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Quarterly Summary Report <br /> Second Quarter 1998 <br /> Circle K Service Station#1205 <br /> 16470 Cambridge Street <br /> Lathrop, California <br /> BACKGROUND <br /> The site is an active Circle K Service Station located at 16420 Cambridge Street in Lathrop, <br /> California On November 10, 1997, three underground storage tanks (USTs), product <br /> dispensers, and associated product lines were removed from the site Approximately 1,241 tons <br /> of hydrocarbon-impacted soil was removed from beneath the USTs and in the area of the new <br /> UST pit and transported to Forward Landfill in Stockton for disposal In addition, <br /> approximately 17, 000 gallons of hydrocarbon-impacted groundwater was removed from the i <br /> new UST pit and transported to a permitted facility for treatment <br /> Soil samples collected from beneath the former UST complex reported concentrations of total <br /> petroleum hydrocarbons as gasoline (TPH-g) ranging from 130 to 5,800 milligrams per <br /> kilogram (mg/kg) Benzene was reported in two of the six samples collected at concentrations <br /> of 0 52 and 3 6 mg/kg Methyl tertiary-butyl ether (MtBE) was reported in two of the six <br /> samples at concentrations of 0 19 and 3 6 mg/kg Total lead was not detected in any of the <br /> samples analyzed <br /> RECENT QUARTER ACTIVITIES <br /> The Well Installation Work Plan was submitted to San Joaquin County on June 10, 1998 <br /> ANTICIPATED NEXT QUARTER ACTIVITIES <br /> Upon approval of the work plan, PEG'S scope of work during the Third Quarter 1998 includes <br /> the installation of four groundwater monitoring wells and one continuous core Geoprobe® <br /> boring Post installation, the wells will be sampled Samples will be submitted to a California <br /> State certified laboratory for analysis A summary report will be submitted shortly thereafter <br /> CHARACTERIZATION/REMEDIAL STATUS <br /> Current Phase of Project? Proposal for groundwater monitoring in progress <br /> Frequency of Sampling? N/A <br /> Current Remediation Techniques9 N/A ` <br /> Soil remediation in progress? No <br /> Start?N/A <br /> Groundwater Gradient? Unknown <br /> Dissolved/free product remediation in progress? N/A <br /> CONSULTANT: Pacific Environmental Group, Inc <br /> 911-005 1 A/2Q98_QSR DOC Junc29, 1998 <br /> E <br />