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�. November 17,2005 <br /> NOA Project Number: E05152-A <br /> Table 2. <br /> Vicinity Septic Re air Permit ummary. <br /> Address,Date Tank Capacity Comment <br /> 251 S.Hewitt Rd.,3/3/89 1,600 gal Install 1,600 gal P&L tank <br /> 3.7 Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected usage on each proposed parcel would be for a primary residence and second <br /> dwelling unit. Septic system design should be based on the On-Site Wastewater Disposal Standards or <br /> other engineering recommendations. <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 (1998 and 1999) ground <br /> water depth and elevation maps were reviewed to determine the ground water levels near the Site. <br /> The Fall 1998 and Spring 1999 maps are the most current official maps available from the County. /� J <br /> I According to these maps (Plates 3-6),ground water lies between 133 and 139 feet below ground <br /> 6., surface. Ground water flows at a gradient ranges between three to five feet per mile to the west- <br /> southwest in the vicinity of the Site for both maps. <br /> `. No ground water was encountered by the staff of Neil O.Anderson&Associates,Inc. during the <br /> drilling of eight percolation test holes to depths between three and 25 feet on June 22, 2005. C�•3� <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 /> Lsoil 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. Agricultural activities and the use of septic systems in the area should <br /> Lbe considered potential ground-water contamination sources. <br /> 4.3 Well Permit History and Water Sample Location <br /> L <br /> One domestic water well exists on the Site. One new well permit was found for the Site during file <br /> review at EHD on November 7, 2005. The permit, dated 1976,was for the construction of a new <br /> domestic well. The second permit,dated 1991,was for pump replacement at the same well. These <br /> permits have been included in the appendix of this report. <br /> ` A water sample was taken from the domestic well head spigot at the water well by Steve O'Blia of ( •�✓) <br /> 4 <br />