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HomeMy WebLinkAboutApril 1999 Feasibility Report tea• ��w� �, (0 lt'�pg' Feasibility Report Baldur Park Sanitary Sewer Improvements Orono, Minnesota April, 1999 File No. 139-99-102 April 21, 1999 Honorable Mayor and City Council City of Orono PO Box 66 Crystal Bay, MN 55323-0066 Re: Feasibility Report Baldur Park Sanitary Sewer Extension Our File No. 139-99-102 Dear Mayor and Council: Enclosed, for your review is our preliminary report on the Sanitary Sewer Extension for Baldur Park area in Orono. This development is located west of Tonkawa Road and north of C.R. 51 on the south shore of North Arm. This report describes the sanitary sewer improvements necessary to provide municipal sanitary sewer service to this area. Cost estimates for the proposed improvements are presented in the Appendices. We would be pleased to discuss this report further with the City Council or City staff at any mutually convenient time. Respectfully submitted, BONESTROO, ROSENE, ANDERLIK AND ASSOCIATES, INC. Tom P. Kellogg TPK:kf I hereby certify that this plan, specification or report was prepared by me or under my direct supervision and that I am a duly Registered Professional Engineer under the laws of the State of Minnesota. .pe Glenn R. Cook, P.E. Date: April 21, 1999 Reg. No. 9451 Table of Contents Page No. Letter of Transmittal 1. Table of Contents 2. I. Introduction 3. Figure 1 - Location Plan 4. H. Summary and Recommendations 5. III. Sanitary Sewer 6. Figure 2—Baldur Park Gravity Sewer Option 8. Figure 3 —Baldur Park Pressure Sewer Option 9. IV. Cost Analysis 10. Table 1- Cost Summary 10. V. Project Schedule 11. Appendix A—Baldur Park Gravity Sewer Cost Estimate Appendix B —Baldur Park Pressure Sewer Cost Estimate Baldur Park Sanitary Sewer Improvements 2 I. Introduction The City Council has requested this report to determine the feasibility of extending the existing sanitary sewer on Baldur Park Road to the north end of Baldur Park peninsula, as shown on Figure 1. The existing sanitary sewer was constructed in 1965 to Manhole#64 shown just west of lot 20. There is one existing home and several undeveloped lots north of the existing sanitary sewer. The existing home and all lots north of Manhole #64 are within the existing MUSA boundary. The existing residence is served by a non-conforming on site septic system. City records indicate that the existing system is non-conforming due to lack of a 3-foot separation from the seasonal water table. The City has not confirmed whether there is a suitable alternate septic site to serve the existing home. The topography of Baldur Park peninsula and its' proximity to lakeshore make City sewer preferable to long term septic usage. There are currently thirteen individual lots north of the existing sanitary sewer on the north end of Baldur Park peninsula owned by two different people. The lots are not all buildable due to setbacks and City zoning ordinances. In 1982 the City granted preliminary plat approval for a total of three lots on the property north of the existing sewer. The preliminary plat was never carried out but, for the purposes of this report, we will assume the proposed sewer would serve three parcels. This report describes the sanitary improvements required to completely serve the northerly end of Baldur Park peninsula. The proposed sanitary sewer improvements are presented on Figure 2. An alternate design is presented on Figure 3. The costs of the proposed improvements are presented in the appendices and a cost summary is presented in the Cost Analysis section. Baldur Park Sanitary Sewer Improvements 3 _ \ / I 1 \c lff r ` I■ NORTH �.�� 1 • ARM ‘..1*,....- =\41t-f- - \,___ IL ii, �� MAXWELL 'L- _��� : !Pk e/\11\ ���\ilr BAY __ tslll _ i .Val\ _� pi � ��y1 110 ��:7■�� - ---- - \ • -- - -- 14111111 1i0�i� PROJECT LOCATION I �o lir \ il, el •, /i- it-ra ;// */ ., ..>4\ --11111*A.. ‘11% ,,\I 1 i , . , A,%\i!I a iill 1 III I ♦ - �� aim`� — - ,. ,,e ; .*- MI.. iffir•iran ///// mu- Cr Mr I ie_�� ./ ,.....• Vet-_ -r taw ///////////%!-t-c-MIBIPIN �� :�'����: am u.////%jam i _ !1�1�,�1IIIIIi�i i. , �o .�,. MEI limEtOmililik/ '�'I�I� Illlllllllllliilll Ills�-'•�` I �Nur _ = ,_. A � �;_ (= i CRYSTAL , NW - 1 im.iowy� RD ���t� BAY C `G�� �� •lit,',-(14 �RA4 -\fes �g�,y :M1 ,-. itei V11111116b. )1A "esa _____ IIIIP SAO \Vitali '\ tot\..... . oma- sop 0 50D 1000 Scale in feet BALDUR PARK ki Bonestroo 0 Rosene ORONO, MINNESOTA FIGURE 1 vi Anderlik & Associates LOCATION PLAN Engineers & Architects 139102REP.DWG 4-6-99 COMM. 139-99-102 II. Summary and Recommendations The construction of sanitary sewer to serve the northerly end of Baldur Park peninsula is feasible from an engineering standpoint. The project is necessary because of topography, a non-conforming septic system and proximity to the lakeshore. The capital cost as well as operation and maintenance costs have been considered in determining that the project is cost effective. The cost of these improvements are interrelated and should be assigned equitably between all properties. The following recommendations are presented for consideration by the Orono City Council: 1. That this Report be adopted as the guide for installation of sanitary sewer in the northerly end of Baldur Park peninsula. 2. That the City conduct a legal and fiscal review of the proposed project prior to the public hearing. 3e That a public hearing be held on the proposed improvements. The total estimated project cost of$75,000 should be incorporated in the public notice. There are 3 units proposed to be assessed for the trunk and lateral improvements. Baldur Park Sanitary Sewer Improvements 5 III. Sanitary Sewer The proposed sanitary sewer for the Baldur Park area is shown on Figure 2. A review of the project site indicates the routes shown on the figures are recommended from a construction standpoint. The Baldur Park area would be served by a gravity sewer connected to the existing sewer located at the north end of Baldur Park Road. The mainline sewer would be along the gravel driveway that serves the existing home as shown on Figure 2. The sanitary sewer main would be PVC pipe, 8 inches in diameter. The proposed alignment along the existing driveway will provide less than 5-feet of cover over the pipe. Insulation would be installed above the pipe to provide protection against freezing. Sewer services would be PVC pipe, 4 inches in diameter. Service stubs would be installed to the property line or to a point 30 feet from the main. Property owners would be responsible for the installation of the service line between the service stub and the home. The proposed manholes would be constructed in the driveway. The sanitary sewer construction will require complete driveway reconstruction. The driveway will be reconstructed with 12 inches of aggregate base and geotextile stabilization fabric. An alternate design for the sanitary sewer is shown on Figure 3. This design would provide for all properties to be served by a pressure system. Each property would own and maintain a residential grinder station. Service stubs would be provided to the property line or a distance of 30 feet from the main. The property owner would be responsible for the installation of the grinder station and the service line from the home to the service stub. A cost estimate for the alternate design is included in the appendix. The project will be constructed primarily on private property. The alignments selected and shown on Figures 2 and 3 will require permanent and temporary easements to allow for construction. Detailed cost estimates for the sanitary sewer improvements are presented in the Appendices. Baldur Park Sanitary Sewer Improvements 6 ZO L-66-62 L 'MOD 66-9—tf 0Ma'd3bZ016l speJ!ypJV ' siaeUl5u3 W I ISAS kLIAVe=19 — eJ I M]S )\eIVII NVS sexpossy la Z ain0H V1OSINNIW `0N0e:1O Y )IllJOPub' IN euesoLI ooizseuoe rir >leiVd d(1 O1d8 , w a„ Iii 00£ 0 N f /$iIj AV8 1d1S).�J0 ..•/ a3M3S AllndaO ONI1SIX3 ----- II, 310HNbW J.11nb'�10 ONII °SIX� iir eEMIIS ).11AVedO — , 310HNVW )\IIAVe:lO • ',!/- O# . *%.jam 1 Weib' HledON .w-l•- ‘ ‘ .:* -0\4 4 1 ilitii44\ %., \ it . _ i79# HW ONIISIX] 4,r. \ 4 � A?�b' HI?ION z� Vit g.– 4,).VMhnl?da ONIlSIX] No c \\ 1 \ ]Sf0H ONIisux S i I \ Z \ 3 ' EXISTING HOUSE I 'C 's-- \ o 1 �� EXISTING DRIVEIWAY AI" , 101 �� NORTH ARM 4 ir+4 4,,,/ \ EXISTING \AH #64 Iliii 110.._..,_,..__ 1 0 I i, lari SS % , 4 to •. ORTH ARM l ,,,,, ,,,,,.. ____ ir AL N ..---- # , 4 • e, •.'� ACORCEMCESS MAIN ANH OLE— F o EXISTING GRAVITY v1A\1HOLE - iri / - ----- GRAVITY SEWED �, f7'/( ' CRYSITAL BAY , I N T I I 0 300 Scale in feet BALDUR PARK fli Bonestroo v Rosene ORONO, MINNESOTA FIGURE 3 A & Associates SANITARY SEWER — PRESSURE SYSTEM Engineers & Architects 139102REP.DWG 4-6-99 COMM. 139-99-102 IV. Cost Analysis Detailed cost estimates for the proposed improvements are presented in the appendices. These costs include a 5 percent contingency, a 20 percent allowance for design, inspection, legal, and administration costs, and a 5 percent allowance for capitalized interest and bonding costs during construction. The costs are based on 1999 construction and can be related to the ENR index for March, 1999 of 5,986. A summary of the estimated costs for the proposed improvements is presented in Table 1. Table 1. Summary I Item Estimated Cost Baldur Park Sanitary Sewer (Gravity) $75,000 (Gravity Option) Sanitary Sewer (Pressure) $58,000 (Pressure Option) The cost estimates do not include easement costs that could be incurred on the project. It is recommended that the sewer construction costs be assessed uniformly over the area to be served, based on a total of three units. This results in a charge of$25,000 per unit for the gravity option. If the pressure option were chosen the charge per unit would be $19,333. Baldur Park Sanitary Sewer Improvements 9 V. Project Schedule Date Event May, 1999 Publish and mail notice of public hearing June, 1999 Public hearing June, 1999 Order preparation of plans and specifications August, 1999 Plans and specifications complete August, 1999 Advertise for bids September, 1999 Open bids September, 1999 Assessment hearing September, 1999 Award construction contract September, 1999 Begin construction June, 2000 Complete construction Baldur Park Sanitary Sewer Improvements 10 APPENDICES Baldur Park Sanitary Sewer Improvements 11 CITY OF ORONO 1999 SANITARY SEWER IMPROVEMENTS BALDUR PARK FILE NO. 139-99-102 Sanitary Sewer PRELIMINARY COST ESTIMATE EST. UNIT EST. ITEM UNIT QUANTITY PRICE COST Mobilization LS 1 10,000.00 $10,000 8" PVC,SDR 35,0'-8'deep LF 450 26.00 11,700 8" PVC, SDR 35, 8'- 10'deep LF 80 28.00 2,240 8"PVC, SDR 35, 10'- 12'deep LF 30 30.00 900 8"x 4"wye EA 3 75.00 225 4" PVC service pipe LF 90 18.00 1,620 Standard 4'diam. MH EA 3 1,800.00 5,400 MH overdepth LF 3 150.00 450 Improved pipe foundation LF 560 2.00 1,120 Mechanical trench compaction LF 650 1.00 650 Televise sewer LF 560 1.00 560 Connect to existing sewer EA 1 1,000.00 1,000 Common excavation CY 300 7.00 2,100 Geotextile fabric SY 800 1.00 800 Class 5 aggregate base, 100%crushed TN 600 12.00 7,200 Clear and grub TR 5 500.00 2,500 Silt fence LF 500 2.00 1,000 Seeding w/topsoil, mulch and fertilizer AC 0.4 3,000.00 1,200 Bituminous street patching SY 50 20.00 1,000 Insulation SY 450 10.00 4,500 Estimated Construction Cost $56,165 +5%Contingencies 2,808 $58,973 +20%Legal, Engineering and Administration 11,795 $70,768 +5%Capitalized Interest and Bonding 3,538 Total Estimated Cost $74,306 CITY OF ORONO 1999 SANITARY SEWER IMPROVEMENTS BALDUR PARK FILE NO. 139-99-102 Sanitary Sewer-Alternate PRELIMINARY COST ESTIMATE � M tit•,..:'Wt ;:Z•i:,?aK.....W��;‘.. g, �y�.����..,a. .r .�r r \v .,. F ...KGX"- EST. UNIT EST. ITEM UNIT QUANTITY PRICE COST Mobilization LS 1 5,000.00 $5,000 Connect to existing sewer EA 1 1,000.00 1,000 Access or air release manhole EA 1 3,000.00 3,000 Trench or directionally bore 2"HDPE LF 560 24.00 13,440 1 1/2"HDPE service pipe LF 90 15.00 1,350 2"x 1 1/2"tee EA 3 200.00 600 1 1/2"curb stop and box EA 3 175.00 525 Gravel driveway restoration SY 150 15.00 2,250 Bituminous street patching SY 50 20.00 1,000 Silt fence LF 200 2.00 400 Seeding w/topsoil, mulch and fertilizer AC 0.1 3,000.00 300 Residential grinder station EA 3 5,000.00 15,000 Estimated Construction Cost $43,865 +5%Contingencies 2,193 $46,058 +20%Legal, Engineering and Administration 9,212 $55,270 +5%Capitalized Interest and Bonding 2,763 Total Estimated Cost $58,033 /6O.000 6 I = 44.3 A3' .. e-mibt-t,.-- .,\ ,.„.,,,,,,-, ,f5F_:, ( . ,; oteli , 4: 11,__ 4,1\ ! lava, ,, ,..,.; 5? 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