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12/17/2007 L. Cumulative (2020) With Proiect Impact on the Blomquist Street/Maple Street Intersection Potential Impact 7-17: The Blomquist Street/Maple Street intersection is expected to operate at LOS D during the AM peak hour, and LOS F during the PM peak hour, under Cumulative (2020) Without Project Conditions. The addition of project traffic is expected to result in LOS E in the AM peak hour plus an increase in the average delay at the intersection by more than 5.0 seconds in the PM peak hour. The intersection is also expected to meet the Caltrans "Peak-Hour Volume Warrant" for traffic signal installation during the AM and PM peak hours under Cumulative (2020) With Project conditions. These effects would represent a significant cumulative impact. Mitigation 7-17: Install a traffic signal at the intersection, widen the northbound approach to include a dedicated left turn lane and a shared through/right-turn lane, and reconfigure the southbound approach to include a dedicated left turn lane and a shared through/right-turn lane. With signalization and the recommended lane modifications, the intersection is expected to operate at LOS C during the AM and PM peak hours under Cumulative (2020) With Project conditions. Alternatively, install a roundabout at the intersection. With installation of a roundabout, the intersection is expected to operate at LOS A and LOS B during the AM and PM peak hours, respectively. Findings: Implementation of either one of the above mitigation alternatives is feasible and would reduce this cumulative impact at the Blomquist Street/ Maple Street intersection to a less-than-significant level. V. BIOLOGICAL RESOURCES A. Steel head and Chinook Salmon Potential Impact 8-1: The proposed project would fill approximately 9.50 acres of estuarine habitat for the steelhead, a federally listed threatened species, chinook salmon- California Coastal ESU, also a federally listed threatened species, and chinook salmon-Central Valley fall/late fall run, a federally listed species of concern and state-listed species of special concern. Construction activities could also result in increased water turbidity, contaminant release, noise, and underwater shock waves within this habitat. These possible effects represent a potentially significant impact. Mitigation 8-1: The Project Applicant shall: (1) coordinate with NOAA Fisheries and CDFG on steelhead and chinook salmon issues; and (2) formulate and implement a Habitat Mitigation and Monitoring Plan (HMMP) for these species to the satisfaction of NOAA Fisheries and CDFG. The HMMP should include, but not be limited to, the following provisions: 1. The construction contractor shall use a silt curtain around the area where dredging activities are likely to release sediment into Redwood Creek or Smith Slough and where construction activities are directly adjacent to estuarine habitat. Atty/Reso/Reso.1772 121707 18 14829 Muff# 613