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,k f IT Corporation 3939 Cambrldgf- Road, Suite 220 Cameron Park, CA 95682-9007 S Tel 530 676 6884 the Fax 530 676 6885 ,,*the � (fig:r0up. A Member of rhe I I C roup r^ March 13, 2001 T" Projec,t 911-005 1C Mr Edward C Ralston Tosco Marketing Company 1380 Lead Hili Road, Suite 120 Roseville, California 95661 w Re Off-Site Assessment Report Tosco (Circle K) Store #1205 16470 Cambridge Street Lathrop, California Dt,ar Mr Ralston On behalf of Tosco Marketing Company (Tosco), IT Corporation (IT) is providing this Off Site Assessment Report describing the recent soil and groundwater investigation conducted at the site referenced above (Figure 1) The purpose of this work was to define the horizontal extent of gasoline hydrocarbons m soil and groundwater The assessment scope included the installation and sampling of five groundwater monitoring wells (MW-5 through MW-9) at on-site and off-site locations BACKGROUND The site is an active Circle K Facility 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 m the area of the new UST pit and transported to Forward Landfill in Manteca for disposal In addition, approximately 17,000 gallons of hydrocarbon-impacted groundwater were removed from the new UST pit and transported to a permitted facility for treatment Soil samples collected from beneath, the former UST complex were reported to contain concentrations of total petroleum hydrocarbons as gasoline (TPH-g) ranging from 130 to 5,800 milligrams per kilogram (mg/kg) Benzene was reported m two of the six samples 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