B. Description of Proposed Boundary Modification

1. Short Description

   Arroyo Santa Rosa GSA BBM.
2. Type of basin boundary revision

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

   The Santa Rosa Basin boundary as represented in the DWR Bulletin 118 GIS database, currently the official state definition of the basin's extent, does not include groundwater wells that may impact hydrologic conditions within the basin and does not accurately reflect the basin's geology. The proposed modification to the boundary would capture the outlying wells and, by according with the extent of alluvium in the basin, better incorporate the water-bearing formations of the Santa Rosa Valley, thereby increasing the likelihood of sustainable management.

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

   • 4-007 ARROYO SANTA ROSA VALLEY
5. Provide the proposed name for the new basin(s) or subbasin(s)

   no change

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)
   	4-007 ARROYO SANTA ROSA VALLEY

2. Does this application include a combination of requests?

   No

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):

• Arroyo Santa Rosa Valley Basin GSA JPA (signed).pdf (3.6MB) Uploaded on 07/23/2018 at 02:20PM

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

Attachment(s):

• ASRGSA Board Resolution 2018-01 - initiating the basin boundary modification request.pdf (1.3MB) Uploaded on 07/23/2018 at 02:26PM

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--ASRGSA Affected Agencies.pdf (1.3MB) Uploaded on 08/21/2018 at 09:54AM

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

Attachment(s):

• GroundwaterBasinMod_20180817.zip (36.4kB) Uploaded on 08/21/2018 at 09:57AM

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

Attachment(s):

• FCGMA shapefile.zip (52.5kB) Uploaded on 07/23/2018 at 02:49PM

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

no information necessary

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.

Attachment(s):

• ASRGSA BBM General Information.pdf (61.9kB) Uploaded on 07/23/2018 at 02:45PM

F. Notice and Consultation

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

Fox Canyon Groundwater Management Agency

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

Attachment(s):

• ASRGSA BBM Section F-2.pdf (183.4kB) Uploaded on 07/23/2018 at 02:52PM

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.

March 12, 2018: Meeting with Jeff Pratt, Director, Ventura County Public Works Agency and Executive Officer of Fox Canyon Groundwater Management Agency. April 3, 2018: email exchange with Kim Loeb, Ventura County Watershed Protection District and Manager at Fox Canyon Groundwater Management Agency.

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.

March 22, 2018 ASRGSA Board of Directors (agenda and minutes attached) May 31, 2018 ASRGSA Board of Directors (agenda and draft minutes attached) April 5, 2018 FCGMA TAG (agenda and draft minutes attached)

Attachment(s):

• FCGMA TAG 04-05-18 meeting agenda.pdf (306.2kB) Uploaded on 07/24/2018 at 11:44AM
• Minutes of 05-31-18 meeting.pdf (162.2kB) Uploaded on 07/24/2018 at 11:21AM
• FCGMA TAG 04-05-2018 minutes draft.pdf (241.7kB) Uploaded on 07/24/2018 at 11:44AM
• 05-31-18 Agenda.pdf (160.2kB) Uploaded on 07/23/2018 at 03:32PM
• minutes of argsa 3-22-18 board meeting.pdf (827.4kB) Uploaded on 07/23/2018 at 03:32PM
• 05-31-18 ASRGSA Agenda PACKET.pdf (5.7MB) Uploaded on 07/24/2018 at 11:22AM

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.

None.

H. Local Support

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

See previous Section F, Notice and Consultation, regarding consultation with the Fox Canyon Groundwater Management Agency

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 comments submitted.

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

N/A

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.

Attachment(s):

• ASRGSA Basin Boundary Modification_20180706.pdf (3.2MB) Uploaded on 07/23/2018 at 03:59PM

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.

Attachment(s):

• MAPS from ASRGSA BBM report.pdf (2.4MB) Uploaded on 07/24/2018 at 11:48AM

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.

California Department of Water Resources (DWR), 2006. Hydrologic Region South Coast, Arroyo Santa Rosa Valley Groundwater Basin. California?s Groundwater Bulletin 118. Last update 1/20/2006. . Camrosa Water District, Santa Rosa Mutual Water Company, Property Owners, 1997. Santa Rosa Basin Groundwater Management Plan For Areas Within the Arroyo Santa Rosa Portion of the Santa Rosa Groundwater Basing Not Within the Boundaries of the Fox Canyon Groundwater Management Agency. April 24. . MWH, 2013. Santa Rosa Basin Groundwater Management Plan. Prepared for Camrosa Water District. August. • Yerkes, R.F., and Campbell, R.H., 1997, Preliminary geologic map of the Moorpark 7.5' quadrangle, southern California: a digital database: U.S. Geological Survey, Open-File Report OF-97-260, scale 1:24,000 • Yerkes, R.F., and Campbell, R.H., 1997, Preliminary geologic map of the Newbury Park 7.5' quadrangle, southern California: a digital database: U.S. Geological Survey, Open-File Report OF-97-459, scale 1:24,000 • Yerkes, R.F., and Campbell, R.H., 1997, Preliminary geologic map of the Simi [Simi Valley West] 7.5' quadrangle, southern California: a digital database: U.S. Geological Survey, Open-File Report OF-97-259, scale 1:24,000 • Yerkes, R.F., and Campbell, R.H., 1997, Preliminary geologic map of the Thousand Oaks 7.5' quadrangle, southern California: a digital database: U.S. Geological Survey, Open-File Report OF-95-88, scale 1:24,000

Attachment(s):

• ASRGSA Basin Boundary Modification_20180706.pdf (3.2MB) Uploaded on 07/23/2018 at 04:00PM
• GeologyPolyMerge_20180625.zip (607.8kB) Uploaded on 10/19/2018 at 04:23PM