Laserfiche WebLink
1 ' <br /> 1444 MARIPOSA ROAD <br /> WKA No 2938 05 <br /> August 26, 1999 <br /> ' Page 2 <br /> using EPA Method 8020, and Methyl-t-butyl ether(MTBE),Dusopropyl ether <br /> (DIPE),Ethyl-t-butyl ether(ETRE), Tert-amyl methyl ether(TAME), and Tert- <br /> Butanol(oxygenates) using EPA Method 8260B <br /> • converting four soil bonngs to groundwater monitoring wells <br /> • obtaining water samples for chemical analysis of TPH as gasoline using modified <br /> EPA Method 8015, BTEX using EPA Method 8020, and MTBE, DIPE, ETBE, <br /> TAME, Tert-Butanol, methanol, and ethanol using EPA Method 8260B <br /> Site Deseri tion <br /> The site is located at 1444 Mariposa Road in the City of Stockton, California and is an active <br /> commercial facility occupied by Stonecraft Industries, Inc The site was formerly occupied by U S <br /> Rentals,Inc,which operated the four underground storage tanks and has been named as the <br /> responsible party for the unauthorized release of fuel The tanks consisted of one 10,000-gallon <br /> gasoline, one 5,000-gallon diesel,one 550 unleaded gasoline and one 550-gallon gasolineloil mix <br /> The site is bounded to the west by Mariposa Road,to the north by East Charter Way,to the south <br /> by Learned Avenue, and to the east by commercial and residential development(Plate 2) Blue <br /> Diamond Walnut is located approximately 500 feet north of the site Surface elevation on site is <br /> approximately 22 feet above sea level Local terrain is relatively flat with very little relief across <br /> the site The site is predominately paved with asphalt <br /> Physiographic and Hydrogeologic Setting <br /> The site is located in the central portion of the Great Valley geomorphic province of California <br /> The Great Valley is bounded by the mountains and foothills of the Sierra Nevada Range to the <br /> east and the California Coast Ranges to the west The Geologic formations of the Great Valley <br /> ' are typified by thick sequences of alluvial sediments deposited during the filling of a large <br /> ancient basin The 1985 United States Geological Survey (USGS) "Geologic Map of the Late <br /> Cenozoic Deposits of the Sacramento Valley and Northern Sierra Foothills, California," shows <br /> the site to be underlain by Holocene age basin deposits These deposits consist primarily of fine- <br /> grained silt and clay These conditions are consistent with those encountered during our dulling <br /> investigations Specifically, subsurface soils at the site consists primarily of silty fine sands to a <br /> 0 <br /> WALLACE KUHL <br /> Rccvcledt, &ASSOCIATES INC <br />