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Page 3 of 4 <br />capacity to retain the run-off from the enlarge compost pad of 150,000 square feet. <br />Engineer's Review: <br />The drainage system is adequate to manage the run-off generated by the increase size of the <br />compost pad of 150,000 square feet. The run-off from the wood waste processing pad drains <br />to the retention basin that was designed to handle 223,025 square feet of service area <br />including the area where the wood waste processing pad is located today. The current <br />language on page 24 and page 25 is descriptive with the calculations in Appendix E. The only <br />changes to the RFI on page 25 would to replace the last line of the first whole paragraph with <br />the following below: <br />"'The evaporation pond is sized to retain up to 57,500 cubic feet of run-off without <br />freeboard, and is adequate to retain the 100 -year, 24-hour storm event over 150,000 <br />square feet compost pad for a design storm of 22,517 cubic feet, leaving approximately <br />35,000 cubic feet of freeboard capacity." <br />Appendix E can be supplemented by the current EBA memo, the Edgar &Associates <br />hydrological calculations, and the as -built plans. The additions to Appendix E are attached to <br />this RFI Amendment, <br />r4.111 <br />n$ <br />Evan W.R. Edgar <br />Edgar & Associates, Inc <br />1822 2lst Street <br />Sacramento, Ca 95814 <br />(916)739-1200 <br />(916)739-1216 Fax <br />From: Garrett <br />T. Backus [EH] [mailto:gbackus@sjcehd.com] <br />Sent: Friday, September 22, 2006 1:58 PM <br />To: Evan Edgar <br />Subject: Tracy Transfer RFI amendment <br />Evan, <br />I have been reviewing the amendment and need some clarification regarding the compost pad evaporation pond <br />calculations. The worst case scenario will have the pond filling with water from two components: the water <br />balance from December and January plus the water from a 2.8 inch 24 hour storm. The total pond capacity is <br />57,500 cu ft. <br />EBA Engineering calculated 20,000 cu feet for the water balance and 17,000 cu feet for the 24 hour storm adding <br />to a total 37,000 cu feet, much below the pond capacity of 57,500 cu ft. These calculations are for the 90,000 sf <br />pad. <br />Your calculations figure 22,517 cu feet for the 24 hour storm but do not include a number for the Dec and Jan <br />water balance. Do you need to calculate the water balance fora 150,000 sf pad and add that value to the 24 hr <br />storm volume? <br />9/25/2006 <br />