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30 May 2000 AGE-NC Project No. 97-0372 Page 3 of 17 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 tum 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 surface water feature in the vicinity of the property is the Mormon Slough, approximately 800 feet north of the site. Based upon the General Soil Map from the San Joaquin County Soil Survey,published by the United States Department of Agriculture Soil Conservation Service in 1992, the subject property is situated within the Jacktone-Hollenbeck-Stockton (JHS) association. The JHS soil types are located within basins and basin rims. The soils in this association generally consist of moderately well drained to poorly drained fine textured soils that are moderately deep to a cemented hardpan. The soils are generally derived from both marine and non-marine environments, and generally formed in alluvium derived from mixed rock sources. Advanced GeoEnviron nenlal,Inc