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Second Quarter 2002 Monitonng and Sampling Report 4 <br /> 7-Eleven Inc Store#14117 2725 Country Club Boulevard, Stockton, CA July 25 2002 <br /> ' Conclusion and Recommendations <br /> ' Results of the current quarterly sampling event conform to plume delineations presented In the <br /> December 12, 2001 additional assessment report, and verify apparent ongoing Intrinsic biodegradation <br /> outlined in the corrective action proposal (as documented by apparent conversion of MTBE to TBA and <br /> ' then to biomass) Benzene and TPH-G concentrations have remained at low levels or have continued to <br /> decline in well MW-2 (located in the UST pit area), and in crossgradient wells MW-1 and MW-3 A 2,000- <br /> foot door-to-door sensitive receptor survey, and a review of gradient information in SJCPHS files for <br /> ' nearby service stations are recommended for the site per the additional assessment report, and are <br /> scheduled to be completed shortly <br /> ' Remediation at the site is recommended to commence within 30 to 60 days pending SJCPHS <br /> concurrence with the proposed corrective action <br /> If you have any questions or comments concerning this quarterly report, please call our Concord office at <br /> (925) 288-2190 <br /> ' <br /> Sincerely, <br /> Y <br /> Shaw Environmental & Infrastructure, Inc <br /> Submitted by Approved by <br /> Randy E Kir§y elby Lathrop <br /> Project Geolo st Project Manager <br /> Ed K Slmonis, R G <br /> Senior Geologist <br /> C Mr Michael Infurna - San Joaquin County Public Health Services ►t' C99 4422 <br /> Attachments NST <br /> 1 Figures <br /> 2 Tables <br /> ' 3 Field Data Sheets <br /> 4 Laboratory Analytical Report for Groundwater Samples <br /> ' 14117022 doc <br />