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ERI 205513 QS7 Tosco 76 Service Station 5886 Stockton California January 29 1999 calculated hydraulic gradient of approximately 0 004 Historical groundwater flow directions and gradients are shown on the Groundwater Flow Direction and Gradient Diagram (Plate 3) TPPHg and benzene were not detected at or above laboratory method detection limits in groundwater samples collected from the groundwater monitoring wells Diesel range hydrocarbons were detected in well MW713 at 53 parts per billion (ppb) - MTBE was detected in the all groundwater monitoring wells ranging from 2 7 ppb to 5,000 ppb using Environmental Protection Agency (EPA) method 8260 Oxygenated compounds ethanol, tertiary butanol, dl-Isopropyl ether (DIPS), ethyl tertiary butyl ether (ETBE), and tertiary amyl methyl ether (TAME) were not detected at or above laboratory method detection limits • Tosco has successfully obtained access agreements from several property owners directly across March Lane (south and southwest) However, Tosco has been unsuccessful in its attempts to obtain an access agreement with the owner of the property adjacent to the western Tosco property boundary to allow off-site use of a CPT • Tosco requested that the County assist in obtaining an access agreement with Thompson, Partners Limited, the property owners of 2727 March Lane (IN AND OUT BURGER), Stockton, California to facilitate implementation of the off-site CPT investigation The Thompson Partners Limited office is located at 1919 Grand Canal Boulevard, #B-5, Stockton, California 95207 NEXT QUARTER ACIVITIES • Tosco is expecting approval from the County of the proposed CPT locations • Tosca will continue quarterly groundwater monitoring and sampling at the subject site • ERI and Tosco will continue to conduct a comprehensive review of the data acquired during previous work The results will be presented to the County in quarterly reports, which describe the status of the proposed work by the dates established by the County • ERI and Tosco are presently evaluating the possibility of drilling within the sidewalk portion of the City of Stockton, March Lane right-of-way and properties located west of the In and Out Burger property 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 8, 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 4