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3 ; <br /> JUL-03-41 15:30 Fram:l T CORPORATION 5102282541 T-683 P 03/06 : -111 <br /> IIsI'EEI'.NAMNAL TECHNOLOGY GORFORATJON <br /> Ms. Mary Ways 2 July 2, 1997 <br /> located in Pacheco, California, for TPH as diesel analysis. An Analysis Request and Chain-of- <br /> Cuslody(ARCO)record accompanied the sample. The sample was analyzed for TPH as diesel using <br /> modified EPA method 8415. <br /> $CIWI <br /> The average groundwater depth measured in the wells was 50.48 feet, which indicated an average <br /> rise in the groundwater at the site of 9.69 feet since August 1996. The well casing elevations were <br /> previously surveyed relative to an arbitrary bench mark at the site that was set to 100.00 feet. <br /> Relative to the bench mark,the water table elevation at the site varied between 47.26 feet and 49.13 <br /> feet in June 1997. Groundwater was inferred to flow north-westerly in the three shallow monitoring <br /> wells and north-easterly in the throe deep monitoring wells. A summary of the current and historical <br /> groundwater data is provided in Table 1. <br /> The groundwater analytical result did not indicate any TPH as diesel above the detection limit of 50 <br /> pg/L. The laboratory quality control data was determined to be acceptable_ The laboratory report <br /> is provided as Appendix A. <br /> Conclusions&nd RWQMmendations <br /> This report supplements the Site Closure Report generated for the site by IT in June 1997, The <br /> absence of TPH as diesel in the groundwater at MW-4 confirms historical sampling results, and <br /> therefore no further corrective action is recommended at this site. Upon approval from the San <br /> Joaquin County PHS&M,the monitoring wells should be abandoned in accordance with California <br /> state and local guidelines. <br /> Should you have further questions,please do not hesitate to call Mr.Frank Yoneshige at(209)467- <br /> 2225 or myself at(510)372-5253. <br /> Sincerely, <br /> Linos Farias <br /> Project Manager <br /> Attachments <br /> CC" Ms. Elizabeth Thayer, Central Valley RViWQCB <br /> Mr.Frank Yoneshige,Lipton <br /> Mr. Bud Kopp, Lipton <br /> rr corpaQ,iCon is a wnaQy'0Wara-'tUaU W at Mmnmo ra!rt•i„.1fiW CCWPCW 4vr <br />