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r r Cl C r� LI F C l I� L .......... 4.5 WATER RESOURCES ENVIRONMENTAL SETTING The characteristics of the surface water, ground water, and existing water uses, and the hazards and constraints that are considered significant with respect to the development of the proposed project are discussed in this section. Data that have been considered in the determination of significant environmental impacts and corresponding mitigation measures are included. Surface Water Courses The proposed project site lies approximately 1000 feet south of the Corral Hollow Creek. This creek originates in the foothills of the Coast Range Mountains and flows east into 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 Hollow Creek terminates approximately 1.5 miles east of the project site, and any flood waters would then "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 proposed project site. Outside of the quarry pit, 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 pit bottom. The proposed project site is not identified as being within a 100 -year Flood Zone as shown on the Federal Emergency Management Agency (FEMA) Flood Maps. The California State Water Resources Control Board (CSWRCB) has the authority for permitting of storm water discharges to waters of the State. Specific categories of industrial activity and industrial facilities which discharge storm water associated with industrial activity are required to comply with the California General Industrial Storm Water Permit by filing a Notice of Intent (NOI). The Tracy Materials Recovery and Transfer Facility must file such a notice for its operations. Since construction of the facility will disturb more than five acres of land compliance with the California General Construction Storm Water Permit is also required by filing an NO[ for construction of the facility. These regulations are intended to control pollutants, such as heavy metals and suspended solids, that degrade surface waters of the State when they are transported by storm water from commercial and industrial areas. The purpose of the permit is to • Eliminate non -storm water discharges to storm water systems, • Develop and implement a Storm Water Pollution Prevention Plan, and • Perform monitoring of discharges to storm water systems. Under the conditions of the State General Permit, a Storm Water Pollution Prevention Plan (SWPPP) and Monitoring Program for the project shall be prepared. The SWPPP serves to help identify the sources of 1 ER -93-1 -64- (9-27-93)