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Harding Lawson Associates <br /> ' surface to depths ranging from 2 to 13 feet (Plates 3-5). In general, the coarse- <br /> grained units thin towards the south. <br /> The fine-grained sediments can be divided into two distinct units. The first <br /> ' unit ranges in color from blue-grey and gray-green to black, and is predominantly <br /> composed of silty clay, clayey silt, and organic clay, with minor sand and silty- <br /> sand lenses. The second unit is a yellow-brown to brown silty clay. The yellow- <br /> brown unit is seen only in the northwestern portion of the site, and is overlain by <br /> the gray-green to black unit. <br /> November 24, 1987 3 of 9 <br /> ' B2203-R <br />