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of) t . ERI 205513 QS2 Unocal Service Station 5886 Stockton, California October 6, 1997 Department, it appears that underground utilities servicing the site and surrounding properties have been modified during recent construction at the March Lane and U S Interstate 5 offramp These utilities are primarily located within the March Lane right-of-way and are oriented east to west Lateral utility trench lines servicing specific sites are oriented perpendicular to the main utility lines The locations of utility trenches and surrounding sites are shown on Plate 3 The deepest utility trench appears to be a 21-inch sewer line located approximately 70 feet south of the site This line is situated approximately 10 5 feet bgs directly south of the site and is inclined towards the west measuring approximately 12 feet bgs 200 feet southwest of the site • ERI conducted a record search to identify surrounding property owners and forwarded the assessor's parcel numbers (A P N ) to Tosco personal to allow Tosco personal to obtain an acceptable access agreement with the appropriate parties Tosco has forwarded access agreements and is pursuing off-site access agreements with the owners of properties directly across March Lane (south and southwest) and adjacent to the western Tosco property boundary to allow off site use of a cone penetrometer (CP) The following work is being performed • ERI and Tosco are evaluating data from the underground utility search, third quarter 1997 groundwater monitoring and sampling, and historic groundwater flow direction (towards the west-southwest) to select proposed locations to advance a CP into underlying soil ERI will submit the proposed locations to San Joaquin County PHS/EHD for review and approval after obtaining data from the fourth quarter 1997 monitoring and sampling event ERI and Tosco will continue to conduct a further comprehensive review of the data acquired during previous work and present Quarterly Reports to San Joaquin County PHS/EHD which describe the status of the proposed work by the dates established by San Joaquin County PHSIEHD The ongoing work will be completed in accordance with the procedures outlined in ERI'S Work Plan for Supplemental Environmental Investigation (dated July 14, 1997) and Addendum to Work Plan (dated August S, 1997) ERI will submit a comprehensive Soil and Water Investigation Report within 45 days following completion of the field work including installation of monitoring wells ERI recommends signed copies of this summary report be forwarded to the following Mr Ronald Rowe, Sr Site Mitigation Unit San Joaquin County Public Health Services 304 East Weber Avenue, Third Floor Stockton, California 95202 4