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' h4 KLEINFELD ER <br /> 3 GEOLOGY AND HYDROGEOLOGY <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 Siena 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 /> 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 /> 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 regional groundwater flow in the area of the site, based on a reports <br /> issued by the San Joaquin County Flood Control and Water Conservation District are <br /> summarized in the following table <br /> Table 1 <br /> ' Regional Groundwater Elevation and Flow Data <br /> California Natural Products Facility <br /> Lathrop, California <br /> Date Ground- Approximate Depth to Flow llirection of Groundwater <br /> of County Map Water Elevation of Groundwater (based on County Map) <br /> t Data Elevation Property (calculated <br /> (from County (from Nolte from prior 2 <br /> Map) survey) columns) <br /> Spring 1997 5 feet msl 20 feet msl 15 feet bgs North-Northwest <br /> Spring 1998 8 feet msl 20 feet msl 12 feet bgs Northwest <br /> Fall 1998 3 feet msl 20 feet msl 17 feet bgs West <br /> Spring 1999 8 feet msl 20 feet msl 12 feet bgs Northwest Ell <br /> ' msl mean sea level <br /> bgs below ground surface <br /> ' 211-4587-01.W P I/201 I P 128 Page 3 of 12 <br /> ' Copyright 2001,Kleinfelder, Inc. May 8,2001 <br />