B. Description of Proposed Boundary Modification

1. Short Description

   Modify Bulletin 118 defined Petaluma Valley Groundwater Basin to incorporate the jurisdictional area of the City that is currently in the Wilson Grove Formation Highlands Groundwater Basin.
2. Type of basin boundary revision

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

   The City of Petaluma is requesting modification of the Bulletin 118 defined Petaluma Valley groundwater basin to incorporate the jurisdictional area of the City of Petaluma that is currently in the Wilson Grove Formation Highlands (Wilson Grove) groundwater basin. The City of Petaluma is already a participant in the Petaluma Valley Groundwater Sustainability Agency (GSA). If the 2018 SGMA Basin Prioritization elevates the priority of the Wilson Grove groundwater basin from very low to medium as anticipated, this would trigger the formation of a GSA. Integrating the entire Petaluma jurisdiction within the existing Petaluma Valley GSA would avoid the potential for inconsistent or conflicting groundwater management approaches that may result from dividing a single municipality with local regulatory authority over land and water use within its boundaries into separate groundwater basins and GSAs. The City of Petaluma has coordinated with the Petaluma Valley GSA and local agencies in the adjoining Wilson Grove groundwater basin, as evident by the letters of support for the proposed modification. Revision of the Petaluma Valley groundwater basin will promote sustainable groundwater management in the jurisdictional area of Petaluma that is currently within the Wilson Grove groundwater basin and will not affect the ability of Wilson Grove to sustainably manage groundwater if that basin is elevated to medium priority.

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

   • 1-059 WILSON GROVE FORMATION HIGHLANDS
   • 2-001 PETALUMA VALLEY
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)
   	2-001 PETALUMA VALLEY , 1-059 WILSON GROVE FORMATION HIGHLANDS
   	1-059 WILSON GROVE FORMATION HIGHLANDS
   Marin County	1-059 WILSON GROVE FORMATION HIGHLANDS , 2-027 SAND POINT AREA

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):

• D.1. Legal Authority.pdf (108.8kB) Uploaded on 08/24/2018 at 02:47PM

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

Attachment(s):

• Reso 2018-124 NCS_07-16-2018.pdf (224.9kB) Uploaded on 08/24/2018 at 02:47PM

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):

• BasinBoundaryExtended2.pdf (1.6MB) Uploaded on 08/29/2018 at 10:19AM

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

Attachment(s):

• PetalumaValley_updated (25kB) Uploaded on 11/20/2018 at 10:04AM

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

Attachment(s):

• Affected Agency Boundaries.zip (176.2kB) Uploaded on 09/07/2018 at 09:47AM

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

The proposed modification of the Petaluma Valley groundwater basin boundary is not a Project as defined by CEQA in accordance with Section 15378(b)(5) of the CEQA Guidelines because the proposed boundary modification consists of organizational or administrative activities of governments that will not result in direct or indirect physical changes in 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.

A description of the basin boundaries is attached. The objective of the modification is to include into the Petaluma Valley basin the portion of Petaluma city limits that is currently in the adjoining Wilson Grove Formation Highlands basin.

Attachment(s):

• E1_PV Basin Boundary Description.docx (16.3kB) Uploaded on 09/14/2018 at 03:12PM
• 2-1_Petaluma Valley_6-30-14.pdf (45.6kB) Uploaded on 09/14/2018 at 03:21PM

F. Notice and Consultation

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

Petaluma Valley Groundwater Sustainability Agency, County of Sonoma, Sonoma Water, and County of Marin.

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

Consulted with Petaluma Valley GSA, Sonoma Water, and Sonoma and Marin Counties. Reviewed existing maps of agency boundaries, established GSAs, and 2018 Draft Basin Prioritization.

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.

In-person meetings, teleconferences, and email communication with affected and interested agencies.

Attachment(s):

• F.3 Correspondence with Local Agencies.docx (18.8kB) Uploaded on 09/12/2018 at 09:11AM
• 7-10-18 DRAFT AGENDA WGHF Meeting.docx (1.5MB) Uploaded on 09/12/2018 at 09:11AM
• 8-16-18 Wilson Grove BBM Meeting.docx (16kB) Uploaded on 09/12/2018 at 09:13AM

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.

City of Petaluma held multiple public meetings where the proposed boundary modification was discussed. The City is a member of the Petaluma Valley GSA, and several GSA Board and Advisory Committee meetings were held that discussed the proposed boundary modification. A notice of public meeting was included in the local Argus-Courier that the City of Petaluma was to hold a public meeting to gather information from the public and to consider passage of a resolution by City Council regarding the proposed basin boundary modification. Attached are agendas of all Petaluma Valley GSA Board and Advisory Committee meetings where the proposed boundary modification was discussed. Also attached is public notice of and City Council meeting agenda to discuss and approve resolution regarding boundary modification.

Attachment(s):

• 2018_08_23_PVGSA_Board Meet Agenda_Packet.pdf (309.3kB) Uploaded on 09/12/2018 at 10:45AM
• 2018-01-25_PVGSA_Board Meet Agenda_Packet.pdf (2.6MB) Uploaded on 09/12/2018 at 10:45AM
• 2018-03-22_PVGSA_Board Meet Agenday_Packet.pdf (2.4MB) Uploaded on 09/12/2018 at 10:45AM
• 2018-06-13_PV AdvisoryCommittee Meet Agenda_Packet.pdf (499.1kB) Uploaded on 09/12/2018 at 10:45AM
• 2018-06-21_PVGSA_Board Meet Agenda_Packet.pdf (2.5MB) Uploaded on 09/12/2018 at 10:45AM
• Certification of Publication 07_12_2018.pdf (150.2kB) Uploaded on 09/12/2018 at 10:46AM
• Petaluma City Council 7-16-18 Agenda_Basin Boundary Request Application.htm (39.4kB) Uploaded on 09/12/2018 at 10:50AM

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.

Attached are letters of support from County of Sonoma and Sonoma Water, County of Marin, and Petaluma Valley Groundwater Sustainability Agency.

Attachment(s):

• Marin County Letter of Support for Petaluma.pdf (284.1kB) Uploaded on 09/12/2018 at 10:52AM
• 8-28-18 COUNTY_SONOMA WATER support letter_city of Petaluma.pdf (138.1kB) Uploaded on 09/12/2018 at 10:53AM

G. General Existing Groundwater Management

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

The Petaluma Valley groundwater basin is currently designated medium-priority. The City of Petaluma is a member of the Petaluma Valley GSA which formed in 2017 as a JPA. The Petaluma Valley GSA initiated the development of its Groundwater Sustainability Plan in 2018, with plan adoption set for the end of 2021. To assist in the development of the GSP, the City of Petaluma and Sonoma Water worked with USGS to characterize the hydrology of the Petaluma Valley watershed. The GSP will set measurable thresholds and objectives for the following indicators: lowering groundwater levels, seawater intrusion, reduction of storage, land subsidence, degraded groundwater quality, and surface water depletion. City of Petaluma monitoring wells from DWR's California Statewide Groundwater Elevation Monitoring database were utilized to estimate initial condition groundwater elevation for the Petaluma Valley Integrated Hydrologic Model developed by USGS.

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

Modification of the Petaluma Valley Groundwater Basin boundary would promote sustainable groundwater management within the Petaluma Valley basin and bordering Wilson Grove Formation Highlands basin in accordance with the purposes of SGMA by avoiding the potential for inconsistent or conflicting groundwater management approaches that may result from dividing a single municipality, with local regulatory authority over land and water use within its entire boundaries, into separate groundwater basins and GSAs.

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

The Petaluma Valley groundwater basin is currently designated medium-priority. The City of Petaluma is a member of the Petaluma Valley GSA which formed in 2017 as a JPA. The Petaluma Valley GSA initiated the development of its Groundwater Sustainability Plan in 2018, with plan adoption set for the end of 2021. To assist in the development of the GSP, the City of Petaluma and Sonoma Water worked with USGS to characterize the hydrology of the Petaluma Valley watershed. The GSP will set measurable thresholds and objectives for the following indicators: Lowering groundwater levels, seawater intrusion, reduction of storage, land subsidence, degraded groundwater quality, and surface water depletion. City of Petaluma monitoring wells from DWR's California Statewide Groundwater Elevation Monitoring database were utilized to estimate initial condition groundwater elevation for the Petaluma Valley Integrated Hydrologic Model developed by USGS.

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.

Modification of the Petaluma Valley Groundwater Basin boundary would promote sustainable groundwater management within the Petaluma Valley basin and bordering Wilson Grove Formation Highlands basin in accordance with the purposes of SGMA by avoiding the potential for inconsistent or conflicting groundwater management approaches that may result from dividing a single municipality, with local regulatory authority over land and water use within its entire boundaries, into separate groundwater basins and GSAs. This request will not impact the current CASGEM monitoring wells within the basins or other water management and land use programs including GSP development.

H. Local Support

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

In-person meetings, teleconferences, and email communication with affected and interested agencies.

Attachment(s):

• 7-10-18 DRAFT AGENDA WGHF Meeting.docx (1.5MB) Uploaded on 09/14/2018 at 09:30AM
• 8-16-18 Wilson Grove BBM Meeting.docx (16kB) Uploaded on 09/14/2018 at 09:30AM
• F.3 Correspondence with Local Agencies.docx (18.8kB) Uploaded on 09/14/2018 at 09:30AM

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.

Attached are letters of support from County of Sonoma and Sonoma Water, County of Marin, and Petaluma Valley Groundwater Sustainability Agency.

Attachment(s):

• Marin County Letter of Support for Petaluma.pdf (284.1kB) Uploaded on 09/12/2018 at 10:52AM
• 8-28-18 COUNTY_SONOMA WATER support letter_city of Petaluma.pdf (138.1kB) Uploaded on 09/12/2018 at 10:53AM
• Basin Boundary Modification Request- City of Petaluma Wilson Grove.pdf (643.6kB) Uploaded on 09/25/2018 at 01:48PM

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

No opposition to the proposed boundary modification was received.

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.

The City of Petaluma requests that the Hydrogeologic Conceptual Model requirement be waived for this internal boundary modification. The USGS is developing the Petaluma Valley Integrated Hydrologic Model to simulate groundwater flow and estimate groundwater sustainability of the Petaluma Valley watershed. The City will provide this document to DWR upon release of the final hydrologic model. Furthermore, the requested boundary modification will not impact sustainable groundwater management in the affected groundwater basins.

Attachment(s):

• 2-1_Petaluma Valley_6-30-14 (002).pdf (45.6kB) Uploaded on 09/25/2018 at 02:07PM
• 1-59_Wilson Grove Formation Highlands_6-30-14.pdf (30.4kB) Uploaded on 09/25/2018 at 02:10PM

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):

• 1-59_Wilson Grove Formation Highlands_6-30-14.pdf (30.4kB) Uploaded on 09/25/2018 at 02:12PM
• 2-1_Petaluma Valley_6-30-14 (002).pdf (45.6kB) Uploaded on 09/25/2018 at 02:12PM

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

The Petaluma Valley GSA will be responsible for sustainable groundwater management in the expanded area of the basin that is currently within the Wilson Grove basin. The Petaluma Valley GSA is in the beginning stages of developing a Groundwater Sustainability Plan and is committed to incorporating this expanded portion of the basin into its GSP.