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A-1. Key Financial Strategy: Alternative Sanitary Sewer Feasibility Study for the TH 101 and Pioneer Trail AreaA-1 MEMORANDUM CITY OF TO: Paul Oehme, PE, Director of Public Works/City Engineer CUMNSEN FROM: Alyson Fauske, PE, Assistant City Engineer 7700 Market Boulevard DATE: June 13, 2016 PO Box 147 Chanhassen, MN 55317 SUBJ: Key Financial Strategy: Alternative Sanitary Sewer service for the TH Administration 101 and Pioneer Trail Area, Project No. PW285BB. Phone: 952.227.1100 BACKGROUND Fax: 952.227.1110 Building Inspections On November 23, 2015, the City Council approved the Environmental Assessment Phone: 952.227.1180 Worksheet (EAW) and adopted the Official Map for the TH 101 Improvements from Fax: 952.227.1190 Pioneer Trail (CSAH 14) to Flying Cloud Drive (CSAH 61). Engineering On February 8, 2016 the City Council approved the consultant contract with Kimley Phone: 952.227.1160 Horn for the preparation of Sanitary Sewer. Fax: 952.227.1170 Development to advance prior to the trunk lift station being constructed and the Finance This item was one of City Council's Key Financial strategy items for 2016. Phone: 952.227.1140 Fax: 952.227.1110 The Wilson's Nursery Development proposal (Foxwood) has alternative sewer Fax: 952.227.1110 services being proposed. The alternative sewer service, however, would not help pay Park Recreation for the trunk lift station needed to service this area. To allow the Foxwood Phone::952.227.1120 Fax: 952.227.1110 Development to advance prior to the trunk lift station being constructed and the 7901 Park Place property to the south of Foxwood being developed, a temporary lift station is being Recreation Center proposed. Also, fees should be levied against this development to help pay for the 2310 Coulter Boulevard future lift station. A portion of the future lift station on Powers Boulevard is Phone: 952.227.1400 proposed to be assessed to benefiting properties in the area. Fax: 952.227.1404 services to this area. Some properties many not want to develop at this time so Planning & DISCUSSION Natural Resources Phone: 952.227.1130 During the TH 101 EAW public process, some property owners along the TH 101 Fax: 952.227.1110 corridor expressed interest in the extension of sewer and water to their property so they can develop. Currently, the State of Minnesota may have turnback funds Public Works available for TH 101 improvements in 2023. Unless a new funding source is secured 7901 Park Place such as a federal grant or new state funds, TH 101 will likely not be improved for at Phone: 952.2271300 Fax: 952.2271310 least 7 years. It is most cost effective to install sewer and water improvements at the time TH 101 is improved. However, with many property owners expressing interest Senior center to develop prior to 2023, the city has elected to evaluate alternatives to extend public Phone: 952.227.1125 services to this area. Some properties many not want to develop at this time so Fax: 952.227.1110 alternate sewer and water alignments other than what is in the comprehensive plan have been evaluated. Website www.ci.chanhassen.mn.us The comprehensive plan shows trunk sewer and water extending from the Powers Boulevard and Pioneer Trail intersection through Bluff Creek Golf Course to the study area. Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow Paul Oehme Approve Agreements and Engineering Contract June 13, 2016 Page 2 Figure 8.8.2 - 2030 Sewer Districts and Sub Districts Legend M Existing Lift Stations - Existing Force Main Future Lift Stations »- Sanitary Sewer . . Future Sewer MCES Sewer 0 1,500 3,000 Future Force Main Districts Sub Districts C City Boundary H 4,500 6,000 ; F w•- �BBI 5 Several alternatives were evaluated by the consultant and vity staff. Five alternatives are being presented and are shown in yellow on the following graphics. In the following graphics the areas shown in the blue could be serviced by gravity sanitary sewer; the other areas would require the installation of a lift station and force main. Notes regarding the estimated costs below are as follows: 1. Estimates only include trunk utility costs. Additional lateral sanitary sewer and water main will need to be constructed with development. 2. Assumes that the Mustard Seed property will dedicate the easements required for utility construction at no cost to the city. 3. Easement costs do not include costs for condemnation (if necessary). 4. Easement costs do not assume any additional compensation to Bluff Creek Golf Course for loss of business operation. Assumes that the Bluff Creek Golf Course will dedicate the easements required for utility construction at no cost to the city. 5. Muck excavation is estimated based on limited soil boring information. For all the options a majority of the costs would be proposed to be assessed back to the benefiting property owners. Assessment roles have not been completed at this time. Paul Oehme Approve Agreements and Engineering Contract June 13, 2016 Page 3 Option 2A: Estimated cost is $3,620,000 This alternative includes a 15 -inch diameter trunk gravity sanitary sewer from TH 101 (approximately 370 feet south of Bramble Drive) through the Bluff Creek Golf Course, connecting to the gravity system at Powers Boulevard and Pioneer Trail. A 12 -inch trunk water main is also proposed within the same utility corridor as the trunk sanitary sewer. This alternative is consistent with the comprehensive plan. Some of the 15 -inch trunk sanitary sewer within this alignment would be 40 to 50 feet deep, which costs 60% more and could present future maintenance concerns. This alignment assumes that the project would proceed before Bluff Creek Golf Course is redeveloped which results in approximately $1 million in easement acquisition costs. Once the golf course develops the grades over the utility corridor will likely be altered. Cut areas over the deep portion of the sanitary sewer would be beneficial; however, there would then be inadequate cover over the water main. Fill areas could also be a cause for concern if the depth of cover over the utilities becomes excessive. The alternative would require the golf course to be closed during construction for approximately one year. If the golf course decides to develop in the future the sewer alignment may have to change depending on how the development is laid out. The city recently met with the golf course owners and it does not appear there are any plans to develop the golf course in the near future. Paul Oehme Approve Agreements and Engineering Contract June 13, 2016 Page 4 Option 2B: Estimated cost is $3,780,000 A modification of Option 2A, this option routes the utility corridor to the property boundaries of Bluff Creek Golf Course to the extent practicable in order to minimize future cut and fill over the utility corridor and reduce impacts to the business. Similar to Option 2A, this alternative assumes that the project would proceed before Bluff Creek Golf Course is redeveloped which results in easement acquisition costs in excess of $1 million. These costs are higher than Option 2A as the utility corridor is longer in Option 2B. �' ! 3 I i -�L I 4 . � IIS,• i-- --- ---- --� ----------- i MAIL. �` f ---T--:' Some of of the 15 -inch trunk sanitary sewer within this alignment would be 40 to 60 feet deep. Ontion 3A: Estimated cost is $5,520,000 This alternative significantly reduces the impacts to the Bluff Creek Golf Course. This alternative includes a 15 -inch diameter trunk gravity sanitary sewer from TH 101 (approximately 370 feet south of Bramble Drive), utilizing the existing rights of way for TH 101 and Pioneer Trail for the trunk utility corridor. A 12 -inch trunk water main is also proposed within the same utility corridor as the trunk sanitary sewer. Additional easements would be required with an estimated cost of over $500,000. A tree preservation easement may be impacted by this alignment at the corner of Pioneer Trail and TH 101. The sanitary sewer depth within this corridor would be less than 30 feet. "- ~------ - --------ti i i MAIL. �` f ---T--:' Some of of the 15 -inch trunk sanitary sewer within this alignment would be 40 to 60 feet deep. Ontion 3A: Estimated cost is $5,520,000 This alternative significantly reduces the impacts to the Bluff Creek Golf Course. This alternative includes a 15 -inch diameter trunk gravity sanitary sewer from TH 101 (approximately 370 feet south of Bramble Drive), utilizing the existing rights of way for TH 101 and Pioneer Trail for the trunk utility corridor. A 12 -inch trunk water main is also proposed within the same utility corridor as the trunk sanitary sewer. Additional easements would be required with an estimated cost of over $500,000. A tree preservation easement may be impacted by this alignment at the corner of Pioneer Trail and TH 101. The sanitary sewer depth within this corridor would be less than 30 feet. Paul Oehme Approve Agreements and Engineering Contract June 13, 2016 Page 5 Soil borings along Pioneer Trail from Powers Boulevard to just west of Homestead Lane were taken. The soils in this area are poor so the pipe and manholes would need to be supported. This work is estimated to be in excess of $1 million to just support the sewer pipe and manholes. The benefit assessment calculation will be more complicated to determine for this option than others because the additional infrastructure that would be needed for example to service the Bluff Creek Golf Course if it develops. ` L -------------- ------------- Option 3B: Estimated cost is $4,040,000 This alignment is similar to Option 3A although it avoids the area of anticipated poor soils. By shifting the alignment farther into the golf course the sanitary sewer would be 40 to 70 feet deep. Easement acquisition costs for this alternative exceed $1 million. Some impacts to the golf course operation would be expected. Similar to Option 3A, the benefit assessment calculation will be more complicated to determine for this option than others because the additional infrastructure that would be needed for example to service the Bluff Creek Golf Course if it develops. - 1 J _ 1 - 1 1 This alignment is similar to Option 3A although it avoids the area of anticipated poor soils. By shifting the alignment farther into the golf course the sanitary sewer would be 40 to 70 feet deep. Easement acquisition costs for this alternative exceed $1 million. Some impacts to the golf course operation would be expected. Similar to Option 3A, the benefit assessment calculation will be more complicated to determine for this option than others because the additional infrastructure that would be needed for example to service the Bluff Creek Golf Course if it develops. Paul Oehme Approve Agreements and Engineering Contract June 13, 2016 Page 6 -- x Option 5: Estimated cost is $2,500,000, l This alignment includes a temporary lift station at the northwest corner of the Mustard Seed property, installation of a force main along TH 101 to West 96th Street, upgrades to Lift Station 20 (at West 96th Street), and installation of a force main from Kiowa Trail (at TH 10 1) through Bandimere Park and to the existing gravity sanitary sewer at Lyman Boulevard and Crossroads Boulevard. This alternative only would allow service to be provided to the study area. It would not allow for future development to occur at the bottom of the bluff along Flying Cloud Drive since sewer capacity would not be adequate. For the area along Flying Cloud Drive to develop the sewer would to be extended through Bluff Creek Golf Course first. If this option is preferred to be advanced, an area assessment would be recommended to help pay for the trunk improvement necessary to be extended through the Bluff Creek Golf Course per the comprehensive plan. j '7 i r�7 Paul Oehme Approve Agreements and Engineering Contract June 13, 2016 Page 7 RECOMMENDATION Based on the analysis of this study Option 2A it is most cost-effective approach to service the study area. This option is also consistent with the comprehensive plan. Funding for the other options would be very complicated and assessments could be challenged in court by some property owners that are not ready to develop. ATTACHMENTS 1. Option 2, 11" x 17" 2. Option 3, 11" x 17" 3. 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LAYOUT OPTION 2 rj I I vy I � I NP6µ8�POE / LOW ELKNI CENSITY - T 0.038 YGD 3J.203 ACRES L I POTENOAL PESNIENnAL OEYFEOPIENT 0.027 MID 142.881 ACRES POIENBAL RESWQInAL OEYELOPYENi LDENSITY 0.1 \ 6.,50 YCP { NFCRCFYN�11-3 LIFL L9-3 sTAnav I Em I 4 YGD� FL fl�l-rl� �[`lo r /� I rJ I I I GRAITY E—EEI By E I`j iI I tJl. f00M'FYI1N pNECe0XT0 (^,' L�'4 // o -------------- _ — — _- _- — — — — —. 15 I ,I __--__-__ _I __ _ / Y15 EISf a 1H 101 ) ExISTHc R xn OE\ELaP T �,— — —. - L �. --r T pl F y( I I I- I \\ _ /I - 15.523 ACRES PER N. 61 �`� EgS,eK, RES p& DE9ELOPYENT I CORPoDOR SIODY - I 0.57 W R I I \ �- _ _ Lo. 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E ii u. _"-----' -'-' - ' - -- k;fr e E 8 I•x 6 E P. 8EL 4F 5 x no all a tt at In! •- - --�__ Y.v S.fr 070 \__—___ e5o OPTION 3A PROFILE ew Oh00 I+00 2+00 3h00 1+00 5+00 6+00 7+00 8+00 9+00 10400 11+00 12+00 13100 11+00 13h00 18+00 ,7+00 16+00 18+00 20+00 21+00 22+00 2J+00 21+00 25h00 26+00 27+00 2610D 29+00 30+00 31+00 32+00 3]+00 31+00 35+00 ]8+00 37+00 ]6100 39+00 10+00 41+00 12+00 4.H00 /Ih00 45+00 N100 17+00 46+00 49100 50+00 61+00 52+00 31+00 Si100 55+00 58+00 57+00 58+00 59+00 60+00 81O aa t s A •. s 55 t ^44 •Y !F "4 r6 9' 6 !t •a 4E 4 t s AI .s xI .• x? 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