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�. KLEINFELDER <br /> DBCP was not present in detectable amounts. This nitrate concentration is below the ( <br /> state drinking water standard. Copies of the test results and the chain-of-custody are <br /> r <br /> presented on Plate 9. <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 dairies 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 is probably the largest contributor of <br /> nitrogen to groundwater in the project vicinity. <br /> 7. SOIL PROFILE <br /> The subsurface soil encountered in our soil profile boring consisted of low-plastic clay <br /> to a depth of less than 1 foot below site grade, followed silty sand to a depth of about 4 <br /> feet. The sand was underlain by low- to non-plastic sandy silt to a depth of about 7 <br /> feet, followed by highly-interbedded strata of clayey sand, silty sand, and clayey silt to <br /> (/ /) the depth explored. <br /> ` r <br /> �J <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 project area as belonging to the Acampo Sandy Loam soil series (Map Symbol <br /> 101). This soil is described as having "moderate" percolation characteristics for septic r5 <br /> tank absorption. Other attributes are given in the table below: <br /> Map Soil Name Available Water PH Organic <br /> S mbolCapacity, inches/inch I I Content, percent <br /> 101 Acampo Sandy Loam 0.10 - 0.14 6.6 - 8.4 1-3 <br /> 8. PERCOLATION TESTING <br /> The results of our percolation tests are presented below. A copy of our field <br /> percolation test results is attached. <br /> Test Soil Test Hole Percolation SJCEHD <br /> Number Description Depth ft. Rate min./inch Approved <br /> P-1 Sandy Silt 4'/z 11 .9 Yes <br /> P-2 Silty Sand 10 20.8 No <br /> P-3 Silty Sand 15 5.4 Yes <br /> We note that a percolation test was not performed in the silty sand at a depth of 3'/z- <br /> feet as required by SJCEHD. Since lower permeable sandy silt was located within <br /> a o6 uFfi inc�Fies of the silty sand layer, it is our professional opinion that the sit layer will <br /> 59149.G01/ST05R1062 August 30,2005 <br /> Copyright 2005 Kleinfelder, Inc. Page 4 of 7 <br />