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Wiggans & Assoc-Cates, Stockton, Calafornaa / Project 309101 July 31, 1991 <br /> • sequence was performed for background information regarding the <br /> r <br /> site' s soil lithology. Soil samples were recovered from Borings B- <br /> 4 and B-8 at approximately 2-1/2 feet below grade; believed to be <br /> near the bottom limits of the product piping runs. In Borings B-2 <br /> and B-5, soil samples were recovered from 5-1/2 feet below grade. <br /> SOIL STRATIGRAPHY <br /> w Details of the materials encountered .in the soil borings are <br /> presented in Attachment Z . Soils encountered in the top 20 feet <br /> were primarily brown, low to medium plastic, clayey sands. Grey- <br /> brown, non-plastic, medium-grain sands were encountered at the 20 <br /> to 25 foot depths. In Borings B-1, B-3, B-71 B-9, soils with <br /> moderate to strong petroleum--like odors were encountered at the 25 <br /> to 27 foot depths, near the soil - ground water interface. At the <br /> 30 foot depth (approximate bottom limits of the deeper borings) , <br /> soils changed back to the clayey sand sequence, (described above) . <br /> CHEMICAL ANALYSIS OF SOIL. SAMPLES <br /> Soil samples selected for chemical analysis were collected from <br /> materials that appeared to be stained or had petroleum-like odors, <br /> or from materials at or near lxthologic changes or water saturated <br /> zones. Soil samples selected for chemical analysis were <br /> transported to Curtis and Tompkins, Limited, located in Berkeley, <br /> California. The samples were chemically analyzed for Total <br /> Volatile Hydrocarbons as Gasoline (TVH Gas) , Benzene, Toluene, <br /> Ethyl Benzene, and Total Xylenes (BTEX) , and/or Kerosene and <br /> Diesel. <br /> TMC Environmental, Inc. / San Pablo, California 6 of 12 <br />