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3 4 1 <br /> � fell <br /> INTERNATIONAL TECHNOLOGY CORPORATION <br /> Ms. Mary Meays 2 July 2, 1997 <br /> I <br /> located in Pacheco, California, for TPH as diesel analysis. An Analysis Request and Chain-of- <br /> Custody(ARCC)record accompanied the sample. The sample was analyzed for TPH as diesel using <br /> modified EPA method 8015. <br /> Result <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-ie isterlyin the three deep monitoring wells. .A summary of the current and historical <br /> groundwater:datais provided.in.Table 1. <br /> The groundwater•arwytical result did not`indicate any TPH as diesel above the detection limit of 50 <br /> ug/L. .The laboratory quality control data was determined-to be acceptable. The.laboratory report <br /> is,provided as Appendix A. <br /> �Qnclusioiis a>�d Recommendations <br /> This report supplements the'Site Closure Report generated for the site by IT in June 1997. The <br /> absence of'TPH "a-s 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/EHD; the monitoring wells should be abandoned in accordance with California <br /> state and local'guidelines. <br /> Should'yott'have'fi!rther questions, please do not hesitate to call Mr. Frank Yoneshi eat (209) 467- <br /> 2225 or.mys elf at (510) 372-5253. ��PED G�0 ; <br /> B. Wr��ci <br /> Sincerely, <br /> • . -. � cEaTt,IEo• <br /> GEO OGI <br /> ENGI40CIST6 t� <br /> ** pST��� <br /> EXP �-F'-ice <br /> l OF `FO <br /> f�rfius1a:ia Wynne, R. E.G. <br /> P:oje tvWE_ager'. Technical Advisor <br /> /f <br /> Atfact"en'ss- <br /> cc: W Eiizq.bP it Thayer', Central Valley RWQCB <br /> Mr. Fr"gin'-Yon;shige,Lipton <br /> 1 Ni .':,ud Kopp;'Lipton <br /> IT Corporation is a wholly owned subsidtasy of International Technology Corporation r ." r f <br />