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h� KLEINFELDER <br /> 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 two documents prepared for Spreckels <br /> Sugar by Kenneth D. Schmidt, Groundwater Quality Consultant (Schmidt 1985 and Schmidt <br /> 1993). The documents are technical reports on groundwater monitoring efforts associated with <br /> the wastewater, lime and mud ponds on site. According to Mr. Schmidt, coarse-grained alluvial <br /> deposits, primarily fine to medium grained sand, are present to a depth of at least 60 feet below <br /> grade. Localized clay strata are also present in the upper 60 feet. Additionally, two major clay <br /> layers are present beneath the site at approximate depths of 95 to 141 feet, and 188 to 243 feet. <br /> Mr. Schmidt identifies the deeper clay layer (188 to 243 feet) as the Corcoran Clay, a major <br /> regional confining bed that occurs along the west side of the San Joaquin Valley. <br /> Water level information was also obtained from the Schmidt groundwater reports in addition to <br /> numerous Kleinfelder documents. Generally, during the period of the monitoring (1992 to date) <br /> the groundwater elevation beneath the former Spreckels factory site ranged from 17 to 28 feet <br /> above mean sea level. The direction of groundwater flow was predominantly to the west- <br /> northwest. Historical groundwater information obtained by Mr. Schmidt indicates that in 1950 <br /> depth to groundwater beneath the factory was 10 feet with a direction of groundwater flow to the <br /> west. Depth to groundwater in the vicinity of the site has historically ranged from 10 to 30 feet <br /> below grade, with groundwater flow directions varying from due west to northwest. <br /> The majority of the native sediments near the site consist of Miocene to Holocene continental <br /> rocks and deposits of a heterogeneous mixture of generally poorly sorted clay, silt, sand and <br /> gravel. Some beds of claystone, siltstone, sandstone, and conglomerate are also present. <br /> The general direction of groundwater flow in the area of the site, based on a report issued by the <br /> San Joaquin County Flood Control and Water Conservation District, Spring 1995, and is to the <br /> northwest. The elevation of first groundwater is approximately 20 feet below mean sea level. <br /> According to the same report, the depth to groundwater in the vicinity of the project site is <br /> approximately 20 feet below grade. <br /> 3.0 BACKGROUND <br /> Kleinfelder has conducted a Phase I Environmental Site Assessment (ESA) of the property <br /> known as the Former Spreckels Sugar Plant in Manteca, California (Kleinfelder Job No. 20- <br /> 3978-OLP01, dated October 18, 1996). The following process description was compiled during <br /> that assessment. Plate 1 shows the location of the Spreckels property. <br /> 20-Y PO-273/2000P331/2000 W 034 Page 3 of I I <br /> Copyright 2000, Kleinfelder,Inc. September 4,2000 <br />