The Graton Resort and Casino (Resort) uses groundwater from two on-site wells. The higher groundwater pumping rates assumed in the EIS (i.e., the pumping rates associated with the Resort prior to downsizing) have been reduced to address groundwater concerns. The Intergovernmental Mitigation Agreement between the Tribe and the County of Sonoma provides, among other things, that the Tribe will fund a conjunctive use program to further address groundwater concerns.

The Tribe has also agreed to implement a program to compensate neighboring well owners for impacts to well operation based on interference drawdown caused by Resort pumping. Key elements of this program, which is described in more detail in the ROD, are as follows:

  • The Tribe will reimburse the owners of wells that become unusable within three years of the onset of Project pumping for a portion of the prevailing, customary cost for well replacement, rehabilitation or deepening. In order to be eligible, the well owner must provide the Tribe with documentation of the well location and construction (diameter, depth, screened interval, pump type, etc.), and that the well was constructed and usable before Project pumping was initiated.
  • The Tribe will reimburse the owners of wells with pumps that require lowering within three years of the onset of Project pumping for a portion of the prevailing, customary cost for this service. In order to be eligible, the well owner must provide the Tribe with documentation of the well location and construction, including pump intake depth, and that the well was constructed and usable before Project pumping was initiated.
  • The Tribe will reimburse well owners pumping more than 100 acre-feet/year for their additional annual electrical costs at the prevailing electrical rate. In order to qualify for reimbursement, the well owner must provide proof of the actual annual volume of water pumped and/or the electrical usage associated with the pumping.

Well owners within 2 miles of the Resort may complete a Claim Form if they believe their well has been impacted.