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. "„ Foos/oza <br /> ' The results of the groundwater analysis to determine the concentrations of nitrate (N) <br /> in the water sampled from the on-site well indicated a' concentration of 14 rng/i. This nitrate concentration is not below the state drinking water standard of 10 mg/i. DRIP <br /> was r•.ct present in detectable amounts. Copies of the test results and the chain-of- <br /> cuszody are presented on Plate 8. <br /> ' We do not know of any existing and/or potential groundwater contamination issues in <br /> the project vicinity. There are no existing gas stations or clairies adjacent to the <br /> ' property. Seasonal fertilization of the off-site agricultural land, if performed, and other <br /> septic tank/leach field systems in the project area are probably the largest contributor <br /> of nitrogen to groundwater in the project vicinity. <br /> t7. SOIL PROFILE <br /> ' The subsurface soil encountered in our soil profile boring consisted of brown, fine <br /> grained silty sand to a depth of approximately 6 feet below site grade, followed by fine <br /> grained relatively "clean' sand to a depth of about 12% feet. The sand was underlain <br /> ' by sandy silt to a depth of about 131/2 feet, followed by a strata of silty clay to the depth <br /> explored. <br /> ' The Soil Survey of San Joaquin County, California published by the U.S. Department <br /> of Agriculture, Soil Conservation Service (1992) refers to the near-surface soil within <br /> the western area of the project as belonging to the Sisgani Loamy Coarse Sand soil <br /> ' series (Map Symbol 109) and the soil within the eastern area of the project as <br /> belonging to the Tinnin Loamy Coarse Sand soil series (Map Symbol 255). -'his soil is <br /> described as having "moderate' percolation characteristics for septic tank, absorption. <br /> ' Other attributes are given in the table below: <br /> Available Water <br /> Mn�bal ap ! Soil Name Capacity, FH Organic <br /> ' Y I G"onten_t, percent <br /> inchesfinch <br /> 10S Bisgani Loamy i 0.06-0.08 7.4-8.4 1-3 <br /> Coarse Sand <br /> 255 I T Innen Loamy I <br /> Coarse Sand i 0.05-0.07 6.i-7.8 1 2 <br /> ' S. PERCOLATION TEST114G <br /> ' The result of our parcolation test is presented below. A copy of our field percolation <br /> test result is attached. <br /> Test Soil 1 Test Hole Percolation RafeJCEHID <br /> umbsr DescriFtion� D_e��. minJinl I Ap roved _ <br /> F'-1 Silty Sand Yes <br /> 7132f.GOVST0611759 July 13,2006 <br /> COpytignl 2006 Kl;.W V&r.Int. Faq.'4 of 9 <br /> 1 <br />