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Home My WebLink About20120040 Ver 1_Mitigation Information_20080305I � r F NCDQT will be replacing Bridge No. 2 on US 151501 over the CSX Railroad in Moore County (TIP Project B- 3680). The project will result in 0.49 acres of wetland impact. In order to mitigate for these impacts, NCDQT is proposing on -site wetland mitigation adjacent to the project. NCDOT is proposing to create 2.0 acres of wetland mitigation area and 118 linear feet of stream restoration by removing a 5'x5' box culvert in the area. NCDQT intends to provide the 0.49 acres of wetland mitigation in the on -site mitigation area (using a 1:1 mitigation ratio). The remaining 1.51 acres of mitigation and 118 linear feet of stream restoration will remain as on -site assets. Wetland mitigation will consist of removing the existing causeway fill (road) and grading the area based on adjacent wetland elevations. The area will be planted with native species at a density of 680 seedlings per acre. NCDQT will conduct monitoring for both hydrologic and vegetative success (five years or until successful). Stream restoration will consist of removing the existing 5'x5' box culvert, which carries an unnamed tributary to Aberdeen Creek. The channel will be daylighted and the appropriate channel dimensions restored to the previously impacted area. NCDQT will conduct monitoring activities as required (five years or until successful). NCDQT has requested D WQ's input on the proposed wetland mitigation area and stream restoration site. DWQ staff visited the site on March 17, 2008. Based on the site visit, DWQ believes that providing 118 linear feet of stream restoration in this area is achievable. However, if the culvert is providing grade control in this section of stream, its removal may cause some stream instability (headcuts). These issues would need to be adequately addressed as part of the restoration plan. While DWQ believes that creating wetland hydrology will be successful, staff is concerned about the vegetative element of the site. The south side of the project is heavily infested with Chinese privet (Ligustrum sinense). The north side of the project contains some privet, but is not as heavily infested as the south side. Since privet is aggressive, forms dense thickets and is difficult to eradicate, DWQ is concerned about the site's ability to meet vegetative success. In addition, the privet exists on the adjacent /abutting property(s). Without adequately addressing the adjacent off -site infestation, NCDQT may have difficulty controlling it in the mitigation area. In order for DWQ to provide full mitigation credit, the area must not contain more than 10% privet (or 10% woody stems per acre) at mitigation closeout. NCDQT should be aware that it may take longer than 5 years to receive full mitigation credit or that only partial mitigation credit can be given if the mitigation area contains more than 10% privet upon completion of the standard monitoring period. Hopefully, increasing the hydroperiod in the area will help reduce the spread /establishment of privet.. If you have any questions or need additional information, please let me know. Thank you for the opportunity to provide input on this project. Aberdeen Creek Wetland and Stream Restoration Plan At the Replacement of Bridge No. 2 On US 15/501 Over the CSX Railroad Moore County, North Carolina Reference TIP B -3680 Federal Aid Project No. BRSTP- 15(11) WBS No. 33222.1.1 March 3, 2008 The North Carolina Department of Transportation (NCDOT) will perform on -site mitigation for wetland impacts associated with the replacement of Bridge No. 2 on US 151501 over the CSX Railroad. This mitigation site occurs adjacent to Transportation Improvement Program (TIP) B -3680. The selected alternative for this project is replacement 60 ft. west of the existing 216 ft. two -lane structure with a 780 ft. five -lane structure. The NCDOT proposes to restore approximately 2.0 acres of riverine wetland and 118 ft. of stream by removing the causeway fill and associated box culvert of the existing bridge to design contours remnant of natural grade. The replacement of Bridge No. 2 will result in 0.49 acres of wetland impacts, which will be offset at a 1:1 ratio by the purposed mitigation site. In addition to offsetting the TIP project impacts, 1.51 acres of wetland and 118 ft. of stream will remain as onsite assets. Existing Conditions The project is located in the Town of Aberdeen on US 151501 north of the intersection of NC 211 in Moore County. The Categorical Exclusion (CE) for TIP B -3680, dated September 2006, provides further details concerning existing natural resources and roadway conditions. Bridge No. 2 is located approximately 1000 ft. south of the intersection of US 151501 and US 1. The roadway of US 151501 north of the bridge is on a high causeway fill - section within the floodplain of Aberdeen Creek. Jurisdictional wetlands occur on both the east and west sides through this section of roadway. A 118 ft. long 5'x5' box culvert is located approximately 300 ft. north of the bridge. The culvert carries an unnamed tributary to Aberdeen Creek under the roadway from east to west where it comes to a confluence with Aberdeen Creek. Proposed Conditions The proposed mitigation site will be approximately 2.0 acres of riverine wetland restoration and 118 ft. of stream restoration. Restoration will involve the removal of the existing causeway fill and associated box culvert. The fill- section will be graded down to target elevations based on adjacent wetlands. The unnamed tributary to Aberdeen Creek will be day - lighted and the channel will be reestablished in existing location with correct dimensions and flood plain tie -in. The mitigation site will be retained in right of way to protect the site in perpetuity. The Natural Environment Unit will provide construction oversight to ensure the mitigation site is constructed properly. Vegetation Planting Planting of native species will be performed within the restoration area by the NCDOT at the density rate of 680 seedlings per acre, which equates to a planting space of about 8' on center. Monitoring Upon the successful completion of the site construction, the following monitoring strategy is proposed for the mitigation site. NCDOT will document monitoring activities on the site in an annual report distributed to the regulatory agencies for a minimum period of five years or until the site is considered successful. Hydrologic Monitoring Ground water gauges will be installed in both existing adjacent wetland and the proposed wetland restoration site. Monitoring will begin upon the completion of the site construction. Vegetation Success Criteria NCDOT shall monitor the restoration site by visual observation and vegetation plots for survival and coverage of vegetation. Monitoring will be initiated upon the completion of planting. u ti U ti 0 4 ti h See Sleet I-A For Index of Sleets w ,1 PROS PROJECT aaaao 15 VICINITY MAP EAST SAWERS AVE l STA �NCXT Ore, 6D,T04, � GRAPHIC SCALES DESIGN DATA 50 25 v 50 10o MAN ARTE119 11T ION = 16,200 PLANS ADT 2049 = 441600 50 25 0 50 100 DHV = 10% D A 55 �O PROFILE �HORIIONT4 T 11 % ` 5 0 5 10 V 50 MPH PR ' MT 7 % +DUAL 4 10 STATE OF NORTH CAROLINA DIVISION OF HIGHWAYS MOORS COUNTY LOCATION; BRIDGE NO, 2 ON US 5501 OVER CSK TRANSPORTATION AND ABERDEEN CAROLINA & WESTERN RAILROADS IN ABERDEEN TYPE OIL WORK, GRADING, PAVING, DRAINAGE, SIGNAL, AND STRUCTURE KojooPOST Ng h BRD CONSTRUCTION $r 1I US j�01 h I 0 / N R1n RAn yam RWRIM NA sirs ua MTAL span i STAII OF NORIN CAROLM 8 -3680 q L 0 N ROTE I AIA ROOM osspJPlHt! - 1944,1 _ _BaSTlSllll ----------- P8 ,I RIGHT OF WAY BAM DAVID L WAVER, PE SEP IWI 21, 2007 ROADWAY DESIGN PRa�cr °" ING=I °o t�► m STA 33 +51,41 A/ / i0 �u . -.00 -Y1- POT 1400.0 POT V114173 INCOMPLETE PLANS BR�B oa NOT V66 NR 0.1W dCONSITION \` PRELIMINARY PLANS DO NOT OSR OX CONURUMON 91.26 1� a 0 PROJECT 2NGTH IENGTH Of ROADWAY = 0,2a2 MMES LENGTH Of 51ROCi011E ■ 01189 MMES TOTAI LENGTH OP PROJECT = 0,41 MMES No3s, woo oN THIS PROACT sm BB PBRFoms To M LES BSTABusm BY METHOD TRis PRopeT Is PARMY LOCATED m 13 TOWN OF ABEDMIN MUNICIPAL BOUNDARY. 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