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subject property is located at an average ground elevation of approximately 27 feet above mean sea level (msl). There are no surface waters on the subject property. The closest surface water to the property is the Morman Slough, which is approximately 2 miles from the subject property). A review of a quarterly ground water monitoring report developed by Kleinfelder for a neighboring facility on May 2, 2007 reveals that the site is located on the Great Valley Geomorphic province of California. The valley is comprised of thick marine and non- marine formations from the late Jurassic to late Holocene. The upper most strata of the great valley is primarily comprised of alluvial, flood, and delta plains of the two major rivers (Sacramento and San Joaquin Rivers) and their tributaries. The eastern and southeastern flanks of the valley are characterized by metamorphic and granitic rocks outcrop. A review of a well installation report by CH2MHILL, dated March 2002 reveal that the site in a neighboring property is underlain by unconsolidated alluvial deposits. The soil encountered in the subsurface include clay, silt, sand and gravel. The predominant soil formations are, however, are interbedded sandy clay and silty sand. Groundwater at this site, under normal conditions, as documented by CH2MHill's historical ground water monitoring is approximately -53 feet below ground surface (bgs) with a Northeasterly gradient in 1991. The groundwater level, however, has, risen 33 feet to its present elevation due to the cessation of pumping from three production wells and other municipal well pumping in the area. According to the San Joaquin County Flood and Water Conservation District (Spring 2003) and historical ground water monitoring by CH2MHILL and Kelinfelder (Kleinfelder, 4`h quarterly ground water monitoring report of 2007 for the Former Disco Facility) in the vicinity reveals that groundwater flows at a gentle gradient toward the southeast. Page 6 of 27