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L <br /> LNovember 3,2004 <br /> NOA Project Number: E040118A <br /> f 3.7 Expected On-Site Maximum Septic Tank Usage <br /> V <br /> Maximum expected usage on each proposed parcel would be for any of the existing facilities in <br /> addition to a new primary residence and a new second dwelling unit. If any other buildings in <br /> addition to the primary residence and second dwelling unit were proposed (such as a labor camp), <br /> the EHD may require additional studies. The proposed septic systems should be based on the On- <br /> Site Wastewater Disposal Standards or other engineering recommendations discussed in this report. <br /> 4.0 GROUND WATER INFORMATION <br /> 4.1 Ground Water Depth and Gradient <br /> it The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground <br /> water depth and elevation maps were reviewed to determine the ground water levels near the Site. <br /> LThe ground water contours in the area of the Site are not drawn on the ground water map. <br /> Ground water was found to exist between approximately four (4) feet below the ground surface <br /> several ground water borings excavated adjacent to percolation test borings on the site. We noticed <br /> that the water level fluctuates in ditches due to island pumping and tidal fluctuations. <br /> r <br /> 4.2 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. A Surface and Subsurface Contamination Report addressed this issue (NOA, <br /> 2004). Please refer to this report for descriptions. <br /> In general,potential ground-water contamination can occur from a number of sources which often <br /> include leaky underground storage tanks, agricultural activities, dairies, septic systems, and storm <br /> water infiltration. Any past agricultural activities and the present use of agriculture and septic <br /> systems in the area should be considered potential ground-water contamination sources. <br /> 4.3 Water Sample Location r '] <br /> LA groundwater sample was collected for this report on October 29,2004. It was taken at two water L '3J <br /> well locations noted on the Site Plan (Plate 1). <br /> u <br /> 4.4 Water Sample Constituents <br /> LThe water sample was analyzed for nitrate and DBCP. Nitrate was found at Non Detectable (ND) <br /> Levels at location DRS-1 and 6.9 mg/L-NO3 at location DRS-2 which is below the maximum <br /> contaminant level (MCL) set by the US EPA of 45 mg/L-NO3. DBCP was ND in both ground <br /> Lwater samples. The analytical reports prepared by Precision Enviro-Tech can be found in the <br /> L 4 <br /> '-'44V <br />