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Mr. Gary Brophy -2- 20 March 1989 <br /> As requested in our 17 March 1989 letter, quarterly ground water monitoring is <br /> to be initiated. Water samples are to be analyzed for benzene, toluene, <br /> xylene and ethylbenzene (BTX&E) and total petroleum hydrocarbons (TPH) as <br /> gasoline and diesel . quarterly monitoring reports are to be submitted by mid- <br /> April , July, October, and January for the previous calendar quarter, <br /> The Tri-Regional Guidelines specify that a nonitoring well is to be installed <br /> within ten feet of the tank pit in the vera led downgradient direction. This <br /> monitoring well is to be installed, but we tecommend that ground water levels <br /> be measured and gradient direction calculat d once again before selecting the <br /> location for installation. <br /> In summary, we recommend the following work be conducted at your site. <br /> 1 . Soil borings should be drilled northdoeastIof the tank <br /> western extent <br /> it to <br /> determine the extent of soil contamin tiY, <br /> theshould also be determined, but the pr ximity of the building makes it <br /> impractical . <br /> 2. Soil samples are to be collected for every 20 lineal feet of product <br /> E pipeline and beneath the pump islands- If the pipelines. have not been <br /> removed, they are to be removed at this time. <br /> 3. Quarterly ground water monitoring of water levels and RTX E and TPH as <br /> gasoline and diesel is to be initiated. quarterly reports are to be <br /> submitted to us and the SJLHD. <br /> 4. A monitoring well is to be installed within ten feet of the tank pit in <br /> the verified downgradient direction. <br /> It must also be thThexneed forurherdefinitionoftheplume will <br /> noted that t tnnmtaw <br /> need to be further er defined. <br /> be based on the quarterly monitoring results. <br /> w A detailed work plan to conduct the above mentioned work is to be completed <br /> and submitted to us and the SJLHD by 21 Ap it 1989. <br /> If you have any questions, please call me at (916) 361-5725. <br /> EDWARD W. JAMES <br /> ng.ineerin_g G o 99 s.-t <br /> EWJ:ewJ <br /> Enclosures(2) <br /> cc w/o encl : Ms. Diane Hinson, San Joaquin local Health District, Stockton <br /> Mr. Keith Romstad, Applied G osystems, Sacramento <br />