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APPENDIX BIRISK BASED CO_RRECTWE ACTION TIER I AND TIER 2 ANALYSIS, SITE CLOSUREEVALUATION REPORT Former Beacon Station No 695 900 South Cherokee Lane Lodi, Caldomia Delta Project No D093-915 Page 4 direction established from quarterly monitoring events is generally south and is consistent with the regional ground water flow direction Due to the limited thickness of the Victor Formation, most ground water supply wells penetrate it and extract water from deeper formations During the period of 1985 to the present, ground water elevations have steadily decreased (Table 1) This decrease is due to ground water pumping for agricultural activities and domestic use The importation of water has largely replaced the ground water pumping in the western portion of the valley The maim source of recharge to the water table is infiltration and percolation of imported surface water applied to irrigated lands. Recharge was formerly supplied primarily by streams and rivers entering the valley Most aquifer discharge, previously occurring as evapotranspiration and seepage to streams, is now from pumping wells (Johnson, 1989) The current interrelationships of topography, pumping, and artificial recharge can cause local ground water flow to be complicated and difficult to predict Presently there are no plans to enhance aquifer recharge to the area of the site (personal communication with DWR) 2.5 Local Water Supply The City of Lodi (City) Public Works Department, Water/Wastewater Division is the major supplier of public water for the City Ground water is the mayor source of public water Most of the water supply wells draw ground water from either deep portions of the Victor Formation or from the underlying Laguna Formation at depths from 150 to 460 feet According to the City Water/Wastewater Division, the nearest municipal water supply well is City Well No. 6R, which is located approximately 2,600 feet southwest of the subject property, at the southeast corner of Mission Avenue and Stockton Street (Figure 4) City of Lodi Well No 6R is installed to a total depth of 505 feet below surface grade (bsg), and is screened between 170 and 440 feet bsg The well is capable of producmg approximately 3,000 gallons per minute with 20 feet of drawdown. A phone call to Mr Frank Blewer at the City of Lodi Public Works Department on October 14, 1996, by Delta personnel inquired as to plans to drill and complete future water supply wells Mr. Blewer stated that no wells are planned through the year 2005 RPT001 915