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kg KLEINFELDER 2 SITE SETTING 2.1 SITE LOCATION The site is located on approximately 101 acres located in Section 3, T3S, R5E (Mount Diablo Baseline & Meridian), in San Joaquin County. The site Assessors Parcel Numbers (APN's) are 248-070-02, -11, -12, -13, and -14; and 248-090-03, and -04. The site is relatively flat with an average ground surface elevation of approximately 125 feet above mean sea level (MSL). 2.2 CURRENT USE AND SITE CHARACTERISTICS According to the RWQCB WDR Order No. 5-00-226, the site has historically been planted with apricots and walnuts. The subdivision is planned to have 83 lots and will be equipped with a package treatment plant for its wastewater. Treated wastewater will be discharged to subsurface computer controlled emitters. Ownership and operation of the wastewater and disposal system has been transferred to the San Joaquin County Department of Public Works. Treatment of the wastewater at the treatment facility will consist of a complete mix, nitrification/dentrification, and modified batch process. Disinfection is accomplished using ozone injection. The package treatment plant will be located near the southeast corner of the subdivision. The leachfield is located along the southern edge of the subdivision (lots 65 to 82). Kleinfelder understands that four monitoring wells, including MW-1, have already been installed at the site. Groundwater is anticipated at approximately 65 feet below ground surface (bgs). All four monitoring wells have incurred some damage during construction activities at the site, however, it appears only MW-1 has been damaged enough to require replacement. 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, 24134.E01 / STO3R304 Page 2 of 10 Copyright 2003, Kleinfelder, Inc. February 26, 2003