GSP Amendments

After a lengthy review period, the Subbasin received a Consultation Initiation Letter (CIL) on January 21, 2022, from the California Department of Water Resources (DWR). All GSPs within the Delta-Mendota subbasin were rejected. 

The CIL identified four potential deficiencies across the six Subbasin GSPs which may preclude DWR’s approval, as well as potential corrective actions to address each potential deficiency. The CIL thus initiated consultation between DWR, the Basin Manager, Plan Managers, and the Subbasin’s GSAs. The attached Common Chapter has been revised to incorporate changes required to reflect the Subbasin’s response to the deficiencies identified in the CIL, based on direction provided by the Coordination Committee (Coordination Committee), the Delta-Mendota Technical Working Group (Technical Working Group), the Subbasin GSAs and DWR. This revised Common Chapter, along with the cover letter, are intended to document how the deficiencies identified in the CIL were addressed in the revised Subbasin GSPs and this revised Common Chapter. The four deficiencies identified in DWR’s CIL are summarized below:

  •  Potential Deficiency 1: The GSPs do not use the same data and methodologies.
  •  Potential Deficiency 2: The GSPs have not established common definitions of undesirable results in the Subbasin.
  •  Potential Deficiency 3: The GSPs in the Subbasin have not set sustainable management criteria in accordance with GSP regulations.
  •  Potential Deficiency 4: The management areas established in the Plan have not sufficiently addressed the requirements specified in 23 CCR §354.20.

Each deficiency has been addressed in the common chapter and in the supporting documents for the Northern & Central GSP. A hard copy of the amended Public Draft of the Northern & Central Delta-Mendota Region Groundwater Sustainability Plan may be reviewed at the Stanislaus County Department of Environmental Resources, Groundwater Division, located at 3800 Cornucopia Way, Suite C, in Modesto. All documents pertaining to the Northern & Central Delta-Mendota Groundwater Sustainability Plan may also be found at the following electronic addresses:

Supporting Documents:

DWR Consultation Initiation Letter (CIL)                                                                                                                                                   90-Day Notice to Cities and Counties                                                                                                                                                     Legal Notice-Public Hearing                                                                                                                                                                      DM Northern Central Revised GSP-Clean Version                                                                                                                                   DM Northern Central Revised GSP-Redline Version