RES 06035 - Laserfiche WebLink

Response: The commenter suggests that implementation of the Specific Plan could increase runoff from the site, potentially causing erosion in downstream waterways, This phenomenon is referred to as "hydrograph modification" or "hydromodification," Under section c(l) of the Hydrology and Water Quality section of the DEI R (p, 88) the methodology for addressing potential hydromodification impacts is discussed, Under existing regulatory requirements, the project must comply with the County- wide NPDES permit and the City's storm water program that addresses hydromodi- fication, The City is committed to the development of a drainage plan, including a redesigned conveyance channel and new detention features, that approximate (and in some ways improve) the existing discharge hydrograph for the site, See also Responses A6a and C18, E 7 Comment: Downstream storm drain facilities, including creek areas, should be evaluated for adequate conveyance capacity, Off-site and/or on-site mitigation measures may be necessary to accommodate the augmented runoff, Response: The commenter suggests that implementation of the Specific Plan could increase runoff from the site, potentially causing flooding of downstream conveyances, Com- pliance with the requirements of the County-wide NPDES permit with regard to hydrograph modification will minimize the potential for increased peak discharges from the site and exceedance of capacity of downstream conveyances, Please refer to Response H1 for additional discussion of hydro modification requirements, E 8 Comment: The Alameda County Flood Control and Water Conservation District is an active participant in the efforts to reintroduce steel head trout back into the network of creeks in Alameda County, including Alameda County and the Arroyo de la Laguna, The success of the proposed fish passage through the affected portion of the Arroyo de la Laguna is of significant interest to the District and County, Response: Comment acknowledged, E 9 Comment: Consideration should be given for a project contribution toward the restoration of the rails in the County's Niles Canyon Transportation Corridor and acquisition of rolling stock for an operator; i.e, wheels to operate transit between Pleasanton and Fremont, and improve and use Dublin-Pleasanton corridor as a busway to Dublin/Pleasanton BART to reduce traffic congestion, Response: Comment acknowledged, 29