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Brown and.Caldwe <br /> Y <br /> Be"Consditants <br /> 723 S Street <br /> Sacramento <br /> 61domia 95814-7092 % r'r'UVED <br /> (916)444-0123 <br /> FAX(916)444-8437 <br /> SEP 2 <br /> September 23, 1992 NVl t NMENTAL F 1.HEi+l��P <br /> p PERM ITAPICEU <br /> Ms. Laurie Cotull.a <br /> San Joaquin Count<f <br /> Public Health Services <br /> Environmental Health Division <br /> Post Office Box 2009 <br /> Stockton, California 95201 07.7-6746-02/1 <br /> Subject: Response to Letter from San Joaquin County Regarding <br /> ARCO Station 21:3, Strcktor., Site Code 1021. <br /> Dear Ms. Cotulla: <br /> The purpose of this letter_ is to respond to the letter dated August 28, 1992, from fhe San <br /> Joaquin County Public Health Services, Environmental. Health Division (County). The letter <br /> addresses a number of items regarding ARCO Products Company (ARCO) Station 23:33 <br /> located at 2908 West Benjamin Holt Drive in Stockton. A copy of the August 28 lener. :is <br /> enclosed as Attachment A. <br /> The letter states that revised Table 4-4,from Brown and Caldwell Consultants' (BCC)July 30, <br /> 1992, letter to the County,,presented laboratory detection limits for benzene on several <br /> samples that were not consistent with the laboratory report. In addition, the lead results were <br /> reported in parts per billion (ppb) in Table 4-4; but the reporting units in the laboratory report <br /> were parts per million (ppm). We appreciate this matter being brought to our attention and <br /> have enclosed a second revised Table 4-4 as Attachment B. However, the correct laboratory <br /> detection limits are well below the designated levels set by the California Department of <br /> Health Services, which are 700 ppb for benzene and 500 ppm for lead. <br /> The letter from the County also states that no quality control data were included in the <br /> laboratory report for EPA Method .602.. Although the headingfor the volatile. organics <br /> columns wasEPA 602,EPA 602. is''ananalytical metfiod used to determine volatile:organic <br /> concentrations in a liquid. The laboratory method. used for the volatile organics in these <br /> samples was EPA 5020. This is reflected in the revised Table 4-4 and we apologize for any <br /> confusion this might have caused. Quality control data is presented in the laboratory report <br /> for EPA Method 8020. <br /> 6746CORRF.SP6746.08.I,3 <br />