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Working To Restore Nature <br /> ' Report on Vapor Extraction Test January 29, 1993 <br /> Coca-Cola Former Distribution Facility, Stockton, California 54006.01 <br /> Inc of Patterson, California The tanks were transported to Levi's Iron and Metal Company <br /> in Fresno, California to be cut up and recycled The excavated soil was aerated onsite in <br /> accordance with San Joaquin County Air Pollution Control District requirements (USTEC, <br /> June 1990) The excavation was backfilled with clean, imported sand and resurfaced with <br /> 6-inches of concrete <br />' Two soil samples were collected at each end of the diesel tank, and two samples at each end <br /> of the gasoline tank, and submitted for laboratory analysis At the diesel tank, total <br /> petroleum hydrocarbons as diesel (TPHd) were nondetectable in one sample and 32 parts <br /> per million (ppm) in the second sample Total petroleum hydrocarbons as gasoline (TPHg), <br /> and the petroleum hydrocarbon constituents benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX) were nondetectable <br /> Two soil samples were collected at each end of the gasoline tank TPHg was 2,000 ppm in <br />' one sample, and 3,600 ppm in the other BTEX ranged from 6 6 ppm to 200 ppm (total <br /> xylenes) TPHd was nondetectable in one sample and 180 ppm in the other After the <br /> report of this work was completed, a Work Plan for an additional subsurface investigation <br /> was submitted to the San Joaquin County Environmental Health Division (USTEC, August <br /> 1990) <br />' Soil Gas Survey <br /> In May 1990 a soil gas survey was conducted by USTEC to assist in determining the <br /> locations of proposed groundwater monitoring wells and soil borings (USTEC, October <br /> 1990) Twenty-eight soil probe vapor points were sampled for concentrations of petroleum <br /> hydrocarbons Soil gas TPHg concentrations ranged from nondetectable to 90 ppm, weight <br /> to volume The majority of vapors appeared to be located immediately south of the former <br /> gasoline UST <br />' initial Subsurface Investigation <br /> In August and September 1990, a subsurface environmental investigation was conducted by <br /> USTEC (USTEC, November 1990) A total of thirteen soil borings (B-1 through B-13)were <br /> drilled and five groundwater monitoring wells (MW-1 through MW-5) were installed in five <br />' of the borings The locations of the soil borings and groundwater monitoring wells are <br /> shown in Plate 3 The borings and wells were drilled to depths ranging from 70 to 95 feet <br /> below ground surface Groundwater was encountered at a depth of about 70 feet <br /> 3 <br />