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R Project Description — Report of Composting Site Information ? Tracy Material Recovery Facility and Transfer Station 30703 S. MacArthur Drive, Tracy, California 95377 Compost Leachate Management System The Composting Facility has been designed with a conservative system to collect all storm water run-off from the compost pad and compost leachate generated from the composting operation. The Compost Leachate Management System exceeds all regulatory 1� requirements, and consists of a compost pad liner(Section 4.1.2), a compost leachate collection and removal system (Section 4.3.2), and an evaporation pond equipped With a clay liner with a permeability of 1x10"& cm/sec (Section 4.2.2, Section 4.1.3). .i Compost Leachate Generation A conservative approach was used to perform the compost leachate generation study by assuming 100 percent of the rainfall on the compost pad was captured by the collection system and transported to the evaporation pond. To estimate the required capacity of the evaporation pond, a compost leachate generation analysis was done for a 900-yea'rl24- hour storm event. F Compost Leachate Collection And Removal System Storm water and compost leachate runoff from the compost pad will drain to an on-site clay-lined evaporation pond. As required by the Draft Composting Facilities Permitting Procedures and Enforcement (Title 14, CCR, Chapter 3.1), the compost pad storm)water and compost leachate collection system will be designed to control a 25 year/24 hour rainstorm event. The compost leachate collection system will consist of a concrete,lined drainage ditch transporting compost leachate and storm water from the compost pad into to the evaporation pond. In accordance with the requirements of the Draft Composting Facilities Permitting Procedures and Enforcement(Title 14, CCR, Chapter 3.1), the compost leachate management system has been designed to recycle the collected compost leachate back to the compost processing area or to evaporate the compost leachate. Storm Water Drainage Control ! The surface water hydrologic analysis for the Tracy Materials and Recovery Facility was conducted to develop the layout for the storm drainage facilities and sizing them for the highest flow resulting from a 10-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 shall Watersheds; and POND-2, Detention Pond Design and Analysis. Figure 7, Preliminary Grading and Drainage Plan depicts the on-site storm water drainage control system. i Storm water runoff from all areas except the compost pad will drain to an on-site retention pond. Runoff will be collected via surface swales and ditches and an underground storm drainage system. The site storm drainage system will be designed for the 10-year/24-hour rainstorm event (San Joaquin County Storm Drainage Design Standards), except for the drainage system collecting potential run-off from the composting pad which, as requred by the CIWMB Draft Composting Facilities Permitting Procedures and Enforcement(Title 14, CCR, Chapter 3.1), will be designed for a 25 year/24-hour storm event. The retention pond will be sized to contain 200 percent of the computed volume of runoff from the 10 year/24-hour rainstorm event. The pond has been designed to empty by percolation and 14 Edgar&Associates,Inc. Tracy Compost Fac ProiDesc121907 :f i