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i�. 1620 Executive Court <br /> j'j f 1 l 1 ✓ 1 1 R R I R Sacramento,CA 95864 <br /> i <br /> ENGINEERING AND ENVIRONMENTAL SERVICES Telephone: (916) 485-7222 <br /> FAX: (916)485-8098 <br /> D 10 March 1995 <br /> Mr. Bill Benner <br /> Department of Public Works MAR 1 � 1995 <br /> City of Tracy <br /> 520 Tracy Boulevard ENVIRONMENTAL HEALTH <br /> Tracy, California 9537bF <br /> PERMITISERVIC_S <br /> Subject: Correction to 8 September 1994 Closure Report <br /> City-of Tra.cy-Fire,Sta tion-No. ?. <br /> 301 Grantline Road <br /> Tracy, California <br /> Dear Mr. Benner: <br /> Mr. Sasson of San Joaquin County-has kindly brought to my attention that the third bulleted paragraph on <br /> page 4 of our above referenced report contains an error. This paragraph summarizes information which <br /> was presented in our June 1994 report and regards the statement:that toluene was not detected in the <br /> April 1994 soil sample at a concentration greater than its method detection limit of 0.005 mg/Kg. This <br /> statement is incorrect.as toluene was detected at a concentration of 0.007 mg/Kg, as correctly reported on <br /> page 4 of our.June 1994 report."Therefore, the third-bullet of page;4 of the 8.September.1994 report { <br /> entitled "Closure Report; City of Tracy, Fire station No. 2," should read as follows: h <br /> • Total petroleumhydrocarbons as.diesel, benzene, ethylbenzene, and total xylencs were not detected <br /> in the soil sample collected from beneath the former location of the UST at concentrations greater <br /> than their method detection limits of"l mg/Kg, 0.005 mg/Kg, 0.005 mg/Kg, and 0.015 mg/Kg, <br /> respectively. Toluene was detected at a concentration of 0.007 mg/Kg, which is slightly greater than <br /> its method detection limit of 0.005 mg/Kg. <br /> As stated in our 1 June 1994 report entitled "Groundwater Sampling and USTSoilInvestigation Results - <br /> April 1994" petroleum hydrocarbons as diesel-and benzene; toluene, ethylbenzene, and total xylenes <br /> have not been detected in shallow groundwater or shallow soil, except for one soil sample. We have <br /> concluded that the detection of only toluene in one soil sample at a concentration of 0.007 mg/Kg does <br /> not indicate a significant potential impact to shallow groundwater. On this basis, we recommend that no <br /> further site investigations be required and that site closure be approved by San Joaquin County <br /> Environmental Health Department. <br /> I <br /> Sincerely yours, <br /> HELMICK&LERNER INC. <br /> Dennis B. Nakamoto, C.E.G. <br /> Project Manager <br /> i <br /> cc Mr. Steven'Sasson,Stanislaus County Environmental Health Division <br />