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DateDrawnCheckedCheckedDrawnDesignedRevisionNo.0 1"2"3"888-224-5942PRINTED:NOT FOR CONSTRUCTIONUPSTREAM FISH PASSAGEATTRACTION FLOW CHANNEL SECTIONBLEWETT FALLS DEVELOPMENTCONCEPTUAL UPSTREAM FISH PASSAGE405-023RMDAJCJEWSCALE IN FEET808166-5-1812-7-17RMDCONCEPTUAL DESIGN SUBMITTALJEW6-5-18RMDREVISED CONCEPTUAL DESIGNJEW PRINTED:DUKE ENERGY CAROLINAS, LLCCHARLOTTE, NCSK7UPSTREAM FISH PASSAGEATTRACTION FLOW PIPE SECTION8SCALE IN FEET8016C1"= 8'SECTIONSK2BLEWETT FALLS DEVELOPMENTCONCEPTUAL UPSTREAM FISH PASSAGE405-023RMDAJCJEW© Project No.Date RevisedJ:\405\023\Drawings\Working Drawings\Conceptual drawings\ALTERNATE CONCEPTUAL CAD FILES\405-023-SK7 and 8.dwg DrawingNo.KleinschmidtGroup.comJun. 5, 2018 - 11:29 AM 22x34 = FULL SCALE DateDrawnCheckedCheckedDrawnDesignedRevisionNo.0 1"2"3"888-224-59426-5-1812-7-17RMDCONCEPTUAL DESIGN SUBMITTALJEW6-5-18RMDREVISED CONCEPTUAL DESIGNJEW PRINTED:DUKE ENERGY CAROLINAS, LLCCHARLOTTE, NCSK8UPSTREAM FISH PASSAGEATTRACTION FLOW PIPE VIEW8SCALE IN FEET80161"= 8'VIEWD-DSK2BLEWETT FALLS DEVELOPMENTCONCEPTUAL UPSTREAM FISH PASSAGE405-023RMDAJCJEW© Project No.Date RevisedJ:\405\023\Drawings\Working Drawings\Conceptual drawings\ALTERNATE CONCEPTUAL CAD FILES\405-023-SK7 and 8.dwg DrawingNo.KleinschmidtGroup.comJun. 5, 2018 - 4:44 PM 22x34 = FULL SCALE DateDrawnCheckedCheckedDrawnDesignedRevisionNo.0 1"2"3"888-224-59426-5-1812-7-17RMDCONCEPTUAL DESIGN SUBMITTALJEW6-5-18RMDREVISED CONCEPTUAL DESIGNJEW Feet0300600 400 Ill ...J LL -I=- [( ...J en ~ -. <") w j:: LU 111 ...J .,.... rn u, o-A 111 r n :J ~ -~ ~ I -n <") 0 ...J ~ ::::::: .,.... -~ N ....... 1:-7 <") .... -LO --' I ~ ~ .,.... ~ ,,; w 111 -(! ~~ ~ ...J -... l r ~Q-, ~ 0 00 .;....ca ~ ~ ·-....... I ~ 1-~;;;;;-~~ro 300 . -~z ION- a.. 0 D; ~~ en a.. ~ (.!) a.. u~ +'~ a_ "I~ 1 -< ... .,.... • ..._"--Q L.. ::. .,.... I ~ LI ~ "f' L.. ~ ~ .. -ca I-9 ~ 111 CX) w I-~-" :::> < :::> <i: ro ~ ::::> II -I ~ :1 ;(( ~ :::> c ( fg ·-,,.. . '·"' ~- <( If) ·-a en a Cn~ -(~ ldi ~ Ui • r I {5( o c-:.i (.!) I ) en C"': ~ ~ uPGW-@oU .... ~ "'-.. \ CHGW@60° F \ / r--.... ..._198.63 \ ~ v ~ -~ ~ 5.45 --c PNDUC1 "OR~Q no c :::-... -·~ .,~ ~ F \ 59 18.06 ~ ~ ~/ V: f""--........;:::__-...... ;I~ CON DUCTOF ~ @212° -:::::::::-~ ... rrn LL~ ~" ~ _\..--: i:;;:.--~ ~ V· 0 ~-l:j --£-n 256.1• -:::::----\ ---~-a:> ll) <=> <~ ~ ~ ~ ~ tt::-~ '+ ~ I--~"\ '"'" ---.:: a:> i:e 200 ;: !::: 9 --± ~ ~~ I ~ -.....,,._ -,.---.,. ---=----..... ~ T"' 1 3:~ a:i Cl) ""' ..... ~ ..... ...,: IJ. I ill ---~ 'f I-' j::: ...J LL .... 62.9' Cl) III ..... cc Cl) ) \ <O <i: /N ~ ll) ~ + ~6.4' I::: b \ N ciEN IEtEv. .I\ I w> I ~·· o - :> II ~3.1 GE 0 b -~ U.S. 74 BRIO ;-p .... ""---Cl) IS ~ I tlt.v. 1titi.4U' __/ "If' 0 a:> a: • I ·""-36.7' /!"' a.. (D ~ ~ ~ \ / ... CJ) a> nl-IWM :J29 .. 6~ ll) ll) • ~rn _/ (") co 0 .... -i.:-8~ .4' 411.3' 10~.4' a.. I l)"DA~I I 100 I p EDEE RIVE ~NEL DIS HARGECHI 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 + + + + + + + + + + + 0 ..... N (") "If' ll) <O ..... co a> 0 .... BRIDGE CROSSING U.S. 74 DOWNSTREAM I --I ' . IS LOCATED APPROX. 2.65 MILES SOUTH l -I I . AND EAST WITH A BOTTOM OF BRIDGE I I ~~U TAP STR. 3 - p\ 8+54.17 . . OR BENT ELEV. OF 166.40 FEET. I PEE DEE RIVER I 103°59'5211 OHWM ELEV. = 129.66 AT BRIDGE . DISCHARGE CHANNEL . I I . \ \ ., 5\R '\ 5\l \ ~f' BLEWETI G Q..\-00 .00 SWITCHYARD f'\ •QO" FALLS ooOO NOTE: -ORDINARY HIGH WATER MARK <OHWM> IS 129.66' VICINITY MAP NOT TO SCALE OVERHEAD WIRE CROSSING BLEWETT H.E. PLANT ~ . . . I I . I 10+00 .-r--I BLEWE~~CLLS PLANT I GSU TAP STR5 Pl 11+28.25 0°00 100 11 \ GSU TAP STR4 . .,.,,\ Pl 10+52.80 \ . -84 ° 4013211 \ . \ . I \ . \ ' I -\ . PURPOSE TO TRANSMIT ELECTRIC POWER AT 115,000 VOL TS FROM BLEWETT H.E. SWITCHYARD TO GSU BLEWETT FALLS H.E. PLANT SWITCHYARD 115KV TIE LINE CROSSING TAIL WATER AT BLEWETT H.E. PLANT LOCATION ANSON COUNTY N.C. HORZ. 111 =200 1 Scale VERT. 111 =40 1 Date 7-25-18 Drawn By~_E_L_T~ A roved B JG Checked Ow . No. By JG CT-74631 0 N ';;)' co ~ :c Ii:: 0 z c a:: (.!) <.) :i VEGETATION LINE STA: 6+37.20 ELEV.: 124.30' TOP OF BRIDGE DECK ELEV: 171.15' oi PROFILE SCALE: VERTICAL: 1"=40' HORIZONTAL: 1"=400' N G" --0:: -__ ELEV . ....117.20'_ ~ ~ t..J. --ct: g t::l~ ~ o~ =-=-t..J +=-=-=-=-=-=-:..:=::---=:-: OHWM '-.ffi ~~ WATER LEVEL AT ELEV.:124.30' t..1""'--1.J...~..r---TIME OF SURVEY o Ul ELEV.: 122.40' APPROX. RIVER BOTIOM NOT TO SCALE DATUM DESCRIPTION (:7l THE COORDINATE SYSTEM DEVELOPED FOR THIS PROJECT IS BASED ON THE STATE PLANE COORDINATES ESTABLISHED BY VRS-RTK GPS METHOD UTILIZING TRIMBLE R10 UNIT AND CONVENTIONAL TRAVERSE FROM GPS CONTROL POINTS. PROJECT COORDINATES ARE BASED ON NGS PEEDEE RESET NAD 83(2011) STA TE PLANE GRID COORDINATES OF NORTHING: 440,298.95 (FT) EASTING: 1, 743, 783.20 (FT) ELEV. 405.00 (FT) (NA VD 88) COMBINED GRID FACTOR (CGF): 0.99987128 INVERTED: 1.00012873 NOTE: • GROUND LiDAR ELEVATION DATA OBTAINED FROM NCFLOODMAPS.COM AND QL2 SPATIAL DATA DOWNLOAD JUNE 28TH, 2018 • ALL DISTANCES ARE HORIZONTAL GRID • COORDINATES SHOWN ARE NC GRID NAD 83(2011) SEE DATUM DESCRIPTION • CROSSING MAP PREPARED FOR: DUKE ENERGY PROGRESS, LLC • SUBJECT PROPERTY IS LOCATED WITHIN "ZONE AE" AREAS AS SHOWN ON FEMA FIRM MAP NUMBER 3710742200K, EFFECTIVE DATE AUGUST 19, 2008 • FLOOD LINES AND DATA AS SHOWN PER SHAPE FILES DOWNLOADED FROM NCFLOODMAPS.COM CERTIFICATE OF SURVEY I JOHN P. SCOVILLE, Ill, CERTIFY THAT UNDER MY DIRECTION AND SUPERVISION, THIS PLAN AND PROFILE WAS DRAWN IN PART FROM AN ACTUAL FIELD SURVEY AS WELL AS DATA SUPPLIED BY DUKE ENERGY, THAT THE RATIO OF PRECISION AS CALCULATED IS 1: 10,000+ AND THAT THIS PLAT WAS PREPARED IN ACCORDANCE WITH THE STANDARDS OF PRACTICE FOR LAND SURVEYING IN NORTH CA C 56.1600 SITE: 104523 DUKE ENERGY PROGRESS, LLC BLEWETI FALLS PLANT FISH LIFT REROUTE BLEWETI FALLS HYDRO PLANT US 74 BRIDGE CROSSING OVER THE PEE DEE RIVER LILESVILLE TOWNSHIP ANSON COUNTY, NC BOOK:GM02.819 200 O 200 400 600 CREW: CM/DT DATE:06/28/18 ---------· DRAWN BY:PB/AET SCALE: 1"= 400' SCALE IN FEET R.O.P .. = 1':10,000'+ LAND UNIT: MAP: 104523-003294 LEGEND LINES SURVEYED LINES NOT SURVEYED ----- TIE LINES ------------- FEMA REGULATORY FEMA ZONE ·o.2x· FEMA ZONE 'AE' R.O.P. RATIO OF PRECISION ~ NTS )----NOT TO SCALE o Pt POINT NOT SET EOI WBL EBL (F-100) MHW OHWM END OF INFORMATION WEST BOUND LANE EAST BOUND LANE 100 YEAR FLOOD ELEVATION MEAN HIGH WATER ORDINARY HIGH WATER MARK )ESP ESP ASSOCIATES, INC. 7011 ALBERT PIO< RO, SUITE E GREENSBORO, NC 27409 338-334-7724 FIRM I F-1407 ESPASSOCIA TES.COM e/_~DUKE ~ ENERGY. 550 S. TRYON STREET PO BOX 1007 CHARLOTIE N.C. 28201-1007 TELEPHONE NO. (704) 382-6658 PURPOSE TO TRANSMIT ELECTRIC POWER AT 115,000 VOLTS FROM BLEWETT HYDRO TO GSU NOTE: 250 200 -ORDINARY HIGH WATER MARK IS 129.2' -120 YEAR FLOOD ELEVATION INFORMATION IS NOT AVAILABLE Mesa Associates. LLC. Enalnema and Canmdtanta 832 Giorgia Awnue,, SUlte 300 ~TN~402 Tel. (423) 424-~ VICINITY MAP NOT TO SCALE 150 OH (/) o~ "O I a.. ...J -· l 10 I.LI ~o I :I: .... (/) 596.39' Blewett Hydro I PROGRESS ENERGY CAROLINAS, INC. RALEIGH,. N.C. BLEWETT HYDRO PLANT -GSU TIE LINE 115KV T.L. CROSSING TAIL WATER AT BLEWETT HYDRO PLANT LOCATION HORZ. 1"=400' Scale VERT. 1 "=40' Drawn By BD Approved By PAC ANSON COUNTY Date 1-21-06 Checked By JHA Dwg. No. TA-50583 DUKE ENERGY PROGRESS, LLCCHARLOTTE, NORTH CAROLINAJ:\405\024\Drawings\Working Drawings\CONCEPTUAL DRAWINGS\405-024-Cover.dwgAug. 11, 2017 - 4:25 PMPRINTED:BLEWETT FALLS DEVELOPMENTCONCEPTUAL DOWNSTREAM FISH PASSAGE8-11-17NOT FOR CONSTRUCTION 405-0247-17-17DUKE ENERGY PROGRESS, LLCCHARLOTTE, NORTH CAROLINASK18-11-17RMDPRELIMINARY LAYOUT-© Project No.Date RevisedJ:\405\024\Drawings\Working Drawings\CONCEPTUAL DRAWINGS\405-024-SK1-SK3.dwg DrawingNo.KleinschmidtGroup.comAug. 11, 2017 - 2:04 PM 22x34 = FULL SCALE DateDrawnCheckedCheckedDrawnDesignedRevisionNo.0 1"2"3"888-224-5942JEWRMDKAMJEWPRINTED:NOT FOR CONSTRUCTIONBLEWETT FALLS DEVELOPMENTCONCEPTUAL DOWNSTREAM FISH PASSAGEEXISTING CONDITIONS OVERALL SITE PLAN PLAN1:60ELEVATION LOOKING UPSTREAM1:60405-0247-18-17DUKE ENERGY PROGRESS, LLCCHARLOTTE, NORTH CAROLINASK2© Project No.Date RevisedJ:\405\024\Drawings\Working Drawings\CONCEPTUAL DRAWINGS\405-024-SK1-SK3.dwg DrawingNo.KleinschmidtGroup.comAug. 11, 2017 - 10:08 AM 22x34 = FULL SCALE DateDrawnCheckedCheckedDrawnDesignedRevisionNo.0 1"2"3"888-224-5942RMDKAMJEWPRINTED:NOT FOR CONSTRUCTIONBLEWETT FALLS DEVELOPMENTCONCEPTUAL DOWNSTREAM FISH PASSAGEEXISTING CONDITIONSSPILLWAY PLAN AND ELEVATIONSCALE IN INCHES50510-8-11-17RMDPRELIMINARY DRAWING-JEWCSK3BASK3SK3 A3/8"= 1'-0"SECTIONSK2B3/8"= 1'-0"SECTIONC3/8"= 1'-0"SECTIONSK2SK2405-0247-18-17DUKE ENERGY PROGRESS, LLCCHARLOTTE, NORTH CAROLINASK3-© Project No.Date RevisedJ:\405\024\Drawings\Working Drawings\CONCEPTUAL DRAWINGS\405-024-SK1-SK3.dwg DrawingNo.KleinschmidtGroup.comAug. 11, 2017 - 4:34 PM 22x34 = FULL SCALE DateDrawnCheckedCheckedDrawnDesignedRevisionNo.0 1"2"3"888-224-5942RMDKAMJEWPRINTED:NOT FOR CONSTRUCTIONBLEWETT FALLS DEVELOPMENTCONCEPTUAL DOWNSTREAM FISH PASSAGEEXISTING CONDITIONSSPILLWAY SECTIONS8-11-17RMDPRELIMINARY DRAWING-JEWSCALE IN INCHES50510 BSK6OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3OBERMEYER HYDRO, INC.F400-45 R3A-ASK5405-0247-17-17DUKE ENERGY PROGRESS, LLCCHARLOTTE, NORTH CAROLINASK48-11-17RMDPRELIMINARY LAYOUT-© Project No.Date RevisedJ:\405\024\Drawings\Working Drawings\CONCEPTUAL DRAWINGS\405-024-SK4-SK6.dwg DrawingNo.KleinschmidtGroup.comAug. 11, 2017 - 4:41 PM 22x34 = FULL SCALE DateDrawnCheckedCheckedDrawnDesignedRevisionNo.0 1"2"3"888-224-5942JEWRMDKAMJEWPRINTED:5SCALE IN FEET5010NOT FOR CONSTRUCTIONBLEWETT FALLS DEVELOPMENTCONCEPTUAL DOWNSTREAM FISH PASSAGEPROPOSED DOWNSTREAMFISH PASSAGE PLANKEY PLANDOWNSTREAM FISH PASSAGEGATE OPERATION TABLEDISCHARGE VALUE (CFS)HEADPONDELEVATIONDEPTH OF FLOW THRUGATEPANEL1PANEL2PANELS1 & 2PANELS1, 2, & 3178.18.0465177.67.5428177.17.0392176.66.5356176.16.0320175.65.5285175.55.4280448175.15.0398174.64.5343174.14.0290174.03.9280478173.63.5406173.13.0324172.82.7280443172.62.5390172.12.0280 405-0247-18-17DUKE ENERGY PROGRESS, LLCCHARLOTTE, NORTH CAROLINASK5© Project No.Date RevisedJ:\405\024\Drawings\Working Drawings\CONCEPTUAL DRAWINGS\405-024-SK4-SK6.dwg DrawingNo.KleinschmidtGroup.comAug. 11, 2017 - 4:45 PM 22x34 = FULL SCALE DateDrawnCheckedCheckedDrawnDesignedRevisionNo.0 1"2"3"888-224-5942RMDKAMJEWPRINTED:NOT FOR CONSTRUCTIONBLEWETT FALLS DEVELOPMENTCONCEPTUAL DOWNSTREAM FISH PASSAGEPROPOSED DOWNSTREAM FISH PASSAGE ELEVATION LOOKING UPSTREAM1"=5'-0"VIEWA-ASK4SCALE IN INCHES50510-8-11-17RMDPRELIMINARY DRAWING-JEW B1"=5'-0"PROPOSED SECTIONSK4B1"=5'-0"DEMO SECTIONSK4405-0247-18-17DUKE ENERGY PROGRESS, LLCCHARLOTTE, NORTH CAROLINASK6-© Project No.Date RevisedJ:\405\024\Drawings\Working Drawings\CONCEPTUAL DRAWINGS\405-024-SK4-SK6.dwg DrawingNo.KleinschmidtGroup.comAug. 11, 2017 - 4:48 PM 22x34 = FULL SCALE DateDrawnCheckedCheckedDrawnDesignedRevisionNo.0 1"2"3"888-224-5942RMDKAMJEWPRINTED:NOT FOR CONSTRUCTIONBLEWETT FALLS DEVELOPMENTCONCEPTUAL DOWNSTREAM FISH PASSAGEPROPOSED DOWNSTREAM FISH PASSAGESECTIONS8-11-17RMDPRELIMINARY DRAWING-JEWSCALE IN INCHES50510 F/SER31:FI SERO-2018-00255, SER-2018-19586 David L. Shaeffer, Project Manager Charlotte Regulatory Office Wilmington District Corps of Engineers Department of the Army 151 Patton Avenue, Suite 208, Asheville, North Carolina 28801 Dear Mr. Shaeffer: This letter responds to your request for consultation with us, the National Marine Fisheries Service (NMFS), pursuant to Section 7 of the Endangered Species Act (ESA) for the following action. Permit Number Applicant SER Number Project Type SAW-2018-00568 Duke Energy Progress, LLC SERO-2018-00255; SER-2018-19586 Construction of a cofferdam to install a fish passage device Consultation History NMFS’s Revised Biological Opinion (Opinion) for the Yadkin-Pee Dee Hydroelectric Project (YPDHP) issued on April 17, 2015,1 required the installation of a fish passage device for the upstream passage of American Shad. The Opinion for YPDHP covered the construction of the fish passage but did not consider installation of a cofferdam and related effects to species and related critical habitat. We received your letter requesting consultation for the installation of the cofferdam on September 19, 2018. Due to recent findings to ESA-listed sturgeon species and required work windows, we requested additional information regarding the proposed action’s construction conditions on November 8 and December 17, 2018. We received a final response on December 19, 2018, and initiated consultation that day. Consultation was held in abeyance for 38 days due to a lapse in appropriations and resulting partial government shutdown. Consultation resumed on January 28, 2019. This project was originally assigned a tracking number (SER-2018-19586) in our now obsolete tracking system. The project has been assigned a tracking number in our new NMFS Environmental Consultation Organizer (ECO), SERO-2018-00255. Please refer to this number in any future inquiries regarding this project. 1 NMFS. 2015. Revised Final Biological Opinion for the Yadkin-Pee Dee Hydroelectric Project (FERC Project No. 2206- 030). National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southeast Regional Office, Protected Resources Division, Saint Petersburg, Florida. 2 Project Location Address Latitude/Longitude Water body 2593 Power Plant Road, Lilesville, Anson County, North Carolina 34.98280278ºN, -79.8769444 ºW (North American Datum 1983) Pee Dee River Image of the project location and surrounding area (©2018 Google) Existing Site Conditions The project is located on the Pee Dee River at the Blewett Falls Dam and Hydroelectric Station in Lilesville, Anson County, North Carolina, at approximately river mile 188.2 from the nearest opening to the Atlantic Ocean at Winyah Bay. The site includes the Blewett Falls Lake Dam, retaining wall, and concrete tailrace. According to United States Army Corps of Engineers (USACE), dominant substrate within the project include scoured bedrock, intermittent boulders and large cobble. Water quality is typically good and consistently meets North Carolina water quality standards for dissolved oxygen. Water depth in the project area ranges from approximately 4 to 18 feet (ft), with an average depth estimated at 10 ft. Blewett Falls Hydroelectric Powerhouse Proposed Fish Passageway Site Anson/Richmond County Line 3 Blewett Falls Dam represents the Pee Dee River system’s upstream extent of sturgeon spawning and summer/winter seasonal habitat. The fall line (the boundary between an upland region of continental bedrock and an alluvial coastal plain, sometimes characterized by waterfalls or rapids) is located approximately 22 river miles below Blewett Falls Dam. Project Description The applicant proposes to install a cofferdam around the upstream fish passage facilities required by the YPDHP for American shad. All construction activities of the fish passage facility will be conducted once the installation of the cofferdam is complete and the area dewatered. The dewatered area of the cofferdam will be approximately 2,900 square feet (ft2) (0.07 acres [ac]). Data obtained from 3 geotechnical borings will be used to determine the final design of the cofferdam that will be used to dewater the work area for installation of the fish passage facility. The borings will be performed using an ATV/track-mounted drill rig atop a spud barge deployed in the tailrace. The 4-in-diameter borings will be extended to depths ranging from 25 to 45 ft below the river bottom. Upon completion of the project, the borings will be backfilled “from the bottom up” with cement grout placed via a tremie pipe. The cofferdam is expected to be constructed of braced sheet pile. The approximate total length of sheet pile cofferdam is 245 ft. It is anticipated that approximately 105 PZ 35 (or similar) type sheet piles (approximately 28-in-wide) will be used for the cofferdam. The sheet piles will be installed using a vibratory hammer deployed via a land-based crane with a clamshell bucket. A bubble curtain system will be deployed around active pile driving to attenuate noise from pile driving. Equipment mounted on the spud barge in the tailrace will guide the placement of the sheet piles. The interior side of the sheet pile wall will be braced with steel framework as needed depending on the embedment depth achieved by the piles. Depending on the embedment depth of the piles, a tremie concrete seal 2 may need to be placed along the exterior perimeter of the sheet pile wall. Once the sheet pile cofferdam is installed and dewatered, the concrete retaining wall that forms the shoreline of the tailrace and is inside the cofferdam will be demolished and removed from the site. When the construction of the new fish passage facility is complete, the cofferdam will be removed the same way it was installed. Pile Installation Pile type Number of Piles Installation Method Confined Space or Open Water Metal (PZ35) 28-in-wide 105 Vibratory hammer using bubble curtains Open water Construction Conditions No in-water work in the river on the downstream side of Blewett Falls Dam and within 500 yards (yd) of the dam or power station may occur from February 1 to April 30 or September 15 to October 15 of any year. This does not apply to emergency work (i.e., work that cannot wait until after the time restriction). The cofferdam will be installed and boring activities conducted during the period when in-water work is allowable per the terms of the YPDHP Opinion and periods allowable under the terms of the 404 Permit. This would include periods of the in-water work prohibition periods specified in the Opinion and described above. The cofferdam will remain in place for the duration of 2 A tremie is used to pour concrete underwater in a way that avoids washout of cement from the mix due to turbulent water contact with the concrete while it is flowing. This produces a more reliable strength of the product. 4 construction, which is expected to take up to one year. Tailrace borings will occur once the 404 Permit is received. NMFS’s Revised Opinion covers the fish passage construction and operation, and Reasonable and Prudent Measure (RPMs) are contained in the BiOp with implementing Terms and Conditions (T&Cs). Therefore, the applicant will implement these protective measures as required by RPM#1 and T&C#1 to protect sturgeon during fish passage construction activities. RPM #1 and T&C#1 specify that all potential adverse impacts to sturgeon during the construction and operations of the TST fish passage facility (a trap, sort and truck facility in the Blewett Falls tailrace, which would be used to collect anadromous species [primarily American shad] so that they could be sorted and then transported, via truck, to areas upstream of Blewett Falls) or during other construction activities or maintenance of the Blewett Falls Dam are to be minimized to the greatest extent practicable. The applicant has agreed to adhere to NMFS's Sea Turtle and Smalltooth Sawfish Construction Conditions.3 If a sturgeon is seen within 100 yd of the active daily construction/maintenance operation, all appropriate precautions shall be implemented to ensure its protection. Operation of any moving mechanical construction equipment shall cease immediately if a sturgeon is seen within a 50- ft radius of the equipment. Activities may not resume until the protected species has departed the project area of its own volition. Additionally, turbidity curtains will be used for all in-water work. Appropriate erosion and turbidity controls (e.g. cofferdam) shall be utilized during any in-water work carried out by the applicant to limit contaminant-laden sediments from entering the water. No construction debris shall be allowed to enter the water. Effects Determinations for Species the Action Agency or NMFS Believes May Be Affected by the Proposed Action Species ESA Listing Status Action Agency Effect Determination NMFS Effect Determination Fish Shortnose sturgeon E NLAA NLAA Atlantic sturgeon (Carolina DPS) E NLAA NLAA E = endangered; T = threatened; NLAA = may affect, not likely to adversely affect Critical Habitat The project is located in Atlantic sturgeon critical habitat Carolina Unit 5 (Pee Dee Unit). Based on the project’s location within the river system, approximately 188 river miles upstream from the mouth of the Pee Dee River, we believe adults, subadults, juveniles, and larval sturgeon may be present in the vicinity of the proposed action. The Physical and Biological Features (PBFs) of the critical habitat are described in the table below. We believe the proposed action may affect PBF 1, hard substrate; PBF 3, unobstructed water of appropriate depth; and PBF 4, water quality. The project is located in freshwater habitat; therefore, PBF 2 is not present within the action area. 3 NMFS. 2006. Sea Turtle and Smalltooth Sawfish Construction Conditions revised March 23, 2006. National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Southeast Regional Office, Protected Resources Division, Saint Petersburg, Florida. http://sero.nmfs.noaa.gov/protected_resources/section_7/guidance_docs/documents/sea_turtle_and_smalltooth_sawf ish_construction_conditions_3-23-06.pdf. 5 Atlantic Sturgeon Critical Habitat PBFs PBF Identification Features Purpose/Function of PBF Hard Substrate (PBF 1) Hard bottom substrate (e.g., rock, cobble, gravel, limestone, boulder, etc.) in low salinity waters (i.e., 0.0-0.5 ppt [parts per thousand] range) Necessary for the settlement of fertilized eggs and refuge, growth, and development of early life stages Salinity Gradient and Soft Substrate (PBF 2) Aquatic habitat inclusive of waters with a gradual downstream gradient of 0.5 up to as high as 30 ppt and soft substrate (e.g., sand, mud) between the river mouth and spawning sites Necessary for juvenile foraging and physiological development Unobstructed Water of Appropriate Depth (PBF 3) Water of appropriate depth and absent physical barriers to passage (e.g., locks, dams, thermal plumes, turbidity, sound, reservoirs, gear, etc.) between the river mouth and spawning sites Necessary to support: • Unimpeded movement of adults to and from spawning sites; • Seasonal and physiologically dependent movement of juvenile Atlantic sturgeon to appropriate salinity zones within the river estuary; and • Staging, resting, or holding of subadults or spawning condition adults. Water depths in main river channels must also be deep enough (at least 1.2 meters [m]) to ensure continuous flow in the main channel at all times when any sturgeon life stage would be in the river Water Quality (PBF 4) Water quality conditions, especially in the bottom meter of the water column, with appropriate temperature and oxygen values Necessary to support: • Spawning; • Annual and inter-annual adult, subadult, larval, and juvenile survival; and • Larval, juvenile, and subadult growth, development, and recruitment. Appropriate temperature and oxygen values will vary interdependently, and depending on salinity in a particular habitat. Analysis of Potential Routes of Effects to Species Effects to Atlantic and shortnose sturgeon may include the risk of injury or death from interactions with construction activities and/or equipment; however, we believe this scenario is discountable due to the species’ mobility. The applicant’s implementation of NMFS’s Sea Turtle and Smalltooth Sawfish Construction Conditions will further reduce the risk of interactions by requiring all construction workers to watch for sturgeon. Operation of all mechanical construction equipment will 6 cease immediately if a sturgeon is seen within a 50-ft radius of the equipment. Activities will not resume until the protected species has departed the project area of its own volition. Use of turbidity curtains, the construction activities, and related construction noise may prevent or deter sturgeon from entering the project area. We believe that the effect to sturgeon from temporary exclusion from the project area due to construction activities, including related noise and presence of turbidity curtains, will be insignificant. The size of the area from which sturgon will be excluded is relatively small in comparison to the available river habitat, which sturgeon will be able to use during construction. After project completion, turbidity curtains will be removed and sturgeon will be able to return to the project area. Sturgeon could be affected by the placement of temporary in-water structures (e.g., cofferdams) in areas that may serve as spawning habitat. We believe the effect to sturgeon from the placement of temporary in-water structures will be insignificant. The area of temporary impact is relatively small (2,900 ft2 [0.07 ac]) compared to the surrounding area available that will serve as spawning habitat for the sturgeon. Further, once the temporary structure is removed, sturgeon can use the area for spawning again. Sturgeon may be affected by the permanent loss of habitat due to the placement of pile-supported structures. However, the effect to sturgeon from the potential loss of spawning habitat due to the placement of pile-supported structures is insignificant. Sturgeon are a mobile species that spawn over large areas and the area of impact is relatively small (420 ft2 [0.001 ac]) compared to the surrounding river habitat available. Effects to listed species as a result of noise created by construction activities can physically injure animals or change animal behavior in the affected areas. Injurious effects can occur in two ways. First, immediate adverse effects can occur to listed species if a single noise event exceeds the threshold for direct physical injury. Second, effects can result from prolonged exposure to noise levels that exceed the daily cumulative exposure threshold for the animals, and these can constitute adverse effects if animals are exposed to the noise levels for sufficient periods. Behavioral effects can be adverse if such effects interfere with animals migrating, feeding, resting, or reproducing, for example. Our evaluation of effects to listed species as a result of noise created by construction activities is based on the analysis prepared in support of the Opinion for SAJ-82.3 The noise analysis in this consultation evaluates effects to ESA-listed fish species identified by NMFS as potentially affected in the table above. The current NMFS-accepted noise thresholds to ESA-listed fish species due to vibratory hammer driving are 206 decibels (dB) for peak-pressure injury, 234 dB for cumulative sound exposure level (cSEL) injury, 150 dB root mean square (RMS) for behavioral disturbance of fishes over 102 grams (g) in weight. We do not expect fish under 102 g in weight to be present because the location is approximately 188 river miles from the mouth of the river and sufficiently far from the upstream spawning locations (pers. comm., A. Herndon and F. Innocenti on 12/20/2018). The applicant will install all piles using a vibratory hammer to drive 28-in-wide steel sheet piles to depth. Additionally, our calculation is based on 1 sheet pile installed at the maximum allowance of vibration time in a 12- hour period (i.e., number of seconds [sec] of vibration per pile x number of piles per day = estimated 3 NMFS. Biological Opinion on Regional General Permit SAJ-82 (SAJ-2007-01590), Florida Keys, Monroe County, Florida. June 10, 2014. 7 number of sec per day [43,200 = 60 sec x 60 minutes x 12 hours]) all construction activities will occur during daylight hours only. To minimize potential noise impacts, the applicant will use air bubble curtains to reduce noise levels. According to the best available data,4 air bubble curtains provide a 5 dB reduction in vibratory hammer underwater sound levels to piles up to 24 in wide.4 Based on our noise calculations, installation of 28-in steel sheet piles by vibratory hammer using air bubble curtains for noise abatement will not cause single-strike or peak-pressure injury to ESA-listed fish species. The cSEL of multiple sheet piles over the course of a 24 hour period may cause injury to ESA-listed fishes radius of up to 0.47 ft (0.14 m). Due to the mobility of ESA-listed fish species, we expect them to move away from noise disturbances. Because we anticipate the animal will move away, we believe that an animal’s suffering physical injury from noise is extremely unlikely to occur. Even in the unlikely event an animal does not vacate the daily cumulative injurious impact zone, the radius if that area is smaller than the 50-ft radius that will be visually monitored for sturgeon. Construction personnel will cease construction activities if animal sturgeon is sighted per NMFS’s Sea Turtle and Smalltooth Sawfish Construction Conditions. Thus, we believe the likelihood of any injurious cSEL effects is discountable. An animal’s movement away from the injurious impact zone is a behavioral response, with the same effects discussed below. Based on our noise calculations, installation of 24-in sheet piles by vibratory hammer using air bubble curtains as noise abatement could result in behavioral effects at radii of up to 152 ft (46 m) for ESA-listed fishes. Given the mobility of sturgeon, we expect them to move away from noise disturbances. Because there is similar river habitat nearby, we believe this effect will be insignificant. Since installation will occur only during the day, these species will be able to resume normal activities during quiet periods between pile installations and at night. Additionally, based on the configuration of the project area, sturgeon will be able to depart the affected area through several pathways; no access route will be blocked. Therefore, we anticipate any potential behavioral effects will be insignificant. Analysis of Potential Routes of Effect to Critical Habitat Hard substrate necessary for the settlement of fertilized eggs and refuge, growth, and development of early life stages (PBF 1) may be affected by the installation of piles. However, we believe this effect will be insignificant. The river contains gravel and cobble that may serve as a critical function for egg, larvae, and adult sturgeon growth and spawning; however, the temporary cofferdam piles will only affect a small portion of the tailrace. The available substrate surrounding the permanent and temporary structures will continue to support these early life stages, and once the temporary structure is removed, these areas of hard substrate will become accessible again. According to the USACE, the applicant will not conduct any in-water work from February 1 to April 30 and from September 15 to October 15 of any year, to prevent any interruption of sturgeon spawning and migration. The unobstructed water of appropriate depth (PBF 3) may be affected by the proposed action; however, we believe the effect will be insignificant. For the life stages potentially using the action area, PBF 3 refers to water that is free from obstruction such that: spawning adults can make unencumbered movements to the spawning grounds; adults can access staging, resting, and holding habitats; and juveniles can make seasonal and physiologically-dependent movements to appropriate salinity zones within the river. It also refers to the requirement that the main channel to be deep enough to ensure that there is continuous flow when adults or juveniles are there. The project will 4 ICF Jones and Stokes and Illingworth and Rodkin, Inc. (2009) Technical guidance for assessment and mitigation of the hydroacoustic effects of pile driving on fish. Prepared for the California Department of Transportation. 8 not alter the depth of the main channel or water flow in the channel. The installation of turbidity curtains, air bubble curtains, and a temporary cofferdam will only affect a small portion of the tailrace. These structures will be removed following completion of the fish passage facility. Upon removal, these structures will no longer create an obstruction to sturgeon movement. The installation of the cofferdam may create noise that could deter the movement of sturgeon through the area. However, no in-water pile driving will be allowed from February 1 to April 30 and from September 15 to October 15 of any year, to prevent any disruption of adult sturgeon migration activities. Therefore, we believe any effects to PBF3 will be insignificant. Localized and temporary reductions in water quality (PBF 4) through increased turbidity may result from the temporary placement of the cofferdam. We believe the effect to PBF 4 from localized and temporary increased turbidity will be insignificant because turbidity curtains will be used to contain turbidity and we expect any small amount of turbidity that may escape to have an insignificant effect on the water quality conditions, especially in the bottom meter of the water column, with appropriate temperature and oxygen values. Conclusion Because all potential project effects to listed species and critical habitat were found to be discountable, insignificant, or beneficial, we conclude that the proposed action is not likely to adversely affect listed species and critical habitat under NMFS’s purview. This concludes your consultation responsibilities under the ESA for species under NMFS’s purview. Consultation must be reinitiated if a take occurs or new information reveals effects of the action not previously considered, or if the identified action is subsequently modified in a manner that causes an effect to the listed species or critical habitat in a manner or to an extent not previously considered, or if a new species is listed or critical habitat designated that may be affected by the identified action. NMFS’s findings on the project’s potential effects are based on the project description in this response. Any changes to the proposed action may negate the findings of this consultation and may require reinitiation of consultation with NMFS. We look forward to further cooperation with you on other projects to ensure the conservation of our threatened and endangered marine species and designated critical habitat. If you have any questions on this consultation, please contact Francesca Innocenti, Consultation Biologist, at (727) 209-5995, or by email at francesca.innocenti@noaa.gov. Sincerely, David Bernhart Assistant Regional Administrator for Protected Resources File: 1514-22.f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Information & Anaylsis SCALE: DATE: PROJECT NUMBER FIGURE NO.3 1 " = 400 ' 8-3-2018 7126-18-007Blewett Falls Hydroelectric Station JD Reques - Revised After July 11, 2018 Site VisittDuke Energy Lilesville, Anson County, North Carolina Drawing Path: D:\GIS Projects\Temp Projects\7126-18-007 Blewett Falls Dredging PCN\Figures\Revised JD\Exhibit 3 E&SC Disposal Aerial.mxd plotted by RWalker 08-06-2018Aerial Imagery³THIS EXHIBIT WAS DEVELOPED USING INFORMATION AND DATA FROMTHE FOLLOWING SOURCES: - IMAGERY NC ONEMAP ORTHOIMAGERY - 2017 PLEASE NOTE THIS EXHIBIT IS FOR INFORMATIONAL PURPOSES ONLY.IT IS NOT MEANT FOR DESIGN, LEGAL, OR ANY OTHER USES. THEREARE NO GUARANTEES REGARDING ACCURACY. S&ME, INC. ASSUMESNO RESPONSIBILITY FOR ANY DECISION MADE OR ANY ACTIONS TAKEN BYTHE USER BASED UPON THIS EXHIBIT REFERENCE: Legend Review Area - 50 Acres Limits of Disturbance / Dredge Disposal Jurisdictional Stream - Approximatelty 360 Linear Feet Pee Dee River - Approximately 3.2 Acres Blewett Falls Lake - Approximately 9.6 Acres #*Site Coordinates X Stream Forms #Upland Data Point Review Area Coordinates34.982863 -79.87775 850 0 850425 Feet Upland Data PointCoordinates34.977376 -79.878626 Stream Form 1 Stream Form 3Stream Form 2 Above Ground PipingFor Dredged Materials