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av <br /> TA A1117 I-ono f <br /> olm Avon <br /> Modulo, CII 05361 <br /> Fax 209.592229 <br />,- A S S 0 C I A T E S I N C <br /> 94t <br /> September 20, 1999 <br /> 54.17292.0004 <br /> Mr. Jeff Wong <br /> 4 San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> . 1 <br /> Subject: Additional Analytical Reporting, for Stockton Unified School District <br /> Corporation Yard, 1932 North El Pinal Drive, Stockton, California <br /> i <br /> Dear Mr. Wong: ; <br /> ATC Associates Inc., on behalf of the Stockton Unified School District, has prepared this <br /> correspondence in order to submit additional laboratory results associated with soil samples <br /> collected at the site. On February 23, 1999 soil samples were colle3cted in the vicinity of the <br /> project site's former diesel underground storage tanks. These samples were subsequently <br /> submitted to Sequoia Analytical laboratory and analyzed for total petroleum hydrocarbons as <br /> diesel (TPHd), benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Methods <br /> 8015M18020. Field activities.and laboratory results are summarized in ATC's Summary Report <br /> ofAdditional Subsurface Investigation (Summary Report) dated June 2, 1999. <br /> Following a review of ATC's Summary Report, San Joaquin County Public Health Services, <br /> 'i Environmental Health Division recommended the soil samples collected from soil borings S133, <br /> SB4, and SB5 be read and interpreted for the presence of methyl tertiary butyl ether (MTBE). <br /> This recommendation was made in order to satisfy Health and Safety Code § 25299.37.1 + <br /> requirements. <br /> f At the request of ATC, Sequoia Analytical reviewed and interpreted chromatograms of the soil <br /> samples collected from borings S133, SB4, and SBS for the presence of MTBE. Sequoia <br /> Analytical concluded MTBE was not present in the soil samples above laboratory detection <br /> limits. <br /> Analytical results are summarized on Table 1 Revised laboratory data sheets are included as <br /> Attachment 1. <br /> l <br />