RES 06035 - Laserfiche WebLink

sions would increase traffic along junipero Street, North of junipero Street along Sunol Boulevard, traffic which normally would have used Bernal Avenue to access the station could instead proceed south along Sunol Boulevard to junipero Street, The net results of the relocation of the station would be to affect some nearby inter- sections, However, the intersections beyond 1/4 mile from the station entrance would not be expected to experience any significant changes in traffic conditions, Note that an environmental evaluation of an ACE Train Station on the Bernal site would be required whether or not such a station were included in the Specific Plan EI R area, C 18 Comment: The DEIR notes (pp, 87-89) that the project would result in more surface area covered by impervious surfaces (buildings, paved roadways, sidewalks) thus generat- ing more peak period storm water discharges and potential downstream flooding, The DEI R refers (pp, 58 and 158) to general compliance with regional storm water requirements and flow calculations from 2000, Response: The EIR (pp, 88-89) discusses the process by which changes in land use have the potential to increase peak storm water discharges and hydro modification impacts on downstream creeks, The EIR notes that flow duration control (to avoid hydromodifi- cation) requires that the increase in surface runoff created by the installation ofimper- vious surfaces be retained onsite with gradual discharge either to groundwater through infiltration, reduction by evapotranspiration, and/or discharge to the downstream watercourse at a level less than the critical flow for bed and bank mobility of the stream, The provision and design of the two detention basins on the Phase II site (shown in DEIR Figure 13) have taken into consideration the project's effects on storm water runoff, including compliance with hydromodification policies of the regional flood management agency, The detention basins have been sized to accommodate antici- pated development and designed to be operated in a manner that the post-develop- ment storm hydrograph closely resembles the predevelopment storm hydrograph, Further, weir plates have been included at the outfall controls so that discharge rates from the detention basins will mimic the pre-development condition, The Balance Hydrologic Monitoring Plan for the detention basins discusses the observation of water surface elevation during critical storm events to assure appropriate storm water release controls, Proper operation of these facilities, together with compliance with Countywide NPDES Provision C.3, would assure that the project's impacts on storm drainage would be less than significant (DEI R p, 158), C 19 Comment: The DEI R does not discuss how the project will handle the upstream storm water that historically drains to the Bernal Property from the Fairgrounds; from the existing catch basin system along Pleasanton Avenue, and along a short curb section on the north side of Bernal Avenue; and from the road surface and median along Bernal Avenue, Response: The comment requests clarification on a detail of the drainage plan for the site, In conjunction with channel restoration on the Bernal Property, the City has engaged a 22