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Home My WebLink About20190188 Ver 1_W-5600_HYD_SMPv2.07_(20180517) (Oct 2016)_20190212��_��y�;�,��,�, North Carolina Department of Transportation �:`. 5i[]rtiltiv2iff'Y Hi hwa Stormwater Pro ram . �,,.,,.�;,.� J Y J - STORMWATER MANAGEMENT PLAN - (Version 2.07; Released October 2016) FOR NCDOT PROJECTS WBS Element: 50056.11 TIP No.: W-5600 County(ies): Johnston Page 1 of 5 General Project Information WBS Element: TIP Number: W-5600 Project Type: Roadway Widening Date: 9/25/2017 NCDOT Contact: Chad Coggins, Division Environmental Officer Contractor / Designer: Jim Davis, PE Address: 509 Ward Blvd. Address: �/�/etherill Engineering Inc. PO Box 3165 1223 Jones Franklin Rd. Wilson, NC 27895 Raleigh, NC 27606 Phone: (252) 640-6427 Phone: (919) 851-8077 Email: tccoaains(cD.ncdot.qov Email: Idavis(c�wetherillenq.com City/Town: Wilson Mills, NC County(ies): Johnston River Basin(s): Neuse CAMA County? No Wetlands within Project Limits? Yes Project Description Project Length (lin. miles or feet): 4.98 Surrounding Land Use: Mixture of agricultural, business and residential properties within the project area Proposed Project Existing Site Project Built-Upon Area (ac.) 93.3 ac. 53.0 ac. Typical Cross Section Description: Four-lane divided roadway with variable width median (30 to 64-feet wide). Project will Four-lane divided roadway with two 12-foot lanes, 4-foot wide paved outside add 10-foot outside and four-foot inside paved shoulders. Grassed median will vary from shoulders, and 2-foot paved inside shoulders in each direction. Eastbound and 26 feet to 22.4 feet in width. Interchanges will be provided at Swift Creek Road. and westbound lanes are separated by a variable width grassed median ranging from 30 to Wilson's Mills Road. Swift Creek Road and Wilson's Mill Road will be widened to four 46 feet wide. lanes through interchange area. Service roads will be provided adjacent to US 70. Project will upgrade US 70 to a full freeway. Annual Avg Daily Traffic (veh/hr/day): Design/Future: 45,400 Year: 2040 Existing: 30,700 Year: 2020 General Project Narrative: The purpose of the project is to upgrade US 70 to interstate standards. Access will be controlled and limited to the proposed interchanges at Swift Creek Rd. and Wilson Mills (Description of Minimization of Water Rd. In addition, services roads will be provided to allow access to adjacent properties. Project is located within the Neuse River Water Supply Watershed protected area and Quality Impacts) streams are classified as WS-IV Nutrient Sensitive Waters. No streams are listed on the 2012 Final 303(d) list of impaired waters. There are no High Quality waters, Outstanding Resource waters or water supply watersheds (WS-I or WS-II) located within one mile downstream of the project area. The numerous special ditches were designed to meet swale criteria where practicable to obtain treatment before discharging into the riparian buffers. From Sta. 158+50 -L- RT. to Sta. 164+75 -L- RT. fill slopes will be steepened to 1.5:1 and rock plated to avoid impacting Poplar Branch riparian buffers. Erosion control basins will be sized utilizing 25-year design storm intensity since the project is within an environmental sensitive area. Waterbody Information Surface Water Body (1): Little Poplar Creek NCDWR Stream Index No.: 27-41-1 NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply IV (WS-IV) Supplemental Classification: Nutrient Sensitive Waters (NSW) Other Stream Classification: None Impairments: nutrients Aquatic T8�E Species? No Comments: NRTR Stream ID: SB Buffer Rules in Effect: Neuse Project Includes Bridge Spanning Water Body? No Deck Drains Discharge Over Buffer? N/A Dissipator Pads Provided in Buffer? N/A Deck Drains Discharge Over Water Body? N/A (If yes, provide justification in the General Project Narrative) (If yes, describe in the General Project Narrative; if no, justify in the (If yes, provide justification in the General Project Narrative) General Project Narrative) �_i��W�� North Carolina Department of Transportation St�ar-��'r � ,,,,,,.,,,., Highway Stormwater Program STORMWATER MANAGEMENT PLAN -. (Version 2.07; Released October 2016) FOR NCDOT PROJECTS WBS Element: TIP No.: W-5600 County(ies): Johnston Page 2 of 5 Additional Waterbody Information Surface Water Body (2): Poplar Creek NCDWR Stream Index No.: 27-41 NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply IV (WS-IV) Supplemental Classification: Nutrient Sensitive Waters NSW Other Stream Classification: None Impairments: nutrients Aquatic T8�E Species? No Comments: NRTR Stream ID: SI Buffer Rules in Effect: Neuse Project Includes Bridge Spanning Water Body? No Deck Drains Discharge Over Buffer? N/A Dissipator Pads Provided in Buffer? N/A Deck Drains Discharge Over Water Body? N/A (If yes, provide justification in the General Project Narrative) (If yes, describe in the General Project Narrative; if no, justify in the (If yes, provide justification in the General Project Narrative) General Project Narrative) Surface Water Body (3): Neuse River NCDWR Stream Index No.: 27-(39.7) NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply IV (WS-IV) Supplemental Classification: Nutrient Sensitive Waters (NSW) Other Stream Classification: Impairments: nutrients Aquatic T�E Species? No Comments: NRTR Stream ID: ST Buffer Rules in Effect: Neuse Project Includes Bridge Spanning Water Body? No Deck Drains Discharge Over Buffer? N/A Dissipator Pads Provided in Buffer? N/A Deck Drains Discharge Over Water Body? N/A (If yes, provide justification in the General Project Narrative) (If yes, describe in the General Project Narrative; if no, justify in the (If yes, provide justification in the General Project Narrative) General Project Narrative) Surface Water Body (4): NCDWR Stream Index No.: NCDWR Surface Water Classification for Water Body Prima Classification: Supplemental Classification: Other Stream Classification: Impairments: Aquatic T8�E Species? Comments: NRTR Stream ID: Buffer Rules in Effect: Project Includes Bridge Spanning Water Body? Deck Drains Discharge Over Buffer? Dissipator Pads Provided in Buffer? Deck Drains Discharge Over Water Body? (If yes, provide justification in the General Project Narrative) (If yes, describe in the General Project Narrative; if no, justify in the (If yes, provide justification in the General Project Narrative) General Project Narrative) Surface Water Body (5): NCDWR Stream Index No.: NCDWR Surface Water Classification for Water Body Primary Classification: Supplemental Classification: Other Stream Classification: Impairments: Aquatic T&E Species? Comments: NRTR Stream ID: Buffer Rules in Effect: Project Includes Bridge Spanning Water Body? Deck Drains Discharge Over Buffer? Dissipator Pads Provided in Buffer? Deck Drains Discharge Over Water Body? (If yes, provide justification in the General Project Narrative) (If yes, describe in the General Project Narrative; if no, justify in the (If yes, provide justification in the General Project Narrative) General Project Narrative) Hi�;Flw�1y North Carolina Department of Transportation !��`�� '��9`�., St�rrYiyv�ter " -- ,,.,,,.,..,, Highway Stormwater Program - x" STORMWATER MANAGEMENT PLAN - " (Version 2.07; Released October 2016) FOR NCDOT PROJECTS WBS Element: 50056.11 TIP No.: W-5600 County(ies): Johnston Page 3 of 5 Swales Station 8� Coordinates Base Front Back Drainage Recommended Actual Longitudinal Rock BMP Sheet (Road and Non Road Surface Width Slope Slope Area Treatm't Length Length Slope Q2 V2 Q10 V10 Checks Associated w/ No. Projects) Water Body (ft) (H:1) (H:1) (ac) (ft) (ft) (%) (cfs) (fps) (cfs) (fps) Used Buffer Rules? 5 -L- 30+90 LT (1)Little 0.0 4.0 3.0 1.1 114 540 0.30% 3.5 1.1 4.5 1.2 No No 35.5918824° / -078.4002193° Poplar Creek 5 -L- 32+20 LT (1)Little 0.0 4.0 3.0 1.4 143 130 1.35% 4.5 1.2 5.8 2.2 No No 35.5917978° / -078.3998059° Poplar Creek 5& 6 -L- 36+23 LT (1)Little 0.0 4.0 3.0 5.4 538 403 0.30% 14.7 1.6 19.0 1.7 No No 35.5915953° / -078.3985022° Poplar Creek 6 -SR1- 24+58 LT (1)Little 8 0 3.0 3.0 9.9 990 250 0.30% 29.0 1.8 37.0 1.9 No Yes 35.5915175° / -078.3961029° Poplar Creek 6 -SR1- 27+73 LT (1)Little 8 0 3.0 3.0 9.9 990 250 0.30% 29.0 1.8 37.0 1.9 No Yes 35.5915285° / -078.3950636° Poplar Creek � -L- 53+50 RT (1)Little 0.0 6.0 3.0 0.4 44 250 0.31 % 1.5 0.8 2.0 0.9 No No 35.5910099° / -078.3927408° Poplar Creek � -L- 62+39 RT (1)Little 0.0 6.0 4.0 1.2 116 661 1.20% 3.6 1.7 4.7 1.8 No No 35.5909938° / -078.3897716° Poplar Creek � -SR2- 55+18 RT (1)Little 0.0 4.0 3.0 0.4 36 310 1.26% 1.2 1.4 1.5 1.5 No No 35.5908284° / -078.3897271 ° Poplar Creek � -L- 55+50 LT (1)Little 0.0 3.0 3.0 0.6 62 290 0.30% 2.3 1.0 3.0 1.0 No No 35.5914277° / -078.3920853° Poplar Creek � -L- 55+50 LT (1)Little 0.0 4.0 3.0 0.9 86 450 0.50% 2.3 1.2 3.6 1.3 No No 35.5914277° / -078.3920853° Poplar Creek 8 -L- 62+35 LT (1)Little 0.0 4.0 4.0 0.4 42 257 1.20% 1.4 1.5 1.8 1.5 No No 35.5914329° / -078.3897622° Poplar Creek 8 -L- 68+00 RT (1)Little 0.0 6.0 3.0 0.9 87 539 0.67% 2.7 1.3 3.5 1.4 No No 35.5912827° / -078.3878484° Poplar Creek 8 -L- 68+00 RT (1)Little 0.0 6.0 3.0 0.2 17 135 0.30% 0.6 0.7 0.8 0.7 No No 35.5907389° / -078.3879338° Poplar Creek 8 -SR2- 65+45 RT (1)Little 0.0 4.0 3.0 0.6 57 147 0.36% 0.4 1.5 0.6 1.6 No No 35.5905307° / -078.3863167° Poplar Creek 9 -SR1- 58+98 LT (1)Little 0.0 4.0 3.0 0.3 27 248 2.72% 0.5 1.5 0.6 1.6 No No 35.5912215° / -078.3845661 ° Poplar Creek 9 -SR2- 68+30 RT (1)Little 3.0 3.0 3.0 6.2 619 240 0.30% 35.5903081 °/-078.3854038° Poplar Creek 15.3 1.6 21.2 1.7 No No 9 -SR2- 76+78 RT (1)Little 0.0 4.0 3.0 2.2 222 690 0.30% 8.2 1.4 10.6 1.5 No Yes 35.5895285° / -078.3827382° Poplar Creek 10 -SR2- 75+60 RT (1)Little 0.0 3.0 3.0 2.2 216 788 0.30% 7.8 1.4 10.2 1.5 No No 35.5896543° / -078.3831024° Poplar Creek 11 -SR2- 96+87 LT (2)Poplar 0.0 3.0 3.0 1.5 149 337 0.30% 2.6 1.0 3.3 1.1 No No 35.5863652° / -078.3773817° Creek Additional Comments The second swale listed on Plan Sheet 9 has a drainage area of 6.2 acres. The required swale length base on drainage area is 619 ft.. Only 240 ft. of the ditch meets the 2-yr. velocity criteria of 2 fps or less. Water quality treatment is still provided for 39% of the contributing drainage area. The second swale listed on Plan Sheet 17 has a drainage area of 4.5 acres. 400 ft. of swale meets the 2-yr. velocity requirement and provides the required treatment for 89% of the drainage area. The swale shown on Plan Sheet 20 has a base width of 8 ft. in order to increase effective flow area and reduce velocity. It exceeds the recommended swale width by 2 ft. but still provides water quality treatment. The first swale on Plan Sheet 24 exceeds the allowable 2-yr. velocity by 0.4 fps. This is due to the longitudinal slope of 1.42%. Due to elevation constraints the ditch cannot be flattened enough to achieve 2 fps. The swale on Plan Sheet 6 at Sta. 24+58 -SR1- starts at the outlet of a 36" pipe. This pipe conveys flow from 9.9 acres of drainage area. There is not enough distance from where this swale begins to where it has to end just t i f w tl n t m t th n r I n th r ir m nt. Hi�;Flw�1y North Carolina Department of Transportation �:'.:�� 1y��, v �t�rrYiyv�ter � -- ,,.,..,, Highway Stormwater Program " STORMWATER MANAGEMENT PLAN (Version 2.07; Released October 2016) FOR NCDOT PROJECTS WBS Element: 50056.11 TIP No.: W-5600 County(ies): Johnston Page 4 of 5 Swales Station 8� Coordinates Base Front Back Drainage Recommended Actual Longitudinal Rock BMP Sheet (Road and Non Road Surface Width Slope Slope Area Treatm't Length Length Slope Q2 V2 Q10 V10 Checks Associated w/ No. Projects) Water Body (ft) (H:1) (H:1) (ac) (ft) (ft) (%) (cfs) (fps) (cfs) (fps) Used Buffer Rules? 11 -SR3- 10+40 LT (2)Poplar 0.0 4.0 3.0 0.9 85 348 0.94% 1.7 1.4 2.2 1.5 No No 35.5861175° / -078.3770051 ° Creek 13 -SR3- 28+30 LT (2)Poplar 3.0 3.0 3.0 0.8 83 300 1.34% 1.6 1.4 2.0 1.5 No No 35.5830539° / -078.3722954° Creek 15 -SR3- 52+00 LT (2)Poplar 0.0 3.0 3.0 0.2 19 300 0.30% 0.4 0.6 0.5 0.7 No No 35.5785255° / -078.3666245° Creek 15 -SR3- 63+00 LT (2)Poplar 0.0 3.0 3.0 0.4 35 220 0.40% 0.9 0.9 1.2 1.0 No No 35.5760094° / -078.3650089° Creek 15 -L- 162+90 LT (2)Poplar 8 0 4.0 4.0 7.6 760 190 0.30% 15.0 1.6 20.0 1.7 No Yes 35.5769249° / -078.3614962° Creek 16 -L- 163+60 LT (2)Poplar 14.0 4.0 4.0 14.1 1410 140 0.30% 21.0 1.5 27.0 1.6 No Yes 35.5768356° / -078.3612819° Creek �� -L- 179+67 LT (2)Poplar 0.0 3.0 3.0 1.7 166 183 1.16% 3.4 1.8 4.4 2.0 No No 35.5740252° / -078.3571457° Creek �� -L- 175+50 LT (2)Poplar 0.0 3.0 3.0 4.5 445 417 0.58% 9.4 1.8 12.3 2.0 No No 35.5747507° / -078.3581988° Creek 18 -L- 189+41 LT (2)Poplar 0.0 3.0 3.0 1.1 110 141 1.40% 2.7 1.9 3.5 2.0 No No 35.5729631 ° / -078.3542554° Creek 19 -Y9RPB- 11+95 LT (2)Poplar 0.0 5.0 6.0 0.5 46 291 0.50% 8.2 1.5 10.6 1.8 No No 35.5723465° / -078.3494229° Creek 19 -Y9RPB- 14+86 LT (2)Poplar 0.0 3.0 3.0 0.8 78 499 0.74% 1.3 1.2 1.7 1.3 No No 35.5721515° / -078.3484753° Creek 19 -Y9RPC- 10+10 RT (2)Poplar 8 0 3.0 3.0 6.7 670 148 0.30% 23.0 1.7 30.0 1.8 No Yes 35.5718424° / -078.3502100° Creek 19 & 20 'WBL- 10+69 LT (2)Poplar 4.0 3.0 3.0 3.9 394 1158 0.54% 8.5 1.7 11.0 1.8 No No 35.5727552° / -078.3510425° Creek 20 -Y9RPA- 22+20 RT (3)Neuse 8 0 3.0 3.0 2.1 206 195 0.30% 4.5 1.0 6.6 1.1 No Yes 35.5706221 ° / -078.3439036° River 2� -SR7- 16+50 LT (3)Neuse 0.0 4.0 3.0 1.2 120 287 1.89% 0.9 1.5 4.4 1.7 No No 35.5689114° / -078.3409187° River 24 -L- 261+20 RT (3)Neuse 0.0 3.0 3.0 2.1 210 1430 1.42% 6.1 2.3 7.9 2.4 No Yes 35.5628373° / -078.3341606° River 24 -L- 264+88 RT (3)Neuse 0.0 3.0 3.0 1.5 154 1062 0.40% 4.5 1.3 5.8 1.4 No No 35.5621937° / -078.3332056° River 24 & 25 'L- 276+00 LT (3)Neuse 0.0 3.0 3.0 1.4 135 500 0.30% 3.2 1.1 4.1 1.2 No No 35.5605002° / -078.3300508° River 14 &15 -Y7RPC- 26+84 RT (2)Poplar 0.0 6.0 4.0 2.0 195 715 0.30% 3.6 1.0 4.6 1.1 No No 35.5772158° / -078.3656334° Creek Additional Comments The swale on Plan Sheet 19 at Sta. 10+00 -Y9RPC- starts at the outlets of an 18" pipe and a 24" pipe, receiving flow from 6.7 acres of drainage area. There is not enough length available from where the swale begins to where it has to end prior to entering a wetland to meet the necessary length requirement. The swale on Plan Sheet 24 at Sta. 261+20 -L- is 1430 feet in total length and receives drainage from 2.1 acres. The velocity of 2.3 fps that is shown is along a section of ditch that is on a 1.42% grade. This section of ditch is only 50 feet in length and is the only part of ditch that does not meet the swale criteria. Hi�;Flw�1y North Carolina Department of Transportation ,"��,V,,,y±"v� �t�rrYiyv�ter -- ,,.,,,.,..,, Highway Stormwater Program = �r STORMWATER MANAGEMENT PLAN _ (Version 2.07; Released October 2016) FOR NCDOT PROJECTS WBS Element: 50056.11 TIP No.: W-5600 County(ies): Johnston Page 5 of 5 Swales Station 8� Coordinates Base Front Back Drainage Recommended Actual Longitudinal Rock BMP Sheet (Road and Non Road Surface Width Slope Slope Area Treatm't Length Length Slope Q2 V2 Q10 V10 Checks Associated w/ No. Projects) Water Body (ft) (H:1) (H:1) (ac) (ft) (ft) (%) (cfs) (fps) (cfs) (fps) Used Buffer Rules? 15 -Y7RPC- 26+84 RT (2)Poplar 0.0 6.0 4.0 0.7 66 264 0.82% 0.9 1.0 1.2 1.1 No No 35.5772158° / -078.3656334° Creek 22 -L- 240+00 RT (3)Neuse 0.0 4.0 4.0 1.2 121 580 0.70% 4.2 1.5 5.4 1.6 No No 35.5667000° / -078.3394964° River 22 -L- 244+95 RT (3)Neuse 0.0 4.0 4.0 0.8 77 495 1.00% 2.5 1.5 3.2 1.6 No No 35.5658089° / -078.3382407° River 22 -L- 248+76 RT (3)Neuse 0.0 6.0 5.0 0.9 88 381 1.00% 2.9 1.5 3.7 1.5 No No 35.5651098° / -078.3372872° River 23 -L- 250+35 RT (3)Neuse 0.0 6.0 7.0 0.5 50 185 0.30% 35.5648390° /-078.3368628° River 1.5 0.8 2.0 0.8 No No 23 -L- 252+00 RT (3)Neuse 0.0 6.0 7.0 0.7 68 139 2.50% 2.0 1.8 2.6 2.0 No No 35.5645322° / -078.3364561 ° River 23 -L- 252+68 RT (3)Neuse 0.0 4.0 3.0 8.8 875 59 0.30% 26.4 1.8 34.1 2.7 No No 35.5643977° / -078.3362964° River 23 -SR7- 53+87 LT (3)Neuse 0.0 3.0 3.0 0.5 47 280 4.01 % 1.2 2.2 1.5 2.4 No Yes 35.5637636° / -078.3342395° River 25 -SR7- 72+48 RT (3)Neuse 0.0 4.0 3.0 0.3 26 212 2.84% 0.6 1.6 0.8 1.7 No No 35.5604700° / -078.3294491 ° River 25 -L- 252+68 RT (3)Neuse 0.0 4.0 3.0 4.3 434 340 0.48% 13.8 1.8 17.8 1.9 No No 35.5643977° / -078.3362964° River 24 -SR7- 55+12 LT (3)Neuse 0.0 3.0 3.0 26.0 2600 1000 2.35% 22.0 3.7 29.0 4.0 No Yes 35.5635658° / -078.3338927° River 23 -SR6- 48+81 RT (3)Neuse 0.0 4.0 3.0 5.3 530 406 2.20% 19.0 3.6 25.0 3.8 No Yes 35.5632513° / -078.3353577° River Additional Comments The swale on Plan Sheet 23 at Sta. 48+81 -SR6- receives drainage from 5.3 acres. The swale has to outlet into the inlet of a 30" pipe. There is not enough length available from where the swale must begin to where it ends to meet the necessary length requirement. The swale on Plan Sheet 24 at Sta. 55+12 -SR7- receives drainage from 26 acres. There is not enough length available prior to the outlet into a 54" pipe to fully meet the length requirement. The velocity of 3.7 fps is on a 150 feet section of the ditch that is at 2.35% grade. Treatment will be provided by the remaining 850 feet that meets the swale criteria.