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SHOCKEY AND SONS TRUCKING <br /> 850 Milgeo Avenue, Ripon, California <br /> HISTORICAL BACKGROUND <br /> The site is located on west side of Milgeo Avenue at the intersection Wilma Road, adjacent to <br /> ' Highway 99 The property is zoned industrial and is presently utilized as a distribution warehouse <br /> Local land use in the immediate vicinity of the site is agricultural and industrial,residential areas are <br /> located south of the site 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) <br /> SITE DESCRIPTION <br /> A former truck fueling system operated on the site for approximately 30 years Currently a pool <br /> construction company operates a materials staging warehouse on the site The site consists of two <br /> ' wood-frame warehouse building structure and an asphalt-paved and rock covered vehicle storage <br /> area Local land use in the immediate vicinity of the site is agricultural and industrial, residential <br /> areas are located south of the site <br /> UNDERGROUND STORAGE TANK REMOVAL <br /> lie It is our understanding that six USTs were removed from three separated excavations on the property <br /> in April 1994 one waste oil UST, one diesel UST and four unleaded gasoline USTs Petroleum <br /> ' hydrocarbons were detected in soil samples collected from beneath the USTs at the time of removal <br /> Soil excavated during the UST removal was used to backfill each excavation Clean soil was <br /> imported to "cap" each excavation <br /> PREVIOUS SUBSURFACE INVESTIGATION <br /> ' The followin is a brief summary of site assessment activities <br /> g �Y <br /> ' 0 In December 1995, AGE advanced five soil probe borings at the site Free hydrocarbon <br /> product was encountered in ground water samples collected from the site However, soil <br /> samples indicated that hydrocarbon-impacted soil was limited to the capillary fringe or lower <br /> vadose zone (Tables I and 2) Locations of the probe borings are illustrated on Figure 2 <br /> • In June 1996, AGE installed four ground water monitoring wells <br /> • On 29 July 1999,a total of six soil probe borings(P6 through P 11)were advanced at the site <br /> and off the site north, east and northwest of the former UST location TPH-d was detected <br /> in all five of the grab ground water samples analyzed at concentrations from 430 µg/1 to <br /> 1,100 µg/1 TPH-g was detected in three soil samples analyzed at concentrations as great as <br /> 350 milligram per kilogram(mg/kg)in soil sample P 10-20' TPH-g was detected in soil from <br /> ' 15 feet and 25 feet bsg at concentrations of 160 mg/kg and 14 mg/kg, respectively TPH-g <br /> Advanced GeoEnvironmental,Inc <br />