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-0000, 2.0 SITE DESCRIPTION The Traina Property(Site) is an active apricot alluvial fans contain about 100 feet of Pleistocene orchard (Train-Barnes Farms) located at 29900 to Holocene age unconsolidated clay, silt, sand, MacArthur Drive approximately 3.5 miles south and gravel of derived from several seasonal east- of Tracy, California. The Site occupies 156.9 flowing streams draining the Diablo Range to the acres (APN 253-210-15) consisting of most of the west(Hotchkiss and Balding, 1971). These are SW 1/4 of Section 10 in Township 3 South, Range underlain by approximately 800 feet of Pliocene 5 East. As shown on Plate 2, the property is to Pleistocene age unconsolidated and semi- bordered by MacArthur Drive to the west, an consolidated alluvium of the Tulare Formation unnamed section road to the south and unpaved (Hotchkiss and Balding, 1971). The Tulare roads to the north and east. Orchards and consists of upper and lower members of mainly �., cultivated fields are to the north, south, east, and coarse-grained lenticular alluvium and a laterally west. An existing Teichert Aggregates quarry continuous confining bed termed the Corcoran occurs across MacArthur Drive to the west, and Clay Member. The Tulare Formation occupies the western portion of the boundary of conformably overlies the San Pablo Group of the Site. Miocene age. 2.1 Topography 2.3 Seismicity r The area around the Site occupies north-easterly The only fault in Site vicinity with documented facing slopes of a alluvial fan derived from Corral Historic displacement is the Greenville Fault r Hollow Creek to the west of the site. The located approximately 15.6 miles west-northwest property is essentially flat and slopes gently to of the site (California Division of Mines and the east-northeast at a gradient of 0.006 feet per Geology, 1994). A northern segment of the foot. The highest elevation, at the southwest Greenville Fault ruptured in 1980 with a 5.6 corner of the property, is approximately 158 feet magnitude earthquake producing a maximum of 3 above mean sea level, while the lowest elevation, centimeters of right-lateral displacement along a at the northeast corner of the property, is series of en echelon faults with up to 6.5 r approximately 134 feet above sea level (USGS, kilometer long surface traces(Hart, 1981). 1981). Approximately 6 miles southwest of the Site, along Corral Hollow, the Carnegie Fault displays �+ 2.2 Geology evidence of Holocene age displacement (less than 11,000 years) (California Division of Mines and Geology, 1994). The Holocene age Carnegie Fault The Site is located in the west-central portion of the Great Valley of California geomorphic is an eastern segment the Quaternary age (post �+ 1,600,000 years) Corral Hollow Fault. Another province (Jenkins, 1943). This portion of the Quaternary age fault, the Black Butte Fault, Great Valley occurs in the north-western part of occurs approximately 4 miles southwest of the San Joaquin Valley, a topographic and structural Site (California Division of Mines and Geology, trough bounded on the east by the northwesterly 1994). The Black Butte Fault is one of a series of trending foothills of the Sierra Nevada and by the Quaternary and Late Quaternary age faults similarly trending Coastal Range on the west. including the Antioch and Midway Faults(to the .,. The San Joaquin valley extends from the north) and the San Joaquin Fault to the south confluence of the Sacramento and San Joaquin which bound (trend along) eastern flank of the Rivers 260 miles to the southeast to the Tremblor Coastal Range (Diablo Range) west of the Site. Range (Hotchkiss and Balding, 1971). The geology found in the area surrounding the 2.4 Hydrogeology Site consists of a series of coalescing alluvial fans and plains. Low topographic relief reaches about The groundwater beneath the Site vicinity flows 10 feet locally created by headward erosion of the toward the coastal range to the southwest ' fan surfaces by active stream channels. These (Hotchkiss and Balding, 1971). Confined aquifers G:\WP\GDH\GH36371Z.151 Harding Lawson Associates 3 ar