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Quarterly Summary Report <br /> First Quarter 2001 <br /> Tosco (Circle K) Store #1205 <br /> 16470 Cambridge Street <br /> Lathrop, California <br /> CITY Lathrop <br /> COUNTY San Joaquin <br /> BACKGROUND <br /> The site is an active Circle K Store located at 16420 Cambridge Street in Lathrop, California <br /> On November 10, 1997, three underground storage tanks (USTs), product dispensers, and <br /> associated product lines were removed from the site Approximately 1,241 tons of <br /> hydrocarbon-impacted soil were removed from beneath the former USTs and in the area of <br /> the new 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 <br /> new UST excavation and transported to a permitted facility for treatment Soil samples <br /> collected from beneath the former UST complex reported elevated concentrations of total <br /> petroleum hydrocarbons as gasoline (TPH-g), benzene, and MtBE On August 21, 1998 two <br /> groundwater monitoring wells (MW-1 and MW-2) were completed in an effort to delineate <br /> the lateral extent of petroleum hydrocarbons in the soil and groundwater Boring GP-1 <br /> delineated the vertical extent of soil impacts On September 14, 1998 two additional <br /> monitoring wells (MW-3 and MW-4) were installed Based on groundwater gradient and <br /> analytical results, additional assessment is warranted Assessment was conducted in <br /> December 2000 The assessment identified groundwater impacts downgradient and cross- <br /> gradient of the USTs <br /> RECENT QUARTER ACTIVITIES <br /> • Submitted Quarterly Summary Report <br /> • Conducted Quarterly sampling event, including development and sampling of off-site <br /> monitoring wells <br /> • Submitted Assessment Report <br /> 822125/1 gsroo 2 03/14/01 <br />