Laserfiche WebLink
kn KLEINFELDER <br /> 2 BACKGROUND <br /> The Weston Ranch Property consists of 15 parcels encompassing approximately 1,454 <br /> acres. It is located approximately 4.5 miles south of central Stockton, San Joaquin County, <br /> California (Plate 1, Appendix A). The property is located in T1N, R6E, in portions of <br /> Sections 21, 22, 23, 26, 27, 28, 33, and 34 of the Stockton West 7.5 minute Quadrangle, <br /> United States Geological Survey. <br /> Kleinfelder performed a preacquisition site assessment and soil sampling investigation in <br /> June, 1988. The sampling events targeted areas of obvious petroleum hydrocarbon stained <br /> soil (HS areas), oiled roads, and suspected pesticide container disposal areas (PS areas). <br /> Soil samples were collected to a maximum depth of 5 feet with a hand auger and submitted <br /> for laboratory analyses. Analytical results indicated total petroleum hydrocarbons (TPH) <br /> were present at 27 to 5,600 mg/kg in soil samples from five stained areas, HS-1, HS-2, HS- <br /> 3, HS-4, and HS-5. HS-1, HS-2, and HS-4 had the highest detected TPH hydrocarbon <br /> concentrations of 5,600 mg/kg and 1,100 mg/kg, respectively. Endosulfan I, endosulfan II, <br /> endosulfan sulfate, DDT, eptam and diuron were detected in soil samples from PS-3; one <br /> of the three pesticide sample areas. The results of this investigation were presented in <br /> Kleinfelder's Preacquisition Appendix Report dated June 29, 1988. <br /> Based on the analytical results, Kleinfelder proposed a scope of work to further assess the <br /> vertical and lateral extent of petroleum hydrocarbon contamination in the unsaturated soil <br /> at areas HS-1 and HS-4, and pesticide contamination at area PS-3. In addition, Kleinfelder <br /> proposed the installation of three ground water monitoring wells to assess the first <br /> encountered ground water at HS-1, HS-2, and HS-4; the HS areas with the highest detected <br /> TPH concentrations. The scope of work was presented in proposal dated August 15, 1988. <br /> This scope of work was approved by Resource Development and the San Joaquin Local <br /> Health District in September 1988. <br /> This report describes the field observations, activities, and analytical results for the soil and <br /> ground water assessment conducted by Kleinfelder in November 1988. <br /> 161-89-107 3 <br />