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KLEINFELDER <br /> f <br /> 1. INTRODUCTION <br /> I ' <br /> 1.1 SITE LOCATION AND HISTORY <br /> The Disco Site is located at the southeast corner of Filbert Avenue and Myrtle Streets in <br /> Stockton, California (see Plate 1). The address of the plant is 110 Filbert Street, Stockton, <br /> California. The site is located in Section 6 (extrapolated), Subsection M, Township 1 North <br /> Range 7 East, Mount Diablo Base and Meridian. <br /> The site lies within the Great Valley Geomorphic Province of California. The valley is <br /> approximately 400 miles long and averages about 50 miles wide, and comprises about 20,000 <br /> square miles. The valley has been filled with a thick sequence of marine and non-marine <br /> sediments from the late Jurassic to Holocene. The uppermost strata of the Great Valley <br /> represents, for the most part, the alluvial, flood, and delta plains of two major rivers (Sacramento <br /> and San Joaquin Rivers) and their tributaries. <br /> The valley deposits are derived from the Coast Ranges to the west and the Sierra Nevada to the <br /> east. Granitic and metamorphic rocks outcrop along the eastern and southeastern flanks of the <br /> valley. Marine sedimentary rocks outcrop along most of the western, southwestern, southern, <br /> J and southeastern flanks; and volcanic rocks and deposits outcrop along the northeastern flanks of <br /> the valley. The valley geomorphology includes dissected uplands, low alluvial plains and fans, <br /> river flood plains and channels, and overflow lands and lake bottoms. <br /> Site specific geologic information was obtained from a document prepared for Del Monte by <br /> CH2M Hill titled, "Additional CPT Investigation and Monitoring Well Installation Report, Del <br /> Monte Disco Property, Stockton, California" (dated March 2002), and past documents pertaining <br /> to the installation of other monitoring wells on the site. According to the CH2M Hill reports, the <br /> site is underlain by unconsolidated alluvial sediments. The soils encountered during subsurface <br /> investigations show clay, silt, sand, and gravel. The predominant soils are interbedded sandy <br /> clay and silty sand. The majority of the native sediments near the site consist of Miocene to <br /> Holocene continental rocks and deposits of a heterogeneous mixture of interbedded, generally <br /> poorly sorted clay, silt, sand and gravel. M erdw c wwwW­s l <br /> Water level information was also obtained from the CH2M Hill groundwater reports. Generally, <br /> during the period of the monitoring (1995 to date) the groundwater elevation beneath the project <br /> site has been -20 feet in reference to mean sea level (msl). The direction of groundwater flow <br /> has been predominantly to the southeast. Historical groundwater information obtained by CH2M <br /> Hill indicates that in 1991 groundwater elevation beneath the site was approximately-53 feet msl <br /> with a direction of groundwater flow to the northwest. Due to ceasing the operation of three Del <br /> Monte production wells and numerous city municipal wells in the area the groundwater elevation <br /> { has risen approximately 33 feet to its present elevation. <br /> 12280/2002R476 Pagel of 26 <br /> E Copyright 2002 Kleinfelder,Inc. May 17,2002 <br />