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Home My WebLink About20160742 Ver 6_CedarCliff_404_401Modification#5Request_20230306_20230306March 6, 2023 Mr. Brooke Davis U.S. Army Corps of Engineers 151 Patton Avenue, Room 208 Asheville, NC 28801-5006 Ms. Sue Homewood N.C. Division of Water Resources 450 W. Hanes Mill Rd, Suite 300 Winston-Salem, NC 27105 Via Email: brooke.a.davis(cbusace.arm y.mil Via Email: Sue. Homewood(@ncdenr.gov Subject: Cedar Cliff Auxiliary Spillway Upgrade Project Clean Water Act Section 404/401 Individual Permit Modification Request Dear Ms. Davis and Ms. Homewood: HDR, on behalf of Duke Energy Carolinas, LLC (Duke Energy), is requesting a modification to the approved Clean Water Act (CWA) Section 404 (Action ID 20215-02542) and Section 401 Individual Permit (DWR # 20160742 Ver 4) for design changes related to the Cedar Cliff Auxiliary Spillway Upgrade Project (Project) located in Jackson County, North Carolina. Original Section 404/401 Approval (March 22, 2017) —A Pre -Construction Notification was submitted to authorize 110 linear feet of temporary stream impacts associated with temporary stream crossings, 0.05 acres of temporary open water impacts associated with barge loading/staging area, 9.6 acres of permanent open water impacts associated with disposal of rock spoil, 50.8 acres of temporary open water impacts associated with dewatering the reservoir, 0.01 acres of permanent open water impacts associated with construction of a submerged weir/rock vane, and 0.22 acres of permanent open water impacts associated with construction of a haul/access road. Modification #1 Request (June 21, 2019) — A permit modification request was submitted for (1) approval of the water quality monitoring plan, (2) revision of 404 Special Condition 20.0 regarding required turbidity curtain barriers, and (3) authorization of additional fill impacts associated with improvements to the Cedar Cliff Lake access boat ramp and construction of a temporary barge access road. The additional impacts consisted of 1.4 acres of temporary impacts to open waters, 0.73 acres of permanent impacts to open waters, and 45 linear feet of temporary impacts to streams. • Modification #2 Request (October 29, 2020) — A permit modification request was submitted for additional impacts associated with further improvements to the Cedar Cliff Lake public access area including a temporary riprap apron and excavation of accumulated lake sediment. These impacts consisted of 0.017 acres of temporary impacts to open waters and 0.007 acres of permanent impacts to open waters. hdrinc.com 440 S. Church Street, Suite 1200; Charlotte, NC 28202 T 704.338.6700 F 704.338.6760 Cedar Cliff Auxiliary Spillway Upgrade Project March 6, 2023 Page 2 • Modification #3 Request (August 25, 2021) — Duke Energy requested approval of design changes related to the previously authorized 1951 Access Road and newly proposed weir and spoil repository footprint located within Cedar Cliff Lake. • Modification #4 Request (February 8, 2022) — Duke Energy requested authorization for additional impacts assocated with modification for spoils disposal areas within the bypass reach of the East Fork Tuckasegee River. These impacts consist of 597 linear feet of permanent stream impacts and 100 linear feet of temporary stream impacts to the East Fork Tuckasegee River. • Modification #5 (March 6, 2023) — Duke Energy is requesting authorization for additional permanent impacts below the normal pond elevation of Cedar Cliff Lake (2,330 feet mean sea level [ft msl]) related to (1) modifications of the revised Shook Cove Road Boat Ramp, and (2) riprap assocated with the barge loading area at the peninsula along the 1951 Access Road proposed to be left in place. Shook Cove Road Boat Ramp Duke Energy is proposing to extend the existing 16-foot-wide concrete boat ramp at the Cedar Cliff Lake Access Area by approximately 168 feet (0.06 acres) and to leave the remaining surge stone used for the temporary barge access road to serve as a permanent maintenance access during drawdowns. The proposed permanent maintenance ramp will be located entirely within the previously permitted 0.49-acre footprint of the temporary barge access road (OW6). Excavation will be required to connect the existing concrete boat ramp with the extended boat ramp and will be located with the previously authorized excavation impacts footprint (OW7). An approximately 260-foot-long by maximum 5-foot- high retaining wall is proposed to be installed between the permanent maintenance access and the rock ditch (OW8). The boat ramp modifications have been reviewed and approved by the N.C. Wildlife Resources Commission and Jackson County. Duke Energy is requesting that OW6 impacts be revised from temporary to permanent impacts to accommodate the permanent maintenance access (Figure 1 and Figure 2). 1951 Access Road The current permit authorized approximately 0.61 acres (OW5) of permanent impacts below the normal pond elevations associated with the 1951 Access Road. Duke Energy's construction contractor did not build out the 1951 Access Road in its entirety. Riprap was placed below the normal pond elevation at the apex of the peninsula to accommodate a barge loading area. Duke Energy is proposing to leave approximately 0.04 acres of permanent riprap below the normal pond elevation at this location, as it would cause more disturbance to the reservoir bottom to remove it. Figure 3 illustrates the as -built survey within the shortened 1951 Access Road and the location of riprap requested to remain in place (OW10) associated with the peninsula barge loading area. Table 1 details the timeline of approved Section 404/401 impacts as well as newly requested impacts associated with this Project. Cedar Cliff Auxiliary Spillway Upgrade Project March 6, 2023 Page 3 Table 1. Timeline of Requested and Approved Section 404/401 Impacts Type of Impact STREAMS Site 1 • Temporary Stream Crossing Original Amount of Approved Permanent Impacts Mar 2017 0 (If) Original Amount of Approved Temporary Impacts Mar 2017 110 (If) Modification #1 Amount of Approved Permanent Impacts June 2019 0 (If) Modification #1 Amount of Approved Temporary Impacts June 2019 110 (If) Modification #2 Amount of Approved Permanent Impacts Au 2020 0 (If) Modification #2 Amount of Approved Temporary Impacts Au 2020 110 (If) Modification #3 Permanent Impacts (Aug 2021) 0 (If) Modification #3 Temporary Impacts (Aug 2021) 110 (If) Modification #4 Permanent Impacts (Feb 2022) 0 (If) Modification #4 Temporary Impacts (Feb 2022) 110 (If) Modification #5 Permanent Impacts (requested Mar 2023) 0 (If) Modification #5 Temporary Impacts (requested Mar 2023) 110 (If) Site 2 - Kiesee Creek - - - 45 (If) - 45 (If) - 45 (If) - 45 (If) Site 3 - Slope Protection Fill (Bypass Reach) 578 (If) 578 (If) Site 4 - Lower Access Crossings (Bypass Reach) 70 (If) 70 (If) Site 5 - Installed Gabion Basket Walls (Bypass Reach) 20 (If) 20 (If) Site 6 - Proposed Gabion Basket Walls (Bypass Reach) 10 (If) 10 (If) Site 7 - Riprap (Bypass Reach) OPEN WATERS OW1 - Barge Staging Area 0 (ac) 0.05 (ac) 0 (ac) 0.05 (ac) 0 (ac) 0.05 (ac) 0 (ac) 0.05 (ac) 19 (If) 0 (ac) 0.05 (ac) 19 (If) 0 (ac) 0.05 (ac) OW2 - Rock Spoil Repository 9.6 (ac) 0 (ac) 9.6 (ac) 0 (ac) 9.6 (ac) 0 (ac) 8.75 (ac) 0 (ac) 8.75 (ac) 0 (ac) 8.75 (ac) 0 (ac) OW3 - Drawdown De -watering 0 (ac) 50.8 (ac) 0 (ac) 50.8 (ac) 0 (ac) 50.8 (ac) 0 (ac) 50.8 (ac) 0 (ac) 50.8 (ac) 0 (ac) 50.8 (ac) OW4 - Submerged Rock Weir 0.01 (ac) 0 (ac) 0.01 (ac) 0 (ac) 0.01 (ac) 0 (ac) 0.01 (ac) 0 (ac) 0.01 (ac) 0 (ac) 0.01 (ac) 0 (ac) OW5 - 1951 Access Road 0.22 (ac) 0 (ac) 0.22 (ac) 0 (ac) 0.22 (ac) 0 (ac) 0.61 (ac) 0 (ac) 0.61 (ac) 0 (ac) 0.61 (ac) 0 (ac) OW6 - Barge Access Road - 0 (ac) 0.49 (ac) 0 (ac) 0.49 (ac) 0 (ac) 0.49 (ac) 0 (ac) 0.49 (ac) 0.49 (ac) 0 (ac) 0W7 - Excavation 0 (ac) 0.49 (ac) 0 (ac) 0.63 (ac) 0 (ac) 0.63 (ac) 0.63 (ac) 0 (ac) 0.63 (ac) 0 (ac) OW8 - Rock Ditch 0.70 (ac) 0 (ac) 0.70 (ac) 0 (ac) 0.70 (ac) 0 (ac) 0.70 (ac) 0 (ac) 0.70 (ac) 0 (ac) OW9 - Rock Vane 0.03 (ac) 0 (ac) 0.03 (ac) 0 (ac) 0.03 (ac) 0 (ac) 0.03 (ac) 0 (ac) 0.03 (ac) 0 (ac) OW10 - Riprap Apron - 0.007 (ac) 0 (ac) 0.007 (ac) 0 (ac) 0.007 (ac) 0 (ac) 0.007 (ac) 0 (ac) OW11 - Riprap at Peninsula Access - - - 0.04 (ac) 0 (ac) Cedar Cliff Auxiliary Spillway Upgrade Project March 6, 2023 Page 4 Should you have any questions regarding this submittal or require additional information to amend the existing CWA Section 404/401 Individual Permit, please do not hesitate to contact me at (704) 973- 6878 or eric.mularskiandrinc.com. Regards, Eric Mularski, PWS Senior Environmental Scientist cc. Ken Karably — Duke Energy Alan Stuart — Duke Energy Steve Cahoon — Duke Energy Brian Reinicker — HDR Michael Little — HDR Andrea Leslie — NC Wildlife Resources Commission Attachments: Figures 1 and 2 — Shook Cove Road Boat Ramp Exhibits Figure 3 — 1951 Access Road As -Built and Peninsula Barge Loading Area FIGURE 3 IREV. _ Construction Access Road,\ � — to Remain = 0.43 Acres (included within OW6 \ \ permanent impact footprint) t rint) O (Excavation) / = W7OW6 (Barge\ Access Road 0.63 Acres ) 0.49 Acres \ LEGEND: (requesting temporary / // / / /� CEDAR CLIFF RESERVOIR temorar \ \ \ \ p y EXISTING MINOR CONTOURS j �� e / DRAWDOWN EL 2330.00 impact to b \ — changed to \ / permanent 2350 EXISTING MAJOR CONTOURS impacts to PROPOSED MINOR CONTOURS accommodate PROPOSED MAJOR CONTOURS y/ / � � � L / the proposed 2350 concrete boat FERC LICENSE PROJECT ramp and \ BOUNDARY permanent \ � access r — - - - - — PROPERTY LINE 5 ^ � I J � / /FULL POND EL 2330.00 / \ 3x$ ✓ \ \ / .::: .::`::::::::. :.::........... \ EXISTING OVERHEAD »»»»»>:_:. \ POWER LINE <;:"`-' \ CONCRETE RAMP :: END CURB STA 2 03.1 :::�;`.::::-��-.:. ::.:. \\ ASPHALT PRAP SIZE AND DEPTH AND XTENTSr;l OBE DETERMINED DURIN ESIGN TOP OF ALL EL 23 IIII I I C� / Concrete Boat Ramp - 0.06 ( I N31 Acres (to be included within 1 I TOP OF WAL / fOoWotp6 ripnet)rmanent impact \� � \ 1 o ISTING BOAT RAMP OW8 (Rock Ditch) = 0.70 Acres cn I \ jj /r EXISTING FLOATING DOCK , 232 / �' I \ \ �,�\ \ Mcli - /fl0 - 232 / `:......:. :»»»:::.::;: ; : I I \ ✓ / \ \ TOP OF WALL EL 2315 BOTTOM OF WALL EL 2310 EXISTING OVERHEAD OW10 (Rip Rap I I I POWER LINE Apron) = 0.007 Acres ��6111 TING GATI /I/ / OW9 (Rock Vane) ADA PARKING SPACE \ ADA PORTAJOHN �/ / FERC LICENSE I/ / STRIPED AREA 'PROJECT BOUND � 2 PARKING SPACE (TYP) SHOOK COVE ROAD I \ i FLE AUXILIARY SPILLWAY 1 NMI BOAT RAMP EXHIBIT 41 414 MODIFICATION W. ro, EDAR CLIFF IDF & SPILLWAY UPGRADE HDR Engineering, Inc. of the Carolinas License Number: F-0116 440 S Church Street, Suite 1000 Charlotte, NC 28202-2075 INCHES 1 2 3 TENTHS 10 20 30 PRELIMINARY NOT FOR CONSTRUCTION OR RECORDING 02/03/2023 FOR INFORMATION ONLY PE SEAL I N0. DATE REVISION DUKE ' I Em N E RG" I SCALE: AS NOTED DES: MGL DWG TYPE: DWG DFTR: RMM JOB NO:10060948 CHKD: DATE: 02/03/2023 FILENAME: FIGURE3.DWG APPD: DWG SIZE DRAWING NO. REVISION ANSI D 22.0"x34.0" FIGURE 1 RMM I MGL — — DFTR DES CHKD APPD -n G) 1711 FIGURE 3 REV. CEDAR CLIFF RESERVOIR / /'FULL POND EL 2330.00 � � \ 3x`b ✓ \ \ END CURB II I �L O I I I I STA 2+03.1 TALL RIP RAP ON 2:1 SLOPE. ��' \ i \ II I `L� PRAP SIZE AND DEPTH AND EXTENTS �r O BE DETERMINED DURING DESIGNIV Ok— \l EL 2309.68 TOP OF WALL IIII I II �� PROPERTY LINE / I EL 2320 00 o / — N I I N TOP OF WALL I \ — IQ� � aa a a � EL 2320 4 %10� \ \ \ \ \ N I I EXISTING BOAT RAMP 16" CURO B I ZxO� // /// �g`Z / FERC LICENSE 1\ \ I I I PROJECT BOUNDARY EXISTING FLOATING DOCK \ 2320 �� ✓ i/ i— \ 1 \ N I I I // �r 4 /o� I✓// � \ \ I\ II II \ON \ /� � % wo � • __ P I I I I �// RETAINING WALL / \ , , \ TOP OF WALL N P , / \ 1 N I I I I I \ \ \ r 0 \ EL VARIES j _ TOP OF WALL 15�NG� y EL 2315 i -BOTTOMEL O OPOF WALL FLO SEO Gu r) \ — \ I I EXISTING OVERHEAD P / \ POWER LINE \ � I LEGEND: 2350 OPOSED \ \ \ \ ) �` �)� ��/\�\\ \ / 2350 ' SPHALT PAVEMENT 2340 ADA PARKING SPACE RETAINING WALL / \ . \ �'�\\� \ \ \ , / 1 O' X 20' / \\� o \ \ \ \ \ \ \ \ \ \ \ \ // /i 2330 \ < 2320 \\ ADA PORTAJOHN \ i r / \ STRIPED AREA / PROJECT BOUND Y \ FERC LICENSE\ \ \ \ \ \ \ \ / \ O2300 2310 2% \\\ \ \\ \ /1?10 RAISE STRUCTURE INLET: ELEVATION TO BE DETERMINED IN FINAL DESIGN. �— \ �_\ \ \ \ 2290 EXI TI; G GAT ,— PARKING SPACE (TYP) 1 v � 2280 0+00 \/ EXISTING GRAVEL —� SHOOK COVE ROAD PLAN SCALE: 1 "=30' 2350 CONNECT TO EXISTING CONCRETE I 2350 2340 MATCH EXISTING ELEVATIONS EXISTING GROUND 2340 CEDAR CLIFF RESERVOIR (TEMPORARY CONSTRUCTION ACCESS ROAD) � TOP OF WALL FULL POND EL 2330.00 Sz 2330 = 2330 -14.00% � 2320 — — — — — — — _ — � 2320 zz 2310 — — — — — — — — — — — — — — — — — — — — — — — — --� — 2310 z 153.14' 25.00' 159.28' 2300 2300 w PROPOSED RAMP CONCRETE GRADE TO EL 2310.00 2290 TRANSITION 2290 AREA 2280 2280 2270 2270 0+00 0+50 1+00 1+50 2+00 2+50 3+00 3+50 3+90 STATION PROFILE 1 - SCALE: 1" = 30' Name Cut Factor Fill Factor 2d Area Cut Fill Net Proposed Boat Ramp Grading Volume 1.000 1.000 31622.20 Sq. Ft. 6374.28 Cu. Yd. 1.43 Cu. Yd. 6372.85 Cu. Yd.<Cut> Totals 31622.20 Sq. Ft. 6374.28 Cu. Yd. 1.43 Cu. Yd. 6372.85 Cu. Yd.<Cut> HDR Engineering, Inc. of the Carolinas License Number: F-0116 440 S Church Street, Suite 1000 Charlotte, NC 28202-2075 INCHES 1 2 3 TENTHS 10 20 30 PRELIMINARY NOT FOR CONSTRUCTION OR RECORDING 2350 2340 2330 m 2320 D 2310 z 2300 2290 2280 0+00 0+50 1+00 1+50 2+00 STATION 2 PROFILE - SCALE: 1" = 30' 2350 T — — 0+50 1+00 STATION A SECTION SCALE: 1" = 30' 2+50 3+00 3+50 30 0 SCALE IN FEET TITLE EXISTING MINOR CONTOURS EXISTING MAJOR CONTOURS PROPOSED MINOR CONTOURS PROPOSED MAJOR CONTOURS FERC LICENSE PROJECT BOUNDARY PROPERTY LINE EXISTING OVERHEAD POWER LINE CONCRETE RAMP ASPHALT 2350 — EXISTING 2340 GRADE 2330 z 2320 0 a 2310 J w 2300 2290 2280 1+50 2350 2340 2330 z 2320 LD a 2310 w J w 2300 2290 2280 3+90 AUXILIARY SPILLWAY BOAT RAMP EXHIBIT 30 •1 FOR CEDAR CLIFF IDF & SPILLWAY UPGRADE SCALE: AS NOTED DES: MGL DUKE DWG TYPE: DWG DFTR: RMM JOB NO:10060948 CHKD: Em N E RG" I DATE: 02/03/2023 FILENAME: FIGURE3.DWG APPD: DWG SIZE DRAWING NO. REVISION 02/03/2023 FOR INFORMATION ONLY RMM MGL — — ANSI D PE SEAL NO. DATE REVISION DFTR DES CHKD APPD 22.0"x34.0" FIGURE 2 -1 G) w x m FIGURE 3 REV. 0 PLAN SCALE: 1 "=30' �C /Z /Z F RESERVOIR / N EL 2300.00 CEDAR CLIFF RESERVOIR FULL POND EL 2330.00 N TITLE LEGEND: -2400- EXISTING MAJOR CONTOUR EXISTING MINOR CONTOUR TB TROUT BUFFER TC TURBIDITY CURTAIN CEDAR CLIFF RESERVOIR DRAW DOWN EL 2300 . _ . _ . _ . _ . —CEDAR CLIFF RESERVOIR FULL POND EL 2330 30 0 30 60 SCALE IN FEET AUXILIARY SPILLWAY PENINSULA FOR CEDAR CLIFF IDF & SPILLWAY UPGRADE SCALE: AS NOTED DES: MGL ilk LjU KE DWG TYPE: DWG DFTR : RMM ENEn" Y® JOB NO:10060948 CHKD: DATE: 03/01/2023 0 C M W M HDR Engineering, Inc. of the Carolinas License Number: F-0116 440 S Church Street, Suite 1000 Charlotte, NC 28202-2075 INCHES 1 2 3 ITENTHS 10 20 30 0 03/01/2023 FOR INFORMATION ONLY. PE SEAL N0. DATE REVISION FILENAME: FIGURE 3. DWG DWG SIZE ANSI D RMM MGL 22.0"x34.0" DFTR DES CHKD APPD IAPPD: DRAWING NO. I REVISION FIGURE 3 I 0