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Site Background Information <br /> SHOCKEY AND SONS TRUCKING <br /> 850 Milgeo Avenue, Ripon, California <br /> The site is located on the west side of Milgeo Avenue at the intersection with Wilma Road, <br /> adjacent to Highway 99. The site is further described as being located in the southeast quarter of <br /> Section 19, Township 2 South , Range 8 East, Mount Diablo Base and Meridian (Manteca <br /> Quadrangle, 7.5-Minute USGS Topographic Series, 1968, photo revised 1987). Historic soil <br /> analytical data is included at the end of this appendix. <br /> SITE DESCRIPTION <br /> A former truck fueling system operated on the site for approximately 30 years. The property is <br /> zoned as industrial and is presently utilized by a swimming pool construction company to <br /> construct faux rocks and as a staging area for fill material for residential swimming pool <br /> construction and landscaping. Local land use in the immediate vicinity of the site is agricultural <br /> and industrial; residential areas are located northeast, east and south of the site. The site consists <br /> of two wood-frame warehouse building structures and an asphalt paved and rock-covered vehicle <br /> parking and storage area. <br /> UNDERGROUND STORAGE TANK REMOVAL <br /> It is our understanding that six USTs were removed from three separate excavations on the <br /> property in April 1994: one waste oil UST, one diesel UST and four unleaded gasoline USTs. <br /> Petroleum hydrocarbons were detected in soil samples collected from beneath the USTs at the <br /> time of removal. Soil excavated during the UST removal was used to backfill each excavation. <br /> Clean soil was imported to "cap" each excavation. <br /> SITE ASSESSMENT <br /> The following is a brief summary of site assessment activities: <br /> • In December 1995,AGE advanced five soil probe borings at the site. Total Petroleum <br /> Hydrocarbons quantified as diesel (TPH-d)was reported in 9 of 11 soil samples collected <br /> from probe borings P 1, P3, P4 and PS at depths ranging from 15 feet below surface grade <br /> (bsg) to 25 feet bsg at a maximum concentration of 5,100 milligram per kilogram <br /> (mg/kg) in sample P1-25. Historic soil analytical data is included at the end of this <br /> appendix. <br /> • <br /> In June 1996, AGE installed four ground water monitoring wells. TPH quantified as <br /> Advanced GeoEnvironmental,Inc. <br />