Information for File # JTF

Transcription

1 Information for File # JTF Applicant U.S. Department of Transportation s Central Federal Lands Highway Division (CFLHD) on behalf of the Fond du Lac Indian Reservation Corps Contact Josh Fitzpatrick Address 1554 Highway 2, Suite 2, Two Harbors, MN joshua.t.fitzpatrick@usace.army.mil Phone (651) Primary County Carlton County Sec/Township/Range: NE ¼, NE ¼, Sec. 9, T. 49N., R. 17W. Information Complete On April 3, 2013 Posting Expires On April 12, 2013 Authorization Type LOP-10-FDL This application is being reviewed in accordance with the practices for documenting Corps jurisdiction under Sections 9 & 10 of the Rivers and Harbor Act of 1899 and Section 404 of the Clean Water Act identified in Regulatory Guidance Letter We have made a preliminary determination that the aquatic resources that would be impacted by the proposed project are regulated by the Corps of Engineers under Section 404 of the Clean Water Act. Our jurisdictional review and final jurisdictional determination could result in modifications to the scope of the project s regulated waterbody/wetland impacts and compensatory mitigation requirements identified above. An approved jurisdictional determination will be made prior to reaching a permit decision, and will be posted on the St. Paul District web page at PROJECT PURPOSE & NEED: The project proposes to replace a washed out bridge on Reservation Road across Fond du Lac Creek on the Fond du Lac Indian Reservation. The work is needed to restore safety and functionality of the roadway. The roadway is currently impassible and closed to vehicle and pedestrian traffic. The repair efforts will help prevent further damage and debris that may occur from future rain events. The proposed repairs will also restore fish passage in Fond du Lac Creek, a designated trout stream. 1

2 This site is maintained by the Fond du Lac Tribe. This road provides access to a residential area that is currently using a detour around the site to access homes. This roadway is also used by emergency response vehicles, such as ambulances, police cars, and school buses. Emergency access time has increased by 15 minutes to 32 tribal housing units due to the road failure. The repairs will not only re-establish safe access to these homes, but also stabilize the slopes for future weather-related events. PROJECT DESCRIPTION: The repairs are intended to be replaced in-kind to predisaster conditions; however, the existing six-foot culvert at this location is undersized and will likely fail again in the future from embankment piping, overtopping, or saturation anytime if a 10 to 20-year storm event occurs. The embankment failed approximately 20 years ago. The existing culvert was also impairing fish passage in Fond du Lac Creek, a designated trout stream. The repairs for this site will consist of constructing a bridge over Fond du Lac Creek with embankment stabilization to minimize the possibility of future failures due to similar storm events. The failed roadway will be repaired on either side of the bridge. The proposed new structure is a 115-foot single span bridge. The proposed structure type is a Precast/Prestressed girder superstructure with cast-in-place concrete decking that would provide economy, faster construction schedule, and low-maintenance. Approach slabs would be constructed at both ends of the bridge to alleviate the possibility of settlement of fill material at the bridge approaches. No retaining walls would be required based on the existing terrain and width of the bridge and roadway. Alignment of the proposed bridge would maintain the existing roadway alignment. The proposed overall deck width would be 33feet-4 inches, which includes two 12-foot lanes, two 3-foot shoulders and two 1-foot-8-inch Wyoming TL-3 curb mounted steel railings. The bridge deck would also have a cross slope of ft/ft from left to right moving up station. The steel railing meets traffic speeds of 60 mph or less, but there will be no change in speed limits on existing roadway. Abutments supported by steel H- piles shall be considered for this project. H-Piles shall be embedded to depths necessary to satisfy loading and scour requirements. Design loads for the proposed structure are based on AASHTO Bridge Design Specifications. Disturbance would occur within the existing failure area footprint, the existing roadway prism, and previously disturbed areas. Downed trees and debris within the slope failure will be removed, but no additional vegetation or tree removal is anticipated. Approximately 3,434 square feet of riprap would be discharged below the ordinary high water line of Fond du Lac Creek. Reservation Road is currently paved on both sides of the failure. The project would include asphalt resurfacing to match the existing roadway. 2

3 The anticipated length of construction at this site is estimated to be approximately 6 months. During this time, the roadway will remain closed. Anticipated construction equipment required for the repairs includes a backhoe, a front end loader, a compactor, a roller, a paver, a road grader, an asphalt saw, a crane and a dump truck. The erosion and sediment control design for the project would include the following: Silt fence installed at the toe of the fill slopes parallel to the toe. Erosion control log check dams used for erosion control in ditches. Bonded fiber matrix and potentially wattles would be installed on the channel slopes as well as the fill slopes. Watering for dust control Any additional requirements to obtain coverage under the Minnesota National Pollutant Discharge Elimination System (NPDES) Construction General Permit. NAME, AREA AND TYPES OF WATERS (INCLUDING WETLANDS) SUBJECT TO LOSS: The project would result in the discharge of 3,434 square feet of fill material on the bed of Fond du Lac Creek. ALTERNATIVES CONSIDERED: The no-build alternative was dismissed since it does not address the project need to restore a pre-existing roadway and provide adequate safety. A decision matrix was developed to weight four non-monetary decision criteria against each other, the four criteria are: Environmental Stewardship / fish passage, project schedule and delivery, longevity of the proposed structure, and the satisfaction of other agencies that have interest in the betterment of the Fond du Lac crossing. These criteria are weighted against each other to provide a weighted percentage and an importance ranking for each alternative. If one criterion is more important than another, it is selected over the other. The point of utilizing decision matrix analysis over engineering opinion is to objectively develop a non-bias weighting method and also provide an objective start to comparing multiple alternatives. Even though small changes in cost could escalate a concrete box alternative to have the highest benefit-cost-ratio (BCR), it does not necessarily imply that the box culvert is the optimal solution. During the stakeholder scoping meeting it was preferred that a structure that accommodates fish passage is more preferable even if it has a longer design and construction time frame. Where these two criteria cross, the Environmental Stewardship / Fish passage is selected over the criterion of schedule and longevity. The bridge alternative has the highest benefit score with a large plate arch culvert coming in second. This is expected since the two highest weighted criteria are fish passage and longevity of the structure. As mentioned, fish passage and environmental stewardship are important to the other agencies involved. The BCR scoring shows that the BCR of a bridge and box culvert are 3

4 similar, however, a standard box culvert will not provide the adequate geometry to allow for fish passage if it is selected. Based on alternative analyses, it is recommended to move forward with a bridge to replace the failed culvert crossing. Because of the height of the crossing, freeboard and capacity requirements will not govern the design of the bridge span or low chord elevation. Instead, the minimum span will be determined by minimizing the encroachment into the existing channel. The existing channel has an incised low flow channel of approximately 6 to 10 feet in width and then spreads into a wide floodplain. A riprap lining is recommended to protect the steep channel slope between the upstream and downstream cross sections at the bridge. The lining will also prevent channel incision that could potentially undermine the spill through abutments. COMPENSATORY MITIGATION: No permanent wetland impacts would result from the project, thus compensatory mitigation is not required. DRAWINGS: See attached. 4

5 Itasca +!:' Aitkin Project: MN ERFO 1 (1) Fond Du Lac Creek Bridge E::J USGS 24k Topo Map Boundaries Prepared by: Federal Highway Administration-Central Federal Lands Highway Division contract employee: Thomas Parker Date: March 2013 Background lmaaery USGS 7.5 min Quadrangles Iverson, Cloquet, Saginaw, and Brookston (Copyright: 2011 National Geographic Society, i-cubed) 1 inch = 5,000 feet :====::J Miles 0 2,550 5, ====::J Feet N A Figure 1: ERFO Location JTF Drawing 1 of 3

6 Project:. MN ERFO 1 (1) Fond Du Lac Creek Br1dge - NHDFiowline Freshwater Forested/Shrub Wetland Wetlands WETLANDS Estuarine and Marine Deepwater Estuarine and Marine Wetland Freshwater Emergent Wetland Freshwater Pond Lake Other Riverine JTF Drawing 2 of 3 1 inch = 250 feet :=:=:::J Miles ===:::::::1 Feet Background Imagery: Bing Maps Aerial Hybrid (Copyright: 2010 Microsoft Corp, and its data suppliers) Figure 2: Fond Du Lac Creek ERFO Location Prepared by: Federal Highway Administration Central Federal Lands Highway Division Date: March 2013

7 rv7 Attlil)lll I LocatmllJ I Impacted Feature I Area of Area of Water of the U S 3/27/2013 Fill: Removal: Fill: Removal: Area of Volume Area of Impact Volume Duratm ~ Impact Volume of Impact Volume of lmpact(ml) (ffi) of Impact (acre) Impact (Yd 3 of Impact ) (acre) Impact (Yd 3 ) (Yd 3 ) (Yd 3 ) Bridge Protectm~ r Be lowohwm rfond DuLac Creek I I Permanent Subtotal I =-1275 =-1270 =-1265 = = Measured ~long C Bctwv- 0 0 u~ ~ g~~ ;~~ Structure Transition Railing (typ.) ~ ~ ~ 2 tube curtl mount rail ~ ~ ~ Profile grade I~ ~ ~ ~~; ~: '""'"'eq:::: ~ "'"""' ' = =-1235 =-1230 Approximate location of exlstil\g ground C ClRdwy. MN63" P/5 conaete beam = = Foundation to tm1! detef"''ffned pending completion of geotechnical Investigation (typ.). = " H-piles (typ.) =-1210 = =-1200 ~ ::: Abut. 1 Approximate location of existing ground 0 20' 0" Lt. of C ~wy. ELEVATION Approximate location of existing ground C 16' 0" Rt. of C ~wy. ~ ~ Abut. 2.,.~~ofT~s.._ ~~!.: ()\ il 0... z 6 v ~()~q> ~-4T s of FIIMiliiHigh-yAclministnotion C.rtre!Federall&nds High-yOM.iDn Project: MN ERFO 1111 Fond DuLac Creek Bridge - OHWM(Q2) Topography Contour (1 ') -- Contour (5') JTF Drawing 3 of 3 1 inch = 20 feet ~ ~ Feet ~ l Miles ~- : F.. IUrl.. be~ lhowthe fllturt!o fo!id-d 'ftr.. offtiiuai inlquatlfeel (i.i. ID; IAII) Jickgroyndlmag rx jqar llrialln.gery compltlld by Horizon :.Orpo111tion for CFLHD in Sepcember 2005 Figure 3: Fond Du Lac Creek Bridge Area of Protection Below OHWM Date: March 2013