Agenda - Public Works Committee - 05/15/2012

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approximately 1.5 feet. This would, however, increase the HWL in the pond near the clubhouse, which would appear to adversely affect the fairway for Hole # 1 8. The estimated cost to replace the two culverts under the carts paths is $6,642. Table 16 includes the individual costs this alternative. Saturated soil along Hole #15 Another issue is occurring along Hole # 15 near the Rum River. The soil in the area is saturated. There is an existing rock dam, Area 3 on Exhibit 19, southeast of the most saturated area of the fairway. Part of the fairway was excavated to help to determine the problem and drain the area. Based on our review, it appears that the water being contained by the rock dam may be infiltrating into the soil and causing the saturation. There is a dropped of approximately seven feet from the rock dam to the bottom of the downstream channel. We also noticed that the existing drain tile that was excavated along Hole # 15 was plugged with roots and soil. We recommend two alternatives to address the soil saturation along Hole # 15. First, the drain tile should be replaced to improve the drainage in the area. Second, the area of the creek that is being contained by the rock dam should be lined with an impermeable material to eliminate the water infiltrating through the soil. Lining the creek will eliminate the infiltration into the soil and the new drain tile will help to keep the existing soil ry. The estimated cost to replace the drain tile and line the creek bed is $13,530. Table 17 includes individual costs for this alternative. Flooding of Hole #3 and #17 Flooding of Hole #3 and #17 is also an issue at the golf course. The stormwater drains south through three 15" culverts, labeled Area 4A, Area 4B and Area 4C on Exhibit 9, and then to the Rum River. One alternative to lower the HWL's in the area would be to install bigger culverts. A 21" culvert was modeled to replace the culverts at Area 4A and 4B and a 24" culvert was modeled to replace the culvert at 4C. The following table summarizes the 100-year HWL's for the three areas: Existing 100-Year HWL Area 4A Area 4B Area 4C 859.3 859.3 858.5 Proposed 100-Year HWL Area 4A Area 4B Area 4C 859.1 858.7 858.3 The estimated cost to replace the three culverts is $4,990. Table 18 includes individual costs for this alternative.