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San Joaquin County Public Health Services <br /> Project No. 3-49120-31 <br /> Page Two <br /> TPHG or BTEX in any of the groundwater samples collected from this site. The last sampling <br /> event, conducted in December 1991, was the fourth consecutive quarter with TPHD, TPHG and <br /> BTEX not detected in any of the groundwater samples collected from the groundwater monitoring <br /> wells. It should be noted that none of these compounds have ever been detected in monitoring well <br /> MW-1 (RESNA,January 1991). <br /> Recommendations <br /> In light of the fact that no contamination has been detected at this site for the past four quarters,the <br /> submission of a corrective action plan is unwarranted at this time. In compliance with the LUFT <br /> (Leaking Underground Fuel Tank) Field Manual, it is the recommendation of RESNA that Quik <br /> Stop request a cessation of quarterly groundwater monitoring at this site. This quarterly <br /> groundwater monitoring program should be replaced with two semi-annual monitoring events. If <br /> the results of these two analyses also fail to detect TPHD, TPHG and BTEX, Quik Stop should <br /> request that groundwater sampling and monitoring at this site be discontinued <br /> References <br /> Exceltech, October 1990, "Soil and Groundwater Investigation at Quik Stop Market No. 120, <br /> 9321 North Thornton Road, Stockton, California"; unpublished technical report for Quik <br /> Stop Markets, Inc., Fremont, California. <br /> RESNA,January 1991,December 1991, "Quarterly Groundwater Sampling and Analysis for Quik <br /> Stop Market No. 120, 9321 North Thornton Road, Stockton California'; unpublished <br /> technical report for Quik Stop Markets,Inc.,Fremont,California. <br /> Leaking Underground Fuel Tank Task Force, "October 1989, Leaking Underground Fuel Tank <br /> Field Manual; Guidelines for Site Assessment, Cleanup and Underground Storage Tank <br /> Closure'; State Water Resources Control Board, State of California,pg. 61. <br /> If you have any questions regarding this report,please call. <br /> Sincerely, <br /> RESNA Industries, Inc. <br /> 'chard A. arlow, R.E.A. 1365 Lawrence D. Pavlak, C.E.G. 1187 <br /> Senior Project Geologist Senior Program Geologist <br /> RAG/LDP/sw <br /> or: Jack Griffith, Quik Stop Markets, Inc. ARE D G <br /> Jim Rubin, RESNA \�'� c;`CE D,p �O <br /> Beth Thayer, California Regional Water Quality Control Board �L �G� <br /> r.� N2 1187 , <br /> CERTIFIED <br /> ENGINEERING <br /> s GEOLOGIST <br /> �� <br /> OF CAV\f , <br />