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' he results of the groundwater analysis to determine the concentra ions of nitrate (N) <br /> r in the water sampled from the on-site well indicated a concentration bf0.75 mg/I. This <br /> concentration is below the state drinking water standard of 10 mgA_PBCP,4vas <br /> not present in"tectable amounts. Copies of the test results and the chain-of-custody <br /> a e*re nfed on Plate 14. <br /> �We do not know of groundwater contamination issues at the project site at this time. <br /> No underground storage tanks are known to exist on the site and no gas stations or <br /> dairies are located adjacent to the site. The potential sources of nitrate in the project <br /> area include the grazing of cattle and horses: existing septic systems for single-family <br /> housing located in the project area: and any fertilizers, pesticides, and herbicides that <br /> may be used for agricultural purposes in the area. After the parcels are split. we <br /> anticipate that the on-site sources of nitrate will be limited to the use of pesticides on <br /> the planned vineyards on the parcels. <br /> 6. SOIL PROFILE <br /> The subsurface soil encountered in our soil profile borings consisted of sandy silt to <br /> sandy clay to a depth of approximately 2 to 9 feet below existing site grade underlain <br /> by discontinuous and interbedded layers of cemented clayey sand, gravelly sand_, and <br /> silty sand to sandy silt to the depths 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 project area as belonging to the Corning-Redding complex soil series (Map <br /> Symbol 135 and 136), Redding Gravelly Loam soil series (Map Symbol 220), and the <br /> Yellowlark Gravelly Loam soil series (Map Symbol 280). These soils are all described <br /> as being "well drained" and having "severe" percolation characteristics for septic tank <br /> absorption due to slow percolation and cemented hardpan. Other attributes are given <br /> in the table below! <br /> Map Available Water Organic <br /> Symbol Soil Name Capacity, pH Content, <br /> 1 inches/inch percent <br /> Co <br /> 135 'ng-Redding 0.04-0.14 4.5-7.3 0.5.2 <br /> -----Complex------------ <br /> 136 Corning-Redding 0.04-0.14 4.5-7.3 0.5-2 <br /> Complex <br /> 220 Redding Gravelly 0.04-0.14 5.1-6.5 <2 <br /> Loam <br /> 280 Yellowlark 0.04-0.17 5.1-6.5 <2 <br /> Gravelly Loam <br /> 57556.G011ST05R887R August 25,2005 <br /> ,, 2005 Kleinfoider, inn Page 3 of 5 <br />