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2 SITE SETTING <br />2.1. SITE LOCATION <br />KL1=iNFELDER <br />The site is located at 200 North Beckman, which runs parallel and east of Highway 99 and just <br />south of Highway 12 eastbound (Victor Road), in Lodi, California. The site is situated in <br />Subsection M of Section 6, Township 3 North, Range 7 East, Mount Diabio Baseline and <br />Meridian according to the Lodi North 7.5 Minute Topographic Map (1968, Photorevised 1976). <br />2.2. CURRENT SITE USE <br />The subject site is a San Joaquin County Mosquito & Vector Control District (SJC/MVCD) <br />facility. The site includes a working office, open shed, former wash down area, and non <br />operating small retention basins. A former Shell Gas Station is located north of the site and a <br />trucking yard east of the site. CalTrans maintenance station is located south of the site. <br />Beckman Road is located adjacent and west of the property beyond which is Highway 99. <br />2.3. 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 Periods. The uppermost strata of the Great Valley <br />represent, 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 eastem 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, overflow lands, and lake bottoms. <br />According to San Joaquin County Flood Control and Water Conservation District (SJCFCWCD) <br />maps, dated Spring 1999, depth to groundwater in the vicinity of the site is approximately 65 feet <br />bgs. SJCFCWCD groundwater maps indicate groundwater flow direction is south to southwest. <br />Groundwater flow directions may significantly fluctuate due to groundwater pumping, rainfall, <br />groundwater recharge, etc. Therefore, based on these factors, changes in groundwater depth, <br />gradient and flow direction may vary at this site. Please see site specific data based on <br />installation of groundwater monitoring wells in Section 4.4. <br />36274 / ST03R1919 Page 3 of 19 <br />,L) 2004 Kleinfelder, Inc. January 5, 2004 <br />