SITE INFORMATION AND CORRESPONDENCE

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`..+' W August 9, 1994 ARCO Meeting Page 2 7906 N. El Dorado St., Stockton ARCO Facility #2130 PHS/EHD contact - Michael Infurna The recently submitted Problem Assessment Report(PAR)requires an addendum evaluating an additional remedial alternative and a feasibility study as per the Corrective Action Regulations, a copy of which was provided to you during the meeting. A permit application with an $89 fee to install the additional wells should also be submitted, as proposed in the PAR. The monitoring well recently covered with a new asphalt layer is to be located, repaired as necessary, and sampled immediately. An update to the site map shall be submitted and PHS/EHD requests that the "B" designations of wells be dropped in an attempt to avoid confusion. The wells which are currently hooked up to the vapor extraction system should be clearly presented. Quarterly monitoring reports for first and second quarter, 1994 are to be submitted to PHS/EHD immediately and future reports shall be submitted prior to the next quarter's monitoring event. A complete "zero" line for both soil and groundwater has not been delineated. Proposals to complete this requirement shall be included within a PAR addendum along with a time schedule for their timely implementation. 441 W. Charter Way, Stockton ARCO Facility #2168 PHS/EHD contact - Michael Infurna Quarterly reports are overdue for this site and both first and second quarter 1994 reports shall be submitted to PHS/EHD and CVRWQCB immediately. Future quarterly reports shall be submitted prior to the next quarter's monitoring. An addendum to the PAR shall be submitted and will include a discussion and a feasibility study for an additional alternative remediation proposal that would restore the groundwater to beneficial use status. Further discussions shall be scheduled to consider the possible off site and upgradient source(s) of groundwater contamination and shall include other responsible parties, as well as PHS/EHD and Arco representatives. 800 E. Kettleman, Lodi ARCO Facility 2076 PHD/EHD contact - Mary Meays The groundwater sample results of the "Fourth Quarter Monitoring Report" evidenced groundwater contamination. Kyle Christie indicated that there was some problems with the decontamination procedures which were being used by the sampling firm. There are no plans to begin soil remediation within the next year; however, the groundwater will continued to be monitored and sampled quarterly. 1612 Hammer Lane, Stockton ARCO Facility #548 PHS/EHD contact - Mary Meays The contents of the PAR were discussed and the addendum which was requested by PHS/EHD was submitted at the meeting. The contamination which was detected in MW6, during the first quarter 1994, may have been a result of the decontamination procedures used because numerous sites which had never evidenced groundwater contamination had detectable contamination during this sampling event. PHS/EHD was informed that no contamination was detected in the samples collected during the second quarter monitoring event, thus indicating that the groundwater plume has been defined.