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1f. Bluff Creek Ravine 2: Approve Quote CITY OF CHANHASSEN 7700 Market Boulevard PO Box 147 Chanhassen, MN 55317 Administration Phone 952.227.1100 Fax: 952.227.1110 Building Inspections Phone: 952.227.1180 Fax: 952.227.1190 Engineering Phone: 952.227.1160 Fax: 952.227.1170 Finance Phone: 952.227.1140 Fax: 952.227.1110 Park & Recreation Phone: 952.227.1120 Fax: 952.227.1110 Recreation Center 2310 Coulter Boulevard Phone: 952.227.1400 Fax 952.227.1404 Planning & Natural Resources Phone 952.227.1130 Fax: 952.227.1110 Public Works 1591 Park Road Phone: 952.227.1300 Fax: 952.227.1310 Senior Center Phone 952.227.1125 Fax 952.227.1110 Web Site VfflW.ci .chanhassen. mn. us ~ MEMORANDUM TO: ~:;::> 0 Paul Oehme, Director of Public Works/City Engineer \, Terry Jeffery, Water Resources COOrdjn~ W' March 24, 2008 FROM: DATE: SUBJECT: Bluff Creek Ravine #2 Stabilization Project No. SWMPI2-22A: Approve Contract Quote for Installation of Drop Structures REQUESTED ACTION (Simple Majority Vote Required) City Council is recommended to authorize the quote and approve the construction contract in the amount of $28,770.00 with Parrott Contracting Inc. for the above referenced project. BACKGROUND Bluff Creek is listed as a stream which is impaired for turbidity and fish biological indices. The Minnesota Pollution Control Agency has recently begun the Total Maximum Daily Load study and implementation plan for Bluff Creek. This will build upon the past research which has been performed on Bluff Creek. In particular, Barr Engineering assessed the gullies and escarpments along the Bluff Creek Corridor which are depositing sediment within Bluff Creek. This study identified twenty two (22) occurrences of ravine or bank erosion along the corridor. This particular area is identified as Ravine #2 and is classified as severely eroded. Staff has discussed with the owner of the property that contains the majority of the ravine and the Minnesota Department of Transportation (MnDot) about stabilizing the ravine. Staff met on-site with the owner and MnDot to discuss the issue in greater detail. : -.-... ! .--..-_. : '::::= =:=-- : -- ---.: e>.. _._- : ---~.. : <;} II~ MnDot is planning to stabilizing the eastern fork of Ravine #2 in conjunction or before the scheduled mill and overlay for Highway 101. The mill and overlay project is scheduled to occur in 2009. It would be beneficial to coordinate the work of stabilizing the west ravine, which is the City's responsibly, with the work MnDot plans to complete on the east branch. This coordination will allow for access to the site as well as an area from which construction can be staged. Space is otherwise limited due to steep slopes and heavy forest cover. The City of Chanhassen · A growingdRIffiI<.l(~wJlitPIfR~IS\VIJI~\i~YA~9~~.tf~rmlQQc9~'!I~Wl%JQhif'jRQ:Rb\%(8mo~'a~~mljQ~~[ij~~oend beautiful parks. A great place to live, work, and play. Paul Oehme March 24, 2008 SWMPI2-22A, Ravine #2 Page 2 In addition to stabilizing the ravine, it will be necessary to address the current condition of the outlet from Mandan Circle. Currently, water is directed to a catch basin which discharges through an above-ground, 12-inch corrugated metal pipe (CMP) into the ravine. The outlet for the CMP is elevated approximately ten feet above the bottom of the ravine t / * .... . "'.r it thereby increasing the force of the \- ~. water as it enters the channel and eroding the ravine more. In an effort to address this issue now, staff is proposing to install a drop structure on Mandan Circle and directionally bore a high density polyethylene pipe (HDPE) to a second drop structure prior to discharging into the ravine. This will act to dissipate the energy at the outfall and minimize the erosive force of the runoff into the channel. Rip rap will be placed at the outlet to further dissipate energy. In the future, the pipe should be extended down the bluff to further minimize erosion of the ravine and bluff. On March I, 2008, quotes for this cleanout were requested from Kusske Construction Company and Parrott Contracting. The two quotes were received and are summarized as follows: Parrott GM Submitted Prior To The Deadline ./ ./ V olume of Cleanout ./ ./ Offsite Disposal of Materials ./ ./ Site Restoration ./ ./ Base Fee $28,770 $43,335.64 Based upon the two quotes received, staff is recommending approving the lesser quote submitted by Parrott Contracting Inc. and authorizing the structure installation by Parrott Contracting for $28,770. Parrott Contracting has completed numerous projects for the City. Their work has been acceptable. Detailed Work Plan The scope of the project includes: Task 1: Remove the existing pipe and catch basin manhole structure Task 2: Install new drop structure Task 3: Directionally bore 125 feet of HDPE G:IENGISWMP PROJECTSISWMPI2.22A. BlutTCrk Channel Ravine 2-Mandan Cirelel032408 approve-quote. doe Paul Oehme March 24, 2008 SWMPI2-22A, Ravine #2 Page 3 Task 4: Apply erosion control blanket over disturbed areas. Task 5: Replace geotextile fabric and rip rap at outlet SCHEDULE If this project moves forward, staff anticipates the following; project schedule: Award Consultant Contract March 24, 2008 Send Letters to Neighbors March 25,2008 Start Construction After road restrictions are lifted Construction Complete Late May, 2008 FUNDING Funding for this project is anticipated to come from the CIP SWMP-024. A total of $150,000 has been budgeted to address construction and restoration as recommended within the Bluff Creek Natural Resources ManagementPlan for the 2008 fiscal year. This project is the first phase of the Bluff Creek Management Plan for 2008. Staff is planning to make improvements to the rest of the ravine #2 in late 2008 or early 2009. RECOMMENDATION Move to approve the quote submitted by Parrott Contracting in the amount of $28,770.00 and authorize the improvements as discussed in this background. Attachment: CIP Page G:\ENG\SWMP PROJECTS\SWMP12-22A - BluffCrk Channel Ravine 2-Mandan Circle\032408 approve-quotc.doc Capital Improvement Program City of Chanhassen, MN 2008 thru 2012 Contact Unassigned Department Surface Water Management Project # SWMP-024 ProjectName Bluff Cr. Nat. Resources Mgmt Plan Implementation Account # 1 720-0000-4751 Account #2 Account # 3 Type hnprovement Useful Life Unassigned Category SWMP Priority nla Total Project Cost $900,000 Description Construction and restoration as recommended in the Bluff Creek Natural Resource Management Plan. It is unknown how much funding the Riley- Purgatory-Bluff Creek Watershed District wiIl contribute to this project. Will assist in achieving compliance with NPDES Phase II MS4 Permit. Justification Implementation of recommendations in 1996 Bluff Creek Natural Resource Management Plan in cooperation with the Riley-Purgatory-BluffCreek Watershed District. These projects will improve habitat and aesthetics in the Bluff Creek Watershed. Prior 150,000 I Total Expenditures Construction Total Prior 150,000 I Total Funding Sources Surface Water Utility Fund Total 2008 150,000 150,000 2009 150,000 150,000 2010 150,000 150,000 2008 150,000 150,000 2009 150,000 150,000 2010 150,000 150,000 Operational Impact/Other The restored areas wiIl require regular maintenance to sustain the native plant communities. 109 2011 150,000 150,000 2011 150,000 150,000 2012 150,000 150,000 2012 150,000 150,000 Total 750,000 750,000 Total 750,000 750,000 ;- I I I ii' :'1" ~ I J I ~ 1:1 I!