Laserfiche WebLink
1 <br /> ' 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 areas <br /> 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 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 imported <br /> to "cap" each excavation. <br /> PREVIOUS SUBSURFACE INVESTIGATION <br /> ' The followingis a brief summa of site assessment activities: <br /> summary <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 lower <br /> ' vadose zone (Tables 1 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 P11)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 430µg/l to 1,100 <br /> µg11. TPH-g was detected in three-soil samples analyzed at concentrations as great as 350 <br /> milligram per kilogram(mg/kg)in soil sample P10-20'. TPH-g was detected in soil from 15 <br /> ' feet and 25 feet bsg at concentrations of 160 mg/kg and 14 mg/kg,respectively. TPH-g was <br /> Advanced GeoEnvironmental,Inc. <br />