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Emcon <br /> 1433 North Market Boulevard •5acramento,cajitorrli� , ¢f.1,4�r'+ncs+ib 8 3300• Fax(916)928 3341 <br /> ..Ef= -L QTH <br /> June 20, 1995 <br /> Project 1254-134.002 <br /> Mr. Harlin Knoll <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Division <br /> P. O. Box 388 <br /> 445 North San Joaquin Street <br /> Stockton, California 95201-0388 <br /> Re: Use of Excavated Soil as Backfill at the Tosco Northwest Company Station No. <br /> 11194, 2375 North Tracy Boulevard, Tracy, California <br /> Dear lair. Knoll: <br /> At the request of Tosco Northwest Company (Tosco), EMCON is requesting permission <br /> to place soil generated during fuel dispenser and product line replacement activities <br /> (currently stockpiled onsite) back into the trenches at the Tosco Station No. 11194 located <br /> at 2375 North Tracy Boulevard, Tracy, California. <br /> Between June 3 and June 7, 1995, Paradiso Construction, under the direction of Tosco, <br /> excavated approximately 35 cubic yards of soil during the replacement of product lines and <br /> four fuel dispensers at the site. EMCON collected soil samples from beneath the former <br /> fuel dispensers (Dsp-I through Dsp-4) and product lines (L-1 and L-2) on June 6, 1995 to <br /> document the condition of soils in these areas. In addition, EMCON collected one four- <br /> point composite soil sample from the stockpiled soil (SP1). <br /> The soil samples were submitted to a state certified analytical laboratory. Soil samples <br /> Dsp-I through Dsp-4 and L-1 and L-2 were analyzed for total petroleum hydrocarbons as <br /> gasoline (TPH-G), total petroleum hydrocarbons as diesel (TPH-D) and benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX). Soil sample SPI was analyzed for TPH-G, TPH-D, <br /> BTEX. and total lead. <br /> The certified analytical reports are included as attachment A. The results indicate that <br /> TPH-G was detected at concentrations ranging from non-detect to 12,000 milligrams per <br /> kilogram (mg/kg), TPH-D was detected at concentrations ranging from non-detect to <br /> 1,560 mg/kg and BTEX constituents were detected at concentrations ranging from non- <br /> detect to 120 mg/kg. The stockpile composite soil sample contained TPH-G and TPH-D <br /> 5AC\H:1«Z N-WORDITRACY2.DOC-951brd:1 <br />