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Project Description Report of Composting Site Information Tracy Material Recovery Facility and Transfer Station 30703 S. MacArthur Drive, Tracy, Califomla 95377 Seismici And Faulting A regional seismicity and faulting study was conducted to develop estimates of 1) Holocene surface fault rupture potential at the site, and 2) mean peak ground accelerations the site. There are no known Holocene faults within the site boundaries and no evidence of active faulting was observed during field activities at the site. Therefore, the risk of surface rupture at the site is considered low. The nearest known Holocene faults are those associated with the Vemalis and Midway faults, located approximately 8.5 kilometers (km) and 9 km from the site, respectively(Wagner, et al., 1990). The project site is located within Uniform Building Code (UBC) seismic risk zone 4. RGH (1993) evaluated potential strong ground motion at the site due to earthquakes generated by nearby active and Late Quatemary faults. The results of this evaluation indicate that significant ground accelerations for the site could be generated by earthquakes occurring on the Vernalis and Midway faults, located less than 10 km from the site or from larger earthquakes occurring on major active faults farther away from the site. Mean peak horizontal bedrock accelerations at the site are estimated at 0.5g, which would translate to ground accelerations of approximately 0.3g (RGH, 1993). Hydrology A discussion of regional and local groundwater and surface water sources, properties, and flow is presented in this section. Surface Water H drolo The Tracy MRF/Transfer and Composting Facility site is approximately 1,000 feet south of the Corral Hollow Creek in a quany pit. The creek originates in the foothills of the Coast Range Mountains and flows east info the San Joaquin River which flows north into the Delta. The Corral Hollow Creek watershed extends from its headwaters in the Coast Range to approximately the Delta Mendota Canal. Box culverts allow water flows to cross above the California aqueduct and the Delta Mendota Canal. The channel of Corral Hallow Creek terminates approximately 1.5 miles east of the Tracy MRF/Transfer and Composting Facility site, and any flood waters would "sheet flow"across the farmlands at that location. Corral Hollow Creek flows only during winter in response to rainfall and runoff. The creek is dry during the summer months. A minor tributary of the Corral Hollow Creek runs parallel to the Tracy MRF/Transfer and Composting Facility site. Outside of the quarry, the natural drainage in the site vicinity consists of sheet flow to street drainage ditches and natural drainage channels. Within the quarry pit, the collected water percolates into the granular soils exposed on the quarry bottom. The Tracy MRF/Transfer and Composting Facility site is not within a 100-year Flood Zone per the Federal Management Agency(FEMA) Flood Maps. Edgar&Associates,Inc. 9 Tracy Compost Fac Proj Desc04231 0