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BASELINE ASSESSMENT REPORT <br /> Site Number 11193 <br /> 3202 West Hammer Lane <br /> Stockton, California <br /> 4. Supplemental Site Assessment Work <br /> EMCON conducted supplemental assessment activities at the site on November 22, 1994. <br /> These activities consisted of collecting two grab soil samples (TD-2 and TD-3) below the <br /> eastern fuel dispensers at the north and south pump islands, drilling three soil borings (THP-1, <br /> THP-2, and VW-1) to approximately 17 to 26.5 feet bgs by using hollow-stem auger <br /> equipment, and collecting soil and groundwater samples from the borings. The borings were <br /> located near the UST tank complex and the waste oil UST (Figure A-1). Soil types <br /> Y encountered during drilling included sandy silt, sand, and silt to the total depths explored. <br /> �v Groundwater was encountered at approximately 25 feet bgs during drilling in boring THP-1 <br /> and at approximately 21 feet bgs in boring THP-2. Groundwater samples were collected from <br /> THP-1 and THP-2 by using HydroPunchrm sampling technologies. Boring VW-1 was <br /> installed as a vapor extraction well within the vadose zone to 17 feet bgs and above the water <br /> table. PID readings from soil samples collected from borings and dispenser grab samples <br /> ranged from nondetect to 180 ppm Copies of the boring logs (THP-1 and THP-2 are referred <br /> to as HP-1 and HP-2)are included in Attachment D. <br /> Two dispenser grab samples (TD-2 and TD-3) and two soil samples from borings THP-1 and <br /> THP-2 from 10 and 15 feet bgs were submitted for laboratory analysis of TPH-G, TPH-D, <br /> TPH-O, and BTEX. One additional soil sample from boring THP-1 at 15 feet bgs was <br /> submitted for laboratory analysis for HVOCs. THP-G(up to 2,100 ppm), ethylbenzene(up to <br /> 18 ppm), and total xylenes (up to 110 ppm) were detected in soil samples collected from <br /> beneath the dispensers (TD-2 and TD-3; Table A-1). Toluene (3.5 ppm) was also detected in <br /> sample TD-3. TPH-D(1 ppm)was detected in the soil sample collected from boring THP-1 at <br /> 10 feet bgs, and benzene (0.03 ppm) was detected in the soil sample collected from THP-2 at <br /> 15 feet bgs. Soil samples from boring VW 1 were not analyzed. <br /> Groundwater samples collected from HydroPunch borings THP-1 and THP-2 were submitted <br /> for laboratory analyses for TPH-G, TPH-D, TPH-O, BTEX, and HVOCs. TPH-G (up to <br /> 6,900 ppb) and benzene (up to 1,900 ppb) were detected in groundwater samples collected <br /> B =RPT/lI193RPT.n29-941JLT/ch:4 <br /> Rey.o,02/03/95 <br /> 0952-091.03 <br /> l <br />