SITE INFORMATION AND CORRESPONDENCE

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Upgradien ,, Environmental Cb-asultants September 26, 2002 Mr. Michael Infurna, Senior REHS Public Health Services `Ll Environmental Health Division SEP 2 7 2002 San Joaquin County 304 E. Webber ENVIROINN)ENT HEALTH Stockton, CA 95201 PERMIT/SERVICES Subject: Work Plan for Well Abandonment Kwikee Food Mart R 2081 Country Club Boulevard ,, f Stockton,CA Dear Mr. Infurna: In accordance with your January 15, 2002 directive, two additional quarters of groundwater monitoring have been performed at 2081 Country Club Boulevard(Kwikee Foods). As requested in your letter, water samples were collected from all seven wells on both occasions, and were analyzed for total lead and 1,2-DCA in addition to gasoline,BTEX, and gasoline oxygenates. Quarterly reports were prepared and submitted to your office following both sampling events, and in those reports we concluded that the additional monitoring data support our previous contention that groundwater contamination beneath the site originated off-site at the former Chevron station at 2103 Country Club Boulevard and subsequently migrated eastward under the prevailing hydraulic gradient to 2081 Country Club. We also concluded that active remediation at the former Chevron site is producing the desired result at the Kwikee Foods site. As consultants for Mr. William Peters, we therefore request that our December 2001 application for site closure be approved and that responsibility for the contamination be transferred to the owners of 2103 Country Club. Further, on behalf of Mr. Peters, we have prepared this work plan to destroy the groundwater monitoring wells so that the site may be released from further monitoring. We propose to abandon wells KF-1,KF-2, KF-4',KF-6, and KF-7 in place,because little or no soil contamination was detected in these wells when they were drilled. Benzene was detected in only one sample from these borings, at a concentration of 0.01 parts per million, and other volatile aromatic compounds were either absent or present only at concentrations that were nearly as low as the detection limit. The total concentration of petroleum hydrocarbons (TPH-g) was below the detection limit in all samples. Hence, it is evident that soil in these borings poses no threat to groundwater, and can remain in place. These wells range in depth from 15 to 30 feet, and will pressure grouted with neat cement. No soil samples were collected during drilling of KF-3, but contaminated soil was encountered in nearby Geoprobe®borings. One soil sample from KF-5 was also slightly contaminated(TPH- g was detected at 2.98 parts per million). Therefore, these two wells will be drilled out and Stockton: P.O. Box 8002, Stockton, CA 95208 (209) 772 3620 Cameron Park: 3369 Kimberly Road, Cameron Park, CA 95682 (530) 677-3055