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Home My WebLink About2008-08-06 NAC Memorandum NORTHWEST S" CIAO` NS LT T # t 4800 Olson Memorial Highway, Suite 202, Golden valley, MN 55422 :r Telephone: ne ` 63.231 .2555 Facsimile# 763.231 .2561 planners@naeplanning.com CRCLOSE MEMORANDUM TO: Eric Johnson FROM: Scott Richards DATE: August 0, 2008 RE: Oak Park Heights — Revisions to MPCA Permit and Amended Conditional Use Permit for Expansion of the A.S. Ding Ash Disposal Facility FILE NO: 798.02 — 08.00 As you are aware, Xcel Energy submitted a request for a 120 day extension of the development timeline for the amended conditional use permit for expansions to the A.S. King Ash Disposal Facility. The Planning Commission is currently in the process of considering the request and the public hearing for the conditional use permit remains open. The application for the conditional use permit was received on June 0, 2008 and deemed complete when the additional materials, as requested by the city, were submitted by Xcel on June 25, 2008. On June 19, 2008, a letter was sent to Manuel Castilla of Xcel increasing the 00 day review period of the city to 120 days. As a result, the pertinent development timeline dates are as follows: June 0, 2998: Application Submitted June 19, 2998: Letter sent to Xcel Extending Timeline to 120 Days June 25, 2998: Application Deemed complete October 22, 2008: End of 120 Day Development Timeline The City has until October 22, 2098 to make a final decision on the conditional use permit for Xcel Energy. The Fetter received from Xcel requests to extend the timeline an additional 120 days from October 22, 2008. The city Council will consider this request from Xcel at their meeting on August 12, 2008. The city council can determine whether to make a decision on the conditional use permit by October 22, 2008, or accept the additional extension time offered by Xcel. Av..Cel Energy SM 414 Nicollet Mall Minneapolis, Minnesota 55491 -1993 August 1, 2008 Eric A. Johnson City Administrator 14168 oak Park Blvd N. P.O. Box 2007 Oak Park Heights, MN 55082 Re: Xcel Energy's King Ash Disposal Facility Request for Revised conditional Use Permit Dear Mr Johnson: Xcel Energy requests a 120 day extension on the city's decision to issue a revised CUP for the subject facility. Xcel :Energy feels the time is necessary to properly address the sewer line re- -route and solid waste permit issues stemming from the sewer line re- route. The additional time is also needed to evaluate, develop and implement responses to the issues raised at the 7131108 public meeting Xcel Energy hosted. If you have any questions please call my cell phone, (612) 518 -6081. Sincerely Chuck D nkers Project Manager ES record Center King Plant File A Memorandum Bonestroo r - - --_ -- 2335 Highway 3611 To: Dennis Postler Project: Xcel Energy Fly Ash Site Hate: 07.22.2008 St. Paul, MN 55113 From: Kim Hayden Client: City of Oak Park Heights Tel 651 - 636 -4600 Fax 651 -636 -1311 Re Sanitary Sewer Options File No 000055 - 08000-1 www.bonestroo.com We have reviewed several options for the existing trunk sanitary sewer under the Xcel Energy Fly Ash Site. This memo provides details on the various options and their related costs. Option 1 includes the installation of gravity sanitary sewer around the north side of the existing fly ash pit and force main from the south. Construction would include a 15 hp lift station to pump flows from the south half of the City. Existing sanitary sewer and structures in the fly ash pit would be abandoned. This option would provide the City with a new, reliable trunk sewer line, but would also add the maintenance of a lift station. Preliminary layout of this option can be seen in Figure 1 (attached). Option 2 is for tunneling a new sewer line through the fly ash pit parallel to the existing pipe. The advantage would be that a casing pipe would be installed around the carrier pipe, allowing for easier repairs in the future if need be. The disadvantages are that jacking pits would be installed at each end of the tunneling, and possibly interim manhole locations, which would disturb a large area of the existing fill and lining of the fly ash pit. Also, means and methods of tunneling through the sedimented fly ash would need to be explored further. Option 3 includes costs for installation of a cured -in -place pipe lining in the existing trunk sewer lines. CIPP lining is designed to act as stand -alone pipe. Lining the sewer does not necessarily provide additional strength, but if the existing RCP sewer were to fail, the pipe would gain the strength of the underlying CIPP. Pipe lining also slightly decreases the capacity of the i e but CIPP lini would p rovide for a smoother flow than the existing RCP. Because pp � g p g f CIPP lining is typically used for pipe repair and rehabilitation, more research would be necessary to determine the exact effect of lining a pipe that is currently in good condition if this option V was chosen. �D` � A summar y of construction costs for review is as follows: l Sewer Options and Estimated Costs CONSTRUCTION COST + 25% ENGINEERING & PLANNING - Option 1 $333,200.00 $416,500-00 Part 1 — Gravity Sewer $153,100-00 }# Part 2 -- Force Main /Lift Station $180,100.00 ` Option 2 $504,500.00 $743,125,00 Option 3 $255,000.00 $318,750.00 Option 4 $8,445.40 $1 0,556.00 The City also has the option of doing nothing at this point. Some of the existing pipe has had 40 to 70 feet of fill on it for almost twenty years, From soil borings taken by Braun Intertec in 1984, the fly ash pit has limestone bedrock under the fill so long term settlement is not likely to occur. If the City chooses not to proceed with an alternate sewer plan at this time, televising and inspection of the existing sanitary and storm sewer should be completed to document the existing conditions. Costs for this are shown above under Option 4. Additionally, escrow money should be provided to the City by Xcel to cover the cost of the potential future sewer installation. Existing trunk storm sewer also runs under the existing fly ash fill site, and under or adjacent to the proposed additional fill area. Although relocating the storm sewer is not being analyzed or recommended at this time, the City should have an agreement with Xcel Energy whereby they would be responsible for any future pipe failure attributable to the additional fill loading. Attachments: Cost Estimates Figure 1 --- Gravity Sewer, Lift Station and Force Main Page 2 of 2 XCEL FLY ASH SITE - COST ESTIMATE No. Item Units Qty EE Unit Price EE Total Price OPTION 1 PART 1 - GRAVITY SANITARY SEWER: 1 MOBILIZATION LS 1 $12,000.00 $12,000.00 2 CONNECT TO EXISTING MANHOLE EA 2 $1,000.00 $2,000.00 3 CONSTRUCT MANHOLE OVER EXISTING PIPE EA 1 $3,500.00 $3,500.00 4 24" PVC SANITARY SEWER, SDR 26 LF 1,800 $50.00 $90,000.00 5 4' DIAMETER SANITARY MH, 8' DEEP, INCL R-1 642-B EA 3 $1,800.00 $5,400,00 CSTG AND CONC ADJ RINGS 6 4' DIAMETER SANITARY MANHOLE OVERDEPTH LF 100 $100.00 $10,000.00 7 IMPROVED PIPE FOUNDATION, PER 6" INCREMENT LF 1,800 $2.00 $3,600.00 8 ABANDON SANITARY SEWER PIPE LF 2,700 $8.00 $21,600.00 9 SEEDING, INCL SEED, FERTILIZER, MULCH AND DISK AC 2.5 $2,000.00 $5,000.00 ANCHOR TOTAL PART 1 $ 153,100 . 00 PART 2 - FORCE MAIN AND LIFT STATION: 10 LIFT STATION STRUCTURE LS 1 $150,000.00 $150,000.00 11 6" DIP FORCEMAIN LF 1,100 $25.00 $27,500.00 12 CONNECT TO EXISTING MANHOLE EA 1 $1,000.00, $1,000.00 13 SEEDING, INCL SEED, FERTILIZER, MULCH AND DISK AC 0.8 $2,000.00 $1,600.00 ANCHOR TOTAL PART 2 $180,100.00 TOTAL OPTION 1 $333,200.00 OPTION 2 PIPE TUNNELING: 14 MOBILIZATION LS 1 $20,000.00 $20,000.00 15 CONSTRUCT AND REMOVE JACKING PITS EA 2 $30,000.00 $60,000.00 16 24" PVC SANITARY SEWER PIPE, IN CASING LF 1,250 $60.00 $75,000.00 17 40" STEEL CASING PIPE, JACKED LF 1,250 $350.00 $437,500.00 18 SEEDING, INCL SEED, FERTILIZER, MULCH AND DISK AC 1.0 $2,000.00 $2,000.00 ANCHOR N0. Item Units Qty EE Unit rice EE Total rice TOTAL OPTION 2 $594,500.00 OPTION 3 PIPE LINING: 19 CITY SEWER CLEANING LF 2,500 $2.00 $5,000.00 20 SANITARY SEWER, CURED -IN- PLACE LINING LF 2,500 $100.00 $250,000.00 TOTAL OPTION 3 $255,000,00 OPTION 4 ANALYSIS OF EXISTING CONDITIONS: 21 CLOSED CIRCUIT TV INSPECTION - SANITARY SEWER LF 2,830 $1,50 $4,245.00 22 CLOSED CIRCUIT TV INSPECTION - STORM SEWER LF 1,000 $2.00 $2,000.00 23 VISUAL INSPECTION OF STORM SEINER LF 1,100 $2,00 $2+20000 TOTAL OPTION 4 $8,445.00 TOTAL OPTION 1 - GRAVITY AND FORCE MAIN $333,200,00 TOTAL OPTION 2 - TUNNELING $594,500.00 TOTAL OPTION 3 - LINING $ 255 + 000 . 00 TOTAL OPTION 4 - ANALYSIS OF EXISTING CONDITIONS $8,445.00