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HomeMy WebLinkAboutBC Water & Resource Cons - Correction, Technical Advisory Committee Meeting Agenda 1.17.19 Schuman, Amy From: Menchaca, Clarissa Sent: Monday, February 4, 2019 11:09 AM To: Schuman,Amy Subject: FW: [EXTERNAL] Correction: TAC Agenda Packet for January 17, 2019 meeting updated Correspondence. C , Associate Clerk of the Board IButteCount r. d miiniistratiron 5...County Center...Diriivc.,...Suite...200,._Oiroviilllle.r.0 9...596 5 T: 530.552.33081 F: 530.538.7120 II%mitt(TIF=acc,.bc>c>lk You II uuI[A Pliint(,.11-Est ............................................ ........................................................... ...................................................... ........................................................ From: Butte County Department of Water& Resource Conservation <bcwater@buttecounty.net> Sent: Friday,January 11, 2019 9:28 AM To: Menchaca, Clarissa <cmenchaca@buttecounty.net> Subject: [EXTERNAL] Correction:TAC Agenda Packet for January 17, 2019 meeting updated r. "u °"� �� :;,,,, Btte 1 1,4._ aunty WATER&RESOURCE CONSERVATION i 00001:2522„10010,I„ 1010,2-'2"1/1 11111„„„ „.0011/ 0101, 0,0,10„2/„„datttttttttt 10000' 01000, clrurl c„.7111 Advisory C;o rill tteit II 0 000000 0 001000 00 0000 001101h 00 0100 Butte County IDepertrnent of 1/Vater& Resource Conseryatiorl 41111,1 Butte County Department of Water & Resource Conservation 0 308 Nelson Avenue, OrovU|e, CA 95965 Unsubscribe .net Sent by bcwater©buttecolAnty.net 3 Water and Resource Conservation Paul Gosselin, Director ;//: ilial of 308 Nelson Avenue T: 530.538.4343 buttecounty.net/waterresourceconservati on "% bcwater@ buttecou nty.net ButteCountyOroville, California 95965 F: 530.538.3807 WATER&RESOURCE CONSERVATION BUTTE COUNTY TECHNICAL ADVISORY COMMITTEE MEETING DATE: Thursday, January 17, 2019 TIME: 1:00 p.m. —4:00 p.m. PLACE: Tahoe Room 202 Mira Loma Oroville, CA AGENDA ITEMS 1. Introductions and TAC Roll Call 2. * Approval of minutes for the May 3, 2018 meeting. (Chair Connell) 3. Election of Chair and Vice Chair for 2018 (Chair Connell) 4. * Sustainable Groundwater Management Act Updates (Staff, Water and Resource Conservation) 5. Project Updates (Christina Buck, Water and Resource Conservation) a. Groundwater Sustainability Plans- Basin Setting Project b. Airborne Electromagnetic Method(AEM) Survey 6. * Update on the Recommendations of the Water Commission Ad-hoc Subcommittee regarding the Basin Management Objective (BMO)Program (Kelly Peterson, Water and Resource Conservation) 7. * Review and comment on the Draft 2018 Annual Groundwater Status Report(Kelly Peterson, Water and Resource Conservation) a. * Summer and Fall 2018 Groundwater Level Measurements (see Appendices C & E for summary spreadsheets and Alert Stage Map) b. 2018 Water Quality Trend Monitoring (See Appendix D) c. Review Cover Report 8. Departmental Updates (Staff, Water and Resource Conservation) 9. Public Comment: Any person wanting to address the Technical Advisory Committee on any item NOT ON TODAY'S AGENDA may do so at this time. The Technical Advisory Committee will not be making decisions or determinations on items brought up during Public Comment. 10. Future Meeting date and location: May 2, 2019 at 2:00 PM at 202 Mira Loma Oroville, CA in the Tahoe Room * Indicates attached items TAC Agenda MINUTES OF THE Item #2 BUTTE COUNTY WATER COMMISSION TECHNICAL ADVISORY COMMITTEE May 3, 2018 Tahoe Room 202 Mira Loma Oroville, CA 95965 1. Introductions and Roll Call TAC members present: Chair Joe Connell, Todd Greene, Matt Meninga, Kyle Morgado, Richard Price and Debbie Spangler TAC members absent: Amanda Aguiar 2. Approval of minutes for the January 10, 2018 meeting Motion by Kyle Morgado, second by Richard Price to approve the minutes for January 10, 2018. Motion carried 6-0-0. 3. Review and comment on Spring 2018 groundwater level measurements and BMOs Information only, no action 4. Update on the Groundwater Sustainability Grant Information only, no action 5. Update on RFP for Basin Settings of Groundwater Sustainability Plan Information only, no action 6. Update on special projects a. Evaluation of Restoration and Recharge Potential within Groundwater Basins of Butte County Information only, no action b. Airborne Electromagnetic Method Information only, no action 7. Departmental Updates Information only, no action 8. Public Comment None 9. Future Meeting date and location: November 29, 2018 at 2:00 PM at 202 Mira Loma Oroville, CA Fall TAC meeting was cancelled due to the Camp Fire emergency. TAC Agenda \� rr�4 Proposed Butte County Subbasins ; Item #4 vin.,, 1 40 0,Fcv o& ii9 ...�.F i,, Vina Subbasin %U ♦♦♦♦, Butte Subbasin rr / ,.,„,t Wyandotte Creek Subbasin , r e 1` ltralgoie Wolin /, ,r rl0j /G( «Y.,h Gibpp 11 �. ,,. 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W � Ja an, METI, Esri>---® enStree Ma cont China (Hong King) Esri Korea, Esri(Thailand), NGCC, Mlles ,.e �U't":" t�„ar,,a y � p p . ° rs"'and flie"GIS User Community TAO Agenda #6 Water and Resource Conservation Paul Gosselin, Director Item a%// 308 Nelson Avenue T: 530.552.3595 buttecounty.net/waterresourceconservation Butte County ;; Oroville, California 95965 F: 530.538.3807 bcwater@buttecounty.net WATER&RESOURCE,CONSERVATION'''..... STAFF REPORT DATE: August 27, 2018 TO: Butte County Water Commission FROM: Kelly Peterson, Water Resources Scientist Department of Water and Resource Conservation RE: Recommendations of the Water Commission Ad-hoc Subcommittee regarding the Basin Management Objective (BMO) Program The Butte County BMO program has entered its fourteenth year. The BMO program has become an important cornerstone of our water resource management efforts to date. It was a required element of a Groundwater Management Strategy (AB3030 / SB1938) and integrated regional water management plans until recently with the passage of the Sustainable Groundwater Management Act (SGMA) of 2014 and the associated Groundwater Sustainability Plans (GSPs) which are now intended to fulfill those roles. In order to assure that the intent of the BMO program continues to be met in the interim while GSPs are being developed, without creating duplicative work now that the Department is implementing SGMA county-wide, a review of the program is necessary. On June 6, 2018, the Water Commission appointed Water Commissioners D.C. Jones, Tod Kimmelshue, David Skinner and Ernie Washington to an ad-hoc Subcommittee charged with reviewing and evaluating the BMO program. The Subcommittee has met twice since formation, once on June 29, 2018 and again on August 17, 2018. The review of the BMO program has identified many successes of the program over the years as well as areas that warrant improvement during this transition to sustainable groundwater management under SGMA. The establishment of BMO criteria and comprehensive monitoring and reporting, and outreach to stakeholders are among the strengths of the BMO program. However, the subcommittee felt that a clear need to transition this program into a more efficient, relevant and streamlined program while in place and to propose an expiration date of Jan. 30, 2022 for Chapter 33A in light of new SGMA requirements. On this date, the BMO program with the currently proposed revisions would expire and the fundamental components of the monitoring described in Chapter 33A would transition into a monitoring program more relevant to SGMA as described in the GSPs, required under SGMA for all subbasins in Butte County. Development of three GSPs relevant to the subbasin in Butte County are currently underway and have a deadline for submittal to DWR by Jan. 30, 2022. The revised BMO program will be used foundationally in the development of a new monitoring program more adept at meeting the legal requirements of SGMA and will phase out when the GSPs are submitted to the Department of Water Resources (DWR) by January 30, 2022. 1 As the BMO program moves forward temporarily before becoming enveloped into the new monitoring program as will be described in the GSPs, it should be based on what has worked so far -- scientifically credible BMOs, a strong monitoring program, clear reporting of data, sound evaluation of data and education and outreach to stakeholders. However, the subcommittee felt that the BMO program has been hampered by unrealistic expectations of stakeholder responsibilities and excessive irrelevant reporting requirements. To achieve these goals, a number of changes to the ordinance will be necessary as recommended by the committee. Addressing these recommendations will assure that the BMO program serves a strong relevant purpose while transitioning into the next phase of sustainable groundwater management within Butte County. The Oriciins of the BMO Prociram In January 2002, the Water Commission made a recommendation to the Board of Supervisors to investigate the concept of utilizing BMOs as a potential program for managing the groundwater basin. The BMO concept was based on a DWR, Northern District proposal and built from a similar program enacted in Glenn County. The Board accepted the recommendation and directed the Department to proceed with the development of BMOs for the basin area of the county. The Department drafted and publically circulated a draft ordinance for consideration by the stakeholders and eventually by the Board. After significant public comment and revisions, the Board approved the ordinance on February 10, 2004 and the BMO ordinance was codified as Chapter 33A of the Butte County Code. The BMO program became a component of the Butte County Groundwater Management Plan (2005). The original intent of BMOs was not to mitigate or provide third party impact protection as required through a Chapter 33 application. The ordinance included specific findings of the Board to articulate its intent: • Protection of the groundwater resource for beneficial use within the County is of major concern to the residents of the County for the protection of their health, welfare and safety. • The beneficial use and maintenance of groundwater and protection of recharge zones is of critical importance to the economy and environment of the County. • BMOs are intended to ensure the continued sustainability of groundwater quantity and quality within the County. • It intends to protect groundwater quality and prevent land subsidence. • It does not hereby intend to regulate, outside of Chapter 33, the use of groundwater; unless established BMOs are exceeded. • BMOs are essential for information gathering and management purposes that the County maintains a monitoring program addressing groundwater elevations, groundwater quality standards and subsidence criteria. • Through the enactment of BMOs, the County does not intend to limit other means of managing groundwater within the County as authorized elsewhere in statute or ordinance. • The County intends to work cooperatively with local entities and the general public to further develop and implement joint groundwater management plans. Upon enactment of the ordinance, the department began taking steps to implement the program such as producing guidelines for developing BMOs for each of the subinventory units (SIU). The SI Us are based on the Inventory and Subinventory units defined in the Butte County Water Resources Inventory and Analysis report (2005). The first BMOs were adopted in June of 2006. Since then, the Department in cooperation with the Water Advisory Committee, Technical Advisory Committee and stakeholders have collectively refined and modified some aspects of the BMO program. In 2008, the Department launched the BMO Information Center(BMOIC)which is a publically accessible database of key BMO wells and other data within the Counties of Butte, Colusa, Glenn and Tehama Counties. The BMOIC allows stakeholders to access groundwater data and prepare reports. In 2009, the TAC prepared a report and recommendations to streamline the BMO program. The TAC recommended updating and streamlining data collection, utilizing a standardized methodology for setting BMOs, improved communication between the WAC and the TAC and utilizing BMO data as part of the Drought Task Force evaluation. Limited resources from the County are available for managing the BMO program; therefore, program efficiency is essential. In 2011, the Water Commission made recommendations to the Board of Supervisors to further streamline and clarify roles within the BMO program by consolidating SIUs, removing formal approval of BMOs by the WAC, incorporating the BMO and Alert Stage criteria into the Ordinance, removing the WAC/stakeholders from overseeing the monitoring program, clarifying the non-voting roles of SIU representatives and that at-large WAC members, amending the frequency of WAC meetings and modifying the process to reflect that staff prepares the BMOs in consultation with the SIU representative as well as other items. A Review of the BMO Prociram Water Advisory Committee (WAC) and Public Participation - Public participation is at the heart of the BMO program and a source of its greatest strength and weakness. The goal of the Ordinance in regards to stakeholders, especially those appointed to the WAC, is for full public participation as a liaison with the Department and the respective stakeholders within their respective SIUs with minimal support from the department. This model for public participation can only function if public volunteers fully participate. However, the level of participation by stakeholders and the structure of the WAC have not met this goal. The WAC includes SIU representatives as well as representatives from watershed groups and other at-large members for a total of 28 representatives. The WAC was intended to be the primary public venue for BMO issues, however, the WAC has not adequately functioned as the outreach mechanism it was envisioned to be. Since 2006, most WAC meetings failed to have a quorum. And those that did, had a quorum by the slimmest of margins. Finding candidates to fill WAC positions has been difficult or impossible and some positions have been vacant for close to two years. A majority of the members typically miss most meetings. In fairness, there are a small number of WAC members that have consistently participated in the creation of BMOs, outreach to stakeholders and have attended most WAC meetings. The WAC has played an important role as a forum for stakeholders to receive data and share anecdotal information however the information is not reported regularly and can at times be non- relevant to the evaluation of monitoring results. A significant amount of resources and effort have taken place to make the ordinance function as intended. However, the program has reverted to a more traditional structure of having the staff administer the program with minimal input from stakeholders. The repeated attempts to make this process function have been unproductive for both the Department and stakeholders. The envisioned new role of the WAC/SIU representatives includes their transition into one of the Stakeholder Advisory Committees or Technical Working Groups that are being developed as part of the governance structures in the subbasins in which they reside. These committees / groups will function to develop the monitoring components as described in the GSP which will be aimed at establishing the monitoring objectives, sustainable criteria, thresholds and project and actions which will provide the tools to sustainably manage groundwater throughout the subbasin in Butte County. Sub-inventory Units - The BMO program established Inventory and Sub-inventory units based on the units defined in the Water Inventory and Analysis report (2005). The SIUs would no longer be valid structures given the dissolution of the WAC and also in light of the new structures provided for under SGMA regarding subbasins and Management Areas. For example, GSPs are now required for each subbasin under SGMA by January 30, 2022. Management Areas are planning areas within subbasins that have common land use practices for which a GSP may identify different minimum thresholds, measurable objectives, monitoring, and projects and actions based on unique local conditions or other circumstances. GSPs may be organized such that each Management Area functions as a chapter of the GSP. Removal of terminology regarding SIU's throughout the ordinance will not only reduce the reporting requirements for each SIU while this Ordinance is in place, but it will also strengthen the program to support ongoing efforts to meet the legal requirements of SGMA. BMOs — BMOs are intended to reflect measurements that demonstrate acceptable local groundwater conditions. When measured groundwater conditions do not meet established BMOs, the program adopted a set of BMO Alert Stages that reflect unacceptable groundwater conditions. The adoption of the standardization methodology by Butte County has resulted in two acceptable methods. The concept of setting BMOs and Alert Stages has proven to be a valuable construct. For clarity and transparency, the BMO criteria should be part of the ordinance while it is in place during transition to more robust and SGMA-relevant sustainable criteria which will be described in the GSPs currently being developed. GSPs will include components describing measurable objectives, sustainable criteria, minimum thresholds, monitoring and projects and actions for each of the undesirable results identified in SGMA. Once GSPs are implemented they will describe criteria similar to BMOs and Alert Stages, however they will be more robust, comprehensive and enforceable. Monitoring - The BMO program utilizes a comprehensive monitoring network that includes domestic, irrigation and municipal supply wells that began under Chapter 33. The network also includes dedicated monitoring wells, of which many have continuous recorders. The department, in consultation with the TAC and stakeholders have continued to evaluate the existing BMO monitoring network to consider adding new wells as resources allow. Under these recommendations, the monitoring of groundwater conditions will continue status quo until the ordinance expires at which point monitoring will continue under the provisions of Chapter 33 and through applicable GSPs. BMO Report - The BMO annual report has increased in volume and complexity while becoming less useful to stakeholders over the years. Typically the development of the Annual Groundwater Status Report which includes 16 individual BMO reports ranging from two to 23 pages in length, is completed by the Department with input from some SIU representatives, if available. This report is presented to the Board each February pursuant to Chapter 33. Unfortunately, a considerable amount of time and effort is expended by staff to develop this report including the individual SIU reports. This document can be streamlined while the Ordinance is in place by focusing on the specific BMOs and BMO monitoring data per subbasin as related to DWR's Bulletin 118 and SGMA instead of the individual SIUs. After the expiration of the ordinance, the GSP will fulfill the goals and objectives of an annual report on groundwater conditions as required by Chapter 33. Such an approach will allow for a more efficient and relevant display of data. Technical Advisory Committee (TAC) - The TAC, established by Chapter 33, plays an important role in the BMO program. The role of the TAC should be to evaluate BMO monitoring data and information provided by the Department and provide recommendations to the Department and Water Commission as appropriate. Outreach - One of more important successes of the BMO program is the factual, scientific information provided to stakeholders. The BMO program established a foundation for dialogue between the Department, SIU representatives and stakeholders. A number of SIU representatives have not actively participated in the BMO program. This includes not providing feedback to the Department on the preparation of their BMO, not conducting any outreach to local stakeholders or providing input to the Department regarding the groundwater conditions in their respective SIUs. Beginning in 2009, the TAC has requested a single page survey to be completed bi- annually by SIU representatives on conditions in their SIUs. This reporting mechanism has been underutilized in most years since 2009 (i.e. 1 of 23 returned in 2018)which means that the TAC does not receive a comprehensive picture on conditions that they would desire to evaluate BMO data. Outreach will continue to be provided while the Ordinance is effective through a variety of methods already occurring including numerous public meetings where data is presented and discussed. These venues include but are not limited to TAC meetings, Water Commission meetings and Board of Supervisors meetings. Monitoring data, associated evaluations and reports are also provided on the Department's website and addressed in monthly newsletter articles when available. Once the governance structures are in place for the subbasins within Butte County, many other opportunities for public participation, outreach and input as required by SGMA will also be available at venues including but not limited to GSA Board meetings, Stakeholder Advisory Committee Meetings, and Technical Working Group Meetings. Response to BMOs - The response to BMO noncompliance currently includes increased outreach to stakeholders and potential investigations that could include additional data collection and monitoring. As was learned during the drought, providing stakeholders with factual information and analysis on groundwater conditions is a powerful tool in groundwater management. Summary of Recommendations from the Subcommittee: • Incorporate an expiration date for the ordinance of January 30, 2022 to align with the final deadline for submittal of GSPs to DWR under SGMA for subbasins in Butte County. • Continue monitoring status quo until expiration of the Ordinance (Chapter 33-A) on January 30, 2022. • Clarify the definition of"Aquifer" • Clarify the definition of"Commission" • Dissolve the WAC by removal of references to it's structure, membership, operations, internal roles, and external interactions with TAC and the Department and rescinds WAC bylaws. • Clarify that the TAC no longer consults with the WAC on local conditions affecting monitoring results • Removes references to WAC members serving as subinventory unit representatives as the structure for public participation in the program • Removes references to subinventory units as land under which monitoring results are grouped for reporting purposes and which serve as a method to determine WAC membership • Clarifies units for water quality measurements Summary The BMO program has been a critical component of the County's water management effort. Over the past fourteen years the BMO program has made enormous progress in developing, analyzing, and disseminating factual information on local groundwater conditions. These actions have been essential to making sound, informed, and locally driven water resource management decisions. Without such data, analysis and outreach and water management decisions would not have contributed to the current level of understanding of groundwater conditions that we currently have which has provided for a mostly-seamless transition to the next phase of sustainable groundwater management under SGMA. The future success of the BMO program can be enhanced through the above recommendations that will help to improve public participation, program clarity, and efficiency until the ordinance expires and transitions into the foundation for the next phase of sustainable groundwater management under SGMA. Recommendation The Water Commission Subcommittee recommends that the Water Commission: 1. Support the recommendations of the Subcommittee. 2. Recommend to the Board of Supervisors that they adopt amendments to Chapter 33A and Water Advisory Committee By-laws consistent with the recommendations and upon completion and consideration of a 30 day public comment period on the draft amendments. TAC Agenda Item #7 Butte County Department of Water and Resource Conservation Groundwater Status Report 2018 Water Year Submitted to TAC January 2019 Executive Summary - 2018 WY The 2018 water year (WY) started out with a wet November, but dry conditions returned continued through the rest of the winter months. Spring rains in March and April made a marked improvement to the water year overall which ended with statewide precipitation amounts of about 75% of average. The state's water supply conditions continued to benefit from the abundant runoff of the previous wet 2017 WY which propped up reservoir storage throughout 2018 even with below average rainfall, snow pack and runoff conditions. Surface water supplies from 2017 helped buffer the impacts of the warm and dry 2018 WY. The 2018 WY began October 1, 2017 and was classified as a below normal water year type for the Sacramento Valley. It followed a wet year, below normal year, two critical years, and a dry year. According to the Northern Sierra Precipitation 8 Station Index, the 2018 WY ended on September 30, 2018 with 41.0 cumulative inches of precipitation, 79%of the long-term average. Another measure of hydrologic conditions is the amount of runoff to streams and rivers. The Sacramento River Region unimpaired runoff during the 2018 WY was 12.7 million acre-feet (MAF), which is about 71%of average and only about one third of the runoff that occurred in the historically wet 2017 WY. April 1 snowpack statewide was 58%of the April 1 average. Although there was below average rainfall and runoff, carryover storage in the reservoirs from 2017 resulted in statewide reservoir storage of 105% of the April 1 average. A return of drier conditions in 2018 from the record wet year of 2017 once again brought modest declines to groundwater levels, specifically in groundwater dependent areas of the county. The Department, in cooperation with the Department of Water Resources Northern Region Office, conducts four (spring, July, August, fall) groundwater level measurements annually. Spring groundwater levels in 2018 were about 3 feet lower on average compared to the spring of 2017 (see Table ). Fall groundwater levels in October 2018 were about 1.3 feet lower on average compared to October 2017. Almost half of the monitored wells with assigned alert stages remain at a spring and/or fall alert stage 1 or 2 indicating levels remain near historical lows (Table 4 and Table 5). The Department conducted its seventeenth year of groundwater quality trend monitoring for evidence of saline intrusion during July 23 through July 26, 2018. All samples were within the acceptable range for electrical conductivity and pH, and temperatures remained relatively consistent. The 2018 Water Quality Trend Monitoring Report can be found in Appendix D and highlights are included later in this report. Subsidence is monitored by periodic land surveys and by use of extensometers. No inelastic land subsidence was detected in Butte County from an evaluation of the extensometer records in the proposed Butte subbasin. A Sacramento Valley-wide GPS survey was conducted during 2017. Results of the survey will be available in 2018 and will provide additional land subsidence data to better measure and detect possible subsidence throughout the county. i I lP E Table of Contents Executive Summary- 2017 Water Year Foreword 1 Hydrologic Conditions 4 Precipitation 7 Feather River Surface Water Diversions 8 Groundwater Conditions 9 Monitoring Frequency 9 Groundwater Quality Trend Monitoring 9 Land Subsidence 11 Well Permits 13 Groundwater Level Monitoring 14 Change in Groundwater Levels: 2016 to 2017 16 Seasonal Groundwater Level Change 18 Basin Management Objectives (BMOs) 18 Well Numbering System Appendix A Butte County Monitoring and CASGEM Network Maps Appendix B Groundwater Level Alert Stage Maps Appendix C 2018 Water Quality Trend Monitoring Report Appendix D Spring, Summer, &Fall BMO Summary Tables Appendix E DWR Groundwater Level Contour&Change Maps Appendix F ii I IPS Foreword This report presents the status of groundwater conditions and ground surface elevation monitoring based on data collected by Butte County and the California Department of Water Resources (DWR) during the 2018 Water Year (WY), October 1, 2017 - September 30, 2018. The fall measurements taken in mid-October 2018 are also included since they reflect conditions and activities of the 2018 WY. The report gives general information regarding locations of wells and extensometers, statistics related to groundwater level trends and historical precipitation information. This report was prepared by the Butte County Department of Water and Resource Conservation (Department) with assistance from DWR, Northern Region and the Technical Advisory Committee. This report complies with reporting requirements established in Chapter 33, Chapter 33A of the Butte County Code, and the California Statewide Groundwater Elevation Monitoring program (CASGEM). In November 1996, the voters in Butte County approved "AN ORDINANCE TO PROTECT THE GROUNDWATER RESOURCES IN BUTTE COUNTY." One of the stated purposes of the ordinance was that "the groundwater underlying Butte County is a significant water resource which must be reasonably and beneficially used and conserved for the benefit of the overlying land by avoiding extractions which harm the Butte Basin aquifer, causing exceedance of the safe yield or a condition of overdraft."The ordinance is now codified as Chapter 33 of the Butte County Code relating to groundwater conservation. Section 3.01 — "Groundwater Planning Process" requires the preparation of a groundwater status report based upon the data gathered and analyzed pursuant to Section 3.02—"Groundwater Monitoring". Until 2010, this reporting was completed by the Butte Basin Water Users Association (BBWUA). In 2000, the Butte County Board of Supervisors amended Chapter 33, the Groundwater Conservation Ordinance, to require the Groundwater Status Report be delivered by February 21st of each year. In 2010, the Water Commission designated the Department of Water and Resource Conservation as the entity responsible for creating and submitting the annual report. Over the years, as responsibilities and water resource programs including advisory committees have shifted more and more to the County,the Butte Basin Water Users Association participation has declined. In 2012, its members voted to dissolve the organization, after twenty years of serving the region. In February 2004,the Butte County Board of Supervisors adopted the Groundwater Management Ordinance which was codified as Chapter 33A of the Butte County Code. Chapter 33A calls for the establishment of a monitoring network and Basin Management Objectives (BMOs) for groundwater elevation, groundwater quality related to saline intrusion, and land subsidence. The BMO concept was incorporated into California Water Code §10750 et. seq., as a component of AB 3030 Groundwater Management Plans (GMPs). On September 28, 2004, the Butte County Board of Supervisors formally approved Resolution 04-181 adopting the countywide AB 3030 GMP that includes the components of the BMO program. In 2011, Chapter 33A was amended and retitled to "Basin Management Objectives (BMO)" and now requires the BMO report be submitted in February of each year. The foregoing actions by the Board allow the reporting of 1I1PE groundwater conditions from Chapter 33 and 33A to be consolidated into a single report to be submitted by the Department on an annual basis in February. The Groundwater Status Report is in the process of undergoing revisions over the next few years in order to meet requirements of the Sustainable Groundwater Management Act (SGMA). On September 16, 2014, Governor Brown signed into law a package of bills collectively called SGMA. The Sustainable Groundwater Management Act requires local management of groundwater basins, and provides the state with broad oversight authority and the ability to intervene. Local management of basins is the responsibility of a local public agency or combination of local agencies that designate themselves as the "Groundwater Sustainability Agency" for all or a portion of their basin or subbasin. Local public agencies eligible to be a Groundwater Sustainability Agency (GSA) must have water supply, water management or land use responsibilities. GSA formation was required byJune 30, 2017,with the consequence of the State Water Board assuming management of any basins unable to meet these requirements. All four of the original groundwater subbasins within Butte County have established GSAs covering the entirety of the subbasins. Discussions among GSAs to establish governance structures for how groundwater will be managed and Plans developed in these subbasins began in earnest in 2018 and will continue in 2019. Proposed basin boundary modifications are currently pending approval by DWR and will reduce the number of subbasins from four to three: Vina, Butte, and Wyandotte Creek subbasins. Groundwater Sustainability Agencies must prepare and implement Groundwater Sustainability Plans ("Plan") for their basin/subbasin or their portion of their basin or face the prospect of state intervention. Plans must be adopted by January 31, 2020 for basins that are in critical overdraft condition or by January 31, 2022, for all other basins. Since the subbasins in Butte County are not in critical overdraft, Plans will have to be submitted by January 31, 2022. Plans must contain the same elements as those in Groundwater Management Plans. Additionally, Plans must include a water budget covering a 50 year planning horizon, measurable objectives and interim milestones (every five years) that will lead to sustainability in 20 years. Plans must address"undesirable results"that include chronic lowering of groundwater levels and significant and unreasonable reduction in groundwater storage, degradation of water quality, land subsidence and surface water depletions. Plans are exempt from the California Environmental Quality Act but projects or actions to implement the plan are not exempt. Groundwater Sustainability Agencies must submit an annual report to DWR by April 1st. The report must include the following information: • Groundwater elevation data • Annual aggregated data identifying groundwater extraction for the preceding WY • Surface water supply used for, or available for use for groundwater recharge or in-lieu use • Total water use • Change in groundwater storage. The first annual report will not be required until 2023. The approach will be to modify this County annual Groundwater Status Report to meet the requirements of the report that must be submitted by GSAs for each subbasin. 2IPdge In addition, in light of new requirements of SGMA, revisions to Chapter 33A are underway to continue the transition from the BMO program to implementation of SGMA in each of the subbasins in Butte County. The BMO program has been a critical component of the County's water management effort. Over the past fourteen years the BMO program has made enormous progress in developing, analyzing, and disseminating factual information on local groundwater conditions. The strengths and benefits of the BMO program will be incorporated into the governance, Plans, and outreach established under SGMA. As a result, revisions to Chapter 33A will incorporate an expiration date for the ordinance of January 30, 2022 to align with the final deadline for submittal of Plans to DWR under SGMA for subbasins in Butte County. In the meantime, monitoring and reporting of groundwater conditions (levels, water quality, and land subsidence) will continue, but will become consistent with the extents of the three subbasins managed under SGMA and defined management areas will replace sub-inventory units for reporting purposes. This annual report begins to make this transition in the tables and maps included in the appendices. The CASGEM program was amended to the Water Code in 2009 through the enactment of SBx7- 6, Groundwater Monitoring, as part of the Comprehensive Water Package. CASGEM mandates statewide groundwater elevation monitoring to track seasonal and long-term trends in basins throughout the state. The legislation created a statewide program to collect groundwater elevation data, facilitate collaboration among monitoring entities, and develop a means of reporting groundwater data to the public. The Department has this responsibility as the monitoring and reporting entity for Butte County. As described in the Butte County CASGEM Monitoring Plan, the Butte County CASGEM program will utilize approximately 72 wells from the network for the CASGEM program. A map of these locations can be located in Appendix B. The 72 wells comprise primarily dedicated monitoring wells and some key wells identified in the Annual Groundwater Status Report. Data from published reports prepared for the Butte County Department of Water and Resource Conservation are included throughout this document where relevant, and the referenced documents are listed in Appendices or as references, as well as being available on the Department's website at www.buttecounty.net/waterresourceconservation. All past years' Groundwater Status Reports and BMO documents are also available on the Butte County Department of Water and Resource Conservation website. 3IPdge Hydrologic Conditions There are a number of data sources and indices available to characterize hydrologic conditions. The data sources typically report hydrologic data on a Water Year (WY) basis, or the 12-month period from October through September.The 2018 WY began on October 1, 2017 and ended on September 30, 2018. The 2018 WY was classified as below normal for the Sacramento Valley. At the end of the 2018 WY on September 30, 2018,statewide hydrologic conditions were as follows: precipitation was 75% of average; runoff was 70% of average; and reservoir storage, 100% of average. Sacramento River Region unimpaired runoff observed through September 30, 2018 was about 12.7 MAF, which is about 71%of average. For comparison,Table 1 shows the volume and percent of average runoff for the previous WYs since the wet year in 2011. Table 1. Sacramento River Region Unimpaired Runoff(Million Acre Feet) WATER YEAR 2018 2017 2016 2015 2014 2013 2012 2011 UNIMPAIRED RUNOFF (MAF) 12.7 37.9 17.4 9.2 7.5 11.9 11.8 25.2 OF AVERAGE 71% 212% 98% 51% 41% 65% 65% 138% The Northern Sierra 8-Station Precipitation Index(Figure 1) serves as a precipitation index for the Sacramento River hydrologic region by averaging measurements taken at the following precipitation stations: Blue Canyon, Brush Creek Ranger Station, Mineral, Mount Shasta City, Pacific House, Quincy Ranger Station, Shasta Dam, and Sierraville Ranger Station.' This index provides a representative sample of the region's major watersheds: the upper Sacramento, Feather, Yuba, and American Rivers, which produce inflow to some of California's largest reservoirs - the source of much of the state's water supply. The 2018 WY ended with 41.0 cumulative inches of precipitation which is 79% of the long term average. The 2018 WY curve is labeled "2017-2018 (current)" on Figure 1. ' http://cdec.water.ca.gov/cgi-progs/products/PLOT_ESI.pdf Wage Northern Sierra Precipitation: 8-Station Index 100.............................. ................ ................. ...................................................................................... ................................................................................. 95 (201 6 211 wettest) 90 85. 80 75 70 6 .770 -+ 60. a+ �� (2015-2016) a 50.. ....k V ttir� ff"6t)4u �fli¶ rr - 0- 1- M - mM 45 �• m 7:1 40x i 35. E 3� f'If.f H (2013-2014 drought) 25 ) 20 19 0 1923-1924 (driest) ra" • 17. 15 10 1976-1977 1977 5 (second driest) Oct 1 Nov 1 Dec 1 Jan 1 Feb 1 Mar 1 Api 1 May 1 Jun 1 Jul 1 Aug 1 Sep 1 Oct 1 Water Year(October 1 - September 30) Average a966-2015) —1923-1924(driest) —1976-1977(2nd Driest' 2013-2014 2015-2016 2016-2017(Wettest) ----2017-2018 Figure 1. Northern Sierra Precipitation: 8 Station Index Figure 2 shows the WY type classifications based on the Sacramento Valley 40-30-30 Index going back to 1960. The Sacramento Valley was classified as below normal for the 2018 WY with an index value of 7.2 (Figure 2). WY classification systems provide a means to assess the amount of water originating in a basin. WY classification systems are useful in water planning and management and have been developed for several hydrologic basins in California. The Sacramento Valley 40-30-30 Index was developed by the State Water Resources Control Board (SWRCB) for the Sacramento hydrologic basins based on Sacramento River runoff. This system defines one "wet" classification, two "normal"classifications(above and below normal), and two "dry"classifications(dry and critical), for a total of five WY types. 51Pdgo The Sacramento Valley 40-30-30 Index is computed as a weighted average of the current WY's April-July runoff forecast (40 percent), the current WY's October-March runoff(30 percent), and the previous WY's index (30 percent). A cap of ten MAF is put on the previous year's index to account for required flood control reservoir releases during wet years. Sacramento River runoff is the sum of the Sacramento River flow at Bend Bridge, Feather River inflow to Lake Oroville, Yuba River at Smartville, and American River inflow to Folsom Lake'. Sacramento Valley WY Hydrologic Classification is: Year Type WY Index Wet Equal to or greater than 9.2 Above Normal Greater than 7.8, and less than 9.2 Below Normal Greater than 6.5 and equal to or less than 7.8 Dry Greater than 5.4, and equal to or less than 6.5 Critical Equal to or less than 5.4 20 • Wet Above Normal Below Normal - Dry 15 – _ • Critical —Average 1960-2018 III I I 0' _s N N N N N N N N N N CSDCC) (C) CC) COCC) COCOCI) CgCO (1) CC) (ID CO (.C) CC) COCC) CC) C) OC7C) C C? pC7C C7 C5) 0) C5) (3) C5) v C3OCOCCmGO (.C) COCOCC) COC OdC) C N C3) 00 C N 0) CO C N C5) CO d N o) co ca N U7 co Q N (5) CX5 Figure 2. Sacramento Valley WY Type Index 40-30-30 2 http://cdec.water.ca.gov/cgi-progs/iodir/WSIH 1ST 6IPdge Precipitation Figure 3 shows the total annual precipitation at the Western Canal Station for the 58-year period, WYs 1960 through 2018. Precipitation for the 2018 WY measured at Western Canal Water District's Climatological Observation Station totaled 13.29 inches (63% of average). This is 7.86 inches below the 50-year(1960-2010) average of 21.15 inches. 45 – Annual Precipitation 40 —1960-2010 Average 35 (21.15 in.) U) .c 30 25 , , o , q Y 20 15 I -- m 10 – 5 No Data 0 IIIIIIIIlIkIIIIIIIIIIIIIIIII11111111111 IIIIIIII1111114-- 8 (-0` 1 S > . N N Ni N R CS) CL7 CO 0) CO CO CJ C0 O O O U1 Q CFU O 01 0 CJt O C.n O CJi Water Year Figure 3. Annual Precipitation 1960-2018 WYs -Western Canal Climate Station The timing of rainfall in the valley influences irrigation water use. The daily precipitation in the 2018 WY reported from the California Irrigation Management Information System (CIMIS)station in Durham provides an indication of when and how much rainfall occurred and how that may affect the irrigation season (Error! Reference source not found.). 2.5 In t• 2 '.. C .5 C • .A. ........ 0.5 I III II I a �f)' �`. U�` yb y4r yb b b yb yb yb ➢> c;\,� ��� � y\� A`� �`�� \1 �v ��� \ \� \ �A 2 of 4 co\ \ \ Figure 4. Daily Precipitation (inches) - Durham CIMIS station 7IPdge The graph of daily precipitation shows storm activity throughout the fall, winter, and spring with only two separate storm events measuring over one inch of precipitation in a single day. During the wet spring from April rains, the irrigation season began later than usual, likely near the beginning of May. According to discussions with growers in the Durham / Chico area a significantly increased amount of water use was required for frost protection this WY than in years past. While the requirements varied by specific site, approximately 10-14 nights were irrigated for frost protection throughout the spring from mid- to late-February, a few days throughout March and into late-April. Feather River Surface Water Diversions Surface water is an important component of the water supply and has benefits to aquifer recharge in the Butte Basin. During the 2018 WY, 937,004 acre-feet (AF) of surface water was diverted by Western Canal Water District (WCWD) and the Joint Water Districts Board. The 2018 WY diversions increased by 56,371 AF from the 2017 WY amount and by approximately 295,000 AF more than in 2015. Rice growers participated in fallowing water transfers in 2018 and late spring rains led to lower April water deliveries than in years with dry springs. In the 2015 WY, WCWD and the Joint Water Districts Board had a 50% curtailment of their surface water deliveries due to the drought. It was the first curtailment in 23 years. Reliable surface water supplies reduce or eliminate the need for groundwater pumping, except when curtailments occur, and provide some recharge to the basin. This results in generally shallow and stable groundwater conditions in these district areas. Error! Reference source not found. summarizes diversions in acre-feet to Western Canal Water District and the Joint Water Districts Board for WYs 2000 to 2018. Table 2. Surface Water Diversions (acre-feet) Water Western Canal Joint Water Year Water District Districts TOTAL Board* 2000 314,737 707,018 1,032,392 2001 302,784 718,489 1,021,562 2002 305,460 597,529 902,989 2003 271,867 682,403 954,270 2004 329,700 790,663 1,120,363 2005 284,188 750,128 1,034,316 2006 294,898 743,345 1,038,243 2007 318,159 824,286 1,142,445 2008 332,500 740,748 1,073,248 2009 327,184 711,693 1,038,877 2010 313,196 689,518 1,002,714 2011 288,912 718,771 1,007,683 2012 309,213 706,671 1,015,884 8IPdge 2013 324,128 731,560 1,055,688 2014 319,073 654,696 973,769 2015** 249,965 392,091 642,056 2016 283,071 546,999 830,070 2017 263,179 617,454 880,633 2018 284,192 652,812 937,004 * Joint Water Districts Board includes Biggs-West Gridley Water District, Butte Water District, Richvale Irrigation District, and Sutter Extension Water District. ** 50% Curtailment of surface water deliveries occurred this year due to drought Groundwater Conditions Monitoring Frequency Butte County Code, Chapter 33 and 33A, calls for the establishment of a monitoring network for groundwater quality related to saline intrusion, land subsidence, and groundwater levels. The Groundwater Quality Trend Monitoring Program is designed to track single monitoring events throughout the county during the peak irrigation season on an annual basis. The data is collected each July or August at the peak of irrigation season to establish baseline levels across the county to detect changes, which may require further investigation. Monitoring frequency for land subsidence is conducted on a continuous basis by extensometers. Groundwater level monitoring occurs four times per year. Sections 33-4 of the Butte County Code enacted in 1996 and 33A-8 of the Butte County Code enacted in 2004 state that groundwater level measurements shall be taken from all designated monitoring wells at least four (4) times per year, during the months of March, July, August, and October. The California Department of Water Resources(DWR)and the Butte County Department of Water and Resource Conservation (Department) share the monitoring duties. DWR conducts the majority of the spring, summer and fall measurements while the Department collects the July measurements. Groundwater Quality Trend Monitoring Temperature, pH, and electrical conductivity(EC) are recorded for water samples from a network of thirteen wells throughout the county. These parameters provide the basis to evaluate for evidence of saline intrusion. 9IPdge Summary Highlights from 2018 • 12 of the 13 wells were sampled July 23, 2018 through July 26, 2018 • 1 well was temporarily inaccessible • Temperatures remained relatively consistent in all water samples • All measurements were within the acceptable range for pH • All samples were within the acceptable range for electrical conductivity • No evidence of saline intrusion was detected Water quality parameters have naturally occurring variability, so year-to-year changes are expected and nothing in this year's measurements give cause for further investigation or analysis. Further investigation would be advisable if values were to fall outside of the acceptable range. The 2018 Water Quality Trend Monitoring Report (Interdepartmental Memorandum) can be found in Appendix D. Program Background The Butte County Groundwater Quality Trend Monitoring Program is required by the Groundwater Conservation Ordinance (Chapter 33 of the Butte County Code) and administered through the Basin Management Objective (BMO) Ordinance (Chapter 33A of the Butte County Code). Degraded water quality is a common effect of over-utilizing groundwater resources and can occur by saline intrusion from, among other sources, marine formations underlying freshwater aquifers. In Butte County, the primary freshwater bearing formations include the Tuscan Formations, and overlying alluvium deposits, basin deposits, and the Riverbank and Modesto Formations. A number of marine formations beneath the Tuscan Formation make up the underlying saline aquifer system.3 Increasing salinity in groundwater wells could indicate over utilization of groundwater resources. To ensure sustainable management of local groundwater resources, monitoring efforts need to provide baseline trends related to salinity. This program is not designed to characterize specific groundwater contamination due to pollutants. Results are evaluated against established water quality standards and BMOs. Data that fall outside of a BMO for a specific parameter can trigger a BMO Alert Stage. For example, if the temperature is more than five degrees outside of the historical range of measurements a BMO Alert Stage is reached. If the pH is below 6.5 or above 8.5, a BMO Alert Stage is reached. A BMO Alert Stage for electrical conductivity (EC) is reached if the measurements are greater than 900 microsiemens per centimeter (µS/cm) for drinking water or greater than 700 p.S/cm for agricultural water use. These ranges are based on secondary water quality standards established by the US Environmental Protection Agency (US EPA). Secondary standards relate to the taste, odor, color, corrosivity,foaming, and staining properties of water whereas primary standards are based on health considerations. 2018 Results To date, temperature has been relatively consistent in all wells. Temperature is a standard parameter measured when assessing water quality and is important because it affects chemical 3 Fulton,Allan."Seeking an Understanding of the Groundwater Aquifer systems in the Northern Sacramento Valley:An Update".Article No.1— September 2005 101 Page reactions that may occur in groundwater. Also, considerable changes in temperature could be an indication of other source waters migrating into the aquifer system such as stream seepage or flow from a different aquifer system. All but one of the 2018 measurements were within 1.0° Celcius (C) of the average temperature for each well. The Chico Urban well was 3.3 °C higher than the well's recorded 11-year average. The 17-year temperature range for all wells was less than 5°C. The lowest temperature reading was in the Thermalito well (17.8°C) and the highest was in the Chico Urban well (22.6° C). At the Chico Urban well, temperature was recorded from the first sample pulled after purging the well as it was deemed most representative of the temperatures recorded. Measurements for pH remained relatively stable compared to previous years. The lowest pH was found in the Durham/Dayton area well (6.7) and the highest pH was found in the Llano Seco well (7.8). All measurements for pH were well within the secondary water quality thresholds of 6.5 - 8.5. Electrical conductivity(EC) measures the ability of a solution to conduct an electrical current due to the presence of ions. Observed readings for electrical conductivity can have a large range, up to 447 p.S/cm at a particular well (Western Canal-west), yet 2018 measurements were all well within the secondary water quality thresholds established by State and Federal regulatory agencies. The highest EC measurement was from the Esquon well (529 µS/cm) and the lowest was from the Llano Seco well (186 µS/cm). The greatest change compared to 2017 EC levels occurred in the M&T well which decreased in value by 161 µS/cm; however, his well has one of the largest ranges of observed EC levels over its period of record, possibly due to previous varying lengths of time the pump had been run from year to year before sampling prior to establishing an effective purge time for EC stabilization.Appendix D contains a monitoring network map,data tables and graphs. Land Subsidence Land subsidence is a gradual settling or sudden sinking of the Earth's surface owing to subsurface movement of earth materials often caused by groundwater or oil extraction. To date, no inelastic land subsidence has been recorded in Butte County. The potential effects of land subsidence include differential changes in elevation and gradients of stream channels, drains, and water transport structures, failure of water well casings due to compressive stresses generated by compaction of aquifer systems, and compressional strain in engineering structures and houses. Land subsidence in the Sacramento River, San Joaquin River, and Tulare Lake Basins would most likely occur as a result of aquitard consolidation. An aquitard is a saturated geologic unit that is incapable of transmitting significant quantities of water. As the pressure created by the height of water (i.e. head) declines in response to groundwater withdrawals, aquitards between production zones are exposed to increased vertical loads. These loads can cause materials in aquitards to rearrange and consolidate leading to land subsidence. Factors that influence the rate and magnitude of consolidation in aquitards include mineral composition, the amount of prior consolidation, cementation, the degree of aquifer confinement, and aquitard thickness. Subsidence has elastic and iineII,a ...0 deformation components. As the head lowers in the aquifer, the load that was supported by the hydrostatic p„ress„u„re is transferred to the granular skeletal 11 I Page framework of the formation. As long as the increased load on the formation does not exceed the pre-Consollidation pressurE,, the formation will remain elastic. Under elastic conditions, the formation will rebound to its original volume as hydrostatic pressure is restored. However, when the head of the formation is lowered to a point where the load exceeds pre-consolidation pressure, inelastic deformation may occur. Under inelastic consolidation, the formation will undergo a permanent volumetric reduction as water is expelled from aquitards4. Butte County will prevent or limit inelastic subsidence as required through Chapter 33. To determine whether subsidence is occurring, three extensometers measure land surface displacement in Butte County(Figure 5). These extensometers have a period of record beginning in 2005 and continuously monitor for subsidence. Records are available by contacting DWR Northern Region or from the DWR Water Data Library5. To date, no inelastic land subsidence has been recorded in Butte County. "1 ill 1,114101/;Iiiiikly II 11 II II 1 111 ill', ',fis,,,,,illoiell11101110111,111111 1, 1,Piiio\„1011.11,111 110 f irtv, 11f loil1ui /%% Fr � U�� o � p!//'v'fe p�li , 1 1 II III°11150 fl1,2#01E181.00/'11/441,04,1, � r d ]rj,, k @ i 0111 11100,0000000,,,A,Ilio III m t, 1 11010 000, / / 00011 19gr 'N4111'1111 10 1 �fl „ ,i0to 01111,1111), � �, ! 14Jt4 rw is w ��� �t0 .1111k ill i1 y,i'l 1,101M,P,,, r 1101,1. , 10 00.1i ,, ,,t1 0..1;0 ! ”' ON k 110 „olio, ,, 1,1111,1111111111 11. ,,I 41,11111 1„„...*„ ,,,11 1 1111 1,11'10\lilillIlf/1,1111f,1'11'11‘,11,11111‘,11111,1111'11:111,1111 111 Figure 5. Extensometer Locations (daily data available online) Extensometer data is shown in ONOlE1LOO1II o 2004 2006 2008 2010 2012 2014 2016 2018 U.:➢. aii ...0.2 0 0.3 C7 0.4 0.5 4 http://water.usgs.gov/ogw/pubs/fs00165/ 5 http://wdl.water.ca.gov/waterdatalibrary/docs/Hydstra/index.cfm 12 1 P a g E Figure 6 for each monitoring station. For practical purposes, the error in measurements is about +/- 0.01 feet so the graphs include only changes in negative displacement greater than this amount within a 24 hour period indicating subsidence (rather than uplift). Data is available through August 8, 2018. In addition, a Sacramento Valley-wide GPS survey was conducted during 2017. Results of the survey are expected to be available in 2019 and will provide additional land subsidence data to better measure and detect possible subsidence throughout the county. 1 NC)1E35LOO1II 2004 2006 2008 2010 2012 2014 2016 2018 ..• .0.2 cu O ...0. C7 0.4 0.� 19N01E35 00 II 111111111112004 200. 2008 2010 2012 2014 016 2018 0.:➢. aI ...0.2 O 0.3 C7 0.4 0.� 20N01E18L001M 0 2004 2006 2008 2010 2012 2014 2016 2018 0.:➢. ai ...0.2 O 0.3 C7 0.4 0.� Figure 6. Ground Surface Displacement (GSD) in Feet Well Permits 131 Page Well permits are issued by the Butte County Department of Environmental Health for all water wells drilled throughout the county. Although the number of well permit applications does not necessarily reflect the number of wells actually drilled, the numbers provide a general indication of the development of the groundwater resource and potential drilling activities. According to the 2016 Water Inventory and Analysis Report, Butte County has over 12,000 domestic wells and 2,500 irrigation wells. When combined with municipal, monitoring and other well types (stock water, test wells, abandoned, or unidentified wells) the total well count in the county is about 17,5546. Table shows the number of well permit applications received by the Department of Environmental Health for the following categories from 2006 - 2018: Small Diameter, Large Diameter, and Well Repairs and Deepening. Each of the categories is described below Table . Table 3. Number of Well Permit Applications Per Water nnunn Year 7111111411111 1111111, VV mmun 1111111 �Il niniI®i num��i�i `�'i W l ennnnnn ]111110 V�u VV n:00o Ili uN�Uu 11111111111111111111111111111111111111111111111111111 Ann= noV VIum pllmomm i®il Small 260 228 176 188 140 77 1102 221 259 175 129 95 129 Diameter Large Diameter 17 24 36 29 16 16 21 J 28 71 68 37 17 30 Well Repair& 4 9 15 20 10 9 7 10 17 19 10 1 ** Deepening *2006, 2011 and 2017 were wet years, all others are below normal, dry, or critical WYs **The number of well repair and/or deepening in 2018 were not available at the time of reporting and are included in the total number of small and large diameter wells listed Small Diameter-wells with a casing diameter of eight inches or less. Large Diameter-wells with a casing diameter greater than eight inches, generally for irrigation. Well Repairs& Deepening-an existing well is deepened to access groundwater in a deeper zone of the aquifer likely because the water level in the well has fallen below the bottom of the well. Well deepening permits are an indication that the existing well infrastructure is not sufficient given the current groundwater levels. During dry periods and drought as water levels fall in areas with heavy groundwater use (i.e. Durham / Dayton, Vina, Chico Urban Area, etc.), shallower domestic wells become especially vulnerable and may "go dry." This means the groundwater level in the well falls below the elevation of the pump in the well or below the bottom of the well itself. In this case, the pump can be lowered if the well is deep enough and allows for that. This does not require a permit from the County. If the well is not deep enough, it may be possible to deepen it. Well permits are issued for this activity and homeowners should enlist a licensed well driller to conduct the work. Groundwater Level Monitoring Groundwater levels typically fluctuate seasonally and from year to year. Seasonal fluctuation of groundwater levels occur in response to groundwater pumping and recovery, land and water use activities, recharge, and natural discharge. Precipitation, applied irrigation water, local creeks and rivers, and the Thermalito Forebay and Afterbay all recharge groundwater in Butte County. 6 Butte County Water Inventory and Analysis, 2016 141 IP ° Groundwater pumping for irrigation typically occurs April - September although depending on the timing of rainfall, it may shift earlier and later. Consequently, groundwater levels are usually highest in the spring and lowest during the irrigation season in the summer months. Long-term fluctuations occur when there is an imbalance between the volume of water recharged into the aquifer and the volume of water removed from the aquifer, either by extraction or natural discharge to surface water bodies. If, over a period of years, the amount of water recharged to the aquifer exceeds the amount of water removed from the aquifer, then groundwater levels will increase. Conversely, if, over time, the amount of water removed from the aquifer exceeds the amount of water recharged then groundwater levels decline.These long- term changes can be linked to various factors including increased or decreased groundwater extraction or variations in recharge associated with wet or dry hydrologic cycles. Currently 130 wells are monitored for groundwater levels in Butte County as part of the BMO program (79 of them are assigned BMO spring alert levels). These wells consist of a mixture of domestic and irrigation wells, along with dedicated observation wells and ten Cal Water municipal supply wells in Chico and Oroville. Approximately 59 of the wells measured by DWR and the Department are equipped with data loggers (i.e. transducers) which continuously monitor and record hourly changes in groundwater levels. These and the remaining wells are measured by hand four times per-year, in March,July, August, and October. From 2014 to 2016, groundwater levels were measured monthly from April through October due to severe drought conditions. The approximate locations of groundwater level wells monitored in Butte County are shown in Appendix B. The groundwater level monitoring methods are consistent with the procedures described in the Department of Water Resources'Groundwater Elevation Monitoring Guidelines (December 2010). Groundwater elevations are measured using a steel tape,electric sounder, or by transducers.The accuracy of the groundwater level measurement ranges from 0.01 feet to 0.1 feet is approximately one-tenth of a foot. In addition to the groundwater level monitoring conducted by Butte County and the DWR, California Water Service Company currently measures monthly groundwater levels in approximately sixty municipal groundwater supply wells in the Chico Urban and Oroville areas. Ten of these wells are included in the BMO program and assigned alert stages. Data from groundwater level monitoring can be obtained through DWR and the Department's websites. The primary access to the data is through the California Statewide Groundwater Elevation Monitoring (CASGEM) program (https://water.ca.gov/Programs/Groundwater- Management/Groundwater-Elevation-Monitoring--CASGEM). The CASGEM program was part of legislation passed in 2009, SBx7-6, which mandates statewide groundwater elevation monitoring to track seasonal and long-term trends in basins throughout the state. As a result of this legislation, DWR migrated the groundwater level data from the Water Data Library (WDL) to the CASGEM database. DWR has reintroduced access to groundwater monitoring data through an updated WDL (http://wdl.water.ca.gov/waterdatalibrary/). Groundwater level data is also 7 https://water.ca.gov/-/media/DWR-Website/Web-Pages/Programs/Groundwater- Management/CASGEM/Files/CASGEM-DWR-GW-Guidelines-Final-121510.pdf 151 Page available through DWR's online SGMA Data Viewer tool (https://sgma.water.ca.gov/webgis/?appid=SGMADataViewer). Summary data tables of groundwater surface elevations from spring, summer, and fall measurements are included in Appendix E and are available from the Department's website. Change in Groundwater Levels: 2017 to 2018 The 2018 WY was classified as a below normal year with relatively dry conditions as measured by the Northern Sierra 8 Station Index. Groundwater conditions responded as expected to the dry winter as compared to the previous WY which was recorded as the wettest year on record with generally lower groundwater levels in 2018 compared to 2017. The overall average change in observed groundwater levels from spring 2017 to spring 2018 was a decrease of three feet. Of the 117 comparable wells, 19 of them had a higher spring level compared to 2017. The average increase was 2.4 feet and of the 95 wells that had lower measurements in 2018 compared to 2017, the average decrease was about 4.1 feet (Table ). The below normal winter conditions of WY 2018 which followed the wettest WY on record yet, led to lower groundwater levels, particularly in the areas to the east of Chico, CA and Durham, CA areas which also experienced some of the greatest declines during the 2012-2015 drought period. In general, decreases in groundwater levels throughout the basin in 2018 were in line with the declines observed in dry and critical WYs (from spring 2013 to spring 2015 depending on the site), and although this WY followed the wettest year on record, the 2017 WY conditions were not enough to compensate for the cumulative effect of multiple dry years of the drought. Table 4. Groundwater Elevation Change - Spring 2017 to Spring 2018 Number of Wells Change (ft) SIU 117 Average GWL Change -3.0 Median GWL Change -2.6 19 Average Increase 2.4 Median Increase 1.4 Max Increase 12.1 Wyandotte Creek 95 Average Decrease -4.1 Median Decrease -3.3 Max Decrease -13.1 Wyandotte Creek Note: Groundwater level measurements characterized as "Questionable measurements" i.e. measurements taken during pumping, when nearby pumps were operating or taken from wells pumped recently were not included and five wells measured had no groundwater level change between Spring of 2017 and Spring of 2018 Summer measurements, as required by Chapter 33A, are conducted in July and August each year during peak pumping for irrigation. This results in more questionable measurements because measured or nearby wells are more likely to be pumping during the irrigation season than in the spring or fall. However, a number of wells in certain areas have a qualitative BMO related to maintaining summer groundwater levels at a level that will assure an adequate and affordable irrigation groundwater supply. Therefore, even though the data is less consistent because of 161 IP ° direct pumping effects on water elevations, it provides a baseline for summer groundwater conditions on a regional scale. The summer groundwater levels in 2018 were 3.7 feet higher on average compared to groundwater levels in 2017 Table ). Even with questionable measurements included, these measurements and comparisons primarily reflect static groundwater conditions (non-pumping). Table 5. Groundwater Elevation Change - Summer 2017 to Summer 2018 Number of wells Change(fit.) Area 113 Average GWL Change -3.7 Median GWL Change -3.7 18 Average Increase 1.2 Median Increase 0.5 Max Increase 7.5 Vina South 94 Average Decrease -4.7 Median Decrease -44 Max Decrease -18.2 Vina South Note: Groundwater level measurements characterized as "Questionable measurements" i.e. measurements taken during pumping,when nearby pumps were operating or taken from wells pumped recently are included in the data due to the frequency of these observed field conditions and one well measured had no groundwater level change between Summer of 2017 and Summer of 2018. Like spring levels, fall water levels in 2018 decreased in most areas compared to 2017 fall levels by an overall average change of 1.3 feet (Table 3). Of the 121 comparable well measurements, 19 of them had a higher 2017 fall level (average increase of 1.9 feet)than the corresponding 2017 fall measurement. Of the 99 measurements that were lower in 2018 compared to 2017, the average decrease was 2.6 feet. Hydrographs of individual groundwater level conditions in specific wells provide greater historical context for groundwater level trends (https://sgma.water.ca.gov/webgis/?appid=SGMADataViewer) and the groundwater level change maps (Appendix F) show where the greatest changes occurred. 171 IPE Table 3. Groundwater Elevation Change - Fall 2017 to Fall 2018 Number of wells Change(ft.) Area 121 Average GWL Change -1.3 Median GWL Change -1.8 19 Average Increase 1.9 Median Increase 1.5 Max Increase 5.0 Wyandotte Crk. Oroville 99 Average Decrease -2.6 i ,,. ..Medan Decrease crease -2.4 Max Decrease -10.2 Butte Note: Groundwater level measurements characterized as "Questionable measurements" i.e. measurements taken during pumping, when nearby pumps were operating or taken from wells pumped recently are not included in the data and three wells measured had no groundwater level change between Fall of 2017 and Fall of 2018. Seasonal Groundwater Level Change In areas dependent on groundwater supplies for irrigation, groundwater levels decline as pumps turn on and the irrigation season progresses. To capture the effect of irrigation season pumping on groundwater conditions, summer levels are compared to spring levels of the same year. Table compares groundwater levels in spring 2018 to summer 2018. Overall, the average decrease from spring of 2018 to summer of 2018 was 11.1 feet. Table 7. Groundwater Elevation Change - Spring 2018 to Average Summer 2018 Number of wells Change(ft) Area. 122 Average GWL Change -10.4 Median GWL Change -10.1 6 Average Increase 1.1 Median Increase 0.4 Max Increase 3.5 Butte 115 Average Decrease -11.1 Median Decrease -10.6 Max Decrease -38.3 Vina South Note: Groundwater level measurements characterized as "Questionable measurements" i.e. measurements taken during pumping, when nearby pumps were operating or taken from wells pumped recently are included in the data due to the frequency of these observed field conditions and one well measured had no groundwater level change between Fall of 2017 and Fall of 2018. Basin Management Objectives (BMOs) BMOs are established for most of the wells in the monitoring network (79 of 130 wells for spring measurements and 66 of 129 for fall). BMOs are determined from historical data collected for the specific well. When a measurement fails to achieve the BMO for the well, a BMO Alert Stage 18 I IP g r is reached. When a BMO Alert Stage is reached, the Department increases outreach to stakeholders, seeks an evaluation by the Technical Advisory Committee and may conduct additional monitoring. Under the BMO program, stakeholders participate in the evaluation and outreach of BMO data,and this will continue throughout the BMO program transition into a more relevant and enforceable the next year.The BMOs provide a standardized way to evaluate spring and fall changes in groundwater levels. Two methods are used to determine BMOs, as described in Chapter 33A. Historic Range Method This method has two procedures depending upon the period of record for the well. The first procedure is for wells that have a period of record dating back to at least 1970. Measurements up through 2006 are used to set the BMO. The BMO is set by taking the historical low reading and adding 20% of the range of measurements, calculated from the first year on record through 2006. Measurements below the BMO and above the historical low would indicate an Alert Stage 1. Measurements at or below the historical low would indicate an Alert Stage 2. The measurements plotted after 2006 are for reference purposes only, and are not included in the calculation of the range. The second procedure is for wells that have a period of record beginning after 1970. For these wells, the historical low measurement prior to 2006 indicates an Alert Stage 1. The historical low measurement minus the range of measurements indicates an Alert Stage 2. The measurements plotted after 2006 again are for reference purposes only, and are not included in the calculation of the range. Specific Depth Method For this method, the BMO is set at five feet below the average spring groundwater level calculated for the well. An Alert Stage 1 is reached if the spring measurement falls five feet below the average groundwater level (calculated from the first year on record through 2006). An Alert Stage 2 is reached if spring groundwater levels, for a second consecutive year, remain five feet below the average groundwater level established for the well. An Alert Stage 3 is reached if the spring groundwater level falls ten feet below the average spring groundwater level established for the well. All of the SlUs previously established for this program utilize the historical range method, except for Richvale and Western Canal which use the specific depth method. The specific depth method does not have corresponding fall BMOs. Summary of Alert Stages Reached A number of wells reached Alert Stages for both spring and fall BMOs in 2018. No wells reached an Alert Stage 3 (specific depth method only). The number of wells at an Alert Stage for 2008- 2018 spring and fall BMOs are shown in Table 4 and Table 5, respectively. Table 4. Spring BMO Alert Stages om L,11 1'1111 . '' TED loom ,�' � �� �I1I M °�IV r 1 IIJ iol � 1 11041‘ °�IV I1I *oull �IV IV Alert 1 26 31 25 24 25 20 24 21 17 13 17 Alert 2 0 6 3 0 4 15 21 25 25 11 19 191 IPE Alert 3 0 0 0 0 0 0 0 0 0 0 0 Total 26 37 28 24 29 35 45 46 42 24 36 Table 5. Fall BMO Alert Stages 00 ur union 00000100000 000001 0000110000 oolor 001r p error op op ou II, p pruo p or pruo Imo p pruo 00 or000000 rum ou ou ou um ou Ho ou um uou noun Alert 1 27 29 24 7 26 23 21 16 21 22 23 Alert 2 2 1 2 2 6 16 19 25 18 8 13 Total 29 30 26 9 32 39 40 41 39 30 36 *Alert 3 only applies to spring measurements Additional details on groundwater conditions for specific wells can be found in the DWR SGMA Data viewer tool (https://sgma.water.ca.gov/webgis/?appid=SGMADataViewer). Previous annual reports included individual BMO reports prepared for the sixteen SlUs in Butte County located in one of four groundwater sub-basins: Wyandotte Creek, East Butte, West Butte, and Vina. As the Department continues to adaptively manage SGMA responsibilities and transition this annual report to meet GSP requirements some changes are underway including the removal of individual SIU BMO reports from the annual report. Future annual reports/GSPs will provide information regarding groundwater conditions and the sustainability of current and future groundwater management will be not only be more relevant, but also more enforceable. The BMO reports from previous annual reports can be accessed from the Department's website under 'REPORTS' then 'GROUNDWATER STATUS REPORT' and 'View Previous Reports' at: http://www.buttecounty.net/waterresourceconservation. 20 I II d go Groundwater Status Report AI 1001 000I 0000" """ ' un° 0000 000 1 x A Well Numbering System Butte 0 nunty \/Vat lr an Illinsura 1 0 unnIrvalin un APPENDIX A WELL NUMBERING SYSTEMS To develop the groundwater level BMOs, all existing monitoring wells were identified for each BMO sub-inventory unit. These wells are currently monitored either by public or private entities within a given sub-inventory unit, or they are monitored as part of the DWR, Northern District groundwater levels monitoring program. To distinguish and locate these monitored wells an alphanumeric name, or ID, is used. All BMO Key Wells identified for each sub-inventory unit are referenced by these unique ID's. Wells that are not part of the DWR monitoring network are typically assigned a local ID. Wells that are part of the DWR monitoring network are identified by the State Well Numbering System. This system is very useful in locating points on the ground, such as groundwater wells in areas with few identifying landmarks. Under this system, each well is assigned a unique number referred to as the State Well Number. This system is described further below. State Well Numbering System (Reference: Water Facts:Numbering Water Wells in California, No. 7, June 2000) The State's well-numbering system is based on a rectangular system called the "United States System of Surveying in the Public Lands," commonly referred to as the "Public Lands Survey," established by the Continental Congress in 1784. The Public Lands Survey system has been employed by DWR, USGS, and other agencies for over 50 years. This system allows for a unique ID to be assigned to each well. These unique ID's are made up of several components, each of which is described below. Initial Point and Corresponding Base & Meridian Pair. Under this system all tracts of land are referenced to an Initial Point. This Initial Point is defined by the intersection of a north-south line called the Meridian and an east-west line called the Base. In California there are three Initial Points each with a corresponding Base and Meridian Pair, and all of the BMO Key Wells are referenced to the Mt. Diablo Base and Meridian. Range and Township Lines. Longitudinal lines are established at six-mile increments from the Initial Point and are east or west of the Meridian. These longitudinal lines are called Range Lines. Latitudinal lines also set at six-mile increments from the Initial Point are parallel to, and north or south of the Base. These latitudinal lines are known as Township Lines. This pattern of longitudinal and latitudinal lines defines a grid pattern consisting of 36-square-mile parcels of land. These 36-square-mile parcels are referred to as Townships. Each Township is referenced to an Initial Point by the number of 36-square-mile parcels and direction from that Initial Point. Sections. Every Township is further divided in to 36 parts called Sections. A Section is a square parcel of land one-mile on a side, containing 640 acres. Tract. Each Section is further divided into sixteen 40-acre parcels called Tracts. Each Tract is labeled with a letter. Once the well's location is established in the 40-acre Tract it is assigned a Sequence Number. These Sequence Numbers are assigned in chronological order (see Figure G). State Well Number. The State Well Number is composed of the various components described above, including Township, Range, Section, Tract, Sequence Number, and Base & Meridian Pair. 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Vin North No Meas. 0 • • • 1 0 -‘, 000,?k! \ , --------- Highway ( i Primary Streams • rfflomili,00,,,,,,, , , burtA /H 1 ,,, $ ,igo 16,,ogipf•vo•rio,„,„,,,, ' '' , Management Areas \ \ Vi I.6' '77')'''''7 7 '''' oilt\i'V\111illltli I\ILTi)lilf i tflotililtiiiiiii) na North . ,iiw,1000,00„\ k„0,00,L001,,,0000,00 040i1•4,410t,;41(0000i,„,f,01,1)04,1;,,O!,,,„ •,, ,,,,,,,t,,,,,,, 141','10110t,,',,,,r,hillk;Oillisq1111i'llfill0014)iiiitill 1 Vi na Chico '''i\IIIIN10, 111hovillci;o1"trtl?/01il!litl'0),,, na South (,,, A Vi , Butte Basin 0 1 , Wyandotte Creek Oroville A E Wyandotte Creek South , l'4,,f AAA ) na So 0 - G '•,4' ' ''' / —...., 1 ) .1 (, E E , ,. il /,/, , ; , if 1 i •j ' , ' 1 , , 11,, • i 'Wy/aticti 11 tv/) rk 1 /ra I i , Butte B.). in Biitt, it, , All . 1 i _ S I Iltr,,1,1$ / 0 A 1 , ' C andotte k e II , ,.., • fr H ., South , - \ - / , , , 0 r , rr, ., r' y r, 0 111 0 \i Sources: Esri, HERE, Garmiro, Intermap, increment P Corp., GEBCO, USGS, N / 40 1 2 4 6 8 FAO, NPS, NRCAN GeoBas:e, IGN, Kadaster NL,Ordnance Survey, Esri Japan, Miles METI, Esri Chliha((Hiorig Kon ),swisstopo,©OpenStreetMap contributors,and the , GIS User Community I Groundwater Status Report „A 1 111 „ „ 000 „ , 0001 ' 1 0001 I ' ,, „ :"„ 1 000 1 IV Water Quality Trend Monitoring Report Butte 0 nunty \/Vat lr an Illinsura 1 0 unnIrvalin un Water and Resource Conservation Paul Gosselin, Director // // 11%' 308 Nelson Avenue T: 530.538.4343 buttecounty.net/waterresourceconservation Butte County j Oroville, California 95965 F: 530.538.3807 bcwater@buttecounty.net WATER&RESOURCE,CONSERVATION'''..... INTERDEPARTMENTAL MEMORANDUM TO: Butte County Water Commission FROM: Kelly Peterson,Water Resources Scientist SUBJECT: 2018 Groundwater Quality Trend Monitoring Update DATE: August 24, 2018 INTRODUCTION AND BACKGROUND The Butte County Department of Water and Resource Conservation (DW&RC) conducted its seventeenth year of groundwater quality trend monitoring within the county July 23-26, 2018. As required by Chapter 33A,the parameters monitored were temperature, pH, and electrical conductivity(EC).These parameters are the basic water quality characteristics needed to evaluate a basin for evidence of saline intrusion.The groundwater quality trend monitoring serves to establish baseline levels for these parameters throughout the county so that any future changes can be identified and further investigation and/or monitoring can subsequently be developed. In 2018, all samples fell within the acceptable range of water quality values set forth by State and Federal agencies and alert stages defined in Chapter 33A. METHODOLOGY AND RESULTS In 2013, DW&RC purchased a Hach HQd portable meter with a pH and conductivity probe. This was the sixth year this meter was used to do the groundwater quality testing. The sites visited in Butte County are on private land and many of the wells are used for agricultural purposes (irrigating orchards, rice, or pasture). However,the two Thermalito wells, Chico Urban Area well,Vina well, and the Llano Seco well provide domestic water supply.The sampling grid spans from north of the Chico Urban Area (Vina sub-inventory unit), west towards the Sacramento River (Llano Seco and M&T sub-inventory units), east towards the foothills (Pentz sub-inventory unit), and south towards Gridley (Biggs-West Gridley sub-inventory unit). Figure 1 shows the approximate locations of the water quality wells in relation to wells monitored four times per year for groundwater level in the Basin Management Objectives Program. As in previous years,we are fortunate to have support and permission from local property owners who coordinate timing of sampling and allow access to their wells.We have provided them with the preliminary results from this year's monitoring. Twelve of the thirteen wells in the network were sampled this year. The Western Canal (West)well was inaccessible due to irrigation infrastructure changes that prevented sampling. It is expected that sampling at this location will resume next year. Following standard sampling procedures, a water sample is pulled from a discharge location at or near the well and values for temperature, pH and EC are recorded when the pH reading from three subsequent water samples stabilizes.Temperature is a standard parameter measured when assessing water quality, mostly to indicate that water being sampled is representative of aquifer water and not water standing in the well itself. The US Environmental Protection Agency(US EPA) establishes drinking water quality standards using two categories, Primary Standards and Secondary Standards'. Primary Standards are based on health considerations and Secondary Standards are based on taste, odor, color, corrosivity,foaming, and staining properties of water. Secondary water quality thresholds for pH and EC compared to the range of 2018 values are presented in Table 1. Table 1. US EPA Secondary Standards for measured parameters Parameter Secondary Standard or Range of Secondary WQ Threshold 2018 Values Notes re: Butte County Results pH 6.5 to 8.5 6.7-7.8 Within range of secondary water quality thresholds. Electrical < 900 pS/cm—drinking water Within range of secondary water quality Conductivity (EC) < 700 pS/cm—ag water 186 529 thresholds. Water quality data for specific wells is presented in tables and graphs on the following pages. Temperature is an important parameter because it affects chemical reactions that may occur in groundwater. Also, considerable changes in temperature could be an indication of other source waters migrating into the aquifer system such as stream seepage or flow from a different aquifer system. To date,temperature has been relatively consistent in all wells. Chapter 33A states that "the BMO Alert Stage for temperature will be reached when the measurement is more than five (5) degrees outside of the historic range of measurements."The 2018 measurements were all within 5.0°C of the historic range of measurements for each well. The 17 year temperature range for all wells is also less than 5 °C(Table 3).The lowest temperature reading was in the Thermalito well (17.8 °C) and the highest recorded temperature was in the Chico Urban well (22.6 °C). At the Chico Urban well,temperature was recorded from the first sample pulled after purging the well as it was deemed most representative of the temperatures recorded. Measurements for pH remained relatively stable compared to previous years (see attached graphs). The lowest pH was found in the Durham Dayton area at 6.7 and the highest was found in the Llano Seco well (7.8). All measurements for pH were well within the secondary water quality thresholds of 6.5 -8.5 (Table 1,Table 4 and included graphs). Electrical conductivity (EC) measures the ability of a solution to conduct an electrical current due to the presence of ions. Observed readings for electrical conductivity can have a large range, up to 447 p.S/cm at a particular well (Western Canal-west), yet 2018 measurements were all well within the secondary water quality thresholds established by State and Federal regulatory agencies(Table 1,Table 6, and included graphs).The highest EC measurement was from the Esquon well (529 p.S/cm) and the lowest was from the Llano Seco well (186 p.S/cm). CONCLUSIONS This was the seventeenth season the DW&RC collected groundwater quality information. Overall, the results of the water quality sampling indicate no significant changes in groundwater quality with respect to temperature, pH, or electrical conductivity. The greatest change compared to 2017 EC levels occurred in the M&T well which dropped in value by 161 p.S/cm. This well has one of the largest ranges of observed EC levels over the period of record. Per staff recommendations last year,when this well was sampled this year,efforts were made to sample regularly over a longer period of time than the standard minimum 15 minutes used to purge the well before sampling. This effort was taken to establish the amount of time required for pH and EC to stabilize in this well. It was determined that this well should be purged for approximately one hour before sampling to allow for the pH and EC levels to stabilize. Staff recommends ' http://wwweepaegov/safewater/consumer/2ndstandardsehtml 2 that next year, this well be sampled with EC measurements recorded from one hour after the start of the pump until EC levels stabilize for this well. It is possible that the large range in observed EC values in this well over previous years is due to varying lengths of time the pump was running from year to year before a sample was taken. This topic can be further discussed with the TAC at their upcoming meeting in November. Water quality parameters have naturally occurring variability, so year to year changes are expected and nothing in this year's measurements gives cause for concern or immediate further investigation or analysis. Further investigation would be advisable if values were to fall outside of the acceptable range. The focus of this trend monitoring program is to evaluate the basin for evidence of saline intrusion. No major shifts occurred in the EC measurements in the sampled wells and the basin appears to be free of saline intrusion in these areas. This data continues to help establish baseline levels for these parameters across the county so that any future changes in water quality can be evaluated and further investigation and/or monitoring can be developed. Further information on water quality standards for different constituents can be found at www,swrcb,ca,gov or in the Compilation of Water Quality Goals, published by the State Water Resources Control Board. 3 Figure 1.Approximate well locations for water quality wells in relation to wells monitored annually(four times) for water level. BUTTE COUNTYlir Basin Management Objective Water Quality Qend Monitoring Grid V • 1' e a o i VINA 0 / 4� a 0 ',G ,. �'o,, CHICiQ'�d„I�tB�'N„„„..w� FOO TMiu. DURHAMr e DAYTONt „�, ,. o 01 ', M+T e PENTZ r ' -, l`M_p „ �..... " DURHAM/ DAYTO�N °�� ��,, f�� � , ANGEL 0 w ESQUON , ° � t SLOUGH b,NE'ROIE • i 0 LLANO ECO 0 t,tt 4 WESTERN CANAL 7 0 0 Legend le 1 llt ® o BMO Groundwater Level Wells ® ' � �"'" "�.,"" '�"" "�." Water Quality-Well Name lli,4_,41.'''''"-e" t ERMALITO Biggs-West Gridley r�u C Cherokee RICHVALE `'� sb' Chico Urban Area �`J Durham Dayton e e f "P Esquon 0 �� WYANDOTTE i t Llano Seco CREEK BIGGS- o ' l' Pentz a WEST GRIDDILEY I Pentz-Butte Valley 0 BUTTE r t»,I Thermalito Thormalito domestic U a Vine BUTTE SINK 0 �� J Western Canal(east) k Western Canal(west) 1 $Miles N II Updated 2018 4 DATA TABLES AND GRAPHS Table 2.Annual groundwater temperature(°C) Sub-Inventory Unit 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Biggs-West Gridley 18.5 18.5 18.1 20.5 18.2 18.3 18.7 19.0 19.2 20.1 18.0 18.4 19.0 18.5 18.4 18.6 19.3 Cherokee 22.4 21.9 21.2 21.4 21.1 20.7 21.0 20.9 21.9 21.8 21.8 21.3 21.9 21.2 20.8 21.2 21.3 Chico Urban Area 18.4 20.1 18.2 18.8 19.5 21.6 18.0 NM 18.4 17.8 19.0 22.6 Durham Dayton 18.8 19.9 21.8 20.4 17.4 NM 19.3 NM 18.9 18.0 NM 18.5 19.1 18.1 18.0 18.8 19.9 Esquon 19.7 18.9 19.6 20.1 20.7 19.0 19.6 19.0 19.1 20.0 21.4 18.1 20.2 18.9 18.0 19.1 18.6 Llano Seco 20.8 20.6 20.7 20.6 21.7 20.4 23.5 19.9 20.0 19.9 20.1 M&T 17.6 18.2 17.8 19.2 18.6 18.0 17.7 18.6 17.8 NM 18.3 17.9 NM 17.1 17.2 17.2 17.9 Pent 22.2 21.5 21.3 21.5 23.9 21.9 21.9 21.9 21.5 21.5 21.6 22.1 *Pentz-Butte Valley 27.0 26.4 26.7 23.2 Thermalito 18.3 17.9 17.1 17.1 18.4 17.7 18.9 17.6 NM NM 17.8 17.3 17.5 17.3 17.4 17.5 17.8 Thermalito(domestic) 19.4 19.4 19.4 NM NM 19.8 NM 19.9 19.8 20.0 20.3 Vina 19.6 20.3 19.2 19.2 19.6 18.9 19.6 18.9 18.8 22.8 18.8 20.2 21.4 19.5 19.8 19.5 20.5 Western Canal(East) 18.4 18.2 19.9 20.5 18.8 18.6 19.1 19.0 18.8 19.0 NM 18.3 18.9 18.5 19.1 18.6 20.1 Western Canal(West) 19.0 18.1 19.8 20.8 18.5 20.6 21.8 18.5 19.1 20.5 20.1 19.1 20.2 18.6 18.8 NM NM *Pentz-Butte Valley well discontinued in 2006 and NM-No measurement Table 3. Groundwater temperature average and range over 17 year sampling period (°C) Sub-Inventory Unit Average Range Biggs-West Gridley 18.8 2.5 Cherokee 21.4 1.7 Chico Urban Area 19.3 4.8 Durham Dayton 19.1 4.4 Esquon 19.4 3.4 Llano Seco 20.7 3.6 M &T 17.9 2.1 Pentz 21.9 2.6 *Pentz-Butte Valley 25.8 3.8 Thermalito 17.7 1.8 Thermalito 19.8 0.9 (domestic) Vina 19.8 4.0 Western Canal 19.0 2.3 (East) Western Canal 19.6 3.7 (West) 5 Table 4.Annual groundwater pH Sub-Inventory Unit 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Biggs-West Gridley 7.6 7.5 7.5 7.0 7.6 7.6 7.7 7.9 7.9 7.2 7.9 7.9 7.1 7.6 7.6 7.7 7.7 Cherokee 7.5 7.5 7.1 7.4 7.4 7.3 7.3 7.3 7.2 7.6 7.3 7.3 6.9 7.2 7.2 7.1 6.9 Chico Urban Area 6.9 6.9 6.9 7.0 7.5 7.3 7.1 NM 6.9 7.0 7.0 7.1 Durham Dayton 7.7 7.2 7.6 7.6 7.5 NM 7.5 NM 7.4 7.7 NM 7.5 NM 7.5 7.5 7.3 6.7 Esquon 7.3 7.5 7.1 7.4 7.5 7.4 7.2 7.4 7.4 7.6 7.2 7.3 5.9 7.4 7.2 7.3 6.9 Llano Seco 7.9 8.1 8.2 8.1 7.9 8.0 7.0 7.8 7.8 7.7 7.8 M&T 7.2 7.5 6.9 7.8 7.9 7.6 7.7 7.6 7.6 NM 7.2 7.9 NM 7.4 7.7 7.6 7.6 Pentz 7.6 7.4 7.5 7.4 7.3 7.8 7.5 6.7 7.0 7.4 7.2 7.3 'Pentz-Butte Valley 7.1 6.9 7.3 6.2 Thermalito 7.0 6.5 7.1 7.1 7.9 7.4 7.4 7.4 NM NM 8.0 7.7 7.5 7.1 7.1 7.1 7.4 Thermalito domestic 7.7 7.8 7.7 NM NM 7.8 NM 6.9 7.6 7.6 7.4 Viva 7.5 7.6 6.9 6.2 7.7 7.5 7.5 7.4 7.6 8.0 7.3 7.8 7.9 7.1 7.4 7.3 7.4 Western Canal(East) 7.0 6.6 6.8 6.9 7.3 6.9 7.0 7.0 7.1 7.0 NM 7.2 6.5 7.1 7.0 7.0 7.0 Western Canal(West) 7.8 8.1 7.1 6.9 7.9 7.9 7.8 6.6 7.8 7.5 7.7 7.5 7.1 7.5 7.4 NM NM *Pentz-Butte Valley well discontinued in 2006 and NM-No measurement Table 5. Groundwater pH average and range over 17 year sampling period Sub-Inventory Unit Average Range Biggs-West Gridley 7.6 0.9 Cherokee 7.3 0.7 Chico Urban Area 7.0 0.7 Durham Dayton 7.4 1.1 Esquon 7.2 1.6 Llano Seco 7.8 1.1 M &T 7.6 1.0 Pentz 7.3 1.1 *Pentz-Butte Valley 6.9 1.1 Thermalito 7.3 1.5 Thermalito domestic 7.6 1.0 Vina 7.4 1.8 Western Canal (East) 7.0 0.8 Western Canal (West) 7.5 1.5 6 Table 6. Annual groundwater Electrical Conductivity(µS/cm) Sub-Inventory Unit 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Biggs-West Gridley 346 370 323 361 351 382 354 331 343 320 300 291 326 288 296 290 297 Cherokee 222 232 215 266 242 267 268 243 270 275 245 260 330 255 261 284 293 Chico Urban Area 280 291 260 249 250 248 217 NM 214 221 254 295 Durham Dayton 315 348 259 340 322 NM 327 NM 307 315 NM 298 304 322 316 322 355 Esquon 388 526 470 557 507 480 439 419 427 415 408 512 443 417 499 416 529 Llano Seco 204 195 196 198 192 184 240 180 182 179 186 M&T 418 551 678 504 465 451 667 445 592 NM 427 391 NM 362 333 498 337 Pent 218 229 227 225 224 204 204 231 210 204 207 213 *Pent-Butte Valley 195 186 211 240 Thermalito 132 164 149 150 152 242 205 158 NM NM 292 179 181 136 159 136 204 Thermalito domestic 374 350 354 NM NM 342 NM 320 324 327 333 Vina 197 225 180 216 192 224 203 200 199 194 174 188 201 200 186 181 190 Western Canal(East) 447 344 400 524 492 471 482 488 465 459 NM 447 442 449 444 441 422 Western Canal(West) 464 248 407 501 309 477 469 462 455 460 630 629 695 428 581 NM NM *Pentz-Butte Valley well discontinued in 2006 and NM—No measurement Table 7. Groundwater EC(µS/cm) average and range over 17 year sampling period Sub-Inventory Unit Average Range Biggs-West Gridley 330 94 Cherokee 258 115 Chico Urban Area 248 77 Durham Dayton 315 89 Esquon 458 169 Llano Seco 195 61 M&T 484 345 Pe ntz 217 27 *Pentz-Butte Valley 208 54 Thermalito 174 160 Thermalito domestic 342 54 Vina 197 51 Western Canal (East) 453 180 Western Canal (West) 481 447 7 Annual Electrical Conductivity(pS/cm)and pH for each water quality sampling well. The red dashed line indicates the preferred maximum level for EC and the black dashed lines bound the acceptable pH range, 6.5-8.5. Therefore, when the red plot of EC values is below the red dashed line (as it always is), then measured EC is within the secondary standard for agricultural water(< 700 pS/cm), which is more restrictive than for drinking water (< 900 pS/cm). To be within the acceptable pH range, the solid black line should be within the black dashed lines. Biggs-West Gridley 720 9.0 EC=70014 620 .. .... �.._ �... 8.5 pH=8.' :15 520 8.0 420 . 7.5 m �491� 0 fil 1NIVI1° 0 .u�btll4 1111 � Vigo VI�1ddl,.,� 7.0 �l" op X19119 ' MVV w 220 6.5 "' pH=6.5 120 6.0 2002 2004 2006 2008 2010 2012 2014 2016 2018 Year EC —411—pH Cherokee 7209.0 EC=700 �.�., �� — z pH=8.5 .g 520 .,........ 8.0 420 7.5 a V (73 320 111o1S.. 7.0 �' .0 . .'w Vllll6 9111111 �oo �O119 11 411 w 220 °C,,:gdiu NVVV VVOV No w 6.5 pH=6.5 120 6.0 2002 2004 2006 2008 2010 2012 2014 2016 2018 Year - —EC ....••••pH Chico Urban Area 720 9.0 EC=700 620 on* _. 8.5 pH=8.5 520 . ........ 8.0 420 ....... 7.5 a c 0 u 3207.0 220 pH_6�MO� .4M104 EVIG .119 . dliii4 n o° mm MS1lli, 5.. 6.5 120 ......................................................................................................................_.................................................................................................... 6.0 2007 2009 2011 2013 2015 2017 Year EC ••••••••pH 8 Durham Dayton 720 9.0 in 620 ....� .—.....—....,�.....�.._---- ....—....—..... ----,�......�.....—......---- ...—.... ... 8.5 pH=8.5 }520 8.0 tS 320 @u 1111'111111'11 "1ID 10l 1111 VIII 111111111 dVV, ,1111 S47.0 w pH=6.5 120 6.0 2002 2004 2006 2008 2010 2012 2014 2016 2018 Year n1111„—EC —411—pH Esquon 720 9.0 EC=700 in620 ......... ........., ......... ......... ......... 8.5 • 520lll 100011, I',.�,�e�IN�h� "'NO�V�� pVllll� SS1107.5 .4�1�. v,.SISOM_.,�.,yuoVl Nti .. o ...• 11011 7.0 • 320 6.5 pH=6.5 w 220 ............. ............. ............. ............. ............. 6.0 120 .,m,m..m..m m,m,m m,m,m,m.m m,..,m,m,m,m,m,.m,.m,m,m,m,m,m. .m,m,m,m,m,m,_r,m,m,m,m,m,m,mrm,m,m, 5.5 2002 2004 2006 2008 2010 2012 2014 2016 2018 Year EC pH Llano Seco 7209.0 EC=700 pH=8.5 4 :: .............................................................................................................................................................. 7.5 n. Tr, 320 7.0 u •t" _ pH=6.5 w 220 �---- — 6.5 �IVIO �1SII � 1��f 1111111 �1lSP 1�h11W �Nqp'.. NN W 120 6.0 2008 2010 2012 2014 2016 2018 Year EC —10—pH .......................................................................................................................................................................................................................................................................................................... NOTE: The red dashed line indicates the preferred maximum level for EC and the black dashed lines bound the acceptable pH range, 6.5-8.5. Therefore, when the red plot of EC values is below the red dashed line(as it always is),then measured EC is within the secondary standard for agricultural water(<700 pS/cm),which is more restrictive than for drinking water(< 900 pS/cm). To be within the acceptable pH range, the solid black line should be within the black dashed lines. 9 M &T 720 70,17 9.0 620 ,IIi!:Vo. EC 700 > 5201111111 -- pH=8. ._.. 8.0 G 420 III IP ...., YIIIIN - a 7.s = 6 0111 320 .,........ ........ �I ............. 1� 7.0 220 - .-..—....—....—...—..... —.... —.... — 6.s w pH=6.5 120 6.0 2002 2004 2006 2008 2010 2012 2014 2016 2018 Year EC —4—pH Pentz 720 9.0 EC=700 `". 620 .. .... .. 8.5 pH=8.5 520 Peutz Wel....,. 8.0 29103.. Butte Valley 420 ...Wel.-26E0-1 7.5 320 7.0 Vir w220 � �Nr�l° mu�u ,„1tl 'N42N 11,1,111, 41Ni.. low .,1111'' ,� � 57oh 6.5 120 .... 6.0 2002 2004 2006 2008 2010 2012 2014 2016 2018 Year -111111,11 EC —4—pH Thermalito 720 9.0 EC=700 v5620 .. _.. - —... ..—....—_..�..,�...—_.—....—,...—_.., . 8.s o. pH=8.5 520 .......... 8.0 v 420 7.5 = a u �II 320 7.0 _ . b 17.5.10' 4111,,, v 220 -7111'0:01:7111111111741 Pwll� 6.s �lVl4 °a0W0N SINIVY N0@ Ilii 120 1111,11 ... 11W 6.0 2002 2004 2006 2008 2010 2012 2014 2016 2018 Year 11101 EC —4—pH NOTE: The red dashed line indicates the preferred maximum level for EC and the black dashed lines bound the acceptable pH range, 6.5-8.5. Therefore, when the red plot of EC values is below the red dashed line(as it always is),then measured EC is within the secondary standard for agricultural water(<700 pS/cm),which is more restrictive than for drinking water(< 900 pS/cm). To be within the acceptable pH range, the solid black line should be within the black dashed lines. 10 Vina 720 ...m.......m 9.0 , 620 . _ AM 8.5 c. pH=8.5 520 8.0 c C 420 7.5 a 0 v ✓ 320 7.0 ;; pH=6.5 w 220 V'", "61,,r - - 6.5 w 6�1� °..1YIIU". 1pI1P' NI6i1 -6�14b,.,.,p1p61 „614.,'�iVOnh�tiN "�>U6fs. �1dINM1UIVIIry".=6N061°.d1�61g 120 ............... ............ ............ ............._............................. ,........... 6.0 2002 2004 2006 2008 2010 2012 2014 2016 2018 Year Nu6,o..»EC -�-pH Western Canal (East) 720 ............................................................................................................................................................................................................................................................................ 9.0 EC=700 , ---------- in 620 - ---------------------------- �------------------------------ 8.5 = pH=8.5' •`-'• 520 6111U,. 8.0 NINE iIIVVII Nup ,ti4 , 4� ,� MIId6 716 10111111"41111.... 119WIIVII 0• 420 U6Vlh ca A 320 ipVUi� ..... 7.0 ,1� 17.1 220 - - - •- pH=6.5. 6.5 120 , ,- , , , , ,- 6.0 2002 2004 2006 2008 2010 2012 2014 2016 2018 Year 411 EC -4-pH Western Canal (West) 720 ......... ......... ......... ......... ......... ......... 9.0 v 620 u�� m�`" 6 �._� UIP VV 8.5 61I H=8.5 520 11Illllp.. i 8.0 G y.... � n 91 P 661111 v 60 , c420 �,l� .....d, 7.5 o a V u 11111111'111 7.0 _,_,_,_,_,_,_,_____ _,_.._,_,_ r. v 220 - - 6.5 w pH=6.5 120 .,. ,. ,. ti,. ,..... 6.0 2002 2004 2006 2008 2010 2012 2014 2016 2018 **NM in 2017 or 2018 Year flw6,,•EC -�-pH NOTE: The red dashed line indicates the preferred maximum level for EC and the black dashed lines bound the acceptable pH range, 6.5-8.5. Therefore, when the red plot of EC values is below the red dashed line(as it always is),then measured EC is within the secondary standard for agricultural water(<700 pS/cm),which is more restrictive than for drinking water(< 900 pS/cm). To be within the acceptable pH range, the solid black line should be within the black dashed lines. 11 Thermalito(Domestic) 720 EC=700 pH=8.5 y 520 • .,... 8.0 .0 420 ...... 7.5 WI} illi r ^TM' , , 320 U 0I1, 01 7.0 u pH=6.5 220 6.5 w 120 6.0 2008 2010 2012 2014 2016 2018 Year 71,--,EC —4—pH NOTE: The red dashed line indicates the preferred maximum level for EC and the black dashed lines bound the acceptable pH range, 6.5-8.5. Therefore, when the red plot of EC values is below the red dashed line(as it always is),then measured EC is within the secondary standard for agricultural water(<700 pS/cm),which is more restrictive than for drinking water(< 900 pS/cm). 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Z Z O 0)0)r r r O O O Z Z Z r.N{! 0).N r N 0f r '"l .N 0)Z O O O O ZOOM E w r r r r r r - - E w I§ c ani w man E o t 8 O W- O N M r g r O N M w N V w N M w O O r O O O r":' .......... d'C'4 .",Q1' V LLO w N 0) w r N r W P-E O-S C`� IF fD! 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Z Z Z Z(Z�Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z M w w M M M M M M M M M 0 0 0 0 0 0 0 0 `T M N N 4 N N N N N O O O N N N N N N N N N N N N O O N 111 1111hi C _� (j c Da 8.k L r, w I- Q U p 4 .oc A33210 rn m 311f181SV3 3110ONVAM 311l81S3M mt N 3 ,_v m)-m m m v)-h)-rn rn,-u rn.-N m.m h v h)-h rn N h N O N m v m e g O O O N.M M M r r M m V h LL,m m N m m N m p N N O)..M m r m c0 M c a`-' LL�(O m N M N V M LL�O M N N N M V V M a o. .8 0 22 o aax m N y -mom O h N m.m N m V h N 0)-.m M N m O.m h N m .-N mm m m o O M p M h V V O V(O o V 7 N N'?“?'?M°V o M“? N 2E, N N UN gigx o"" a Q o p1 M' O m O)m p O (O LL�m h V om m cd�o V 9)7r roo 7 oiOi-ui 1 '64 > `o C d d w-+Q O C Co m d N N W O uU m m N N O)r 0)m m M 0 PVT/ r Or;*,*Q000m oMmcd)-ONMVm-'W.mrNMm r r.-r EEEE..EEEE,,,EEE..E Cil! .lJ O C x m a d N O)fD O) CO c0 O)O M m;M m C r w M a w h N M Y Y V h 0 0 f N m.co m r m co E E E E' E EE E E E E E c c ,c20,9 m )-V M V M V 10 M W M M M r r r r r r r r r w S v J N O .� N 55.9 111 LL M m 0 t0 W.00 h M c0 0 0 M V N O)IS)h 0 r w N r m M W O)(O O)m; L `� m' ...OO 6 (v.pp MO rLO V V rM NOO)t0 mrc0 hO) E ) >$ d , co Oo) , M A V m.V-`V N N s V-s V-s m-s M-r A N . w w w w v co d O W u mm 1()u,N m.-m N V .V M N,.N h 0 V r N.m O r M O m m, O n m m N N , M V`2`d h N O M h m m. 0 M N pp NIG M V M O w h O m r 0 0 r w h r S V N a 3 >3 O O Z Z O N N N M`V M m V V m'.-N N M V-s..-s V-V V-r O E,'-72 a w w w w 0 Z c LL o O O W LL M P)(O o(O O)h m N co V 0 CO m:M 0 l0 O)t0 f9 M v r m ISJ m m m N m 201 N O O co m 0)-N N)-)-)-O 0) co V m0'!0'l M.V-N l0 N N a w w w w co o O O o m N , cc O W u ..m LU M O O O)O) h N Co JO W V M O M O M O r M c0 r 0 O c0 i0 c m`A 2 N N N , V M M m m O O O)N.,-M V r M M.� m m h r. O O n N O c ) d 3 0 0`m O Or 7 0 0 7 N V M m-`V N N N V-, s m-m m-sm- Y N N N N > v co 1+1 o ,. 3 m T120 N t c O W LL cor'm m h.-u�V m L? m M 10 W N r O m r r W N W O)N O N 3 CO m '-p,0'883.- Doc,M r co V V M O)O) 2 <p V M"' M ifJ O O h 0 0 c0 h(O p m N CO S N Z Z V M,M.. N N N.V- .m-r r r r r S - N N N - -o a me,---m �n `O c w °= v m m 2 N O E A L'-',71.0,5}E c w n ° o t v 0 W M N r m.10 m-O)N u�h Q V N N)0 O O�";M N 0 0 0)m O N t0 M O)N W W O p CO y c 0 ETS ELV1 MN V,O m.V V V V.. w OO M0 Nh,M co00 w1+M O Nw h t0 N= O)u7N WI.' �u OO=❑ c 3 d W O O w O) N )'2,-,-,,, M.,- --,.�O s0 s rV,N W V'V et m'{V M{ (n a N N -; ca COw3 mr- E - E2=.2 75 Q O O O rn oi ON � 0oh O ccCWu VO)mOmNmhmO0 +mW00OMhMAmOV0wh0OOO) UW 1 CON m3Nm tV OOOuu0CNNVNrwONhtAp rVVVtOV Om O E NVM c V N C. 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C unty ato.r an lOoto.s urco. C nso.rvato too)) } 11 Groundwater Elevation Contour V k ,a^ (Linesof equal hydraulic head) „ i, � ,W�"fY Int I rp nteryrva120ft B�TERE'1 II 1 + Groundwater Flow Direction !.. 1� Monitoring Well 11 JV � 1 1 Subbasin Boundaries I •w,. I i I I 2, �1 L'• 1 ",,.,":,,,,, Redding/Sacramento N)E&s Y�' fir,« ) �I �; 1 V �' ^"" � u GW Basin Divide 1 I I, FI County Boundaries ,„ xY;�'y Bulletin 118 GW "' °' P4' - Subbasin Excluded Areas n SOU V-E BATTLE CREEK RIm ry IROSEWVQ7C7p, 6 0 6 12 9310WMA 93EGVp l 1 r Miles .,«,« / IRED BLU F NCS I 1„d I I DYE MEEK 1 a TF M 1L I � II o'' , JI' +1 Cornet I-a • « a I T , L „«� ::�,,:„ „^ «.,,«,�^ W y ^. SCh I �. dlw» ' GLENN • : ,n�y 40!,v^ 1 d„d,1@AAl(_Y 1 , .� !1�V ".: M ,d PWM`kw„' ,w," VI i .« ... � „„ \ L + PoEVJTT�. III• 1i �1«w� •• I �. wvE� „ d _ .. '.. .. �,.. .y„ ''I I 1 1 I... EAST�iV,YTTE�N,r') 1, 11 a ,L.n al WVYA�DC3TPECrREEVC 1 „„« IIM ,S1 dil I.w ",. Yy , r ,« ,,$i .« &dkR&.d'4M'Y1 i1: ,1�GO L.Il1 A t.R, NORTH YUBA ' , ,,1 6, V I � _... ,. IIS". � .b�1 I Iy. ) '�olusa T � j,.....;;„ ) ...... � NOTES ' I .' � 1 i„ x.97" pV -• I Clts ( ',1 ,1• l If- I ! Note 1'. The groundwater level measurements that were used in generating ( and Local pebetween°the dates of March 5 h to A )�I ,`! hth 2018rsw Resources w.« + `1 tl ”L !P '''''''''''», J I y 111r, Department Cooperatorslit ' Pr � Y SOUTH Y ESA h 2018. Note 2'. Groundwater elevations are based on national geodetic vertical datum • \ I W c 1988(NGVD 88) b ( � I 1 1 / 1 '' I I ~ti I Note 3'. Groundwater contours are based on and --- ' taken from wells constructed that havescreened intervals and well , portion aquifersupplies more than70%of all domestic, �' ''40 I , 'rill, ,� agriculture, that are geaogaleas groundwater levelthan 450 ft Thishts ao « ^ N / Il \I II,IN depthsaltuhe and municipalwells than 100 ftines 450 ft. ®' 1_� ,d• IV q 1 _ AV 1• Note 4'. Groundwater elevations are based on the actual measured level of the metr c l) ,,.,;�', ,w. - 1 :4 p, • �x ) ” /f/ ) y '�v• ( 11 II - �� J { hydrostatic level(pezometrc surface)of the water atindividual ' 1 surface between wells The accuracy of the estimated contour is directly '''''. ;:(.ke to ofeeebynmg and the the disrbutiot of nea by oniorin halls,th ,'i\ !i 1 " II �' �Ii � • III- 1 local ons.Contours are dwater elevat on est mates of the simil y ll on, an the al s or simiiarities in aquifer characteristics. "�1 ) ry ' �'/ 1 E YIQRuar 1f '�C"ijlhB� , , , wrl,. \NN,'„r.tY� )n �Y >ycv, '1.4. a ',� ^`1 I r I / If'!„f II.f. !, — STATEOFCALIFORNIA NORTHERN SACRAMENTO VALLEY w A THE RESOURCES AGENCY GROUNDWATER ELEVATION MAP ~ W") PLATE 1 �f k DEPARTMENT OF WATER RESOURCES rl NORTHERN REGION OFFICE 2440 Mein Street Spring 2018 °� kJuly 2018 , , Red Bluff California 96080 100 to 450 ft Well Depths (530)529-7300 (Well depths greater than 100 ft and less than 450 ft deep bgs) BY. G.Gordon,PG 7811 6 http://www.water.ca.gov/groundwater/data_and_monitoring/northern_region/GroundwaterLevel/gw_level_monitoring.cfm r t 1 Redding r ( r • Monitoring Well y'U , �I Redding Basin a� TRPRVSE 0? 5p: Ar r Subbasin Boundaries V / ..6VUPISubbasin Name GWEMaxmum GWEMaximum GWEAverage Count ,,,,F i Redding/Sacramento it Increase(ft) Decrease(e) Change(e) GW Basin Divide I Anderson NA s 3 a 3 County Boundaries'I f ��g Bowman o 1 as -2.2 6 cy a Bulletin 118 GW "' _ Enterprise NA -5.5 -36 3 ^v A Subbasin Excluded Areas ANDERSON MilIville 0.9 -5a 6 0 6 12 , 6V18LLV LLE �' Rosewood 2.1 -5.6 -1.9 2 I I I I I I I _ �? South Battle Creek NA NA N8 28 Mlles 1 SOUTH Summary 21 as 2 �^""� „ �d�"� h � r BAV"TLE � / _ ) +wwk�• 4 w r, r v NOTES '""" „/BOWMAN r Dsrarn�2,mtie:a7ares are�';a:'gaZ n9ner"he � ,o ow v �N ,o N a hha earmaa he preaoae vea,.a aeeara h a bar - ° �„ ,� l ' , / a reiawer�he cart v h h Preaoasvear. r I h a n aamherorN,eusm a h n cANTELOPE I � �" N 3 lnsm P v ��heea�ar,��geash h� h same "�^"/•'"`a a, ,,, usm vaor tieasme oa vap aaemheei p ry Haber „ vir v, °w r+ry •' t e 9p °4 N 4. G untlwater level changes are basetl on rtie k from wells � r ���� 1 � � rib tlephs of100h 450 ft.Measuremen6a aken tlurngsmlar[me ,,n.' • ,,Red CREEyg pe,oaseaehvea, - Groundwater Elevation Change _ V • r �<Bluff N e 0%1 e a 2 h ao�heaewaimeas ai is os r r 0he hva i(P e rt )sh sr ma r a u d ,a >40 feet higher iearo a pi ah / ,ai, ntl sh Itl b tl tl PP asu y f h tl J" rv1 E� 1 "'" r sareei iretlmhetm sh m aha h ,I !raiuv� Y 9 P 9 E L. II ss oraeamv moemr�g weus weu eoanc,eroa, aageserehaaerersres >35 to 40 feet higher i •'\, C<JLBUePP ' Harecti2622,V.2 c a e eaa .s ' >30 to 35 feet higher 11pf444 , � y � a,ti 111111 >25to30feet higher mMNO , IIIIIIIIIIIIIIII > g 1, 20 to 25 feet higher I in ,gam^• - ��, II orning � ,' >15 to 20 feet higher '""'w 1 (. ,I oa, s_ u,a, ,a 's� Ir !,� ...1 >10 to 15 feet higher ' / 'I .pp >5 to 10 feet higher � C$RNNG )' 244 nr tl 1 0 to 5 feet higher , 1[1 1 >0 to 5 feet lower . ..„.„,,,, ,... -..,4-8. ,!.. ''t' 1,.., -1''''''''''''"i"' , 1I-°^1"4'i' . N)1 >5 to 10 feet lower ,,,m/'' r 1 jorla d Y 15 s f�� >10 to 15 feet lower -1 ',,r, 2 '' ; a \ �' ' A II J�j����� -i s',. k T55.11 , e e" /,tel21 1.1 t. I)Q7 BUTTE /' >15 to 20 feet lower 4 B 6'UBd6U; „w ��VVVVVVVVVVVVVV >20 to 25 feet lower ,,,aw i G � , r ,,,e IMIDIMIll >25 to 30 feet lower --)t)- ,'- '46111212 2 p x2 <, ' II „////� >30 to 35 feet lower °--� 1.84 5 o� . .s�M- zs �� >35 to 40 feet lower��� � 1� 22 MI >40 feet lower -0WllowESTTL •22 r'''''''' 6 is • , rBJTTE 1 , 1 i ' ' '8:,.48 1/ .8 8 16 02.6 ' .161 12 ' . ''6' EAST 1 \/ , /..-A17).‘,,2 ,,,,,, 1 A oa UtUTTI f 23 • 6 6 m C/3LtUSA4 V'60C �7C2TTE � REEK 42J 22 ,� [ 1.% <�� 212 6100 r 4'61 3 �Wye Oak ��C21f811i VAI I , VUJBA Northern Sacramento Basin .v jNCRCDQ, „1 Subbasin Name GWEMaxmum GWEMaxmum GWEAverage C a { sµ Increase(ft) Decrease(ft) Change(C) i ,,,,fl,,Sa y,�y 1 1 f1 i""CXf.8A ,4 I / Antelope NA -1a.o d CX P.JI4P P' Williarr�ts `l, tw,f T1'@Gaw „� w Bend NA -9 2 � G I Colusa 8.5 -22.4 Sr.3 87 r � ) 1rx I Jr- Corning 1.a vo I ,� a Creek NA -0.3 32 •s\ �„w- l •s.z a/,a, • J ,� / & e / SCLIBAd s XUJBA 7a •- - --._.. , East Butte 2.3 a.9 oa 19 r I r � 1121, � � � SUTTERStUTTIE•R„w Los Molinos NA -s.a s.2 3 f � 4 Red Bluff 0.0 -11.6 -4.3 1s ,,,w es '1a• - I - /) 1 Sutter 2.0 -13.0 4.9 16 : s // z888 Vitra NA 11.3 -54 29 f,,.�.�..v'*^I I / y. ,.� h � u q f � ';,y West Butte NA -9 6 '-,,I,,,,,- n� II� ,,, 1��r, ysv� ,, it Wyandotte Creek 12.1 -4.9 r i i "+w2 / Summary 121 224 � NORTH (Sf � a 'rr , „ MER CAfl� 'a Wr r u�� \ � ,. iv �/I 10 IB ��17 STATE OF CALIFORNIA NORTHERN SACRAMENTO VALLEY THE RESOURCES AGENCY PLATE 1C-A .4P,''''''',,,,,'1'4 DEPARTMENT OF WATER RESOURCES CHANGE IN GROUNDWATER ELEVATION MAP NORTHERN REGION OFFICE SPRING 2017 TO SPRING 2018 Date ` s G.Gordon,PG 7811 2440 Main street September 2018 Red am California 96080 100 to 450 ft WELL DEPTHS av (530)529-73000(Well depths greater than 100 ft and less than 450 ft deep b g l _ http: vww.water.ca.gov groundwater data and monitoring northern region GroundwaterLevel gw_level_monitonng.cfm rT g • Monitoring Well .• v f� 1 .........� u,sre :',A\'N' R'RVS 5tt.�,zh76,,,w Redding Basin Subbasin Boundariesf LN1 PSV Subbasin Name GWEMaxmum GWEMaxmum GWEAverage count ,,,,.1,2„,,f,.,,,,,,,,,....1,:/,,, • Increase(ft) Decrease(ft) Chan ft "°" i,'—"" Redding/Sacramento It ',I .\,,,,,,,,,,,I,,,,,,,,,,,,,,, geld `�„ V GW Basin DivideAnderson 0z 7.5 -2.5 10 County Boundaries NA o z o s za - aW" Bulletin 118 GW �.� Enterprise NA sa a7 3 NA -6.9 Subbasin Excluded Areas ABYDERa4aN, Millville sa 2 � 6 12 V MILIL.IVOLLLE v�- Rosewood NA �.t -sa 2 0 6 I I I I I I I Miles South Battle Creek NA NA NA 0 � Summary 02 102 -4.6 22 I CREL f pre m rore m° u„ '"1M, S" ,R.v",grlC7'ta�,iEW47fi3vt�'D1 r, �( � ,€t,$ AB'VL,'✓E , ..' /N z asigsnn taassawre aretiasmawa aora�mma a aNOTES arnO,RtigaeTarrEovsaSvy are re»MR� "1') �� N r. nn o mameaadaaa9tarue aanberrwan4 rad,mulasreaarreran that aof"tt'groundwater r.swnaarey r BOWMA7 Vii ,BEND ,o v, o,� wn ore ».� aomraaeessn m n .sow ��s gluf � �NTEILC76'L v ti tii reap,,amen,ai p ry Hamar. '''w +ry f R E vr,vi ,r,r N 4'. G tl h g=are basetl on me k f IIs nir vi „rvv, Mf �� DF M1tl pens of 100to 450ft Measuremen6a taken tlurngsml Groundwater Elevation Change N ' th ag 9 a e a oe mead /' a l(p a )rn 9 a a s ,er ie ton G tl p.g. p tlf M1 >40feet hi her i VVV asn mti a app m v sn a a g ,,,,w ' � � ,�,^ ��„- ostla,ev onm � IIs 9ur� ucton as °ercM1aratlersresbt 1 fixl// ' I 1 uv4J I Y rn9 we qu esrrvv ri, b / �a �os w 9 d >35 to 40 feet higher / swE-o a e�a o� >30 to 35 feet higher B :N.461dW�tl i r 4 C6.NG�.PP 1° f I / F i , k 1 I vi�������illi >25 to 30 feet higher r ,n, r i 27/,,‘ 7/f57,7,4?ni� ,„ Mf.7�lh'B�@_.A 3 ,o„E ,�,,.�, ._ ,,. /,'. 111111111111111 >20 to 25 feet higher f l�” „E >15 to 20 feet higher 1 / .4 �� >10 to 15 feet higher , >5 to 10 feet higher c,CORNING, / i,l C %�t l ss t VONA 1 0fo5feefhigher - �, ) - >5 to 10 feet lower if',' t, q ��,rld �� _ I.,,N, „aw 't .113 1 � I�t a �, .�II'iii 4 >10to15feetlower " e/) 'TT. � • (/ �. ...:: ,r �WIZ ) �vf � � � ico B@Af9�' I I �������� >15 to 20 feet lower CGYCN¢4d 11� 1 s•./'v ' s. ' G.'d:.Ct.1t1Pfl W" / „ >20 to 25 feet lower ^�� Itt � 76' �' 1111111111.11111 >25 to 30 feet lower r�r \L..,,,,,07/ .• Je iv w r�r, i 1 33 u„�„////� >30 to 35 feet lower „w �,a lI � >35 to 40 feet lower ���/ �` z< �� f am >40 feet lower WAST/ � � ���lows za x s � � i .�,1 •BUJ&TEa � 1, 1' 1 .� ,,,re „aw ,,,� w r o<B�UTTE,. 11!(•., C13 tUSA CRtk�IK 333 335 353 35155 „„o,v �„�, �,,,.Iji, ,�, „,are '1'111.1' ,� f — — ""wa I— .�z; rP� '' Live Oak .Dr843R/Yi I9 Northern Sacramento BasinNCRO tit i ,ti� GroundwaferSubbasins re F ' ,� �� a�re�— i �„aw�Mv � a, I •QNCSF',Q�7f 0 Subbasin Name GWEMaxmum GWEMaxmum GWEAverage Count �..'111\.'(• Yo, gia,1p% n�u �' q Increase(ft) Decrease(ft) Change(f£) ,t"1PI l�,+A ,� qq ✓ { f / f 1` ,✓ J / F Antelope NA 5.7 (fY,@p�d"� ” / Willi&rtis �E� i fit) �y� Ya 'r 1 v, Bend NA NA NA 0 / Y Y*N W' Gty ,i is f1 , % Colusa 5.7 -46.9 <:k II tH ° [r 1 1 �'IS8.U1"TIE"ti � r SG6'J'VG9' 11 EErt zas a 1 30 NA oz ,m �as -29 20 I o-- �/1 (• t/ )li .i , 1) - Iv. Los Molinos NA -4.7 -4.3 3 Ir' I �)�11 ���1 ' / ` Red Bluff NA -19.2 -7.7 12 tt, '''' (/ .11""•1111111,�f '- 4 - , 11” ff, Sutter 4.7 -6.5 -2.9 7 ... .µi .ro.. �1 Y Y 1 ���� +:w d It �,il c. I� / t ��,,,,1 Y ' Vina NA -11.9 -59 2a t>ti 4 West Butte NA -14.1 r / t'to rd v 1 Y ll / •'Et Wyandotte Creek 12.1 -10.3 I uM* ) /,ff( i 'w S % I l !E f f-0.3 a _ e j t 4 'II ,4 NORTH CI Summary 121 469 l ' ". r'` l. ias I!1E1°3. MERhCA o,agt11 STATE OF CALIFORNIA NORTHERN SACRAMENTO VALLEY THE RESOURCES AGENCY PLATE 1C—D ��r DEPARTMENT OF WATER RESOURCES CHANGE IN GROUNDWATER ELEVATION MAP NORTHERN REGION OFFICE '''''''.11:, 1'''r-,,.:''';":(''''''" ,,,;:'''j ' SPRING 2011 TO SPRING 2018 ` z44oManstreet DateAugust 2018 - Red Bluff,California 96080 100 to 450 ft WELL DEPTHS t (530)529 7300 (Well depths greater than 100 ft and less than 450 ft deep bgs) BY G.Gordon,PG 7811 - httpl/www.water.ca.gov/groundwater/data_and_monitoring/northern_region/GroundwaterLevel gw_level_monitonng.cfm r N 1 Redding ''l"., r „r rF • Monitoring Well ry'U gyp: UA Redding Basin TE R6'RVSE r rr Subbasin Boundaries ,' % ..6,Yfl.U4PP1� GWEMaxmum GWEMaxmum GWEAvera Count I I � � � 6� �-� c Subbasin Name Average Redding/Sacramento it Increase(ft) Decrease(ft) Change(ft) GW Basin Divide « Anderson 3.0 -3.6 -0.4 11 County Boundaries Bowman NA -1.3 -07 4 zz , "•? Bulletin 118 GW "'y; , = Enterprise zz os os 3 ^v4Subbasin Excluded Areas A3NEI,RSON 22,4 \55.5... " 1 Mill i'u e NA -as rr„vr ' �� VVCLlOL�E6 0 6 12 l ' � �' I w Rosewood NA s.1 s.1 1 1 I 1 I 1 I 1 1 36 ® Miles j) / a South Battle Creek NA NA NA 0 �� SQ3JTH Summary 30 51 14 23 ma: t� h CREED( r� IRP,DSEW00nf � 1 �ri P t ri �� cumNOTES L� 3 WMAN �l1 BEND ,rr,vr ,r,E Nore r. aupros��ve�nrumermneapcarereav�greuatlnwgavele�abonswaerehghmrnme � , p"p4 � ,rrrutlwalerelevaronscrerelowern me con b b - � ., e n v preaoosvrdr I _ N 2 S csare basetl on me numberofrvellsm tl tl, b 4 a� /AINTI E!LC76'Ib N a m ap may no,use au me comranges sh m b .some a� may no,be acme on map tluem me cl p ry homer ,rr rw [ mgr- '—' err vvr yr 4� N 4'. Grountlwaterlevel changes are basetl on me k fromrvells � � �� rim tlepms o100m 450 ft.Measuremn6a aken tlurngsmlar[me , vir yr Groundwater Elevation Change _ - - Nore. chane e tl b tlonmeacwa:r asuretlle�elsof s Bluff ��a Bluff ' rr me tl p rt sh tl d aII© S hvto G tlI( p 7 p l tlgf h >40 feet higher ,rr, stl pp m v aretlheymb I tl tl h 9fh f 9 tlh tl a an l E � i r ur >35 to 40 feet higher 1 fl ) ' l r , I` 2 e o N s cgfw srzcrbcy d ert IIcae onilililililililililill >30 to 35 feet higher A1Bf16�4 t I35 ,, <<t4 �, ,� iMil Nos1111111111 >25 to 30 feet higher °rrw r r 1 ” II onslruct on tlaqu ferchaacters[cs 11111111111 >20 to 25 feet higher _ - 2t- 1 �. d 1" I -: .... >15 to 20 feet higher r "" w i 11 , «r e /J >10 to 15 feet higher — 335 wry ,.„e ^^ >5to10feethigherC$RNNG,�� �� m, `t, 0 to 5 feet higher ......... ... ��... �... . ' � i ” -I /two� ��•+Jr .5))55.. . 1 r'/u,r, , lir „ i ..., 5''.5223.33)5.11313..) � 2mr rr_ � >5 to 10 feet lower , „ _".. ,,.,orj �;k >10 to 15 feet lower - � � ,I � LP Ij��), >15 to 20 feet lower 4 U EN: - ,r .,--tr (CY m ,S d.7&Nt--"" ,rrw d'UUN!M" /� Z.,;/ „rr „w 1VVVVVVVVVVVVVV >20 to 25 feet lower „r rvr .... r,w %,raw ./,`// oa �.r .._ . �,a I�`� 7 r, IDIDIDIDIDIDIDIDIDIDIDIDIDOI >25 to 30 feet lower _ ( y � //�� >30 to 35 feet lower %� \It -" ; _ oI ,s�� 3 ,r,m „a ,,,m ,rw w - >35 to 40 feet lower n, I� <1 ,„w , _' 1 1 y ..."V>40feetlower : itlEST• \\ � 1 ,r 1 11 ip" 5'3i „r 1-; tTTk 0, rrw „m UG • t BUTTE r,a C/3l - \Gri3530 r<_ �A �dley, W 7CTTE�, \ CEEKS rrr / 0 r, "r [ — , r ' /_,r :' , ,/ 3/tr I'.. 4,ILivesk', ".NOR/YiIlei ;% ' / l\,F YUUBA Northern Sacramento Basin / p NCRfDi Subbasin NameCount GWcreEaMse(xemum GeWcrEeaMsaex(m)um GhWaEngAverage ll r - LColusIa t r r x r � } ���. ' " .e i Antelope NA a.z1413/ C"CXP„lt4PP' Williarr�ts \ tw,f7r".1'@ y 1 W! ., „r, Bend NA NA NA o rw„3„.......m.............7,,, i ,rl .•,/ lri n AVe.F YIf a ''''-'-','")iny Colusa 1a.o 24 1 -3-0..11 63 2 3 � G,T SpJA' • ( � i SUTTER ) � lCorinne 2 -1os as 38 r os1 1 n. ,r �, , / I e, „,,,, �,r ,,,,,,,,,,,,,,,,,,,,,,,,,,,Na,,,,,,, 'nDye Creek NA -0.1 e �rr East Butte 1.0 -9 7 -2.3 17 i o r) 1 II (' ) SII d1d1d(!p, -111. Los Molinos NA -2.a -2.a 1 r Y 1 ). 11 • o ry I ( �X ' I,m r ;,>y Red Bluff 0.6 -19.1 -a 11 4'''‘ Vd 'N Sutter NA 12.2 -6.4 2 n,vs `1i1 ,02 4 1 West Butte 5.6 13 7 2 2 26 „w,.r.ira �e Wyandotte Creek NA 1s -14 3 �� ,'„J';''",',''',,,\‘',, ?F �/r )n 1/ o r, �Summary 14 o wN 24 1111 „,f, 1v a�v,p ff a �'(" f� l , P1�p P h Ar�!rrm (I B�VIr OERRVTCIWA' �1 ) ( 0r1.• r � �p „rt �si,, STATE OF CALIFORNIA NORTHERN SACRAMENTO VALLEY THE RESOURCES AGENCY PLATE 1C-B .e,%'-',,,,,, V 5 DEPARTMENT OF WATER RESOURCES CHANGE IN GROUNDWATER ELEVATION MAP NORTHERN REGION OFFICE SUMMER 2017 TO SUMMER 2018 Date s 2"r 2440 Main Street September 2018 ,,,,,\,'11111‘,"':/S' 1 ro- zea Bluff,California 96080 100 to 450 ft WELL DEPTHS BY G.Gordon,PG 7811 _ (530)529-7300 (Well depths greater than 100 ft and less than 450 ft deep b g l http liwww.water.ca.gov/groundwater/data_and_monitoring/n orth em_region/Groun dwate rLeveUgw_level_monitonng.cfm edding Redding Basin • Monitoring Well max,n,un, ,w,„erage count ,A\N rekPk IS d ,,j" '':.OriiiT...."? Subbasin Name 2:a's4:';Tun' IT,V.Vcrease(ft) Change(ft) I.............."1 Subbasin Boundaries • -1 4 11 6'''/ft-0(''st')3s)iL' Ms , slfsjsstt'ttss' Anderson 1 6 -60 Redding/Sacramento /I 1 '1 4 , ,,,,,,,,,, ,,,,,,,,,,„„,,, Bowman -07 4 L .....i GW Basin Divide 1 ,,. ,,•. \y',/'• 4 r -''' ,,• . 0 9 -2 1 1 County Boundaries se NA -145 -62 3 Bulletin 118 GW NA 6 0 6 MilivilleNA NA Subbasin Excluded Areas ANDE ,'ON v4 ', ...6' ''MILILitVLZLE '''''''' Rosewood NA -45 -28 2- South Battle Creek NA NA NA 0 I I lI I I Miles , / ),4'' 4 ' summary , 6 1 6 -145 -28 20 ROSEWOOD / BOWMAN BEND,/ NOTES Net. A"s'`'""m"'''''''"`es'""'n'”dae;eeetvhaa',''gr,":,w,ed",,e,ter "°— Zab'sat's7,— '''''''' ANTELOPE N''" 'w'eL7fy'rla0VI Il7tV'SSL:110tnhte,',DIC'drure'Ill'IlSeS'C'IC'O''S'e,r0X,-r,Vt t.eea'ho.thwerlls , N 4 Gr.,.Water leV Iclgoe;ajeeruSree','„'er,',t's'ea:Utralere'nenc,17,-,,Ig's?nlrlIaTIIMee fl Groundwater Elevation Change '' .11111111111 >40 feet higher E >35 to 40 feet higher BLUFF ,, ,ji,,,1 / 1, No,e6 ab rG c,.ju,civnu:,,,atej,trcr jsLIrrav,:on l 'gL AN w • >30 to 35 feet higheril...,.„1:•L,Tifi",. ,/,., ) z 2,,,( A , ,,.., ,„,\"0 1 ' Villipilli LOS >25 to 30 feet higher ''"' ''''' 2 '' , T F:,,, 7'4 l'il:i..111°'s.,, 4-, 111111111111111 >20 to 25 feet higher >15 to2O feet higher .....,,, >10 to 15 feet higher 'j jj i .-1 \t( ' r , ,,,) coRNING ,,1 ,1 ,, ,. ..4, VINA 1 1 >5 to 10 feet higher 'j 1\', \t\ ‘. "- '''''''' 'l'j "''''' '',1,/,11111,11111,11,1A1410t Ot / 0 to 5 feet higher '''''' 1AMIII 11 if, , ,,,)%, , f ,',1111111'a,t1•K fitr""/ '''' ,,, -,.,1 ,,':., lc ' 1 >5 to 10 feet lower . ..r.22w. , , le,..„, FI, ,0111.,1::: t\idl\‘,,,,, (:z,,.,.., >10 to 15 feet lower ' Ijiji A >,15 to 20 feet lower 1 :(".iV.6.,.....7.',.: ,..,.1.„,,,. 2,,,,,,,t/1','111'1!'''':''''''Iii j'(('IlY'L''''i'j'''''''re')!2'.,,,,,,,'/4\,P i,.,.,/j,,,,, 45w1)3211/.?,'\,,\)4.,,C,,,\,1,;•,0:s.,, ,.,: 1VVVVVVVVVVVVVV >20 to 25 feet lower , I. „t t,,,,,,,rb),, _ J m , -,-..: —,-. 1111111.1111 >>30 to 35 feet lower25 to 30 feet lower ,,, ,,e, „,,„ (,,. ,, !UN ' >35 to 40 feet lower >40 feet lower ,if 4/,.4/Willows • WEST .03 .. . BUTTE BUTTE WANbOTTE d /CklEEK / '' • 1 ,„..., ,,. , • 1 ,,N,,„ --,,,,__, Gridley .3 Y '• )'',.1 ''Live NORTØ YUBA,' :,'i;".''.‘• Northern Sacramento Basin Groundwater Subbasins r clo)iu4'"'..-1','n '.)i,' Z-"•:.:,."..,,..-;;,':,,-;.-^:°::,',,':.'.''''.;'1,,.r:2-i: ,,' i;1., j,'2:i.:,'A',,,,,'' ',i, I 1%,2;V'/,'','''1-'6::r',i''''''/:,,,,;',,' '' Increase(ft) Decrease(ft) Change(ft) Antelope ''',,1 fit' NA -9 6 7 5 3 j/ ' '' )ill'.:11' ' .' ''S,''11 ',,'.'''''''';;TP, SOUTH NA 0 NA NA .-.,— i, .. ,. ,,,,, ,1,A., . i I) 1A Bend SUTTER TTER (j ,. JJ', ,„/',,'''''/Y,L)B.7-,/,, City 22 4 -291 -149 26 ' '' t ' /r 'il\\''i'W,4 t:'z: ‘--,-, . .. lil 1 I t1:7'', 'c,.5, (NCR9) Colusa -472 -109 64 l, ei,cg. 4 ,; ...'(2 ,, ''''''J' • NA Corning Dye Creek 0 3 NA 0 3 1 '' '''' ) ,\ 11 -208 17 , „'' \// '' t'''ff)J'641)13 )1/41 tt'1 4 East Butte -5 3 't 1 lf(t).-t Ilis's':'''f,'11:110) ltf,,,i 4 i\t,_„ `Its(t'''' (:1,;'''' .13's' ill''1'1')Is,isss 'Ci3sss ) 'ts Los Molinos NA -6 9 -6 9 1 i' '‘, 11,1.0110‘,/' \ 1 1 ), ', • ,,,,1 1/ ,/ ,,,•,,,,,„,,'..11 r ',,,',.,,,,,,,- ,.,, • -18 6 11 t)s's)') i '' "' 111'111111\1111°IllsA6(s. ffs ‘ ,,,,,,l- f l -"\' ' ',,,„ Jfi',2%. Red Bluff 4 9 -44 6 NA -13 0 N,sssi\i t et K Is s sui',1,t, j s Sutter NA -242 -92 23 1 sis ''''t ' / '10 Vina West Butte 35 -180 -40 14 t;ls, '''' Wyandotte Creek 0 7 l ' s\ ./// ' -9 0 'Et Summary 224 -472 -66 171 ' \ )')P1t( '''''s ' r ' NORTH MERCAN PLATE 2C-D ' ' NORTHERN OI JSNADCWRAATMEER- STATE OF CALIFORNIANETOLEVALLEY N MAP THE RESOURCES AGENCY Date September 2018 DEPARTMENT OF WATER RESOURCES CHANGE IN GR NORTHERN REGION OFFICE BY G.Gordon,PG 7811 http www water ea govi 2440 Main Street SU M M1 0E0Rto2405101 ft TWOE Si_LU DME MF,TEHRS 2 0 1 b 8 s) Red Bluff California 96080 (530)529-7300 groundwater d data and monitoring northern JednaniGrann(dWwaetlel rdLeapvtahnsdwgr_eleavfeelin,fhaannda1n0n0d fteft,and less than 450 ft deep g // _ Co 73H +0 r m w io 0 2 .. ` gill 'N.,,,,, ,P ;'„,''''' '''‘ „ A ill...c c) r To �I 1 � y� , , ,,. ,„,.„, 1 ,,e7/ o4)zi) j ) 11111111111111 �, %.w , " P, I-/ 1 4,0 4 i/ 4, r s i 0 T nC . 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