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KLEINFELDER <br /> 3 WASTE MANAGEMENT UNIT CHARACTERISTICS <br /> 3.1 GEOLOGY AND TOPOGRAPHY <br /> The J-M Mfg. facility is located near the center of the Great Valley of California. The marine <br /> sediments of the Great Valley were deposited approximately 35 to 150 million years ago. This <br /> sequence of marine clays, silts, and sands is approximately 6,000 feet thick under the site, <br /> resulting in a very flat topography throughout the area, including the J-M Mfg. site <br /> (Drawing 1). <br /> 3.2 TYPE, SIZE AND LOCATION OF WMUS <br /> Table 3-1 summarizes the type and size of WMUs at the J-M Mfg. site. Plate 2-1 shows the <br /> location of the individual WMUs. Information regarding WMUs locations and sizes were <br /> derived from a combination of different information sources. An initial investigation into the <br /> WMUs was the subject of the June 27, 1990 SWAT report. Aerial photographs from years <br /> 1963, 1973, 1975, 1979, 1984, 1985 and 1986 were reviewed and interpreted to find various <br /> landfill zones during various phases of landfilling operation at the J-M Mfg. site. <br /> The limits of landfill zones were later refined following a limited surface soil sampling dated <br /> August 7, 1990, the Kleinfelder Interim Soil Investigation in November 1991, and discussions <br /> with members of the J-M Mfg. staff who were present when landfilling occurred. During the <br /> SWAT investigation, a geophysical survey of the site using a Geonics EM-31 terrain <br /> conductivity meter was conducted. Results from this survey were used to refine estimates of <br /> the landfill boundaries. — <br /> Surface soil samples were collected and the location of the samples were marked with aerial <br /> targets. This allowed the sample locations to be included in the aerial photography to locate the <br /> sample points. <br /> CR14-92-12 Page 7 of 39 24-220109-F09 <br /> Copyright 1992 Kleinfetder, Inc. <br />