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CREATIVE CONCEPTS KOK KOA conducted a field review of the project site to identify issues and opportunities. Field observations were conducted on a Monday morning and also a Friday evening during rush hour. UTILITY CONFLICTS There are a number of utility manhole covers at proposed traffic circle locations. There are other utility obstructions such as SCE vaults and vents. Many of the manhole and utility covers are in the center of the circle that otherwise would be the ideal location for a tree to be planted. To work around these obstacles, we recommend implementing low-lying shrubbery or hardscape treatments. Designing temporary irrigation for only the plant establishment period is a good alternative if permanent irrigation connections are problematic. Connection to the irrigation controller may require additional SCE coordination and fee for design. DRAINAGE Drainage and catch basins will be critical at project locations like the bulb -outs at the intersection of Bush Street and 10th Street. Considering the skewed angle of the intersection, the bulb -outs could extend a distance into Bush Street. In an effort to avoid relocating catch basins to provide adequate drainage, KOA will evaluate the option of implementing biofiltration swales or detention basins in the bulb -out corners. The swales would either lead to existing catch basins or around corners and provide a water quality management benefit. We may obtain geotechnical studies to gauge infiltration rates of the native soil to support the swales. Hydrology and hydraulic studies may be performed to evaluate the proper drainage channels. We will evaluate the design of curb cuts or box drains in the bulb -outs. A detention basin example is at our recently constructed roundabout at the intersection of Myrtle Avenue and Harding Street, in the City of Long Beach, shown below. MANEUVERABILITY In designing traffic circles, we assume a long wheelbase truck, trailer, or bus that needs to turn left must turn in front of the center circle rather than go around it. None of the intersections are large enough to accommodate an AerialCat 101 fire truck going around the circle. Using the design experience KOA gained from the Vista Street, Daisy Avenue, and Delta Avenue bike boulevard projects in Long Beach, we will develop a solution that accommodates larger vehicles that must occasionally travel through the project intersection. If curb extensions impede the path of larger vehicles, painted bulb -outs with flexible delineators may be proposed instead. KOA OF SANTA ANA