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x <br /> 1.0 EXECUTIVE SUMMARY <br /> Diesel constituents were discovered in the soil at the Derickson Trucking compound, <br /> Escalon, California on October 1, 1992 during the removal of three underground <br /> storage tanks. Soil beneath two of the tanks were confirmed clean, however soil <br /> under the third, a 12,000 gallon capacity diesel tank, was impacted. A Site <br /> Characterization conducted by AquaGeosciences Inc. (AGI) delineated an impacted <br /> area approximately 550 square feet of impacted soil at the northern ends of the former <br /> tanks. Hydrocarbons were detected to a depth of at least 30 feet. The highest <br /> concentrations reported for benzene and Total Petroleum Hydrocarbons (TPH) as <br /> diesel were 7.9 and 4100 ppm, respectively. <br /> Due to the proximity of the contaminated mass to the groundwater table <br /> (approximately at 90 feet below the surface and historically as high as 50 feet), <br /> remedial action was recommended. <br /> This report documents the excavation of the contaminated soil and its subsequent <br /> bioremediation on the east side of the property in a bermed treatment cell. Chemical <br /> analysis of soil samples collected from the walls and base of the excavation confirm <br /> the removal of all diesel hydrocarbon impacted soils at the site. Bioremediation of <br /> excavated soil is in progress. <br /> f r 2.0 BACKGROUND <br /> The Derickson Trucking site is located at 315 15658 S. Escalon Bellotti Road in <br /> Escalon; California (Exhibit 1). The property is owned by- Mr. Dave Derickson of <br /> Escalon, California and the property is leased to Mid-Valley Agriculture. <br /> 2.1 Facility Description - <br /> Derickson Trucking is located off of Escalon Bellota Road, approximately 20 miles <br /> north of Modesto and 3 miles north of- Escalon. The-facility consists of 2 large <br /> warehouses which lie side by side and a trucking scale which lies along the south side <br /> of these buildings. The rest of the site is a paved and graveled parking lot which is <br /> presently being used by Mid-Valley Agriculture to store mobile and stationary fertilizer <br /> tanks. Three underground storage tanks (USTs) were formerly located on the property. <br /> One 2",000 gallon gasoline tank and a 12,000 gallon diesel tank and associated <br /> dispenser existed in the front on the the west side of the property .near S. Escalon <br /> Bellota Road. A 2,000 gallon waste oil tank existed on the east side of the. north <br /> warehouse. The former dispenser .island was situated north of-the tank location. A <br /> plot plan of the property is provided on. Exhibit 2. - <br /> i <br /> `2 of 7 <br />