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KLEINFELD ER Wastewater is generated throughout the plant primarily from wet mill maceration of vegetables, surface spillage, clean in place solution, and evaporates. The wastewater is collected and pretreated by screening, pH adjustment, dissolved air flotation, biological treatment (trickling filter), coagulation and flocculation in the lamella separator. Wastewater is pumped to the Manteca Wastewater Treatment Plant,hauled offsite, or discharged to the land. 2.3 REGIONAL GEOLOGY AND HYDROGEOLOGY The site lies within the Great Valley Geomorphic Province of California. The valley is approximately 400 miles long and averages about 50 miles wide, and comprises about 20,000 square miles. The valley has been filled with a thick sequence of marine and non-marine sediments from the late Jurassic to Holocene. The uppermost strata of the Great Valley represents, for the most part, the alluvial, flood, and delta plains of two major rivers (Sacramento and San Joaquin Rivers) and their tributaries. The valley deposits are derived from the Coast Ranges to the west and the Sierra Nevada to the east. Granitic and metamorphic rocks outcrop along the eastern and southeastern flanks of the valley. Marine sedimentary rocks outcrop along most of the western, southwestern, southern, and southeastern flanks; and volcanic rocks and deposits outcrop along the northeastern flanks of the valley. The valley geomorphology includes dissected uplands, low alluvial plains and fans, river flood plains and channels, and overflow lands and lake bottoms. The majority of the native sediments near the site consist of Miocene to Holocene continental rocks and deposits of a heterogeneous mixture of generally poorly sorted clay, silt, sand and gravel. Based upon the San Joaquin County Flood Control and Water Conservation District, Spring 1999 Groundwater Report, groundwater in the vicinity of the site was anticipated to occur approximately 15 feet below existing grade. The regional direction of groundwater flow varies throughout the site showing a northeast/east direction in the Rapid infiltration Area and a western direction in the Louise Avenue Infiltration Area.. Groundwater depth and flow direction may be influenced by local pumping, rainfall, and irrigation patterns. Evaluation of such factors is beyond the scope of this assessment. Variations of this sort may lead to localized groundwater flow that may go in virtually any direction. With the nearby groundwater extraction at Sharpe Army Depot, local irrigation well pumping and recharge at California Natural Products (CNP) and other nearby properties, groundwater flow beneath CNP has shown other flow directions. Based on the Nolte monitoring well survey, and water level measurements made by CNP and Kleinfelder personnel According to a recent file review of Sharpe Army Depot records on file with the California State Department of Toxic Substances Control, Sharpe has eight extraction wells for withdrawal of the shallow (A-Zone) water within approximately 1200 feet of the northeast 20-4587-02.WP2/2002R489 Page 3 of 12 Copyright 2002,Kleinfelder,Inc. June 6,2002