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1 <br /> Geofogicaf Technics Inc. <br /> ' 2741 River.-,V r <br /> Modesto,CaCfomia 95351 <br /> (209)538-6424IFax#538-5852 <br /> ' <br /> Report <br /> po t <br /> ' Subsurface Investigation <br /> Sinclair Trucking <br /> 3780 West Linne Road <br /> Tracy, California <br /> ' Project No. 320.2 <br /> July 21, 1999 <br /> EXECUTIVE SUMMARY <br /> ' On February 16, 1999, Geological Technics Inc, personnel supervised and directed a <br /> subsurface investigation at Sinclair Trucking located at 3780 West Linne Road in Tracy <br /> California. One groundwater monitoring well was installed down gradient of the former UST <br /> to further define the lateral extent of gasoline contamination in the soil and groundwater. <br /> The well was developed on February 17, 1999 and a groundwater monitoring event was <br /> ' performed on February 19, 1999. The groundwater is approximately 11 feet below grade and <br /> was shown to flow generally east northeast. Laboratory analytical data shows the following: <br /> • Both the soil and groundwater environments in the vicinity of the former UST are <br /> impacted by gasoline. <br /> ' • Elevated concentrations of contamination extend downgradient in the sand unit between <br /> 12 to 16 feet below ground surface. <br /> • Below 16 feet the soil is clean. <br /> • Above 12 feet, only slight concentrations of gasoline occur in the soil. <br /> • MW-2 & 3 are free of contamination. While both MW-1 & 4 contain low to moderate <br /> levels of contamination. <br /> 0 MTBE and the other oxygenated fuel compounds were tested for and not found. <br /> 1.0 SUBSURFACE INVESTIGATION <br /> 1.1 Soil Boring <br />' One soil boring was advanced into the saturated zone (TD-25') with a truck mounted drilling <br /> rig using a 8.00 inch outside diameter continuous flight hollow stem auger owned and <br /> operated by V&W Drilling (C57# 658786). This borehole was converted into a groundwater <br /> monitoring well as described below. Soil cuttings were underlain and covered with 6-mil <br />' plastic sheeting. <br />