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r <br /> BASELINE ASSESSMENT REPORT <br /> Site Number 11194 <br /> 2375 Tracy Boulevard <br /> Tracy, California <br /> 4. Supplemental Site Assessment Work <br /> EMCON personnel conducted supplemental assessment activities at the site on November 17, <br /> 1994 These activities consisted of advancing three exploratory soil borings (THP-1 through <br /> THP-3) to 13 feet bgs by using CPT equipment, and collecting soil and groundwater samples <br /> from the borings In addition, EMCON collected a groundwater sample from two UST <br /> complex observation wells, and collected grab samples from beneath three of the four fuel <br /> dispensers (Figure A-1) THP-1 was advanced north of the UST complex, THP-2 was <br /> advanced between the UST complex and the western pump Island, and THP-3 was advanced <br /> north of the northwest corner of the station building CPT equipment was used to collect soli <br /> samples from each boring HydroPunchTM equipment was used to collect groundwater <br /> samples from each boring <br /> Solt types encountered during boring activities primarily consisted of gravel and sandy gravel to <br /> the total depths explored, sandy slit was encountered from 10 to 12 feet bgs 1n THP-2 <br /> Groundwater was encountered at approximately 8 feet bgs A PID was used to screen soil <br /> samples collected from each boring A reading of 101 ppm was measured from a soil sample <br /> collected from THP-2 at 11 feet bgs Because of the gravelly nature of the subsurface <br /> lithology, collection of soil samples was considerably limited Consequently, analyses for soil <br /> samples from THP-1 through THP-3 were not performed <br /> Groundwater samples collected from each boring were submitted for TPH-G, TPH-D, <br /> TPH-O, BTEX, and HVOC analyses Laboratory results indicated that the sample from <br /> THP-2 contained TPH-G (5,800 ppb), TPH-D (2,500 ppb), TPH-O (340 ppb), benzene <br /> (14 ppb), ethylbenzene (77 ppb), and total xylenes (51 ppb) (Table A-1) The samples from. <br /> THP-1 and THP-3 contained TPH-O (540 ppb and 300 ppb, respectively) Components <br /> eluting in the range of mineral spirits (150 ppb) were detected in the groundwater sample <br /> collected from THP-2 HVOCs were not detected in the groundwater samples from soil <br /> borings <br /> . $/roS1RPT/11194RPT d12-941JU/srnw 6 Rev 0 02/03/95 <br /> 0952-09203 <br /> I <br />