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Cwtogccal Technics Inc. <br /> 2741 River Road <br /> Modesto.California 95351 <br /> (209)538-6424/Fax#538-5852 <br /> Irk 1 <br /> "PORT <br /> 1 <br /> SOIL & GROUNDWATER INVESTIGATION <br /> Payless Shoe Store <br /> 1160 W. Yosemite Avenue Ave. <br /> Manteca, CA " <br /> Project No. 959.2 <br /> September 7, 2001 <br /> f <br /> EXECUTIVE U IVE SUMMARY <br /> A Payless Shoe Store is currently located at 1160 W. Yosemite Avenue in Manteca, <br /> California (see Figure 1). A portion of a former Shell gasoline station waspreviousl <br /> located at the site. The purpose of this investigation is to determine if gasoline has been <br /> released from underground fuel storage systems at the site. <br /> On August 16, 2001, V&W Drilling (C57#720904) installed four GeoProbe soil borings at <br /> the site. Geological Technics Inc. personnel were on site to collect soil and groundwater <br /> samples, log the boreholes and supervise the borehole installation. <br /> The borings were installed to a depth of 22 to 24 feet below ground surface (bgs),- <br /> Groundwater was encountered at approximately 18 feet bgs. Soil samples show the <br /> {� presence of BTEX and gasoline range petroleum hydrocarbons in one of the four boreholes. <br /> Groundwater samples show the presence of BTEX and gasoline range petroleum <br /> hydrocarbons in three of the four boreholes. , <br /> 1.0 SCOPE OF INVESTIGATION <br /> On August 16, 2001, Geological Technics Inc. supervised the drilling of 4 boreholes using <br /> GeoProbe direct push method to investigate the extent of soil and groundwater impacted by <br /> petroleum hydrocarbons. <br /> 1.1 Borehole Drilling & Soil Sample Collection <br /> The Site Map in Figure 2 shows the locations that the boreholes were drilled. <br /> The boreholes were drilled with a GeoProbe rig owned and operated by.V&W Drilling of <br /> J Rio Vista, CA (C57# 720904). The GeoProbe advances a continuous coring tool with a <br /> * pneumatic hammer to a selected depth. The soil sample enters an acetate cylinder contained <br /> in the coring tool. Upon filling, the coring tool is pulled from the hole and the cylinder is k <br /> removed. The cylinder is then cut and the,selected' interval is preserved for laboratory <br /> h <br /> 1 <br />