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' r <br /> .jr <br /> 11K2, Inc./SEMCO - <br /> 1751 LESLIE STREET • SAN MATEO,CA 94402 • 415)572-8033 • 415)572-91734'FV <br /> GENERAL ENGIlVEERING&ENVIRONN ENTAL CONTRACTORS • LICENSE NO.719103(A,B,C57,C61-D40,HAZ,ASB) <br /> July 17, 1997 <br /> Ms. Margaret Lagorio <br /> Supervising REHS <br /> San Joaquin County Public Health Services (SJCPHS) <br /> Environmental Health Division <br /> - 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> F <br /> RE: Soil Profiling, Excavation, and Sampling Activities at Thiels Goodyear, 1131 Holly Drive, <br /> Tracy, California (BY2 Project 96-0315.1) <br /> Dear Ms. Lagorio: <br /> This report summarizes the results of soil excavation and sampling activities performed in June 1997 <br /> at Thiels Goodyear, 1131 Holly Drive,-Tracy, California. Figure 1 shows the site location. <br /> Figure 2 is a site plan. The work was performed to remove hydrocarbon-affected soil that had been <br /> wrapped in visqueen and stockpile&in the tank cavity after the waste oil tank was removed in <br /> December 1996. <br /> BACKGROUND <br /> In December 1996 HK2 removed one 550-gallon underground waste oil storage tank(UST) from <br /> the site under the supervision of Mr.. Jerry Yoshioka of the SJCPHS. The concentration of total <br /> petroleum hydrocarbons (TPH) as gasoline and diesel (TPH-G and TPH-D), benzene, toluene, <br /> ethylbenzene, and total xylenes(BTEX), total extractable petroleum hydrocarbons-(TEPH), and semi- <br /> volatile organic compounds (SVOCs) was less than the laboratory reporting limit in the soil sample <br /> collected from the bottom of the excavation (approximately 9 feet below grade [fbg]). The total <br /> concentration of volatile organic compounds (VOCs) was 0.041 mg/kg. The composite sample <br /> collected from excavated soil stockpiled onsite contained 71 mg/kg TPH-G, 1,100 mg/kg TPH-D, <br /> 10,000 mg/kg TEPH, and 0.071 mg/kg benzene. Details are in the Waste Oil Tank Removal Report <br /> submitted to Mr. Yoshioka on February 14, 1997. <br /> Following sample collection,HK2 backfilled the excavation with gavel up to approximately 6.5 fbg, <br /> lined the excavation with visqueen, placed the stockpiled soil in the excavation, folded the visqueen <br /> over the top of the buried stockpiled, and backfilled the remainder of the excavation (approximately <br /> 0 to 1.5 fbg)with Class H base material. The soil stockpile was placed in the excavation so the use <br /> of the site would not be limited during soil profiling activities. <br />