09-25-2013 Council Agenda - Laserfiche WebLink

Home Browse Search

2.5 Existing Utilities The following is a summary of the utility history for the project area. 2.51 Sanitary Sewer The project lies within 3 sanitary sewer districts (4, 5, and 8) as displayed in Exhibit 9. District 5 flows to District 4 via pump station number 10. District 4 ultimately discharges into the Metropolitan Council interceptor line I -SP -221 near the intersection of Larpenteur Avenue and Interstate 35 -E. District 8 flows east from the project area and ultimately discharges into the Metropolitan Council's Beltline Interceptor I -SP -7122 near the intersection of Roselawn Avenue and Trunk Highway 61. The majority of the sanitary sewer in the project area was installed in the early 1960's as part of the City of Maplewood's Project No. 1, Improvement No. 5. These sewer mains consist of mostly 8 -inch vitrified clay pipe (VCP). A force main lies within portions of McMenemy Street and Laurie Road, connecting Sanitary District 5 to District 4 via lift station number 10 at the intersection of McMenemy Street and Lark Avenue. This force main consists of 4 -inch cast -iron pipe (CIP). A portion of this system was replaced in the early 1990's with Ductile Iron Pipe (DIP) as part of City Project 90 -07. An abandoned 20" CIP force main lies along the west side of McMenemy Street within the City of Little Canada. A parallel gravity sewer services the properties along the west side of McMenemy Street. The City of Maplewood's public works department has noted a number of cracked pipes along with a significant amount of root intrusion into the sanitary sewer mainline throughout the project area. Root intrusion typically occurs at joints in the pipe. Root intrusion into the mainline causes a significant amount of backups, resulting in considerable time spent clearing mainlines. It also contributes to the deterioration of the pipes increasing the chance for backups, while also allowing for groundwater and stormwater to enter the sanitary sewer system. 2.52 Water Mains The water main system for the Arkwright- Sunrise neighborhood is owned and maintained by Saint Paul Regional Water Services (SPRWS). The water main in the project area was installed in the mid to late 1960's and consists of mostly 6 -inch CIP. SPRWS has identified approximately 9,700 lineal feet of water main requiring replacement in the project area. They are recommending the replacement due to brittle cast -iron materials that were previously used for water main pipe installation due to their potential for frequent breaks. No water service is currently available to those properties along Burr Street from Hendry Place to Highway Drive. These properties currently obtain water from private wells. In reviewing past project documents, along with discussing the lack of water service with area residents, it was determined that water main was proposed to be installed in this area in the past, but was turned down by area residents. 2.53 Storm Sewer For the purposes of precise drainage modeling, the neighborhood has been divided into eight distinct drainage areas as shown in Exhibit 10. Each area flows to a distinct drainage feature and impacts the drainage systems of other agencies in the area. The following is a brief description of the existing drainage areas: • Existing Drainage Area 1 — 0.30 Acres I0 20