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_ August 15,2003 <br /> Job Number: LG03-221 <br /> Page 6 <br /> (3 mg/L-N). Areas having 24.75 mg/L NO3 (5.5 mg/L-N) or more are those in which nitrate <br /> concentrations may be increasing(Hull, 1984). <br /> DBCP was not detected in the water sample. DBCP is a nematocide and soil fumigant for <br /> vegetables, and grapes. It is thought to cause health problems consisting of kidney damage, liver <br /> damage, and cancer. The use of DBCP was discontinued in 1979. The Environmental Protection <br /> Agency(EPA) set the maximum contaminate limit (MCL)at 0.2 parts per billion(ppb) because <br /> the EPA believes that given present technology and resources, this is the lowest level to which <br /> water systems can reasonably be required to remove this contaminate should it occur in drinking <br /> water. <br /> 6.0 GEOLOGY, SOILS,AND PERCOLATION TEST <br /> According to the San Joaquin County Soil Survey, the surface soil located at the site is Acampo <br /> sandy loam (no. 10 1) which is "moderately well drained, and nearly level soil is on low fan <br /> terraces. It is deep to a hardpan. It formed in alluvium derived from granitic rock sources. <br /> Permeability is moderately rapid." (Plate 7) The following table presents a summary of selected <br /> properties of the Acampo sandy loam soil. <br /> Table 3. <br /> Selected Soil Properties of the Acampo Sandy Loam Soil, <br /> San Joaquin County Soil Survey Report.6 <br /> Soil Name and Map Depth(in) Unified Soil Salinity Soil Septic tank <br /> Symbol Classification mmhos/cm Reaction absorption <br /> pH fields <br /> Acampo sandy loam, 0-19:Sandy loam SM <2 6.1 -7.8 Moderate: <br /> 0 to 2 percent slopes, 19-47: Sandy loam, SM <2 6.6-8.4 cemented pan. <br /> 101. fine sandy loam,coarse <br /> sandy loam. --- --- --- <br /> 47-49:Indurated --- --- --- <br /> 49-60: Cemented <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> One (1)3-foot deep soil boring was drilled on the proposed parcel to characterize the shallow <br /> subsurface conditions. The soil encountered to a depth of 3.0 feet on the site was composed of <br /> light brown silty fine to medium sand, similar to the descriptions of the shallow soil in the San <br /> Joaquin Soil Survey. One shallow percolation test was completed within the 3-foot deep boring <br /> :pE RSO <br /> � 1 <br /> O / <br /> 1SS O C� <br />