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r r • Remedial Action Confirmation Work Plan MEL BOKIDES PETROLEUM, INC. 501 W. Lodi Avenue, Lodi, California 1.0. INTRODUCTION At the request of Mel Bokides Petroleum, Inc., (MBP)Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed work plan for 501 W.Lodi Avenue,Lodi,California.Analytical data from installation and operation of a soil vapor extraction/in-situ air sparging (SVE/IAS) system and quarterly ground water monitoring has indicated an overall reduction of hydrocarbon concentrations at the site; however, during a 27 March 2003 meeting with representatives of the Central Valley Regional Water Quality Control Board(CVRWQCB) and the San Joaquin County Environmental Health Department (EHD), AGE was requested to conduct an off-site ground water investigation to define the down-gradient, lateral extent of the dissolved methyl tertiary-butyl ether (MTBE) contamination. The scope of work was to include off-site collection and analysis of"grab" ground water samples down-gradient from the remediation system. This work plan was prepared in accordance with CVRWQCB guidelines for corrective action at leaking underground storage tank sites.The location of the site is illustrated on Figure 1;the layout of existing structures and the locations of monitoring and soil vapor wells are illustrated in Figure 2. 2.0. BACKGROUND The site was formerly operated as an Arco service station which stored and distributed gasoline fuel for retail sale. Ground water is currently encountered at the site at a depth of approximately 45 feet bsg and has a dominant southerly flow direction. An SVEAAS system has been in operation at the site since July 2000; operation of the soil vapor extraction/in-situ air-sparging (SVE/IAS) system has reduced the extraction vapor concentrations to low levels, which are below the clean-up goal specified in the corrective action plan (CAP) for the site. In addition, quarterly ground water monitoring/sampling has indicted a general trend of decreasing concentrations of hydrocarbons and fuel additives, and benzene, toluene, ethylbenzene and xylenes ( BTEX) and MTBE were not detected in confirmation soil samples collected on 25 October 2002. Additional site background information, including details of previous site assessment work,can be found in'the AGE-prepared Remedial Action Work Plan, dated 27 March 2000. Advanced CeoEnvironmental,Inc.