SERVICES AGREEMENT BETWEEN THE CITY OF VERNON AND GEOSCIENCE SUPPORT SERVICES, INC. FOR ON-CALL PROFESSIONAL HYDROGEOLOGICAL
SERVICES
COVER PAGE
Contractor: Geoscience Support Services, Inc.
Responsible Principal of Contractor: Brian Villalobos, PG, CHG, CEG, Client Manager and Principal Geohydrologist
Notice Information - Contractor: Geoscience Support Services, Inc. 160 Via Verde, Ste. 150
San Dimas, CA 91773
Mailing Address:
P.O. Box 220
Claremont, CA 91711
Attention: Brian Villalobos, PG, CHG,
CEG, Client Manager and Principal
Geohydrologist
Telephone: (909) 286-2214
Notice Information - City: City of Vernon
4305 Santa Fe Avenue
Vernon, CA 90058
Attention: Todd Dusenberry,
General Manager
Telephone: (323) 583-8811 ext. 579
Commencement Date: August 5, 2025
Termination Date: August 4, 2028
Consideration: Total not to exceed $200,000 (includes
all applicable sales tax); and more
particularly described in Exhibit B
Records Retention Period Three (3) years, pursuant to Section
11.20 Geoscience Support Services, Inc.
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SERVICES AGREEMENT BETWEEN THE CITY OF VERNON AND GEOSCIENCE SUPPORT SERVICES, INC. FOR ON-CALL PROFESSIONAL HYDROGEOLOGICAL
SERVICES
This Agreement is made between the City of Vernon, a California charter City and California municipal corporation (“City”), and Geoscience Support Services, Inc., a California corporation (“Contractor”).
The City and Contractor agree as follows:
1.0 EMPLOYMENT OF CONTRACTOR. City agrees to engage Contractor to perform the services as hereinafter set forth as authorized by the City Council on August 5, 2025.
2.0 SCOPE OF SERVICES.
2.1 Contractor shall perform all work necessary to complete the services set forth in the City’s Request for Proposals issued on or about May 22, 2025, and titled RFP for On-Call Professional Hydrogeological Services, and Contractor's proposal to the City ("Proposal") dated June 12, 2025, Exhibit “A”, a copy which is attached to and incorporated into this Agreement by reference.
2.2 All services shall be performed to the satisfaction of City.
2.3 All services shall be performed in a competent, professional, and satisfactory manner in accordance with the prevailing industry standards for such services.
3.0 PERSONNEL.
3.1 Contractor represents that it employs, or will employ, at its own expense, all personnel required to perform the services under this Agreement.
3.2 Contractor shall not subcontract any services to be performed by it under this Agreement without prior written approval of City.
3.3 All of the services required hereunder will be performed by Contractor or by City approved subcontractors. Contractor, and all personnel engaged in the work, shall be fully qualified and authorized or permitted under State and local law to perform such services and shall be subject to approval by the City.
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4.0 TERM. The term of this Agreement shall commence on August 5, 2025, and it shall continue until August 4, 2028, unless terminated at an earlier date pursuant to the provisions thereof.
5.0 COMPENSATION AND FEES.
5.1 Contractor has established rates for the City of Vernon which are comparable to and do not exceed the best rates offered to other governmental entities in and around Los Angeles County for the same services. For satisfactory and timely performance of the services, the City will pay Contractor in accordance with the payment schedule set forth in Exhibit “B” attached hereto and incorporated herein by reference.
5.2 Contractor's grand total compensation for the entire term of this Agreement, shall not exceed $200,000 without the prior authorization of the City, as appropriate, and written amendment of this Agreement.
5.3 Contractor shall, at its sole cost and expense, furnish all necessary and incidental labor, material, supplies, facilities, equipment, and transportation which may be required for furnishing services pursuant to this Agreement. Materials shall be of the highest quality. The above Agreement fee shall include all staff time and all clerical, administrative, overhead, insurance, reproduction, telephone, air travel, auto rental, subsistence, and all related costs and expenses.
5.4 City shall reimburse Contractor only for those costs or expenses specifically approved in this Agreement, or specifically approved in writing in advance by City. Unless otherwise approved, such costs shall be limited and include nothing more than the following costs incurred by Contractor:
5.4.1 The actual costs of subcontractors for performance of any of the services that Contractor agrees to render pursuant to this Agreement, which have been approved in advance by City and awarded in accordance with this Agreement.
5.4.2 Approved reproduction charges.
5.4.3 Actual costs and/or other costs and/or payments specifically authorized in advance in writing and incurred by Contractor in the performance of this Agreement.
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5.5 Contractor shall not receive any compensation for extra work performed without the prior written authorization of City. As used herein, “extra work” means any work that is determined by City to be necessary for the proper completion of the Project, but which is not included within the Scope of Services and which the parties did not reasonably anticipate would be necessary at the time of execution of this Agreement. Compensation for any authorized extra work shall be paid in accordance with the payment schedule as set forth in Exhibit “B,” if the extra work has been approved by the City.
5.6 Licenses, Permits, Fees, and Assessments. Contractor shall obtain, at Contractor’s sole cost and expense, such licenses, permits, and approvals as may be required by law for the performance of the services required by this Agreement.
Contractor shall have the sole obligation to pay for any fees, assessments, and taxes, plus applicable penalties and interest, which may be imposed by law and which arise from or are necessary for the performance of the Services by this Agreement.
6.0 PAYMENT.
6.1 As scheduled services are completed, Contractor shall submit to the City an invoice for the services completed, authorized expenses, and authorized extra work actually performed or incurred according to said schedule.
6.2 Each such invoice shall state the basis for the amount invoiced, including a detailed description of the services completed, the number of hours spent, reimbursable expenses incurred and any extra work performed.
6.3 Contractor shall also submit a progress report with each invoice that describes in reasonable detail the services and the extra work, if any, performed in the immediately preceding calendar month.
6.4 Contractor understands and agrees that invoices which lack sufficient detail to measure performance will be returned and not processed for payment.
6.5 City will pay Contractor the amount invoiced within thirty (30) days after the City approves the invoice.
6.6 Payment of such invoices shall be payment in full for all services, Geoscience Support Services, Inc.
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authorized costs, and authorized extra work covered by that invoice.
7.0 CITY'S RESPONSIBILITY. City shall cooperate with Contractor as may be reasonably necessary for Contractor to perform its services; and will give any required decisions as promptly as practicable so as to avoid unreasonable delay in the progress of Contractor's services.
8.0 COORDINATION OF SERVICES. Contractor agrees to work closely with City staff in the performance of Services and shall be available to City’s staff, consultants, and other staff at all reasonable times.
9.0 INDEMNITY. Contractor agrees to indemnify City, its officers, elected officials, employees and agents against, and will hold and save each of them harmless from, any and all actions, suits, claims, damages to persons or property, losses, costs, penalties, obligations, errors, omissions or liabilities (herein “claims or liabilities”), including but not limited to professional negligence, that may be asserted or claimed by any person, firm or entity arising out of or in connection with the work, operations or activities of Contractor, its agents, employees, subcontractors, or invitees, provided for herein, or arising from the acts or omissions of Contractor hereunder, or arising from Contractor’s performance of or failure to perform any term, provision, covenant or condition of this Agreement, except to the extent such claims or liabilities arise from the gross negligence or willful misconduct of City, its officers, elected officials, agents or employees.
10.0 INSURANCE. Contractor shall procure and maintain for the duration of the Agreement insurance against claims for injuries to persons or damage to property that may arise from or in connection with the performance of the work hereunder by the Contractor, its agents, representative, or employees. The policies shall state that they afford primary coverage.
10.1 Automobile Liability Insurance – Primary insurance coverage shall be written on ISO Business Auto coverage form for all owned, hired, and non-owned automobiles or any auto. The policy shall have a combined single limit of not less than one million dollars ($1,000,000). If Contractor is transporting one or more nonemployee passengers in the performance of the services, the automobile liability policy Geoscience Support Services, Inc.
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shall have a combined single limit of two million dollars ($2,000,000). If Contractor owns no autos, a hired, non-owned auto endorsement to the General Liability policy is acceptable.
10.1.1 Contractor agrees to subrogate automobile liability resulting from performance under this agreement by agreeing to defend, indemnify, and hold harmless, the City, and its respective employees, agents, and City Council from and against all claims, liabilities, suits, losses, damages, injuries and expenses, including all costs and reasonable attorney’s fees (“Claims”), which are attributable to any act or omission by the Contractor under the performance of the services. The City of Vernon, its directors, commissioners, officers, employees, agents, and volunteers must be endorsed on the policy as additional insureds and, under the Contractors’ policy, there shall be a waiver of subrogation, and the policy shall be primary and non-contributory and will not seek contribution from the City’s insurance.
10.2 Commercial General Liability Insurance – Contractor shall carry General Liability Insurance covering all operations performed by or on behalf of the Contractor providing coverage for bodily injury and property damage with a single limit of not less than one million dollars ($1,000,000) per occurrence and two million dollars ($2,000,000) general aggregate limit written on an Insurance Services Office (ISO) Comprehensive General Liability "occurrence" Form CG 00 01 or its equivalent for coverage on an occurrence basis. The City of Vernon, its directors, commissioners, officers, employees, agents, and volunteers must be endorsed on the policy as additional insureds with respect to liability arising out of the Contractor's performance of this Agreement. The additional insured coverage under the Contractor’s policy shall be primary and non-contributory and will not seek contribution from the City’s insurance.
The policy shall be endorsed to include a waiver of subrogation.
10.2.1 If Contractor intends to employ other contractors as part of the services rendered, the City must approve and will establish the Geoscience Support Services, Inc.
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appropriate insurance requirements.
10.2.2 Contractor agrees to subrogate General Liability resulting from performance under this agreement by agreeing to defend, indemnify, and hold harmless, the City, and its respective employees, agents, and City Council from and against all claims, liabilities, suits, losses, damages, injuries and expenses, including all costs and reasonable attorney’s fees (“Claims”), which are attributable to any act or omission by the Contractor under the performance of the services.
10.3 Professional Errors and Omissions Coverage in a sum of not less than one million dollars ($1,000,000), where such risk is applicable. Applicable aggregate must be identified and claims history provided to determine amounts remaining under the aggregates. Contractor shall maintain such coverage for at least one (1) year after the termination of this agreement.
10.4 Umbrella Liability Insurance – An umbrella (over primary) may be used to comply with limits or other primary coverage requirements. When used, the umbrella policy shall apply to bodily injury/property damage and personal injury/advertising injury and shall include a “dropdown” provision providing primary coverage for any liability not covered by the primary policy. The umbrella policy shall have no additional exclusion or coverage difference from the primary policy. The coverage shall also apply to automobile liability.
10.5 Workers’ Compensation/Employers Liability - Contractor shall comply with the applicable sections of the California Labor Code concerning workers' compensation for injuries on the job. Compliance is accomplished in one of the following manners:
10.5.1 Provide a copy of the permissive self-insurance certificate approved by the State of California; or
10.5.2 Secure and maintain in force a policy of workers' compensation insurance with statutory limits and Employer's Liability Insurance with a limit of one million dollars ($1,000,000) per accident. The policy shall be endorsed to waive all rights of subrogation against Geoscience Support Services, Inc.
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City, its directors, commissioners, officers, employees, and volunteers for losses arising from performance of this Agreement or
10.5.3 If Contractor has no employees, it may certify or warrant to the City that it does not currently have any employees or individuals who are defined as “employees” under the Labor Code, and the requirement for Workers’ Compensation coverage will be waived by completing the waiver form provided by the City.
10.6 If Contractor maintains broader coverage and/or higher limits than the minimums shown above, City requires and shall be entitled to the broader coverage and/or the higher limits maintained by the Contractor. Any available insurance proceeds in excess of the specified minimum limits of insurance and coverage shall be available to the City.
10.7 Each insurance policy included in this clause shall be endorsed to state that coverage shall not be cancelled except after thirty (30) days prior written notice to City.
10.8 Insurance shall be placed with insurers with an A.M. Best rating of no less than A-VIII. Any self-insured retention or deductible in excess of $25,000 must be approved in advance by the City. Any policies written on a claims-based basis must include a minimum of a 3-year tail.
10.9 Prior to the commencement of performance, Contractor shall furnish City with a certificate of insurance for each policy. Each certificate is to be signed by a person authorized by that insurer to evidence coverage on its behalf. The certificate(s) must be in a form approved by City. City may require complete, certified copies of any or all policies upon request.
10.10 Failure to maintain required insurance at all times shall constitute a default and material breach. In such event, Contractor shall immediately notify City and cease all performance under this Agreement until further directed by the City. In the absence of satisfactory insurance coverage, City may, at its option: (a) procure insurance with collection rights for premiums, attorney's fees, and costs against Contractor by way of set-off or recoupment from sums due to Contractor, at City's option; (b) immediately Geoscience Support Services, Inc.
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terminate this Agreement and seek damages from the Agreement resulting from said breach; or (c) self-insure the risk, with all damages and costs incurred, by judgment, settlement or otherwise, including attorney's fees and costs, being collectible from Contractor, by way of set-off or recoupment from any sums due to Contractor.
11.0 GENERAL TERMS AND CONDITIONS.
11.1 INDEPENDENT CONTRACTOR.
11.1.1 It is understood that in the performance of the services herein provided for, Contractor shall be, and is, an independent contractor, and is not an agent, officer or employee of City and shall furnish such services in its own manner and method except as required by this Agreement, or any applicable statute, rule, or regulation. Further, Contractor has and shall retain the right to exercise full control over the employment, direction, compensation and discharge of all persons employed by Contractor in the performance of the services hereunder. City assumes no liability for Contractor’s actions and performance, nor assumes responsibility for taxes, bonds, payments, or other commitments, implied or explicit, by or for Contractor. Contractor shall be solely responsible for, and shall indemnify, defend and save City harmless from all matters relating to the payment of its employees, subcontractors and independent contractors, including compliance with social security, withholding and all other wages, salaries, benefits, taxes, exactions, and regulations of any nature whatsoever.
11.1.2 Contractor acknowledges that Contractor and any
subcontractors, agents or employees employed by Contractor shall not, under any circumstances, be considered employees of the City, and that they shall not be entitled to any of the benefits or rights afforded employees of City, including, but not limited to, sick leave, vacation leave, holiday pay, Public Employees Retirement System benefits, or health, life, dental, long-term disability or workers' compensation insurance benefits.
11.2 CONTRACTOR NOT AGENT. Except as the City may authorize in writing, Contractor and its subcontractors shall have no authority, express or implied, to act on behalf of or bind the City in any capacity whatsoever as agents or otherwise.
11.3 OWNERSHIP OF WORK. All documents and materials furnished by the City to Contractor shall remain the property of the City and shall be returned to Geoscience Support Services, Inc.
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the City upon termination of this Agreement. All reports, drawings, plans, specifications, computer tapes, floppy disks and printouts, studies, memoranda, computation sheets, and other documents prepared by Contractor in furtherance of the work shall be the sole property of City and shall be delivered to City whenever requested at no additional cost to the City. Contractor shall keep such documents and materials on file and available for audit by the City for at least three (3) years after completion or earlier termination of this Agreement. Contractor may make duplicate copies of such materials and documents for its own files or for such other purposes as may be authorized in writing by the City.
11.4 CORRECTION OF WORK. Contractor shall promptly correct any defective, inaccurate or incomplete tasks, deliverables, goods, services and other work, without additional cost to the City. The performance or acceptance of services furnished by Contractor shall not relieve the Contractor from the obligation to correct subsequently discovered defects, inaccuracy, or incompleteness.
11.5 RESPONSIBILITY FOR ERRORS. Contractor shall be responsible for its work and results under this Agreement. Contractor, when requested, shall furnish clarification and/or explanation as may be required by the City, regarding any services rendered under this Agreement at no additional cost to City. In the event that an error or omission attributable to Contractor occurs, then Contractor shall, at no cost to City, provide all necessary design drawings, estimates and other Contractor professional services necessary to rectify and correct the matter to the sole satisfaction of City and to participate in any meeting required with regard to the correction.
11.6 WAIVER. The City's waiver of any term, condition, breach, or default of this Agreement shall not be considered to be a waiver of any other term, condition, default or breach, nor of a subsequent breach of the one waived. The delay or failure of either party at any time to require performance or compliance by the other of any of its obligations or agreements shall in no way be deemed a waiver of those rights to require such performance or compliance. No waiver of any provision of this Agreement shall be effective unless in writing and executed by a duly authorized representative of the party against whom enforcement of a waiver is sought.
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11.7 SUCCESSORS. This Agreement shall inure to the benefit of, and shall be binding upon, the parties hereto and their respective heirs, successors, and/or assigns.
11.8 NO ASSIGNMENT. Contractor shall not assign or transfer this Agreement or any rights hereunder without the prior written consent of the City and approval by the City Attorney, which may be withheld in the City's sole discretion. Any unauthorized assignment or transfer shall be null and void and shall constitute a material breach by the Contractor of its obligations under this Agreement. No assignment shall release the original parties from their obligations or otherwise constitute a novation.
11.9 COMPLIANCE WITH LAWS. Contractor shall comply with all Federal, State, County and City laws, ordinances, rules and regulations, which are, as amended from time to time, incorporated herein and applicable to the performance hereof. Violation of any law material to performance of this Agreement shall entitle the City to terminate the Agreement and otherwise pursue its remedies. Further, if the Contractor performs any work knowing it to be contrary to such laws, rules, and regulations Contractor shall be solely responsible for all costs arising therefrom.
11.10 ATTORNEY'S FEES. If any action at law or in equity is brought to enforce or interpret the terms of this Agreement, the prevailing party shall be entitled to reasonable attorney's fees, costs, and necessary disbursements in addition to any other relief to which such party may be entitled.
11.11 INTERPRETATION.
11.11.1 Applicable Law. This Agreement shall be deemed an agreement and shall be governed by and construed in accordance with the laws of the State of California. Contractor agrees that the State and Federal courts which sit in the State of California shall have exclusive jurisdiction over all controversies and disputes arising hereunder, and submits to the jurisdiction thereof.
11.11.2 Entire Agreement. This Agreement, including any exhibits attached hereto, constitutes the entire agreement and understanding between the parties regarding its subject matter and supersedes all prior or contemporaneous Geoscience Support Services, Inc.
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negotiations, representations, understandings, correspondence, documentation, and agreements (written or oral).
11.11.3 Written Amendment. This Agreement may only be
changed by written amendment executed by Contractor and the City Administrator or other authorized representative of the City, subject to any requisite authorization by the City Council. Any oral representations or modifications concerning this Agreement shall be of no force or effect.
11.11.4 Severability. If any provision in this Agreement is held by any court of competent jurisdiction to be invalid, illegal, void, or unenforceable, such portion shall be deemed severed from this Agreement, and the remaining provisions shall nevertheless continue in full force and effect as fully as though such invalid, illegal, or unenforceable portion had never been part of this Agreement.
11.11.5 Order of Precedence. In case of conflict between the terms of this Agreement and the terms contained in any document attached as an Exhibit or otherwise incorporated by reference, the terms of this Agreement shall strictly prevail. The terms of the City’s Request for Proposals shall control over the Contractor’s Proposal.
11.11.6 Construction. In the event an ambiguity or question of intent or interpretation arises with respect to this Agreement, this Agreement shall be construed as if drafted jointly by the parties and in accordance with its fair meaning.
There shall be no presumption or burden of proof favoring or disfavoring any party by virtue of the authorship of any of the provisions of this Agreement.
11.12 TIME OF ESSENCE. Time is strictly of the essence of this agreement and each and every covenant, term, and provision hereof.
11.13 AUTHORITY OF CONTRACTOR. The Contractor hereby
represents and warrants to the City that the Contractor has the right, power, legal capacity, and authority to enter into and perform its obligations under this Agreement, and its execution of this Agreement has been duly authorized.
11.14 ARBITRATION OF DISPUTES. Any dispute for under $25,000 arising out of or relating to the negotiation, construction, performance, non-performance, Geoscience Support Services, Inc.
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breach, or any other aspect of this Agreement, shall be settled by binding arbitration in accordance with the Commercial Rules of the American Arbitration Association at Los Angeles, California and judgment upon the award rendered by the Arbitrators may be entered in any court having jurisdiction thereof. The City does not waive its right to object to the timeliness or sufficiency of any claim filed or required to be filed against the City and reserves the right to conduct full discovery.
11.15 NOTICES. Any notice or demand to be given by one party to the other must be given in writing and by personal delivery or prepaid first-class, registered or certified mail, addressed as follows. Notice simply to the City of Vernon or any other City department is not adequate notice.
If to the City:
City of Vernon
Attention: Todd Dusenberry, General Manager
4305 Santa Fe Avenue
Vernon, CA 90058
If to the Contractor:
Geoscience Support Services, Inc.
Attention: Brian Villalobos, PG, CHG, CEG, Client Manager and Principal Geohydrologist
160 Via Verde, Ste. 150
San Dimas, CA 91773
Mailing Address:
P.O. Box 220
Claremont, CA 91711
Any such notice shall be deemed to have been given upon delivery, if personally delivered, or, if mailed, upon receipt, or upon expiration of three (3) business days from the date of posting, whichever is earlier. Either party may change the address at which it desires to receive notice upon giving written notice of such request to the other party.
11.16 NO THIRD PARTY RIGHTS. This Agreement is entered into for the sole benefit of City and Contractor and no other parties are intended to be direct or Geoscience Support Services, Inc.
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incidental beneficiaries of this Agreement and no third party shall have any right or remedy in, under, or to this Agreement.
11.17 TERMINATION FOR CONVENIENCE (Without Cause). City may terminate this Agreement in whole or in part at any time, for any cause or without cause, upon fifteen (15) calendar days' written notice to Contractor. If the Agreement is thus terminated by City for reasons other than Contractor's failure to perform its obligations, City shall pay Contractor a prorated amount based on the services satisfactorily completed and accepted prior to the effective date of termination. Such payment shall be Contractor's exclusive remedy for termination without cause.
11.18 DEFAULT. In the event either party materially defaults in its obligations hereunder, the other party may declare a default and terminate this Agreement by written notice to the defaulting party. The notice shall specify the basis for the default. The Agreement shall terminate unless such default is cured before the effective date of termination stated in such notice, which date shall be no sooner than ten (10) days after the date of the notice. In case of default by Contractor, the City reserves the right to procure the goods or services from other sources and to hold the Contractor responsible for any excess costs occasioned to the City thereby. Contractor shall not be held accountable for additional costs incurred due to delay or default as a result of Force Majeure. Contractor must notify the City immediately upon knowing that non-performance or delay will apply to this Agreement as a result of Force Majeure. At that time Contractor is to submit in writing a Recovery Plan for this Agreement. If the Recovery Plan is not acceptable to the City or not received within 10 days of the necessary notification of Force Majeure default, then the City may cancel this order in its entirety at no cost to the City, owing only for goods and services completed to that point.
11.19 TERMINATION FOR CAUSE. Termination for cause shall relieve the terminating party of further liability or responsibility under this Agreement, including the payment of money, except for payment for services satisfactorily and timely performed prior to the service of the notice of termination, and except for reimbursement of (1) any payments made by the City for service not subsequently performed in a timely Geoscience Support Services, Inc.
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and satisfactory manner, and (2) costs incurred by the City in obtaining substitute performance. If this Agreement is terminated as provided herein, City may require, at no additional cost to City, that Contractor provide all finished or unfinished documents, data, and other information of any kind prepared by Contractor in connection with the performance of Services under this Agreement. Contractor shall be required to provide such document and other information within fifteen (15) days of the request.
11.19.1 Additional Services. In the event this Agreement is terminated in whole or in part as provided herein, City may procure, upon such terms and in such manner as it may determine appropriate, services similar to those terminated.
11.20 MAINTENANCE AND INSPECTION OF RECORDS.
The City, or its authorized auditors or representatives, shall have access to and the right to audit and reproduce any of the Contractor's records to the extent the City deems necessary to insure it is receiving all money to which it is entitled under the Agreement and/or is paying only the amounts to which Contractor is properly entitled under the Agreement or for other purposes relating to the Agreement.
The Contractor shall maintain and preserve all such records for a period of at least three (3) years after termination of the Agreement.
The Contractor shall maintain all such records in the City of Vernon.
If not, the Contractor shall, upon request, promptly deliver the records to the City of Vernon or reimburse the City for all reasonable and extra costs incurred in conducting the audit at a location other than the City of Vernon, including, but not limited to, such additional (out of the City) expenses for personnel, salaries, private auditors, travel, lodging, meals, and overhead.
11.21 CONFLICT. Contractor hereby represents, warrants, and certifies that no member, officer, or employee of the Contractor is a director, officer, or employee of the City of Vernon, or a member of any of its boards, commissions, or committees, except to the extent permitted by law.
11.22 HEADINGS. Paragraphs and subparagraph headings contained in this Agreement are included solely for convenience and are not intended to modify, Geoscience Support Services, Inc.
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explain or to be a full or accurate description of the content thereof and shall not in any way affect the meaning or interpretation of this Agreement.
11.23 ENFORCEMENT OF WAGE AND HOUR LAWS. Eight hours labor constitutes a legal day's work. The Contractor, or subcontractor, if any, shall forfeit twenty-five dollars ($25) for each worker employed in the execution of this Agreement by the respective Contractor or subcontractor for each calendar day during which the worker is required or permitted to work more than 8 hours in any one calendar day and 40 hours in any one calendar week in violation of the provisions of Sections 1810 through 1815 of the California Labor Code as a penalty paid to the City; provided, however, work performed by employees of contractors in excess of 8 hours per day, and 40 hours during any one week, shall be permitted upon compensation for all hours worked in excess of 8 hours per day at not less than 1½ times the basic rate of pay.
11.24 PREVAILING WAGES. The provisions of California Labor Code 1770, et seq., regarding the payment of prevailing wages on public works, and related regulations, apply to all City agreements. In addition, the selected consultant and/or any subcontractor must be currently registered and qualified (including payment of any required fee) with the State Department of Industrial Relations pursuant to Labor Code section 1725.5. This project is subject to compliance monitoring and enforcement by the State Department of Industrial Relations.
11.25 EQUAL EMPLOYMENT OPPORTUNITY PRACTICES. Contractor certifies and represents that, during the performance of this Agreement, it and any other parties with whom it may subcontract shall adhere to equal employment opportunity practices to assure that applicants, employees and recipients of service are treated equally and are not discriminated against because of their race, religion, color, national origin, ancestry, disability, sex, age, medical condition, sexual orientation or marital status. Contractor further certifies that it will not maintain any segregated facilities.
Contractor further agrees to comply with The Equal Employment Opportunity Practices provisions as set forth in Exhibit “C”.
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IN WITNESS WHEREOF, the Parties have executed this Agreement as of the Commencement Date stated on the cover page.
City of Vernon, a California charter City
and California municipal corporation
By: ____________________________
Brian Saeki, City Administrator
Geoscience Support Services, Inc., a
California corporation
By:
Name:
Title:
ATTEST:
_______________________________
Genoveva Rocha, City Clerk
By:
Name:
Title:
APPROVED AS TO FORM:
_______________________________
Zaynah N. Moussa,
City Attorney
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EXHIBIT A
CONTRACTOR'S PROPOSAL
gssiwater.com
main office
160 Via Verde, Suite 150, San Dimas, CA 91773
909.451.6650 | phone
June 12, 2025
Presented to:
City of Vernon
Statement of Qualifications
ON-CALL PROFESSIONAL
HYDROGEOLOGICAL SERVICES
gssiwater.com i
COVER LETTER.............................................................................................................................. i INTRODUCTION..........................................................................................................................1 GENERAL SCOPE OF WORK..............................................................................................2 WORK PLAN...................................................................................................................................8 FEES & COST..................................................................... IN A SEPARATE DOCUMENT ABILITY OF THE PROPOSER TO PERFORM......................................................12
APPENDICES
Appendix A: Detailed Resumes
Appendix B: Detailed Project Descriptions
Contents
P.O. Box 220
Claremont, CA 91711 ii
June 12, 2025
Ms. Rhonda Aho
Assistant Civil Engineer
City of Vernon, Dept. of Public Utilities
4305 Santa Fe Avenue
Vernon, CA 90058
RE: Geoscience Proposal to Provide As-Needed Hydrogeology Services to the City of Vernon Dear Ms. Aho,
Geoscience Support Services, Inc. (Geoscience) is pleased to submit our statement of qualifications to serve the City of Vernon (City) to provide as-needed hydrogeological consultant services for future City projects. For more than 45 years, our firm has had one mission: to help our clients sustainably manage their groundwater resources. The Geoscience team has completed numerous groundwater projects, including hydrogeological basin studies, groundwater monitoring programs, well design and construction, and well rehabilitation. We also have extensive expertise in groundwater modeling, and our team’s knowledge of Southern California basins and stakeholders can provide you with reliable and robust tools for your current and future efforts. Each member of the Geoscience team brings several years of relevant experience - not only to supply quality on-going technical data and deliverables, but to also collaboratively solve future technical challenges alongside the City.
With a complex hydrogeologic environment, the City requires experts in several fields to provide comprehensive services and capabilities. Geoscience is that team - capable and ready to assist the City in meeting your immediate needs, as well addressing technical needs as they evolve. In addition, we have added PACE as an engineering subconsultant to supplement our services for the Well No. 23 PDR. Below is a brief summary of our team as presented herein and how their experience will meet or exceed your expectations.
More than four decades of Groundwater Expertise
Our team has completed numerous groundwater projects in the region, including hydrogeological basin studies, sustainable yield studies, water supply well design and construction, and well condition assessments and rehabilitation. We can also leverage our depth of expertise in groundwater modeling, and our team’s knowledge of Southern California basins and stakeholders to provide you with reliable and robust tools for your current and future efforts, if needed. Our knowledge of the local area and the watershed, our track record of successfully providing identical services, and our focus on long-term cost savings will help you reduce long term costs, while meeting your project goals.
A qualified and experienced team to provide comprehensive hydrogeological services Geoscience is a firm focused solely on groundwater consulting, specializing in modeling, studies and investigations, and production well design and rehabilitation. We have a long history working with water agencies, municipalities, and districts in Southern California - having completed more than 2,050 groundwater studies and projects, as well as more than 100 modeling projects and more than 1,050 production and supply well projects since our founding. Our assigned project team members are the best in their field and have more than 120 years of combined experience dealing with all types of hydrogeological issues. The extensive experience of our project managers and team will provide you with cost-effective and knowledgable assistance to help you meet your water supply goals and needs.
Using proven project approaches will help deliver successful projects Our team members have provided each of the requested services listed in the RFQ to many of our current clients and will continue using the same approaches that have successfully delivered numerous hydrogeological studies, groundwater modeling, groundwater sustainability plans, and well design and development projects. Because we have successfully completed more than 3,000 groundwater studies, modeling projects, and production and supply well projects, we can consider more possibilities and provide more certainty on a successful project outcome.
P.O. Box 220
Claremont, CA 91711 iii
For your convenience, we have provided firm details for Geoscience Support Services, Inc. in the table below.
Geoscience Support Services, Inc.
Main (Corp.) Address: 160 Via Verde, Ste. 150, San Dimas, CA 91773 Mailing Address: P.O. Box 220, Claremont, CA 91711
Phone: (909) 451-6650 Fax: (909) 451-6638
Website Address: www.gssiwater.com
Contact: Brian Villalobos, PG, CHG, CEG, Project Manager P: 909.286.2214 | F: 909.451.6638
E: [email protected]
We are committed to forging a lasting and trusting relationship with the City of Vernon. The extensive experience we have acquired during our history of working with other California municipalities and water districts allows us to provide the hydrogeological and technical capabilities that you require. If you have any questions regarding our submittal or need any additional information, please contact me, our Project Manager at (909) 451-6650 or via email at [email protected].
Regards,
Brian Villalobos, PG, CHG, CEG Logan Wicks, PG
Client Manager and Principal Geohydrologist Deputy Client Manager and Sr. Geohydrologist March 2013
AFFIDAVIT OF NON-COLLUSION BY CONTRACTOR
STATE OF CALIFORNIA )
) ss
COUNTY OF LOS ANGELES )
_______________________________________________________________, being first duly sworn deposes and says that he/she is ______________________________________________________________________ (Insert "Sole Owner", "Partner", "President, "Secretary", or other proper title) of______________________________________________________________________________________ (Insert name of bidder)
who submits herewith to the City of Vernon a bid/proposal; That all statements of fact in such bid/proposal are true; That such bid/proposal was not made in the interest of or on behalf of any undisclosed person, partnership, company, association, organization or corporation; That such bid/proposal is genuine and not collusive or sham; That said bidder has not, directly or indirectly by agreement, communication or conference with anyone attempted to induce action prejudicial to the interest of the City of Vernon, or of any other bidder or anyone else interested in the proposed contract; and further That prior to the public opening and reading of bids/proposals, said bidder:
a. Did not directly or indirectly, induce or solicit anyone else to submit a false or sham bid/proposal;
b. Did not directly or indirectly, collude, conspire, connive or agree with anyone else that said bidder or anyone else would submit a false or sham bid/proposal, or that anyone should refrain from bidding or withdraw his/her bid/proposal;
c. Did not, in any manner, directly or indirectly seek by agreement, communication or conference with anyone to raise or fix the bid/proposal price of said bidder or of anyone else, or to raise or fix any overhead, profit or cost element of his/her bid/proposal price, or of that of anyone else; d. Did not, directly or indirectly, submit his/her bid/proposal price or any breakdown thereof, or the contents thereof, or divulge information or data relative thereto, to any corporation, partnership, company, association, organization, bid depository, or to any member or agent thereof, or to any individual or group of individuals, except the City of Vernon, or to any person or persons who have a partnership or other financial interest with said bidder in his/her business.
I certify under penalty of perjury that the above information is correct By:__________________________________
Date:____________________________________
Mr. Brian Villalobos
a Principal Geohydrologist
Geoscience Support Services, Inc.
Brian Villalobos Principal Geohydrologist
06/12/2025
gssiwater.com 1
organize tasks, manage level of effort, develop
and monitor critical-path schedules, and
compare actual costs to planned costs at key
milestones. By using these organizational
techniques, effectively communicating, and
coordinating with City staff, we can help
ensure that your projects are delivered ontime and on-schedule.
Prior to the start of any project, Geoscience
recommends holding a kick-off meeting with
the project team. The primary objective
of the project kick-off meeting is to meet
face-to-face with key project individuals
to verify that everyone understands the
intent, objectives, tasks, budgets, schedules,
milestones, and deliverables. The kick-off
meeting also identifies the individuals who are
responsible for implementing each part of the
work. The meeting also provides a forum to
discuss critical path tasks and how they can be
expedited.
Geoscience will provide project management
services throughout the entire project to
confirm that all aspects are carried out
in a proper and efficient manner. Project
management activities will include (but not
necessarily be limited to) coordination and
correspondence with client personnel, project
schedule and status updates, project budget
monitoring, and quality control and assurance.
This task will also include availability to assist
with any unforeseen issues which may arise
throughout the course of the project. All
Documents produced and submitted to our
clients will be stamped and signed by the State
of California Certified Hydrogeologist verifying
that proper QA/QC protocols have been
followed. All comments by client personnel
shall be addressed in writing by either a client
provided, or Geoscience developed comment
review sheet. All drawings shall be signed by
the appropriately licensed project manager in
a client approved title block.
PROJECT UNDERSTANDING
The City of Vernon (City) is an industrial city
southeast of Downtown Los Angeles that
offers a range of municipal services that
includes water and sewer utility operations.
The City has six (6) active groundwater wells,
with four inactive wells, 14 booster pumps,
and three reservoirs to provide potable
water to its customers. Over the past several
years the City has embarked on ambitious
plans to upgrade and expand their system.
As such, the City is seeking the services of
qualified hydrogeological consultants, to
provide hydrogeological services that include
groundwater modeling, hydrogeologic
studies and the preparation of design plans,
specifications, and cost estimates for the City
for future capital improvement projects. These
projects can include water well rehabilitation,
water well condition assessments, water
well siting and feasibility studies, drinking
water source assessment and protection
(DWSAP) plans, and new water well drilling.
We understand that some future projects may
require coordination with other government
agencies including neighboring cities, the
County of Los Angeles, Caltrans, etc. , as
well as compliance with the requirements of
the grant funding programs and the agency
providing the source of funds.
PROJECT RESPONSIVENESS &
QA/QC
Effectively controlling the scope, schedule, and
budget are critical to achieve a quality project.
Our Project Team knows that understanding
and managing the interrelationship of these
three elements largely determines the
project’s success with respect to budget.
Scope creep increases cost and produces
delay. Delays increase costs and cause
critical milestones to be missed. Geoscience
understands these issues and can successfully
Geoscience is a leading groundwater consulting firm, working with water districts, municipalities, government agencies, and private industries to overcome the most complex challenges in developing, managing, and preserving groundwater resources.
Introduction
gssiwater.com 2
General Scope of Work
GENERAL PROJECT APPROACH
To successfully accomplish any future
hydrogeological-based project, Geoscience
has assembled a team of highly qualified
professionals who have extensive experience
in groundwater modeling, hydrogeologic
studies and the design, construction, and
rehabilitation of water supply wells. How
challenges are handled during each process
makes the difference between completed
projects that meet client expectations
versus projects that have unrealized issues.
Our general approach to our hydrogeologic
projects is as follows.
1 First, we understand that effective day-today communications between the project team, including our project manager, client
staff, and if needed, selected subconsultants
and/or contractors will be critical.
2 Second, we carefully consider the requirements of each project and assemble a team of professional geohydrologists with
applicable experience. We leverage this
experience among our professional staff to
make sure that each project is successful.
We accomplish this by using our in-house
Technical Advisory Team, which is an internal
collaborative effort among Geoscience’s
professional staff - from our Principals to
our project managers - so that all of our
company experience is brought to bear when
tackling any issues that can arise during any
project. This Technical Advisory Team acts
as QA/QC for all aspects of each project.
During the construction phase of a project,
Geoscience has an extensive resource of five
(5) experienced and highly qualified field
geohydrologists. This resource can confirm
continuous and uninterrupted management
of a project and allows us to easily meet client
schedule requirements and field supervision
during Drilling Contractor activities.
3 Third, our team maintains close, professional working relationships with the major drilling contractors in the region.
The mutual respect and professional working
relationships that we have built with drilling
contractors over the last several decades
allows us to work through small unforeseen
issues before they turn into big problems and
allows us to solve sudden problems in a way
that provides the least impact to the budget
and schedule, resulting in the overall best
outcome for our clients.
4 Fourth, we understand that water quality in the Central Basin is highly spatially variable. Review of water quality from nearby
wells, show that water quality from the
existing wells is generally good, but that some
wells in the surrounding area have reports
of water quality constituents near or above
DDW MCLs. These constituents include VOCs,
metals, and PFAS constituents.
Because of this, we use isolated aquifer zone
testing that plays a critical role in any final
well design. Not only does this testing provide
insight into overall groundwater production
potential ahead of construction, it also allows
for the opportunity to avoid unfavorable
water quality zones, should they be present
at this location. Isolated aquifer zone testing
is a methodology that Geoscience developed
with drilling contractors more than 20 years
ago and has become an industry standard
procedure for well design. However, how
this testing is performed and how data is
collected can mean the difference between
a well that produces high volumes of good
quality water and one that does not. Over the
years, Geoscience has refined this process
to yield the best quality results. Our modern
Casing Installation Observation
gssiwater.com 3
techniques leverage technologies to provide
the most reliable data collect that is also
available remotely. Discharge rates measured
with highly sensitive magnetic flow meters,
and water level and water quality skids that
measure field parameters utilize remote
telemetry systems to transmit data in real
time to computers, tablets, and phones. This
sophistication ensures the highest quality
possible data is utilized for the final well
design.
5 Finally, our team has extensive experience working with local regulatory agencies, including the primary Districts of the
California State Water Resources Control
Board Division of Drinking Water (DDW) that
cover Los Angeles County, and the Los Angeles
County Department of Public Health. We
know that early and careful coordination with
DDW and the County is critical to ensuring
that all design criteria are considered in the
preliminary phases of the work so that they
are incorporated into the final design. Careful
coordination is essential to maintaining the
project schedule and making sure project
milestones are met.
Geoscience is committed to delivering quality
projects on time and within budget. We
approach every project with tried-and-true
scientific principles, while keeping in mind
knowledge gained from more than 47 years
of experience in the field of well design and
installation, well rehabilitation and condition
assessments, and hydrogeological studies.
GENERAL SCOPE OF WORK
Hydrogeological Modeling
Hydrogeologic Conceptual Model Refinement
Development of a lithologic model of the
groundwater basin that incorporates all
lithologic information from existing wells
can improve existing understanding and
incorporate information from recently drilled
wells into an existing conceptual model. The
lithologic model provides the basis from
which to parameterize the groundwater flow
model, incorporating well data to define the
lithology, and linking lithology to hydraulic
characteristics (hydraulic conductivity, specific
yield). Petrel® is utilized to develop state-ofthe-art lithologic models, view them in 3-D, and develop a sound hydrogeologic conceptual
model of the groundwater flow system with
the latest information from completed wells.
In tandem with the development of a
lithologic model, understanding inputs to
the groundwater flow system from the
land surface through the vadose zone
is important to quantifying safe yield.
Geoscience has developed and integrated
the watershed modeling software HSPF
(Hydrological Simulation Program - FORTRAN)
with MODFLOW to understand key land
surface processes (precipitation, runoff,
evapotranspiration, infiltration) and develop
water budgets for key inflow terms to the
groundwater model. A surface water model
also supports the understanding of surface
water/groundwater interaction.
Project Evaluation with an Integrated Suite of
Models
Geoscience has developed an industry-leading
An example of a lithologic model
Isolated Aquifer Zone Testing
gssiwater.com 4
approach to groundwater basin evaluation
and modeling. Evaluation of potential future
projects often requires an understanding
of the effects of the project on surface
water, groundwater and on surface water
and groundwater quality. Geoscience is
experienced in developing integrated models
to simulate management alternatives and
meet permitting requirements.
Well Siting: Geoscience has also developed
a novel approach for well siting that pulls
together GIS information and key information
from the groundwater flow model to identify
suitable parcels for recharge basin siting
and well siting. Information on parcels,
existing infrastructure, construction and
permitting constraints, groundwater levels,
and aquifer properties are developed into
a GIS database. From this database, a data
model is constructed to develop a quantitative
favorability metric to determine site
suitability. Each parcel is scored and ranked
based on factors determined through indepth consultation to determine the relative importance of various siting criteria. The
tool can then be refined based on manual
evaluation of favorable parcels. The tool
provides a data-based quantitative approach
that can be applied basin-wide to all parcels.
Conjunctive Use, ASR and IPR Modeling
An integrated modeling approach is necessary
to develop models that assess surface water,
groundwater and water quality. By developing
a calibrated integrated model, a full range of
management alternatives can be assessed,
including conjunctive use and recycled water
projects. Integrated models can quantify
surface water diversion and groundwater
recharge effects of conjunctive use projects.
Groundwater mounding and understanding
liquefaction risk is a critical limiting factor
for siting and assessing available recharge
capacity. Water quality models, including
MT3D-USGS, pair with MODFLOW to assess
water quality as a result of IPR projects.
Climate Change/Drought Scenario Analysis
Modeling
The Climate Change Technical Advisory
Committee (CCTAG) for SGMA has released
analyses of ensemble climate modeling
results to quantify anticipated future
increases and decreases in precipitation and
evapotranspiration. Geoscience has worked
with these results to develop climate change
scenarios for future hydrologic scenarios in
support of EIRs and GSPs.
Hydrogeological Planning Studies
Understanding the complexity of your
groundwater basin is an important first step
in developing or evaluating tools to help you
sustainably manage your basin. Geoscience
has extensive experience in the Central
Groundwater Basin, as well as adjacent
Santa Monica, West Coast, and San Gabriel
Groundwater Basins. This hydrogeologic
conceptual understanding is critical for
developing an understanding of the water
budget for a groundwater basin, including
recharge and discharge terms, potential areas
for water quality concerns, and advantageous
locations to maximize groundwater recharge.
We can help you navigate complex and
challenging water management issues
within the basin and provide sound technical
approaches for planning studies, such as basin
yield assessments, water quality evaluations,
well and aquifer hydraulic evaluations,
well siting and property selection, drought
mitigation projects, and recharge analyses.
Geoscience is unique in that we focus on
groundwater resources and can provide
support for both groundwater modeling
investigations and groundwater infrastructure
design. These capabilities allow us to perform
comprehensive investigations encompassing
multiple aspects of basin management.
Geoscience has successfully completed
numerous basin safe yield projects and
basin-wide modeling projects where multiple
stakeholders with different interests were
Site Suitability Map
gssiwater.com 5
involved. Two projects in Southern California
include the Antelope Valley, which was one
of the largest groundwater adjudication
cases in the State’s history. The other was for
Rancho California Water District (RCWD) and
Camp Pendleton Marine Corps Base. In the
Antelope Valley case, we successfully modified
an existing model to more accurately reflect
groundwater inflows and outflows working
with more than 120 separate stakeholders to
agree on the conceptual model. As a result,
the case was settled. On the RCWD project
we gained agreement from the District and
military base, entirely preventing litigation and
preserving federally reserved water rights.
Groundwater project planning and
investigations can span many years and go
through several iterations before a project
is implemented. We have the depth and
capability to provide support throughout
this process. Geoscience has supported
recharge feasibility studies in Mission Basin
since 2004. What began with a geohydrologic
investigation of the Lower San Luis Rey River
Valley Groundwater Basin has evolved into the
Pure Water Oceanside Project, an IPR project
to maximize groundwater recharge and relieve
reliance on imported water. This process
has involved initial basin characterization,
exploratory drilling, geophysical surveys,
development and calibration of a groundwater
flow model, subsequent model updates and
refinements based on newer information,
development of solute transport model,
planning scenarios, and the installation of
injection and monitoring wells for IPR. We
continue to support the project as they enter
the pilot testing phase for final permitting
and are developing a tracer study to provide
necessary information for the Regional Water
Quality Control Board. We are also currently
working on similar phased feasibility studies in
San Dieguito Valley, Yucaipa, San Bernardino,
and Bonsall Groundwater Basins.
Groundwater Sustainability & SGMA
Compliance
Geoscience has extensive experience with
compliance and reporting for regulatory
agencies. In addition to regulatory reviews
developing GSPs and supporting CASGEM
monitoring efforts and annual GSP reporting,
we complete regular assessments of
available water resources in the field by
monitoring precipitation, aquifer recharge,
total quantities of groundwater in storage,
and the safe quantity of dewatered storage
that may be made available for a conjunctive
use project without harming the underlying
aquifer system or ecosystems that depend
upon it. This work is often done in support
of regional and state permitting processes
and has included establishing and designing
monitoring networks and protocols, providing
permit support, field support and collecting
monitoring data, maintaining electronic
databases, uploading data to on-line
databases, presenting monitoring information
and characterizing hydrologic conditions for
compliance reporting.
While Geoscience routinely provides officebased support, we also have the field capabilities to provide pilot testing, field
oversight, or monitoring necessary for
compliance. Previous activities for regulatory
compliance have included conducting
tracer studies, pumping and aquifer tests,
and monitoring groundwater elevations,
groundwater and surface water quality,
surface flow, and subsidence.
We know by experience, and completing
numerous groundwater management studies,
the importance of efficient and accurate data
collection and presentation of monitoring data
for compliance reporting. We use a rigorous
set of Quality Assurance and Quality Control
(QA/QC) standards that we have developed
in similar projects to collect and ensure the
accuracy and quality of data in our reports.
As the main consultant supporting
development of the Upper San Luis Rey
Valley GSP, Geoscience reviewed available
Pilot Test Well Monitoring & Reporting
gssiwater.com 6
monitoring sites within the basin, identified
wells for the GSP monitoring network,
developed a sampling and analysis plan,
oversaw or conducted quarterly water level
and water quality monitoring, and uploaded
required monitoring well data to the State’s
Monitoring Network Module. Monitoring data
was also analyzed and reported in the first
annual GSP report for the Basin to track basin
sustainability goals relative to GSP-defined
sustainability management criteria. We are
also currently supporting Pauma Valley GSA
efforts to address data gaps in the area by
establishing new monitoring points, including
a NOAA weather station, new monitoring well,
and potential streamflow gage.
We have also had the opportunity to be
involved in many long-term monitoring efforts
to support proposed groundwater projects.
Our monitoring work for CalAm’s Monterey
Peninsula Water Supply Project extends
back to 2012 where we sited, designed,
and oversaw the installation of eight (8)
monitoring well clusters for the groundwater
level and water quality monitoring network,
each with three (3) wells completed
at different depths. The wells provide
information to assess and continually evaluate
hydrogeologic conditions in the vicinity of the
slant well field, assess effects of Test Slant Well
pumping, monitor movement of groundwater,
and collect data to facilitate model calibration
and evaluate potential Project impacts.
Weekly monitoring was conducted during the
nearly two and a half year long-term pumping
test and summarized in monitoring reports.
Since then, we have continued to provide
monthly monitoring and quarterly reporting.
During the course of the project, we have
issued more than 200 monitoring reports per
permitting requirements and for review by
the California Public Utilities Commission and
California Coastal Commission.
Long-term monitoring efforts in the
Mojave Desert have also been in progress
since 2017 in support of the Cadiz Valley
Groundwater Conservation, Recovery,
and Storage Project. We developed the
comprehensive Groundwater Management,
Monitoring and Mitigation Plan (GMMMP),
which was reviewed by an independent
Groundwater Stewardship Committee,
successfully approved by California’s Courts,
and is enforced by San Bernardino County.
The GMMMP includes over 100 monitoring
features that we help collect data for, maintain
in databases, and present in annual and 5-year
reports.
Geoscience developed a monitoring program
that was a precursor to CalGEMS underground
injection control (UIC) program that included
siting, design, and construction management
of three (3) sets of deep (1,400+ ft) nested
monitoring wells, pulse testing of the wells
to determine connection between the
hydrocarbon production zones and shallow
groundwater, time series deconvolution to
remove tidal influence on the transducer
data record, and sampling of the wells. We
correlated results to the records from an
Orange County Water District Westbay well to
identify which Westbay packers and ports had
failed, and developed a sampling protocol to
compare the results from the nested wells and
Westbay well.
Other routine compliance reporting is
often conducted at the direction of the
Regional Water Quality Control Board or
local Watermasters, including modeling
and reporting pursuant to the Cooperative
Agreement to Protect Water Quality and
Encourage the Use of Imported Water in
the Santa Ana River Basin (conducted for
Yucaipa, San Bernardino, Rialto-Colton, and
Riverside-Arlington Subbasins), Waste Load
Allocation Model update and reporting for
the Upper Santa Ana River Valley Watershed,
and monitoring and periodic updates of the
Murrieta-Temecula Ground Water Basin
surface and groundwater model associated
with Santa Margarita River Watermaster
annual reporting and the Cooperative Water
Resource Management Agreement.
Water Supply Wells
Water supply well design and drilling projects
require several different tasks to be performed
in order to provide a fully-functional well.
Our typical approaches to each of these tasks
include the following:
Preliminary Design
Geoscience shall perform the following tasks
for preliminary design related to water supply
wells, including production wells, injection
wells, and recovery/extraction wells. Tasks
covered by Geoscience shall include the
gssiwater.com 7
following:
6 Evaluate the condition of the existing
water system, historical demands, and
future demands of water systems to be
consolidated with the City.
6 Provide a cost-effective recommendation
for the replacement and/or improvement
to the City’s system.
6 Perform demand analysis and forecasting
6 Strategic water supply analysis
6 Perform hydrogeological modeling,
analysis of the well system and the
impacts of new well connections on the
City’s system.
6 Provide preliminary construction cost
estimates for planning and budgeting.
Design
Geoscience shall perform the following tasks
for design related to water supply wells,
including production wells, injection wells,
and recovery/extraction wells. Tasks covered
by Geoscience shall include the following:
6 Provide water supply design services
utilizing the City’s standards to develop
water supply wells.
6 Provide water supply design services to
create the plans, specifications, and frontend documents for bidding on the projects for water supply wells.
6 Provide separate engineering construction
cost estimate for projects.
Construction Management
Geoscience shall perform the following tasks
for construction management related to water
supply wells, including production wells,
injection wells, and recovery/extraction wells.
Tasks covered by Geoscience shall include the
following:
6 Construction Meetings - Oversight and
Administration
6 Estimating and scheduling;
6 Construction cost and quality control;
6 Construction engineering; progress billing
review and approval.
6 Assistance with Contractor submittals
and requests for information during
construction.
Construction Inspection
Geoscience shall perform the following tasks
for construction inspection related to water
supply wells, including production wells,
injection wells, and recovery/extraction wells.
Tasks covered by Geoscience shall include the
following:
6 Construction meeting agendas, sign-in
sheets, and meeting minutes
6 Coordination and scheduling with
contractor, the City, and outside
inspectors,
6 Quality control and compliance with
project plans and specifications;
6 Construction inspection
6 Progress billing review and approval,
6 Daily project documentation with photos
and work progress.
Well Condition Assessments &
Rehabilitation
Condition Assessment
For well projects that require condition
assessments, Geoscience typically prepares a
technical memorandum assessing the current
condition of the well and provides a workplan/
technical specification for rehabilitation of the
affected well. For the condition assessment
tasks covered by Geoscience will include the
following:
6 Obtain, compile, and review background
data
6 Coordination with client staff to conduct
step drawdown testing of the well
6 Prepare condition assessment Technical
Memorandum, detailing efficiency
trends, available pumping test, and water
quality data. The TM will also include
recommendations for future rehabilitation.
Well Rehabilitation
Based on standard rehabilitation practices and
our understanding of each well’s construction
and current condition, Geoscience will
develop a rehabilitation and redevelopment
work plan (i.e., scope of work and cost
estimate). While it is usually not expected,
should conditions warrant this plan can be
modified as necessary. In addition to the
work plan, Geoscience will prepare technical
specifications and plans for the rehabilitation,
redevelopment, and testing of each well that
will generally include:
6 Well location, depths, dimensions, and
materials
6 Permits and regulatory requirements
gssiwater.com 8
6 Compliance with discharge requirements
(as necessary)
6 Job conditions (e.g., noise suppression,
runoff management, power, lighting,
water, security, sanitation, parking, traffic
control, and work damage)
6 Mobilization, demobilization, and site
cleanup
6 Equipment, materials, and records to be
furnished by the contractor
6 Records to be kept by the contractor
6 Removal and storage of existing pump
equipment
6 Well cleaning by brushing and bailing
6 Video and CITM survey
6 High energy mechanical development
6 Redevelopment by swabbing and airlifting
6 Well cleaning by chemical injection
6 Well redevelopment by pumping and
surging
6 Aquifer pumping and recovery test
protocol
6 Flowmeter survey
6 Field groundwater quality monitoring
protocol
6 Groundwater sampling protocol
6 Post-rehabilitation “dual-cam” downhole
video survey
6 Final well disinfection
In addition, Geoscience will provide
construction management services during
the well rehabilitation process to confirm
all aspects of the project are carried out in
a proper and efficient manner. Construction
management activities will include (but not
be limited to) coordinate contractor activities
prior to mobilization, review of contractor
invoices to verify accuracy and completeness,
review of and response to contractor Request
for Information (RFIs) and change order
requests for legitimacy, preparation of a final
“punch list”, and filing of essential paperwork,
correspondence, field notes, etc. Daily email
and/or phone updates will be provided along
with submittal of relevant photographs.
At the conclusion of rehabilitation activities,
Geoscience will prepare a technical
memorandum that summarizes the details
of the rehabilitation, redevelopment, and
testing process. The report will, at a minimum,
include the following:
6 Pre-redevelopment well condition
6 Chronology of activities
6 Description of methods used during well
rehabilitation and redevelopment
6 Well redevelopment results and postredevelopment well condition 6 Analysis and results of aquifer pumping
tests, Pump flow rate and intake level
recommendations and comparison to
current pump curve.
6 Other pertinent data, analytical results,
recommendations, and conclusions
6 The final report will be submitted 100%
FINAL report in electronic format
6 Other pertinent data and analytical results.
During redevelopment, we will observe mechanical
rehabilitation by brushing and bailing, as well as
rehabilitation and cleaning by chemical injection
gssiwater.com 9
Work Plan
In an effort to increase the water supply to
the City of Vernon’s distribution system and to
further utlize its groundwater resources, the
City is intending to design and construct a new
water supply well. As such, the City is currently
seeking a qualified hydrogeological consultant
to provide not only general hydrogeological
services, but also to prepare a preliminary
design report for Well No 23.
Geoscience has prepared a work plan to
accomplish the City’s goal of preparing a
preliminary design report for Well No. 23. The
tasks associated with this report are detailed
below:
TASK 1. GENERAL
ADMINISTRATION, PROJECT
MANAGEMENT, & MEETINGS
1.1. Project Management
Effective control of a project’s scope, schedule,
and budget is fundamental to achieving a
quality project. Our Project Team knows
that understanding and managing the
interrelationship of these three elements
largely determines the project’s success with
respect to budget. Scope creep increases cost
and produces delay. Delays increase costs
and cause critical milestones to be missed.
Geoscience understands these issues and has
demonstrated the ability to organize tasks,
manage level of effort, develop and monitor
critical-path schedules, and compare actual
costs to planned costs at key milestones. By
using these organizational techniques, as well
as good communication and coordination, a
quality, on-time, and on-schedule project is
ensured.
Geoscience will provide project management
services throughout the entire project to
confirm that all aspects are carried out
in a proper and efficient manner. Project
management activities will include (but not
necessarily be limited to) coordination and
correspondence with City of Vernon (City)
personnel, project schedule and status
updates, project budget monitoring, and
quality control and assurance. This task will
also include availability to assist with any
unforeseen issues which may arise throughout
the course of the project.
1.2. Project Kick-off , Design Phase
Status Meetings, and Monthly
Construction Phase Status Meetings
The primary objective of the project kickoff meeting will be to meet face-to-face with key project individuals to verify that
everyone understands the intent, objectives,
tasks, budgets, schedules, milestones, and
deliverables. The kick-off meeting also
identifies the individuals who are responsible
for implementing each part of the work.
Additionally, this meeting provides a forum to
discuss critical path tasks, and how those tasks
can be efficiently expedited.
During the design phase of the project, a
minimum of three (3) status meetings shall be
held with City of Vernon staff and the design
engineers to discuss any potential issues,
milestones, and answer questions. In addition,
during the construction phase of the project,
status meetings shall be held at a minimum
of once per month to track progress, address
issues, and establish milestones. At the
conclusion of the project, a close-out meeting
shall be held to confirm a smooth handoff
of the new facilities. For cost estimating
purposes, this proposal assumes one (1)
kickoff meeting and three (3) design phase
status update meetings (four (4) meetings in
total).
TASK 2. PRELIMINARY WELL
DESIGN
2.1. Data Collection, Review, and Site
Reconnaissance
Ahead of the preliminary design and
development of technical plans, specifications,
and contract documents, Geoscience will
obtain and review all relevant geohydrologic
data and other available background
information for the project area. While some
of this date is already available in Geoscience’s
in-house data base, additional data will be
gssiwater.com 10
requested from City. This data will include, but
not necessarily be limited to:
6 Existing borehole logs
6 Well construction details of near-by wells
6 Groundwater elevation data
6 Groundwater quality data from wells in
the area
6 Pumping and injection records from local
wells
6 Previous investigations conducted in and
around the project area
6 Well, pipeline, and other infrastructure
information
6 GIS files
2.2. Preliminary Design Documents
Geoscience personnel will conduct a site visit
to observe and document existing conditions
that may affect the feasibility of a well
construction project at the location. The data
collected in this task will serve as a basis for
the preliminary design report.
Geoscience will prepare a Preliminary Design
Report (PDR) for the new well, which will
address all components of the well drilling
process. All relevant geohydrologic data
and other available background information
regarding the chosen site will be reviewed
and incorporated into the PDR. PACE will also
incorporate any above ground and equipping
considerations in the PDR to ensure a smooth
and successful new well project from planning
to final equipping. It is assumed that the bulk
of this information will be obtained from
existing reports and documents or provided
by the City. This data will include, but is not
necessarily limited to:
6 Construction details of all existing wells in
the vicinity of the production well
6 Lithologic and geophysical logs from
existing wells and any other exploratory
boreholes that have been drilled in the
area of the well site
6 Existing hydrogeologic cross-sections
6 All relevant pumping and aquifer test
data, including nearby well performance
characteristics
6 Historical ground water elevation data
6 Ground water production history
6 Ground water quality information (depthspecific, if available) 6 Locations of utilities such as water
transmission lines and hydrants, gas
transmission lines, sewer lines and
manholes, and storm drains
The PDR will summarize the evaluation
of the well site and will include expected
ground water quality, ground water levels,
potential well production, potential well
interference, construction logistics and
conflicts, environmental issues, and
appropriate California State Water Resources
Control Board (CSWRCB) Division of Drinking
Water (DDW) separation distances from
existing utilities infrastructure. The report
will also include a preliminary design for
the production well, a basis of design,
preliminary design drawings, and a preliminary
construction schedule. At a minimum, the PDR
Preliminary Well Design
gssiwater.com 11
will include the following construction details:
6 Expected geohydrologic conditions and
impact on drilling
6 Recommended well drilling method
6 Expected depth and diameter of the well
6 Recommended casing materials &
dimensions
6 Depth of screened intervals
6 Filter pack gradation (glass beads vs
natural gravel)
6 Well appurtenance (i.e., sounding and
gravel feed tube design)
6 Site construction layout and access
considerations
6 Discharge considerations
6 Sequence of drilling operation
6 Noise abatement measures to be taken
during drilling.
Geoscience will submit the PDR to the City at
the 100% DRAFT stage in electronic format
(i.e., PDF) for review and comment. Upon
incorporation of comments, Geoscience will
submit three (3) bound hard copies of the
FINAL PDR in addition to electronic (i.e., PDF)
format.
gssiwater.com 12
ABOUT GEOSCIENCE
Founded in 1978 by Dr. Dennis Williams,
Geoscience Support Services Inc. (Geoscience)
was one of the first hydrogeology firms in
California established to provide consulting
services to the groundwater industry. Our firm
is a trusted advisor to industry professionals
and stakeholders—delivering solutions
to groundwater supply, development,
management, and protection challenges that
meet the changing needs of our clients.
For more than 45 years, Geoscience has been
serving the water districts and municipalities
of Southern California, performing work in
nearly every basin and completing more than
2,050 groundwater projects and more than
1,250 projects within the Santa Ana River
Watershed. Geoscience is one of the first,
and today is one of the largest, groundwaterfocused consultancies in the state. We are also world-renowned for well expertise, assisting
in the development of the national standards
for well design and performing design and
construction inspection/observation on more
than 1,050 wells in California and worldwide.
In this section, Geoscience has provided firm
and staff qualifications and experience with
the following service areas:
6 Groundwater Studies and Models
6 Water Supply Wells
6 Groundwater Consulting
6 Groundwater Sustainability & SGMA
Compliance
Subconsultant - PACE
Since the City is also requesting
services to prepare a PDR for
Well No. 23, Geoscience has
added PACE to our team to
cover the engineering aspects of the project
PDR. Pacific Advanced Civil Engineering,
Inc. (PACE) is a specialized civil engineering
firm dedicated to providing advanced water
engineering solutions. They offer a wide-range
of engineering services related to water,
wastewater, and stormwater management
and water resource permitting and regulatory
compliance to ensure projects are both
economically viable and environmentally
sustainable. Their engineering approach
focuses on maximizing value by creating multiuse infrastructure systems, cost-effective phasing strategies, and systems that include
environmental, aesthetic, and recreational
uses.
With more than four decades of hydrogeologic experience within the watersheds and basins of Southern California, our team has the depth of knowledge you need to assist with all of your hydrogeologic projects.
AAbiiliity of the PProposser to PPerform
Company Headquarters:
160 Via Verde, Suite 150
San Dimas, CA 91773
P: 909.451.6650 | F: 909.451.6638
E: [email protected]
Mailing Address:
PO Box 220
Claremont, CA 91711
Contact / Representative:
Brian Villalobos, PG, CHG, CEG
P: 909.451.6645 | F: 909.451.6638
E: [email protected]
Type of Business Organization: Corporation
(CA), Small Business certified (CA DGS,
#2015825)
Federal Tax ID No.: 95-3200498
Number of years in business: 47
Number of staff: 23
Practice Disciplines:
6 Hydrogeological/Basin Planning Studies
6 Groundwater/Surface Water Modeling
6 Hydrogeological Compliance & Reporting
6 Well Siting & Design
6 Well Construction Management &
Inspection
6 Hydrogeological Litigation Support
GEOSCIENCE by the Numbers
gssiwater.com 13
Potable water well designs require careful
consideration of expected operating levels
to properly design the hydraulic pumping
equipment for maximum efficiency. PACE
is familiar with the City’s water system
infrastructure and current water quality
concerns, as they helped evaluate and design
the City’s newest and largest producing well,
No. 22. Currently, they are evaluating water
quality at all seven (7) of the City’s active wells
to develop effective and feasible treatment
options that reduce levels of manganese,
iron, and PFAS. Overall, PACE has a successful
track record of delivering projects for the City
that meet design standards and expected
schedules.
PACE and Geoscience have collaborated on
several groundwater projects in the past 20
years to support sustainable and resilient
water resources, including as part of on-call
teams for the City of Long Beach, City of
Anaheim, and Los Angeles County. Recent
project experience together has included
providing well assessment, analysis, and
rehabilitation design for Anaheim Public
Utilities.
QUALIFICATIONS &
EXPERIENCE OF THE FIRM
Hydrogeologic Modeling Services &
Data Science
For nearly five decades, Geoscience has
played a lead role in solving water resource
problems for cities and water districts
throughout Southern California, and is among
the leaders in the development and use of
groundwater and surface water models as
a tool to assist in the interaction between
surface water and groundwater, and water
resource planning and management. We are
well-versed in the application of models used
in conjunction with geohydrological studies,
basin management and planning, and in
litigation support.
Our hydrogeologic modelers have substantial
experience with the use of surface and
groundwater flow models to better
understand groundwater level changes, safe
yield and groundwater flow movement.
We also bring deep technical knowledge
and expertise in the use of conceptual
hydrological modeling for evaluating the
movement of contaminants in surface water
and groundwater, having developed models
to identify, track and predict the contaminant
flow in geohydrological investigations,
groundwater basin studies and in water
quality studies. Our modeling team also
conducts and incorporates model updates,
refinements, and recalibrations into current
projects, thus capitalizing on existing data
sets for more effective use as a planning
tool. The reputation of the modeling team at
Geoscience is evidenced by numerous peer
reviews and training on the use of models
to regulators, including the USEPA and the
USGS. Our team members have completed
numerous hydrogeologic modeling projects
in 23 basins throughout Southern California.
Our modeling capabilities include groundwater
and surface water flow modeling (MODFLOW,
GSFLOW, HSPF, Petrel, and others), watershed
modeling, subsidence modeling from
groundwater pumping, waterfield modeling
for energy optimization, modeling for Injection
Barrier Wells, geohydrological assessments
and analyses, groundwater flow and solute
transport models, groundwater basin models,
and fate transport studies.
Hydrogeologic Planning Studies
Understanding the complexity of your
groundwater basin is an important first
step in the development and management
of sustainable groundwater resources.
Geoscience has broad hydrogeological
experience in the Central Groundwater Basin,
as well as the adjacent Santa Monica, West
Coast, and San Gabriel groundwater basins.
This hydrogeologic conceptual understanding
is critical for developing a comprehensive
knowledge of the underlying geology of a
groundwater basin, including recharge and
discharge terms, potential areas for water
quality concerns, and advantageous locations
to maximize groundwater supply and recharge.
We can help you navigate complex and
challenging water management issues
within the basin and provide sound technical
approaches for planning studies, such as
basin yield assessments, water quality
evaluations, well and aquifer hydraulic
evaluations, well siting and property selection,
drought mitigation projects, and recharge
analyses. Geoscience is unique in that we
focus on groundwater resources and can
gssiwater.com 14
provide support for both groundwater
modeling investigations and groundwater
infrastructure design. These capabilities allow
us to perform comprehensive investigations
encompassing multiple aspects of basin
management. Geoscience provides study
support for basin characterizations, feasibility
studies (recharge, conjunctive use, storage,
recovery, and desalination), water quality
investigations, geohydrological assessments
and investigations, and tracer testing.
Water Supply Wells
Our expertise comes from practical, handson experience designing and working on hundreds of municipal, high capacity water
wells. We also design and supervise well
construction for municipal and private clients
and are often called upon to help increase
water production efficiency and troubleshoot
and test existing wells for water quality and
other issues. Our team helps agencies assess
and manage well infrastructure to prolong
well life, minimize long term expenses, and
improve water supply reliability. Geoscience
offers several services fow water supply
wells including well siting and specification,
well operation modeling and scenario
development, well design (monitoring,
injection, extraction, production, etc.), well
rehabilitation, construction observation, well
development, inland and ocean desalination
subsurface intakes, and slant wells
Groundwater Sustainability & SGMA
Compliance
Successful basin management requires a
thorough knowledge of basin geohydrology,
understanding environmental issues
and concerns, collecting accurate and
comprehensive data, and developing
adequately calibrated models. We have
designed and implemented sustainability
plans for numerous California water agencies,
including those with jurisdiction in overlying
basins or in basins covered by multiple
agencies for more than four decades. Because
of our experience, we can efficiently help
clients complete groundwater management
plans and comply with SGMA requirements.
Our services include crafting Groundwater
Sustainability Plans (GSPs), ensuring SGMA
compliance, performing geohydrological
assessments and investigations, providing
Drinking Water Source Assessment and
Protection (DWSAP) Program services,
calculating sustainable/perennial yield of
water basins, and providing annual reports
and urban groundwater management plans.
CURRENT RELEVANT
EXPERIENCE
The Geoscience team has completed
numerous groundwater projects, including
hydrogeological basin studies, groundwater
monitoring programs, well condition
assessments, and well design, construction,
and rehabilitation. We also have extensive
expertise in groundwater modeling, and our
team’s knowledge of Southern California
basins and stakeholders can provide you with
reliable and robust tools for your current and
future efforts.
A list of our current, ongoing relevant projects
is located below and on the following pages,
with short descriptions of each project. In
addition, we have provided our reference
projects at the end of this section, with
detailed descriptions located in Appendix
B. For those projects, we have included the
beginning and end dates, relevant services
provided, participating key personnel, and our
client contacts for each project.
Table 1: Current Relevant Project Experience
Project Name Client Name Description of Services Project Dates
Well Design & ConstructionWell RehabilitationGroundwater ConsultingHydrogeological StudiesGroundwater ModelingGroundwater Sustainability CDA Extraction Well II-13,
Monitoring Wells 6 & 7
Chino Basin
Desalter Authority
Provided design and construction inspection
for three new extraction wells
2024 -
present x
gssiwater.com 15
Project Name Client Name Description of Services Project Dates
Well Design & ConstructionWell RehabilitationGroundwater ConsultingHydrogeological StudiesGroundwater ModelingGroundwater Sustainability San Dieguito Valley
Hydrogeological Studies Olivenhain MWD Feasibility study to see if 1 MG potable water could be produced from brackish groundwater 2016 -
present x x x
ASR Injection and Recovery
Wells Yucaipa Valley WD Design and development of three injection wells and two recovery wells 2023 -
present x x x
Upper San Luis Rey Valley
GSP
Yuima Municipal
WD
Hydrogeologic studies and GSP preparation
with modeling, and sustainability planning
2019 -
present x x x x
Pismo Beach Regional GW
Sustainability Project City of Pismo Beach Groundwater modeling and investigations for injection well recharge 2016 -
present x x x
Doheny Desalination
Project South Coast WD Multi-phased studies, test well, and design for full scale ocean water desalination project 2005 -
present x x x x
Well #53 City of Ontario Design, development, and construction inspection of a new production well
2022 -
present x
University Well No. 2 Camrosa Water
District
Design, development, and construction
inspection of a new production well
2022 -
present x
Well No. 8 Rehabilitation &
Lining City of Whittier Construction inspection and support of a well rehabilitation with liner installation
2024 -
present x
Terra Cotta Well Rehabilitation Elsinore Valley MWD Rehabilitation of an existing production well 2024 - present x
West Victorville Groundwater
Banking Pilot Test Project Mojave Water Agency Feasibility study, well and recharge basin design for a groundwater banking project
2024 -
present x x x x x
UVDC Wells 173, 174, and 175 Rancho California WD Design, development, and construction inspection of three new production wells
2023 -
present x
Willowbrook Well #4 Golden State Water
Co.
Design, development, and construction inspection
of a new production well
2022 -
present x
Wellfield Asset Management Camrosa Water
District
Development of a wellfield management
plan, including condition assessments and
rehabilitation schedule
2023 -
present x x x
La Cañada Flintridge Well
Replacement Valley Water Co. Design, development, and construction inspection of a new replacement production well
2023 -
present x
Hydrogeological Evaluation
and GW Supply Development City of Glendale Provide as-needed hydrogeological services for a groundwater evaluation and supply development
2021 -
present x x x
Brackish Water & Seawater
Desalination Studies Metropolitan WD Feasibility studies for the desalination of brackish water and coastal seawater in LA County
2024 -
present x x
gssiwater.com 16
TEAM QUALIFICATIONS &
EXPERIENCE
For more than four and a half decades,
Geoscience has specialized in groundwater
and surface water modeling and studies,
water quality investigations and consulting,
and groundwater wells and rehabilitation,
resulting in a team with extensive experience
in groundwater modeling, hydrogeologic
studies and consulting, as well as well design
and development.
Our team members are also experts in the
development of groundwater and surface
water models. Groundwater flow and solute
transport models are used for management
purposes and assist in understanding
groundwater level changes, safe yields, and
groundwater movement. This experience
includes evaluating the movement of
contaminants in groundwater and surface
water, developing groundwater and surface
water models to identify, track and mitigate
contamination, and providing expert testimony
in litigation matters. With our modeling
experience and knowledge, our team can
provide accurate and sufficient information to
help you assess potential water quality issues.
Assigned Staff
Brian Villalobos, PG, CHG, CEG will serve as our
assigned client manager and will oversee all
task orders for this contract. Brian is supported
by two additional project managers, who have
substantial hydrogeologic modeling, and well
design and development experience having
recently completed several new production
wells in Riverside and the surrounding
counties, as well as updates of our models for
various basins throughout Southern California.
The organization chart below lists our assigned
staff and their role on this contract, as well
as the lines of communication. We have also
included detailed resumes in Appendix A.
Proposed Team Organization
Chart
Technical Advisor and
QA/QC Review
Mark Williams, PhD, PE
Client Manager
Brian Villalobos, PG, CHG, CEG
Tim Chen, PE
Senior Modeler
David Barnes, MS
Senior Modeler
Si Si, MS, EIT
Project Modeler
Leo Liu, MS, EIT
Project Modeler
Calvin Anderson Associate Modeler
Matthew McComb
Associate Modeler
Jia Fan
Associate Modeler
Bidisha Fifer
Associate Geohydrologist
Lauren Wicks, PG
Senior Geohydrologist
Nathan Reynolds, PG
Project Hydrogeologist
Steve Turnbull, PG
Senior Geohydrologist
Robert Sia, GIT
Project Geohydrologist
Coral Shaw, GIT
Project Geohydrologist
Andrew McCarthy
Senior Associate Geohydrologist
Lindsay Mota
Associate Geohydrologist
Lauren Wicks, PG
Senior Geohydrologist
Nathan Reynolds, PG
Project Hydrogeologist
Hydrogeologic Modeling Hydrogeologic Planning Studies Water Supply Wells Groundwater Sustainability & GSMA Compliance
Nicolette Nguyen
Associate Geohydrologist
Nicolette Nguyen
Associate Geohydrologist
Seth Kuiper, GIT
Project Geohydrologist
Deputy Client Manager
Logan Wicks, PG
Johnson Yeh, PHD, PG, CHG
Principal Modeler / Project Manager
Brian Villalobos, PG, CHG, CEG
Principal Hydrogeologist / Project Manager
Logan Wicks, PG
Senior Geohydrologist /Project Manager
Brian Villalobos, PG, CHG, CEG
Principal Hydrogeologist / Project Manager
City of
VERNON
PACE
Engineering Subconsultant
gssiwater.com 17
Key Team Members
Team Member & Role Specific Expertise
Brian Villalobos, PG, CHG, CEG
Principal Geohydrologist / Client
Manager / Hydrogeological Studies
& Groundwater Sustainability &
GSMA Compliance Lead
6 Nearly 35 years of groundwater resource studies and reports 6 Specific expertise in hydrogeologic investigations to support groundwater basin characterization, indirect potable reuse, and groundwater recharge 6 Has led efforts to develop studies and reports including monitoring well networks, sustainable yield, and water budgets
Mark Williams, PhD, PE
Principal Engineer/ Technical Advisor
and QA/QC Review
6 Nearly 30 years of groundwater experience, focused on municipal water quality 6 Has participated in numerous studies focusing on water quality investigations and worked on a range of water quality projects including studies on nitrates, NDMA, perchlorate, and bromate in municipal water supplies.
6 Responsible for pilot testing of recharge facilities at RCWD for health department permitting compliance
Johnson Yeh, PhD, PG, CHG
Principal Modeler, GW Modeling &
Data Science Task Lead
6 Specializes in watershed and groundwater modeling, hydrogeologic investigations, groundwater basin and water quality studies, and artificial recharge 6 Develops detailed and thorough groundwater models that help inform future groundwater management strategies and decisions
David Barnes, MEng
Sr. Modeler, GW Modeling & Data
Science Support
6 More than 15 years of experience performing groundwater modeling and studies for municipal clients and public agencies, specializing in the development of groundwater and hydrogeologic models, data processing, and GIS 6 Experienced in well design and construction processes with wide-ranging experience in field hydrology, aquifer testing, and characterization methods Tim Chen, PE
Sr. Modeler, GW Modeling & Data
Science Support
6 Nearly a decade of experience with groundwater and environmental investigations performed for numerous municipalities and state agencies 6 Experienced in groundwater flow and solute transport modeling, geohydrologic investigations, ground water basin and water quality studies, watershed modeling and management, and artificial recharge projects
6 Also experienced in well equipping design and developing GIS applications Logan Wicks, PG
Sr. Geohydrologist / Deputy CM
Water Supply Wells Task Lead
6 More than 16 years of experience on more than 30 municipal direct/alternative supply wells
6 Completed more than 75 well field assessments and groundwater studies 6 Experience includes geohydrologic investigations, groundwater quality studies, artificial recharge, water well test drilling programs, and the management and supervision of water well projects including: siting, design, aquifer pumping test analyses, and well construction
Steve Turnbull, PG, CHG
Sr. Geohydrologist, Water Supply
Wells Support
6 40 years of experience designing and installing water wells including monitoring, supply, high-capacity, and others
6 23 years of experience drilling and installing monitoring and production wells in volcanic basalt formations (Hawaii, from 1991 to 2014)
Lauren Wicks, PG
Sr. Geohydrologist, Hydrogeological
Planning Studies / Groundwater
Sustainability & GSMA Compliance
Support
6 More than 10 years of experience supporting groundwater modeling, sustainable yield studies, and calculating water budgets - helping to provide more accurate and thorough models and studies to present basin sustainability improvement options 6 Performs groundwater flow and transport modeling, hydrogeologic investigations, groundwater basin and water quality studies, artificial recharge projects, and has experience in GIS mapping, watershed management, database development and management
gssiwater.com 18
Team Member & Role Specific Expertise
Nathan Reynolds, PG
Project Geohydrologist,
Hydrogeological Planning Studies /
Compliance & Reporting Support
6 More than 19 years of experience completing hydrogeologic investigations, source contaminant analysis, ground water quality studies, artificial recharge projects, water well test drilling programs, and construction observation for a variety of drilling projects
6 Experience includes both monitoring and groundwater studies—manages the data collection, and long-term reporting of extensive monitoring well networks, with special focus on water quality database creation and management Si Si, MS, EIT
Project Modeler, GW Modeling &
Data Science Support
6 A decade of experience in groundwater and environmental investigations, specializing in groundwater modeling
6 Has conducted groundwater flow and solute transport modeling, hydrogeologic investigations, groundwater basin and water quality studies, watershed modeling and management, groundwater waste discharge permitting, GIS mapping, and database development and management
Leo Liu, MS, EIT
Project Modeler, GW Modeling &
Data Science Support
6 10 years of experience with groundwater and environmental investigations performed for municipalities and state agencies
6 Currently conducts groundwater flow and solute transport modeling, hydrogeologic investigations, groundwater basin and water quality studies, watershed modeling and management, and modeling for artificial recharge projects Seth Kuiper, PG
Project Geohydrologist, Water
Supply Wells
6 Field experience supporting well construction, development, and testing projects 6 Well versed in the inspection of pilot borehole drilling and reaming, casing inspection and installation, air lifting and swabbing, development by pumping, and down-hole video logging
6 Conducted water quality sample collections of groundwater and surface water, as well as geohydrologic investigations
Coral Shaw, GIT
Project Geohydrologist,Water Supply
Wells
6 Nearly a decade of experience performing well construction inspection for tasks such as pilot borehole drilling and reaming, casing inspection and installation, air lifting and swabbing, development by pumping, and down-hole video logging 6 Has also performed various pumping test analyses, including large scale pumping tests and water quality sample collection, as well as final well designs based on data collected during the drilling process
Robert Sia, GIT
Project Geohydrologist, Water
Supply Wells
6 More than a decade of experience focused on groundwater recharge and banking, construction management, environmental site investigations and characterization, and regulatory compliance.
6 Experienced with managing from the field all aspects of exploratory drilling and well construction including development, pump testing, disinfection, water quality sampling, as well as well rehabilitation
Andrew McCarthy
Sr. Associate Geohydrologist, Water
Supply Wells
6 More than a decade of geological consulting experience, including basin and reservoir studies and mapping, wellsite supervision and logging, regulatory filings, and reservoir modeling
6 Currently provides field supervision during well design and construction, water quality sampling and analyses, and assisting in the completion of well summary reports
gssiwater.com 19
Team Member & Role Specific Expertise
Calvin Anderson
Associate Modeler, GW Modeling &
Data Science Support
6 Supports the development of groundwater models and conducting model runs for groundwater resource projects
6 Experience includes organizing and interpolating water quality data to create three model layers to calculate initial Nitrate and TDS concentrations and creating nitrogen loading criteria based on land use and recharge volume 6 Supported modeling efforts in the completion of a GSP for the Arlington Basin, identifying potential areas of improvement in the model results and updating and creating files for model runs
Matthew McComb
Associate Modeler, GW Modeling &
Data Science Support
6 Supports our modeling team specializing in the collection and evaluation of geological, hydrogeological information, in combination with spatial data 6 Experience in GIS mapping and database support - using these tools to transform and display complex information and aerial distributions 6 Also performs field work including data collection and sampling, drilling, well installation, system maintenance, aquifer testing, and construction oversight Lindsay Mota
Associate Geohydrologist, Water
Supply Wells
6 Currently performs well assessments, groundwater level monitoring, and water well test drilling programs
6 Experienced in field supervision during well design and construction, water quality sampling and analyses, and well rehabilitation/redevelopment Nicolette Nguyen
Associate Geohydrologist,
Hydrogeological Planning Studies /
Water Supply Wells
6 Performs well siting studies and has contributed to the development of Geoscience’s proprietary Site Suitability Analysis Tool
6 Provides permitting assistance, collecting and analyzing data, and developing technical reports and maps
6 Has experience with field supervision during well design and construction, water quality sampling and analyses, and completion of DWSAP assessments Duncan Lee, PE
PACE
Design Manager, Water Supply Wells
- Engineering Support for Well 23
6 36 years of engineering experience with technical expertise on the engineering of municipal water infrastructure as both a designer and a City project manager 6 Served as the Project Manager for the City of Vernon’s Well No. 22, demonstrating knowledge of city infrastructure and well network
6 Serving as Project Manager to evaluate water quality concerns at the City of Vernon’s seven active well locations and design a treatment system to reduce levels of manganese, iron, and per- and polyfluoroalkyl substances (PFAS) Jacob Peterson, PE
PACE
Civil Engineer, Water Supply Wells -
Engineering Support for Well 23
6 21 years of experience in engineering design for water supply projects and facilities including treatment systems, pump stations, water conveyance, and water supply wells
6 Serving as the Sr. Project Engineer to evaluate water quality concerns at the City of Vernon’s seven active well locations and design a treatment system to reduce levels of manganese, iron, and per- and polyfluoroalkyl substances (PFAS) References
As mentioned previously in this section, Geoscience has provided several reference projects with client contacts and detailed descriptions of services provided. The reference contact information is provided on the following page with the detailed project descriptions located in Appendix B.
gssiwater.com 20
Reference Project 1
Project: Oak Valley Town Center Recharge Project Client: Yucaipa Valley MWD Contact: Joe Zoba, GM Phone: 909-797-5117 Email: [email protected] Project Dates: 2018 - Present (ongoing)
Relevant Services: GW Modeling,
Hydrogeologic Studies, Wells, Permitting
Team Members: Brian Villalobos, Logan Wicks,
Johnson Yeh, Lauren Wicks, Nathan Reynolds
Reference Project 2
Project: Upper San Luis Rey GSP Client: Yuima MWD
Contact: Amy Reeh, GM Phone: 760-742-3704 Email: [email protected] Project Dates: 2019 - Present (ongoing - updates and monitoring) Relevant Services: GW Modeling,
Hydrogeologic Studies, GSP Preparation
Team Members: Brian Villalobos, Johnson Yeh,
Lauren Wicks, Nathan Reynolds
Reference Project 3
Project: Well Rehab and New Well Construction Client: Elsinore Valley MWD Contact: Jesus Gastelum Phone: 760-518-6266 Email: [email protected] Project Dates: 2016 - present (well rehab); 2018 - 2022 (Lee Lake Wells) Relevant Services: Hydrogeologic
Studies, Wells, Well Rehabilitation
Team Members: Brian Villalobos, Logan Wicks,
Coral Shaw
Reference Project 4
Project: Monitoring & Reporting - Cadiz Water Project Client: Cadiz, Inc.
Contact: Lesley Thornburg Phone: 760-861-0603 Email: [email protected] Project Dates: 1997 - Present (ongoing monitoring and sampling) Relevant Services: Hydrogeologic Studies,
Wells, Monitoring, GW Sustainability
Team Members: Logan Wicks, Robert Sia, Nicolette
Nguyen, Lindsay Mota
Reference Project 5
Project: Anaheim Well Rehabilitations Client: Anaheim Public Utilities Contact: Divya Agrawalla Phone: 714-765-4964 Email: [email protected] Project Dates: January 2025 - Present
Relevant Services: Well Site Evaluations,
Well Rehabilitations, Development of
Rehabilitation Plans
Participating Team Members: Logan Wicks, Steve
Turnbull, Lindsay Mota, Andrew McCarthy, Duncan
Lee (PACE)
Reference Project 6
Project: Water Well No. 22 Improvements Client: City of Vernon Contact: Joanna Moreno Phone: 323-583-8811 Email: [email protected] Relevant Services: Wells Participating Team Members: Duncan Lee (PACE) Appendix A:
Detailed Team Resumes
Years of Experience: 34
Years with Geoscience: 16
Education and Professional Registrations/
Certifications:
6 BS, Geology, California State University, Los Angeles 6 California Professional Geologist (No. 4153)
6 Certified California Hydrogeologist (No. 794)
6 Certified California Engineering Geologist (No. 1298) Brian has more than 32 years of professional experience in geohydrology and environmental geology throughout the
Southern California region. His specific areas of expertise are in hydrogeologic investigations to support indirect potable reuse, groundwater recharge, and groundwater
basin characterization projects. He has studied and modeled groundwater basins across the State and has led efforts to develop studies and reports including, monitoring well networks, groundwater recharge projects, sustainable yield, water budgets, and more. He currently serves several cities and water districts to develop and assess groundwater
recharge projects, including the City of Oceanside, Elsinore Valley Municipal Water District, San Bernardino Valley
Municipal Water District, Yucaipa Valley Water District, and others. Brian has also supported 20 groundwater related litigation cases serving as either the lead technical advisor or in a support role.
Summary of Experience:
City of Santa Monica: Well Rehabilitation and Replacement Priority Evaluation Brian provided technical and quality reviews for a well condition assessment report that provided recommendations for a systematic rehabilitation/replacement program for the City of Santa Monica.
The evaluation assessed 14 groundwater extraction wells using a scoring and ranking matrix designed to identify wells that are most in need of immediate attention, while also providing a framework for future well maintenance and replacement planning. Well-specific recommendations for rehabilitation for five wells were provided based on the available data, the results of the scoring and ranking matrix, and City plans.
City of Oceanside: Groundwater Well Site Evaluation
Brian provided technical and quality reviews for a geohydrologic assessment evaluating the local aquifer systems, groundwater production potential, and water quality. Using a weighted ranking matrix based on 13 criteria, locations that maximized production potential while mitigating risks related to environmental hazards and land use constraints were identified and prioritized. Refined from an initial preliminary site selection process to seven locations, each were assessed against multiple criteria including groundwater availability, potential interference with existing wells, and environmental considerations.
City of Oceanside/RMS: Mission Basin Model Update and Evaluation of Indirect Potable Reuse
Brian developed a geologic and hydrologic conceptual model and a groundwater flow and solute transport model for a 22-square mile area, covering the entire Mission Groundwater Basin near Oceanside, California. The model was used to site and evaluate potential movement of recycled water from proposed injection sites.
Brian Villalobos, PG, CHG, CEG
Principal Geohydrologist / Client Manager
6 More than 30 years of
groundwater resource
studies and reports
6 Specializes in groundwater
recharge and water reuse
6 Certified Hydrogeologist
and Engineering Geologist
6 Experience supporting
more than 20 groundwaterrelated litigation cases.
KEY QUALIFICATIONS...
gssiwater.com A-1
City of Oceanside: Pure Water Oceanside
Brian was the project manager of a team that conducted a phased evaluation to characterize the Mission Basin and study the feasibility of Groundwater Storage and Recovery projects in the Lower San Luis Rey River Valley in northern San Diego County, California. With the findings suggesting the potential for a conjunctive-use storage project in the Mission Basin (MGB), a geohydrological groundwater model (Mission Basin Ground Water Model) was redeveloped and updated using these results. Geoscience was also tasked with investigating groundwater replenishment reuse projects (GRRP) using treated wastewater from the City’s SLRWRF that would otherwise be discharged to the ocean. A series of groundwater analyses were conducted, technical and regulatory issues were analyzed, advanced wastewater treatment methods were identified, and groundwater recharge project options were developed. Based on the findings, the City and our team moved forward with the development of an indirect potable reuse (IPR) groundwater augmentation project known as Pure Water Oceanside and expanding the City’s existing Title 22 tertiary recycled water distribution system.
Yucaipa Valley Water District: Oak Valley Town Center Recharge Project Brian is leading efforts to complete a feasibility study for a recycled water recharge project. To complete the study, our team developed a focused groundwater model, a 3-D lithologic model, and developed a test infiltration basin.
Olivenhain Municipal Water District: Groundwater Supply and Brine Management Program Olivenhain Municipal Water District relies almost entirely on imported water from the California and Colorado Aqueducts. To reduce independence on imported water, Brian is leading our team’s efforts to determine the safe yield available in the San Dieguito basin; and determine locations for well fields, treatment facilities, pipelines, and brine discharge facilities. Currently our team is collecting data, completing a hydrological investigation and updating the current groundwater model. We are also developing preliminary well designs, recommending brine management activities, supporting community outreach, and completing desk-top environmental reviews.
Elsinore Valley Municipal Water District: Warm Springs Subbasin Hydrogeological Investigation
Warm Springs Groundwater Subbasin is a small, sedimentary groundwater subbasin located within Elsinore Valley Municipal Water District’s service area. To meet long‐term population growth and increasing water demand, the District is exploring options to develop water resources within the Warm Springs Subbasin. Brian led our team and to complete a hydrogeologic investigation to quantify the groundwater storage and safe yield of the Warm Springs Subbasin, estimate yield for future municipal supply well, determine water quality in the subbasin, identify needed potable water conveyance infrastructure, and plan environmental and permitting requirements.
Western Municipal Water District: Riverside-Arlington Basin Groundwater Sustainability Plan
Brian is leading efforts to develop a GSP for the Riverside-Arlington Basin. The Basin is classified by DWR as a medium-priority basin and is one of the district’s primary sources of local water supply. Brian and our team are working in conjunction with the district to complete all studies and investigations necessary to complete a compliant GSP. Specific activities include supporting grant administration and stakeholder engagement, assessing and developing a data management system, reviewing monitoring networks and providing recommendations, and defining the plan area.
California American Water Company: Monterey Peninsula Water Supply Project Brian is the project manager overseeing day to day project activities. The Monterey Peninsula Water Supply Project (MPWSP) will provide up to 6 million gallons per day (24,227 m3 ) of desalinated
water to relieve pressure on the local groundwater aquifer. Brian worked with our team to complete hydrogeologic studies of the area and design and install 24 monitoring wells to collect data. Brian oversaw our team’s efforts to design and construct a 724-ft (221 m) test slant well for a two-year pump test. The slant well consistently produced 2,100 gallons per minute (7.9 m3 per minute).
Brian Villalobos, PG, CHG, CEG
Principal Geohydrologist
gssiwater.com A-2
Yucaipa Valley Water District: Recycled Water Use Evaluation using the Gateway Sub-basin Focused Groundwater Model
Brian managed efforts to develop a geologic and hydrologic conceptual model and a groundwater flow and solute transport model for a 10 square mile area of the Gateway sub-basin and portions of five additional sub-basins. The model is being used to evaluate potential movement of recycled water from the Wilson Creek Spreading Basin.
San Bernardino County: Active Recharge Project from Tributaries of the Santa Ana River Brian led our team to develop a watershed model to estimate potential stormwater capture from 13 tributary Creeks to the Santa Ana River in the San Bernardino Valley. The project included preparing conceptual designs for stormwater capture facilities and estimating potential new conservation water added to the ground water system from urban run-off capture.
Castaic Lake Water Agency: Santa Clara River Valley Salt and Nutrient Management Plan Brian led efforts to determine ambient water quality conditions and develop a plan to confirm that water management practices were consistent with the agency’s water quality objectives. The completed plan provided a framework to protect groundwater and improve groundwater resource sustainability. Brian led our team to develop a monitoring plan, and evaluate the effect that proposed projects would have on groundwater quality.
Riverside County: Hydrogeologic Evaluation of the Riverside Aquifer Storage and Recovery Project
Brian identified available Santa Ana River surface flows to use in On-Channel and Off-Channel recharge basins and evaluated recharge impacts on the ground water surface.
Riverside County: Evaluation of Potential Locations for Ground Water Recharge at the East and West Dam Sites, Diamond Valley Lake
Brian assessed water quality and water level trends and other considerations to evaluate impacts from proposed recharge scenarios.
San Bernardino Valley Municipal Water District: Recharge Investigation of the Yucaipa Groundwater Basin
Brian led efforts to complete a hydrogeologic investigation at eleven potential sites within the Yucaipa Groundwater Basin for potential artificial recharge. Recommendations for subsequent phases of investigation were provided for each site.
San Bernardino Valley Municipal Water District and Partners: Determination of the Usable Capacity and Safe Yield for each Sub-basin within the Yucaipa Basin Area Brian led efforts to reevaluate sub-basin boundaries in the Yucaipa Groundwater Basin to assess the “safe yield” and storage capacity of each sub-basin. He developed a watershed model of the Yucaipa Valley to determine water balance terms previously not calculated.
City of Moreno Valley: Groundwater Basin Assessment for the Box Springs Mutual Water Company Service Area Rezoning
Brian helped evaluate available long-term water supplies from the San Jacinto Groundwater Basin to support future City development plans.
City of Banning: Update of Safe Yield Estimates for the Banning Groundwater Storage Unit Brian assessed current data and re-evaluated safe yield estimates for the groundwater basin as a potential source of water supply for a proposed future development.
City of Banning: 2010 Urban Water Management Plan
Brian prepared the City of Banning 2010 Urban Water Management Plan (UWMP) to comply with the Urban Water Management Planning Act requiring urban water suppliers to assess the reliability of its water sources over a 20-year planning horizon considering normal, dry, and multiple-dry years.
Amendments to the UWMP since the 2005 UWMP include the Water Conservation Act of 2009 or 20x2020 Plan, to reduce per capita water use by 20% by December 31, 2020.
Brian Villalobos, PG, CHG, CEG
Principal Geohydrologist
gssiwater.com A-3
Years of Experience: 17
Years with Geoscience: 9
Education and Professional Registrations/Certifications:
6 BS, Geology, Cal Poly Pomona
6 BS, Biology, Cal Poly Pomona
6 MS Geology, Cal Poly Pomona
6 California Professional Geologist (No. 9580)
Logan has more than 17 years of professional experience on more than 30 municipal direct or alternative supply wells and has completed more than 75 well field assessments and groundwater studies. His experience includes many different types of projects, such as geohydrologic investigations, groundwater quality studies, artificial recharge projects, water well test drilling programs, sea water desalination programs, and the management and supervision of water well projects including: siting, design, aquifer pumping test analyses and well construction. He has managed numerous well projects including water supply wells, injection wells, and monitoring wells. He has performed various aquifer pump tests analyses and help developed water quality sampling protocols
including specialized depth specific sampling and analysis.
He is also part of a team developing new methodologies for collecting real time flow and water quality data for better and more accurate well design and quality control.
Summary of Experience:
West Valley Water District: Bunker Hill Well Siting
Evaluation (Ph. 1 & 2)
Logan led efforts to site a production well in an area near known plumes, other production wells, river channel, and a highly industrial populated area. He and his team used an inhouse GIS analysis tool to help locate potential sites suitable for up to two wells near their future mainline.
City of Huntington Beach: Well Site Evaluation (8 sites) Logan led a comprehensive geohydrological evaluation of multiple potential sites to identify the most suitable well site locations for the City of Huntington Beach. The evaluation carefully considered key factors that were weighted based on its importance, allowing the sites to be ranked systematically.
Logan also prepared preliminary designs and provided recommendations for well drilling and testing.
City of Oceanside: Groundwater Well Site Evaluation
Logan led efforts to conduct a thorough geohydrologic assessment evaluating the local aquifer systems, groundwater production potential, and water quality. Using a weighted ranking methodology based on 13 criteria, locations that maximized production potential while mitigating risks related to environmental hazards and land use constraints were identified and prioritized. Refined from an initial preliminary site selection process to seven locations, each were assessed against multiple criteria including groundwater availability, potential interference with existing wells, and environmental considerations.
City of Santa Monica: Well Rehabilitation and Replacement Priority Evaluation Logan led a team to evaluate the current condition of wells and provide recommendations for Logan Wicks, PG
Senior Geohydrologist / Deputy Client Manager
6 More than a decade of
experience supporting the
design of municipal supply
wells
6 Experience and familiarity
with groundwater
production and monitoring
well installation—
helping to maximize well
production and efficiency
6 Proficient in interpreting
well pump tests and well
productions analyses, and
troubleshooting drilling
issues
KEY QUALIFICATIONS...
gssiwater.com A-4
their systematic rehabilitation or replacement for the City of Santa Monica. The evaluation assessed 14 groundwater extraction wells using a fifteenth destroyed well to test and calibrate the scoring and ranking matrix designed to identify wells that are most in need of immediate attention, while also providing a framework for future well maintenance and replacement planning. Logan’s team developed well-specific recommendations for rehabilitation for five wells based on the available data, the results of the scoring and ranking matrix, and City plans.
Yucaipa Valley Water District: Aquifer Storage & Recovery Wells (Injection/Recovery Wells) Logan is leading a team in the design and development of three new injection wells and two new recovery wells for the Oak Valley Town Center Recharge Project.
City of Anaheim Public Utilities: Four Well Condition Assessment & Rehabilitation Logan is supervising a team responsible for conducting a well condition assessment for APUC Well Nos. 39, 47, 48, and 53 to evaluate their current operational status and recommend necessary rehabilitation measures. Based on the findings, a comprehensive rehabilitation program was recommended for all wells, with multiple video inspections and post-rehabilitation aquifer testing, and a long-term maintenance and monitoring program. The team is currently preparing bid documents and technical specifications for rehabilitation and redevelopment efforts for the four wells.
Camrosa Water District: University Well Rehabilitation
Logan managed a team to assess the condition of University Well, develop a rehabilitation work plan, and provide field services during the testing and rehabilitation of the well. The team provided datat review, conducted a step drawdown pumping test, and performed a video survey after a pump failure and developed a rehabilitation program, which consisted of both a mechanical and chemical component.
City of Whittier: Well No 8 Rehabilitation and Relining Logan is managing a team that provided hydrogeologic services, performed/supervised well rehabilitation efforts, and is currently supervising the installation of a casing liner and the equipping of the submersible pump. Logan and his team provided updates and revisions to the technical specifications, field supervision of the contractor’s activities, and permitting support that included preparation of updated final DWSAP documents.
CADIZ, Inc.: Six New Irrigation Wells
Logan was the Field manager for the drilling, construction, development, and testing of six new high-capacity irrigation wells for Cadiz, Inc. as part of their new hemp and alfalfa growing operation.
Tasks involved with this project included developing preliminary well designs, technical plans and specifications, providing bid assistance, construction management service, aquifer pump test analysis, and final reporting. at the conclusion of the project, all six wells exceed client expectations and far and away the best producing well on any of their properties.
City of Oceanside: Pure Water Injection, Monitoring Wells, and Tracer Study Logan was field manager for the City of Oceanside Pure Water Project that involved the drilling and construction of three new injection water and 2 new monitoring wells. This indirect potable reuse (IPR) project involves injection of 3,360 acre-ft/yr (3MGD) of treated recycled water into the three injection wells. The water will be captured by the existing well field down gradient and surrounding the treatment facility. All three injection wells outperformed City and engineers’ expectations and are currently in operation today. Logan is also project manager for the Tracer Study for the City.
He developed the tracer study Workplan that was approved by DDW. He also helps develop the specialized equipment to super saturate a side stream of the advanced treated water with an SF6 tracer to be then injected back in as a slug of tracer. He then helped develop the sampling protocol and specialized equipment to sample and test for the tracer in the down gradient monitoring wells at varying frequencies.
Logan Wicks, PG
Senior Geohydrologist
gssiwater.com A-5
City of Lakewood: New Well No. 28 Design and Technical Specifications Logan helped lead efforts to develop the technical specifications for the City of Lakewood Well 28 Project. He drafted the preliminary design and construction sheets for the design phase.
City of South Pasadena: Rehabilitation of Wilson Well #2 Logan reviewed and evaluated video survey, production and pumping performance, hydrographs, water quality data, and side wall scraping results for Wilson Well #2. He helped prepare technical specifications for well rehabilitation, which included: cleaning of well casing and screen by brushing, applying dispersing agents, airlifting and swabbing, pumping and surging, aquifer pump tests, flowmeter survey, post-development video survey, and final well disinfection.
West Valley Water District: Sentinel Well 1 Construction Logan performed site field supervision, field work, on site supervision during reaming, caliper logging, casing installation, and assisted with NPDES discharge requirements.
City of Oceanside: Indirect Potable Reuse Feasibility Study Logan provided technical support on a project that evaluated the best locations for both injection and surface spreading (basin infiltration). Phase I work included background data research and groundwater model update and recalibration. Phase II involved validation of the updated model by conducting a field study involving drilling three sonic boreholes, hydropunch water quality sampling, running geophysical logs in each borehole and backfilling. The boreholes were sited in locations of data gaps and to evaluate alluvial and aquitard thickness, K-values of the aquifer, and groundwater quality. Phase II also included various geophysical resistivity surveys along areas where drilling would be difficult to do. These resistivity surveys were then correlated to the boreholes and used for another model update. Phase III used the fully updated model to run various scenarios for the best location and type of recharge in the basin (spreading or injection). This work lead to the City of Oceanside receiving a grant to design and construct three new injection wells for their IPR project Pure Water Oceanside currently in Design Phase.
Orange County Water District: Los Alamitos Barrier Improvement Project Logan was part of a team of hydrogeologists responsible for full time observation of conductor borehole drilling, conductor casing install, pilot borehole drilling, geophysical logging, and casing install of injection wells and monitoring wells. The project consists of 17 injection wells, four clustered monitoring wells, and two piezometers. Logan was also responsible for contacting OCWD, Jensen Drilling and Mahaffey while drilling.
City of Oceanside: USBR Grant Feasibility Study for New Extraction Wells Logan managed a team of our modelers for a feasibility study that evaluated the best locations for new extraction wells for the City’s desalter facility. Using the current model Logan and team ran various scenarios for the best locations for up to three new wells to help bring their desalter facility to near full capacity. His work with this study lead to the City receiving a grant to design and construct up to three new extraction wells.
Elsinore Valley Municipal Water District: Multiple Projects As part of an on-call contract, Logan led field efforts to rehabilitate six existing wells ranging in depth from 105 ft to 1,700 ft. Our team performed an initial site assessment, developed well designs, and oversaw production well construction.
Rancho California Water District: Replacement of Nine Municipal Wells Logan assisted in leading efforts to prepare large reports and plans to install nine new production wells that would replace failing supply wells. Since 2013, eight wells have been completed, one was abandoned due to water quality issues, the last two were completed early 2019. Our team provided well design, technical specifications, and helped the assigned district engineer to prepare bid packages. Our drilling phase work included zone testing, data analysis, and preparing multiple design options for water quality and production rates.
Logan Wicks, PG
Senior Geohydrologist
gssiwater.com A-6
Imperial Irrigation District: Monitoring Wells 1 & 2
Logan provided onsite well construction observation and data analysis. He helped develop the final well design, pump design and water quality analysis.
Chino Basin Desalter Authority: CDA Monitoring Well
Logan oversaw technical specifications, drilling, construction, design, development, and testing of 500-foot deep, monitoring well. The well will be used to monitor groundwater quality for a near-by treatment facility well field.
City of Huntington Beach: Well 1 Replacement
Logan performed well destruction and replacement for the City of Huntington Beach. He supported design efforts for well casing, screen, filter pack, and annular seal. During construction, he attended field meetings and worked with the contractor to inspect conductor bore hole drilling, casing installation, and the sanitary seal. He also sampled and logged soil cuttings, inspected aquifer zone testing for yield and water quality, and performed mechanical grading analyses. Once constructed, Logan inspected final development by pumping and surging and aquifer pumping tests.
Pico Water District: Well Number 11
Logan oversaw efforts to drafted technical plans and specifications, perform contractor bid assistance, and support permitting with regulatory agencies. Site selection for the project was challenging because of economic feasibility considerations. Working with the district Logan and our team successfully found solutions to integrate the new well into the existing system and meet the project completion dates and production goals set for early 2018.
Bellflower-Somerset Mutual Water Company: Leahy Avenue Well Due to permitting issues this project was delayed for several years, Logan helped manage schedule and budget to get the project back on track and completed. The project successfully met the new schedule and budget and produces more than 3,500 gpm, with a specific capacity of 60 gpm/ft— meeting and surpassing project goals.
Olivenhain Municipal Water District: San Dieguito Valley Brackish Groundwater Desalination Study
Logan supported modeling efforts to study brackish groundwater desalination feasibility and location.
He helped collect data, complete a hydrogeologic investigation, and performed well field and raw water collection. He also led efforts to drill construct and test a test supply well for the study. Due to the area and nearby residents, construction was difficult. He acted and supported the District in efforts to talk to the community and answer any and all questions they may have. He also designed a Noise Mitigation Program for the construction activities to comply with local noise ordnance to help keep the project on schedule and budget.
West Valley Water District: Quarterly Depth Specific Sampling Logan procured and developed depth specific Snap Samplers in three (3) WVWD Wells. He then provided on site supervision for depth specific sampling and water quality analysis.
Logan Wicks, PG
Senior Geohydrologist
gssiwater.com A-7
Years of Experience: 29
Years with Geoscience: 11
Education and Professional Registrations/
Certifications:
6 BS, Geology, University of Colorado, Boulder
6 MS, Civil Engineering, University of Southern California 6 PhD, Civil Engineering, University of California
6 California Professional Civil Engineer (No. 68138)
For nearly 30 years, Dr. Mark Williams has focused on
municipal water quality. Dr. Williams has served in various capacities in numerous studies focusing on water quality investigations and oversees the Quality Assurance procedures and practices for all of Geoscience water quality investigations.
Dr. Williams served as an Engineer for eight years in the Water Quality Division of the Metropolitan Water District of Southern California, where he was involved in Metropolitan’s Desalination Research Innovation Partnership to manage
inland desalination, and worked on a range of water quality projects including studies on nitrates, NDMA, perchlorate, and bromate in municipal water supplies.
Water Quality Investigations:
Dr. Williams has served in various capacities in numerous studies focusing on water quality investigations. He has served as a project engineer in a study on perchlorate removal study; the study focused on measuring the efficacy of commerciallyavailable ion exchange resins for removing perchlorate. In another study, Dr. Williams served as the principal investigator on a study testing perchlorate removal in biological reactors.
He has served as the project engineer for a study to evaluate parameters controlling bromate formation during ozonation. The study determined the effects of seasonal water quality changes, particularly changes in organic carbon, on bromate formation. The study involved design and construction of a small pilot ozone reactor to model the hydrodynamics of a full-scale ozone contactor.
In another study, he served as project engineer to evaluate operating strategies for lowering bromate formation. The study involved demonstration-scale evaluations of bromate control strategies, which included pH control, adding ammonia, and staging ozone dose across the contactor. Outcomes of this study were used as basis for design and operation of Metropolitan’s full-scale ozone facilities. The study demonstrated that ammonia was an effective bromate control strategy; however, it is highly dependent on source water quality. The study was partially funded by the Environmental Power and Research Institute (EPRI).
Dr. Williams was the project engineer for a study to determine the efficacy of ozone and chlorine dioxide for inactivating Cryptosporidium. The four-year study evaluated variables, such as temperature and dissolved organic levels, which influence inactivation of Cryptosporidium and other pathogens.
The study involved: (1) design and construction of a variety of reactors to model hydrodynamics of different processes, (2) developing testing protocols, and (3) developing inactivation models based on measured data and reactor hydrodynamics. The study was partially funded by the American Water Mark Williams, PhD, PE
Principal Engineer / Technical Advisor & QA/QC Review
6 Nearly three decades of
experience, specializing in
municipal water quality
6 Experienced investigator
for water quality
contamination, focusing on
nitrates, NDMA, perchlorate,
and bromate in municipal
water supplies
6 Oversees all Quality
Assurance procedures
and practices for staff on
water quality investigation
projects
KEY QUALIFICATIONS...
gssiwater.com A-8
Works Association Research Foundation (AWWARF).
Summary of Experience:
Rancho California Water District: VDC Recharge Basin Pilot Testing As the Project Manager, Dr. Williams was responsible for pilot testing of recharge facilities at RCWD for health department permitting compliance. Conducted tracer testing and virus removal testing to determine ground water residence times and log-removal credit for artificial recharge basins.
Shallow Ground Water Quality in the Vicinity of Mills Treatment Plant Dr. Williams provided technical support and expert opinion in litigation on shallow groundwater and impacts from nearby septic tanks based on levels of endocrine disrupting compounds found in groundwater.
Rancho California Water District: Lower VDC Recharge Test Plan Dr. Williams was responsible for the development of preliminary test plant for recycled water recharge in the lower VDC area, which established methods for tracer testing procedures to establish horizontal and vertical ground water travels times.
San Bernardino Valley Municipal Water District: Impacts of imported water on Basin Objectives
Dr. Williams established impacts of recharging east-branch State Project water on salinity basin objectives in the San Bernardino area.
Metropolitan Water District: Seasonal Water Quality Effects of State Project Water on Disinfection By-Products
As the Project Manager, Dr. Williams was responsible for evaluating the seasonal effects of water quality on forming chlorine by-products in Organics in east-branch state project water and Colorado River Water imported water supplies.
Professional Memberships / Registrations:
6 American Chemical Society
6 American Institute of Chemical Engineers
6 Peer Reviewer – Ozone Science and Engineering
6 Peer Reviewer – Journal of Environmental Engineering
6 Peer Reviewer – American Water Works Association
6 Peer Reviewer – National Science Foundation
6 Project Advisory Committee Member – American Water Works Research Foundation: Zero Liquid Discharge
6 Technical Advisory Committee Member – American Water Works Research Foundation:
Desalination Product Water Recovery
6 Project Advisory Committee Member – American Water Works Research Foundation: Strategies for Removing Bromide
Mark Williams, PhD, PE
Principal Engineer
gssiwater.com A-9
Years of Experience: 34
Years with Geoscience: 34
Education and Professional Registrations/Certifications:
6 BS, Geology, National Taiwan University
6 MS, Geology, National Taiwan University
6 PhD, Sedimentology, University of Southern California 6 California Professional Geologist (No. 6371)
6 California Certified Hydrogeologist (No. 422)
For nearly 35 years, Johnson has managed groundwater
modeling efforts, hydrogeologic investigations, groundwater basin and water quality studies, and artificial recharge projects. Johnson performs detailed statistical analysis of various types of data and has been the lead modeler on
many high-profile projects—in fact, he was instrumental in helping to resolve one of the largest groundwater rights cases in California and developed models that helped a water district client successfully avoid a costly litigation. Johnson also taught a graduate level groundwater modeling course at the University of Southern California and his experience and knowledge enables him to develop detailed and thorough
groundwater models that will help inform future groundwater management strategies and decisions. Johnson has also worked extensively with MODFLOW and has been helping the USGS beta-test GSFLOW, a combined surface and groundwater model based on MODFLOW and PRMS.
Specific Project Experience:
Searles Valley Minerals: Indian Wells Valley Groundwater Basin Adjudication Johnson is the technical lead for Geoscience’s involvement in the Indian Wells Valley Technical Working Group. The group has worked collaboratively to evaluate basin conditions, groundwater storage, pumping , and a technically defensible estimate of safe yield to support sustainable basin management.
California American Water: Monterey Peninsula Water Supply Project (MPWSP) The purpose of the Monterey Peninsula Water Supply Project (MPWSP) is to relieve the pressure on the local municipal water supply aquifer, and create new, local water supplies by providing desalinated water to northern Monterey County. The MPWSP will also help reduce and remediate seawater intrusion from overdraft conditions, which has been an ongoing water quality issue since the 1930s. Since the start of the project in 2008, Johnson and Geoscience have provided various services including the hydrogeologic characterization of the area, groundwater model development and modeling to create the aquifer testing program, a gap analysis, and exploratory drilling. Johnson was the lead modeler and led the efforts to update the three-dimensional variable density flow and solute transport model for the North Marina Area in 2008 and constructed a focused groundwater model near the CEMEX gravel plant in Marina, CA (NMGWM). Johnson is currently serving as a technical expert for Cal-Am during the City of Marina v. RMC Lonestar lawsuit against the MPWSP. The case has been referred to the California State Water Resources Control Board Administrative Hearings Office.
During this process, Johnson has worked collaboratively with other Cal-Am experts to develop a series of expert reports and has led the development of a steady state groundwater flow and solute Johnson Yeh, PhD, PG, CHG
Principal Modeler
6 Specializes in watershed
and groundwater modeling
6 Assists USGS in testing
GSFLOW model code
- helping to keep
groundwater models up-todate
6 Experience supporting
more than 30 groundwaterrelated litigation cases
KEY QUALIFICATIONS...
gssiwater.com A-10
transport model to answer specific questions posed by the Administrative Hearings Officer and has provided testimony at multiple hearings. He is also supporting final slant well planning for the MPWSP through model analysis.
Western Municipal Water District: Riverside-Arlington Basin Groundwater Sustainability Plan
Johnson oversaw modeling efforts to develop a GSP for the Riverside-Arlington Basin. The Basin is classified by DWR as a low priority basin and is one of the District’s primary sources of local water supply. Johnson worked in conjunction with our team and the District to complete all models necessary to complete a compliant GSP.
Calleguas Municipal Water District: Las Posas Valley Groundwater Basin Adjudication Johnson was the lead technical support for Geoscience’s collaborative participation in the Las Posas Valley adjudication, which focused on the evaluation of the basin’s safe yield.
Yucaipa Valley Water District: Recycled Water Use Evaluation using the Gateway Sub-basin Focused Groundwater Model
Johnson was the senior modeler overseeing the construction of a groundwater model used to predict the impacts of recycled water spreading on groundwater quality and to downstream municipal wells.
San Bernardino Valley Municipal Water District: Santa Ana River Integrated Model Johnson led our team in an effort to use existing groundwater and surface water models to develop an integrated groundwater model using MODFLOW for the upper Santa Ana River. The resulting Upper SAR Integrated Model (or Integrated SAR Model) was used to determine what factors may contribute to declines in SAR flows, and assess cumulative effects on SAR surface flows and groundwater levels.
Los Angeles County Public Works: Antelope Valley Groundwater Basin Adjudication Johnson was the lead technical support for Geoscience’s participation in Phases 2 through 4 of the Antelope Valley adjudication. Using a USGS MODFLOW model, Johnson analyzed water level elevations and flow vectors in selected years, quantified groundwater underflow from the West Antelope Subbasin to the Lancaster Subbasin and evaluated the impacts of no-flow from the West Antelope area. Subsequently, he updated and recalibrated the model to correct technical deficiencies found during review. Johnson then used the updated model to verify estimates of safe yield, support the development of a physical solution, and evaluate the effect of outside pumping on recharge in the basin.
Santa Ana Watershed Project Authority: Santa Ana River Waste Load Allocation Model Update
Johnson led efforts to update the Santa Ana River Waste Load Allocation Model, which is used by multiple agencies to assess water quality throughout the watershed. Model scenarios and assumptions were developed as part of the effort to estimate the projected total dissolved solids and nitrate-N concentrations of the Santa Ana River recharge water and discharge at Prado Dam. Once completed, Johnson oversaw the waste load allocation scenario runs and evaluations for major stream segments in the watershed.
Elsinore Valley Municipal Water District: Hydrogeological Investigation of the Warm Springs Subbasin
Johnson led groundwater modeling efforts to complete a hydrogeologic investigation of the Warm Springs Subbasin. The modeling was used to help quantify the groundwater storage and safe yield of the Warm Springs Subbasin and estimate yield for future municipal supply wells.
City of Pismo Beach/WSC Inc.: Regional Groundwater Sustainability Project (RGSP) The RGSP is a regional recycled water project that will help reduce the risk of seawater intrusion and help improve sustainability for the region’s water supply. Johnson led efforts to evaluate existing characterization studies, groundwater models, and water quality data. He also constructed and calibrated an expanded MODFLOW groundwater model to evaluate injection and extracting scenarios Johnson Yeh, PhD, PG, CHG
Principal Modeler
gssiwater.com A-11
and conduct an anti-degradation analysis. He is continuing to support the project by running predictive model scenarios.
Rancho California Water District: Surface and Ground Water Model of the Murrieta-Temecula Ground Water Basin
Johnson was the lead modeler to create an Integrated Ground Water and Streamflow Model. Johnson worked with a technical panel that included, RCWD, USGS, U.S. Marines, Camp Pendleton, Stetson Engineers, Santa Margarita Watermaster, and Geoscience. The technical was formed to avoid litigation between RCWD and the Camp Pendleton Marine Base. Johnson is responsible for preparation of the model and analysis of the results.
City of Oceanside: Mission Basin Model Update and Evaluation of Indirect Potable Reuse Johnson oversaw efforts to update and refine a groundwater model used to predict the impacts of recycled water spreading and injection on groundwater quality and to downstream municipal wells. In addition, the updated model was used to evaluate the impacts on threshold water levels in the Mission Basin to stay within permit constraints
San Bernardino Valley Municipal Water District: SBBA Flow Model Update for Artificial Recharge
Johnson updated the SBBA Refined Basin Flow Model and quantified the maximum amount of artificial recharge the SBBA could accept in water year 2012.
Brownstein Hyatt Farber Schreck, LLP: Cadiz Groundwater Conservation and Storage Project Phase I
Johnson ran conservation scenarios and helped draft a technical memo outlining the detailed scenarios run with the Cadiz model for their storage project near the Mojave Desert.
City of Riverside: Colton Soil Safe Project
Johnson provided comments on the EastStar Ground Water Model used for the Colton Soil Safe Project.
West Basin Municipal Water District: West Coast Basin Barrier Project Model Update, Addendum and Project Engineering
Johnson provided updates to the groundwater model for the West Coast Basin Barrier Project (LARWQCB Order. No. R4 2006 0069). In addition, the project included the drafting of an addendum to the 2010 Model Update Report and the engineering of the injection wells for the project.
Terra-Gen Power, LLC: DBS&A Revised GW Flow Model
Johnson provided comments on the DBS&A Revised Groundwater Flow Model.
Western Municipal Water District: Impact of Recharge on Contaminant Plumes and Modeling Johnson was the project manager and lead ground water modeler to assess and model the area around the Riverside-Corona Feeder, to show the potential future impact of an initial operation scenario on the ground water levels and ground water quality in the San Bernardino Basin Area.
City of Riverside: Groundwater Monitoring for Flume 7 Well Impacts Johnson provided groundwater monitoring results for the evaluation of impacts from pumping the proposed Flume 7 well.
Raymond Basin Management Board: Predictive Groundwater Modeling for Potential Storage Johnson provided updated results of predictive ground water modeling for the Pasadena Groundwater Storage Program in the Raymond Basin.
Western Municipal Water District / City of Ontario / Jurupa Community Services District:
Preliminary Drinking Water Source Assessment
Johnson was responsible for preparing a preliminary drinking water source assessment and protection documents for the CDA Wells I-16 and I-18 in the Chino Basin.
Western Municipal Water District: Groundwater Modeling
Johnson Yeh, PhD, PG, CHG
Principal Modeler
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Johnson was responsible for the groundwater modeling of Riverside-Corona Feeder Project Conjunctive Use Scenarios in San Bernardino Valley.
West Basin Municipal Water District: Groundwater Modeling Johnson was involved in the production of a 2008 Model Update Report for the West Coast Basin Barrier Project.
U.S. Army Corps of Engineers: Groundwater Modeling
Johnson developed a ground water flow model modification for the San Bernardino Lake and Streams Feasibility Study.
Marina Coast Water District: Groundwater Modeling Scenario 4f Johnson conducted a North Marina Groundwater Model Evaluation of Regional Project Scenario 4f.
City of San Juan Capistrano: Local Water Supply Analysis Johnson assisted in providing the City of San Juan Capistrano with a local water supply analysis.
Atascadero Mutual Water Company / City of Atascadero: Groundwater Flow & Transport Modeling
Johnson was responsible for the development of a ground water flow and solute transport model for a portion of the Atascadero Subbasin.
San Bernardino Valley Municipal Water District: Remediation Strategies for Ground Water Contamination
Johnson was the project manager and lead ground water modeler to refine previous USGS models to better understand, analyze, and evaluate remediation alternatives related to ground water contamination problems.
Chino Basin Desalter Authority: Chino Desalter System Projects Johnson developed a detailed analysis of the Chino Ground Water Basin that included a threedimensional numerical ground water flow model (MODFLOW). A separate analysis was also conducted to assess potential water quality changes in project and existing wells as a result of the project.
San Bernardino Valley Municipal Water District: Groundwater Modeling and Regional Water Management Plan
Johnson assisted in the production of a San Bernardino Basin Area Groundwater Model 2009 Regional Water Management Plan.
Municipal Water District of Orange County: Subsurface Intake Feasibility Assessment Johnson assisted in preparing a subsurface intake feasibility assessment for Task 3 for the proposed Dana Point Desalination Facility.
Western Municipal Water District: Groundwater Modeling
Johnson prepared a ground water flow conceptual model for the Murrieta Valley area to determine conjunctive use scenarios.
SunCal Companies: CIM Wellfield Impact Evaluation
Johnson was responsible for the evaluation of potential impacts to the CIM Well Field from operation of the Eucalyptus Park Well - College Park Project in Chino, CA.
RBF Consulting and Vista Serena: Groundwater Well Pumping Evaluation Johnson analyzed potential ground water drawdown from proposed production wells located on Santa Maria Beach in Cabo San Lucas, Mexico.
Raymond Basin Management Board: Groundwater Modeling
Johnson provided results of predictive ground water modeling for the Pasadena Groundwater Storage Program in the Raymond Basin.
Johnson Yeh, PhD, PG, CHG
Principal Modeler
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Education and Professional Registrations/Certifications:
6 BS, Hydrology and Water Resources University of Arizona 6 M.Eng., Civil and Environmental Engineering,
Massachusetts Institute of Technology
David has more than 15 years of experience performing
groundwater modeling and studies for several municipal
clients and public agencies, specializing in the development of groundwater and hydrogeologic models, as well as data processing and GIS to support modeling efforts. Additionally, David is experienced in well design and construction
processes with wide-ranging experience in field hydrology, aquifer testing, and characterization methods. His experience has included assisting in the development of a regional groundwater model to support a Habitat Conservation
Plan, where he assessed the impacts of water management decisions on shallow groundwater, streamflow and riparian areas. David’s experience also includes a geohydrologic analysis of future groundwater production, assessing the future proposed pumping operations for a municipal wellfield.
To complete the assessment, he developed a local groundwater flow model and also developed a solute transport model to assess water quality in the wellfield.
Summary of Experience:
South Coast Water District (GHD): Geophysical Survey and Subsurface Intake Design at Doheny Beach
David updated a groundwater model using results from a geophysical survey and mapping of the coastal aquifer. He then assessed the feasibility and performance of various subsurface intakes designs including simulating subsurface intake influent water quality in various configurations using a solute transport model.
City of Pismo Beach/WSC Inc.: Regional Groundwater Sustainability Project (RGSP) The RGSP is a regional recycled water project that will help reduce the risk of seawater intrusion and help improve sustainability for the region’s water supply. David is assisting in evaluating existing characterization studies, groundwater models, and water quality data. He is also assisting in the development and calibration of an expanded MODFLOW groundwater model to evaluate injection and extracting scenarios and conduct an anti-degradation analysis.
City of Oceanside, Pure Water Oceanside Tracer Study
David provided modeling services for the Pure Water Oceanside Tracer Study for the City. He assisted in the development of the tracer study workplan and provided groundwater modeling scenarios that tracked a supersaturated side stream of advanced treated water with an SF6 tracer that was injected back into the groundwater and then sampled and tested for in the down gradient monitoring wells at varying frequencies.
San Bernardino Valley Municipal Water District: Integrated Santa Ana River Model David helped develop a regional groundwater model to support a Habitat Conservation Plan in the Upper Santa Ana River Basin. He assessed the impacts of water management decisions on shallow Years of Experience: 16
Years with Geoscience: 8
David Barnes, MEng
Senior Modeler
6 More than a decade of
experience with watershed
and groundwater modeling,
groundwater studies,
and well design and
construction—helping
to identify and address
potential issues in the field
during construction
KEY QUALIFICATIONS...
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groundwater, streamflow and riparian areas. David also presented key results and coordinated with stakeholders and members of the project’s technical advisory committee.
Jurupa Community Services District: Geohydrologic Analysis of Future Groundwater Production
David assessed future proposed pumping operations for a municipal wellfield. To complete the assessment, he developed a local groundwater flow model for Chino Basin using the larger regional Integrated Santa Ana River Model. David also developed a solute transport model to assess water quality including Total Dissolved Solids and nitrate in the wellfield.
Western Municipal Water District: Arlington Basin Groundwater Sustainability Plan David constructed a groundwater model, analyzed historic and current water budgets, and assessed the basin’s sustainable yield. He then prepared report on findings to include in the basin’s Groundwater Sustainability Plan.
San Bernardino Valley Municipal Water District: Big Bear Overflow Modeling and Assessment
David oversaw the development of a watershed model for the Seven Oaks Watershed to assess the affect of the Replenish Big Bear project on recharge activities in the lower watershed. David also prepared reports and presented key findings.
San Bernardino Valley Municipal Water District: Evaluate Recharge Capacity of Wildwood Creek Basins
David developed a groundwater model to assess the operations of a stormwater recharge basin project. He also prepared reports and gave a presentation to stakeholders on the facility’s performance and operation.
Kingdom of Saudi Arabia: Detailed Study of the Western Coastal Plain* David developed basin-scale hydrologic models for thirty nine basins in Saudi Arabia. Gathered meteorologic data, delineated basins, constructed a database, performed statistical analysis of basin meteorology/hydrology. Utilized remotely-sensed rainfall data from NASA’s Tropical Rainfall.
Measurement Mission.* Developed customized programs (shell, Fortran) to integrate HEC-HMS hydrologic models with MODFLOW groundwater models. Developed HECRAS hydraulic models.
Developed regional groundwater models. Prepared hydrologic, hydraulic and groundwater models and prepared reports.
Big Cypress Seminole Indian Reservation: Surface Water/ Groundwater Interaction Study* David analyzed hydrologic data from monitoring wells, piezometers, weirs and control structures.
Developed a site water budget and assessed interaction of surface water and groundwater. Prepared report summarizing site hydrology.
Lee County: Groundwater Flow Modeling to Support Land Use Permitting* David developed MODFLOW models for a number of proposed mines in Lee County to assess the influence of shallow excavation in the surficial aquifer on the water budget and on groundwater levels in the area. Developed utility programs to edit model files and process results binaries. Prepared modeling reports.
City of Hialeah: RO Deep Injection Well and Production Well Construction* David supervised the simultaneous drilling of two 3500 ft. deep Class I injection wells and a dual-zone monitor well. Provided construction oversight during drilling of eight Floridan Aquifer production wells for raw water supply. Sampled cuttings, described lithology, performed core sampling and description, packer testing, injection testing, report writing, and ensured compliance with the FDEP permit conditions. Analyzed packer and injection test data for characterization of aquifer properties.
City of Cape Coral: Injection Well Construction*
David supervised the drilling of an additional deep Class I injection well at the City of Cape Coral David Barnes, MEng
Senior Modeler
gssiwater.com A-15
Southwest Water Treatment Plant. Provided construction oversight during drilling. Sampled cuttings, described lithology, performed core sampling and description, packer testing, injection testing, report writing, and ensured compliance with the FDEP permit conditions. *Projects prior to Geoscience
David Barnes, MEng
Senior Modeler
gssiwater.com A-16
Years of Experience: 10
Years with Geoscience: 4
Education and Professional Registrations/Certifications:
6 BS, Environmental Engineering, Shanghai University
6 MS, Environmental Engineering, University of Southern California
6 California Professional Engineer (No. 94372)
Tim has nearly a decade of experience with groundwater
and environmental investigations performed for numerous municipalities, state agencies, and private clients throughout the Southern California region. Tim has supported and led projects involving groundwater flow and solute transport modeling, geohydrologic investigations, ground water
basin and water quality studies, watershed modeling and management, and artificial recharge projects. Tim also
has experience in well equipping design, developing GIS applications, and project management.
Summary of Experience:
City of Riverside: Recharge Modeling
Tim analyzed the exceedance probability for characterized flows at Rubber Dam using USGS 15 min, daily, and watershed model data. He ran and analyzed the HSPF watershed model and water balance which included recharge and discharge components under no project, and project conditions. Tim then calculated source water percentage contributions
to surface water at the MWD crossing, and analyzed HSPF watershed simulated outflow result to prepare input data for the Groundwater Flow Model.
Chino Basin Desalter Authority: Chino Basin Well Siting Study Tim helped update and calibrate a historical groundwater flow model and a solute transport model.
He also developed and ran predictive runs, analyzed the modeling results, and developed the final modeling report.
Elsinore Valley Municipal Water District: Hydrogeological Investigation of the Warm Springs Subbasin
Tim supported groundwater modeling efforts to complete a hydrogeologic investigation of the Warm Springs Subbasin. The modeling was used to help quantify the groundwater storage and safe yield of the Warm Springs Subbasin and estimate yield for future municipal supply well.
San Bernardino Valley Municipal Water District: Yucaipa Safe Yield Study Tim helped revise the Yucaipa groundwater basin and sub-basin boundary based on groundwater level and fault information using GIS software. He calculated specific yield and storage capacity of each sub-basin for 1991 and 2008 and built the HSPF watershed model for Yucaipa watershed area based on 2005 land use. Tim also ran the HSPF watershed model, analyzed water balance, and the historical groundwater storage change for the Yucaipa basin area.
City of San Bernardino: US EPA Model
Tim collected land use data for 1963, 1975, 1984 and 2005 in the San Bernardino Basin Area (SBBA) Tim Chen, PE
Senior Modeler
6 Well design and
groundwater modeling
experience—increasing
project efficiency
6 Experience with water
supply, injection, banking,
and monitoring wells—
helping to identify and
resolve project issues
6 Experienced in
conducting environmental
investigations—helping
to identify and mitigate
constituents of concern
during well design
KEY QUALIFICATIONS...
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area using GIS software. He then prepared the SBBA HSPF watershed model input data including land use, precipitation, evapotranspiration, and channel type data. Finally, Tim helped build and calibrate SBBA watershed models for the period of 1962 – 1972 and 1979 – 2012.
West Coast Basin Barrier Project: West Basin 2012 Groundwater Modeling Tim updated Groundwater Flow Model input packages to incorporate recharge and discharge components (i.e., flux terms) measured from January 2012 through December 2012. He then helped calibrate the Groundwater Flow Model based on groundwater levels and transient conditions from Jan 1970 through Dec 2012. Tim then helped calibrate the existing solute transport model based on chloride concentration from seawater intrusion and evaluated seawater intrusion migration conditions and water quality based on groundwater model output files using GIS software.
San Luis Obispo County: Paso Robles Groundwater Basin Model Update Tim helped develop and calibrate a HSPF Watershed Model for the period of 1981 through 2011.
Tim updated and recalibrated the Groundwater Flow Model using the results from the Paso Robles Watershed Model. He then helped develop and run predictive model runs for the period of 2012 through 2040. Finally, Tim analyzed the modeling results and wrote the modeling report.
Rancho California Water District: Water Audit for Fiscal Year 2020-2021 Every year, Geoscience helps the District determine the safe yield and groundwater production rates to sustainably manage the local groundwater basins. Tim supported the most recent Water Audit by assisting with modeling to determine safe yield numbers and groundwater rates.
Inyo County: Update of the Rose Valley Groundwater Flow Model and Simulation of Sensitivity Model Scenarios on Drought Conditions
Tim updated the model input packages and recalibrated the Rose Valley Groundwater Flow Model by analyzing the predictive groundwater reduction within a 10-year period. He helped run five different sensitivity model scenarios on drought conditions and helped prepare figures and tables for the final report.
San Bernardino Valley Municipal Water District: Prepare Second Report of Recharge Parties to RWQCB Pursuant to Cooperative Agreement
Tim helped collect and prepare groundwater model input files including updated groundwater levels and water quality data. He also ran the water balance and analysis for hydrologic budgets under 3 different water model scenarios.
Antelope Valley East Kern Water Agency (AVEK) Groundwater Bank Expansion* Tim supported efforts to expand the AVEK Eastside groundwater bank. The project increased the total groundwater recharge area to 68 acres, and installed four new groundwater pumping wells with a total capacity of 4,800 gpm to recover the additional artificial recharge.
Palmdale Water District: Palmdale Regional Groundwater Recharge and Recovery Project* Tim developed preliminary designs for a groundwater bank project providing 80 acres of recharge basins and 16 groundwater pumping wells for recovery. He also designed one monitoring well and one test well to evaluate aquifer properties and groundwater quality. *Projects prior to Geoscience
Tim Chen, PE
Senior Modeler
gssiwater.com A-18
Years of Experience: 40
Years with Geoscience: 1
Education and Professional Registrations/Certifications:
6 BS, Geology, Virginia Tech, Blacksburg, VA
6 MS, Hydrology, New Mexico Inst. of Mining and
Technology, Socorro, NM
6 MS, Computer Science, Mississippi State University
6 Long Term Training, Department of Civil and
Environmental Engineering, University of California at
Los Angeles (UCLA)
6 California Professional Geologist (No. 5957)
6 California Certified Hydrogeologist (No. 151)
6 Federal Secret Clearance (2015 - Present)
Stephen (Steve) Turnbull has 39 years of experience drilling and installing monitoring and production wells in a wide variety of different geologic formations in Hawaii, California, Arizona, and Nevada. Steve has performed a wide variety of surface water and groundwater assessments and hydrologic planning studies. He has 23 years of experience drilling in volcanic formations in Hawaii from 1991 to 2014. His projects have included the drilling and installation of 10 monitoring wells on Makua Military Reservation, Oahu, eight (8) monitoring wells on Schofield Army Barracks, Oahu, as well as providing technical guidance for the replacement of production water wells on Tripler Army Medical Center Oahu (2 municipal wells), Ft. Shafter Oahu (2 municipal wells), and Schofield Barracks Oahu (4 municipal wells). While as the Navy’s Red Hill Regional Program Director, he coordinated project efforts between regulatory agencies and a team
of over 70 Navy engineers and professionals that included an evaluation of groundwater impacts and the installation of 12 monitoring wells and four (4) production wells in basalt volcanic formations pumping 3,500 gallons per minute to remediate the Jet and Diesel fuel contamination.
Additional resources evaluation and assessments of both surface and groundwater include a Groundwater Under the Direct Influence of Surface Water (GWUDI) study in San Diego for the permitting of a water system, permitting of water system in Hawaii, and an evaluation of pumping impacts resulting from Border Wall Construction in Arizona.
Steve has also performed and supervised large field data collection efforts that included the installation of soil moisture sensors, meteorological weather stations, and streamflow measuring and automated stream sample collection equipment to evaluate surface water runoff and surface water sediment and nutrient (nitrogen, phosphorus) loads to meet National Pollutant Discharge Elimination System (NPDES) permit and total maximum daily load (TMDL) environmental regulation compliance.
Steven J. Turnbull, PG, CHG
Senior Geohydrologist
6 More than two decades of
experience in drilling and
installing production and
monitoring wells in volcanic
basalt formations
6 Extensive experience with
hydrothermal systems and
cold water aquifers
6 Experience in groundwater
resource evaluations for
artificial groundwater
recharge and reuse.
6 Experience with
Groundwater Under the
Direct Influence of Surface
Water (GWUDI) studies in
California.
6 More than 10 years of
experience meeting water
system regulatory permit
requirements.
KEY QUALIFICATIONS...
gssiwater.com A-19
Summary of Experience:
Mojave Water District: West Victorville Groundwater Banking Pilot Test Project For this project, Steve performed project management tasks coordinating four different subcontractors performing CEQA (California Environmental Policy Act) surveys and compliance, trenching and shallow soil characterization, design plans for an infiltration pond, and geophysical towed and fixed groundbased transient electromagnetic (TEM) surveys. Steve collected geologic and hydrologic data from the Mojave Water Agency, and performed a detailed analysis of the available data and prepared a Site Conceptual Model Technical Memorandum for guiding potential changes to the groundwater modeling used to evaluate the performance of an infiltration basin to recharge 14,000 ac-ft of groundwater taken as surplus flows from the California Aqueduct. This included the modification of seven geologic cross sections and creation of two additional cross sections for the Site Conceptual Model. Steve also performed an analysis of borehole geophysical electric log resistivity values to evaluate changes in geologic formations across the basin.
Metropolitan Water District: Brackish Groundwater Resource Study This project involved the development of an inventory of brackish groundwater resources for the Metropolitan Water District of Southern California and AECOM. The primary goal is to identify and evaluate potential brackish groundwater sources for desalination and use as a regional potable water supply within Metropolitan Water District’s service area. For this project, Geoscience reviewed U.S.
Geological Survey and State of California databases of groundwater salinity across Southern California, as well as our own Geoscience databases, and evaluate potential areas of brackish saline groundwater with TDS concentrations of less than 3,000 mg/l for development. The resulting study provided a list of groundwater basins across Southern California as having potential for development (GO), possibly having potential for development (Future Potential), and having no potential for development (No Go).
City of Santa Monica: Brackish Water Desalination Feasibility Study Geoscience performed a study evaluating the feasibility of pumping and treating brackish saline groundwater along the coast and in adjacent areas just inland of the coast. We reviewed the available reports such as the SGMA (Sustainable Groundwater Management Act) plan for Santa Monica, and all available documents on the management of groundwater resources, as wells as information from past U.S. Geological Survey and State of California reports, and databases. All of these available data were assembled to estimate the areas most likely to provide brackish saline water for development.
Cadiz, Inc.: Groundwater Management, Monitoring, and Mitigation Implementation Plan For this project, Steve assisted in creating the Cadiz Groundwater Management, Monitoring, and Mitigation Implementation Plan Addendum 1 to the original June 2012 plan for implementing the Cadiz Valley Groundwater Conservation, Recovery, and Storage Project (Project) in the Fenner, Orange Blossom Wash, Bristol, and Cadiz Watersheds in the Eastern Mojave Desert. The project area encompasses the Bristol, Cadiz, and Fenner Watersheds, collectively spanning about 2,320 square miles. This plan includes a summary of the project’s geology and hydrology. It includes the Monitoring Plan Design, rationale, management and mitigation strategy that includes evaluating and monitoring land subsidence, aquifer drawdown, groundwater brine migration, spring flows, air quality, and vegetation, as well as the number and placement of monitoring wells and production wells for the project. This project has one of the most extensive groundwater monitoring programs in California.
City of Anaheim Public Utilities: Four Well Condition Assessment & Rehabilitation Steve is part of the team responsible for conducting a well condition assessment for APUC Well Nos. 39, 47, 48, and 53 to evaluate their current operational status and recommend necessary rehabilitation measures. Based on the findings, a comprehensive rehabilitation program was recommended for all wells, with multiple video inspections and post-rehabilitation aquifer testing, and a long-term maintenance and monitoring program. The team is currently preparing bid documents and technical Steven J. Turnbull, PG, CHG
Senior Geohydrologist
gssiwater.com A-20
specifications for rehabilitation and redevelopment efforts for the four wells.
Municipal Water Well Replacement, Schofield Barracks, Ft. Shafter, and Tripler Army Medical Centers*
Steve provided hydrogeologic assistance for the installation of four (4) new replacement water wells at Schofield Barracks, and two (2) replacement wells at both Ft. Shafter and Tripler Army Medical Centers.
He also reviewed the contractor’s submittals for these eight (8) replacement wells.
Brownfield Customs and Border Patrol GWUDI Study and Water System Permitting* Steve prepared and implemented a sampling plan submitted to the State of California Resources Control Board’s Division of Drinking Water (DDW) on paired sampling of surface water and groundwater for a Groundwater Under the Direct Influence of Surface Water (GWUDI) study for a water well in Dulzura, CA. Steve has also assisted with preparing and submitting a Drinking Water Source Assessment and Protection (DWSAP) Program report to permit two (2) water wells as a non-transient, non-community water system in California. I installed and monitored two rain gages and two ISCO 6712 automated streamflow samplers to collect the field parameters (pH, electrical conductivity, turbidity, and temperature) from two storm events in 2023 (personnel from the Los Angeles District office collected three more storm events). On-going efforts include submitting the results to the California Water Board, with the goal of seeking approval to apply the groundwater treatment rules, instead of the surface water treatment rules, for permitting the water system.
Border Wall Hydrogeologic Evaluation, Southern Arizona* Steve researched and wrote two reports for Quitobaquito Spring/Pond, and the San Pedro Riparian National Conservation Area in Southern Arizona. These reports documented the impacts of groundwater withdrawal for Border Wall construction, with a focus on the impacts to existing groundwater receptors. The report documented that the groundwater withdrawal for Border Wall construction could not have impacted the groundwater receptors to the extent that environmental groups claimed.
Anuhea and HokuNui Water Systems Permitting*
Steve prepared regulatory documentation required by the State of Hawaii Department of Health (DOH) Safe Drinking Water Branch, the Department of Land and Natural Resources (DLNR) Engineering Division, and Maui County Hawaii. This documentation included the submitting and receiving approval for Engineering Reports for New Potable Water Sources required by the Hawaii Source Water Program (HISWAP) (note: this report is equivalent to a DWSAP in California).
White Sands Missile Range Regional Water Plan*
As part of a team of CHL research hydraulic engineers, Steve collected site information and assisted in preparing regional water plan for the Ft. Worth District of the Corps of Engineers. The report was submitted to the New Mexico State Engineer’s office for securing the base’s groundwater allocation.
Red Hill Regional Program Director, Naval Facilities Engineering Command * Steve was the Navy’s Project Manager (PM) for an Administrative Order of Consent (AOC) as regulated by the Environmental Protection Agency (EPA) for upgrading the Red Hill Bulk Fuel Storage Facility, which are the world’s largest known underground storage tanks. This facility includes 18 tanks 250 feet tall and 100 feet in diameter storing 250 million gallons of diesel and jet fuel in a mountainside on Oahu, Hawaii. He coordinated project efforts between regulatory agencies and a team of over 70 Navy engineers and professionals that included an evaluation of upgrades to the tanks and groundwater impacts to identify Navy mission requirements. This project included the installation of 12 monitoring wells and 4 production wells in basalt volcanic formations. It was the Department of Defense’s largest storage location for jet and ship fuel worldwide.
Steven J. Turnbull, PG, CHG
Senior Geohydrologist
gssiwater.com A-21
Makua Military Reservation Hydrologic Evaluation*
As Project Manager (PM), Steve successfully managed publication of an Environmental Impact Statement (EIS) for Live-Fire training. This EIS was an extensive evaluation of the impacts of 50+ years of Army live-fire training on soil, sediment, surface water, groundwater, fish, and seaweed. He supervised the installation of four boreholes with lysimeters, 10 monitoring wells in basaltic volcanic formations, and the collection of surface water flow measurements and chemistry samples from four intermittent streams. He also prepared a GSSHA watershed model and a MODFLOW/MT3D groundwater model to evaluate flooding and potential impacts on water resources. Steve led a team that produced detailed reports, prepared documentation for public meetings, and responded to multiple rounds of comments from the public, professional consultants, and regulatory agencies.
Low Impact Development (LID) Retrofit Analysis*
Steve conducted and supervised a survey of potential LID projects on Schofield Barracks and Wheeler Army Airfield that included infiltration galleries, filter strips, permeable pavers, and bioretention ponds as part of a Clean Water Act permit requirement. He performed calculations of flow and sediment reductions with a spreadsheet model that included ranking the projects and estimating the costs of each potential LID retrofit. This is an example of an Engineering with Nature Project as classified by the Army Corps of Engineers.
Live-Fire Training Range Evaluation*
Steve evaluated the potential impacts on surface water and groundwater of depleted uranium and explosive residues from degraded military rounds by managing the installation and operation of ISCO automated samplers for the data collection at Schofield Barracks and Makua Military Reservation. He reported the results to the Army Radiation Safety Office as part of an Army-wide Nuclear Regulatory Commission (NRC) license application.
Makua Military Reservation Bioremediation Evaluation*
Steve performed a phytoremediation and bioremediation project using ESTCP (Environmental Security Technology Certification Program) funding to evaluate the optimum application rates of water and molasses percentages for the degradation of RDX and HMX explosives in the subsurface.
He also performed simulations with a GMS prepared parallel FEMWATER model run at the ERDC DoD Supercomputing Resource Center (DSRC).
Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) Compliance, Schofield Army Barracks*
Steve managed and performed a multi-year Remedial Investigation (RI) for compliance under EPAs SUPERFUND program and the Army’s Installation Restoration Program (IRP). For this project, he supervised a field-testing program that incorporated in-situ air permeability tests, installation of 10 monitoring wells, hydraulic testing, and groundwater sampling to characterize the TCE solvent plume in a sole source drinking water aquifer. Steve and his team also prepared reports and responded to comments from the EPA, State of Hawaii Department of Health, and the public.
Hydrogeologic Evaluation for Environmental Impact Statement* Steve performed assessments of hydrogeological conditions for the EIS process and the design, installation, and testing of large-diameter irrigation wells and water exploratory wells for a groundwater recharge/storage project in Cadiz, CA to provide water for urban Southern California. *Projects prior to Geoscience
Steven J. Turnbull, PG, CHG
Senior Geohydrologist
gssiwater.com A-22
Years of Experience: 13
Years with Geoscience: 12
Education and Professional Registrations/Certifications:
6 BS, Geology, Cal Poly Pomona
6 BS, Integrated Earth Studies, Cal Poly Pomona
6 MS, Hydrology, University of Idaho
6 California Professional Geologist (No. 9531)
Lauren has more than a decade of experience with
groundwater and environmental investigations performed
for numerous municipalities, state agencies, and private clients throughout California. She performs groundwater flow and transport modeling, hydrogeologic investigations, groundwater basin and water quality studies, artificial recharge projects, and has experience in GIS mapping,
watershed management, database development and
management. Lauren can support your team by developing
accurate and complete written reports and documents, and by performing quality data review and evaluation.
Summary of Experience:
Searles Valley Minerals: Indian Wells Valley Groundwater Basin Adjudication
Lauren is currently participating in a Technical Working Group (TWG) on issues relating to sustainable management of the Indian Wells Valley Groundwater Basin. Lauren’s technical duties have included review of previous studies, including the area’s GSP, and collaborative development of a safe yield estimate for the Basin. Lauren also supports project management, communication, and coordination with TWG members and provides technical assistance for our client on other related issues.
California American Water: City of Marina v. RMC Lonestar, Monterey County Superior Court Lauren is part of a team of hydrogeologists providing technical support for a lawsuit against California American Water Company’s Monterey Peninsula Water Supply Project, a proposed desalination project that would draw water from slant wells drilled under the ocean. Lauren has participated in technical meetings and workshops, assisted with the development of groundwater flow and solute transport models to evaluate potential project impacts, helped draft expert reporting and review technical work submitted by opposing parties, and assisted with preparation for administrative hearings by the State Water Resources Control Board Administrative Hearings Office.
California American Water: Monterey Peninsula Water Supply Project (MPWSP) The MPWSP is a proposed ocean desalination project that would provide a much-needed alternative water supply to the Salinas Valley Groundwater Basin, which suffers from legacy seawater intrusion and overdraft. The project involves designing subsurface intakes for the proposed desalination plant, which will consist of a series of slant wells along the coast near Marina, CA. Lauren has been involved with technical support for the MPWSP since 2013. These efforts have included development, recalibration, and scenario runs of multiple generations of groundwater flow and solute transport models, support for the environmental impact review, permitting, operational planning, groundwater monitoring, and associated reporting. Lauren continues to support the project during the final slant Lauren Wicks, PG
Senior Geohydrologist
6 More than a decade of
experience supporting
groundwater modeling,
sustainable yield studies,
and calculating water
budgets—helping to
provide more accurate
and thorough models and
studies in order to present
options to improve basin
sustainability
6 Detail-oriented—helping
to provide more accurate
data and high-quality
deliverables
KEY QUALIFICATIONS...
gssiwater.com A-23
well design phase and development of a long-term monitoring plan to satisfy California Coastal Commission’s conditional project approval.
South Coast Water District: Doheny Ocean Desalination Project As part of a planned ocean desalination facility, Geoscience is helping South Coast Water District develop and construct subsurface slant well intakes to provide feedwater to the desalination facility.
The slant wells are traditional wells constructed at an angle that draw saline groundwater from beneath the ocean floor, eliminating impacts to marine life. Lauren supported reporting efforts and provided technical assistance during the project’s feasibility studies and environmental impact review.
She continues to support the project with modeling of anticipated project drawdowns during the well design phase.
Rainbow Municipal Water District: San Luis Rey Valley Groundwater Recovery Project Lauren acted as Geoscience’s project manager on a collaborative groundwater development feasibility study. The goal of the study was to assess the technical, economic, environmental, regulatory, and overall feasibility of an imported water return flow recovery project as a source for reliable water supply. Geoscience supported this effort by developing a surface water and groundwater flow model of the Bonsall Valley Subbasin to evaluate the amount of return flow potentially available for recovery, ran recovery model scenarios, developed a GIS-based site suitability analysis tool to identify parcels within the basin suitable for the proposed project, and provided cost estimates for well infrastructure.
Upper San Luis Rey Groundwater Management Authority: Groundwater Sustainability Plan for the Upper San Luis Rey Valley Groundwater Subbasin
Lauren led a team of geohydrologists to develop a Groundwater Sustainability Plan (GSP) for the Upper San Luis Rey Valley Groundwater Subbasin. She coordinated public outreach and communication between multiple stakeholders, directed the development of a surface water and groundwater flow model for the basin, and took the reporting lead. The GSP was approved by DWR and Lauren continues to provide support to the local GSA through coordination of routine monitoring and publication of annual reports.
Western Municipal Water District: Groundwater Sustainability Plan for Arlington Subbasin The Arlington Subbasin has been classified as a low priority groundwater basin under the Sustainable Groundwater Management Act (SGMA). Despite this, WMWD reached out to Geoscience to proactively develop a GSP for the subbasin to facilitate ongoing sustainable management. Lauren was part of the team that developed this GSP and took an active role in drafting the GSP document. Since it is a low priority basin, DWR review is ongoing.
Santa Ana Watershed Project Authority: Santa Ana River Waste Load Allocation Model Update
As part of the effort to estimate the projected total dissolved solids and nitrate-N concentrations of the Santa Ana River recharge water and discharge at Prado Dam, Lauren helped develop model scenario assumptions for the HSPF surface water model and evaluate model output. She summarized the results and findings of each project task, directed the creation of supporting figures and tables, responded to questions and comments from reviewers, and attended meetings to provide project status updates and present results.
San Bernardino Valley Municipal Water District: Santa Ana River (SAR) Integrated Model This joint effort involved a peer review by the USGS and other consulting firms and sought to understand how potential effects of proposed projects may impact surface flow in the SAR and groundwater levels for the entire Upper SAR Watershed. During this project, Lauren helped develop the Integrated SAR Model. She directed efforts to produce tech memos summarizing the approach, process, and results of each project task, helped develop assumptions for predictive model runs, and prepared meeting minutes. She was a point of contact for project communications with the different agencies involved in the project and presented results and project assumptions at progress meetings and model workshops.
Lauren Wicks, PG
Senior Geohydrologist
gssiwater.com A-24
Elsinore Valley Municipal Water District: Hydrogeologic Study of the Warm Springs Groundwater Subbasin
Lauren assumed a primary role in the hydrogeologic investigation of Warm Springs Subbasin to assess feasibility of the development of local groundwater resources to support EVMWD’s Integrated Water Resources Plan. This study involved the quantification of groundwater storage and safe yield for the Warm Springs Subbasin, estimation of potential yield for future municipal supply wells, determination of water quality and water treatment needs, identification of potential sites for well development, and consideration of environmental and permitting requirements.
San Bernardino Municipal Water District: Joint GW Model for the Rialto-Colton GW Basin Lauren prepared a tech memo comparing previous groundwater models covering the Rialto-Colton area to identify the strengths and weaknesses of each model and helped develop subsequent model construction and calibration reports. She aided in compiling a well database with locations, construction information, lithologic information, and water level/water quality data availability.
Additional modeling and reporting support included summarizing model construction, calibration, and predictive scenario results.
Calleguas Municipal Water District: Las Posas Valley Groundwater Basin Adjudication Lauren was involved in the Las Posas Valley Groundwater Basin adjudication, which adjudicated all groundwater rights in the basin and provided for sustainable management pursuant to SGMA. Lauren was part of a technical team of groundwater modelers who evaluated safe yield in the Las Posas Valley Groundwater Basin. In addition to providing technical review and assisting with the development of water budgets and expert reporting, Lauren supported project management, communication, and coordination efforts between our team and attorneys involved in a groundwater basin adjudication.
State of Texas: Texas v. New Mexico
Lauren supported project management, communication, and coordination between our team and attorneys involved in groundwater rights litigation appearing before the United States Supreme Court.
Olivenhain Municipal Water District: San Dieguito Valley Brackish Groundwater Desal Study OMWD relies almost entirely on imported water from the California and Colorado Aqueducts and is attempting to diversify its supply and produce groundwater locally. Lauren supported efforts to determine the amount of groundwater available in the San Dieguito basin and helped assess the feasibility of an inland desalting system.
Los Angeles County Public Works: Antelope Valley Groundwater Basin Adjudication Lauren assisted with Phases 3 and 4 of the 15-year adjudication process for the Antelope Valley. During these phases she provided support for expert testimony and the development of a physical solution.
This included the update and recalibration of a USGS model to verify the proposed sustainable yield, development of model scenarios to test the physical solution, and evaluation of the effect of outside pumping on recharge in the basin.
Castaic Lake Water Agency: Salt and Nutrient Management Plan for Santa Clara River Valley East Subbasin
Lauren assisted with the development of a Salt and Nutrient Management Plan (SNMP) to determine ambient water quality conditions in the East Subbasin and to ensure that water management practices are consistent with water quality objectives. This SNMP provided a framework for water management consistent with the Water Quality Control Plan Los Angeles Region (Basin Plan). Development of the SNMP also included development of a surface water and groundwater monitoring plan.
Rancho California Water District: Surface and Groundwater Model of the Murrieta-Temecula Groundwater Basin
Lauren helped conduct GSFLOW, soluble transport, and sustainable yield model runs to prepare a groundwater model plan in support of the Cooperative Water Resource Management Agreement (CWRMA) between the United States, on behalf of Marine Corps Base Camp Pendleton, and RCWD.
Lauren Wicks, PG
Senior Geohydrologist
gssiwater.com A-25
The purpose of CWRMA is to allow Camp Pendleton and RCWD to effectively manage water resources consistent with prior rights and entitlements while avoiding potential conflicts. Subsequently, Lauren helped evaluate and report on a systematic model update and refinement process.
Western Municipal Water District: TDS and Nitrate Lumped-Parameter Model for the Riverside and Arlington Groundwater Basins
Lauren helped create a lumped-parameter model to meet the groundwater basins’ monitoring and reporting requirements and assess compliance under various scenarios. She also helped prepare various technical memoranda throughout the modeling process.
Riverside Public Utilities: North Orange Well Field Evaluation, Well Siting, and Non-Potable Water Supply Assessment
Lauren helped interpret model results and prepared a technical memorandum summarizing the impacts of new potable and non-potable wells on the current North Orange well field wells.
Chino Basin Desalter Authority: Chino Basin Groundwater Model Update Lauren helped refine the Chino Basin Groundwater Model to evaluate impacts from proposed CDA wells. She also compiled data, updated model files, created model datasets, and calibrated the groundwater model.
Jurupa Community Services District: Geohydrologic Analysis of Future Groundwater Production
Lauren supported efforts to complete a geohydrologic analysis to determine future groundwater production potential.
East Valley Water District: Wastewater Reclamation Plant Engineering Report Lauren helped produce technical memorandums summarizing the predicted impacts of recharging recycled water at various recharge sites as part of the proposed Sterling Natural Resource Center. The analysis included determining the amount of underflow available as diluent water and calculating travel times for recycled water recharge and recycled water contribution at nearby production wells.
Lauren Wicks, PG
Senior Geohydrologist
gssiwater.com A-26
Years of Experience: 20
Years with Geoscience: 20
Education and Professional Registrations/Certifications:
6 BS, Geophysics, University of California, Riverside
6 California Professional Geologist (No. 9384)
Nathan has more than 19 years of experience completing
hydrogeologic investigations, source contaminant analysis, ground water quality studies, artificial recharge projects, water well test drilling programs, and construction observation for a variety of drilling projects. His experience includes both monitoring and groundwater studies—helping to verify
data that aid in the development of groundwater models
and studies that reflect basin conditions. He has also worked on water well design and construction oversight, as well as, performed various aquifer pump test analyses for 80+ drilling projects. Nathan has acted as field manager for Cal Am’s desalination feasibility study during the construction of an innovative slant well for subsurface seawater intake in Monterey County. He has managed the construction, data
collection, and long-term reporting of extensive monitoring well networks, with special focus on water quality database creation and management.
Summary of Experience:
California American Water Company: Monterey Peninsula Water Supply Project The Monterey Peninsula Water Supply Project (MPWSP) will provide up to 6 million gallons per day (24,227 m3
) of desalinated water to relieve pressure on the local groundwater aquifer. Nathan assisted in the completion of hydrogeologic studies of the area and to design and install 24 monitoring wells to collect data. Nathan is also providing weekly and quarterly monitoring and water quality testing for the slant well that feeds into the desalination plant. Drilled at an angle, the well pulls ocean water from beneath the ocean floor, protecting ocean wildlife and improving feed water quality. He was also the field manager during the construction of the test slant well.
City of Oceanside: Pure Water Oceanside
Nathan was part of a team that conducted a phased evaluation to characterize the Mission Basin and study the feasibility of Groundwater Storage and Recovery projects in the Lower San Luis Rey River Valley in northern San Diego County. With the findings suggesting the potential for a conjunctiveuse storage project in the Mission Basin, a geohydrological groundwater model was redeveloped and updated using these results. The team was also tasked with investigating groundwater replenishment reuse projects using treated wastewater from the City’s SLRWRF that would be discharged to the ocean. A series of groundwater analyses were conducted, technical and regulatory issues were analyzed, advanced wastewater treatment methods were identified, and groundwater recharge project options were developed. Based on the findings, the City and our team developed indirect potable reuse (IPR) groundwater augmentation project known as Pure Water Oceanside and expanding the City’s existing Title 22 tertiary recycled water distribution system.
South Coast Water District: Geophysical Survey & Subsurface Intake Design at Doheny Beach As part of a planned ocean desalination facility, Geoscience assisted South Coast Water District to develop and construct subsurface slant well intakes to provide feed water to the desalination facility.
The slant wells are traditional wells constructed at an angle that draw salty groundwater from beneath Nathan Reynolds, PG
Project Geohydrologist
6 Experience with
both monitoring and
groundwater studies—
helping to verify data that
aid in the development of
groundwater models and
studies that reflect basin
conditions
KEY QUALIFICATIONS...
gssiwater.com A-27
the ocean floor, eliminating impacts to marine life. Nathan supported reporting efforts and provided support during the project’s environmental impact review.
Olivenhain Municipal Water District: San Dieguito Valley Brackish Groundwater Desalination Study
Olivenhain Municipal Water District relies almost entirely on imported water from the California and Colorado Aqueducts. Nathan supported modeling efforts to study brackish groundwater desalination feasibility and location. He helped collect data, complete a hydrogeologic investigation, and performed well field and raw water collection, as well as helped to establish the monitoring network used in the long-term pumping test. Our team is also developing preliminary well designs, recommending brine management activities, supporting community outreach, and completing desktop environmental reviews.
Elsinore Valley Municipal Water District: Hydrogeologic Study of the Warm Springs Groundwater Basin
Warm Springs Groundwater Subbasin is a small, sedimentary groundwater subbasin located within Elsinore Valley Municipal Water District’s service area. To meet long‐term population growth and increasing water demand, the District explored options to develop water resources within the Warm Springs Subbasin. Nathan helped develop a HSPF model based upon the available precipitation data, land use, and soil types. Our team then calibrated the HSPF model with adjacent or nearby streamflow gages and quantify the Warm Springs Basin groundwater storage capacity and safe yield.
San Bernardino Valley Municipal Water District: Bunker Hill Basin Conjunctive Use Project Nathan helped evaluate extraction well and spreading ground locations for the Bunker Hill conjunctive use project. He helped determine locations, potential well capacities, and updated modeling assumptions for baseline conditions.
San Bernardino Valley Municipal Water District: Recharge Investigation of the Yucaipa Groundwater Basin
Nathan supported efforts to complete a hydrogeologic investigation at eleven potential sites within the Yucaipa Groundwater Basin for potential artificial recharge. Recommendations for subsequent phases of investigation were provided for each site.
San Bernardino Valley Municipal Water District and Partners: Determination of the Usable Capacity and Safe Yield for each Sub-basin within the Yucaipa Basin Area Nathan supported efforts to reevaluate sub-basin boundaries in the Yucaipa Groundwater Basin to assess the “safe yield” and storage capacity of each sub-basin. He assisted in the development of a watershed model of the Yucaipa Valley to determine water balance terms previously not calculated.
Yucaipa Valley Water District: Oak Valley Town Center Recharge Project Nathan supported efforts to complete a feasibility study for a recycled water recharge project. To complete the study, our team developed a focused groundwater model, a 3-D lithologic model, and developed fully equipped infiltration basin. Our team also installed monitoring wells complete with soil moisture and temperature sensors, and transducers. The infiltration basin was equipped with weather station and evaporation pan, integrated with telemetry. Our team also conducted aquifer pumping tests, and installed and conducted permeameter tests.
Nathan Reynolds, PG
Project Geohydrologist
gssiwater.com A-28
Years of Experience: 10
Years with Geoscience: 10
Education and Professional Registrations/Certifications:
6 BS, Environmental Science, Ocean University of China
6 MS, Environmental Engineering, University of Southern California
6 Engineer-in-Training
Si has more than 10 years of experience in groundwater and environmental investigations performed for municipalities, state agencies, and private clients throughout California, with specialized experience in modeling. She has conducted groundwater flow and solute transport modeling,
hydrogeologic investigations, groundwater basin and water quality studies, watershed modeling and management,
groundwater waste discharge permitting, GIS mapping, and database development and management. Si’s experience
includes development of a watershed model component
for an integrated model of the Upper Santa Ana River Basin, as well as calibrating the watershed model using data from 1966 through 2016 to simulate runoff generated within the watershed and quantify runoff inputs for the integrated model. Si also assisted in a hydrogeologic study of a groundwater basin in Riverside County, where she developed a HSPF model based upon the available data of precipitation, land use, and soil types, and calibrated the model with adjacent or nearby streamflow gages in order to quantify the groundwater storage and safe yield of the basin.
Summary of Experience:
San Bernardino Valley Municipal Water District: Santa Ana River Integrated Model Si is supporting efforts to combine existing groundwater and surface water models to develop an integrated watershed model for the upper Santa Ana River. The resulting integrated model will be used to determine what factors may contribute to declines river flows and assess cumulative effects on surface flows and groundwater levels. Si developed the watershed model component of the integrated model. She also calibrated the watershed model using data from 1966 through 2016 to simulate runoff generated within the watershed and quantify runoff inputs for the integrated model.
Santa Ana Watershed Project Authority: Santa Ana River Waste Load Allocation Model Update
Si helped update and recalibrate the existing Waste Load Allocation Model. She then evaluated waste load allocation scenarios for major stream segments and estimated off-channel recharge from natural precipitation. She then ran the updated model using historic discharge data to estimate the quantity and quality of the recharge that actually occurred. Si also compiled the waste load allocation model into a run-time software simulation package.
City of San Bernardino: US EPA Model
Si prepared the SBBA HSPF watershed model input data and run model; prepared recharge packages regarding stream bed percolation, mountain front runoff and areal recharge for Groundwater Flow Model based on water balance analysis from HSPF.
Yucaipa Valley Water District: Recycled Water Use Evaluation, Gateway Subbasin of Yucaipa GW Basin
Si developed focused groundwater model for the unconsolidated sediments of the Gateway Subbasin Si Si, MS, EIT
Project Modeler
6 A decade of experience
supporting groundwater
modeling, sustainable yield
studies, and calculating
water budgets—helping
to provide more accurate
and thorough models and
studies
KEY QUALIFICATIONS...
gssiwater.com A-29
and solute transport model MT3DMS, evaluated the effects, including travel times and percent contribution, of recharging recycled water at the Wilson Creek Spreading Basin under various recharge scenarios.
San Bernardino Valley Municipal Water District: Big Bear Overflow Modeling and Assessment
Si developed and calibrated the Seven Oaks Watershed model to estimate additional releases from Big Bear Lake and the resulting amount of additional water available for recharge projects.
California American Water: Monterey Peninsula Water Supply Project Si prepared cross-sections based on well logs, revised NMGWM and CEMEX Model layers, calculated and summarized hydraulic conductivity form grading analysis in CEMEX and Moss Landing Sites, mapped soil size distribution in dune sand aquifer and 180-foot aquifer equivalent, prepared weekly/monthly monitoring reports for Test Slant Well and surrounding monitoring wells, analyzed groundwater elevation changes and calibrated CEMEX focused groundwater model, calculated slant well feed-water supply, impacts and mitigation approaches.
City of Oceanside: Mission Basin Model Update and Evaluation of Indirect Potable Reuse (IPR)
Si is supporting efforts to update the Mission Basin Model to evaluate a planned IPR project. She updated the model to add a solute transport component and performed model calibration. Si then used the model to help evaluate potential recharge locations and determine recycled water travel time and concentrations in groundwater at selected locations.
Imperial Irrigation District: Seepage Recovery Investigation Si supported a seepage recovery investigation along the All-American Canal. She collected and analyzed historic hydrogeologic data to help build and calibrate a groundwater model. She then used the model to estimate water loss caused by canal seepage at different locations and assessed various seepage recovery scenarios.
Newport Pacific Land: Floriani Ranch Safe Yield and Hydrogeological Study Si supported efforts to complete a safe yield and hydrogeological study by characterizing current and historic hydrogeologic conditions at the Strata Verde Innovation Park. Si also developed surface and groundwater flow models to help evaluate the basin’s sustainable yield including historic and future water budgets. She then conducted modeling scenarios to assess project impacts on SGMA sustainability indicators.
Elsinore Valley Municipal Water District: Hydrogeologic Study of the Warm Springs Groundwater Basin
Si helped complete a hydrogeologic study in the Warm Springs Groundwater Subbasin to assess future production potential. She developed a HSPF model based upon the available data of precipitation, land use and soil types. She also calibrated the HSPF model with adjacent or nearby streamflow gages, and quantified the groundwater storage and safe yield of the Warm Springs Basin.
Si Si, MS, EIT
Project Modeler
gssiwater.com A-30
Years of Experience: 10
Years with Geoscience: 10
Education and Professional Registrations/Certifications:
6 BS, Environmental Engineering, Tianjin Institute of Urban Construction, China
6 MS, Environmental Engineering, University of Southern California
6 Engineer-in-Training
Leo has more than nine years of experience with
groundwater and environmental investigations performed for municipalities, state agencies, and private clients throughout California. He conducts groundwater flow and solute transport modeling, hydrogeologic investigations, groundwater
basin and water quality studies, watershed modeling and management, and artificial recharge projects. His experience has included supporting efforts to use existing groundwater and surface water models in the development of an integrated watershed model for the upper Santa Ana River, as well
as participating in the Yucaipa Groundwater Basin annual storage change calculation, where he measured ground water level and collected pumping, spreading data, and climatological data annually. Leo also has experience in GIS, database development and management, and well design.
Summary of Experience:
San Bernardino Valley Municipal Water District: Santa Ana River Integrated Model Leo is supporting efforts to use existing groundwater and surface water models to develop an integrated watershed model for the upper Santa Ana River. The resulting Upper SAR Integrated Model, will be used to determine what factors may contribute to declines SAR flows, and assess cumulative effects on SAR surface flows and groundwater levels.
Western Municipal Water District: TDS and Nitrate Lumped-Parameter Model for the Riverside and Arlington Groundwater Basins
Leo updated Groundwater Flow Model input packages to incorporate recharge and discharge components (i.e., flux terms) measured during the period from January 1965 through December 2007. He developed a lumped-parameter model for the period from 1965 to 2007 and calibrated through varying the anthropogenic return flow mass loading and initial TDS and nitrate concentration.
Leo then developed and ran predictive model runs for the period of 2015 through 2034 under four different scenarios.
Santa Ana Watershed Project Authority - Santa Ana River Waste Load Allocation Model Update
Leo helped update the Santa Ana River Waste Load Allocation Model, which is used by multiple agencies to assess water quality throughout the watershed. Leo collected and analyzed wastewater flow, water quality, and precipitation data to update and calibrate the model. Once completed, he then ran and evaluated waste load allocation scenarios in major stream segments in the watershed.
San Bernardino Valley Municipal Water District: Yucaipa Groundwater Basin Annual Storage Change Calculation
Leo measured ground water level and collected pumping, spreading data, and climatological data Leo Liu, MS, EIT
Project Modeler
6 A decade of experience
supporting groundwater
modeling, sustainable yield
studies, and calculating
water budgets—helping
to provide more accurate
and thorough models and
studies
KEY QUALIFICATIONS...
gssiwater.com A-31
annually. He also digitized water level data from 2005 to 2013 for the Yucaipa area using GIS software.
Leo then used groundwater elevation contours from each year to calculate groundwater storage capacity.
San Bernardino Valley Municipal Water District: Rialto Colton Model Leo collected and digitized water data from 1945, and 2011 using GIS software. He calculated the water budget including underflow from Lytle Basin, underflow from Bunker Hill Basin, artificial recharge of imported water, ungaged runoff and subsurface inflow from the San Gabriel Mountains and Badlands, stream bed percolation from the Santa Ana River and Warm Creek, groundwater pumping, and evapotranspiration.
City of San Bernardino: US EPA Model
Leo prepared the SBBA HSPF watershed model input data including land use, channel type and evapotranspiration data and run model.
Jurupa Community Services District: Geohydrologic Analysis of Future Groundwater Production
Leo supported efforts to complete a geohydrologic study to help determine future groundwater production. He exported the Chino Basin Groundwater Model from the recently-completed Integrated Santa Ana River Model, and ran model scenarios to analyze the groundwater balance.
Mojave Water Agency: Groundwater Model
Leo supported efforts to update a groundwater flow model and analyze water balance for a planned groundwater recharge project. To complete the model, he extended the MODFLOW-NWT model with data from 2005 to 2017.
East Valley Water District: Sterling Natural Resource Center Study Leo developed a surface flow spreadsheet model to quantify recycled water percolation. He also ran a solute transport model to evaluate predicted recycled water travel distance, distribution of percent recycled water, retention time, and recycled water concentration at the nearest active municipal wells.
Rancho California Water District (Kennedy Jenks): Recycled Water Project Leo ran groundwater flow modeling scenarios to evaluate potential recycled water recharge locations and determine recycled water retention time. He also helped prepare the draft and final project report.
Rancho California Water District: Safe Yield Calculation in the Northern Murrieta Valley Area Leo helped calculate the amount of groundwater that could safely be pumped from the Northern Murrieta Valley Area. He updated the safe yield calculation using Zero Net Draft and developed a water balance for the basin. At the conclusion of the project, Leo prepared the draft and final report.
Rancho California Water District: Upper Valle De Los Caballos Recovery Wells The groundwater recharge facility in the Upper Valle De Los Caballos basin is connected to a relatively shallow aquifer, limiting the ability to recover recharge water. Leo helped complete modeling to evaluate additional recovery wells and placement. He developed and calibrated the basin focused model and ran scenarios to evaluate potential slant well and vertical well locations.
Leo Liu, MS, EIT
Project Modeler
gssiwater.com A-32
Years of Experience: 10
Years with Geoscience: 9
Education and Professional Registrations/Certifications:
6 BA, Geology, Calvin College, Michigan
6 MS, Geosciences/Hydrogeology, Western Michigan
University, Kalamazoo
6 California Professional Geologist (No. 10107)
Seth has a decade of hydrogeological experience, performing well construction inspection for tasks such as pilot borehole drilling and reaming, casing inspection and installation, air lifting and swabbing, development by pumping, and downhole video logging. He has also conducted water quality sample collection of groundwater and surface water, as well as geohydrologic investigations. Types of wells Seth has been involved in include high capacity municipal water supply wells, test boreholes, and monitoring wells using the reverse rotary drilling method. Seth has also prepared well designs based on data collected during the drilling process, provided final pump design recommendations, and written final
summary reports.
Summary of Experience:
California American Water: Monterey Peninsula Water
Supply Project
Seth is currently performing field efforts for the Monterey Peninsula Water Supply Project. He is responsible for
monitoring sampling and maintenance of the test slant well, bi-annual sampling of 24+ monitoring wells, and monthly monitoring of the well network, as well as quarterly reporting, data management, and hydrographs. In the beginning of the project, Seth performed a hydrologic investigation of wetlands that included drilling the test well (sonic drilling), conducting the pump test, collecting 8-ft. soil cores, and installing and monitoring piezometers.
Pico Water District: Well Siting Study
Seth supported efforts to draft a well siting assessment report for the Pico Water District by analyzing the viability of multiple well locations.
Civilsource-Bellflower-Somerset Mutual Water Company: Leahy Avenue Well Seth supported field efforts for the Leahy Avenue Well for the Bellflower-Somerset Mutual Water Company. He inspected pilot hole drilling, collected soil samples for lithologic logging, and oversaw isolated aquifer zone testing for yield and water quality. He also supervised well construction.
Yucaipa Valley Water District: Artificial Recharge Feasibility Study Seth supported field efforts to complete a feasibility study for a proposed artificial recharge facility.
In the field, Seth performed a five-day pump test including setting up flow meters, and transducer network in surrounding production and monitoring wells. He also performed mechanical grading analyses in test boreholes and calculated hydraulic conductivity values. Seth provided additional support by monitoring water levels and collecting and downloading data from field instruments.
Seth Kuiper, PG
Project Geohydrologist
6 Ability to manage the
monitoring and reporting
of large monitoring well
networks
6 Field experience supporting
well construction,
development, and testing
projects—helping to
maximize well production
and efficiency
6 Well versed in the
inspection of pilot borehole
drilling and reaming, casing
inspection and installation,
air lifting and swabbing,
development by pumping,
and down-hole video
logging
KEY QUALIFICATIONS...
gssiwater.com A-33
Rancho California Water District: Annual Subsidence Monitoring Geoscience conducts annual subsidence reporting for the district and reviews current hydrogeological data to recommend actions needed to mitigate land subsidence. Seth has conducted research and compiled data to support the annual subsidence report.
Elsinore Valley Municipal Water District: Warm Springs Groundwater Basin Hydrogeologic Study
Seth supported field efforts to complete a hydrogeologic study of the Warm Springs Groundwater Basin to determine future production potential. He performed constant rate tests at local wells and processed results.
West Valley Water District: Groundwater Sampling
Seth conducted quarterly groundwater sampling for three monitoring wells. Sampling activities included quarterly sampling using snap sampling technology and annual oversite of sampling using bladder pump technology to collect Title 22 samples.
Angus Petroleum: Monitoring Well Sampling
Seth oversaw monthly groundwater sampling and prepared monthly reports outlining groundwater sampling and monitoring results. He also managed datasets and prepared hydrographs.
City of Huntington Beach: Well 1 Replacement
Seth supported well destruction and replacement for the City of Huntington Beach. He performed site inspections including chlorine injection and well alignment surveys.
City of Torrance (Water Works Engineers): North Torrance Wellfield Phase 3 Seth aided efforts to expand the NTWF by providing field support during design and construction.
During design, Seth performed mechanical grading analysis on samples collected in the field to determine screen intervals. During construction, he observed casing construction, filter pack placement, and completed geophysical logs.
Elsinore Valley Municipal Water District: Near Term Water Supply Program Seth supported our team through performing field observation relating to chemical injection for the water well rehabilitation project of three wells.
Rancho California Water District: Well 231 Replacement
Seth supported field efforts to replace Well 231 for Rancho California Water District. He participated in field meetings, inspected pilot hole drilling, collected soil samples, and oversaw isolated aquifer zone testing for yield and water quality. He also prepared field reports and the well summary report.
Three Valleys Municipal Water District: Miragrand Well
As part of an on-call support contract, Seth performs field support to well characterization. To date, he has performed well step tests and analysis to assess well efficiency. Seth also performs field support to verify sonic sounder readings in two of the District’s wells.
Western Municipal Water District: Arlington Area Well Siting Seth supports our team on an ongoing well siting study located in the Arlington Basin. He analyzes the necessary criteria using GIS software to select potential injection well locations.
City of South Pasadena: Wilson Well No. 2 Rehabilitation Seth performed field observation during Wilson Well No. 2 rehabilitation. He observed rehabilitation by chemical injection, and swab and airlift. Seth then observed well redevelopment, step testing, and constant rate testing.
Rancho California Water District: New Well 176 Drilling Phase Seth supported efforts to construct a new production well and provided contractor oversight during drilling activities. Support included observation during zone testing, casing installation, well development by swab and airlift, disinfection, and E-log analysis.
Seth Kuiper, PG
Project Geohydrologist
gssiwater.com A-34
Years of Experience: 13
Years with Geoscience: 4
Education and Professional Registrations/Certifications:
6 BS, Geological Sciences, California State University, Fullerton
6 Geologist-in-Training, CA
Robert has more than a decade of professional experience that was earned from working as a field geologist, project manager, and client service manager on a diverse range
of challenging projects that have focused on groundwater recharge and banking, construction management,
environmental site investigations and characterization, real estate redevelopment/due diligence, and regulatory compliance. Robert is experienced with managing from the field all aspects of exploratory drilling and well construction including development, pump testing, disinfection, water quality sampling, as well as well rehabilitation. He has logged, managed the construction, and participated in the design for more than 35 large diameter groundwater supply wells in Southern and Northern California using mud direct rotary and reverse circulation drilling methods.
Summary of Experience:
Elsinore Valley Municipal Water District: Technical Plans, Specifications, and Estimate for Rehabilitation of the Terra Cotta Well, and Construction Management Inspection, and Permitting Support
Robert was responsible for completion of technical plans, specifications, and estimate of the rehabilitation of one existing well including mechanical and chemical rehabilitation, redevelopment, and aquifer testing.
Elsinore Valley Municipal Water District: Joy Street Well Rehabilitation Robert provided field oversight during rehabilitation of one mild steel 20-inch diameter 1,680 feet deep well with 1,020 feet of screen. Robert inspected chemical treatment, mechanical development such as swabbing and airlifting and pumping development, aquifer pump testing, and spinner log survey, and collected water quality samples.
Rancho California Water District: Technical Plans, Specifications, and Estimate for Three New Production Wells, Construction Management Inspection, Permitting and Bidding Support Robert was responsible for completion of technical plans, specifications and estimate of the drilling, construction, development, and testing of three new production wells in the District’s UVDC recharge facility. The new wells will bolster and add flexibility to the District’s water supply.
Elsinore Valley Municipal Water District: Near-Term Water Supply Program, Lee Lake Wells No. 1 and No. 2, Construction Management Inspection and Permitting Support Robert was responsible for collecting data and inspection of the drilling, construction, development, and testing of two new ~100-foot deep production wells. This included conductor casing installation and sanitary seal, pilot hole drilling, geophysical survey, isolated aquifer zone testing, well construction, borehole reaming, swab and airlift development, pump and surge development, step test, 24-hr constant rate test and recovery, plumbness and alignment survey, video survey, water Robert Sia, GIT
Project Geohydrologist
6 More than a decade of
experience with both
well construction and
groundwater studies—
helping to verify data to
aid in the development of
groundwater models and
studies that reflect basin
conditions.
KEY QUALIFICATIONS...
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quality sampling, and final well disinfection. Robert also helped write the well summary report.
Kimley Horn: Madera County Water Supply Evaluation and Technical Plans, Specifications, and Esimate
Robert helped evaluate the water supply at a potential site for a new distribution warehouse. The location was outside of the service area of existing public water purveyors. Robert helped draft a preliminary design report for two new potable water supply wells that included review of the effective base of the productive alluvial aquifer system, construction details and pumping data for nearby existing wells, current and historic water level data, current and historic groundwater quality, potential sources of contamination, and construction constraints. He also created technical specifications to drill one 700-foot test borehole and perform isolated aquifer zone testing.
Rancho California Water District: Preliminary Design and Technical Specifications for Construction of New Well No. 172 and New Monitoring Well No. 512 Robert played a major role in drafting preliminary well designs, technical construction specifications and sheets, bid items, engineer’s estimate, Drinking Water Source Assessment and Protection (DWSAP) Report, and the well construction permit application. Technical specifications covered drilling, construction, development, testing, and disinfection. The design involves Well No. 172 extracting groundwater from the Pauba Aquifer while Monitoring Well No. 512 provides a point to collect groundwater level data. Rancho California Water District plans to add Well No. 172 to their network of groundwater recovery wells operated at the Upper Valle De Los Caballos Recharge and Recovery Facility containing 100 acres of recharge ponds. The goal of the facility is to increase groundwater recharge and recovery in Pauba Valley. Monitoring Well No. 512 is situated in the middle of a recharge pond and screened across the Pauba Aquifer.
Western Municipal Water District: Victoria Basin Stormwater for Recharge Pilot Project – Technical Plans Specifications and Estimate for One New Monitoring Well Cluster Robert helped create a well design and technical specifications to drill, construct, develop, and test one monitoring well cluster composed of two 2-inch wells at 60 and 120 ft deep.
East Valley Water District: Tracer Study, Construction Management Inspection of Two New Triple Nested Monitoring Wells MW-A and MW-B
Robert was responsible for providing field inspection of one set of nested monitoring wells containing three separate well casings, screened at different depth intervals. Robert inspected drilling of the pilot borehole drilled by the fluid reverse circulation rotary method, logging lithology of drill cuttings, enlarging of the pilot borehole, and well construction. Robert was also responsible for collecting water quality samples from two completed and developed wells for three monitoring events including original construction.
Bedford-Coldwater Groundwater Sustainability Authority: Construction Management Inspection of New Monitoring Wells No.1 and No. 2
Robert was responsible for inspection of the construction, development, and water quality sampling of two new monitoring wells (290 and 350 ft deep) located within the Bedford- Coldwater Groundwater Subbasin. Sonic and direct mud rotary drilling rigs were used. Robert also prepared ancillary equipment, bench tested, calibrated, and installed new pressure dataloggers in these two monitoring wells and in two existing production wells (City of Corona Well 20 and EVMWD Trilogy Well).
Chino Basin Desalter Authority: Construction Management Inspection of New Monitoring Well II-MW4
Robert provided field inspection during the construction of one 410-ft deep 4-inch diameter PVC monitoring well. The monitoring well was constructed to serve as a downgradient monitoring point for CDA Well II-12. The CDA removes salts from brackish groundwater extracted from the lower Chino Basin with the Chino I and II Desalter facilities.
CADIZ Inc.: Technical Plans and Specifications, Construction Management Inspection and Robert Sia, GIT
Project Geohydrologist
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Groundwater and Surface Water Level/Quality Field Data Collection from Monitoring Wells Network and Two Springs
Robert helped with the drafting of technical plans and specifications for three production wells and one monitoring well. Robert was responsible for construction management inspection of the construction of one new production well, and the development and aquifer testing of two new production wells. Robert was on the field team that was responsible for collecting water level data and water quality samples from about 50 wells. Robert also helped collect water quality samples and monitoring data from Bonanza Spring and Vontrigger Spring. Bonanza Spring is located in the Clipper Mountains approximately 11 miles north of the center of Fenner Gap, and Vontrigger Spring is located in the Vontrigger Hills east of Hackberry Mountains.
City of Oceanside, Pure Water Oceanside: Construction Management Inspection of Two New Injection Wells
Robert provided inspection of pump development for two newly constructed injection wells. The injection wells are part of the Pure Water Program, which creates a new and reliable local source of drinking water by injecting recycled water into the aquifer, extracting, and purifying at the Mission Basin Groundwater Purification Facility.
Hansji Hotels: Lee’s Ferry, Marble Canyon Well 1
The test and analysis were performed to assess the groundwater production of an existing well and the feasibility of using the well as a source of water for a planned hotel property development. Robert helped by reviewing the geology and existing well details, analyzing constant rate pumping test data from a transducer, and drafting a summary technical memorandum.
Rancho California Water District: Update and Enhancement of the Cooperative Water Resources Management Agreement (CWRMA) Model and Site Suitability Analysis Tool Robert helped evaluate the potential suitability of sites for use as recharge basins by determining the optimal property sizes and creating a criteria-scoring matrix to input into the GIS site suitability analysis tool (ESRI ArcGIS Pro ModelBuilder). The scoring matrix evaluated land use, parcel size, soil type, flood zones, proximity to existing production wells and DWR open case sites, and distance from existing infrastructure. Robert helped write a technical memorandum to document the update of the model and site suitability analysis tool.
California American Water: Monterey Peninsula Water Supply Project (MPWSP) Robert helped provide further insight into the geology of the subbasins. Robert reviewed existing borehole lithology data and created 3 subsurface cross-sections in the Monterey and Seaside Subbasins, which included the Dune Sand, Aroma Sand, 400-Foot, and 180-Foot Aquifers; the Fort Ord Salinas Valley and 180/400-Foot Aquitards; and the Paso Robles, Purisma, and Santa Margarita Formations.
Yuima Municipal Water District: Groundwater Sustainability Plan for Upper San Luis Rey Valley Groundwater Basin
Robert reviewed DWR driller’s logs, existing geologic data, and studies and created four (4) cross sections of subsurface geology in the Pala and Pauma Subbasins, which included young and old alluvium, Paleo Lake Pauma, and bedrock complex. Robert helped analyze water level data by creating hydrographs for key monitoring wells.
Robert Sia, GIT
Project Geohydrologist
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Years of Experience: 10
Years with Geoscience: 10
Education and Professional Registrations/Certifications:
6 BS, Geology, California State University, Fullerton
6 Geologist-in-Training, CA
Coral has a decade of experience performing well construction inspection for tasks such as pilot borehole drilling and reaming, casing inspection and installation, air lifting and swabbing, development by pumping, and down-hole video
logging. She has performed various pumping test analyses, including large scale pumping tests and water quality sample collection. Coral also prepares well designs based on data collected during the drilling process, provided final pump design recommendations, and final summary reports.
Summary of Experience:
City of Huntington Beach: Well Site Evaluation (8 sites) Coral assisted with a comprehensive geohydrological
evaluation of multiple potential sites to identify the most suitable well site locations for the City of Huntington Beach.
The evaluation carefully considered key factors that were weighted based on its importance, allowing the sites to be ranked systematically. Coral also helped prepare preliminary designs and recommendations for well drilling and testing.
City of Oceanside: Groundwater Well Site Evaluation
Coral assisted with a thorough geohydrologic assessment evaluating the local aquifer systems, groundwater production potential, and water quality. Using a weighted ranking methodology based on 13 criteria, locations that maximized production potential while mitigating risks related to environmental hazards and land use constraints were identified and prioritized. Refined from an initial preliminary site selection process to seven locations, each were assessed against multiple criteria including groundwater availability, potential interference with existing wells, and environmental considerations.
Sweetwater Authority: Well Siting Study
Coral performed the well siting study for Sweetwater Authority, located in National City, CA. Coral collected and processed relevant data from multiple sources, such as regulatory bodies, historical records, geohydrologic models, geophysical models, and used this information to develop a technical report and maps containing the findings of the study. She also provided field observation during exploratory drilling and permitting support for the client.
Yucaipa Valley Water District: Aquifer Storage & Recovery Wells (Injection/Recovery Wells) Coral is providing field observation and well development of three new injection wells and two new recovery wells for the Oak Valley Town Center Recharge Project.
Golden State Water Company: Willowbrook No. 4
Coral managed the field observation to construct a new well for municipal use in Los Angeles’ Central Basin. He was responsible for observing aquifer zone testing, sampling, grading analysis, casing and gravel pack installation, swab and airlift development, pump development, and downhole video survey. Coral also prepared the final Summary Report for this well.
Coral Shaw, GIT
Project Geohydrologist
6 Field experience supporting
well construction,
development, and testing
projects—helping to
maximize well production
and efficiency
6 Well versed in the
inspection of pilot borehole
drilling and reaming, casing
inspection and installation,
air lifting and swabbing,
development by pumping,
and down-hole video
logging
KEY QUALIFICATIONS...
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Elsinore Valley Municipal Water District: Multiple Well Projects, On-Call Hydrogeology Services Contract
As part of this on-call contract, Coral provided inspection services for several EVMWD wells, including construction management for three well rehabilitations - Diamond Well, Summerly Well, and the Mayhew Well.
Elsinore Valley Municipal Water District: Near Term Water Supply Program Coral provided construction management services for the rehabilitation of five EVMWD wells, including Flagler Wells 2A and 3A, Cereal Wells 1 and 3, and the Terra Cotta Well. She also provided inspection and testing services during the construction of the two new Lee Lake Wells.
Riverside Public Utilities: Well Rehabilitation and Groundwater Monitoring Program Coral helped compile and review historical well data for 60 potable water supply wells to develop a well ranking system prioritizing wells in need of rehabilitation and repair. She also created well summary letters detailing existing well conditions.
Three Valley Municipal Water District: Miragrand Well
Coral supported design efforts and was the lead inspector for a new potable supply well. This project provided unique challenges in that it is in an affluent residential community whose neighbors do not want construction activity to disturb them. Close coordination and additional noise mitigation procedures were required to complete this work.
Chino Basin Desalter Authority: Ph. 3 Well II-10 & II-11 Coral developed pre-bid meeting notes, reviewed technical specifications, and bid contracts. She also provided on-site observation during constant rate testing and pump development.
City of Torrance (Water Works Engineers): North Torrance Well Field Coral provided construction observation for three new groundwater production wells. Field activities included observing and documenting well construction, pump development, and step and constant rate testing.
City of Lakewood: New Well No. 28
Coral supported efforts to design and construct a new production well for the City. She led the coordination efforts with the City and drilling contractor, and observed pilot and conductor borehole drilling and casing installation. Coral also reviewed drilling data and helping to develop the final well design.
Orange County Water District: Alamitos Barrier Improvement Project Coral supported design efforts and provided field observation and coordination to install 17 new injection wells, four nested monitoring wells, and two shallow piezometers. The injection wells will serve to increase the capacity and effectiveness of the existing Alamitos seawater barrier system.
Coral was involved in all construction, development, and testing phases. She also oversaw final video inspection, performed final site inspections, and helped develop the final project report.
RCWD: New Well No. 176 Drilling Phase
Coral provided field observation and permitting support for a new groundwater production well.
During construction, Coral observed conductor borehole and casing install, mechanical development, and final video survey. She also developed the preliminary and final Drinking Water Source Assessment and Protection documentation and helped prepare the final well construction report.
Hillwood Investment Properties: Raub Well Relocation, and Raub Wells 1, 4, and 5 Destruction
Coral provided all onsite field supervision, field work, well destruction letters, and observed well bailing, filling the casing with cement, and well head burial and cementation.
California American Water Service Company: Monterey Peninsula Water Supply Program As part of the Monterey Peninsula Water Supply Program (MPWSP), Geoscience helped develop slant Coral Shaw, GIT
Project Geohydrologist
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well subsurface intakes to provide ocean desalination feed water. The proposed reverse osmosis ocean desalination facility will provide a new source of water and reduce impacts to the local groundwater basins and nearby Carmel River. To support the project, Coral provided field observation during test slant well construction and development. During and after a two-year pump test, Coral performed follow up well monitoring and water quality sampling.
Eastern Municipal Water District: Well 64
Coral provided full-time and part-time on-site supervision during pilot hole reaming, casing installation, filter packing, and mechanical development by swab and airlifting.
Rancho California Water District: Well 161
Coral helped respond to project submittals, provided full-time and part-time on-site supervision during conductor borehole drilling, conductor casing install, pilot borehole drilling, geophysical logging, and pilot borehole zone testing.
Rancho California Water District: Well 236, 237, and 238 Coral helped complete Preliminary and Final Drinking Water Source Assessment and Protection documents. She also provided full-time and part-time on-site supervision during pilot borehole drilling, geophysical logging, and pilot borehole zone testing.
Coral Shaw, GIT
Project Geohydrologist
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Years of Experience: 13
Years with Geoscience: <1
Education and Professional Registrations/
Certifications:
6 MS, Geology, Colorado State University
6 BA, Geology, Colby College
Andrew has more than a decade of geological consulting
experience, previously specializing in oil and gas projects located in Alberta, Texas, and Colorado. This experience includes groundwater-relevant services such as basin and reservoir studies and mapping, wellsite supervision and logging, regulatory filings, and reservoir modeling. Andrew also brings additional experience in geostatistics, computer programming, and groundwater modeling. Andrew
currently provides field supervision during well design and construction, water quality sampling and analyses, and
assisting in the completion of well summary reports.
Andrew McCarthy
Senior Associate Geohydrologist
6 Field experience and
familiarity with drill-cutting
sampling and lithology
logging for well siting.
6 Experienced in
groundwater modeling and
geostatistics
KEY QUALIFICATIONS...
Summary of Experience:
Golden State Water Company: Willowbrook No. 4
Andrew provided field observation to construct a new well for municipal use in Los Angeles’ Central Basin. He was responsible for observing aquifer zone testing, sampling, grading analysis, casing and gravel pack installation, swab and airlift development, pump development, and downhole video survey. Andrew also helped prepare the final Summary Report for this well.
CADIZ Inc.: Collecting Water Level and Samples from Monitoring Wells and Two Springs Andrew is currently part of the field team that is responsible for collecting quarterly water level data and water quality samples from 50+ wells in the Mojave Desert. During quarterly monitoring events, Andrew collects water quality samples and monitoring data from Bonanza Spring and Vontrigger Spring to monitor any changes that happen over each season. Bonanza Spring is located in the Clipper Mountains approximately 11 miles north of the center of Fenner Gap. Vontrigger Spring is located in the Vontrigger Hills, east of the Hackberry Mountains.
Chino Basin Desalter Authority: Production and Monitoring Well Design Andrew reviewed materials from three previous wells for the same client to use in creation of new well technical specifications for three new production wells and two new monitoring wells.
Yucaipa Valley Water District: Aquifer Storage & Recovery Wells (Injection/Recovery Wells) Andrew reviewed technical specifications for three new injection wells and two new recovery wells to use in creation of bid contract documents for the project.
City of Santa Monica: On-Call Hydrogeological Services
Andrew assisted on well figures for the City of Santa Monica.
Bering Exploration Company, Petroleum Geologist and Seismic Interpreter* Andrew served as the principal geologist and seismic interpreter for an Alberta-focused conventional exploration and development company. His main roles were as a prospect generator and proven hydrocarbon finder, working both independently and as part of a small team. Andrew’s responsibilities included synthesizing well log mapping with seismic interpretations to develop prospects from gssiwater.com A-41
analogy reservoirs; combining pressure, fluids, and production data with mapping, petrophysical, and core analyses to generate reservoir volumetrics and material balances; and analyzing nearby well completions for design input.
Additionally, Andrew was responsible for logging wellsite geological data in the field, including drill cuttings sampling, lithology logging, and supervising petrophysical logging. His experience during this role also included 3D seismic acquisition planning and project management, business development, and regulatory assistance.
*Projects prior to Geoscience
Andrew McCarthy
Senior Associate Geohydrologist
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Years of Experience: 3
Years with Geoscience: 2
Education and Professional Registrations/Certifications:
6 BS, Applied Geology, Metropolitan State University of Denver
6 Master of Geosciences, Tectonics, Colorado State
University
Lindsay is currently involved in many well projects, well assessments, groundwater level monitoring, water well test drilling programs, well rehabilitation, and new construction.
She performs field supervision during well design and
construction, water quality sampling and analyses, and well rehabilitation/redevelopment.
Summary of Experience:
Camrosa Water District: University Well Rehabilitation
Lindsay provided field oversight during rehabilitation of one mild steel 12-inch diameter 900 feet deep well with 620 feet of screen. Lindsay inspected mechanical development such as swabbing and airlifting and pumping development, aquifer pump testing, spinner log survey, and chemical treatment. Lindsay observed the collection of water quality samples and post-rehabilitation video survey. Lindsay also prepared a final summary report for the University Well which provides brackish groundwater to the district’s desalination facility.
CADIZ Inc.: Three New Irrigation Wells
Lindsay provided field observation to construct three new irrigation wells for agricultural use in California’s Mojave Desert. Lindsay observed pilot drilling, grading analysis, final borehole reaming, casing and gravel pack installation, well and pump development, plumbness and alignment survey, downhole video survey and all geophysical logging. She also observed the final well disinfection.
Lindsay helped prepare the final Summary Report for all three irrigation wells.
Rancho California Water District: New Well 172 and Monitoring Well 512 Lindsay provided field observation to construct two wells for RCWD use in California’s Mojave Desert.
Lindsay observed pilot drilling, grading analysis, final borehole reaming, casing and gravel pack installation, well and pump development, plumbness and alignment survey, downhole video survey and all geophysical logging, and she observed the final well disinfection.
CADIZ Inc.: Collecting Water Level and Samples from Monitoring Wells and Two Springs Lindsay is on the field team that is responsible for collecting quarterly water level data and water quality samples from 50+ wells in the Mojave Desert. During quarterly monitoring events, Lindsay collects water quality samples and monitoring data from Bonanza Spring and Vontrigger Spring to monitor any changes that happen over each season. Bonanza Spring is located in the Clipper Mountains approximately 11 miles north of the center of Fenner Gap. Vontrigger Spring is located in the Vontrigger Hills east of Hackberry Mountains.
California American Water: Monterey Peninsula Water Supply Project The Monterey Peninsula Water Supply Project (MPWSP) is a multifaceted project to improve water supply and reliability to the Monterey Peninsula. Lindsay is assisting in monthly monitoring and water quality testing for the slant well that feeds into the desalination plant. Drilled at an angle, the well pulls ocean water from beneath the ocean floor, protecting ocean wildlife and improving feed water quality.
Lindsay Mota
Associate Geohydrologist
6 Field experience and
familiarity with water
quality sampling —helping
to provide more accurate
field data and monitoring
KEY QUALIFICATIONS...
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Lindsay is also supporting monthly field data collection and maintenance on the monitoring wells in the area surrounding the slant well.
City of Oceanside: Pure Water Oceanside Tracer Study
Lindsay has provided field support during the Pure Water Oceanside tracer study. She assisted in setting up equipment and data collection during the initial injection of SF-6. Lindsay also helps collect field data and samples for water quality at various well locations while the tracer study is on-going.
South Coast Water District: Monthly Data Updates for the Doheny Desalination Project Lindsay provides monthly data updates for the South Coast Water District project. Each month, transducer data is provided to Geoscience to help monitor changes in water level and conductivity.
Lindsay pulls data from HydroDave and Sigma to monitor changes in data and uses it to compare to the data provided to Geoscience. The objective of this project is to define: a maximum pumping limit, criteria for reducing pumping if Basin conditions show that pumping could threaten to violate water rights permits terms and conditions, and a monitoring program to track Basin conditions.
Lindsay Mota
Associate Geohydrologist
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Years of Experience: 2
Years with Geoscience: 2
Education and Professional Registrations/Certifications:
6 BS, Earth Sciences, University of California San Diego at Scripps Institute of Oceanography
Nicolette has recent experience in performing well siting studies and contributing to the development of Geoscience’s proprietary Site Suitability Analysis Tool, as well as providing permitting assistance, collecting and analyzing data,
and developing technical reports and maps. Nicolette
also provides field supervision during well design and
construction, water quality sampling and analyses, and
assisting in the completion of DWSAP assessments.
Summary of Experience:
Sweetwater Authority: Well Siting Study
Nicolette performed the well siting study for Sweetwater Authority, located in National City, CA. During the project, she contributed to development of Geoscience’s proprietary Site Suitability Analysis Tool, introducing new methods of data analysis using multivariate interpolation. Using this tool, a custom suitability model was created for the project based on various criteria (i.e., geohydrologic, environmental, engineering, logistical). Nicolette collected and processed relevant data from multiple sources, such as regulatory bodies, historical records, geohydrologic models, geophysical models, and used this information to develop a technical report and maps containing the findings of the study. She is currently providing construction and permitting support for the client.
City of Huntington Beach: Well Site Evaluation (8 sites) Nicolette is part of a team that conducted a comprehensive geohydrological evaluation of multiple potential sites to identify the most suitable well site locations for the City of Huntington Beach. The evaluation carefully considered key factors that were weighted based on its importance, allowing the sites to be ranked systematically. Logan also prepared preliminary designs and provided recommendations for well drilling and testing.
City of Santa Monica: Well Rehabilitation and Replacement Priority Evaluation Nicolette is part of a team to evaluate the current condition of wells and provide recommendations for their systematic rehabilitation or replacement for the City of Santa Monica. The evaluation assessed 14 groundwater extraction wells using a fifteenth destroyed well to test and calibrate the scoring and ranking matrix designed to identify wells that are most in need of immediate attention, while also providing a framework for future well maintenance and replacement planning. The team developed well-specific recommendations for rehabilitation for five wells based on the available data, the results of the scoring and ranking matrix, and City plans.
Camrosa Water District: University Well Rehabilitation
Nicolette was part of a team to assess the condition of University Well, develop a rehabilitation work plan, and provide field services during the testing and rehabilitation of the well. The team provided data review, conducted a step drawdown pumping test, and performed a video survey after a pump failure and developed a rehabilitation program, which consisted of both a mechanical and chemical component.
Nicolette Nguyen
Associate Geohydrologist
6 Assisted in the
development of the Site
Suitability Analysis Tool
(SSAT) for well siting
6 Field experience and
familiarity with well siting
—helping to provide more
accurate field data and
refine siting criteria
KEY QUALIFICATIONS...
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City of Whittier: Well No 8 Rehabilitation and Relining Nicolette is part of a team that provided hydrogeologic services, performed/supervised well rehabilitation efforts, and is currently supervising the installation of a casing liner and the equipping of the submersible pump. Nicolette provided field supervision of the contractor’s activities, and permitting support that included preparation of updated final DWSAP documents.
Olivenhain Municipal Water District: San Dieguito Groundwater Desalination Project For this project, Nicolette calculated return flow of imported vs. native water to the watershed and groundwater basin in support of the modeling team using geospatial analysis. She also complied, georeferenced, and analyzed water meter data for four (4) different water providers over a 20 year period. Additionally, she used aerial imagery to classify crop types and groundcover to calculate the return flow for un-metered areas.
Independent Well Drilling: Subsidence Evaluations for Multiple Wells Nicolette provided permitting support for multiple wells in Southern California to comply with Executive Order N-7-22 by evaluating the potential for each well to cause subsidence or adverse effects to existing infrastructure. For the project, she collected and analyzed historical well records and production data; generated missing production data using historical aerial imagery and crop demands; and obtained and processed InSAR data to evaluate land surface elevation change against historical seismic activity and precipitation.
Various Clients: Drinking Water Source Assessment and Protection (DWSAP) Program Nicolette works with several client to provide hydrogeological services for DWSAP programs. She has provided DWSAP reports for multiple clients including the City of Ontario, Rancho California Water District, and Bellflower-Somerset Municipal water Company. In conjunction, Nicolette also worked with the SWRCB Department of Drinking Water to ensure compliance of current assessment procedures.
CADIZ Inc.: Three New Agricultural Wells
Nicolette provided supervision for the drilling, construction, development, and testing of three (3) new agricultural wells. She contributed to field efforts by logging lithology samples, performing mechanical grading analysis, recording field data, and collecting water quality samples, as well as assisted with the final summary report and figures.
Rancho California Water District: Monitoring Well No. 512 and Production Well No. 172 Nicolette provided supervision for the drilling, construction, development, and testing of a monitoring well and production well using air rotary casing hammer, direct mud, and reverse mud rotary methods.
She contributed to field efforts by logging lithology samples, performing mechanical grading analysis, recording field data, and collecting water quality samples, as well as completing the DWSAP assessment after the completion of the wells.
Nicolette Nguyen
Associate Geohydrologist
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Years of Experience: 4
Years with Geoscience: 4
Education and Professional Registrations/Certifications:
6 BS, Environmental Environmental Geoscience, Brigham
Young University-Idaho
Calvin Anderson has nearly five years of experience
supporting our modeling team in the development of
groundwater models and conducting model runs for a variety of groundwater resource projects. His experience has included organizing and interpolating water quality data to create three model layers to calculate initial Nitrate and TDS concentrations for an integrated model of the Upper Santa Ana River Basin, as well as creating nitrogen loading criteria based on land use and recharge volume. Calvin has also supported modeling efforts in the completion of a Groundwater Sustainability Plan for the Arlington Basin, identifying potential areas of improvement in the model results and updating and creating files for model runs. Calvin is a graduate of BYU-Idaho where he created one of the first groundwater flow models of the Teton basin in Idaho. Additionally, he worked with the Idaho National Laboratory as a hydrologic technician to collect field data and collect groundwater samples.
Summary of Experience:
Rancho California Water District: Mid-Pauba Valley Recharge Calvin supported modeling efforts to evaluate multiple scenarios investigating effects of additional artificial recharge in proposed recharge basins for various scenarios to determine which resulted in the highest sustainable yield of groundwater while not causing flooding near the project area. This involved updating model packages and processing results to determine change in groundwater level, depth to water, and a water budget of the hydrologic subunit Western Municipal Water District: Victoria Basin Recharge Project Calvin updated the integrated model of the Upper Santa Ana River Basin to investigate the impacts of recharge at the Victoria recharge basins and ensure model calibration with updated inputs. This included analyzing precipitation information to find analogous periods within the historical model inputs as well as adding updated pumping volumes for recent pumping and comparing model results to measured water levels.
Jurupa Community Service District: Etiwanda Pipeline Well Siting In support of agreements with neighboring water districts to diversify their water sources, Calvin organized GIS data and created a GIS based site suitability assessment tool to facilitate the efficient identification of optimal well locations in a groundwater basin with diverse water quality concerns and many existing wells owned by various agencies and individuals.
Cadiz: On Call-Services
Calvin updated the Cadiz model to reflect current wells and pumping levels and created two model scenarios to estimate interference at existing wells and the migration of a nearby saline/freshwater interface
Rainbow Municipal Water District: San Luis Rey Valley Groundwater Recovery Project To help investigate the feasibility of recapturing return flow from distributed water via groundwater modeling, Calvin organized GIS data and created a GIS based site suitability assessment tool identify Calvin Anderson
Associate Modeler
6 Experience supporting
groundwater models and
field data collection—
helping to provide more
accurate and
thorough models and
studies
KEY QUALIFICATIONS...
gssiwater.com A-47
optimal potential well locations as well as potential locations for water treatment plants.
Rancho California Water District: Pauba Valley Recharge Calvin organized GIS data and created a GIS based site suitability assessment tool identify ideal potential locations for recharge basins and provide a framework to easily identify potential locations for future projects. He also supported modeling efforts through creating model files and processing model results of scenarios that were developed with assumptions that utilized in part results from the site suitability assessment tool.
South Coast Water District: Doheny Beach Slant wells
Using GIS tools, Calvin supported efforts to plan slant wells by investigating and interpolating bedrock elevations, as well as analyzing land surface and bedrock elevations along transects for potential slant wells and investigating the possibility for these potential wells to intersect an ocean outfall pipeline.
California American Water Company: Monterey Peninsula Water Supply Project The Monterey Peninsula Water Supply Project (MPWSP) will provide up to 6 million gallons per day (24,227 m3) of desalinated water to relieve pressure on the local groundwater aquifer. Calvin has provided support for this project through utilizing GIS tools to chart land surface elevations along transects to assist with the creation of cross sections, as well as investigating pumping and injection volumes from wells in several superfund cleanup sites in the project area.
Water Systems Consulting: Salt and Nutrient Management Plan for Upper Santa Ana Basin Area Watershed Groundwater Basins
In order to assist in the creation of a SNMP for the Upper Santa Ana Basin Area, Calvin updated the integrated model of the Upper Santa Ana River Basin Watershed groundwater basins, specifically in the SBBA area. This update included updating pumping, as well as investigating and integrating water quality components, specifically TDS and Nitrate, to determine impacts from several potential future scenarios to ensure continued acceptable groundwater quality in the SBBA.
Yuima Municipal Water District: Upper San Luis Rey Valley Groundwater Sustainability Plan The Upper San Luis Rey Valley Groundwater Subbasin, located in San Diego County, extends from the confluence of the San Luis Rey River and Paradise Creek, continuing downstream through Pauma and Pala valleys, ending at the Monserate Narrows. Calvin assisted in the collection and compilation of existing data to create and calibrate a groundwater model in order to support the completion of the GSP and annual reports, including annual change in storage calculations.
San Bernardino Valley Municipal Water District: Santa Ana River Integrated Model Calvin supported efforts to create an integrated model of the Upper Santa Ana River Basin. The support he provided included organizing and interpolating water quality data to create three model layers to calculate initial Nitrate and TDS concentrations. Calvin also created nitrogen loading criteria based on land use and recharge volume.
Western Municipal Water District: Arlington Basin Groundwater Sustainability Plan The Arlington Basin underlies the City of Riverside, which receives virtually all its water supply from local groundwater. Calvin supported modeling efforts to complete the GSP including identifying potential areas of improvement in the model results and updating and creating files for model runs.
San Bernardino Valley Municipal Water District: Modeling Services for Groundwater Model Enhancements
Calvin organized and interpolated water quality data to create initial concentration of Nitrate and TDS in three depth ranges using kriging.
Rancho California Water District: CWRMA Model Update and Enhancements Calvin supported efforts to update and improve the CWRMA model. He updated hydrographs based on model-simulated data, created water level calibration targets, and is currently assisting with model calibration.
Calvin Anderson
Associate Modeler
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San Bernardino Municipal Water District: Recharge Tests and Index Wells in the Riverside North Basin
Calvin supported efforts to complete recharge tests and assess index wells in the Riverside North Basin.
He updated and created files for predictive model runs and helped develop reports detailing model results.
Idaho Department of Natural Resources: Nitrates in Ashton, ID - Analysis and Model of Groundwater Contamination*
Calvin used data collected previously by students and the Idaho Department of Water Resources to look at potential sources of groundwater with nitrate using ArcGIS Pro and Visual MODFLOW Flex.
The project included creating one of the first groundwater flow models of the Teton Basin aquifer, collecting all data from on-line sources, analyzing probable sources of nitrate contamination in a region with heavy agricultural use, identifying the two largest contributors of excess nitrogen, preparing report and presenting results in a school conference USGS Idaho National Laboratory: Student Contract Hydrologic Technician* Calvin worked with the USGS National Laboratory to collect hydrologic data including more than 300 water level measurements for to develop quarterly water level reports. He also worked with other technicians to collect and preserve water samples from more than 50 wells and surface water sites to analyze chemical, sediment, and biological characteristics. Part of the project required organizing large data sets consisting of thousands of data points. Calvin managed the data and organized them into tables and charts to reporting purposes. Calvin also used ArcGIS Pro to create maps for each of the 200 active well sites used to collect data. Finally, Calvin helped accelerate database cleanup and digitized more than 1,000 records.
*Projects prior to Geoscience
Calvin Anderson
Associate Modeler
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Years of Experience: 6
Years with Geoscience: 1
Education and Professional Registrations/
Certifications:
6 PhD, Forestry and Natural Resources, West Virginia
University, West Virginia
6 MS, Geology (Specialization: Hydrogeology), Bowling
Green State University, Ohio
6 MS, Geology (Specialization: Hydrogeology), University of Dhaka, Bangladesh
6 BS, Geology, University of Dhaka, Bangladesh
Bidisha Fifer is an associate modeler performing
hydrogeological modeling, geospatial analysis, and
assisting in the analysis of water quality and contaminant transport. She has five years of academic research experience modeling scenarios, groundwater flows, and basin water
quality. Bidisha’s experience also includes assisting in the development of a focused groundwater model, performing
modeling and running scenarios, preparing modeling results for reporting, data collection, model review and validation, analyzing water quality modeling results, developing
assumptions for the modeling scenarios, and assisting in the refinement of groundwater models.
Summary of Experience:
San Bernardino Valley Water Conservation District:
Modeling & Technical Support for Plunge Creek and
Oak Creek
Bidisha F. Fifer, MS, PhD
Associate Modeler
6 Experience supporting and
performing groundwater
modeling — assisting in
the analysis of water quality
and contaminants
6 Proficient in Geospatial
analysis and modeling
– ability to display and
communicate complex
aerial distributions and
information
6 Skilled in multiple software
platforms including
MODFLOW, MT3DMS, SWAT,
MODPATH, ArcMap, Python,
Jupyter, Docker, etc.
KEY QUALIFICATIONS...
The Plunge Creek Conservation Project’s goal is to restore Plunge Creek back to a naturally braided stream system using natural processes and hydrology, increasing habitat for the endangered San Bernardino kangaroo rat, and allowing the water to spread out and infiltrate into the ground to recharge the basin. Bidisha is part of a team responsible for developing a focused model and performing groundwater modeling for this project to study the potential recharge capabilities of the area.
City of Santa Monica: Coastal Desalination Study
The City of Santa Monica is currently studying possible desalination efforts to supplement water supplies. Bidisha was responsible for assisting in the development and calibration of a local groundwater model, as well as running modeling scenarios and assisting in the analysis of projected pumping.
San Bernardino Valley Municipal Water District: Well Siting & Water Quality Analysis for SARCCUP and YVWD/SGPWA Conjunctive Use Plan
Bidisha assisted in the preparation of the Conjunctive Use Plan for the Santa Ana River Conservation and Conjunctive Use Plan (SARCCUP) and Yucaipa Valley Water District/San Gorgonio Pass Water Agency (YVWD/SGPWA) to study and define water banking and recovery capabilities in the region.
Groundwater modeling was performed to help stakeholder groups analyze the projects and understand CUPP impacts and benefits.
gssiwater.com A-50
San Bernardino Valley Water Conservation District: Modeling & Technical Support for Waterman Lynnwood Twin Creek Project
Bidisha is part of a team responsible for performing groundwater modeling and focused model refinement for the Waterman/Twin Creek Diversion project.
West Virginia University, Division of Plant and Soil Science: Graduate Research Assistant* In this role, Bidisha coordinated quarterly field and lab work for the Mid-Atlantic Sustainable Biomass for Value-added Products Consortium (MASBio). She was also responsible for analyzing soil water nitrate concentrations concerning applied treatments using statistical methods. ,In addition, Bidisha analyzed water and nutrient flow dynamics in the Appalachian region of West Virginia employing a combination of field monitoring, observed data analysis and hydrological modeling methods. She has also performed predictive modeling studies to analyze the potential sensitivity of climate change on mountainous watersheds.
Indiana University, Department of Earth and Atmospheric Sciences, Associate Instructor / Graduate Research Assistant*
As a research assistant, Bidisha performed hydrological modeling to analyze the water quality of Wabash Basin, Indiana, and performed hydrological modeling of the Wabash Basin related research. In addition, Bidisha was responsible for spearheading the efforts to develop a gateway for publishing the results of the study.
Publications:
Abesh, B. F., Anderson, J. T., & Hubbart, J. A. (2024). Surface Water (SW) and Shallow Groundwater (SGW) Nutrient Concentrations in Riparian Wetlands of a mixed Land-Use Catchment. Land, 13(4), 409.
Abesh, B. F., Anderson, J. T., & Hubbart, J. A. (2024). Using MODFLOW to Model Riparian Wetland Shallow Groundwater and Nutrient Dynamics in an Appalachian Watershed. Water, 16(13), 1772.
Abesh, B. F. & Hubbart, J. A. (2023). A Comparison of Saturated Hydraulic Conductivity (Ksat) Estimations from Pedotransfer Functions (PTFs) and Field Observations in Riparian Seasonal Wetlands. Water, 15(15), 2711.
Abesh, B. F., Jin, L., & Hubbart, J. A. (2022). Predicting Climate Change Impacts on Water Balance Components of a Mountainous Watershed in the Northeastern USA. Water, 14(20), 3349.
Abesh, B. F., Liu, G., Vázquez-Ortega, A., Gomezdelcampo, E., & Roberts, S. (2022). Cyanotoxin transport from surface water to groundwater: Simulation scenarios for Lake Erie. Journal of Great Lakes Research, 48(3), 695-706.
*Projects prior to Geoscience
Bidisha F. Fifer, MS, PhD
Associate Modeler
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Years of Experience: 5
Years with Geoscience: 3
Education and Professional Registrations/Certifications:
6 BS, Earth Science; Geohydrology, University of California, Santa Barbara
Matthew McComb has three years of experience supporting our modeling team specializing in the collection and
evaluation of geological, hydrogeological information, in combination with spatial data. His experience has included maintaining GIS databases and using these tools to display complex aerial distributions and transform complex
information into easy maps and figures, as well as preparing environmental compliance plans, permits, and reports for contaminant analysis, land use, and groundwater. Matt has also performed field work including data collection and sampling, drilling, well installation, system maintenance, aquifer testing, and construction oversight.
Summary of Experience:
California American Water Company: Monterey
Peninsula Water Supply Project
The Monterey Peninsula Water Supply Project seeks to install desalination slant wells in the Monterey area. Geoscience’s modeling team provides legal support constructing
groundwater and water quality models (collectively known as versions of the North Marina Groundwater Model) in an ongoing lawsuit between the City of Marina and Marina
Coast Water District (MCWD) vs California American Water Company (client). For this project, Matt is responsible for updating model inputs for precipitation, recharge basins, agricultural pumping, inflows and outflows on the model boundaries, model layer elevations, initial conditions, as well as calibrate the model by matching model outputs to known measurements. In addition to construction and calibration, Matt is also responsible for running predictive scenarios and analyzing the results to investigate potential impacts of the slant wells to the surrounding basins’ water levels and water quality. This takes the form of drawdown contours from slant well pumping after many years as well as contours of seawater intrusion after many years to give a reasonable estimate of what the impacts of the project should be going into the future.
Best, Best and Krieger LLP: Safe Yield for Indian Wells Valley Project Modeling project to establish the safe yield for the Indian Wells Valley Groundwater Basin, where a local mineral company wishes to establish and maintain their water rights. Matt is responsible for the quality check, maintenance, and updates to a database of freshwater pumping for this company, as well as construct multiple graphs and explanatory figures to convey how the company’s complex history relates to its historical pumping. The database contains thousands of records in various formats ranging from monthly, weekly, and daily pumping reports written by various source companies that have changed hands over the years to more recent excel spreadsheets that have more explicit rates and dates associated with wells.
Western Municipal Water District: Santa Ana River Enhanced Recharge Project Western Municipal Water District wanted to update the Integrated Santa Ana River Model (ISARM) Matthew McComb
Associate Modeler
6 Experience supporting
groundwater models and
field data collection—
helping to provide more
accurate and
thorough models and
studies
6 Proficient in GIS mapping
and database support—
ability to display and
communicate complex
information and aerial
distributions
KEY QUALIFICATIONS...
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to include new basins that have been recently constructed and caused groundwater mounding in the immediate downgradient area. Matt was responsible for recalibration of the ISARM to the new measured water levels by altering specific yield and hydraulic conductivity, rerouting the inflows of the streamflow routing package to geographically precise locations, and heavily reworking the implementation of how the recharge basins had previously functioned within the model to more accurately reflect ground truth conditions.
Numeric Solutions: Junior Staff Geologist & GIS Technician* While in this role, Matt supervised all phases of water well construction to maintain stringent compliance with the design standards and performed in-depth geohydrology studies by analyzing data acquired from public resources, using geo-referenced geologic maps to assess prospective well construction, and estimating expected production. In addition to these responsibilities, Matt operated, maintained, and installed transducers, communicators, and field equipment to ensure data integrity, while also collecting surface- and groundwater samples and data on river discharge, as well as assisted in formulating land use permits for several agricultural projects and regulatory compliance. As a GIS Technician, Matt resolved GIS problems by translating large-scale raster, geodatabase, and shapefile data into spatial analysis, contours, and grid data.
Geological Survey of Israel: Hydrology Intern*
During a geological survey of Israel, in Jerusalem, Matt identified the causes of seawater intrusion and carried out a six-week study of the Dead Sea, coastal aquifers, and pertinent groundwater mechanics using salinity and isotope concentration tracing. He collected and tested water samples from the North Dead Sea region to analyze pothole formation risks as a consequence of underground salt dissolution. *Projects prior to Geoscience
Matthew McComb
Associate Modeler
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Appendix B:
Detailed Project Descriptions
gssiwater.com B-1
The project is part of a planned mixed use development
and adjacent to agricultural areas
The Oak Valley Town Center is a planned,
large-scale, mixed use development that
initially planned to spread recycled water
using decorative lakes. However, our
investigations found that recharge via
spreading basins was not feasible and that
artificial recharge using injection wells was
best suited to the site geology.
Geoscience initially completed a study to
help determine recharge pond location and
quantify the amount of water that could
be recharged by each pond. The study
developed a three-dimensional (3D) lithologic
model based on the available data and wells
constructed in the area to identify potential
recharge pond locations. We also completed
seismic reflection surveys to determine the
location of any geologic faults in the area that
would prevent groundwater discharge.
Based on study results, we identified a
test pond location to determine the best
placement for
the recharge
basins. To assess
the recharge
potential in
the ponds,
we installed
monitoring wells
and installed
instrumentation
to determine
recharge
rates. We
also designed
and installed
automatic flow
control and
Oak Valley Town Center Recharge Project
Yucaipa, California
SCADA systems for the test pond to collect
data remotely in real time. Our team used the
automated system to access site data on-line
to calculate recharge potential.
Based on the test data, we discovered that
percolation ponds likely would not recharge
enough water, making injection wells the
preferred option. We then completed
modeling to assess the effectiveness and
impact of injection wells. Based on the
modeling results, we have recommended
injection well locations and completed
exploratory drilling to develop injection well
designs. Our team is currently working on the
injection well and extraction (recovery) well
designs.
Geoscience worked
closely with Yucaipa
Valley Water District
to investigate and
refine the most
effective recharge
option. Our staff
completed extensive
field investigations
and conducted both
infiltration testing and
exploratory drilling.
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Groundwater Sustainability Plan for the Upper San Luis Rey Valley Yuima, California
In 2014 Governor Jerry Brown signed the
Sustainable Groundwater Management Act
(SGMA), providing California with a framework
for sustainable groundwater management for
the first time in its history. Recognizing that
groundwater is most efficiently managed at
the local level and each groundwater basin is
different, the intent of SGMA is to facilitate
and strengthen local control and management
of groundwater basins.
Since the Upper San Luis Rey (USLR) Valley
Groundwater Subbasin which includes the
Pauma and Pala basins, is a low-priority
basin, the Pauma Valley GSA was formed and
tasked with developing and implementing
a Groundwater Sustainability Plan (GSP).
The Pauma Valley GSA consists of Yuima
Municipal Water District, Pauma Municipal
Water District, Pauma Valley Community
Services District, San Luis Rey Municipal Water
District, and the Upper San Luis Rey Resource
Conservation District. The goal of the GSP is
to ensure that groundwater continues to be
available to everyone who uses it far into the
future.
Geoscience prepared the GSP for the Pauma
Valley GSA that included an introduction to
the GSP, including objectives and organization
of the GSP; a description of the geographic
setting, including existing water resources
planning and programs, relationship of
the GSP to other general-plan documents
within the basin area, and additional GSP
components (land use plans, well and project
permitting processes, etc.); and a description
of the physical components of the USLR Valley
Groundwater Subbasin.
Geoscience also provided a hydrogeologic
conceptual model for the understanding of
groundwater conditions in the subbasin and
development of groundwater budgets through
construction and calibration of an integrated
surface water and groundwater model. The
plan includes a description of the sustainability
goals set by the GSA, that included
undesirable results (URs), minimum thresholds
(MTs), measurable objectives (MOs), and
interim milestones (IMs). In addition to the
sustainability goals, our team provided a
framework to achieve the sustainability goal
for the USLR Valley Groundwater Subbasin
by listing potential management actions and/
or projects that may be utilized to ensure
long-term sustainability, mitigate potential
undesirable results, and potentially increase
sustainable yield of the subbasin. The plan also
included a description of the initial monitoring
network established and monitored during
development of the GSP, recommendations
for modifications to the monitoring
network following GSP implementation,
an evaluation of impacts from proposed
projects and management actions, and an
outline for monitoring protocols and field
sampling procedures once the plan has
been implemented. The GSP also includes
an implementation plan that describes the
process, including estimated costs, sources of
funding, a preliminary schedule, methodology
for annual and five-year reporting, and how
progress evaluations will be made over time.
Geoscience was also responsible for the design
and construction of two (2) monitoring wells
to fill data gaps within the Pauma subbasin of
the San Luis Rey Groundwater Basin, thereby
increasing the hydrogeologic understanding of
the area and providing important information
on specific conditions for future inclusion to
updates of the District’s GSP.
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Well Rehabiliation
The Elsinore Valley Municipal Water District
was founded in 1950 and provides water
service to the City of Lake Elsinore and
surrounding communities. Currently, the
District serves more than 45,000 water,
wastewater, and agricultural connections.
Since 2016, Geoscience has worked closely
with the EVMWD on a number of wellrelated projects, including the assessment, construction management, and field
supervision of ten (10) well rehabilitation
and redevelopment projects, test borehole
drilling at two (2) unique potential well sites
(i.e., Warm Springs and Lee Lake areas), and
construction management, design, and field
supervision of two (2) new groundwater
production wells near Lee Lake.
In addition, Geoscience has provided
assistance to the District with pump failure
issues related to the Diamond well, provided
peer review of well design and pump design
for the Palomar Well, performed inspection
and recommendations for the Lincoln Well,
and assisted with pump failure issues at the
Summerly Well. Our team is currently looking
to address pump issues with the Flagler Wells.
Well rehabilitations and redevelopment
projects to date include:
Flagler Wells 2A & 3A Cereal Wells 1 & 3
Terra Cotta Well Summerly Well
Diamond Well Mayhew Well
Machado Well Joy Street Well
Exploratory Drilling & Lee Lake Well Nos. 1 & 2
As part of their near-term water supply
program, EVMWD wished to develop
resources in the Lee Lake Basin to meet
an anticipated demand increase due to
rapid growth. The intent was to optimize
groundwater resources to increase the potable
supply, while also reducing dependence on
imported water sources. One project for
this program was the drilling and testing of
suitable sites previously identified for two new
groundwater production wells.
After identifying a suitable location for the
drilling and testing of two new groundwater
production wells, a test borehole was drilled
to verify the site suitability by use of the
air rotary casing hammer (ARCH) drilling
method - used due to the poorly consolidated
coarse-grained alluvial material in which the
borehole was drilled. Once the total depth of
the borehole was achieved, drilling mud was
introduced to the borehole, the casing was
removed, and a suite of geophysical logs was
performed. Based on the data obtained from
the investigation, a very accurate preliminary
design of the production wells was developed.
This test borehole was one component of a
much larger, multi-phase project throughout
the EVMWD service area. Geoscience was
responsible for the development of a work
plan for the test drilling, field inspection during
drilling and testing, and the development of
the preliminary well designs for the municipal
groundwater supply wells.
Geoscience then provided final design,
construction management, and observation
support for the two new groundwater
production wells – referred to as Lee Lake
Well Nos. 1 and 2. Once the final design
was completed, Geoscience staff provided
bid support, construction management
and observation to drill the initial borehole
and complete isolated aquifer zone testing.
Based on the results of the zone testing, we
completed the final design and observed well
completion including well development by
airlifting and swabbing, aquifer testing, and
final down-hole video inspection.
Elsinore Valley Municipal Water
District, Well Rehabilitation and
New Well Construction (Lee Lake
Well Nos. 1 & 2)
Lake Elsinore, California
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Groundwater Monitoring and Reporting for the Cadiz Water Project Cadiz, California
The Cadiz Water Project aims to supply
50,000 acre-feet annually to the various
Southern California areas, particularly
aiding disadvantaged areas. In 1997 the
County of San Bernardino approved the
initial Groundwater Management Plan
for the agricultural side or the Cadiz, Inc.
(Cadiz). Santa Margarita Water District
has since taken charge of environmental
compliance, culminating in the endorsement
of the updated Groundwater Management,
Monitoring, and Mitigation Plan (GMMMP) in
2012. This revised plan, which surpasses the
original in scope, particularly in its monitoring
requirements, marks a strategic shift from
agricultural groundwater use to the project’s
demands. The report not only adheres to
the initial monitoring protocols but also
integrates enhanced oversight mechanisms
in anticipation of a full transition to the new
management guidelines. Complementarily,
the Geoscience team has provided various
services including extensive hydrogeologic
studies and environmental assessments have
been conducted to understand and mitigate
the project’s impacts on local ecosystems and
groundwater resources, thereby supporting
the project’s advancement and regulatory
compliance. Currently We are updating the
Monitoring Plan working collaboratively with
a Technical Review Pannel which is made up of
representatives from the County, Lead Agency
of the EIR and the Mutual Water Company.
Some of these studies have been to map and
test the various hard-rock aquifer systems of
the fanglomerates, carbonates, and fractured
Jurassic granitics for production potential.
Since 1997, the Geoscience team has
significantly contributed to the continuous
and growing monitoring efforts for the
Project. Our team has developed and
implemented groundwater monitoring
protocols along with design and field
oversite for monitoring and production
wells.
The wells are all equipped with pressure
transducers providing a continuous record
of water level and conductivity data and 49
monitoring wells (8 of which have pressure
transducers), which are located within
three (3) watersheds across approximately
2,000 square miles. Geoscience staff
visit each site quarterly to collect hand
water level, transducer data and select
water quality samples. Our team also
performs visual observations of various
springs throughout the area. Water quality
isotopes, and surface wetting fronts are
among the monitoring efforts associated
with the springs. Geoscience conducts
regular maintenance of all the monitoring
points every quarter.
6 Transducer cleaning
6 Inspection and repair of monitoring
wells
6 Repair or replace sounder or transducer
cables
In compliance with the GMMMP land
surface monitoring is also required each
year to help track any potential subsidence
Site Map and Monitoring Feature associated with pumping. Geoscience Water Level Monitoring Hydrographs
gssiwater.com B-5
assists Cadiz in contracting surveyors each
year to perform land surface monitoring. We
also review the State’s InSAR data to further
assist in this analysis.
Quarterly water quality samples are collected
from all the pumping wells and a select
monitoring wells up- and down-gradient of
the wellfield. Water quality sampling of the
monitoring well network have been collected
since 1997.
Geoscience processes the collected
monitoring data and prepares annual and
cumulative five-year (5 yr.) groundwater
monitoring reports which are submitted to
the County of San Bernardino. The five-year
(5 yr.) reports compare and analyze changes
for the last five (5) years. These also require
reanalysis of storage and recharge values
for the aquifer system. The transducer data
requires processing before it can be plotted
using the instruments software. Water levels
are compensated for barometric effect using
local barometric data and conductivity values
are normalized to specific conductivity values
(conductivity at 25 degrees C). Groundwater
level and conductivity data are plotted and
presented in the project reports.
Our team members have designed and
provided construction oversight of nine (9)
high-capacity production wells for agricultural
operations and drilled and completed the
design of a high-capacity (over 3,000 gpm)
combo well. This well was drilled and tested in
both alluvium and carbonate formations (well
design is the figure on the left). In concert
with the production wells, monitoring wells
were drilled and completed in the various
hard-rock units to help understand the various
aquifer properties in those units as along with
the Carbonate and alluvial aquifers. Another
well was located and designed to perform a
pilot recharge test which concluded that the
material would
be perfect
for surface
spreading.
Each of the
wells were
designed
with custom
louvered
screens and
filter pack
based on the observed and analyzed borehole
lithologic samples collected during the drilling
phase. The wells were then developed and
tested to understand the well efficiency
and aquifer parameters at each location.
Geoscience has continued to collect daily
groundwater level and quarterly water quality
data in all pumping production wells providing
more than 20 years of data representing both
wet and dry hydrologic periods.
Geoscience continues to provide as-needed
expert opinion and assistance as requested
by Cadiz review team to aid in clarifying and
presenting complex technical information in
one of the most stringent monitoring plans in
all of California.
Pilot Recharge Basin
Screenshot of Cavernous Carbonates
Fully Saturated
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FOUR WELL CONDITION ASSESSMENT & REHABILITATION
Anaheim, California
Anaheim Public Utilities selected PACE to
evaluate four existing water wells and identify
rehabilitation options as part of the City’s
plans to improve their groundwater treatment
program. In response to the discovery of
per- and polyfluoroalkyl substances (PFAS) in
local groundwater, the City is in the process of
determining the most effective and efficient
deployment of PFAS treatment systems. Wells
39, 47, 48, and 53 are between 20 and 45
years old, and it is suspected that the casings
may have begun to deteriorate.
As a subconsultant to PACE, Geoscience
conducted a well condition assessment
for APUC Well Nos. 39, 47, 48, and 53 to
evaluate their current operational status
and recommend necessary rehabilitation
measures. The assessment revealed significant
declines in well efficiency, with all wells
experiencing at least a 50% reduction in
specific capacity due to screen plugging,
mineral deposits, and biofouling. Well No.
47 showed the most severe efficiency loss
at 70%, suggesting advanced well plugging.
Preliminary downhole video surveys
identified moderate bacteriological activity
and scale deposits on the well screens and
casing, though no major structural failures
were observed. However, Well No. 39 could
not be fully inspected due to access tube
obstructions. Additionally, PFAS contamination
was confirmed in all wells, necessitating future
treatment considerations. Water level data
suggested stable static levels, but pumping
levels have shown increasing drawdown,
further indicating declining well performance.
Based on these findings, PACE and
Geoscience recommended a comprehensive
rehabilitation program for all wells, including
mechanical brushing, chemical treatment,
and redevelopment to restore hydraulic
efficiency, as well as phased approach with
multiple video inspections throughout
the rehabilitation process to ensure the
effectiveness of the treatments. Postrehabilitation aquifer testing was also advised to assess recovery efficiency, and a longterm maintenance and monitoring program was recommended to be implemented to
track well conditions and optimize future
rehabilitation schedules.
Geoscience is currently preparing bid
documents and technical specifications for
rehabilitation efforts for the four wells and will
also oversee rehabilitation and redevelopment
efforts in the field.
Anaheim Well No. 48
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Water Supply Well No. 22
Vernon, California
PACE prepared plans and specifications for
the City of Vernon so their newly drilled
water well could provide up to 2,100 gpm
of potable well water into their existing
distribution system. The pump is driven by
a 400-horsepower motor, and the wellhead
is covered with a removable enclosure to
protect the equipment. In addition, the City’s
material and specification preferences were
incorporated to assist with standardizing
equipment throughout the City. The site
layout is very small and narrow, so the
design satisfied Low Impact Development
(LID) requirements by limiting the newly
impervious area to less than 5,000 feet. Piping
and valves were designed so that the site
could accommodate steel treatment tanks for
future wellhead treatment.
PACE suspected that 2,000 linear feet of
the existing cast iron distribution piping, to
which the new 12-inch discharge pipe would
connect, had tuberculation and would create
excess pressure buildup if the new well
operated at full capacity. PACE implemented
a physical flow test and validated that the
existing pipe lost over half of its capacity. As a
result, the existing 10-inch cast iron pipe was
replaced with a new 12-inch ductile iron pipe.
Vernon Well No.22
gssiwater.com
Geoscience Support Services, Inc.
Services Agreement