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.,.i <br /> 4. DOMESTIC WELL ANALYSIS <br /> The well at 19292 E. Gawne Road was sampled February 21, <br /> 1997, with the samples being taken to FGL Environmental for <br /> analysis. The wellhead seal was intact. <br /> The required tests were for DBCP and Nitrates. <br /> Labratory results showed the following: DBCP not detected, <br /> Nitrate 29 ppm. <br /> While the reported Nitrate level was below the USEPA MCL <br /> of 45 ppm(mg/L) further investigation may be in order to determine <br /> whether reported levels are increasing or decreasing due to <br /> the changing usage of the locality from agriculture to residential. <br /> A decrease in reported levels would indicate that contamination <br /> was due to the use of, and subsequent investiture into the water <br /> supply of nitrogen based fertilizers. An increase would indicate <br /> that the recent addition of residential septic systems is approaching <br /> the maximum capability of the indigenous soil to support adequate <br /> septic absorbtion. <br /> Such studies are beyond the scope of this report. <br /> Based on San Joaquin County Flood Control and Water Conservation Dist. <br /> Spring 1991 report the water table is 125 feet below the ground surface. <br /> 5. SOIL CLASSIFICATION <br /> Native soil in the study area has been defined as Landlow <br /> Adobe Clay (Calif. Soil Survey, Division of Soils, U.C. Berkeley; <br /> Soils of San Joaquin County ) or Hollenbeck Silty Clay (USDA; <br /> Soil survey of San Joaquin County California) in either classification <br /> typified as a layer of sedimentary origin with subsequent modification <br /> due to glaciation. <br /> The soil is capable of only moderate water capacity with <br /> a typical percolation rate of 0.1 inch per hour. This makes <br /> it ideal for row crops and allows a minimum of treatment to <br /> be performed for the purpose of foundation support of residences. <br /> Drilling logs for the well onsite and adjacent to the site <br /> were unavailable so no profile information is available save <br /> observable continuity of the top strata to a depth of at least <br /> six feet. Further data should be available during construction <br /> of domestic wells and septic systems. <br />