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ElkRi Elk River cmvelMi�nnmrim <br /> ver <br /> Utility Analysis <br /> Sanitary Sewer System <br /> The final reclamation area grading plan shows that the study area will slope from a higher elevation on <br /> the south end to significantly lower elevations in the northerly areas which make gravity service from <br /> the entire gravel mining area to the existing WWTF infeasible. The very southerly portion of the study <br /> area (south of Old CSAH 33) is located on the highest ground and may have the elevation necessary to <br /> facilitate gravity flow to the City's sanitary sewer infrastructure, but the existing pipes with the urban <br /> service may not have the capacity to collect and convey sewage to the plant. The existing system should <br /> be fully evaluated to determine if sufficient capacity exists for conveyance of sewage from this portion <br /> of the study area. <br /> The existing (2014) operational capacity of the WWTF would not allow for treatment of sewage <br /> generated in the entire study area. According to the Wastewater Treatment Facility Plan completed in <br /> 2013, upgrades planned for the WWTF will provide the capacity to treat wastewater generated south of <br /> Old CSAH 33. At this time, additional upgrades to the WWTF to treat the remaining areas in the study <br /> area have not been planned. <br /> Growth will likely occur from south to north. A logical approach to providing flexible sanitary sewer <br /> service to much of the developable area would be a gravity system that conveys flow to the low areas <br /> and a major lift station at that point to pump wastewater flow into the collections system. To facilitate <br /> the use of lift stations capacity improvements in the existing trunk system will be necessary or an <br /> interceptor sewer to the WWTF will be required to provide the necessary collection and conveyance <br /> capacity. Another approach may be temporary lift stations until such time that the investment in a <br /> trunk sewer to the north, a major lift station in the north, and a forcemain back to the south is <br /> warranted. Potential locations of lift stations are indicated in Figure 22. <br /> 42 <br />