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t <br /> mam <br /> Pro ect 30910.1 July 3I, 1991 <br /> Wiggins & Associates, Stockton, California / J <br /> sequence was performed for background information regarding the <br /> site's soil lithology• Soil samples were recovered from Borings B- <br /> 4 and B-S 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 /> Details of the materials encountered in the soil borings 20 faere <br /> presented in Attachment 1. Sol <br /> encountered � the <br /> h s nd Grey' <br /> were primarily brown, <br /> low to medium plastic, clayey <br /> brown, non-plastic, medium-grain sands were encountered at the 20 <br /> to 25 foot depths. In Borings B-1, B-3, B-7, 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 /> r soils changed back to the clayey sand sequence (described above) • <br /> CHEMICAL ANALYSIS OF SOIL sAKPLES <br /> .y 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 lithologic changes or water saturated <br /> zones. Soil samples selected for chemical analysis were <br /> s 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 /> / San Pablo, California <br /> TMC Environmental, Inc. <br /> S of 12 <br /> c Y»i <br />