12-01-2021 Council Packet - Laserfiche WebLink

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Prepared by: Bolton & Menk, Inc. WOODLYNN AVENUE 2022 Street & Utility Improvements (Woodlynn Ave, Ryan Dr) ǀ 0N1.125241 Page 8 Public Works staff has noted that there are no known deficiencies with the sanitary sewer system. Bolton & Menk staff reviewed each of the sanitary structures within the project area. The structures are precast and in good to very good condition. Based on the age, material, and positive performance, the useful life of the sanitary system is expected to outlast the pavement improvements described in this report. 4. Storm Sewer The existing storm sewer system for the west portion of Woodlynn Avenue is composed of 12-inch diameter storm sewer that conveys stormwater west from two roadway catch basins to a larger collector system located along Rice Street. This system is in good condition and are expected to outlast the pavement improvements described in this report. The existing storm sewer system east of the railroad is located on the north half of Woodlynn Avenue and is composed of 12-inch and 15-inch diameter reinforced concrete pipe (RCP). The system receives stormwater from one greenspace catch basin at the west, two roadway catch basins located at midblock, the east low-point catch basin, and private storm sewer that collects parking lot runoff and conveys it to the roadway storm sewer. Stormwater is channeled to the east before releasing to the adjacent drainage ditch located within the Waterworks Trail easement. City maintenance staff and property owners have noted that Woodlynn Avenue experiences drainage problems during heavy rain events. The low point catch basins becomes overwhelmed by overland drainage and ponds. Additionally, the downstream manhole just before the low-point catch basin will blow its lid during heavy rain events; this is a result of excessive pressure within the system, indicating inadequate system capacity. · Two of the three existing 10-inch diameter outlet pipes to the Waterworks Trail easement have become plugged over time and no longer provide the adequate discharge rate. This deficiency is causing the stormwater surcharging experienced during rain events. Aside from the drainage problems noted above, the system is in structurally sound condition. Aside from the downstream improvements discussed later in this report, the system is in good condition and is expected to outlast the pavement improvements described in this report. 5. Right-of-Way The Woodlynn Avenue platted right-of-way is 40 feet wide, much less than the traditional 60-foot or 66-foot right-of-way. Additionally, the established roadway is not located entirely within the roadway; the current road crosses the northwest corner of the 90 Woodlynn Avenue parcel. For many years, private parking stalls within the industrial park have spilled into City right-of-way. With the lack of a defined roadway, sporadic vehicular parking, and tight roadway geometry, this street has presented unique challenges for vehicles, city maintenance staff, and truck delivery drivers for many years. This project presents the opportunity to clean the corridor up and define a true roadway.