SITE INFORMATION AND CORRESPONDENCE

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August 9, 1994 ARCO Meeting Page 4 225 South Cherokee Lane, Lodi ARCO Facility #760 PHS/EHD contact- Linda Turkaae Installation of the soil boringsirapor wells proposed for the alley way to the north and northeast of the site is delayed pending access from the property owner. The current property owner of the alley is unknown because the City of Lodi has xen in the process of returning this land to adjacent property owners. ARCO and/or consultants will research the current property owner and request access. The air treatment system forte remediation at this site will be transferred from another site. ARCO will evaluate all applicable paraaeas(nearby water wells,total contaminant mass available to leach and impact groundwater, etc) to decide which site has priority for the air treatment system. Quarterly reports were discussed in general and an effort will be made to sumbit the reports in a timely manner and to provide adze notice prior to the sampling events. 3425 N. Tracy Blvd., Tracy ARCO Facility #2093 PHS/EHD contact - Harlin Knoll The site has documented p=aleum hydrocarbon soil and groundwater contamination dating back to April 1987. The contaminated groundwater plume has migrated off-site as evidenced in samples collected from MW8. Hydraulic control of dre groundwater is necessary to prevent further off site plume migration. Additional off-site investigz&n is required to define the full extent of soil and groundwater contamination. A "Final Remediation Plan'milizing vapor extraction and possible groundwater extraction was submitted to this office in May 1993. Arco proposes to start-up the remediation system as soon as possible and to continue the off-site investiption characterizing the extent of contamination in the vicinity of MW8. Arco stated the off-site remedianca may utilize the on-site vapor extraction system in the future. 25775 Patterson Pass Road, Tract ARCO Facility 96100 PHS/EHD contact- Margaret Laurio Mr. Robert Vieira has not la responded to the letter sent in April 1994. In order to define the extent of soil contamination, another-scess agreement letter will be sent to Mr. Robert Vieira, for drilling on his property. Remediation of this site will=e postponed until equipment from another site in San Joaquin County becomes available. 501 W. Kettleman Lane, Lodi ARCO Facility #434 PHS/EHD contact - Margaret Lagorio Brown & Caldwell will sunt a plot plan of the proposed changes in the locations of the confirmation borings and other items premusly requested. The installation of the monitoring well to replace MW2 will be scheduled immediately. Any of the confirmation borings on site and off-site (for which access agreements and PHS/EHD hermits have been obtained) shall be drilled at that time. Brown&Caldwell will provide a description of the biofrlter being used to remediate the low concentrations of hydrocarbons emitted from the operating vapor extraction system. Matthew Turner of Brown&Caldwell agreed to meet PHS/EHD szaff at the site to explain the components of the biofilter. The vapor extraction system will continue to operate until cleanup is deemed complete and/or the system is no longer effective as deemed by PHS/EHD.