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• <br /> Geologicaf Technics Inc. <br /> 2741 Yjvtr Rgad <br /> Moduto,C4fomra 95351 <br /> (209)538.64241FW 538-5852 <br /> Report <br /> Subsurface Investigation <br /> Sinclair Trucking <br /> 3780 West Linne Road <br /> Tracy, California <br /> ' Project No. 320.2 <br /> September 27, 1995 <br /> EXECUTIVE SUMMARY <br /> ' On June 14, 1995, Geological Technics Inc. personnel supervised and directed a <br /> subsurface investigation at Sinclair Trucking located at 3780 West Linne Road in <br /> Tracy California. A total of three groundwater monitoring wells were installed and <br /> one soil boring was advanced to evaluate the vertical and lateral extent of gasoline <br /> range petroleum hydrocarbons. The depth to groundwater was measured and <br /> groundwater samples were collected on June 23, 1995. The groundwater was shown <br /> to flow generally east northeast. Laboratory analytical data has shown that both the <br /> soil and groundwater environments in the vicinity of the former UST are impacted <br /> ' by gasoline. <br /> 1.0 SUBSURFACE INVESTIGATION <br /> t1.1 Soil Boring <br /> ' One soil boring was advanced into the saturated zone (TD-25') with a truck mounted <br /> drilling rig using a 8.00 inch outside diameter continuous flight hollow stem auger <br /> owned and operated by V&W Drilling (C57# 658786). This boring was originally <br /> ' intended to be converted into a groundwater monitoring well but field screening <br /> methods suggested that this location was impacted by petroleum hydrocarbons. <br /> Therefore this boring was abandoned by pumping a neat cement grout with a tremie <br /> ' pipe and slurry pump. A second boring was drilled further away in the same <br /> general direction in an effort to define the lateral extent. This boring was converted <br /> into a groundwater monitoring well as described below. Soil cuttings were <br /> ' underlain and covered with plastic. <br />