and aquifer thickness, KGI presented CWSC with a weil design that would allow for the pump to be set deeper in the future, if need be. The well has been constructed and is anticipated to produce in excess of 2,000 gpm with an associated specific capacity of 50 gpm/foot
Location
Compton, California
Personnel
Russell Kyle, Project
Manager/Hydrogeologist
Kimberly Makar, Hydrogeologic
Support/Field Inspection
Mike Dykstra, Field Inspection
Ailco Wolf, Field Inspection
Client
California Water Service Company
Clyde Arucan, PE
[email protected]
310-257-1447
Completion Date
June 2020
Total Cost 12.5000
$84,000
GSI Proposal No. 9001167 ENVIRONMENTAL
Permitting, Design, and Installation of Well No. 8
South Montebello Irrigation District, Montebello, CA
Mr. Kyle was the technical lead for a new well installation to be located adjacent to the Rio Hondo Spreading Basins within the Montebello Forebay area of the Central Basin. An assessment of the proposed well site was conducted, including anticipated well capacity and groundwater quality, preliminary design, construction logistics, and identification of construction constraints and required permits.
Specific project tasks included preparation of a preliminary design report, technical plans and specifications, and comprehensive well permitting (including CEQA, NPDES, the Domestic Nater Supply Permit Amendment, and DWSAP documents). Permitting proved challenging given that the well did not initially meet DDW's 50-foot control zone requirement but the wel was ultimately permitted for drilling and operation and has entered the construction phase, for which KGI is currently providing construction management and inspection services.
Given the location of the well within the Montebello Forebay, PFOA and PFOS constituents are a very real problem. As such, KGI collected depth-specific samples during isolated aquifer zone testing such that an assessment of the concentration of these constituents from the completed well could be estimated. Sampling and analysis was successfully completed under very difficult conditions, resulting in representative results over a very short turn-around time. The well has been constructed and is anticipated to produce in excess of 3,000 gpm with an associated specific capcity of 73 gpm/foot. Advanced knowledge of the presence of PFOA and PFOS within the groundwater enabled advanced planning for a centralized treatment system.
Location
Montebello, California
Personnel
Russell Kyle, Project
Manager/Hydrogeologist
Kimberly Makar, Permitting/GIS
Mike Dykstra, Field Inspection
Ailco Wolf, Field Inspection
Client
South Montebello Irrigation District
Jordan Betancourt
[email protected]
323-721-4735
Completion Date
October 2020
Total Cost
$97,848
A GSI
GSl Proposal No. 9001167 ENVIRONMENTAL
Permitting and Preliminary Design - DOM 300-01 and DOM 299-01* California Water Service Company, Dominguez, CA
In an effort to maximize local groundwater rights within the Dominguez District, CWSC identified several sites as potential sites for new water supply wells. Two of those sites included DOM 300-01 located in Compton, California, and DOM 299-01 located in Long Beach, California.
Each site was vetted by conducting hydrogeological, groundwater quality, and constructability reviews.
The scope of work included an assessment of anticipated well yield, groundwater quality, environmental risk, preliminary well design, construction logistics, and identification of construction constraints and required permits. Project deliverables included risk assessment and preliminary design reports, and preparation of preliminary Drinking Water Source Assessment and Protection (DWSAP) program documents.
Both potential well sites were found to be feasible and KGI provided construction management and inspection services for Well DOM 300-01, completed in June 2020. *Portions of these projects were performed by key team members while working with another firm.
Location
Carson, California
Personnel
Russell Kyle,
Project Manager/Hydrogeologist
Kimberly Makar, Permitting/GIS
•
Client
California Water Service
Company
Clyde Arucan, PE
[email protected]
310-257-1447
Completion Date Proposed Wes DOM 300-01
LUST Cleanup Site - Closed
2017 (DOM 299-01)
Chanup Program Site - Open
2018 (DOM 300-01) Cleanup Fragram Site - Olosed
Land Diaposal Site - Open
Land Diaposal Site • Closed
DOM 300-01 Permitted Underground
Storage Tank
Screamed Inters (f
1940013 noing Capadty (gam) 2,000 Groundwater Flow Direction Cal. Water Service
2- Year Capture Zone
Community
5 - Yea: Capture Zone
12 (r)
Destriket Nume AS INI 17ie 10 - Year Capture Zone
DWSAP CAPTURE ZONES
CALIFORNIA WATER SERVICE COMPANY KYLE Groundwater
WELL DOM 300-01
PRELIMINARY DWSAP
COMPTON, CALIFORNI 1,000
MARCH 201
Feet
NGSI
GSI Proposal No. 9001167 ENVIRONMENTAL
Drilling and Equipping of Alamitos Well 9A and 14
Long Beach Water Department, Long Beach, CA
The Long Beach Water Department (LBWD) is seeking to increase water supply reliability, LBWD is seeking to optimize local water supply by maintaining a production well field capacity of 32,692 acre-feet per year (AFY) through the year 2032. Due to the advanced age and poor condition of the well field, it is anticipated that reaching this goal will require rehabilitation of 19 existing wells to increase production from existing sources of supply, and construction of at least 12 new wells. Based on recommendations of the Collection Main and New Well Site Study prepared by KGI, a plan was implemented to install 12 new water supply wells within the next 10 years, with installation of at least 7 new wells over the five-year period from 2020 through 2024. This project, along with installation of two new wells within the North Long Beach well field represent the first steps toward meeting this goal.
KGI is tasked with providing services to support destruction of three existing wells along with installation of the two new wells within Stearns Park. The scope of work includes well siting, permitting, preliminary well and equipping design, final design and preparation of technical specifications, bidding, and construction management and inspection. Particular challenges of this project include a difficult permitting environment combined with logistical considerations of installing wells within a heavily utilized park.
Location
Long Beach, California
Personnel
Russell Kyle,
Project Manager/Hydrogeologist
COM 13
Kimberly Makar, Permitting/GIS ANX 201
Michael Dykstra,
'ALA 9A
Hydrogeology/Inspection • MALA 14 ALAS
Jerry Burns,
Hydrogeology/Inspection
Client
Long Beach Water Department
Marzena Laskowska
[email protected]
562-505-0524
Completion Date
Est. October 2024
Total Cost
$1.81 Million
GSI Proposal No. 9001167 ENVIRONMENTAL
Innovative Installation of a Nested Monitoring Well (Montebello No. 2) in Los Angeles County
Water Replenishment District of Southern California, Montebello, CA GSI managed the installation of a five-nested groundwater monitoring well to a depth of 790 feet within the Central Groundwater Basin of Los Angeles County. Geophysical logs, sieve analysis results, and the boring log of the pilot hole was used to design the well screens. The well system consisted of five, 2.5-inch diameter casings installed in nested arrangement to multiple depths using innovative centralizers to provide proper spacing and isolated monitoring zones to meet DWR requirements. Each well casing was hydraulically tested using pneumatic procedures to confirm the integrity of the well seals and isolation of the monitoring zones and to determine the conductivity of each aquifer zone.
Applicability/Project Relevance
Interpretation of subsurface conditions and
successful installation and completion of a
multi-nested groundwater monitoring well.
Hydraulic evaluation of the multiple
aquifers including the Gaspur, Gage,
Silverado, Sunnyside, and Pico.
Reference
Brian Partington, WRD, Manager of
Hydrogeology
[email protected]
562-275-4249
Project Budget
Projected: $130,100 | Completed:
$129,989
Project Schedule
01/2021 - 08/2021
Constraints
Special considerations included 24-hour
drilling and development in a busy park
setting and residential neighborhood over
the Easter holiday.