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r <br /> r <br /> r4.0 FIELD INVESTIGATION PROGRAM <br /> The Treadwell & Rollo field investigation program included collecting and analyzing soil and <br /> groundwater grab samples and documenting subsurface stratigraphy and groundwater conditions <br /> The soil and groundwater grab data were collected to provide information on the nature and <br /> extent of contamination <br /> 1 <br /> 4.1 Utility Clearance and Permitting <br /> Drilling locations were cleared for the underground utilities by the Underground Services Alert <br /> ' (USA) system and the California Utility Surveys of San Ramon, California, a private utility <br /> locator The appropriate drilling permits were obtained from the San Joaquin County <br /> Environmental Health Department(SJCEHD) An encroachment permit was obtained from the <br /> City of Tracy for the borings located on the sidewalk of West Grant Line Road In addition, we <br /> obtained drilling access to the Tracy Express Wash & Lube site from Mr Rudy Sanchez, the <br /> property owner <br /> 1 <br /> 42 Exploratory Borings <br /> ' A total of 27 borings, designated TR-1 through TR-27, were drilled between 22 and 24 <br /> September 2003 as shown on Figure 3 Sixteen borings (TR-1 through TR-16)were located on <br /> ' the 541 Site to assess the potential presence of surface spills and/or onsite sources of <br /> groundwater contamination, to collect data comparable with past investigations, and to gather <br /> ' additional information on the magnitude and extent of soil and groundwater contamination Five <br /> borings (TR-17 through TR-21) were drilled within the City of Tracy property and six borings <br /> ' (TR-22 through TR-27) were located on the Tracy Express Wash & Lube property to <br /> characterize the potential offsite contributions to groundwater contamination <br />� 1 <br /> The borings were drilled by Vironex of San Leandro, California using a Model 5400 geoprobe, <br /> mounted on either a bobcat or truck The borings were advanced using a2-inch diameter <br /> . direct-push coring device The borings were drilled to total depths ranging from S to 19 feet bgs <br /> 1 <br /> Field Investigation Report g 8 December 2003 <br /> ' TREADWELL&ROLLO,INC <br />