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I <br /> Alm <br /> Working To Restore Nature <br /> Addendum One to Remedial Action Plan March 1, 1993 <br /> Coca-Cola Former Distribution Facility, Stockton, California 54006.01 <br /> PREVIOUS WORK <br /> The reports of previous environmental work at the subject site are referenced in the <br /> References section of this report, and summarized below. <br /> Tank Excavation <br /> On April 19, 1990, Crisp Construction of Visalia, California,under the supervision of Quinn <br /> and Quinn Enterprises, Inc. also of Visalia, excavated and removed one 10,000 gallon <br /> underground diesel tank, one 1,000 gallon underground gasoline tank and associated piping <br /> and fuel dispensers. Environmental sampling for the UST removal was conducted by U.S. <br /> ' <br /> Technical Environmental Consulting, Inc. (USTEC, June 1990). The 10,000 gallon tank <br /> showed no visible holes or severe corrosion. The 1,000 gallon gasoline tank, however, <br /> showed severe signs of corrosion, and one 1/2-inch diameter hole was found in the wall of <br /> ' the tank. Rinsate from the tanks was manifested and treated offsite at Refineries Service, <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). <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 /> I <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 /> A-1 <br />