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r Quarterly Summary Report . 4 First Quarter 1998 Circle K Service Station#1205 16470 Cambridge Street Lathrop, California BACKGROUND The site is an active Circle K Service Station located at 16420 Cambridge Street in Lathrop, California On November 10, 1997, three underground storage tanks (USTs), product dispensers, and associated product lines were removed from the site Approximately 1,241 tons of hydrocarbon-impacted soil was removed from beneath the USTs and in the area of the new UST pit and transported to Forward Landfill in Stockton for disposal In addition, approximately 17, 000 gallons of hydrocarbon-impacted groundwater was removed from the new UST pit and transported to a permitted facility for treatment Soil samples collected from beneath the former UST complex reported concentrations of total petroleum hydrocarbons as gasoline (TPH-g) ranging from 130 to 5,800 milligrams peg kilogram(mg/kg) Benzene was reported in two of the six samples collected at concentrations of 0 52 and 3 6 mg/kg Methyl tertiary butyl ether (MtBE) was reported in two of the six samples at concentrations of 0 19 and 3 6 mg/kg Total lead was not detected in any of the samples analyzed • RECENT QUARTER ACTIVITIES Preparation of Additional Site Assessment Report based upon findings during the UST removal on November 10, 1997 ANTICIPATED NEXT QUARTER ACTIVITIES The completion and submittal of the Work Plan for Additional Site Assessment Upon approval of the work plan, PEG'S scope of work during the second quarter, 1998 includes the installation of four groundwater monitoring wells CHARACTERIZATION/REMEDIAL STATUS Current Phase of Project? Proposal for groundwater monitoring in progress Frequency of Sampling? N/A - Current Remediation Techniques?N/A Soil remediation in progress? No Start?N/A Groundwater Gradient? Unknown Dissolvedifree product remediation in pragress9 N/A CONSULTANT: Pacific Environmental Group, Inc ' 911-005 lA/1Q98_QSR DOC April 30 1998