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ERI 205513 QS6 Tosco 76 Service Station 5886 Stockton California October 30 1998 `ow groundwater samples collected from monitoring wells MW3 and MW4D, respectively TEPHd was not detected at or above laboratory method detection limits in these samples when they were reanalyzed following a silica gel cleanup • MTBE was not detected above laboratory method detection limits in monitoring wells MW1, MW5D, MW5S, MW7D, and MW7S MTBE was detected in the remaining groundwater monitoring wells ranging from 8 0 µglL to 4,500 ug/L using EPA method 8260 • Tosco has successfully obtained access agreements from several owners of properties directly across March Lane (south and southwest) Hmeier, Tosco has been unsuccessful to it's attempts to obtain an access agreement with the o«ner of the property adjacent to the western Tosco property boundary to allow off-sitz use of a CPT The following work is being performed • Tosco is currently awaiting approval from the County of the proposed CPT locations • Tosco will continue quarterly groundwater monitoring and sampling at the subject site • ERI and Tosco will continue to conduct a further comprehensive revie« of the data acquired during previous work and present Quarterly Reports to the County which describe the status of the proposed work by the dates established b) (lie County Additionally, Tosco requests that the County assist in obtaining an access agreement with Thompson Partners Limited, the property owners of 2727 March Lane (IN-OUT BURGER), Stockton, California to facilitate implementation of the oft-site CPT investigation The Thompson, Partners Limited office is located at 1919 Grand Canal Boulevard, #B-5, Stockton CA 95207 The ongoing work will be completed in accordance with the procedures outlined in ERI's Work Plan for Supplemental Environmental investigation (dated Jul% 14, 1997) and Addendum to Wort: Plan (dated August 8, 1997) ERI %ill submit a comprehensiNe Soil and Water Investigation Report within 45 days following completion of the field work including installation of monitorine X%ells ERI reconunends signed copies of this summary report be forwarded to the follo«inR Mr Ronald Rowe, Sr Site Mitigation Unit San Joaquin County Public Health Services 304 East Weber Avenue, Third Floor Stockton, California 95202 4