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k`■ KLEINFELDER <br /> 1 EXECUTIVE SUMMARY <br /> Kleinfelder was contracted to conduct a second phase soil and ground water assessment of <br /> the Weston Ranch parcels in Stockton, California. Residential development is proposed <br /> for the site. This report presents the field and analytical results of the soil and ground <br /> water samples collected from three hydrocarbon stained areas and the soil samples <br /> collected from a pesticide area. <br /> In June 1988, a preacquisition site assessment and preliminary soil sampling investigation <br /> was conducted by Kleinfelder at the 1,454-acre tract of land. Three areas of potential <br /> petroleum hydrocarbon contamination and one area of potential pesticide contamination <br /> were indicated in the assessment. <br /> In the second phase investigation, ground water monitoring wells were installed through <br /> the center of three areas with obvious petroleum hydrocarbon surface staining. Soil and <br /> ground water samples collected in the vicinity of the hydrocarbon stained areas indicate the <br /> surface stains have not had an adverse impact on the shallow ground water. Kleinfelder <br /> recommends the excavation of the stained soil and proper abandonment of the wells. No <br /> further assessment of the hydrocarbon-stained areas is warranted at this time. <br /> Low concentrations of pesticides were detected in soil samples collected from an area <br /> where empty pesticide containers were discarded. Organochlorine pesticides were <br /> detected in surface and subsurface samples, but the concentrations of detected <br /> organochlorine pesticides are significantly lower than the specified Total Threshold Limit <br /> Concentrations for designation as a hazardous waste. Low concentrations of carbamate <br /> pesticides were detected in the surface samples only. There are no specified levels for <br /> designation as a hazardous waste for carbamate and urea pesticides, and endosulfan I, <br /> endosulfan II, and endosulfan sulfate. <br /> Since residential development is proposed for the site, Kleinfelder recommends Resource <br /> Development conduct a risk assessment if the soil is to be left in place or excavate the soil <br /> in the pesticide container disposal area. The detected pesticides with no specified <br /> concentrations for designation as a hazardous waste were not detected at a depth of 2.5 <br /> feet. In the area of the pesticide container disposal area, the empty containers and top 2.5 <br /> 161-89-107 1 <br />