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City of Orono <br />Kelly Avenue Area <br />Storm Drainage Improvements <br />January 1995 <br />Uiii Sewer Alignment <br />We have ideniified five options for constructing a new outfall line from Kelly pond shown on <br />Figure 2 and 3. The first four options are gravity lines and the fifth option is a lift station <br />forcemain system. <br />Option A - Provides for construction of storm sewer following Kelly Avenue from the Kelly pond <br />to the Carman Cove Pond. This option results in a 20 foot deep excavation on Kelly Avenue to <br />provide gravity flow. The advantage of this option is that the work can be completed on the street <br />right-of-way. <br />Option B - Provides for construction of storm sewer that follows the natural drainage way. This <br />route is across private property and will require some tree removal. The depth of excavation is <br />minimized by following the perimeter of the wetland area. <br />Option C - Provides for replacement of the existing culverts and drainage tile in the area. This <br />drainage route again follows the namral drainage route. This option would require excavation in <br />the wetland area to create more open water and assure positive drainage. <br />Option D - Provides for construction of storm water pipe between the ponds. This option utilizes <br />the ponds for water quality improvement as does option "C". This option utilizes the best features <br />of options A, B, and C. <br />Option E - Provides for construction of a lift station and force main system. The existing storm <br />sewer system would be left in place and maintained to control normal rainfall events. The lift <br />station would operate when the larger storm events occur. The force main would follow Kelly <br />Avenue from the lift station near Kelly pond to Carman Cove. <br />Street Reconstruction <br />The elevation of Kelly Avenue should be raised to minimize street flooding. The proposed outfall <br />options would not eliminate the possibility of water inundating Kelly Avenue but would shorten <br />the time period. The raising of Kelly Avenue will affect the sanitary sewer line and it should be <br />replaced. <br />The raising of Kelly Avenue in the low area (figure 4) between Navarre Cove and Carman Road <br />will result in fiimre senlement of 5 inches as indicated by the soil report (Appendix C). The <br />settlement can be minimized with the use of wood chips but the cost is greater. <br />Bcnestroo, Rosette, AnderUk A Associates, Inc. <br />13976-ipc