RES 85316 - Laserfiche WebLink

· . Hydrology o Assemble available data from Pleasanton, EIRs for the NPID and relevant local projects, and other sources regarding runoff and storm drainage. o Describe existing drainage patterns in the vicinity of the project. o Describe hydrology impacts in terms of alteration in storm drainage patterns, increases in runoff quantity, and decreases in surface water quality which may arise from increased vehicular activity, and the project improvements. o Discuss implications of flooding for the project. Determine if the interchanges are located in the 100-year flood zone. Impact as described in Executive Order 11988 and Part 6-7-3 of the Federal Aid Highway Program Manual, Floodplain Management, will be documented. (This task as- sumes floodplain impacts are insignificant and mitigable within the context of the EA.) o Develop mitigation measures for storm drainage, water quality, and runoff control. o Provide a separate technical Appendix which com- pletes the necessary FHWA forms for this task. (This task assumes that a "Low Risk" evaluation will be adequate.) Geology/Soils o Assemble existing data from the City, USGS, Alameda County, and EIRs for the NPID and relevant local projects relative to soil types and engineering properties. (Field collection of geotechnical data is not proposed.) o Discuss existing setting in terms of soil proper- ties, erosion potential, and potential construc- tion problems. o Discuss project response to seismic activity in the local area. o Describe impacts in terms of short-term construc- tion (erosion) impacts, general soil suitability as roadbed support, geotechnical risk and other factors.