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Jahn P. Cummings Associates <br /> Environmental Conan ants <br /> 1 < < a"� <br /> Ph (510) 505-0722 f7f,MC E <br /> Fax (510) 791-3306 P C Box 2847 <br /> 2 B P14 Froont, CA 94536-2847 <br /> File No. 0394032,00 <br /> June 20, 1999 <br /> Mike Infurna, REHS <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 Weber Ave. Third Floor <br /> Stockton CA 95202 <br /> Re: Addendum to "File Closure" Report <br /> 18775 Tom Paine Rd. Tracy CA <br /> j Site Code 4367 <br /> Dear Mr. Infurna: <br /> Please accept my apologies for not getting back to you regarding <br /> your telephone inquires sooner. The five questions that you had <br /> are noted and answered below. <br /> 1. The Hydropunch Log for HP-2 indicated that at 20 feet the <br /> sample was lost. This was true, however the hydropunch <br /> collection device was reintroduced and some soil was collected at <br /> an estimated 22 feet with a sufficient quantity to allow for <br /> analysis. This sample should have been identified as HP-2-22 <br /> instead of HP-2-20 as was shown on the Chain-of Custody Form. <br /> 2. Your second query was that if File Closure is granted it is <br /> granted with the idea that the subject property is identified as <br /> farm land. I have been informed by my client that they <br /> understand that if file closure is granted it is based on the <br /> perception that the subject site closure is based on the present <br /> use and continued use as agricultural property. <br /> 3 . The values for original soil in advance of the Hydropunch in <br /> HP-2 at 15 feet were ND for TPHG, MTBE and Benzene. The values <br /> for Toluene, Ethylbenzene and Xylene were 0.006, 0. 006 and 4 .011 <br /> respectively with a detection limit of 0 .005 . within analytical <br /> variance these value are essentially ND. The soil sample, at HP- <br /> 2-22 (see paragraph number 1 ) was collected after reentry of the <br /> hydropunch collection device which may have picked up some soil <br /> from the upper strata in the perforation. The values for TPHG, <br /> MTBE and Benzene then were 3 . 9, ND and ND PPM. Please note that <br /> the TPHG values had no recognizable pattern on the chromatograph. <br /> The values for Toluene, Ethylbenzene and Xylene were 0 .015, 0. 016 <br /> and 0 . 037 respectively. <br /> The concentration of TPHG in the soil sample, identified as HP-2- <br /> 22, is less than 5 PPM. ND values were determined, in this same <br /> 1 <br />