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1 <br /> • 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 property is zoned as industrial and is presently utilized as a <br /> distribution warehouse. Local land use in the immediate vicinity of the site is agricultural and <br /> ' industrial; residential areas are located south of the site. The site is further described as being <br /> located in the southeast quarter of Section 19, Township 2 South , Range 8 East, Mount Diablo <br /> ' Base and Meridian(Manteca Quadrangle, 7.5-Minute USGS Topographic Series, 1968, photo <br /> 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 structures and an asphalt paved and rock covered vehicle <br /> ' storage area. Local land use in the immediate vicinity of the site is agricultural and industrial; <br /> residential areas are located south of the site. <br /> 1• <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 /> 1 <br /> PREVIOUS SUBSURFACE INVESTIGATION <br /> ' The following is a brief summary of site assessment activities: <br /> ' 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 <br /> tlower vadose zone. 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 P11) were advanced at the <br /> . site and off-site to the north, east and northwest of the former UST location. TPH-d was <br /> ' Advanced GeoEnvironmental,Inc. <br /> i <br />