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2008/01/08 City Council Resolution 2008-04RESOLUTION NO. 2008 -04 A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF ROHNERT PARK AUTHORIZING AND APPROVING THE THIRD AMENDED COOPERATIVE AGREEMENT BETWEEN AND AMONG THE SONOMA COUNTY WATER AGENCY, THE COUNTY OF SONOMA, THE CITIES OF COTATI, ROHNERT PARK, SANTA ROSA, AND SEBASTOPOL, THE TOWN OF WINDSOR, AND CAL AMERICAN WATER COMPANY TO PROVIDE FUNDING AND SUPPORT INFORMATION FOR THE SANTA ROSA PLAIN GROUNDWATER STUDY WHEREAS, on April 13, 2004, the City Council of the City of Rohnert Park approved Resolution No. 2004 -90 approving letter from the City to the Sonoma County Water Agency ( "SCWA ") to state its interest in participating in the Santa Rosa Plain Groundwater Study with SCWA and other agency participants; WHEREAS, Resolution No. 2005 -48 was adopted by Council on February 22, 2005, approving the original Cooperative Agreement to Provide Funding and Support Information for the Santa Rosa Plain Groundwater Study; WHEREAS, on October 24, 2006, Council adopted Resolution No. 2006 -254 authorizing the First Amended Cooperative Agreement to provide funding for the second year of the study; and WHEREAS, Resolution No. 2007 -54 was adopted by Council on April 10, 2007, authorizing the Second Amended Cooperative Agreement to fund additional second year work proposed by the United States Geological Survey ( "USGS "). NOW THEREFORE BE IT RESOLVED by the City Council of the City of Rohnert Park that it does hereby authorize and approve the Third Amended Cooperative Agreement between and among the Sonoma County Water Agency, the County of Sonoma, the Cities of Cotati, Rohnert Park, Santa Rosa, and Sebastopol, the Town of Windsor, and Cal American Water Company to provide funding and support information for the Santa Rosa Plain Groundwater Study. BE IT FURTHER RESOLVED that the Mayor is hereby authorized and directed to execute this amended agreement in substantially similar form to the attached agreement for and on behalf of the City of Rohnert Park. DULY AND REGULARLY ADOPTED this 8h day of January, 2008. ATTEST: Ig CITY OF ROHNERT PARK Mayor s Llu IFOilNj�� BREEZE: AYE SMITH: AYE STAFFORD: AYE VIDAK- MARTINEZ: AYE MACKENZIE: AYE AYES: (5) NOES: (0) ABSENT: (0) ABSTAIN: (0) dm: \ \fileserver \data \techw \agremats \sr plain groundwatercoop amended 3.doc version: 12/19/ 2007 293:00 PM TW 03/04 -104C Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study This Agreement is made by, between, and among the Sonoma County Water Agency, ( "Agency'), and the County of Sonoma, City of Cotati, City of Santa Rosa, City of Sebastopol, City of Rohnert Park, Town of Windsor, and Cal American Water Company, a California Corporation, (collectively referred to as "Participants"). RECITALS A. Agency and Participants all utilize groundwater pumped from the Santa Rosa Plain Groundwater Basin ( "Basin') and utilize the Basin for all or part of their municipal water supply. B_ A comprehensive study of the Basin was last completed in 1982 by the Department of Water Resources in cooperation with the Sonoma County Water Agency. C. Agency and the United States Geological Survey ("USGS") have proposed a study to evaluate the groundwater resources of the Basin. The objective of the study is to: (1) develop an updated assessment of the geohydrology, geochemistry, and geology of the Santa Rosa Plain, including: development of a Geographical Information System database, identification of annual pumpage quantities by sub -area, and estimated quantities and locations of annual recharge; (2) develop a multi- aquifer groundwater flow model for Santa Rosa Plain; and (3) evaluate the hydrologic impacts of alternative groundwater management strategies for the Basin. D_ The base cost of the study is estimated to be approximately $2,048,000 over five years and could increase if the scope of work is expanded to include supplemental study activities. USGS has indicated the study may -be eligible for up to $625,000 in federal matching funds over the five -year study period. Assuming the study qualifies for complete matching federal funds, a balance of $1,425,000 would be paid by participating co- funding agencies over the life of the study. E. Agency first entered into this agreement with USGS for the first year of the study, and Participants agreed to share in the funding responsibility for that year pursuant to the terms and conditions of the "Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study' executed by Agency on August 17, 2005 ( "Original Agreement "). F. The purpose of the Original Agreement was to (1) provide a funding mechanism by which approximately $200,000 could be contributed to pay for the first year of the study of the Basin and (2) establish a working relationship among technical staff, together with tools and protocols that will be necessary for the success of additional studies as well as any future groundwater management strategies. G. Since execution of the Original Agreement, Agency and Participants found it desirable to amend the Agreement to provide additional funding for the second year of study as identified herein and executed the First Amended Agreement dated December 14, 2006, in the amount of $333,266_ Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study H. Following technical review and discussion Participants found it desirable to fund additional second year work proposed by the USES, including collection of high - resolution seismic - reflection data in the Santa Rosa Plain, for an additional cost.of $120,000, executed on May 15, 2007, as the Second Amended Agreement. USGS funded $60,000 and Participants funded $60,000, as described in Attachment A of this Agreement_ I. Agency and Participants find it desirable to amend the Agreement to provide additional funding for the third year of study as identified herein, in the amount of $356,307_ J. Agency and Participants agree it is in the public interest to work cooperatively with other entities whose service areas or boundaries overlie the Basin. . K_ Agency and Participants have negotiated a projected cost sharing for the study based on groundwater usage and population served. L_ This Agreement provides for funding the first, second, and third years only and neither Agency nor Participants are obligated to participate in further studies or to provide funds in other years_ M. Upon execution of this Third Amended Agreement by all parties, the Second Amended Agreement will terminate and is superseded by this Third Amended Agreement_ AGREEMENT Agency and Participants agree as follows: 1. RECITALS The above recitals are true and correct. 2. LIST OF ATTACHMENTS AND ORDER OF PRECEDENCE The following attachments are incorporated by reference as though fully set forth herein, and in accordance with the provisions of this Agreement: 1) Attachment A: Cost Allocation 2) Attachment B: Study Description 3) Attachment C: Draft Joint Funding Agreement with USGS 4) Attachment D: Planned Study Work for Federal Fiscal Year 2008 In case of any conflict between the terms of the Agreement and the attachments, the terms of these documents control and prevail in the following order: 1) Agreement, 2) Attachment A, 3) Attachment D, 4) Attachment B, and 5) Attachment C 3. ' COMMUNICATION/DESIGNATED REPRESENTATIVES The persons identified below as the Designated Representative shall, upon execution of this Agreement, have authority to grant discretionary approvals identified in this Agreement. Except as otherwise specifically provided in this Agreement, any notice, submittal, or communication required or permitted to be served on a party, may be served by personal delivery to the person or the office of the person identified below_ Service may also be made by mail, by placing first -class postage, and addressed as indicated below, and depositing in the United States mail to: Agency City of Santa Rosa Project Manager: George Lincoln, P.E. Project Manager: David Guhin PO Box 11628 Utilities Administration, 69 Stony Circle Santa Rosa, California 95406 Santa Rosa, California 95401 Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study 2 Phone: 707 - 547 -1930 Phone: 707 - 543 -4299 . Fax: 707 - 524 -3782 Fax: 707 - 543 -3936 Email: glincoln@scwa-ca.gov Email: dguhin@srcity.org Designated Representative: Randy D. Poole . Designated Representative: Richard Dowd City of Rohnert Park City of Sebastopol Project Manager: Darrin Jenkins, P.E. Project Manager- Susan Kell 6750 Commerce Blvd. Engineering Department, 714 Johnson Street Rohnert Park, California 94928 Sebastopol, California 95472 Phone: 707 - 588 -2243 Phone: 707 -823 -2151 Fax: 707 -588 -2274 Fax: 707 - 8234721 Email: daienkins @r ci .or Email: suekell @sonic_net Designated Representative: Stephen R. Donley Designated Representative: David D. Brennan City of Cotati Town of Windsor Project Manager: Toni Bertolero Project Manager: Craig Scott Winzler & Kelly, 495 Tesconi Circle PO Box 100 Santa Rosa, California 95401 Windsor, California 95492 Phone: 707- 523 -1010 Phone: 707- 838 -5978 Fax: 707- 527 -8679 Fax: 707 - 838 -5830 Email: tonibertolero @w - and -k.com Email: cscott@townofwindsor.com Designated Representative: Terry L. Stubbin s Designated Representative: J. Matthew Mullan County of Sonoma Cal American Water Company Project Manager: John Maitland Project Manager: Andy Soule 2300 County Center Dr. Ste B 100 4701 Beloit Drive .Santa Rosa, California 95403 Sacramento, California 95838 Phone: 707 - 565 -2528 Phone: 916 - 568 -4212 Fax: 707- 565 -2620 Fax: 916- 568 -4286 Email: conjohnm@sonoma-county.org Email: asoule @amwater_com Designated Representative: Phillip Demery Designated Representative: Tom Glover 4. COST SHARING The estimated cost to complete the five -year groundwater study as outlined in this Agreement is $2,168,000_ Participants and Agency shall share in the approximately $200,000 local share Year 1 cost of the study, approximately $393,000 for Year 2, and approximately $356,307 for Year 3 as listed in Attachment A and paragraph 7 and shall, for later years, consider amending this Agreement to provide the additional funding identified in Attachment A. Each Participant shall reimburse Agency as outlined in Attachment A of this Agreement, and Agency will pay USGS under a separate agreement. 5. THE STUDY The study is described in Attachments B and D. 6. AGENCY RESPONSIBILITIES A. Prepare and negotiate a proposed agreement with the USGS to provide funding to support the first year, second year, and third year of the groundwater study in generally the form attached as Attachment C. Renew the USGS agreement annually throughout the study Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study 3 period, provided Agency's Board of Directors determines that adequate Participant support continues. B. Act as liaison with USES, prepare initial GIS data, and provide technical review, project management,. and project coordination. This responsibility includes coordinating any necessary technical review meetings and providing at least quarterly status updates to Participants at such meetings and as needed. C. Coordinate with Participants and assist with data acquisition. D. Agency shall have no obligation to provide funding for the study after Year 1, Year 2, and Year 3 except upon approval of Agency's Board of Directors or amendment of this Agreement. E. Distribute draft copies of any reports received from USGS to each Participant, notifying the Participants of any USGS requirement regarding confidentiality and distribute final copies of any reports received from USES to each Participant. F. Distribute final reports to the public during the term of the study. G. If requested, assist Participants' staff in making any presentations to Participants' governing boards regarding the study. K Maintain complete and accurate records of all transaction in compliance with generally accepted accounting principles for enterprise accounting as promulgated by the American Institute of Certified Public Accountants and the Governmental Accounting Standards Board. Maintain complete project files with all correspondence, including letters and meeting notes. Such records shall be available to each Participant at all reasonable times for inspection and analysis. 7. PARTICIPANT RESPONSIBILITIES A. Year 1: Within 30 calendar days of notification by Agency that Agency has executed a contract with the USGS for Year 1, each Participant shall deposit with Agency its share for Year 1 of the study cost as described in Attachment A of this Agreement. B. Year 2: Within 30 calendar days of notification by Agency that Agency has executed a contract with the USGS for Year 2, each Participant shall deposit with Agency its share for Year 2 of the study cost as described in Attachment A of this Agreement. C. Year 2 (Supplemental): Within 30 calendar days of notification by Agency that Agency has executed an amended contract with the USGS for Year 2 (Supplemental), each Participant shall deposit with Agency its share for Year 2 (Supplemental) of the study cost as described in Attachment A of this Agreement_ D. Year 3: Within 30 calendar days of notification by Agency that Agency has executed a contract with the USGS for Year 3, each Participant shall deposit with Agency its share for Year 3 of the study cost as described in Attachment A of this Agreement. E. Years 4 through 5: Participants shall have no obligation to provide funding for the study after Year 1, Year 2, and Year 3 except pursuant to amendment of this Agreement. F. Each Participant's Project Manager shall provide technical review and comment on draft work products and study results during the course of the study and shall attend technical review meetings to the extent practicable. The Participants shall maintain the confidentiality of any draft USGS reports to the extent Agency notifies them that such confidentiality is requested by the USGS, subject to Participants' obligations under the California Public Records Act. Each Participant shall make available to Agency, USGS and other Participants all technical data in its possession relevant to the groundwater study. Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study G. Each Participant shall cooperate with Agency efforts to obtain additional funding for groundwater studies. 8. ADDITIONAL REQUIREMENTS A- Authority to Amend Agreement: Changes to the Agreement may be authorized only by written amendment to this Agreement, signed by the Designated Representative of each party or such other representative as is authorized by the governing body of each party. B. No Waiver of $reach: The waiver by any party of any breach of any term or promise contained in this Agreement shall not be deemed to be a waiver of such term or promise or any later breach of the same or any other term or promise contained in this Agreement. C. Construction: To the fullest extent allowed by law, the provisions of this Agreement shall be construed and given effect in a manner that avoids. any violation of statute, ordinance, regulation, or Iaw. The parties covenant and agree that in the event that any provision of this Agreement is, held by court of competent jurisdiction to be invalid, void, or unenforceable, the remainder of the provisions hereof shall remain in full force and effect - - and shall -in-no way lie- a €feeted; impaired, or invalidated thereby. D. Making of Agreement: Participants and Agency acknowledge that they have each contributed to the making of this Agreement and that, in the event of a dispute over the interpretation of this Agreement, the language of the Agreement will not be construed against one party in favor of the other. Participants and Agency acknowledge that they have each had an adequate opportunity to consult with counsel in the negotiation and preparation of this Agreement. E. No Third -Party Beneficiaries: Nothing contained in this Agreement shall be construed to create and the parties do not intend to create any rights in third parties_ F. Applicable Law and Forum: This Agreement shall be construed and interpreted according to the substantive law of California excluding the law of conflicts_ Any action to enforce the terms of this Agreement or for the breach thereof shall be brought and tried in the County of Sonoma. G. Captions: The captions in this Agreement are solely for convenience of reference. They are . not a part of this Agreement and shall have no effect on its construction or interpretation. H. Me —der: This writing is intended both as the final expression of the Agreement between the parties hereto with respect to the included terms and as a complete and exclusive statement of the terms of the Agreement, pursuant to Code of Civil Procedure Section 1856. No modification of this Agreement shall be effective unless and until such modification is evidenced by a writing signed by all parties. I. Time of Essence: Time is and shall be of the essence of this Agreement and every provision hereof. J. Entire Agreement: This Agreement is the entire Agreement between the parties. 9. AGREEMENT BECOMING EFFECTIVE This Agreement shall become effective upon execution by the Agency and all Participants. 10_ TERMINATION Any Participant may terminate its participation in this Agreement by giving one hundred eighty (180) days advance written notice to all other parties of its intent to terminate its participation in this Agreement. Termination shall not relieve the Participant of its obligation to pay costs due before the effective date of the termination. Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study 5 11. COUNTERPART SIGNATURES This Agreement may be executed in counterpart and each of these executed counterparts shall have the same force and effect as an original instrument and as if all of the parties to the - aggregate counterparts had signed the same instrument_ I / I / / I I I / Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study 6 IN WITNESS WHEREOF, the parties hereto have executed this Agreement as set forth below. Reviewed as to substance by County of Sonoma: Department Head Reviewed as to form: County Counsel COUNTY OF SONOMA Chair, Board of Supervisors Attest: CIerk Reviewed as to. funds by Agency: Division Manager - Administrative Services Reviewed as to substance by Agency: Department Head SONOMA COUNTY WATER AGENCY Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study 7 CITY OF SANTA ROSA By: CITY OF COTATI By: Title: City Manager or Designated Representative Attest: CITY OF SEBASTOPOL By: Recording Secretary Approved as to form: Mayor Approved as to form: City of Santa Rosa Attorney CitV of Sebastopol Attorney CITY OF ROHNERT PARK By: TOWN OF WINDSOR By: Mayor Authorized by Resolution No. Attest: Town Manager Attest: Town CIerk City of Rohnert Park Clerk Approved as to form: CAL AMERICAN, WATER COMPANY, a California Corporation By: Tom Glover, General Manager Northern Region City of Rohnert Park Attorney Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study 7 H O W M � o U � H o E-� U N N 1-� O O 0 Q 0 U ..fl rn O G cc cc CO cc cc N r-� nY v O O }J O O U v. CS' N `7 bA ca Tl � v N � 00 CD LO O 00 (dfAl vs. ca ca �ca cz o R .+ 3 0 p c 0 v 0 0 ca (a R v � �. 0 S], r. 04 0 cis "Z lu Tj 00 .�+ c) � � o v 3 L O s o 0 cn Cl r C 0 (a O R O 0 bc o 71 LO w � � y r+ > � O o (a otz O 71 Q) O R w O tx CD LO (Z t - R i3 oN o o O n v � V x * Q Q O F, z cr) 00 CD N O O. --+ N Cl O c0 O- . O r m M N " [� Efl Eii 4tT fh CR 6h w aa O O O O € - O O J.." >~ �; 000 ii O O Chi O i O - O CF} tf) ER Vr •� 110 N N (11 N N N tf) EFT EA Hi "H3 " . ff} Cn U O t N 00 to 3 �0 00 14 m LO M m U LO fAl l� � 1'4 C" ( �, LO LO O 0 N N � " �, m �`� y cv CD _ 00 � N ,- Lo pop i O\ to 00 N to s 0\ i 00 tOf 1 G Ch: L O 6� S.. U4 EA (A- Eh Ui c--� �? 0 k 0 C4 00 C14 00 v 3 cc) to LO ! l� \0 `° O to W Cq r-+ N ro Fh Ch kff Ch c» e» i Q o 00 o - O [ o o 00 i 00 i 00 00 ON U O 00'! t() Ln LO \.O o k Ul - F i 3 s br rd Cl. Oi cZ 00 Oi O cr �+ CO rn w o o co �' at o o 3 0 o \; o s } o \ o \ o - \ Cl. o; p: o. o o U `7 bA ca Tl � v N � 00 CD LO O 00 (dfAl vs. ca ca �ca cz o R .+ 3 0 p c 0 v 0 0 ca (a R v � �. 0 S], r. 04 0 cis "Z lu Tj 00 .�+ c) � � o v 3 L O s o 0 cn Cl r C 0 (a O R O 0 bc o 71 LO w � � y r+ > � O o (a otz O 71 Q) O R w O tx CD LO (Z t - R i3 oN o o O n v � V x * Q Q O F, z ATTACHMENT B Study Description Title: Evaluation of the ground -water resources of the Santa Rosa Plain Cooperating agency: Sonoma County Water Agency (SCWA) Period of project: 2006 -2010 Geographic Scope: The Santa Rosa Plain in Sonoma County. Problem: The Santa Rosa Plain, home to approximately half of the population of Sonoma County, faces growth in population and demand for water. Water supply is provided by a combination of ground water and water delivered via aqueduct from the Russian Rivera Water managers face the challenge of meeting the increasing water demand with a combination of Russian River water, which has uncertainties in its future availability, and local ground -water resources. The water use decisions by the different entities in the Santa Rosa Plain will have an impact on other ground -water users. Water managers need to determine the likely effects of future ground -water development in the Santa Rosa Plain and to identify efficient strategies for surface - water /ground -water management that will ensure the long -term viability of water supply. Objectives: 1) develop an updated assessment of the geohydrology and geochemistry of the Santa Rosa Plain; 2) develop a multi- aquifer ground -water flow model for Santa Rosa Plain; and 3) evaluate the hydrologic impacts of alternative ground -water management strategies for the basin. Relevance and Benefits: The proposed study will provide hydrologic information needed by SCWA, municipalities in the Santa Rosa Plain, and other management and regulatory agencies to better understand the potential impacts of increasing ground -water use on ground -water levels, stream - aquifer interaction, subsidence, and water quality. The study will consider several priority USGS water- resource issues including surface- and ground -water interactions, effects of urbanization on water resources, and hydrologic- system management_ Approach: (1) data compilation, utilizing a Geographic Information System (GIS); (2) new data collection, focusing on water - quality sampling; (3) data interpretation and geohydrologic characterization - including refining hydrologic budgets and updating conceptual models of the ground -water flow system based on the new data and the results of ongoing USGS geologic studies in the basin; and (4) simulation of ground -water flow in Santa Rosa Plain. A set of potentially important additional data collection activities also are presented_ Anticipated products: a summary USGS report (WRIR), a fact sheet, and several journal articles. Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study B -1 Water Resources Availability and Management in Sonoma County, California: Phase 2 -Evaluation of the ground -water resources of the Santa Rosa Plain PROBLEM The Santa. Rosa Plain, home to approximately half of the population of Sonoma County, faces growth in population and demand for water. Water supply is provided by .a combination of ground water and water delivered via aqueduct from the Russian River. Water managers face the challenge of meeting the increasing water demand with a combination of Russian River water, which has uncertainties in its future availability, and local ground -water resources. The water use decisions by the different entities in the Santa Rosa Plain will have an impact on other ground -water users. The two overarching ground -water management questions in the Santa Plain are: 1) What will be the effects of future ground -water development in the Santa Rosa Plain? In particular, the increase in ground -water demand resulting from urban growth and other land use changes will affect water levels, recharge, surface -water discharge, and water quality. Current regional water - quality concerns in the Santa Rosa Plain include iron, manganese, and arsenic. There also is localized contamination from volatile organics such as PCE. Increasing ground -water development may also induce land subsidence. 2) What are efficient strategies for surface - water /ground -water management that will assure the long -term viability of water supply in the Santa Rosa Plain? Historically, individual ground -water users in the Santa Rosa Plain - municipal, agricultural, and domestic -- have proceeded independently in their utilization of ground water_ As pumpage has increased, it is becoming clear that changes in pumpage in one location can have impacts on ground -water conditions elsewhere in the basin. Similarly, Russian River water and ground water have historically been used as separate sources of supply, but not explicitly managed in a linked manner. The increasing water demand, potential reduction in availability of Russian River water, likely Iowering of some maximum contaminant limits (MCLs), and increasing environmental awareness in the region, make integrated surface - water /ground -water management essential. Management strategies may include aquifer storage and recovery (ASR) projects. ASR projects could be operated on a seasonal basis to capture surplus winter flows or on a multi-year climatic basis to store water for drought protection. To properly address these two questions requires a thorough reassessment of the geohydrology and geochemistry of the Santa Rosa Plain and development of a computer simulation model of the ground- water flow system. SCOPE This proposal describes a cooperative project that will study and report.on the geohydrology and ground -water management issues of the Santa Rosa Plain. This project will be the second phase of the county -wide work plan delineated in the USGS proposal for study of "Water Resources Availability and Management in Sonoma County, California." That proposal describes county-wide water management and the importance of the linkage between the Russian River basin - the main source of water supply —and the other basins that are dependent, in part, on Russian River water. This long term cooperative plan involves geohydrologicah assessment of each of the county's major ground -water basins, including the development of geographic - information systems .(GIS) and ground -water flow models. The ongoing first phase of the work in the original proposal focuses on the Sonoma Valley and Russian River system. Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study 13-2 OBJECTIVES The primary objectives of this second phase of the program are to 1) develop an updated assessment of the geohydrology and geochemistry of the Santa Rosa Plain; 2) develop a. multi - aquifer ground -. water flow model for Santa Rosa Plain; and 3) evaluate the hydrologic impacts of alternative ground- water management strategies for the basin. RELEVANCE AND BENEFITS As in the first phase of the USGS -SCWA cooperative studies of integrated multi-basin management of ground -water resources in Sonoma County, the proposed work in this phase will provide. much of the hydrologic information needed by SCWA, municipalities in the Santa Rosa Plain, and other management and regulatory agencies to better understand the potential impacts of increasing ground- water use on ground -water levels, stream discharge, stream - aquifer interaction, subsidence and water quality. The program also will provide the information and modeling tools needed by SCWA and others to efficiently utilize the County's surface- and ground -water resources. This project will consider several priority water- resource issues identified in the "Strategic Directions for the Water Resources Division, 1999-2008," including surface- and ground -water interactions, effects of urbanization on water resources, and hydrologic- system management. The long term plan for this cooperative. program, after completion of ground -water flow models of individual basins, is to develop a model that interrelates surface water, both local and imported, with the multiple ground -water basins for optimization of water resources utilization in Sonoma County. Such a model will-provide transferable tools for analyzing multi-basin water - management plans in other areas of the nation. STUDY AREA The Santa Rosa Plain is bounded to the southwest the Mendocino mountains and to the northeast by the Sonoma and Mayacama mountains (fig. 1)_ To the southeast is a structural rise separating the Santa Rosa Plain from the Petaluma Valley. The California Dept. of Water Resources (1982) suggests that the Adobe Creek Anticline may act as the barrier between the two basins. To the northwest, a series of hills separates the Santa Rosa Plain from middle part of Russian River system. The two. basins are linked by a gap in the hills southeast of Healdsburg (Caldwell, 1958). GEOLOGIC FRAMEWORK OF THE SANTA ROSA PLAIN Ongoing work by geologists at USGS indicates several geologic aspects of the Santa Rosa Plain that may have important implications for ground water (Robert McLaughlin, USGS, Menlo Park, written communication 2003)_ The Santa Rosa Plain is separable into two basins, the Cotati and Windsor basins, filled to 2.5 -3.0 km in depth with Miocene to Holocene sedimentary deposits and volcanic rocks. The Cotati basin is further subdivided into two sub - basins. These basins are floored with Mesozoic rocks of the Franciscan Complex, and could include serpentinite of the Coast Range ophiolite and strata of the Great Valley sequence. On the western side of the Santa Rosa Plain, the basement is overlain by Pliocene marine strata and nonmarine Pliocene- Pleistocene fluvial deposits. On the eastern side are Pliocene- Pleistocene fluvial deposits that may overlap the age of the marine strata to the west. Volcanic rocks of Pliocene to Miocene age underlie and are intercalated with parts of the marine and non - marine section. The age of the buried part of the basin section is largely unconstrained. Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study B-3 Along the western; margins of the Santa Rosa Plain are north- trending, down -to-the -east normal faults: of Pliocene and. younger age, exposed only in a few places. Along the northeastern margins are the active north - northwest trending Healdsburg and Rodgers Ck faults. The Windsor and Cotati basins are separated by a basement high associated with the west - northwest trending, northeast- dipping Trenton thrust. fault, which is exposed only locally. The Cotati basin is subdivided by a deeper basement ridge which is sub - parallel to the Trenton fault. The origin of this ridge is uncertain. GENERAL HYDROLOGIC DESCRIPTION OF SANTA ROSA PLAIN Water supply in the Santa Rosa Plain is met by combinations of surface -water delivery from the Russian River and ground water from local basins. Santa Rosa is the largest city in the county (136,000 people in 1998) and has had the most rapid growth. It utilizes primarily Russian River water, but maintains wells for emergency supply. Rohnert Park and Sebastopol currently use ground water for most of their supply. Windsor receives water from the aqueduct as well as its own wells located near the Russian. River. Windsor also. has wells within the Santa Rosa Plain for emergency supply. Cotati primarily uses aqueduct water, but maintains wells to provide backup supply and meet peak summer demands. SCWA operates three deep wells in the Santa. Rosa Plain that are tied into the aqueduct. In addition, there are numerous private wells in the Santa Rosa Plain that provide water for vineyards, cattle, and domestic. use. The USGS (Cardwell, 1958) and the California Department of Water Resources (1982) have completed studies of the Santa Rosa Plain. Caldwell identified the main water - bearing units to be the Pliocene Merced Formation, the Pliocene -to- Pleistocene Glen Ellen Formation, and the Pleistocene and Recent alluvium. The California Department of Water Resources (1982) stated that the two major water - producing zones in the Santa Rosa Plain are the Merced Formation and the alluvial fan deposits (Pleistocene to Holocene). Other potential water bearing units in the basin include the Pliocene Petaluma Formation and Sonoma Volcanics_ Santa Rosa Creek, Mark West Creek, and the Laguna de Santa Rosa (Laguna) provide the main surface drainage for the area. Santa Rosa and Mark West Creeks originate in the mountains to the east of the Plain. The Laguna runs along the western margin of the basin in the northern part of the Plain and is described. by Caldwell (1958) as "a swampy, intermittent drainage course" that "discharges to the Russian River through a narrow outlet." The USGS annual California water data summary states the following about the Laguna. "The Laguna is a natural water channel and overflow basin connecting the Santa Rosa Creek, Mark West Creek, and other smaller creeks with the Russian River. During floods, directions of flow may be either to or from the Russian River, and the Laguna acts as a natural regulator of floods on the lower Russian River." (Friebel and others, 2002) Caldwell (1958) noted that the streams in the Santa Rosa Plain were generally fed by discharge from ground water and that most ground -water recharge is from direct precipitation. As ground -water pumpage has increased, the stream- aquifer dynamics have likely changed. The general ground -water flow pattern is toward the center of the plain from the uplands to the east and west. Third Amended Cooperative Agreement to Provide Funding and Support information for Santa Rosa Plain Groundwater Study B-4 APPROACH The study has four principal tasks: (1) data compilation _ a GIS will be the primary means of organizing data for archiving; searching, interrelating, and displaying hydrologic and related information; (2) collection of new data, with a focus of water - quality sampling; (3) data interpretation and geohydrologic characterization - including refining hydrologic budgets, and updating conceptual models of the ground -water flow system based on the new data and the results of ongoing USGS. geologic studies in the basin; and (4) simulation of ground -water flow in Santa Rosa Plain. In this document, the basic required components of these four principle tasks are delineated. In addition, a set of potentially important additional data collection activities are presented. 1. Development of Geographic Information System (GIS) The USGS will work collaboratively with SCWA to develop a GIS of the Santa Rosa Plain. This work will build on the existing data bases that have been developed for the Sonoma Valley and Russian River areas by SCWA, the Sonoma Ecology Center, and the USGS. The GIS will form the basis for all later tasks, including determination of needs for new data collection. A partial list of data that would be included in the GIS is provided in table 1. 2. New Data Collection Water quality samples will be collected from selected wells, springs, and streams_ Initially, existing wells will be used and selected based on compiled data in the GIS and in consultation with County technical staff. As described in the section on "Possible additional data collection," there would be great value to drilling and installing multiple -well monitoring sites in the Santa Rosa Plain. Such monitoring sites would allow for discrete depth - dependent sampling/ measuring of water quality, water levels, and hydraulic. properties. Sampling will focus on delineating the source and age of ground water in the main water - bearing zones in the Santa Rosa Plain and characterizing the processes of (potential) water - quality degradation. The sampling will build on the recent water - quality data collected as part of the Groundwater Ambient Monitoring and Assessment (GAMA) .program. Water - quality analysis in this study will include basic inorganic constituents and nutrients. The stable isotopes of oxygen and hydrogen will be used to provide information on sources of recharge, and tritium/ helium will be used to provide information on ground -water age and travel time. Specific analyses of constituents of particular concern, such as arsenic, iron, and manganese, also will be conducted. Specifically, we propose to sample approximately 20 wells in each of the first two years of the project. All wells would be analyzed at the USGS Central Lab for major and minor ions; basic nutrients; trace metals; arsenic, iron, and chromium speciation; and stable isotopes of oxygen and hydrogen. Selected wells would be analyzed for tritium /helium dating and /or carbon -14 /Carbon 13/12 analyses_ Limited additional sampling would be conducted in year 3. Sampling locations and analytes would be chosen based on the results from the first two years of sampling. Other additional constituents that could be considered for sampling and analysis are listed in the section on "Possible additional data collection." Quality assurance plans will be developed. All new data collected in this study will be input into the project GIS. In addition all these data will be entered into the USGS national data bases (NWiS or GWSI). Supplemental Work for Year 2: Originally described under "Possible Additional Data Collection Activities" this supplemental work will include the collection of high- resolution seismic - reflection data in the Santa Rosa Plain. The data collected will be used to image basin structure and stratigraphy in critical areas as defined by current interpretation of borehole, geologic, and geophysical information_ In particular, the seismic - reflection Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study 13-55 data will constrain the geometry and depth extent of the. Trenton Ridge, a completely concealed basement high that may restrict groundwater flow within the Santa Rosa Plain. The seismic- reflection data will .(1) constrain how close to the ground surface this impermeable basement ridge extends, (2) evaluate whether the basement ridge folds or truncates sedimentary layers (aquifers) present above the ridge and in the adjacent basins, and (3) test whether the Trenton thrust fault extends east across the Plain, disrupting the sedimentary section. Project deliverables will include a data release, an interpretive report, and a presentation describing the results. 3. Data Interpretation and Geohydrologic Characterization The geohydrologic characterizations of the Santa Rosa Plain based on previous USGS and DWR studies will be updated using data collected for this program and the results of modeling: This will involve reassessing the hydrostratigraphy, quantifying the distribution and quantity of recharge and discharge (including pumpage), and evaluation of basin water quality. The main goals are to develop an updated representation of the hydrostratigraphy of the basin, obtain improved estimates.of the hydraulic properties of the water - bearing deposits, determine the sources and ages of ground water, characterize the general ground -water quality characteristics, quantify the three- dimensional basin ground -water budget, and evaluate the dynamics of surface- water /ground -water interaction. There will be particular focus collecting information on the changing dynamics stream aquifer interaction along Santa Rosa Creek, Mark West Creek, and the Laguna as ground -water pumpage increases. Note that there are currently eight active USGS gaging stations in the Santa Rosa Plain, but none of these stations have a long -term historical discharge record. The California Department of Water Resources (DWR) maintains a monitoring network of nearly 40 wells in the Santa Rosa Plain_ Water levels in these wells are measured semi - annually_ The network will be evaluated to determine if additional wells need to be added in order to provide adequate data for continuing hydrologic studies. Data from the networks will be analyzed to assess any long -term trends in ground -water levels and relations between precipitation and water levels. As part of this study, USGS researchers in Geologic Discipline in Menlo Park will develop a geologic framework model of the major water - bearing units in the Santa Rosa Plain. This framework model will provide the starting point for our reassessment of the geohydrology of the area and initial development of the ground -water simulation model This framework modeling will be conducted as part of a geologic/ geophysical project being coordinated by Robert McLaughlin. The overall goal of that project is to define the three - dimensional geology through areal geologic mapping, geophysical surveys, and various topical studies (including geochronology, sediment transport patterns, and fault histories). A particularly valuable benefit of the parallel geologic/ geophysical study in the Santa Rosa plain relates to the possible additional data collection activities described later. These activities could provide a wealth of new hydrologic and geologic information. The Menlo Park geologists and geophysicists, whose salaries are already covered, would be interested and available to analyze such new data if the costs of the field work and some student assistants were covered. We will coordinate with the USGS geologic/ geophysical study to compile the most recent geologic and soil mapping, geologic and geophysical well logs, and regional geophysical surveys. We will use these data along with newly collected geochemical data to reassess the hydrostratigraphy of the ground- water basins. GIS coverages of aquifer geometries will be created. As much as possible, pumpage data will be complied from the relevant entities. When that is not available, especially for historical periods, pumpage will. be derived from land -use and well- location data. Recharge areas will be identified using topography, geologic and soils maps, ground -water level records, and stable isotopes. Estimates of annual recharge will be made using data from precipitation stations, ground -water levels, water Third Amended Cooperative Agreement to Provide Funding and Support information for Santa Rosa Plain Groundwater Study B-6 chemistry, and environmental isotopes (tritium). Estimates of evapotranspiration along the creeks, particularly the Laguna, will be estimated based on hydraulics and vegetation types and densities. Chemical data from this study, combined with data from other sources, will be used to identify geographic areas and depth zones where poor quality water exists and diminishes the quantity of potable water available. Particular concerns with iron, manganese, and arsenic will be addressed. Sampling for volatile organics compounds (VOCs) is not included as part of the basic data collection for the study, but is listed as a possible additional task. If such sampling is undertaken, characterization of the presence of low -level VOCs is in the regional ground -water system would also be completed. Note that data on low -level VOCs for the Santa Rosa Plain has recently been collected as part of the GAMA study. 4. Simulation Model of the Santa Rosa Plain A ground -water simulation model using MODFLOW will be developed for the Santa Rosa Plain. The model serves first as an analytic tool for synthesizing all available geohydrologic information. The . completed model then can be used as a management tool to assess the hydrologic impacts of alternative water - management scenarios. As noted above, the initial determination of model layering will be based very closely on the three - dimensional geologic framework model to be developed by the USGS Geologic Discipline in Menlo Park. Based on the previous hydrologic investigations, the model will be designed to simulate conditions in the recent and older alluvium, the Glen Ellen Formation, the Merced Formation, and the Sonoma Volcanics. The model development will be based very closely on the new geologic framework work being conducted by the USGS Geologic Discipline. Data from the existing DWR water level monitoring network will be used for model calibration. Both steady state and transient simulations will be conducted_ In the current modeling of the Sonoma Valley, 1974 is being used for a steady state simulation. Because of the more extensive ground -water development in the Santa Rosa Plain, an earlier period may have to be used for steady -state simulation. The transient simulation would then extend from the steady state time period through to present conditions. it will be important that the model adequately represent the interaction between ground water and the major streams_ As noted earlier, the surface water regime is likely to change as a result of changes in ground -water conditions_ It also will be essential to accurately represent the hydraulic linkage between the Santa Rosa Plain and the adjacent basins - the middle Russian River system to the northwest, the Petaluma Valley to the south, and the Bennett, Rincon, and Kenwood Valleys to the east. The model will be a useful tool for testing the hydraulic impact of mapped faults in the basin using the Horizontal - Flow- Barrier package. Finally, the model will be formulated with the Inter -Bed Storage package, in order to have the capability of simulating subsidence. The model will be particularly valuable for simulating the likely long -term hydrologic consequences of alternative future scenarios. Scenarios would include a base case representing continued operation under current conditions. Other scenarios would likely consider shifts in pumping locations (both areally and vertically) and rates, ASR projects, and changes in delivery of Russian River. The model can also be used in a particle tracking mode. This enables detailed evaluation of the ground -water flow field and assessment of the potential advective transport of contaminants_ Third Amended Cooperative Agreement to Provide Funding. and Support Information for Santa Rosa Plain Groundwater Study B-7 POSSIBLE ADDITIONAL DATA COLLECTION ACTIVITIES In addition to the sampling and monitoring of existing wells and surface waters, there are additional data collection activities.that could provide invaluable geohydrologic data. Many of these activities would take advantage of the available expertise in the USGS Geologic Discipline. These data collection tasks are described briefly here.. A more detailed presentation of the specifics of the monitoring-well drilling and coring. is provided a separate document. Similarly detailed information, including costs, on the other possible additional data collection activities also can be provided. Drilling, coring, and logging deep (1200 -1500 ft.) drill holes and installation of multiple -well monitoring sites — This task is described in detail in a separate document.. In the course of evaluating existing well data - predominantly production wells with only driller's logs — as part of the current cooperative USGS -SCWA study, it has become clear that there is a crucial need for strategically located deep multiple -well monitoring sites. Without at least a few such monitoring sites, it is not possible the thoroughly characterize the three - dimensional ground -water flow system in the Santa Rosa Plain or in the other Sonoma County basins. During the drilling of such sites, there would be detailed logging by USGS.geologists providing accurate characterizations of lithology. At selected sites continuous coring would be conducted. The cores provide in situ sample of the materials and allow for direct assessment of Iithology, detailed stratigraphy, paleontology, tephra, paieomagnetic orientation, hydraulic.and thermal properties, and pore fluid chemistry. Once drilled, a broad suite of geophysical logs would be conducted in the borehole. Finally, four -to -six individual piezometers would be installed at different depths to allow for longterm monitoring of depth - dependent water.levels and water quality. Additional water - quality. sampling -- There is a broad range of additional water - quality sampling and analyses that could be conducted, including low -level VOCs; additional isotopes such as strontium, nitrogen, and boron_ More extensive carbon and tritium helium analyses could also be considered. Depth- dependent sampling - The USGS has specialized equipment for conducting depth dependent water - quality sampling within production wells. Combined with flow -meter logging, this procedure can quantify the different vertical chemical inputs that are contributing to the overall bulk water - quality of water pumped from a production well_ Areal Geologic Mapping -This would be used to focus and improve the 1.24,000 -scale geologic mapping around the Santa Rosa plain, to better carry surface stratigraphy into the third dimension, and to better define the distribution and recency of faults. Potential Field Geophysics - This would involve collection and interpretation of new detailed gravity data along with existing high - resolution aeromagnetic data. This work would be used to improve constraints on the shape of the basement (Franciscan) surface beneath the water bearing units, the .location, shape, and offset of faults within and bounding the Plain, and the distribution of mafic volcanics of the Sonoma Group. REPORTS As currently planned a summary USGS report (WRIR), a fact sheet, and several journal articles would be completed as part of this study. In addition to the formal reports, progress reports, frequent meetings, and a website will be utilized to facilitate communication and coordination with SCWA and other relevant stakeholders. Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study $ -8 PERSONNEL The project will require four senior hydrologists/ geographers (1/3 to 1/2 time per year) focusing on the geohydrology, geochemistry, simulation modeling, and GIS. In addition, there would be a 1/4- time field technician in years 1-4. At Ieast two researchers from the USGS Geologic Discipline will work 1/8 to 1/4 time in years 1 and 2. BUDGET COSTS: Federal fiscal Year 1- Year 2- Year 2- Year 3- Year 4- Year 5- year 2006 2007 2007 2008 2009 2010 (October 1- Supplemental September 30) Work Labor and travel $283,000 $401,000 $60,000 $400,000 $404,000 $296,000 Lab analysis, $115,000. $125,000 $60,000 TBD TBD TBD supplies, and $42,000 $57,000 $60,000 $81,000 $40,000 $44,000 contracts $200,000 $333,000 $60,000 $356,000 $319,000 $215,000 TOTAL $325,000 $458,000 $120,000 $481,000 $444,000 $340,000 FUNDS: Federal fiscal Year 1- Year 2- Year 2- Year 3- Year 4- Year 5- year . 2006 2007 2007 2008 2009 2010 (October 1 - Supplemental September 30) Work Requested federal funds $125,000 $125,000 $60,000 $125,000 $125,000 $125,000 Received federal $115,000. $125,000 $60,000 TBD TBD TBD funds Cooperative funds $200,000 $333,000 $60,000 $356,000 $319,000 $215,000 TOTAL $315,000 $458,000 $120,000 $481,000 $444,000 $340,000 As indicated above, a total of $125,000 in federal matching funds has been requested for all five years of the study. The exact amount of federal funding is subject to the availability of appropriations. Final determination of federal funding is expected by September of each year_ Additional costs would be incurred for any of the additional data collection activities. WORK PLAN The work plan assumes that the project will start in federal fiscal year 2006 (October 1, 2005 - September 30, 2006). It does not incorporate any of the additional data collection tasks. Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study I B-9 REFERENCES California Department of Water Resources, 1982, Bulletin 118 -4, Evaluation of ground . . water resources: Sonoma County, Volume 2: Santa Rosa Plain, 107 p. Cardwell, G.T., 1958, Geology and ground water in the Santa Rosa and Petaluma Valley areas Sonoma County: U.S. Geological Survey Water - Supply Paper 1427, 273 p. Friebel, M.F., Freeman, L.A., Smithson, J.R„ Webster, M.D., Anderson, S-W., and Pope, G.L_, 2002, Water Resources Data, California, Water Year 2001, Volume 2, Pacific slope basins from Arroyo Grande to Oregon State line except Central Valley, Water -Data Report CA -01 -02, 450 p. Third Amended Cooperative Agreement to Provide Funding and Support information for Santa Rosa Plain Groundwater Study B -10 2006 2007 2008 2009 2010 Geographic. information X X X X New Data Collection X X X Year 2- 2007 Supplemental (High-Resolution Seismic Reflection Profiling) X X Data interpretation and geohydrologic characterization (conducted collaboratively X X X X with ongoing eolo is stud Simulation model of Santa Rosa Plain X X X X Reports preparation and review X X X . REFERENCES California Department of Water Resources, 1982, Bulletin 118 -4, Evaluation of ground . . water resources: Sonoma County, Volume 2: Santa Rosa Plain, 107 p. Cardwell, G.T., 1958, Geology and ground water in the Santa Rosa and Petaluma Valley areas Sonoma County: U.S. Geological Survey Water - Supply Paper 1427, 273 p. Friebel, M.F., Freeman, L.A., Smithson, J.R„ Webster, M.D., Anderson, S-W., and Pope, G.L_, 2002, Water Resources Data, California, Water Year 2001, Volume 2, Pacific slope basins from Arroyo Grande to Oregon State line except Central Valley, Water -Data Report CA -01 -02, 450 p. Third Amended Cooperative Agreement to Provide Funding and Support information for Santa Rosa Plain Groundwater Study B -10 Aft 'i t'x`��s vac"' �r s .�'�rm. � �ri^-� �, s ' �v'� •� - ...... »..,� make HIV Figure t. Location of the Sang Eiosa Plain and key geographic feawres in Sonoma County, California. Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study B-11 � m.2 O m m _ E & t - w J O § < # 0 E 2 CD � 2 £ a k/\ CL CL m m a w cn 3� ? 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LL / m� 0 @ E q S G f 2 2w @ ©wok $ wamoe U) @ �� @ - elf » e 0 k � [ 2fk 0/ 2f w %_j o=o= k > � @ 2 ± K . . � . \a) E > 2 ) $ m m x -2:, E / U) @ �� @ w 7 ca o p m o» 0» 2 « = e r [ 2 0/ 2f f» %_j o=o= 2 ± K . . � . > 2 � E ¥ \ / 2 q o � / ® @ O � / 0 m 2 2 m a e> o ��uo $ g \=m - >1-2 ' -.a O G m/ m\- -s-- m m m -» E o 2 c E = o + p z< m o 0 0± 2/ K/ 0 a 7 2 / / 2 ± K ATTACHMENT C Draft Joint Funding Agreement with USGS Third Amended Cooperative Agreement to Provide Funding and Support Information forSanta Rosa Plain Groundwater Study C -1 ftgr, I oft Ms, Npeft, "tent of U,,*- wt-dor OW40ADWO FOR VNIATER f MEESCAMMS, ONSSMIGALTt"13 "MIS Aamvo—ruft vildiod tata -az dft I y,;d UUMD, SMAWS DEPARTMUM tr- 7146 TUSMOR, pat-{ of t!tr- f-r.1 poft amd twso"A& Wkff Y 1. To t *ttwk 4"- * 0#$4#144- *tOk*-. t,* 4 Awwup� ;x, Awopdwa% vista *MWOOM %M &W. t ob, Mac,41ws +eft " "14 Ma�f-w r a> to #i V" to W-4 VMAW10" or WO amummow ft".-mezvs d I* &I-ft Avz* P'41-, S1fmma Ovx4% cuff-0400. %*( Adslob—Ot"t I af4 MCA 43 (JX 94 4� 43 t= r: ,y t fAxang Zmaxoz thif lt lgbut W Foy ;mn U, 11c. -vw td 410 -W.VVftly fW,4 #*$ af-,444ml folo al I M tre tho OWIJ 41f 144 Ipwo" dwty! wa Wx,*� oy, 7W to USOIS WENG7 IS 1,7514WYM Mai to 6W-gcl velmtaa; An imb ct 04 pirc-at-On --loqf tso WM zx/ 441ftq- i" fpanfalof .41" 14 ho.,* it f-,,1,O-oWV0Y v---eioa #xwfi at 4, 71*, 604 Oftd wex*, stir` # illft4 in lli zr-x 'Am V,471 b,4 w4x, 144 dm 4n U4 «f v4,bW-t,, is l30mr-4, (40,W ty an 4ada�tT=t ruxa "en, at,.-D Y t, c razir%, Y--a i,Vpalt Adn'ta-A b,, trift vain- at Maftf pan % vauto t-,-- -tf:Vjrt< rab:o4ot. tz. tin be ir-lumt d fft PC-:>;r3-n, !A fell zrd rx,,oAubo to V4 prowam stctt bo tPerf'k- Lfte inzedrx W *,0 Ult1w 'xT, �dwj 4!f1% e.Virk :i ;; "-#A t,0414, Owledoo tq* MOU4,14• %df.,'VkK.VA't r,-%MV. 4tir"w" vmwty s r yt*,Oiflulfl lit, 4 -,,, -4 ct.xti; oi c,"Oys :Wl it� iuii tax ow T, 71°� 44 t4m UK;, flv<q-yav,ri .Nit U.a iff Ito &�Ucjr, W M4h at Ut's fward;- 4 1,V110,V Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study C-2 U,& tkcpsftft* Ott* JaW* OAi-MA, Twz U*m*6 =Arft- OF ratosma fto PMO rim 'WAK 4V404 t3 1-4 Ow"'. " W-014k. TP* mk;a, w-Wr4k 0(0004 OM#41*M t*-pW4h*d by th# 04t* WS, Dam AF A' *=4 rp-a"t W.OA,4 4% 04 PMW U, wat-, of v4 4400FRAI Af4 it ty cfln6 fitul par, ftf, -,JppA voqc", tm k4ftimed by tho pur�r ol ft gmt 4*4r 004fte. 1� ft m mism9c i r e tftu- %a tvt kx omt, " *-*W. cevy fft, or fegvft PaWad t'votormte Omr tcrta-k a t4�,.,crt of 16 WO W.MMKL Pw Mol. mr, R *A Ism bwapt raizsv D*gkr4%,-A* a 1pW ft paqagw-4 1r, coff4d b4pod duo dw Isi Mc 3717,010 WW F44 s4t= Aq-09 ZA 1Wf. 04. saoloateal swecy SOWMA COUNTY IVATUR AG(EUCY Depulacel of th a totalat -40WW MI of QM1443 SM-14 Rase CWOxMz iRt4ffs-solo Ct 10-tV-14--6 ftlax MIA Okla TAW T*R, IMPOY" P. t2JITIr -07 Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study C-3 ATTACHMENT D Planned Study Work. for Federal Fiscal Year 2008 (October 2007 - September 2008) as submitted by USGS Data Compilation USGS will continue to collect additional data from the stakeholders. USGS will complete processing of land use data and utilize it to estimate historic pumpage. USGS will complete input of well construction information_ USGS will complete compilation of existing DWR, DHS, USGS (including GAMA), and stakeholder water- chemistry data, and enter relevant data into the USGS national. database (NWIS). Finally, USGS will update watershed model inputs using more spatially detailed (higher resolution) SSURGO soils data and more detailed surface, geology. New Data Collection USGS plan targeted water- quality sampling to supplement the. existing chemistry data. In particular, USGS will conduct depth- dependent sampling of the SCWA Spring Lake well_ USGS will pursue additional depth- dependent sampling opportunities that may arise. USGS is conducting two sets of seismic reflection surveys to better characterize the role the Trenton Ridge_ These surveys will determine the depth of the Ridge, how far it extends across the Santa Rosa Plain, whether or not it truncates sedimentary Iayers (aquifers)_ (This seismic work was funded in the second amended agreement.) Data Interpretation and Geohydrologic Characterization USGS will complete its analyses of water -level contours and hydrographs. This will include identification of trends, determination of "steady state" conditions, and selection of wells to use for model calibration. USGS will complete the characterization of surface geology, stratigraphy, and lithology. USGS will analyze the specific- capacity data, in order to guide initial estimates of hydraulic conductivity for the ground -water model. USGS will analyze and identify water - chemistry trends and spatial patterns. Results from depth dependent -water quality analyses will assist in determining model layering. Groundwater flow modeling Groundwater modeling will be a major focus of work in 2008_ USGS will import the output from three - dimensional geologic and lithologic models into an initial MODFLOW ground -water model, and USGS will begin formulating the GSFLOW model. As described above, GSFLOW involves coupling MODFLOW with the Precipitation - Runoff Modeling System (PRMS)_ Specific modeling activities planned for 2008 include: • Using preliminary watershed model results to develop initial recharge boundary condition *Continue refining watershed model calibration using stream flow records ,,Import geologic /lithologic models into MODFLOW *Define initial parameter values Third Amended Cooperative Agreement to Provide Funding and Support Information for Santa Rosa Plain Groundwater Study D -1 *Develop pumping input data sets based on reported pumpage and estimates based on land use *Conduct initial MODFLOW calibration - - - 'Begin transition to GSFLOW, recalibrating the model to both streamflow and water -level data Budget for Fiscal year 2008 The USGS total budget for year 3 is $481,307. Of that amount, $125,000 will be provided by the USGS. The local cooperators will provide the remaining $356,307_ The primary staff from the USGS California Water Science Center (CAWSC) working on the project this year are Tracy Nishikawa (simulation modeling/ project chief), Joe Hevesi (PRMS modeling), Chris Farrar (geohydrology), Loren Metzger (geochemistry), and Andy Morita (GIS). Third Amended Cooperative Agreement to Provide Funding and Support information for Santa Rosa Plain Groundwater Study D -2