B. Description of Proposed Boundary Modification

1. Short Description

   Santa Paula (4-04)/Fillmore (4-05) subbasins boundary (Jurisdiction Internal), Fillmore Basin/Piru subbasins (4-06) boundary (Scientific Internal), and north/south Fillmore and Piru subbasins boundary (Scientific External).
2. Type of basin boundary revision

   • Scientific External
   • Scientific Internal
   • Jurisdiction Internal
3. Provide a narrative overview of the boundary modification request and how the resulting modification would affect likelihood of sustainable management.

   The proposed boundary modification will further sustainable management of the Fillmore (4-05) and Piru (4-06) subbasins by more precisely defining the boundaries using the best available science and data. Dibblee Geologic Map 7.5-minute Quadrangles, VC, CA, 1990s (1:24,000) and Channel Island Regional GIS Collaborative (CIRGIS) aerial imagery (6"), 2015 were used to refine the Scientific External northern and southern Fillmore and Piru subbasins boundary. The Fillmore and Piru subbasins are hydrologically connected and the boundary between the subbasins is transitional with perennial rising groundwater observed in all but the longest sustained droughts on record. Groundwater level contours and the peak flow of this rising groundwater within the Santa Clara River determined by several years of in-stream flow measurements was used for the proposed Scientific Internal boundary modification. The location of the rising groundwater provides appropriate boundary conditions for water budget calculations and modeling of the subbasins. In addition, perennial rising groundwater is also observed at the transitional Santa Paula (4-04)/Fillmore subbasins boundary. The Santa Paula subbasin was adjudicated in 1996, and the court-defined Settlement Boundary does not include approximately 980 acres with 19 active wells that exist between the Settlement Boundary and the current DWR Bulletin 118 boundary between the Santa Paula and Fillmore subbasins. Hydrologically, there is not a distinct boundary separating these subbasins; rather, they have been loosely defined based on the occurrence of rising groundwater over an approximately 2-mile reach of the Santa Clara River, indicating a hydrogeologic constriction. The proposed Jurisdictional Internal modification snaps the Fillmore subbasin boundary approximately 3/8ths-mile west to the Santa Paula Settlement Boundary, thereby incorporating the 980 acres and 19 active wells within the Fillmore subbasin. Near Orcutt Canyon the northern extent of the Settlement Boundary is mapped just south of the existing DWR boundary for the Santa Paula basin. Both existing boundaries intended to follow the mapped northern extent of the Saugus Fm, but the Settlement Boundary falls south of the contact, as mapped by Dibblee. The new (western Fillmore basin) boundary proposed here projects the Settlement Boundary some 325 feet north in steep terrain to the northern extent of the Saugus Fm. These proposed modifications would improve the likelihood of sustainable management by including the hydrologically connected area between the eastern Santa Paula Settlement Boundary and the current western DWR Bulletin 118 boundary of the Fillmore subbasin within the area of the Groundwater Sustainability Plan (GSP) that will be developed for the Fillmore subbasin.

   Attachment(s):
4. List the existing basin(s)/subbasin(s) to be modified by this request

   • 4-004.04 SANTA CLARA RIVER VALLEY - SANTA PAULA
   • 4-004.06 SANTA CLARA RIVER VALLEY - PIRU
   • 4-004.05 SANTA CLARA RIVER VALLEY - FILLMORE
5. Provide the proposed name for the new basin(s) or subbasin(s)

C. Initial Notification and Combination of Requests

1. Was an initial notification submitted to the Department?

   Yes
   List of submitted initial notification for the selected basin(s)/subbasin(s).

   Local Agency	Potential Basin(s)/Subbasin(s)
   	4-004.05 SANTA CLARA RIVER VALLEY - FILLMORE , 4-004.06 SANTA CLARA RIVER VALLEY - PIRU

2. Does this application include a combination of requests?

   Yes

   If yes, describe:

   This application combines: (1) a Jurisdiction Internal modification of the Santa Paula (4-04)/Fillmore (4-05) subbasins boundary; with (2) a Scientific Internal modification of the Fillmore Basin/Piru subbasins (4-06) boundary; with (3) Scientific External north/south Fillmore and Piru subbasins boundary modification.

D. Required Documents for All Modifications

1. A copy of the statutory or other legal authority under which the requesting agency was created with specific citations to the provisions setting forth the duties and responsibilities of the agency.

Attachment(s):

• 2017-01 Electing to be GSA for Fillmore and Piru Basins 2017-06-26.pdf (1.3MB) Uploaded on 07/01/2018 at 01:51PM

2. A copy of the signed resolution adopted by the requesting agency formally initiating the boundary modification request process.

Attachment(s):

• 2018-03 Initiating Basin Boundary Modification Request Process 2018-03-26.pdf (1.2MB) Uploaded on 07/01/2018 at 01:52PM

3. A map of adequate scale (no greater than 1:24,000; e.g., 1:10,000 is not acceptable) showing the proposed modified basin boundary in relation to the existing Bulletin-118 basin boundary and the local agencies that are within or bordering the existing and proposed basin.

Attachment(s):

• D3 Piru and Fillmore basins overview, existing and proposed boundaries v2.pdf (7.3MB) Uploaded on 10/30/2018 at 05:06PM
• D3 edit, Santa Paula-Fillmore basin boundary zoom v2.pdf (1.4MB) Uploaded on 10/30/2018 at 04:17PM

4. A GIS shapefile of the proposed modified groundwater basin boundaries. Download Existing B118 basin shape file | DWR Spatial Data Standards

Attachment(s):

• FPBGSA_proposed_boundary_mods_2018_Oct_edits.zip (82.8kB) Uploaded on 10/30/2018 at 04:41PM

5. A GIS shapefile of the political boundaries of any affected or adjacent local agency. Download water agency shape file

Attachment(s):

• local agencies.zip (106.9kB) Uploaded on 07/01/2018 at 01:53PM

6. Any information, if necessary, to enable DWR to satisfy the requirements of a responsible agency pursuant to the California Environmental Quality Act.

The basin boundary modification is exempt from the California Environmental Quality Act (CEQA) because it is not a "Project" under CEQA. Given that the Basin Boundary adjustments do not meet the "Project" definition, there is no requirement to seek or make a finding for a Statutory or Categorical Exemption, nor provide any other CEQA treatment at all. Even if the basin boundary modification constitutes a project, it would be exempt because there it is no possibility that it will have a significant effect on the environment.

E. General Information

1. Describe the lateral boundaries of the alluvial aquifer or aquifers that form the groundwater basin and the definable bottom of the basin. The description must be in terms that are clear, definite, and sufficiently detailed to allow an authoritative map of the proposed basin boundaries to be plotted using the given description.

Please see attached Document.

Attachment(s):

• E1 Desc of the boundaries of the alluvial aquifers of the Fillmore and Piru Subbasins v4 2018 Oct.pdf (132.5kB) Uploaded on 10/31/2018 at 07:39AM

F. Notice and Consultation

1. List all local agencies and public water systems affected by the basin(s) modification request.

Please see attached Document.

Attachment(s):

• list of local agencies and public water systems v2 2018 Oct.docx (13.9kB) Uploaded on 10/10/2018 at 03:59PM

2. Explain the methods used to identify interested local agencies and public water systems in the affected basin(s):

The "List of Interested Parties" (uploaded below) included with the Fillmore and Piru Basins Groundwater Sustainability Agency's (FPBGSA) formation submittal through the SGMA Portal was used to identify interested local agencies and public water systems. Public water systems and interested local agencies identified in the list were compiled from the County of Ventura publication, Inventory of Public & Private Water Purveyors in Ventura County (2006). In addition, United Water Conservation District's list of groundwater pumpers within the DWR Bulletin 118 mapping of the Fillmore and Piru subbasins and those that will be included if the proposed basin boundary modification is approved was utilized to contact interested parties in the affected subbasins. Local agencies and public water systems in the Santa Paula basin have not been noticed, as these agencies already recognize the adjudication boundary of the Santa Paula basin as the Fillmore-Santa Paula basin boundary.

Attachment(s):

• F&PBGSA - List of Interested Parties.pdf (84.9kB) Uploaded on 07/01/2018 at 01:56PM

3. Provide information regarding the nature of consultations with affected or interested agencies. Attach and cite any copies of correspondences with local agencies and public water systems and/or any other persons or entities consulted.

A Joint Exercise of Powers Agreement by and among the City of Fillmore, the County of Ventura and United Water Conservation District created the Fillmore and Piru Basins Groundwater Sustainability Agency (FPBGSA). A member of each of these agencies sits on the six member governing Board of Directors. The other three Stakeholder Director seats are filled by a member of the Fillmore Basin Pumpers Association, the Piru Basin Pumpers Association and an environmental interests groups representative. These agencies and stakeholder representative directors were actively engaged in the proposed basin boundary modification process that culminated in a FPBGSA resolution (2018-03) to submit the proposed modifications. Early on in the basin boundary modification process, Castaic Lake Water Agency was contacted in regards to the mapping of the east end of the Piru subbasin (e-mail correspondence attached). County of Ventura staff was also consulted with in regards to the proposed modification of the Santa Paula/Fillmore subbasins boundary (correspondence attached). Ventura County submitted to be the Groundwater Sustainability Agency for the eastern portion of the Santa Paula subbasin that is outside of the Santa Paula Basin Adjudication (Settlement) Boundary with the intention of turning this area over to the FPBGSA through the 2018 DWR Basin Boundary Modification process and ensuing GSA boundary modification process. Mailers, newspaper notices, e-mails, telephone calls, online postings (FPBGSA's website and Facebook page), and public meeting presentations were used to engage the largest group practicable of stakeholders. Several parcel specific maps were produced for individuals that requested information on how the proposed basin boundary modification might affect their property.

Attachment(s):

• CLWA e-mail correspondence.pdf (133.3kB) Uploaded on 07/01/2018 at 01:57PM
• VC e-mail correspondence.pdf (3.4MB) Uploaded on 07/01/2018 at 01:57PM

4. Provide a summary of all public meetings at which the proposed boundary modification was discussed or considered by the requesting agency. Attach and cite any copies of agendas and notices published.

The Fillmore and Piru Basins Groundwater Sustainability Agency (FPBGSA) Board of Directors initiated the (a) filing of the preliminary notification with DWR that the FPBGSA is considering a basin boundary modification, (b) convening a workshop to discuss the technical basis for the boundary modification and solicit stakeholder input, and (c) begin the preparation of the basin boundary modification documentation required by DWR on August 28, 2017 at the FPBGSA's regular board meeting. The initial notification was submitted via the SGMA portal on August 31, 2017. At the October 30, 2017, the FPGSA Board of Directors discussed potential March 2018 dates for a public basin boundary modification workshop. At the February 20, 2018 regular board meeting, the FPBGSA Board of Directors heard a brief presentation on the proposed basin boundary modification and discussed potential workshop dates. March 16, 2018 was selected for a public workshop. A detailed basin boundary modification presentation (presentation slides uploaded below) was given at the public workshop. A time for public questions and comments was provided as was contact information for follow-ups on parcel specific questions. On March 26, 2018, the Board of Directors approved the submittal of the basin boundary modifications to DWR as presented to constituents and the general public at the well attended basin boundary modification workshop held on March 16, 2018. This Board of Directors' action was memorialized as Resolution 2018-03. A brief update of the status of the proposed basin boundary modification submittal was presented at the May 31, 2018 FPBGSA regular board meeting.

Attachment(s):

• 2017-08-28 FPBGSA Board Meeting Agenda FINAL.pdf (647.9kB) Uploaded on 07/01/2018 at 01:58PM
• 2017-10-30 FPBGSA Board Meeting Agenda FINAL.pdf (385.4kB) Uploaded on 07/01/2018 at 01:58PM
• 2018-02-20 FPBGSA Board Meeting Agenda FINAL.pdf (308.6kB) Uploaded on 07/01/2018 at 01:58PM
• 2018-02-26 FPBGSA Public Notice Fillmore Gazette re Basin Boundary Mod.pdf (678.8kB) Uploaded on 07/01/2018 at 01:58PM
• 2018-02-26 FPBGSA Public Notice Mailer re Basin Boundary Modification.pdf (387.4kB) Uploaded on 07/01/2018 at 01:58PM
• 2018-03-08 SPTimes FPBGSA Basin Boundary Workshop.pdf (427.7kB) Uploaded on 07/01/2018 at 01:58PM
• 2018-03-16 FPBGSA Basin Boundary Mod Workshop Presentation Slides.pdf (6.9MB) Uploaded on 07/01/2018 at 01:58PM
• 2018-03-26 FPBGSA Board Meeting Agenda FINAL.pdf (406.5kB) Uploaded on 07/01/2018 at 01:58PM
• 2018-05-31 FPBGSA Board Meeting Agenda FINAL.pdf (411.5kB) Uploaded on 07/01/2018 at 01:59PM

5. Attach a copy of all comments regarding the proposed boundary modification received by the requesting agency and a summary of any responses made by the requesting agency.

Several parcel specific maps were requested and produced for individuals that requested information on how the proposed basin boundary modification might affect their property; but no written comments were received by the requesting Agency from other local agencies or individuals in regards to the proposed basin boundary modification. In addition, there were no verbal objections raised in the requesting Agency's meetings or workshop in opposition to the proposed basin boundary modification. In response to specific guidance from DWR staff reviewing the proposed boundary modifications for the Piru and Fillmore basins, the proposed boundaries were edited in October 2018 to include additional areas of mapped alluvium.

G. General Existing Groundwater Management

1. Explain how sustainable groundwater management exists or could likely be achieved in the basin:

California Assembly Bill 3030 was enacted in 1992, which established in the California Water Code sections 10750-10756, a systematic procedure for a local agency to develop a groundwater management plan. Subsequently, in 1995, a Memorandum of Understanding (M.O.U.) was signed among United Water Conservation District, the City of Fillmore, water companies and other pumpers to establish how an AB 3030 groundwater management plan would be formulated for the Fillmore and Piru groundwater subbasins (M.O.U.,1995). The M.O.U. established that the Management Plan would be a cooperative plan for the basins. After the adoption of the M.O.U., a Groundwater Management Plan (Plan) was formulated and adopted in 1996. The Plan outlined the roles of the various parties in implementing a groundwater management program, including the establishment of a Groundwater Management Council to manage the Plan. A 2013 draft update to this Plan was prepared as a result of SB 1938 (2002) and AB 359 (2013) but was never finalized. The Draft Plan update included Basin Management Objectives (BMOs) for groundwater elevations, groundwater quality and surface water quality at various locations. In addition, United Water Conservation District has produced periodic (annual or biennial) reports on groundwater conditions in the subbasins. The report series contains recent and historical hydrologic information related to the Fillmore and Piru subbasins, including: data on precipitation, groundwater recharge, surface water flows, groundwater extractions, groundwater levels, surface water quality, groundwater quality, the Chloride TMDL for the upper Santa Clara River, wastewater treatment plant discharges, the Toland Road Landfill and changes in agricultural land use. The Fillmore and Piru subbasins AB 3030 Plan and United Water Conservation District's Groundwater Conditions Reports are part of a long history of groundwater management in Fillmore and Piru subbasins. The Groundwater Sustainability Plans that are required for both Fillmore and Piru subbasins under SGMA will further efforts to achieve sustainable groundwater management in these subbasins.

2. Explain how the proposed boundary modification would affect the ability of adjacent groundwater basins to sustainably manage groundwater in those groundwater basins.

The Fillmore (4-05) and Piru (4-06) subbasins are immediately adjacent to two other groundwater subbasins as defined in Bulletin 118. Santa Paula subbasin (4-04) is down-gradient (west) of Fillmore subbasin and Santa Clara River Valley East subbasin (4-07) is up-gradient (east) of Piru subbasin. These four subbasins are hydrologically connected and are part of the larger Santa Clara River Valley basin. No changes are proposed for the internal boundary between the Piru and Santa Clara Valley East subbasins. There are no negative impacts, and the lack of boundary modification efforts allow existing jurisdictions to operate as they are. Agency resources can go towards GSP development instead of boundary modifications, improving their ability to manage groundwater sustainably. The proposed modification to the Piru-Fillmore boundary would bring this boundary into agreement with the boundary that has been used locally for years. The proposed boundary is consistent with what was used for the AB 3030 management actions and reporting that was established in 1997 and continued until the passage of SGMA. The Pumpers Associations of the Piru and Fillmore basins relied extensively on the historical data sets and reporting that was generated as part of the AB 3030 process, and the historic distribution of pumping between the two basins was relied upon when establishing the Associations and generating pump charges for the two associations. These Pumper Associations are represented on the GSA board. A failure to modify the basins as proposed here would invalidate significant past work and negatively affect the ability of the Fillmore and Piru basins GSA to move forward developing sustainability plans for these basins. The Santa Paula subbasin was adjudicated in 1996 and the Settlement Boundary (stipulated by local pumpers and management agencies) delineating the area included in the adjudication does not include an area of approximately 980 acres and 19 active wells that are located east of the adjudication boundary and west of DWR's Fillmore-Santa Paula boundary. The proposed Jurisdictional Internal modification snaps the Santa Paula/Fillmore subbasins boundary west to the adjudication boundary to incorporate this area within the Fillmore subbasin. This proposed modification would improve the likelihood of sustainable management by including this hydrologically-connected area with the Fillmore subbasin and allow the pumpers and other stakeholders in this area to participate in the Groundwater Sustainability Plan (GSP) that will be developed for the Fillmore subbasin. Without this modification there would exist a "gap" in managed areas between the Fillmore subbasin and the adjudicated portion of Santa Paula subbasin. DWR's Draft 2018 prioritization has designated the entire Santa Paula subbasin as "Very Low" priority because most of the subbasin is adjudicated, thus a Groundwater Sustainability Plan would not required for this area, even though it lies outside the adjudicated area. Significant groundwater production occurs in this management area "gap" in the Santa Paula subbasin. This gap, if not managed under a Groundwater Sustainability Plan, would complicate water budget calculations and accounting of underflow between the Santa Paula and Fillmore subbasins. In addition, uncontrolled pumping from this area could make it difficult for either the Santa Paula or the Fillmore subbasins to achieve sustainability. Failure to approve the proposed boundary modification will result in significant unnecessary work, create much uncertainty, and detract from the GSA's ability to perform productive work developing sustainability criteria and a GSP for the Fillmore basin.

3. Provide a historical summary of the sustainable management of groundwater levels in the proposed basin(s) or subbasin(s).

See Chapter 6 of the attached 2014 and 2015 Fillmore and Piru Basins Biennial Groundwater Conditions Report.

Attachment(s):

• 2014-2015 Piru & Fillmore basins Biennial GW Cond Rpt FINAL.pdf (4.5MB) Uploaded on 07/01/2018 at 02:11PM

4. Discuss potential impacts to state programs resulting from the proposed boundary modification, including, but not limited to, the California Statewide Groundwater Elevation Monitoring (CASGEM), Groundwater Management Plans developed pursuant to AB 3030, Groundwater Sustainability Plans developed pursuant to the Sustainable Groundwater Management Act, any applicable state or regional board plans, and other water management and land use programs.

Reporting for CASGEM is not expected to be impacted by the proposed basin boundary modification. Ventura County reports data for CASGEM from a number of wells within the Fillmore and Piru subbasins, and is the CASGEM reporting agency for all basins in the County and will continue to serve in this capacity after basin modification. The AB 3030 process in Fillmore and Piru subbasins has been superseded by the Sustainable Groundwater Management Act and the AB 3030 Groundwater Management Council has been disbanded.

H. Local Support

1. Provide any evidence that sufficient information was provided to affected agencies and systems regarding the proposed boundary modification.

Mailers, newspaper notices, e-mails, telephone calls, online postings (FPBGSA's website and Facebook page), and public meeting presentations including a detailed public workshop were used to engage the largest group practicable of stakeholders. Several parcel specific maps were produced for individuals that requested information on how the proposed basin boundary modification might affect their property.

2. Provide a list of all affected agencies and affected systems that submitted comments and/or documents in support or opposition to the proposed boundary. The agency submitting their support or opposition for a boundary modification must provide a copy of a resolution formally adopted by the decision-making body of the affected agency or system or a letter signed by an executive officer or other official with appropriate delegated authority who represents the agency or system. Attach copies of the resolution and/or signed letter detailing the support or opposition submitted.

No affected agencies or affected systems submitted comments and/or documents in opposition to the proposed boundary modification. Attached are letters of support from the three member agencies (City of Fillmore, the County of Ventura and United Water Conservation District) that signed the Joint Exercise of Powers Agreement that created the Fillmore and Piru Basins Groundwater Sustainability Agency.

Attachment(s):

• FPBGSA Basin Boundary Mod_UWCD Letter of Support - signed.pdf (499.7kB) Uploaded on 07/01/2018 at 02:04PM
• FPBGSA Basin Boundary Mod_City of Fillmore Letter of Support - signed.pdf (54.2kB) Uploaded on 07/01/2018 at 02:04PM
• FPBGSA Basin Boundary Mod_VC BOS Agenda Item 061918 & Ventura County Letter of Support - signed.pdf (4.3MB) Uploaded on 07/01/2018 at 02:04PM

3. Provide any evidence that rebuts any opposition to the proposed boundary modification.

No opposition has been received to date.

I. Hydrogeologic Conceptual Model

1. Principal aquifer units within requested basin.
2. Lateral boundaries of the proposed basin, including:
   1. Geologic features that significantly impede or impact groundwater flow.
   2. Aquifer characteristics that significantly impede or impact groundwater flow.
   3. Significant geologic and hydrologic features and conditions of the principle aquifer units, as appropriate, including information regarding the confined or unconfined nature of the aquifer, facies changes, truncation of units, the presence of faults or folds that impede groundwater flow, or other groundwater flow restricting features.
   4. Key surface water bodies, groundwater divides and significant recharge sources.
3. Recharge and discharge areas within the basin.
4. Definable bottom of the basin or subbasin.

The department may waive this requirement for an internal boundary modification if the requesting agency is able to demonstrate that the proposed boundary modification is unlikely to affect sustainable groundwater management.

Fillmore and Piru Basins Groundwater Sustainability Agency (FPBGSA) requests that the Department of Water Resources waive, at this time, the requirement for a comprehensive hydrogeologic conceptual model. Much is known about these subbasins and this information is referenced below. Currently an effort is underway to revise the conceptual model for Fillmore and Piru subbasins as part of United Water Conservation District's effort to develop a numerical groundwater flow model for its service area that includes the Fillmore and Piru subbasins. 1) Principal aquifer units within requested basin: see Chapter 2 from the attached 2014 and 2015 Fillmore and Piru Basins Biennial Groundwater Conditions Report. 2) Lateral boundaries of the proposed basin: see attached Fillmore and Piru_DWR GW subbasins explanation of proposed edits. 2a-2c) See Chapter 2 from the attached 2014 and 2015 Fillmore and Piru Basins Biennial Groundwater Conditions Report. 2d-3) See Figure 7 from the attached 2014 and 2015 Fillmore and Piru Basins Biennial Groundwater Conditions Report. 4) See Chapter 2 from the attached 2014 and 2015 Fillmore and Piru Basins Biennial Groundwater Conditions Report.

Attachment(s):

• 2014-2015 Piru & Fillmore basins Biennial GW Cond Rpt FINAL.pdf (4.5MB) Uploaded on 07/01/2018 at 02:11PM
• K1 Description of Piru basin boundaries v2.pdf (67.1kB) Uploaded on 10/30/2018 at 04:54PM
• K1 Description of Fillmore basin boundaries v2.pdf (68.3kB) Uploaded on 10/30/2018 at 04:54PM

J. Technical Studies for External Scientific Modifications

1. A qualified map that depicts the lateral boundaries of the aquifers that define the basin or subbasin.

Dibblee Geologic Map 7.5-minute Quadrangles, VC, CA, 1990s (1:24,000) were used to refine the Scientific External north/south Fillmore and Piru subbasins boundary. Channel Island Regional GIS Collaborative (CIRGIS) aerial imagery (6"), 2015 was used to edit some misplaced geologic contacts on the geologic maps.

Attachment(s):

• SantaPaula_Dibble legend clip.pdf (622.5kB) Uploaded on 10/11/2018 at 09:30AM
• J1 Surface Geology Santa Paula - Dibblee Quads.pdf (3.1MB) Uploaded on 10/11/2018 at 09:09AM
• J1 Piru and Fillmore basins, existing and proposed boundaries, Dibblee base v2.pdf (7.3MB) Uploaded on 10/30/2018 at 05:07PM

2. A technical study that provides subsurface data that demonstrates the vertical thickness and relevant physical properties of the alluvial aquifer or stacked series of alluvial aquifers.

Please see attached Documents.

URL: https://www.unitedwater.org/images/stories/reports/GW-Conditions-Reports/2017/UWCD%20Santa%20Paula_Final%20Report_052517_reduced.pdf

Attachment(s):

• Hanson et al 2003 - text only.pdf (13.8MB) Uploaded on 07/01/2018 at 02:43PM
• Hanson et al 2003 - appendices.pdf (1.9MB) Uploaded on 07/01/2018 at 02:43PM
• Mann 1959 A Plan for Ground Water Management.pdf (8.8MB) Uploaded on 07/01/2018 at 02:44PM
• CH2M Hill, 2006, GSWI_FinalTask2A_Report Conceptual Model.pdf (67.1MB) Uploaded on 07/01/2018 at 02:45PM

K. Technical Studies for Internal Scientific Modifications

1. A qualified map depicting structural geologic features that could significant impact or impede lateral groundwater flow.

Please see attached Dibblee maps. Thomas Dibblee mapped surface geology across much of Southern CA. Dibblee was a prolific mapper but did not walk each contact that he mapped. His maps are considered to be good reconnaissance level maps and in many areas they represent the most complete mapping available on a 1:24,000 scale. Dibblee maps are available for purchase at: https://store.aapg.org/ATSResources/product-splash/dibblee.aspx. As this is copyrighted material the georeferenced files cannot be uploaded to DWR. In certain areas the Dibblee maps appear to have some minor inaccuracies and the basin boundary modifications proposed here relied on recent aerial photography (Channel Island Regional GIS Collaborative (CIRGIS) Aerial Imagery (6"), 2015) to follow geologic contacts more accurately than what was represented on the Dibblee maps. This aerial imagery is also a copyrighted product and cannot be uploaded to DWR.

Attachment(s):

• K1 Description of Piru basin boundaries v2.pdf (67.1kB) Uploaded on 10/30/2018 at 05:35PM
• K1 Piru and Fillmore basins overview, existing and proposed boundaries v2.pdf (7.3MB) Uploaded on 10/30/2018 at 05:35PM
• K1 Dibblee Quad Zoom - East Piru v2.pdf (5.5MB) Uploaded on 10/30/2018 at 05:35PM
• K1 Dibblee Quad Zoom - West Piru v2.pdf (4.6MB) Uploaded on 10/30/2018 at 05:36PM
• K1 Description of Fillmore basin boundaries v2.pdf (68.3kB) Uploaded on 10/30/2018 at 05:36PM
• K1 Dibblee Quad Zoom - East Fillmore v2.pdf (3.9MB) Uploaded on 10/30/2018 at 05:36PM
• K1 Dibblee Quad Zoom - West Fillmore v2.pdf (4.1MB) Uploaded on 10/30/2018 at 05:36PM

2. Geologic and hydrologic evidence of groundwater conditions by attaching or providing a URL to any of the following:
   1. Historical and current potentiometric surface maps, groundwater levels, groundwater recharge and discharge areas of the aquifer system within the vicinity of the proposed boundary modification.
   2. Aquifer performance testing results demonstrating basin boundary condition response.
   3. Water quality information of the aquifer system including but not limited to general water quality parameters and isotopic analysis.
   4. Supporting certified geophysical studies.
   5. Any other pertinent information.

The Fillmore and Piru subbasins are hydrologically connected and the boundary between the subbasins is transitional with perennial rising groundwater observed in all but the longest sustained droughts on record. Groundwater level measurements contoured over many years were used for the proposed Scientific Internal boundary modification. The most recent water level contour maps used for the proposed basin boundary modification are included as Figures 3 - Figure 6 from the attached 2014 and 2015 Fillmore and Piru Basins Biennial Groundwater Conditions Report. The water level contours "stack up" down-gradient from the Fillmore and Piru subbasins boundary. Note that the basin boundaries displayed in the figures are not DWR's Bulletin 118 basin boundaries but the boundary between Fillmore and Piru subbasins is in the same location as the proposed modification basin boundary location. The peak flow of the rising groundwater within the Santa Clara River determined by several years of in-stream flow measurements was also used for the proposed Scientific Internal boundary modification. The location of the rising groundwater provides appropriate boundary conditions for water budget calculations and modeling of the subbasins.

Attachment(s):

• 2014-2015 Piru & Fillmore basins Biennial GW Cond Rpt FINAL.pdf (4.5MB) Uploaded on 07/01/2018 at 02:11PM
• K2 Piru - Fillmore boundary add 2015 WLE v2.pdf (2.1MB) Uploaded on 10/30/2018 at 05:45PM
• K2 Fillmore - SPB boundary add 2015 WLE v2.pdf (2.1MB) Uploaded on 10/30/2018 at 05:46PM

L. Technical Studies for All Jurisdictional Modifications

1. A water management plan that covers or is in the immediate vicinity of the proposed basin or portion of the proposed basin and satisfies the requirement of Water Code sections 10753.7(a) or 10727 by attaching one of the following:
   1. An adopted groundwater management plan, a basin wide management plan, or other integrated regional water management program or plan.
   2. Management pursuant to an adjudication action.
   3. One or more technical studies that cover the relevant portion of a basin or subbasin and adjacent areas.

Attachment(s):

• Santa Paula Basin Settlement Document 1996.pdf (5.6MB) Uploaded on 07/01/2018 at 02:51PM

2. A statement of the existing and planned coordination of sustainable groundwater management activities and responsibilities where required.

As is mentioned above, the Santa Paula subbasin was adjudicated in 1996 and the court defined Settlement Boundary delineating the area included in the adjudication does not include the area of approximately 980 acres that contains 19 active wells that are within the easternmost portion of the Santa Paula subbasin as defined by DWR Bulletin 118, but outside the adjudication boundary. The proposed Jurisdictional Internal modification snaps the Santa Paula/Fillmore subbasins boundary west to the adjudication boundary to include this area within the Fillmore subbasin. The adjudicated portion of Santa Paula subbasin (most of the subbasin) is governed by a court mandated Technical Advisory Committee (TAC). It is anticipated that an interbasin coordination agreement will be entered into between the Santa Paula Basin Pumpers Association (SPBPA), United Water Conservation District, and the City of Ventura (collectively as the constituent members of the TAC) and the Fillmore and Piru Basins Groundwater Sustainability Agency (FPBGSA). Ultimately, whatever coordination arrangements materialize from the coordination effort will need to be approved by the Court for the Santa Paula Basin adjudication under the court?s continuing jurisdiction.