SITE INFORMATION AND CORRESPONDENCE

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August 9, 1994 ARCO Meeting Page 3 Discussion focused on the txisang tanks relative to the contamination evidenced at the site. The tanks are currently in compliance and nor scheduled for removal until 1998, when ARCO is required by law to upgrade tanks. A continuing source of contamination may be evidenced by increasing levels of contamination detected in .1tW5. The groundwater contamination evidenced at this site warrants further evaluation prior to the site's prioritization to obtain the vapor extraction treatment unit necessary to initiate soil remediation. The evaluation will include mass balance calculations based on cross sections, the location of nearby domestic wells, soil permeability and :he magnitude of the gradient. The information necessary to evaluate the priority of this site as well as:he status of the purchase of an additional treatment unit shall be submitted by September 12, 1994, 2908 W. Ben Holt, Stockton ARCO Facility #2133 PHS/EHD contact- Mary Meays The progress since the Marcs 1993 meeting was discussed. PHS/EHD stressed the importance of moving forward with active remediazon of the soil and groundwater contamination evidenced at this site. Both PHS/EHD and ARCO agreed that the groundwater extraction system in operation, intermittently since 1986 has not remediated the gro=dwater contamination effectively, but was controlling the migration of the contamination plume. ARCO stated that they had:n:.ended to have the vapor extraction/air sparge remediation system installed by May 31, 1994, but because±ry had not yet received the necessary air pollution and building permits, were unable to begin construction. The new facility operator requested that ARCO not proceed with the system's constructions until after Labor Day. ARCO apologized for not having informed PHS/EHD of the situation in a timely manner. ARCO:greed that the remediation systems installation shall be installed immediately after September 1, 1994 and mat the system shall be in operation by September 26, 1994. Please be advised that the progress of this site has been sporadic with numerous lapses in compliance. If diligent and timely progress is not evidenced by September 26, 1994 with the installation and start- up of the vapor extraction system, this site will be considered non-compliant and formal enforcement action through the CVRWQCB will be requested. The extent of the soil and uoundwater contamination to the north and south of the site has not vet been defined. It was agreed that Steve Meisner should contact Diane Hinson as soon as possible to discuss gaining access to CalTrans' =perry and that correspondence should be forwarded to the property owners to the south requesting access to the property. PHS/EHD indicated that a permit to install additional air sparge and vapor extraction wells would be issued. ARCO agreed to analyze soil samples collected from beneath static groundwater!evefs for characterization of the adsorbed soil contamination. 85 East Louise, Lathrop ARCO Facility #6080 PHS/EHD contact - Linda Turkarte This site is considered to be a low priority site with respect to the other ARCO sites in San Joaquin County, The PHS/EHD summary le_-, from the last meeting in March of 1993 recommended at least annual sampling for this site. At ihis meeting ARCO stated the wells will be sampled once a year and this year's sampling is scheduled for August. The appropriate advance notice to PHS/EHD is required.