Appendix A Natural Environment Study (Minimal Impacts)

Home Browse Search

Natural Environment Study (Minimal Impacts) Specifically, there would be a net decrease of 0.0175 ac of permanent fill within delineated waters of the U.S., and a net decrease of 0.04 ac of permanent fill within delineated CDFW aquatic resources. As shown on Figure 3, a potential temporary bike detour route would be constructed within the Santa Ana River channel. This potential detour route would be constructed and deconstructed during dry -season work within the channel. The detour route would have a dirt base with an asphalt surface, and would be entirely removed following construction of the Project. Impacts associated with the potential bike detour route shown on Figure 3 would amount to 0.11 ac of temporary fill within delineated waters of the U.S. and 0.13 ac of temporary fill within delineated CDFW aquatic resources. In addition, temporary fills associated with dewatering activities and/or materials staging within the BSA will likely be required to complete the bridge removal and replacement. Such temporary fills would not permanently reduce channel capacity or result in the loss of aquatic resources. Indirect effects such as dust and construction -related runoff are also possible, but such impacts would be effectively avoided or minimized by implementing standard Best Management Practices (BMPs) during construction. Since work would be occurring within jurisdictional aquatic resources, resource agency permits (USACE Section 404 Nationwide Permit authorization, CDFW Section 1602 Streambed Alteration Agreement, and RWQCB Section 401 Water Quality Certification) will likely be required for the Project. In addition, the Santa Ana River is a USACE facility under Section 14 ("Section 408") of the Rivers and Harbors Act of 1899, so Section 408 permission will also be required for the Project. 4.1.1.3. AVOIDANCE AND MINIMIZATION EFFORTS/COMPENSATORY MITIGATION No compensatory mitigation is required because the Project would not adversely impact any jurisdictional wetlands, riparian areas, or waters of the U.S. A net increase of channel capacity/waters of the U.S. would occur with implementation of the Project. The Project would require compliance with all measures contained in any applicable USACE, RWQCB, and/or CDFW permit. In order to avoid impacts to aquatic resources within the Santa Ana River and adjacent habitat areas, standard BMPs will be implemented to prevent loose soil or pollutants associated with the Project from inadvertently entering the channel, as detailed in ................................................................................................................................................ . Fairview Street Improvements from 9th Street to 16th Street and Bridge Replacement Project 37