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i <br /> i <br /> i 4 <br /> Geologicaf Technics Inc. <br /> 2741 River Road i <br /> Mxk,to,California 95351 <br /> (209)538-6424/faX#538-5852 <br /> Report <br /> i <br /> Soil & Groundwater Investigation <br /> City of Escalon <br /> Former Arco Gas Mini Mart <br /> 1350 Escalon Ave. <br /> Escalon, CA <br /> LI Project No. 750.2 <br /> March 15, 1999 <br /> EXECUTIVE SUMMARY <br /> The site is located at 1350 Escalon Ave, Escalon, California in the Highway 120/1\4cHenry <br /> Avenue Improvement Project. Figure 1 is a location map and Figure 2 is a site map. This <br /> property was previously an Arco Gas and Mini Mart. <br /> Previous work at this site includes two limited soil borings, soil sample analysis, and the (D\J _X� <br /> removal of the USTs and pump islands. During removal activities, soil samples were <br /> collected which showed the presence of BTEX, TPH-G and MTBE. <br /> On February 12 & 23, 1999 Geological Technics Inc. (GTI) drilled six boreholes, collected <br /> soil and groundwater samples (including one groundwater sample from each borehole via <br /> hydropunch methods) and tested these samples for petroleum hydrocarbons. <br /> 1.0 SOIL & GROUNDWATER INVESTIGATION <br /> To further investigate the lateral and vertical extent of soil and groundwater impacted with <br /> petroleum hydrocarbons, GTI drilled six boreholes around the former pump islands. <br /> Groundwater grab samples were collected from each borehole with a Hydropunch type <br /> sampling tool. Figure 2 is a site map showing the locations of the borings. <br /> 1.1 Soil Borings <br /> The borings were drilled using an 8.00-inch outside diameter continuous flight hollow stem <br /> auger owned and operated by V&W Drilling (C57# 720904). The subsurface had previously <br /> been cleared of underground utilities by notifying Underground Service Alert. <br /> On February 12, 1999 three boreholes were drilled on site (HP-1, HP-4 & HP-5). The <br /> boreholes were extended to the capillary fringe. A Hydropunch type sampling tool was then <br /> advanced into the ground water to obtain a ground water sample. The depth to groundwater <br /> cy in this area was approximately 60-61 feet below grade. <br /> I`' <br />