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KLEINFELDER EXPECT 11ORE' the proposed ponds and larger application areas and to supplement the existing monitoring well network. The proposed wells are also designed and sited to monitor upgradient and downgradient shallow groundwater quality after holding and application of tertiary effluent begins. The new network will consist of nine (9) additional wells which will be constructed in the first encountered shallow groundwater underlying the site (See Plate 1). The sampling and analyses of the additional monitoring wells will reflect the RWQCB's monitoring and reporting program for the site under Waste Discharge Requirement (WDR) Order No. R5-2006-0114. 1.2 LOCAL GEOLOGIC AND HYDROGEOLOGIC CONDITIONS The site lies near the western boundary of 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 represent, 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. Some beds of claystone, siltstone, sandstone, and conglomerate are also present. Review of the California Division of Mines and Geology "Geologic Map of the San Francisco — San Jose Quadrangle," indicates that the site is underlain by Quaternary alluvial fan deposits. According to the San Joaquin County Flood Control and Water Conservation District (SJCFCD), Spring 1999, Groundwater Report, the depth to groundwater in the area of the subject site is approximately 10 feet below the ground surface (bgs), as shown by the Lines of Equal Depth to Groundwater Spring 1999 map from the report. The Lines of Equal Elevation of Groundwater, Spring 2003 map shows the elevation of groundwater to be 0 feet above mean sea level (msl) with a groundwater flow direction west by northwest. It should be noted that the San Joaquin County Flood Control and Water Conservation District has not published a depth to groundwater report map since Spring of 1999. 48093.E01/ST07R052/CJC/Iv Page 2 of 15 ©2007 Kleinfelder, Inc January 26, 2007