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Page =2 3. Mitigation 4.5 l states that the drainage basin should be designed to retain the flows expected from a 100 -year 24 hour storm event.'® San Joaquin County Design Standards require (as stated in the Project Description) that the retention pond be sized to G8 contain200percent of the computed volume of runoff from the 10 -year 24 hour storm. In addition, the pond shall be designed to empty by percolation and evaporation 100 percent of the required volume of storage within 10 days. San Joaquin County Design Standards should be used in sizing this retention pond. 4. Mitigation 4.5-6 states that "The project proponent should g construct berms or take other measures adequate to prevent a 100 year 24 hour flood in Corral Hollow Creek from accidentally overflowing into the pit." We have not been able to verify that there is a likelihood of Corral Hollow Creek overtopping and draining into the pit. C9 Unless there is documented evidence that this may occur, we feel that the requirement for berms around the site is unfounded. Perhaps a more appropriate mitigation would be that the project applicant provide and analysis of 'Corral i hollow Greek for the 100 year 24 hour storm event to determine the likelihood of overtopping and diverting into the pit. 9 5. Table C-1, Project Traffic Distribution indicates that 100 1 percent of the recycled material trucks will be directed South on Chrisman Road. G10 This should be revised to indicate that 50 percent of the recycled material trucks will be directed to the South on, Chrisman Road and the remaining 50 percent will be directed to the North on Chrisman Road. Please contact me ifY ou have any questions regarding these comments. Very truly yours TRACY DELTA SOLID WASTE MANAGEMENT, INC. Daniel A. Ma lionico P.E. Engineering Coordinator A