ITEM 4. 16
CITY MANAGER' S REPORT
OCTOBER 14, 2024 CITY COUNCIL REGULAR MEETING
ITEM:
RECOMMENDATION:
APPROVE AMENDMENT NO. 3 WITH CAROLLO
ENGINEERS, INC. FOR AQUIFER STORAGE AND
RECOVERY, CIP PW 22- 36
Adopt Resolution Approving Amendment No. 3
to the Professional Services Agreement with
Carollo Engineers, Inc., for Aquifer and Storage
Recovery, CIP PW 22- 36
SUMMARY:
On January 10, 2022, City Council approved the creation of Capital Improvement Project ( CIP) PW 22- 36, Aquifer Storage and Recovery ( ASR), including a Professional Services Agreement ( PSA) with Carollo Engineers, Inc. (Carollo) to complete an engineering feasibility study and preliminary project design. In April 2023, Amendment No. 1 was approved with Carollo for tasks related to the design and bidding phases of the project. Also, in August 2023, Amendment No. 2 with Carollo was approved to provide grant administration support services and to increase the target drilling depth of a new monitoring well.
Staff is proposing to advance the supplemental geochemical testing to evaluate whether pH adjustment of the water is required, which could result in a potential cost savings of $ 1. 2M if it is determined this can be eliminated.
Staff is requesting City Council approve Amendment No. 3 in the amount of $198, 476 with Carollo. Sufficient funds have been allocated in the approved fiscal year budget 24/5 for CIP PW 22- 36.
BACKGROUND:
The City' s drinking water comes from two sources, local groundwater and surface water purchased from the South San Joaquin Irrigation District ( SSJID). The City' s water supply historically has been reliable and staff has taken the necessary steps to plan for future growth and the corresponding water needs. An ASR project allows for improved reliability of the City' s
water supplies by pumping and storing surface water
purchased from the SSJID during wet seasons into the ground for subsequent recovery and use during dry seasons, times of drought, or water supply shortage.
On December 12, 2022, Council approved a resolution authorizing a grant application, acceptance and execution for grant funding through the 2022 Urban Community Drought Relief Grant Program ( UCDRGP) administered by the Department of Water Resources ( DWR).
CITY MANAGER' SREPORT PAGE 2
OCTOBER 14, 2024 CITY COUNCIL REGULAR MEETING
APPROVE AMENDMENT NO. 3 WITH CAROLLO ENGINEERS, INC. FOR AQUIFER STORAGE AND RECOVERY, CIP PW 22- 36
On June 9, 2023 DWR issued the Award Notification to the City to inform that the City of Lathrop was awarded $ 4, 500, 000 for the UCDRGP.
On August 14, 2023, Council approved Amendment No. 2 with Carollo for the additional tasks needed for grant administration support and to add additional depth for a second monitoring well.
Carollo has completed the draft Basis of Design Report which recommends supplemental geochemical testing to confirm if pH adjustment is required. The cost of this work was originally intended to have been part of the drilling construction contract, but it makes better sense now to complete this as a separate work element before the new well is drilled). If the sampling does confirm that pH adjustment is not required, then it will result in a significant cost savings.
REASON FOR RECOMMENDATION:
Amendment No. 3 with Carollo is requested to provide supplemental geochemical testing and analysis of the aquifer to evaluate whether pH adjustment is required, which could result in an estimated cost savings of $1. 2M if it is determined that it can be eliminated.
FISCAL IMPACT:
The cost of Amendment No. 3 to provide the supplemental geochemical testing is 198, 476. Sufficient funds have been allocated in the approved fiscal year budget 24/5for CIP PW 22- 36.
ATTACHMENTS:
A. Resolution Approving Amendment No. 3 with Carollo Engineers, Inc., for Aquifer and Storage Recovery Well Design Services, CIP PW 22- 36 B. Amendment No. 3 with Carollo Engineers, Inc. for Aquifer Storage and Recovery Well Design Services, CIP PW 22- 36
RESOLUTION NO. 24-
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF LATHROP APPROVING AMENDMENT NO. 3 TO THE PROFESSIONAL SERVICES
AGREEMENT WITH CAROLLO ENGINEERS, INC., FOR AQUIFER AND STORAGE RECOVERY, CIP PW 22- 36
WHEREAS, on January 10, 2022, City Council approved the creation of Capital Improvement Project ( CIP) PW 22- 36, Aquifer Storage and Recovery ( ASR), including a Professional Services Agreement ( PSA) with Carollo Engineers, Inc. (Carollo) to complete an engineering feasibility study and preliminary project design; and WHEREAS, in April 2023, Amendment No. 1 was approved with Carollo for tasks related to the design and bidding phases of the project; and WHEREAS, on August 14, 2023, Council approved Amendment No. 2 with Carollo for the additional tasks needed for grant administration support and to add additional depth for a second monitoring well; and
WHEREAS, Amendment No. 3 with Carollo is requested to provide supplemental geochemical testing and analysis of the aquifer to evaluate whether pH adjustment is required, which could result in a potential capital cost savings of $ 1. 2M if it is determined they could be eliminated; and
WHEREAS, sufficient funds have been allocated in the approved fiscal year budget 24/5 for CIP PW 22- 36.
NOW, THEREFORE, BE IT RESOLVED, the City Council of the City of Lathrop does hereby approve Amendment No. 3 with Carollo Engineers, Inc. in the amount of $ 198, 476 for additional geochemical testing and analysis, CIP PW 22- 36 Aquifer Storage and Recovery.
CITY MANAGER' SREPORT PAGE 3
OCTOBER 14, 2024 CITY COUNCIL REGULAR MEETING
APPROVE AMENDMENT NO. 3 WITH CAROLLO ENGINEERS, INC. FOR AQUIFER STORAGE AND RECOVERY, CIP PW 22- 36
APPROVALS:
Jap.,
Greg Gibs goh Date
Senior Civil Engineer
Brad T lor
City Engineer
Cari Jam
Finance ector
0/ f -A92- f
o(z/ 202y
Date
Date
Michael King Date
Assistant City Manager
2 03/ X2. 2
Io• y• zoZ' i
Salvador Navarrete
Zte) ZY
Date
City Attorney
Iv •7. 251
Steen J. Salvatore Date
City Manager
The foregoing resolution was passed and adopted this 14th day of October 2024, by the following vote of the City Council, to wit:
AYES:
NOES:
ABSTAIN:
ABSENT:
Sonny Dhaliwal, Mayor
ATTEST: APPROVED AS TO FORM:
Teresa Vargas, City Clerk Salvador Navarrete, City Attorney
ATTACHMENT
3 11
AMENDMENT NO. 3
TO THE AGREEMENT BETWEEN THE CITY OF LATHROP AND
CAROLLO ENGINEERS, INC.
TO PROVIDE THE LATHROP AQUIFER STORAGE AND RECOVERY WELL DESIGN SERVICES, CIP PW 22- 36
THIS CONTRACT AMENDMENT ( hereinafter " AMENDMENT NO. 3") to the agreement between Carollo Engineers, Inc. and the City of Lathrop dated January 10, 2022, (hereinafter AGREEMENT") dated for convenience this day of October, 2024, is by and between the City of Lathrop, a California municipal corporation (" CITY") and Carollo Engineers, Inc.
CONSULTANT");
RECITALS:
WHEREAS, CONSULTANT is specially trained, experienced, and competent to Professional Engineering Consulting Services, which are required by this agreement; and WHEREAS, CITY selected the CONSULTANT pursuant to said qualifications; and WHEREAS, on January 10, 2022, CONSULTANT and CITY entered into an AGREEMENT to provide the Lathrop Aquifer Storage and Recovery and Feasibility Study and Funding Support, CIP PW 22- 36, not to exceed $ 301, 744; and WHEREAS, on April 10, 2023, CONSULTANT and CITY entered into Amendment No. 1 to provide the Lathrop Aquifer Storage and Recovery Well Design Services, CIP PW 22- 36, not to exceed $ 1, 547, 242; and
WHEREAS, on August 14, 2023 CONSULTANT and CITY entered into Amendment No. 2 to provide Lathrop Aquifer Storage and Recovery Well Design Services, CIP PW 22- 36, not to exceed $ 1, 547, 242; and
WHEREAS, CONSULTANT has provided CITY with a scope of work attached hereto as Exhibit "A" for Amendment No. 3 to provide Lathrop Aquifer Storage and Recovery Well Design Services, CIP PW 22- 36, not to exceed $ 198, 476.
NOW, THEREFORE, CONSULTANT and the CITY agree as follows:
AMENDMENT NO. 3 TO AGREEMENT
1) Scope of Service. Section ( 1) of the AGREEMENT is hereby amended to add the following:
CONSULTANT agrees to perform Engineering Services in accordance with the scope of work and fee proposal provided by CONSULTANT, attached hereto as Exhibit " A" in addition to the scope of work in the original AGREEMENT dated January 10, 2022 and Amendment No. 1 dated April 10, 2023, and Amendment No. 2 dated August 14, 2023.
CITY OF LATHROP — CAROLLO ENGINEERS, INC.
AMENDMENT NO. 3 TO PROVIDE AQUIFER STORAGE AND RECOVERY WELL DESIGN SERVICES, CIP PW 22- 36
CONSULTANT agrees to diligently perform these services in accordance with the upmost standards of its profession and to CITY' Ssatisfaction. 2) Compensation. Section ( 2) of the AGREEMENT for Consulting Services is hereby amended as follows:
City hereby agrees to pay CONSULTANT an additional cost of $ 198, 476 for the services set forth in Exhibit " A" of this AMENDMENT NO. 3, with a total sum not to exceed of 2, 130, 619 ($301, 744 for the original AGREEMENT, $ 1, 547, 242 for AMENDMENT NO. 1, $ 83, 160 for AMENDMENT NO. 2, and $ 198, 476 for AMENDMENT NO. 3).
CONSULTANT shall be paid within thirty ( 30) days of receipt of billings containing all information contained in Paragraph 5 of the original AGREEMENT. Compensation for any task must be equal to or less than the percentage of task complete. In no event shall CONSULTANT be entitled to compensation for work not included in the original scope of work and this AMENDMENT unless a written change order or authorization describing the extra work and payment terms has been executed by CITY' SAuthorized Representative prior to the commencement of the work.
3) Effective Date and Term
The effective date of AMENDMENT NO. 3 is October , 2024, and it shall terminate no later than the term of the AGREEMENT. AMENDMENT NO. 3 hereby extends the term of the original AGREEMENT to June 30, 2026. All other terms of the original AGREEMENT shall remain in full force and effect.
4) Applicability to Original Consultant AGREEMENT
All terms and conditions set forth in the AGREEMENT dated January 10, 2022 are still in effect and are incorporated by reference herein and said AGREEMENT is incorporated by reference herein.
5) Signatures
The individuals executing this AMENDMENT NO. 3 represent and warrant that they have the right, power, legal capacity, and authority to enter into and to execute this AMENDMENT NO. 3 on behalf of the respective legal entities of the CONSULTANT and the CITY. This agreement shall inure to the benefit of and be binding upon the parties hereto and their respective successors and assigns.
CITY OF LATHROP — CAROLLO ENGINEERS, INC.
AMENDMENT NO. 3 TO PROVIDE AQUIFER STORAGE AND RECOVERY WELL DESIGN SERVICES, CIP PW 22- 36
Approved as to Form: City of Lathrop
City Attorney
Salvador Navarrete Date
Recommended for Approval: City of Lathrop
Assistant City Manager
Approved by:
Resolution No:
Consultant:
Michael King
City of Lathrop
390 Towne Centre Drive
Lathrop, CA 95330
Date
Stephen J. Salvatore Date
City Manager
Carollo Engineers, Inc.
2880 Gateway Oaks Drive, Suite 300
Sacramento, CA
Federal ID # 86- 0899222
Lathrop Business License # 20758
Signature Date
Print Name and Title
Signature Date
Print Name and Title
XHIBIT " A "
AMENDMENT 3
SCOPE OF SERVICES
CITY OF LATHROP
AND
CAROLLO ENGINEERS, INC.
AQUIFER STORAGE AND RECOVERY WELL DESIGN
BACKGROUND
Initial geochemical analyses from groundwater samples collected from two monitoring wells MW -1 and MW -2) indicate that pH adjustment would be required to lower the pH of the South San Joaquin Irrigation District ( SSJID) supplied surface water prior to recharge (injection) to match the chemical profile of the target aquifer groundwater quality. Subsequently, during pumping ( extraction) the pH of the recovered water would have to be increased to match that of the City' s distribution system. As described in the Draft Basis of Design Report, extended geochemical testing is recommended to confirm if pH adjustments ( during injection and extraction) will in fact be required. If the additional testing is not implemented, then provisions for future installation of pH adjustment equipment will have to be incorporated into the final design, as described in the draft BODR.
A two- phase recharge series is recommended for the two deepest intervals in MW - 1 ( depth of 510 and 740 feet) and MW -2 ( depths of 740 feet and 990 feet).
PURPOSE OF AMENDMENT
This amendment modifies the Agreement between the City of Lathrop ( CITY) and Carollo Engineers ( CONSULTANT) to include the following:
Conduct two- phase recharge testing at MW -1 and MW -2 and laboratory analyses to confirm chemical adjustment requirements ( pH) for ASR well design.
CONSULTANT' SSERVICES
Add the following to Task 2. 4:
Task 2. 4 Monitoring Well Installation and Analyses
To LSCE will conduct two- phase recharge series testing to determine if pH adjustment of the injected and recovered water is required. The testing will consist of the following:
Phase 1 ( One Day Test): Water sourced from SSJID will be injected into the two deepest monitoring wells at both MW -1 ( depths of 510 feet and 740 feet) and MW -2 ( depths of 740 feet and 990 feet). This injection will occur continuously at a rate of approximately 5 gallons per minute ( gpm) over a 24 -hour period ( 1 day). Following the injection, the wells will remain idle for another 24 hours ( 1 day). After this idle period, the wells will then be pumped continuously for a subsequent 24 hours ( 1 day). pw:// Carollo_ 200000/ Documents/ CA\ Lathrop1200919- 000000101 Project Management101 Pre -Contract\ DesignWmdn3_ SOW September 2024
During both the injection and extraction phases, field parameters such as temperature, pH, specific conductivity, turbidity, oxidation- reduction potential ( ORP), and total dissolved solids ( TDS) will be measured. Specifically, during the extraction phase, water samples will be collected and submitted to two different laboratories for analysis.
Laboratory samples will be taken at intervals of 0, 6, 12, 18, and 24 hours, resulting in five ( 5) samples per well. These samples will be analyzed for silica, aluminum, dissolved and total iron, total manganese, total arsenic, calcium, magnesium, sodium, potassium, total alkalinity, sulfate, chloride, total organic carbon, total dissolved solids, total suspended solids, specific conductance, pH, and methane.
Phase 2 (Seven Dav Test): Water sourced from SSJID will be injected into the two deepest monitoring wells at both MW -1 ( depths of 510 feet and 740 feet) and MW -2 depths of 740 feet and 990 feet). This injection will occur continuously at a rate of approximately 5 gallons per minute ( gpm) over a 168 -hour period ( 7 days). Following the injection, the wells will remain idle for another 168 hours ( 7 day). After this idle period, the wells will then be pumped continuously fora subsequent 168 hours ( 7 day).
During both the injection and extraction phases, field parameters such as temperature, pH, specific conductivity, turbidity, oxidation- reduction potential ( ORP), and total dissolved solids ( TDS) will be measured. Specifically, during the extraction phase, water samples will be collected and submitted to two different laboratories for analysis.
Laboratory samples will be taken at intervals of 0, 1, 2, 3, 4, 5, 6 and 7 days, resulting in eight ( 8) samples per well. These samples will be analyzed for silica, aluminum, dissolved and total iron, total manganese, total arsenic, calcium, magnesium, sodium, potassium, total alkalinity, sulfate, chloride, total organic carbon, total dissolved solids, total suspended solids, specific conductance, pH, and methane.
Technical Memorandum: After the completion of both phases, a summary report will be prepared. This report will include the following:
1. Introduction: The introduction will provide an overview of the project objectives and scope, along with a description of the monitoring wells and their respective depths.
2. Methodology: This section will include a detailed explanation of the injection and extraction procedures for both phases, as well as the monitoring techniques and equipment used for measuring field parameters.
3. Results: The results section will present the data collected during the injection and extraction phases. It will include graphs and tables summarizing the changes in field parameters over time, and the laboratory analysis results for water samples collected at specified intervals.
4. Analysis and Discussion: This section will interpret the results, highlighting key findings and trends. It will compare data between Phase One and Phase Two and assess the impact of quality on injected and extracted groundwater quality.
5. Conclusions and Recommendations: The conclusions and recommendations section will summarize the overall findings from both phases. It will provide recommendations for future water management and injection strategies based on the results and suggest further studies or monitoring if necessary.
Findings from the Technical Memorandum will be incorporated into the final BODR. pw:// Carollo_ 200000/ Documents/ CA\ Lathrop\ 200919- 000000101 Project Management101 Pre - Contract\ DesignAmdn3_ SOW September 2024
TIME OF PERFORMANCE
CONSULTANT will schedule field activities following receipt of Notice to Proceed and an executed amendment. The two- phase field work under this scope would be completed prior to drilling of the ASR well.
PAYMENT
Payment to the CONSULTANT for services performed under this Amendment shall be based on the revised fee table below, consistent with the terms of the Agreement, on a lump sum basis.
Task
Current
Total')
Amend. 3
Change
Revised
Total
Feasibility Study Subtotal 301, 744 301, 744
Design Phase
Task 1 — Project Coordination & Admin. 131, 702 131, 702 Task 2 — Data Collection and PDR 599, 077 198, 473 797, 550 Task 3 — DWSAP Report 47, 335 47, 335
Task 4 — Detailed Design 783, 887 783, 887
Task 5 — Permitting Assist. 11, 348 11, 348
Task 6 — Bidding Assist. 34, 893 34, 893
Task 7 — Grant Admin. Support 22, 160 22, 160
Design Phase Subtotal 1, 630, 402 198, 476 1, 828,75
Total 1, 932, 146 198, 476 2, 130, 619
1) Inclusive of Amendment 1 ( executed 5/ 16/ 23) and Amendment 2 ( executed 8/ 23/3).
The revised not -to -exceed cost limit to the CONSULTANT' sservices, excluding Engineering Services During Construction and Commissioning tasks ( to be reflected in a future amendment), shall be $ 2, 130, 619.
pw:// Carollo_ 200000/ Documents/ CA\ Lathrop1200919- 000000101 Project Management101 Pre- Contract\ DesignWmdn3_ SOW September 2024
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