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• ERI 205513 QS3 Unocal Service Station 5886 Stockton, California January 28 1998 <br /> MTBE concentrations appear to be decreasing in each well including MW3 located <br /> adjacent to the existing tank pit, other oxygenate compounds were not detected in <br /> groundwater samples These data further indicate that there is not an ongoing source <br /> + Tosco and ERI have selected proposed off-site cone penetrometer (CP) locations to further <br /> evaluate the extent of dissolved MTBE detected in groundwater during fourth quarter 1997 <br /> quarterly groundwater monitoring The proposed CP locations are shown the Plate 2 for <br /> review and approval by San Joaquin County PHS/EHD <br /> • Tosco has obtained access agreements from several owners of properties directly across <br /> March Lane (south and southwest) and is attempting to obtain access agreements with <br /> owners of properties across March Lane and adjacent to the western Tosco property boundary <br /> to allow off-site use of a cone penetrometer (CP) <br /> The following work is being performed <br /> Tosco will continue quarterly groundwater monitoring and sampling at the subject site and will <br /> attempt to obtain access agreements with additional property owners <br /> ERI and Tosco will continue to conduct a further comprehensive review of the data acquired during <br /> previous work and present Quarterly Reports to San Joaquin County PHSIEHD which describe the <br /> status of the proposed work by the dates established by San Joaquin County PHS/EHD <br /> The ongoing work will be completed in accordance with the procedures outlined in ERI's Work Plan <br /> for Supplemental Environmental Investigation (dated July 14, 1997) and Addendum to Work Plan <br /> (dated August 8, 1997) ERI will submit a comprehensive Soil and Water Investigation Report within <br /> 45 days following completion of the field work including installation of monitoring wells <br /> ERI recommends signed copies of this summary report be forwarded to the following <br /> Mr Ronald Rowe, Sr <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> 4 <br />