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III N I N f 1620 Executive Court Sacramento,CA 95864 ENGINEERING AND ENVIRONMENTAL SERVICES Telephone: (916) 485-7222 FAX: (916)485-8098 10 March 1995 i Mr. Bill Benner Department of Public Works City of Tracy 520 Tracy Boulevard Tracy, California 95376 + s I Subject: Correction to 8 September 1994 Closure Report City of Tracy Fire Station No. 2 301 Grantline Road i Tracy, California Dear Mr. Benner: I Mr. Sasson of San Joaquin County has kindly brought to my attention that the third bulleted paragraph on page 4 of our above referenced report contains an error. This paragraph summarizes information which was presented in our June 1994 report and regards the statement that toluene was not detected in the April 1994 soil sample at a concentration greater than its method detection limit of 0..005 mg/Kg. This statement is 1 incorrect as toluene was detected at a concentration of 0.007 mg/Kg, as correctly reported on page.4 of our June 1994 report. Therefore, the third bullet of page 4 of the 8 September 1994 report entitled "Closure Report, City of Tracy, Fire station No. 2," should read as follows: • Total petroleum hydrocarbons as diesel, benzene, ethylbenzene, and total xylenes were not detected in the soil sample collected from beneath the former location of the UST at concentrations greater than their method detection limits of 1 mg/Kg, 0,005 .mg/Kg, 0.005 mg/Kg, and 0.015 mg/Kg, respectively. Toluene was detected at a concentration of 0.007 mg/Kg, which is slightly greater than its method detection limit of 0.005 mg/Kg. As stated in our 1 June 1994 report entitled "Groundwater Sampling and UST Soil Investigation Results - April 1994" petroleum hydrocarbons as diesel and benzene, toluene, ethylbenzene, and total xylenes have not been detected in shallow groundwater or shallow soil, except for one soil sample. We have concluded that the detection of I