Agenda - Public Works Committee - 02/21/2012

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Sodium Street Description The house at 16756 Sodium Street has been experiencing water in the basement. Exhibit 17 shows the existing area. One reason for water in the basement could be that stormwater fills the ditch on the east side of Sodium Street, overtops the road and if the driveway culvert is blocked, the water fills up the ditch on the west side of Sodium Street and drains toward the house. The water then seeps along the basement wall and eventually into the basement. Another reason for water in the basement may be due to a high groundwater elevation in the area. Alternatives The following alternatives address the issue of water entering the basement from the road ditch. Alternative 1 Alternative 1 will include installing a culvert under Sodium Street, regrading the west ditch of Sodium Street, constructing a berm to keep the water in the ditch, and replacing the existing driveway culvert. The ditch would be graded to drain to the south property line of 16756 Sodium Street and a culvert would be installed to drain the stormwater to the swale on the west side of the lot. Exhibit 18 shows the proposed construction. The culvert along the south property line is needed since a ditch cannot be graded without impacting the existing septic drainfield. To be able to install the pipe along the south property line to the swale on the west side of the lot, a utility pole and a utility pedestal will have to be relocated from the southeast corner of 16756 Sodium Street. Moving the utilities will allow the area to be graded as needed to construct the ditch and the culvert. Regrading the ditch will prevent the stormwater from draining toward the house and reducing the chances of having water in the basement. The estimated cost for this alternative is $12,225. Table 27 includes the individual costs for this alternative. Alternative 2 Alternative 2 is similar to Alternative 1, but instead of installing a culvert along the south property line to the swale, a retaining wall would be constructed. This alternative would only be required if the utilities in the southeast corner of the lot were unable to be relocated. The estimated cost for this alternative is $18,847. Table 28 includes the individual costs for this alternative.