The URL can be used to link to this page

Home My WebLink About05(J) - Resolution Approving a Work Order – Markley Lake Ravine Stabilization Project Report701 XENIA AVENUE S | SUITE 300 | MINNEAPOLIS, MN | 55416 | 763.541.4800 | WSBENG.COM Memorandum To: Pete Young, City of Prior Lake From: Jake Newhall, PE Date: February 22, 2021 Re: Markley Lake Ravine Stabilization – Preliminary Design WSB Project No. 017103-000 PURPOSE The purpose of this memo is to outline the preferred preliminary design for addressing erosion in the Markley Lake Ravine, located on the south side of Markley Lake. This memo will include a preliminary design of stabilization improvements, a feasibility level cost estimate, pollutant removal calculations, and an exhibit of the recommended improvements to assist the City in applying for funding. Photos showing the condition of the existing ravine are also included in this memo. STABILIZATION IMPROVEMENTS A combination of hard armoring and soft armoring (natural) stabilization techniques are proposed to address erosion in the ravine located just upstream of the south side of Markley Lake. Stabilization of the approximately 300-foot ravine will result in significantly less erosion potential and reduce the amount of sediment and pollutants that are discharged into the lake. See the attached exhibit for a plan view exhibit of the stabilization techniques and locations for addressing erosion in this ravine. COST ESTIMATE The preliminary engineer’s estimate for the improvements shown in the attached exhibit is 135,270. This includes a 20% contingency and 15% indirect costs. See the attached engineer’s estimate for a detailed breakdown of quantities and costs. POLLUTANT REMOVAL CALCULATIONS WSB has developed a preliminary design to stabilize the Markley Lake Ravin. The annual pollutant reduction resulting from the proposed improvements has been estimated using the BWSR Soil Loss Calculator. It is estimated that stabilization of the 300-foot ravine will result in a reduction of approximately 28 Pete Young February 22, 2021 Page 2 Photo 1: Outfall to Ravine Photo 2: On top of Slope Photo 3: On top of Slope Photo 4: Catch basin on top of slope that collects and conveys water to outfall Pete Young February 22, 2021 Page 3 Photo 5: Outfall to Ravine Photo 6: Debris and erosion downstream from outfall (location of first proposed plunge pool) Photo 7: Downstream of first proposed plunge pool, bank stabilization needed and rock check to slow the water down Photo 8: Location of second proposed plunge pool w/rock check and grading to make slopes more gradual Pete Young February 22, 2021 Page 4 Photo 9: Tapering and stabilization of side slopes and channel needed Photo 10: Tapering and stabilization of side slopes and channel needed (continued) Photo 11: Location of third proposed rock check to slow down water Photo 12: Channel and bank stabilization using both rock and vegetation Pete Young February 22, 2021 Page 5 Photo 13: Sediment removal area Photo 14: Sediment removal area Photo 15: Existing pool prior to trail Photo 16: Outfall to Markley Lake Pete Young February 22, 2021 Page 6 Photo 18: Construction staging and access area Markely Lake Ravine Stabilization Project Design By:JHN City of Prior Lake Checked By:HN 017103-000 Date:2/19/2021 Item No.MN/DOT Specification No.Description Unit Estimated Total Quantity Estimated Unit Price Estimated Total Cost 1 2021.501 MOBILIZATION LS 1 $15,000.00 $15,000.00 2 2101.524 CLEARING & GRUBBING LS 1 $6,000.00 $6,000.00 3 2105.501 COMMON EXCAVATION (LV)CY 100 $40.00 $4,000.00 4 2105.601 SITE GRADING LS 1 $10,000.00 $10,000.00 5 2105.504 GEOTEXTILE FABRIC TYPE 4 SY 400 $6.00 $2,400.00 6 2511.507 RANDOM RIPRAP CLASS III CY 200 $125.00 $25,000.00 7 2573.503 SILT FENCE, TYPE HI LF 200 $6.00 $1,200.00 8 2573.503 FLOTATION SILT CURTAIN LF 50 $35.00 $1,750.00 9 2573.503 SEDIMENT CONTROL LOG TYPE WOOD FIBER LF 400 $3.00 $1,200.00 10 2573.502 TEMPORARY ROCK CONSTRUCTION ENTRANCE EACH 1 $1,500.00 $1,500.00 11 2573.602 ROCK DITCH CHECK EACH 1 $3,000.00 $3,000.00 12 2573.602 ROCK LOG DITCH CHECK EACH 2 $5,000.00 $10,000.00 13 2575.504 EROSION CONTROL BLANKETS CATEGORY 3N SY 2500 $3.50 $8,750.00 14 2575.505 SEEDING ACRE 0.5 $5,000.00 $2,500.00 15 2575.509 SEED MIXTURE 25-131 LB 30 $15.00 $450.00 16 2575.509 SEED MIXTURE 36-211/ WOODLAND MIX LB 20 $40.00 $800.00 17 2575.603 ANCHORED SLOPE PROTECTION LF 160 $35.00 $5,600.00 18 2577.502 LIVE STAKES, DOGWOOD EACH 150 $7.00 $1,050.00 Subtotal $100,200.00 Contingency (20%)$20,040.00 Indirect Costs (15%)$15,030.00 Total $135,270.00 ENGINEER'S ESTIMATE - PRELIMINARY WSB Project: Project Location: WSB Project No: Page 1 of 2 Public Works Consultant Pool Work Order Markley Lake Ravine Stabilization WSB & ASSOCIATES, INCORPORATED, dba WSB This work order (“Work Order”) is issued on this ______ day of ______________, 2023 by the City of Prior Lake (“City”) pursuant to the Public Works Consultant Pool – Master Agreement dated April 20, 2020 (“Contract”) between the City and WSB & Associates, Incorporated, dba WSB (“Consultant”). Based on the mutual promises and covenants set forth herein, the sufficiency of which are hereby acknowledged, the City and Consultant agree as follows: 1. Scope of Work Order. Consultant agrees to provide, perform and complete all the services requested by the City in this Work Order and attached Exhibit 1 (“Work”), which Work shall be subject to the terms and conditions of this Work Order and the Contract. 2. Term of Work Order. All Work requested by this Work Order shall be completed by December 31, 2023. 3. Compensation for Work Order. City agrees to pay the Consultant an hourly, not-to- exceed sum of $34,900.00 as full and complete payment for the Work requested by this Work Order. 4. Consultant Representative. Consultant has designated Jake Newhall to manage the Work Order subject to the supervision of Consultant’s representative. ISSUED BY CITY OF PRIOR LAKE Mayor City Manager RECEIVED AND ACCEPTED BY WSB & ASSOCIATES, INC. Signature Title Page 2 of 2 Exhibit 1 – Scope of Work Order G:\Group Data\WATER RESOURCES\WR Proposal Folder\Prior Lake\LTR PROP-p young_MarkleyErosionFinalDesign_010623.docx 701 XENIA AVENUE S | SUITE 300 | MINNEAPOLIS, MN | 55416 | 763.541.4800 | WSBENG.COM January 6, 2023 Pete Young Water Resources Engineer City of Prior Lake 4646 Dakota Street SE Prior Lake, MN 55372 Re: Proposal to Provide Final Design and Construction for Markley Lake Ravine Stabilization Project City of Prior Lake, MN Dear Mr. Young: Attached for your review and approval is our proposed scope of services, fee, and schedule for providing professional engineering services to complete the final design and construction for the Markley Lake Ravine Stabilization Project. WSB has visited the site with the City and preliminary design has been completed to help understand the extent and benefit of the potential improvements. We are excited to continue to work with you on this project. If you are in agreement with this proposal, please sign where indicated below and return one copy. The necessary contract documents will then be provided. WSB will start work upon receipt of a signed contract. Please do not hesitate to contact Jake at 612- 990- 3576 with any questions. Sincerely, WSB Jake Newhall, PE Director Mr. Pete Young January 6, 2023 Page 2 SCOPE OF ENGINEERING SERVICES FOR MARKLEY LAKE RAVINE STABILIZATION PROJECT FINAL DESIGN & CONSTRUCTION FOR THE CITY OF PRIOR LAKE SCOPE OF ENGINEERING SERVICES This work plan consists of the final design and construction tasks for the Markley Lake Ravine Stabilization Project for the City of Prior Lake. The following are the tasks that will be included: Task 1 – Project Management ($3,500) Project management will be performed throughout the course of the project. The following subtasks are included as part of Project Management: 1.1 Attend project update meetings with City staff to discuss draft plans, final plans, cost estimates, bidding, and other project variables. This will include developing agendas, preparing handouts and graphics, and attending meetings. 1.2 Work with project team and the City to coordinate project deliverables, schedule, and budget. Deliverables: Two (2) meetings with City staff to review draft plans and final plans. Task 2 – Collect Background Info ($5,300) This task consists of collecting background data and relevant design information for the project. The following are the subtasks that will be included as part of the evaluation: 2.1 Collect background information including: easement information, storm sewer sizes and elevations, soils information, existing hydrologic modeling for the area, groundwater information, permitting requirements, and other relevant information. 2.2 Topographic survey of the ravine area will be performed by WSB. This will include surveying property lines, culverts, trees, and other items within the anticipated construction limits. It is important to note that this task does not include geotechnical analysis as it is not anticipated to be needed. If it is determined that a geotechnical investigation is needed this can be provided as an additional service. Deliverables: Topographic Survey Information. Task 3 – Construction Documents ($13,600) This task consists of completing construction plans, specifications, and bidding documents for the Markley Ravine Stabilization Project. A site visit to walk the project area is planned to help develop an informed design regarding trees, existing infrastructure, access concerns, private property, and other variables. The preliminary design memo will be utilized as well. Plans are anticipated to include cover sheet, grading plan, erosion control/restoration, and details. An updated cost estimate will be developed to verify consistency between the proposed improvements and the City project budget. This scope assumes answering questions during the bid process to help facilitate the understanding of construction expectations. 3.1 Prepare draft construction plans, specification, and updated cost estimate. Mr. Pete Young June 17, 2020 Page 3 3.2 Finalize construction plans, specification, and bidding documents based on feedback from City staff. Deliverables: Final Plans, Specifications, and Bid Documents. Note it is not anticipated that Army Corps or Watershed Permitting will be required. Task 4 – Construction Management ($12,500) Construction management will be performed throughout the course of the construction schedule for the Markley Ravine Stabilization Project. This will include attending the pre-construction meeting as well as weekly progress meetings throughout the project, and other necessary construction coordination. This task will include part-time observation (approximately 15-20 hours per week). This will include inspection of all critical construction components as well as regular check -ins with the contractor and the City. WSB will also perform the necessary construction staking and survey work. This includes any necessary survey for record drawings. 4.1 Attend weekly construction meetings. 4.2 Part-time construction observation. 4.3 Review and approve pay vouchers. 4.4 Construction staking and record drawings. Deliverables: Construction Meetings, Construction Observation, Construction Staking, Record Drawings. TOTAL ESTIMATED ENGINEERING FEE The cost to provide the scope of services outlined in this proposal will be billed hourly, based on our current hourly rates. We are proposing to complete the Markley Lake Ravine Stabilization Project for an hourly not-to-exceed fee of $34,900. TIME SCHEDULE Based on the current project schedule, WSB proposes to complete the construction documents by August of 2023 to allow for bidding and construction in the fall of 2023. MARKL E Y L A KECTS E CREDITRIVER R D SE INDUSTRIAL CIR SEWELCOMEAVESEScott County GIS 16 27 12 83 42 44 17 82 18 78 14 21 This product is for informational purposes and is not suitable for legal, engineering, or surveying purposes. This product has been produced by the City of Prior Lake for the sole purpose of geographic reference. No warranty is made by the City of Prior Lake regarding specific accuracy or completeness.0 0.03 0.05 0.08 0. 1 Miles Markley Lake Ravine Stabilization Project Council Item Location Map 3/