SITE INFORMATION AND CORRESPONDENCE

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August 9, 1994 ARCO Meeting Page 3 Discussion focused on the zing tanks relative to the contamination evidenced at the site. The tanks are currently in compliance and not scheduled for removal until 1998, when ARCO is required by law to upgrade tanks. A continuiag source of contamination may be evidenced by increasing levels of contamination detected in MW5. The groundwater contamirodon evidenced at this site warrants further evaluation prior to the site's prioritization to obtain the N-mor extraction treatment unit necessary to initiate soil remediation. The evaluation will include mass dance calculations based on cross sections, the location of nearby domestic wells, soil permeability and the magnitude of the gradient. The information necessary to evaluate the priority of this site as well as the status of the purchase of an additional treatment unit shall be submitted by September 12, 1994. 2908 W. Ben Holt, Stockton ARCO Facility #2I33 PHS/EHD contact- Mary Ways The progress since the March 1993 meeting was discussed_ PHS/EHD stressed the importance of moving forward with active remediz-.:on of the soil and groundwater contamination evidenced at this site. Both PHS/EHD and ARCO agreed iitat the groundwater extraction system in operation, intermittently since 1986 has not remediated the grouamvater contamination effectively, but'was controlling the migration of the contamination plume. ARCO stated that they had ided to have the vapor extraction/air sparge remediation system installed by May 31, 1994, but because had not yet received the necessary air pollution and building permits, were unable to begin construction. 71ne new facility operator relquested that ARCO not proceed with the system's constructions until after Lasmo Day. ARCO apologized for not having informed PHSIEHD of the situation in a timely manner. ARCO meed 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 smem, this site will be considered non-compliant and formal enforcement action through the CVRNVQCB will be requested. The extent of the soil and --maidwater contamination to the north and south of the site has not yet been defined. It was agreed that Steve Meisner should contact Diane Hinson as soon as possible to discuss gaining access to CalTrans" nroperty and that correspondence should be forwarded to the property owners to the south requesting acres to the property. PHS/EHD indicated that a permit to install additional air sparge and vapor extraction-eils would be issued. ARCO agreed to analyze soil samples collected from beneath static groundwater levels for characterization of the adsorbed soil contamination. 85 East Louise, Lathrop ARCO Facility #6080 PHSIEHD contact - Linda Turkatte This site is considered to be a vow 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 iii:meeting ARCO stated the I wells will be sampled once a year and this year's sampling is scheduled for A-._?-ist. The appropriate advalnce notice to PHS/EHD is required.