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ATC Associates Inc. <br /> V � 1117 LZS'ne Palm Avenue, Suite 201 <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> fax: 209-579-2225 <br /> Summary of <br /> Supplemental Subsurface Investigation <br /> at <br /> Tracy Truck & Auto Stop <br /> 3940 North Tracy Boulevard <br /> Tracy, California <br /> ATC Project No. 54.39426.0001 <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc. (ATC) has prepared this Summary of Supplemental Subsurface <br /> Investigation on behalf of Charanjit S. and Davinder K. Jutla for the above referenced site. This <br /> work was performed at the direction of the San Joaquin County Environmental Health <br /> Department (SJCEHD) in correspondence dated November 17, 2009, <br /> 2.0 SITE DESCRIPTION <br /> The site is located on the corner of Tracy Boulevard, which is to the west, and W. Larch Rd. <br /> which is to the south near the northern border of the developed portion of the incorporated city <br /> of Tracy, California (Figure 1). The site is located in an area transitioning between rural and <br /> commercial/industrial uses with both commercial/industrial development and open spaces <br /> located nearby. An undeveloped parcel lies to the north and commercial development to the <br /> south and east (Figure 2). <br /> 3.0 PREVIOUS ENVIRONMENTAL WORK <br /> It is ATC's understanding that during a recent fuel dispenser upgrade at the site, diesel <br /> impacted soil was detected. Advanced GeoEnvorinmental collected seven soil samples, B11 <br /> through B17 at five feet bgs (Table 1). Subsequently an underground storage tank unauthorized <br /> release/contamination site report was filed. SJCEHD subsequently issued a directive to <br /> conduct an investigation to further evaluate the extent of impact. A workplan dated November <br /> 17, 2009 was prepared in response to the directive but the scope of work was scaled back after <br /> a discussion with Mr. Harlin Knoll of SJCEHD. <br /> 4.0 SOIL BORING ADVANCEMENT <br /> 4.1 Geoprobe Drilling Activities <br /> Drilling was conducted on December 1, 2009, by Vironex, Inc. (State C57 license No. 710079) <br /> utilizing a Geoprobe TM drill rig. Borings SB1 through SB3 were advanced to approximately 20 <br /> feet. A field geologist logged drill cuttings and soil samples utilizing the Unified Soil <br /> Classification System. <br /> S Tnviromental\39426\repons\Subsurface inv.doc 1 <br />