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08 September 2000 AGE -NC Project No. 97-0372 Page 3 of 18 2.1. SITE LOCATION AND DESCRIPTION The former RV Circuits site is located on the southeast comer of the intersection of Worth Street and South Center Street in an area of mixed light industrial, commercial and residential land use. The site is at an elevation between 10 feet and 15 feet above mean sea level (MSL), closer to the 15 feet above MSL. The regional surface topography slopes gently toward the west-southwest to southwest. The irregularly shaped, approximately 32,740 -square -foot site is occupied by a 60 -foot by 120 -foot building, asphalt -paved parking lot and driveway, and a covered concrete -floored area south of the building. Locally, small patches of soil are exposed in disturbed portions of the asphalt. Much of the northern half of the building was utilized for office space and silk screening and photography related uses; the southern half was utilized for plant maintenance, chemical and parts storage, laboratory use and processes for the manufacture of circuit boards. The covered, concrete paved area south of the building was utilized for chemical storage and for a treatment facility to treat waste -water generated during the manufacturing process. A sewer line runs under the east side of the building to Worth Street. An industrial sewer line runs from the south end of the building along and outside the east side of the building to Worth Street. Storm drains are located near the southwest and northwest corners of the property. A cement -filled former floor drain is located in the material preparation room as shown on Figure 2. An inactive municipal well, pump station No. 37-01, owned by California Water Service is located on the adjacent property south of the subject site, approximately 33 feet from the property line. The well is not in use at the current time due to excessive methane production. The well is screened from 136 feet to 472 feet bsg. 2.2. REGIONAL GEOLOGIC SETTING The site is located in the eastern portion of the Great Valley geomorphic province of California. The valley is a nearly flat, elongate trough trending northwest and southeast for approximately 450 miles. The valley is enclosed by the granitic Sierra Nevada on the east and the sedimentary and metamorphic Coast Ranges on the west. The surficial and upper several hundred feet of subsurface layers consist primarily of unconsolidated alluvial and flood -plain deposits (predominantly sand, silt, and clay) of Quaternary age, which were derived from the mountains of the Sierra Nevada. Beneath the upper sedimentary deposits lie a thick sequence of marine deposits of Mesozoic age, which in turn are underlain by a pre -Jurassic complex of igneous and metamorphic basement rock. The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the principal source of domestic ground water in the 13,500 -square -mile San Joaquin Valley Ground Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River. The nearest Advanced GwEnvironmental, Inc