City of Petaluma - 1-059 WILSON GROVE FORMATION HIGHLANDS, 2-001 PETALUMA VALLEY

City of Petaluma - 1-059 WILSON GROVE FORMATION HIGHLANDS, 2-001 PETALUMA VALLEY

A. Applicant Information

Requesting Agency Information
Agency Name: City of Petaluma
Address: 3890 Cypress Drive
City: Petaluma Zip: 94954
Work Phone: (707) 776-3777 Cell Phone:
Email: lwalker@ci.petaluma.ca.us Fax:
Revision Request Manager Information
Person Name: Chelsea Thompson
Address: 3890 Cypress Drive
City: Petaluma Zip: 94954
Work Phone: 7077763728 Cell Phone:
Email: cthompson@ci.petaluma.ca.us Fax:
 

B. Description of Proposed Boundary Modification

  1. 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.
    • Jurisdiction Internal
  2. 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.
    • 1-059 WILSON GROVE FORMATION HIGHLANDS
    • 2-001 PETALUMA VALLEY

C. Initial Notification and Combination of Requests

  1. Yes
    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. No

D. Required Documents for All Modifications

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

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.

F. Notice and Consultation

Petaluma Valley Groundwater Sustainability Agency, County of Sonoma, Sonoma Water, and County of Marin.
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.
In-person meetings, teleconferences, and email communication with affected and interested agencies.
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.
Attached are letters of support from County of Sonoma and Sonoma Water, County of Marin, and Petaluma Valley Groundwater Sustainability Agency.

G. General Existing Groundwater Management

All requests for jurisdictional modification pursuant to Section 342.4 MUST include responses to the following questions.
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.
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.
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.
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

All requests for boundary modification must include the following:
In-person meetings, teleconferences, and email communication with affected and interested agencies.
Attached are letters of support from County of Sonoma and Sonoma Water, County of Marin, and Petaluma Valley Groundwater Sustainability Agency.
No opposition to the proposed boundary modification was received.

I. Hydrogeologic Conceptual Model

Requests for boundary modification, must include a document or text to a clearly defined hydrogeologic conceptual model demonstrating each of the following:
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.

L. Technical Studies for All Jurisdictional Modifications

Requests for a jurisdictional boundary must attach or provide a URL or upload a file for the following:
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.
Created on 08/24/2018 at 2:10PM, last modified on 11/20/2018 at 10:04AM and page generated on 07/16/2019 at 3:03AM