Mn/DOT Contract #00520

This is aplanning level hydrology /hydraulicstudy in West-Central Minnesota (TH 34 Clay and Ottertail, TH 55 Grant, TH 59 Grant County, TH 10 Ottertail County, and TH 108 Ottertail County). The purpose of this study isto determine how to best manage resources for threatened infrastructure due to potential roadway flooding in areas where water is threatening the road.

The evaluation of each identified basin will include mapping the basin, the probability of the water level will reach a critical or overtopping elevation, a timeframe for that occurrence, and an assessment of potential risks or issues associated with possible corrective actions. A preferred alternative, drainage solutions (i.e. identify possible outlets) verses structural improvements (i.e. road raises), will be develop including associated costs of each and the likely timeframe needed for Mn/DOT to implement the solution.

1.0Project Management (the Activity Code for this work is 1065)

This task focuses on effective coordination of the contract work to expedite the decision-making process and maintain the scheduled completion dates. Contractor involvement is anticipated for 9 months from Notice to Proceed.

1.1Prepare work-planning schedule and coordination of all required tasks.

1.2Establish ongoing project coordination with State (bi-weekly phone conversations including agenda, meeting minutes, and progress reports).

1.3Prepare for and attend meetings deemed necessary by State’s Project Manager (including preparation of agendas and meeting minutes and submission to all attendees).

1.3.1Kickoff meeting: Attend meeting with State staff in Detroit Lakes to receive data and information

1.3.2Prepare for and conduct public meetings to gather information for the possible outlet options. (assume 6 public meetings)

Task 1.0 Deliverables:

Contractor

  • Project Schedule (work-planning)
  • Coordination of all required tasks
  • Establish ongoing project coordination with State
  • Prepare for and attend all meetings as needed (including preparation of agendas, presentations, meeting minutes, and recording of all public comments)
  • Public and Agency coordination
  • Monthly invoices and progress reports
  • Document and organized all materials from this project (this will include all computations, topography mapping, aerials, survey information, meeting information for all alternatives looked into)
  • Three (3) paper copies composed in a book of study
  • One (1) electronic version of the study on a jump drive in Portable Document Format (PDF) file
  • One (1) electronic version of all the information used in the study on a jump drive in word, excel, or appropriate program that was used

State

  • Provide meeting location for open houses

SURVEY WORK (This Activity Code for this work is 1040)

This task will include collecting miscellaneous survey data needed to verify critical points as needed (ie-culvert inlets, outlets, basin outlet, road elevation, current water elevation). It is anticipated that the majority of the survey information will be from lydar and topography maps. (Assume 6 days of a two person survey crew throughout the length of the study)

1.4All survey data collected shall be National Geodetic Vertical Datum (NGVD29) (to be consistent with historical Department of Natural Resources (DNR) data)

Task 2.0 Deliverables:

Contractor

  • .dgn drawing in Microstation Version 8 with collected information
  • .gpk of profiles points and break lines
  • Profile sheets with station and elevation labeled. Show culvert crossings on profile.
  • Ascii text coordinate files of points collected in the field.
  • Provide current and historical topographic survey data
  • Lidar files used

State

  • Table listing point and mapping codes

2.0Hydraulic Analysis, alternatives and feasibility analysis and report (The activity code for this work is 1141)

This task focuses on collecting historic and current information and evaluating it to determine the preferred alternative for the threatened road way. This task also includes prioritizing the locations for most efficient use of trunk highway resources.

2.1Conduct historic research to document area precipitation, soil types, and conditions effecting groundwater level or other factors to predict future water levels.

2.2 Conduct historical data review of lakes and channels affecting roadways. Document historic water elevation fluctuations and elevations

2.3Gather and research old road plans off intranet

2.4Map the basin and contributing drainage area. Provide maps of historic water elevations (aerials may be used to show the increase in size) and measure the areas

2.5Determine the basin water elevation at which a natural outlet would occur. Determine the size of the flooded area at this elevation, map where the water would flow to naturally outlet, what issue would occur if this were to happen

2.6Using Engineering judgment determine the timeframe in which that critical elevation may be reached

2.7Develop the highway grade raise alternative

2.7.1Determine the grade raise elevation and length of road needed to be raised

2.7.2Determine the stage increase caused by the grade raise and if a culvert could be used under the highway to mitigate this stage increase

2.8Develop outlet alternatives and determine a preferred outlet option.

2.8.1Provide a hydraulic analysis for the preferred outlet as basis for the outlet design (ie- elevation of inlet/outlet, size the pipe, pump, time, flow, estimate amount of grading)

2.8.2Address the preferred outlet’s operation and maintenance plan key points needed to address downstream concerns and trunk highway needs

2.9Evaluate the outlet, grade raise, and do nothing alternatives selecting a preferredsolution for each basin

2.9.1Develop preliminary hydraulic design of the outlets

2.9.2Consider service life costs for alternatives including maintenance and operation costs

2.9.3Determine the desired basin draw down elevation

2.9.4Determine effects on area lakes and channels

2.9.5Identify potential liability

2.9.6Identify obstacles such as environmentally sensitive areas, large utility relocations, no sufficient downstream outlet, or other

2.9.7Determine needed agencies involvement

2.9.7.1Coordinate with other agencies (ie CORPS, County Land and Resources, Soil and Water, DNR, USFWS, MPCA, Local Watershed, County Drainage Authority). Determine what permits will be required, along with possible time to obtain and obstacles that may prevent acquiring a permit

2.9.7.2Coordinate with general public, township, lake association, and individual landowner meetings, as needed.

2.9.8Delineate affected wetlands based on outlet alignments or fill for grade raise to determine potential wetland impacts and determine mitigation cost or avoidance options

2.9.8.1Request land access permission from landowners

2.9.9Identify permanent and temporary right of way needs

2.9.10Identify the issues faced by raising the road or out letting (i.e. No natural outlet, upstream and downstream impacts, environmental issues caused by a road)

2.9.11Identify potential timeframesfor final plans, right of way,permits and obstacles that may affect the time for each alternative

2.9.12Determine costsfor each alternative (i.e. ROW, construction, engineering, maintenance, utility relocates (gopher one call), and cost for permit requirements including mitigation)

2.10Prioritize basins having shortest timeframe before road will overtops including traffic volumes, available detours, costs, and time required to construct

2.11Develop trigger elevations when design would need to begin to avoid the road being flooded (These elevations will be needed in North American Vertical Datum (NAVD) 88).

Task 3.0 Deliverables:

Contractor

  • Document and organized all materials from this section (this is discussed in project management)
  • Alternatives analysis and report
  • Hydraulic report
  • Map of possible outlets for each basin
  • Preliminary construction limits for preferred alternatives
  • Prepare for and attend a public meeting for each basin with necessary exhibits and presentation materials for possible outlet options
  • Document decisions made and rational used
  • Labeled calculations that are easily understandable, parameters used, and assumptions made listed in an appendix.
  • Agencies letters with their concerns
  • Note relevant old plans
  • Cost estimates excel format
  • Mapping from gopher one calls
  • Prioritized basins list, with trigger points and timeframe

SCHEDULE: Anticipating April 2012 start and a November 2012 completion

  • Project review and information gathering (April 2012)
  • Survey information, preliminary hydraulic design, agencies contacts, alternatives developed (April-August 2012)
  • District presentation, revisions (September 2012)
  • Public meeting (October 2012)
  • Hydraulic design, cost estimates, basin prioritization, District meeting & review (October)
  • Final (November 2012)

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