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1F t • • Quarterly Summary Report Fourth 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 per i , 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 • Groundwater monitoring Wells MW-1 and MW-2 were installed on August 21, 1998 In addition, one continuous soil boring was advanced south of the new UST complex in an effort to delineate the lateral extent of petroleum hydrocarbons in the soil and groundwater RECENT QUARTER ACTIVITIES • The Fourth Quarter 1998 sampling event was performed • The Third Quarter 1998 Quarterly Sampling Report (QSR) was submitted • Approximately 12 cubic yards of hydrocarbon impacted soil was transported off-site to Forward Landfill inStockton, CA J • Submittal of a Groundwater investigation Report • The Offsite Research and Sensitive Receptor Survey Report was prepared a { 911-005 1 B/4Q98_QSR DOC 2 January 20, 1999