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November 23, 2004 <br /> NOA Project Number: E04140A <br /> 4.0 GROUND WATER INFORMATION <br /> 4.1 Ground Water Depth and Gradient <br /> ` The San Joaquin County Flood Control and Water Conservation District ground-water depth and <br /> elevation maps were reviewed to determine the ground water levels near the site. The Fall 1998 and <br /> Spring 1999 maps are the most recent maps available from the County. <br /> The depth to ground water below the site during the period of Fall 1998 and Spring 1999 ranged <br /> between 17 and 18 feet. The gradient and flow direction was south to southwest at 10 feet/mile- <br /> 4.2 On Site Well Permit History <br /> Two (2)well repair permits were found during file review at EHD. These permits were to repair <br /> pump motors in the wells. The permit copies are attached in the appendix. <br /> A3—— 4.3 Potential Ground Water Contamination Issues <br /> Identifying potential ground-water contamination sources was not part of the scope of work for the <br /> soil suitability study. Potential ground-water contamination can occur from a number of sources <br /> which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, <br /> and storm water infiltration. Any past agricultural activities and the present use of septic systems in <br /> the area should be considered potential ground-water contamination sources. <br /> Mr. Mike Huggins, supervising environmental health specialist R.E.H.S. of EHD,indicated to our <br /> office that some ground water zones below Lodi within the vineyard areas have relatively high <br /> concentrations of Dibromochloropropane (DBCP). <br /> 4.4 Water Sample Location <br /> The water sample location was at the well head which serves the winery (east well). <br /> [ 4.5 Water Sample Constituents <br /> ` The water sample was analyzed for nitrate (as NO3) and Dibromochloropropane (DBCP). Nitrate <br /> was found at 3.0 mg/L-NO3i well below the maximum contaminant level (MCL) set by the US EPA <br /> of 45 mg/L-NO3. DBCP was not detected in the water sample. The analytical reports, and a chain <br /> ` of custody prepared by Precision Enviro-Tech, can be found in the appendix of this report. <br /> 5 <br />