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HomeMy WebLinkAboutDTS-10-159 - Freeport Sewage Pumping Station and Forcemain - Class Environmental Study Report REPORT Report To:Development and Technical Services Committee Date of Meeting: November 08, 2010 Submitted By: K. Grant Murphy, P.Eng., Director of Engineering Services Prepared By: Binu J. Korah, P.Eng., Manager of Development Engineering 519-741-2974 Muhammad Memon, P.Eng., Design & Construction Engineer 519-741-2419 Ward(s) Involved: Ward 2 & 3 Date of Report: October 27, 2010 Report No.: DTS 10-159 Subject:FREEPORT SEWAGE PUMPING STATION AND FORCEMAIN - CLASS ENVIRONMENTAL STUDY REPORT RECOMMENDATION: THAT the Freeport Sewage Pumping Station and Forcemain Environmental Study Report (ESR) prepared by Aecom Canada Ltd., dated August 2010 be received; and further; That the Freeport Sewage Pumping Station and Forcemain Environmental Study Report (ESR) be filed with the Ministry of the Environment (MOE) for the mandatory thirty (30) day review period as required by the Environmental Assessment Act. BACKGROUND INFORMATION The City of Kitchener is responsible for operating and maintaining the sanitary sewer networks and pumping stations within its boundaries. In May 2008, the City retained Earth Tech Canada Inc., now AECOM, to complete a Capacity and Infrastructure Analysis of the Freeport Sanitary Sewer Pumping Station and related catchment areas. The Capacity and Infrastructure Analysis was completed in September 2009 and revealed that the existing pumping station is currently operating beyond its rated capacity during peak flows. In addition the station does not have firm capacity and is therefore not in compliance with MOE standards. It is concluded that the existing station cannot accommodate further development. Accordingly, the pumping station and related infrastructure should be upgraded to provide the required capacity to allow growth and development within the Freeport catchment area. Further, the City’s 2009 Development Charge Background studies had identified the need to upgrade the Freeport Sewage pumping station and forcemain(s) to provide wastewater servicing for the Freeport Catchment Planning area. The required improvements to the pumping station and forcemain should be completed in a timely and efficient manner. ïï ó ï Subsequent to the Capacity and Infrastructure Analysis, a Municipal Class Environmental Assessment (EA) was undertaken in order to identify responsible alternative options and ultimately a preferred solution for the required upgrades. The Class EA was undertaken as a Schedule “B” Environmental Assessment in accordance with Municipal Engineers Association document, October 2000, as amended in 2007. The Class EA process for the Freeport Pumping Station included consultation with the public, agencies and stakeholders through the issuance of a Notice of Commencement, the development and regular updating of a contact list and a Public Information Centre (PIC) to present the findings and receive comments from the public. REPORT: Prior to the approval of any zone change applications, site plans or future developments within the Freeport catchment area, the Freeport pumping station requires both building and process upgrades. In addition to the pumping station upgrades, the existing forcemain and gravity sewer needs upgrades to convey the sanitary sewage from the pumping station to the Kitchener wastewater treatment plant. To identify options for upgrades for the pumping station and forcemain, the City of Kitchener initiated a Schedule B Class EA to consider the following: Consider various short term and long term options for the servicing of the subject lands Various forcemain alignments including upgrading the existing forcemain(s) and gravity mains. Upgrade the existing pumping station During the Class EA process the following options were evaluated for pumping station and forcemain, with technical, natural environmental, social, heritage and economic aspects being considered: Pumping Station Options: Option 1 - Do Nothing The Do Nothing alternative is a standard consideration for all Class EA projects where the existing conditions are left as is, and no further analysis or work is done. Option 2 The existing equalization tank would be divided into sections. The existing structure would act as forms to construct a new wet well and dry well inside the existing equalization tank. Once complete the portion of the existing equalization tank not being used would be removed and the temporary bypass extended to the emergency storage tank. The existing roof structure over the wet well and dry well would need to be removed and replaced in order to accommodate new equipment, and comply with building standards. A new inlet structure/ bypass chamber would be built on the outside of the proposed wet well. The other half of the equalization tank would be converted into and emergency storage facility, Refer map, Appendix A, Option 2. Option 3 A new wet well and inlet structure would be constructed on the outside of the existing structure. The existing equalization tank would be converted to a dry well and an emergency storage facility. The emergency storage would be separated into tanks, one large tank with two chambers and a single chamber with a sump (if required). Once ïï ó î complete, the wastewater can be directed to the new station and the existing station decommissioned and removed. Once the existing station is removed, a new inlet sewer would be installed and the temporary bypass removed, Refer map, Appendix A, Option 3. Option 4 Option 4 is similar to Option 2. However, this Option includes removing half the existing equalization tank and building a new pumping station instead of using the existing structure as forms. The remainder of the existing equalization tank would be converted to an emergency storage tank. Along with the new wet well and dry well a new inlet structure would be built. Once the new station is complete the wastewater would be diverted and the existing station decommissioned and removed. Once the existing station is removed, a new inlet sewer would be constructed and the temporary bypass removed, Refer map, Appendix A, Option 4. Option 5 Utilize the existing equalization tank as a temporary pumping station. Once the temporary station is in operation, the existing station would be decommissioned and removed. A new station would be constructed at the same location of the existing station. Once the new station is complete the temporary station would be removed and the equalization tank converted to an emergency storage tank, Refer map, Appendix A, Option 5. Forcemain Options: Option 1 - Do Nothing The Do Nothing alternative is a standard consideration for all Class EA projects where the existing conditions are left as is, and no further analysis or work is done. Option 2 Extend the existing forcemain from the existing terminus to the Ottawa/Montgomery trunk sewer. Extending the forcemain will significantly increase the amount of energy required and increase pump size and operating cost. In addition, the existing forcemain will need to be replaced to accommodate the future development flows within the allowable velocity range. A benefit of extending this forcemain and bypassing the existing sewer on Kingsway Drive would be a reduced flow in the gravity sewer. Refer map, Appendix B, Option 2. Option 3 Replace the existing gravity sewer on Kingsway Drive from the forcemain outlet to the Ottawa/Montgomery trunk sewer. The existing forcemain along King Street has to be upgraded to accommodate future development growth, Refer map, Appendix B, Option 3. Option 4 Replace the gravity sanitary sewer under Highway 8 and along Kingsway Drive to Wilson Avenue and outletting to Fairway Road. This option requires upgrades to the existing sanitary sewer along Kingsway Drive and Fairway Road, Refer map, Appendix B, Option 4. Option 5 Install a new forcemain from the new pumping station to an outlet at the intersection of Wabanaki Drive and Goodrich Drive. . Once the new forcemain to Wabanki Drive is in operation, the existing forcemain along King Street would be decommissioned. This option will include a forcemain large enough to accommodate future growth and alleviate the requirement to upgrade either, the Kingsway Drive and/or the Kingsbury Drive gravity sewer and Highway crossing, Refer Map, Appendix B, Option 5. ïï ó í After reviewing and evaluating all public input and comments from other agencies regarding the pumping station and forcemain alternative designs, the project team intends to pursue the approval of Option 4 for the pumping station and Option 5 for the forcemain as the ultimate solution to service the Freeport catchment area, Refer map, Appendix C, preferred Option. FINANCIAL IMPLICATIONS: This project was identified in the City’s 2009 Development Charge Background studies and is required to support the development within the Freeport Catchment area. A Preliminary cost estimate was completed as part of the Class EA evaluation procedure. The preliminary cost estimate for the selected preferred solution is approximately $11,900,000.00 which includes upgrades to the Freeport Pumping Station and re-aligning the forcemain to a new outlet location on Wabanaki Drive. COMMUNICATIONS: As part of the Class EA process, Notices of Study Commencement (October 22, 2008) and Notice of Public Information Centre were published in The Record newspaper. One Public Information Centre (PIC) was conducted. The PIC was held on April 08, 2010 where study findings were presented and comments from the public and agencies were obtained. The following details were presented at the PIC: Class EA process Background Purpose statement Alternative solutions Evaluation criteria of Alternative solutions Preferred alternative Cost estimate Project Schedule Next steps Frequently asked Questions with regards to the EA process and how the public can involved with the process Comment Sheet In addition to the information provided at the Public Information Centre and the published Notices, a number of meetings were held with the stakeholders to discuss various alternatives and their concerns. CONCLUSION: The completion of the Environmental Study Report (ESR) for Freeport Sewage Pumping Station and Forcemain has established a preferred solution that will allow future growth and development within the Freeport catchment area. The preferred solution, as shown in Appendix C, includes removing half the existing equalization tank and building a new pumping station (including new wet well, dry well and new inlet structure). The remainder half equalization tank would be used as an emergency storage tank. The preferred solution also includes the installation of a new forcemain from the proposed pumping station to an outlet at the intersection of Wabanaki Drive and Goodrich Drive. ïï ó ì Staff recommends that the Freeport Sewage Pumping Station and Forcemain ESR be filed with the Ontario Ministry of the Environment for the mandatory thirty (30) day review period as required by the Environmental Assessment Act. ACKNOWLEDGED BY: Jeff Willmer, Interim General Manager DTS ïï ó ë APPENDIX A Pumping Station Option 2 Pumping Station Option 3 ïï ó ê Pumping Station Option 4 Pumping Station Option 5 ïï ó é APPENDIX B Outlet Option 2 Outlet Option 3 ïï ó è Outlet Option 4 Outlet Option 5 ïï ó ç APPENDIX C Preferred Pumping Station Option Preferred Outlet Option ïï ó ïð