B. Description of Proposed Boundary Modification

1. Short Description

   A scientific modification request to subdivide (i.e. scientific internal modification) and exclude (i.e. scientific external modification) portions of the Santa Maria River Valley Basin (Basin No. 3-012).
2. Type of basin boundary revision

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

   See attachment: B3 Narrative Overview

   Attachment(s):

   B3 Narrative Overview.pdf (1.5MB) Uploaded on 08/31/2018 at 03:55PM
4. List the existing basin(s)/subbasin(s) to be modified by this request

   • 3-012 SANTA MARIA
5. Provide the proposed name for the new basin(s) or subbasin(s)

   1. Santa Maria River Valley - Santa Maria (subbasin); 2. Santa Maria River Valley - Arroyo Grande (subbasin)

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)

2. Does this application include a combination of requests?

   Yes

   If yes, describe:

   This application consists of multiple scientific external and internal modification requests within portions of the Santa Maria River Valley Groundwater Basin within San Luis Obispo County (except for one proposed basin boundary modification that is in both San Luis Obispo County and Santa Barbara County).

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):

• D1 County of San Luis Obispo GSA Resolution.pdf (3.1MB) Uploaded on 09/04/2018 at 05:35PM

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

Attachment(s):

• D2 County of SLO NOI Signed Resolution.pdf (2.6MB) Uploaded on 09/04/2018 at 05:35PM

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 Proposed Boundary Map and Key_rev.pdf (6.7MB) Uploaded on 11/27/2018 at 08:13AM

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

Attachment(s):

• D4 Proposed Modified Basin Boundaries_rev.zip (63.3kB) Uploaded on 11/27/2018 at 08:11AM

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

Attachment(s):

• D5 Political Boundaries and Agencies&Systems_polygons only.zip (669.2kB) Uploaded on 09/04/2018 at 11:11AM

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

See attachment: D6 Notice of Exemption (CEQA)

Attachment(s):

• D6 Notice of Exemption (CEQA).pdf (2.9MB) Uploaded on 09/04/2018 at 05:36PM

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.

The following is a description of the proposed resultant subdivision of the Santa Maria River Valley Groundwater Basin into two subbasins. Santa Maria River Valley - Santa Maria subbasin: The Santa Maria River Valley - Santa Maria subbasin underlies the Santa Maria Valley in the coastal portion of northern Santa Barbara and southern San Luis Obispo Counties, Nipomo Mesa, Tri-Cities Mesa, and Arroyo Grande Plain. The proposed lateral boundary is delineated on the west and southwest by the Pacific Ocean, on the east and northeast by the Wilmar Avenue Fault and Santa Maria River Fault Zones, on the east by the San Rafael Mountains and the Santa Maria River Fault Zones, on the southwest by the Casmalia Hills, on the south by the Solomon Hills and the San Antonio Creek Valley Groundwater Basin, and aligning along the adjudicated boundaries of the Northern Cities Management Area, Nipomo Mesa Management Area, and Santa Maria Valley Management Area. The bottom boundary of the subbasin is identified as the contact between the saturated sediments of Paso Robles/Careaga Formations at depths ranging from 600 to 2,500 feet and the underlying Monterey and/or Obispo Formations. Santa Maria River Valley - Arroyo Grande subbasin: The Santa Maria River Valley - Arroyo Grande subbasin underlies the Arroyo Grande Creek Valley. The proposed lateral boundary is delineated by the contact of the Recent Alluvium with the bedrock of the Pismo, Monterey, Obispo, and Franciscan Formations cropping out in the mountains of the Santa Lucia Range surrounding the Arroyo Grande Creek Valley and the Tar Springs Creek Valley, and ends along the Wilmar Avenue Fault Zone to the south/southwest along the adjudicated boundary of the Northern Cities Management Area. The bottom boundary of the subbasin is identified as the contact between the saturated Recent Alluvium ranging from 20 feet to 150 feet deep and the underlying bedrock of the Pismo Formation or the Monterey/Obispo Formations.

F. Notice and Consultation

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

See attachment: F1 Affected Agencies and Public Water Systems. Please note that public water systems in Santa Barbara County are not included in the GIS shapefiles upload in D5 due to the lack of mapping information with regard to the service areas of the water systems.

Attachment(s):

• F1 Affected Agencies and Public Water Systems.pdf (2MB) Uploaded on 09/04/2018 at 05:47PM

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

The criteria used for identifying affected agencies or public water systems was to include those agencies and systems "whose jurisdictional area would, as a result of a boundary modification, include more, fewer, or different basins or subbasins than without the modification" (California Water Code Section 341(c) and (d)). The basin boundaries, local agencies, and public water systems were identified and compiled through the County of San Luis Obispo's (County's) existing geospatial information system (GIS) databases. The County's GIS database sources the Bulletin 118 groundwater basin boundary map from the California Department of Water Resources. The boundaries and lists of local agencies and public water systems are derived from the San Luis Obispo Local Agency Formation Commission and County's Environmental Health Services GIS databases, respectively. The County Environmental Health Services Department updates the public water system database with current information and as defined in Section 116275 of the California Safe Drinking Water Act, which is in Part 12, Chapter 4 of the California Health and Safety Code. Additionally, the Santa Barbara County Water Agency and Santa Barbara County Public Health Department provided information on the local agencies and public water systems overlying the Santa Maria and San Antonio Groundwater Basins within Santa Barbara County, respectively.

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.

See attachments: F3 Nature of Consultations; F3a Consultation Letters

Attachment(s):

• F3a Consultation Letters.pdf (13.1MB) Uploaded on 09/04/2018 at 05:57PM
• F3 Nature of Consultations.pdf (1.9MB) Uploaded on 09/04/2018 at 05:55PM

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.

See attachments: F4 Summary of Public Meetings; F4a Meeting Materials

Attachment(s):

• F4 Summary of Public Meetings.pdf (1MB) Uploaded on 09/04/2018 at 06:01PM
• F4a Meeting Materials.pdf (118.3MB) Uploaded on 09/04/2018 at 06:02PM

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.

See attachments: F5 All Comments Received; F5a County Responses; F5b County Response to Steelhead Concerns

Attachment(s):

• F5 All Comments Received.pdf (18.5MB) Uploaded on 09/04/2018 at 06:08PM
• F5a County Responses.pdf (1.5MB) Uploaded on 09/05/2018 at 09:15AM
• F5b County Response to Steelhead Concerns.pdf (2.5MB) Uploaded on 11/08/2018 at 11:34AM

H. Local Support

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

See attachment: H1 Information Provided to Affected Agencies and Systems

Attachment(s):

• H1 Information Provided to Affected Agencies and Systems.pdf (2.5MB) Uploaded on 09/04/2018 at 06:13PM

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.

See attachment: H2 Documents Submitted by Affected Agencies and Systems

Attachment(s):

• H2 Documents Submitted by Affected Agencies and Systems.pdf (10MB) Uploaded on 09/04/2018 at 06:16PM

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

See attachment: H3 Rebuttal of Opposition

Attachment(s):

• H3 Rebuttal of Opposition.pdf (1.9MB) Uploaded on 09/05/2018 at 09:22AM

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.

See attachments: I 1_4 Hydrogeologic Conceptual Model; SMGB Characterization_Planning Study; SMRVGB BBMR Technical Report

Attachment(s):

• SMGB Characterization_Planning Study.pdf (8.6MB) Uploaded on 09/05/2018 at 09:24AM
• I 1_4 Hydrogeologic Conceptual Model.pdf (679.9kB) Uploaded on 09/05/2018 at 09:22AM
• SMRVGB BBMR Technical Report.pdf (177.5MB) Uploaded on 09/05/2018 at 09:26AM

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.

See attachment: J1 Qualified map_Lat Boundary (Figure 1)

Attachment(s):

• J1 Qualified map_Lat Boundary (Figure 1).pdf (5.6MB) Uploaded on 09/05/2018 at 09:30AM

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.

See attachments: J2 Technical Study; SMRVGB BBMR Technical Report; SMGB Characterization_Planning Study

Attachment(s):

• J2 Technical Study.pdf (1.6MB) Uploaded on 09/05/2018 at 09:32AM
• SMRVGB BBMR Technical Report.pdf (177.5MB) Uploaded on 09/05/2018 at 09:40AM
• SMGB Characterization_Planning Study.pdf (8.6MB) Uploaded on 09/05/2018 at 09:42AM

K. Technical Studies for Internal Scientific Modifications

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

See attachment: K1 Qualified Maps_Impede Flow

Attachment(s):

• K1 Qualified Maps_Impede Flow.pdf (58MB) Uploaded on 09/05/2018 at 09:51AM

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.

See attachments: K2 Evidence of Groundwater Conditions; SMRVGB BBMR Technical Report; SMGB Characterization_Planning Study

Attachment(s):

• K2 Evidence of Groundwater Conditions.pdf (1.6MB) Uploaded on 09/05/2018 at 09:54AM
• SMRVGB BBMR Technical Report.pdf (177.5MB) Uploaded on 09/05/2018 at 09:55AM
• SMGB Characterization_Planning Study.pdf (8.6MB) Uploaded on 09/05/2018 at 09:56AM