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^ - — ��� KLE { NOEL © ER <br /> .� EXPECT MORE' <br /> ' The results of the groundwater analysis to determine the concentratio of nitr to (N) <br /> int ter sampled from the on-site well indicated a concentration 10 mgl . This <br /> rate co centration is equal to the state drinking water standard of� mgl . DBCP <br /> as'not pr sent in detectable amounts with a reporting limit of 0.01 µ ll 644 s of the <br /> est result and the chain-of-custody are presented on Plate 8. <br /> We o not know of any existing and/or potential groundwater contamination issues in <br /> the project vicinity. There are no existing gas stations or dairies adjacent to the <br /> property. Seasonal fertilization of the off-site nearby agricultural land, if performed, <br /> and other septic tank/leach field systems in the project area are probably the largest <br /> contributors of nitrogen to groundwater in the project vicinity. <br /> 7. SOIL PROFILE <br /> The subsurface soil e countered in our soil profile_boryng consisted of brown to light <br /> brown, silty to sandy clay to a depth of approximatbly 7 feet below site grade, followed <br /> by sandy silt to silty sand to the depth explored. U <br /> The Soil Survey of San Joaquin County, California published by the U.S. Department <br /> t" of Agriculture, Soil ConservationnSei1992) refers to the near-surface soil within <br /> the area of the project as belonCapay Clay soil series (Map Symbol 118).XThis soil is described as havin percolation characteristics for septic tank <br /> absorption. Other attributes aree table below: <br /> i <br /> Available Water <br /> nic <br /> Symbol Soil Name Capacity, PH Content, percent / <br /> inches/inch <br /> 118 Capay Clay 0.14 - 0.16 6.6 — 8.4 1 - 2 <br /> 8. PERCOLATION TESTING <br /> The results of our percolation tests are presented below. A copy of our field <br /> percolation test results are attached. <br /> 4 Test Soil Test Hole Percolation Rate SJCEHD <br /> Number Description Depth ft. m' ch Observed <br /> P-1 Sandy Clay ,�6'/' Yes <br /> P-2 Sandy Clay / 3'/2 er Yes <br /> 7831 1.G01IST07R193 March 5,2007 <br /> c)2007 Kleinfelder,Inc. Page 4 of 8 <br />