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it • California Regional Water Quality?ontrol Board " : (�\ Central Valley Region l Robert Schneider,Chair Arnold Schwaaenegger Terry Tamminen Secreiaryfor Sacramento Main Office Governor Environmental Protection Internet Address: http://wvnv.smeb.ca.gov/—mgcb5 11020 Sun Center Drive,#200,Rancho Cordova,CA 95670-6114 Phone(916)464-3291 •FAX(916)464-4780 ^ll�ll 111111E^-JE n�E D 19 April 2004 AP`R2 0 2004 ENVIRONMENT HEALTH Lynn Sutton Erik Teed-Bose PERMIT/SERVICES Mountain House CSD Trimark Communities Courthouse, Room 678 3120 Tracy Boulevard, Suite A 222 East Weber Avenue Tracy, CA 95376 Stockton, CA 95202-2778 INCOMPLETE REPORT,ADDITIONAL GROUNDWATER AND AGRICULTURAL DRAIN MONITORING WORKPLAN, MOUNTAINHOUSE TRIMARK COMMUNITY, SANJOAQUIN COUNTY I have reviewed the 12 March 2004 Additional Groundwater and Agricultural Drain Monitoring Workplan prepared by Condor Earth Technologies, Inc. and found it to be incomplete. Therefore, Mountain House Trimark Community(Discharger) shall resubmit the report. The revised report shall address the following items: 1. Future submittals shall include names for all proposed wells, agricultural drain sampling locations, land application areas, wastewater ponds, and soil sampling locations. Failing to identify each feature makes specific comments on the workplan more difficult. 2. The proposed well locations shown on Figure 1 may not be adequate to characterize groundwater quality both upgradient and downgradient of the Proposed Reclamation Field. Staff notes that three of the proposed wells are located adjacent to Old River and may be too close to the river to allow characterization of groundwater flowing toward the river from the Proposed Reclamation Field. The revised report shall include an evaluation of the groundwater flow conditions in the existing land application area (located southeast of the Proposed Reclamation Field) to determine groundwater flow directions. The proposed wells shall be located based on that information. 3. Workplan Section 4.2 describes the proposed pond monitoring well as upgradient of the wastewater storage ponds. Based on site topography and surface water location, that interpretation seems unlikely. In order to design an effective groundwater monitoring network, the Discharger must develop a conceptual understanding of the groundwater conditions at the site. New well locations shall be proposed based on the available groundwater information. The revised report shall include information on the groundwater flow directions, including groundwater elevation maps to support the proposed location of fixture monitoring wells. 4. Staff notes that the groundwater monitoring network for the existing ponds is inadequate. The workplan shall be revised to add a sufficient number of groundwater monitoring wells to adequately characterize the groundwater quality for all ponds, including the existing ponds. California Environmental Protection Agency Co Recycled Paper