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generation estimates were based on the waste generation projections for the Tracy Planning Area and the material handling requirements of the station. The maximum number of vehicle trips Monday through Friday for the year 1995 is estimated to be 504 and is anticipated to increase to 1,126 by the year 2010. Estimated vehicle trips are included in Appendix D. Tables in Appendix D show vehicle estimates by vehicle and waste type with estimated distributions by hours. Additionally Saturday and Sunday expected traffic volumes are included. Traffic impacts in the vicinity of the facility were analyzed in the EIR prepared by the San Joaquin County Community Development Department with the traffic analysis by Korve Engineering. Five intersections in the region were selected based on their proximity to the project site and the probability that traffic would utilize the intersection. The level of existing use for each intersection was determined and direct and indirect effects of increased traffic volumes were evaluated. Results of the analysis indicated that impacts to existing roadway structural conditions and intersection operations was less than significant. Background information together with the estimates of vehicle traffic resulting from station operations are also located in Appendix D. C. Drainage System Capacities Surface water hydrologic analysis for the Tracy Materials Recovery & Transfer Facility was conducted to develop the layout for the storm drainage facilities and sizing them for the highest flow resulting from a 24-hour frequency precipitation event. The surface water hydrology study was conducted using both the Rational Method and computer modeling using Haestad Methods programs FLOWMASTER 1; Quick TR-55, Hydrology for small Watersheds; and POND-2, Detention Pond Design and Analysis. Hydrology calculations are presented in this report in Appendix E. The retention basin is designed to retain all runoff generated from the site except runoff from the wood and yard waste composting area. The basin is sized to accommodate twice the volume of runoff generated from a 10-year/24-hour precipitation event in accordance with San Joaquin County Improvement Standards, September 1991. It is also designed to empty by percolation and evaporation 100 percent of the required volume of storage within 10 days. All closed conduits and drainage ditches will be designed to prevent overtopping during a 10- year/24-hour frequency precipitation event. Diversion ditches around the composting area will LIPROJECT/397NRF/RST-1-TCY Revision 1.0 24 December 15, 1993