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1 <br />' ANALYTIC RESULTS <br />' Groundwater samples from monitor wells MW-1 through MW-6 from the November, <br /> 1992 event were analyzed for total petroleum hydrocarbons as gasoline(TPH-g) and <br /> total petroleum hydrocarbons as diesel (TPH-d) by modified EPA Method 8015 and <br /> benzene, toluene,ethylbenzene and total xylenes (BTEX) by EPA Method 8020 The <br />' analytic results for all sampling events, including this round of sampling, are <br /> summarized in Table 2 The chain-of-custody form and laboratory reports with quality <br /> assurance/quality control documents are included in Appendix B <br />' <br /> COMMENTS <br />' The groundwater flow direction and gradient for the November, 1992 sampling event <br /> was to the northwest The groundwater flow direction for the August, 1992 sampling <br /> event was to the south-southeast direction TPH-g concentrations were detected at <br />' levels as high as 20,000 ppb in MW-4 The BTEX compounds were detected at levels <br /> as high as 7,600 ppb (in MW-4), 3,100 ppb (in MW-4), 17 ppb (in MW-6) and 2,100 <br /> ppb (in MW-4),respectively Due to the dilutions needed, the detection limits for <br />' ethylbenzene in the samples from MW-3 and MW-4 were 5 and 15 ppb, respectively <br /> The normal detection limit for ethylbenzene is 0 5 ppb <br /> TPH-d was not detected and the diesel analyses will be discontinued in the future As <br /> requested by Ms Linda Turkatte of the San Joaquin County Public Health <br /> Service/Environmental Health Division, lead analyses will be performed during the <br /> sampling event <br />' Free product was measured in monitor well MW-1 at 0 41 foot thickness Due to <br /> surface obstructions over MW-2 on the during the full duration of the November, 1992 <br /> sampling event, MW-2 water depth and product thickness data were not obtained It is <br />' estimated that MW-2 contains a few inches of free product <br />' DISTRIBUTION: <br /> Submission to the RWQCB and the local implementing agency should include a copy <br />' of this report(in its entirety) and a cover letter from the property owner/trustee agent <br /> Four copies of this report have been included for your files and for distribution to the <br /> following agencies <br />' Public Health Service/Environmental Health Division <br /> San Joaquin County <br />' 445 N San Joaquin Street <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> Ann Ms Linda Turkatte <br /> Central Valley Region <br />' Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br />' Attn Ms Elizabeth Thayer <br />