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f 1 \ PUBL� CC HEALTH SEYVICES Qp�UrN:•C` SAN JOAQUIN COUNTY JOGI KHANNNA MD..M.P.H. Health Officer _ P.O. Sox 2009 • (1601 fast Hazelton Avenue) • Stockton,t�onia r90 � 1 \ 6F (209)468-3400 ARTHUR L WYATT, JR 6290 CHESAPEAKE CR SEP 1 STOCKTON CA 95209 RE: ARCO MINI MART 4511 PACIFIC AVENUE; STOCKTON SITE CODE: 1216 On Thursday, September 9, 1993, Diane Hinson, a San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) member of the Site Mitigation Program, met with you, Victor Cherven, Geological Audit Services, Inc. (GASI) , and Daljit Gill, operator of the station, to discuss the appropriate remedial actions for the restoration of the soil and groundwater. This letter will serve as a summation of that meeting and additionally will serve as a directive for continued site mitigation. Mr. Cherven provided an overview of the three monitoring well sampling events + which have occurred with August being the most recent sampling event. The data evaluated to date indicates that the soil contamination may extend ibeyond borings f #1, #2, and #4. The groundwater petroleum hydrocarbon plume appears to be defined to the north (McDonald's boundary) and possibly to the south (Rosemarie Lane boundary) . Three areas of concern were identified for the meeting discussion: tank replacement; soil remediation; and further groundwater contamination delineation. Tank Re lacement and Soil Remediation Consensus during the meeting placed tank replacement as a high priority. Removal of the existing tanks will accomplish the upgrading of the tank system to ensure the discontinuation of a "point source" contributor, and secondly; will conclude whether the tank pit must undergo mitigative action (i.e. , . short term soil removal and/or long term corrective action) . PHS/EHD will determine during the tank removal whether corrective action will be necessary prior to the installation of new dual-walled underground storage tanks (UST) . Should PHS/EHD issue a directive for corrective action following the BST removal, GASI will prepare an addendum to the current workplan for the installation of a soil remediation system prior to the installation of new dual- walled OST system. During the meeting, two remedial alternatives were briefly discussed: in-situ bioremediation and bioventing. At the conclusion of preliminary field tests and installation of the appropriate system, at least three proposals shall be submitted detailing physical, chemical, and economical feasibility. The PHS/BHD directive will expedite system installation, however, the actual operation and mai tenancenofathensand o 1 remediation system may need to undergo the bid process in order to comply with the State funding requirements. A Division or San Joaquin County Health fare Setv+ceb — I