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Home My WebLink About20110256 Ver 4_Modifications_20140103��q�,'d��A�4� 7' � � ti � .� y�W��.�� STATE OF NORTH CAROLINA DEPARTMENT OF TRANSPORTATION PA"I'RICK L. MCCRORY Antho�ryTata CiOVERNOR SECRETARI' December 20, 2013 Dear Regulatoty Agencies, The North Carolina Departnlent of Transportation is requesting a modification to the per�nits for the Bonner Bridge Scoui� repair at Bent 166. After fiu-ther consideration and developing inforination, NCDOT has adjusted the footprint of the A-jacks and sandbag configui�ation. This adjushnent will attempt to prevent further scour issues that may occur within this problem area. The attached permits show the new con�gw-ation of A jacks/sandbags around Bent 166 and the addition of inlet floor scour �nats/sandbags between Beuts 162 and 166. Tlle scour mats and sand bags placed between 162 and l65 will lie betwee�� the existing A-jacks that cw�rently parallel the bridge on either side. The addition of these mats and sandbags will provide additional protection against future scour. The modified A jack/sandbag an•a��gement and additional inlet flooi• protectio�l increases the impacted fooiprint. The new total impact area from the A- jacks is 2,814 sq. ft. and the total impacts from the saudbags are 2,334 sq. ft. The scour protection �nats (between 162-166) will i�npact 5,688 sq. fi. of the inlet floor. These three measures total an inlet floor impact of 10,836 sq. feet (0.24 acres). The scow� protection inats will be similar in structure to the gabion mats that have been previously placed around the Bonner Bridge bents. They will consist of individual mats, secured together to create a uniform bed of scour protection arouud the bents. They will lie on the e�istiug inlet floor and not extend about 20 inches. As in previous gabion mat projects, we anticipate these mats to collect sand and be covered within a few weeks of installation. NCDOT �vill commit to all the pi•evious permit conditions and will continue to cotnply with fhe permits as they are modified for the proposed scour prevention from Bent 162 - bent 166. We appreciate any efforts and coordination that can take place to help DOT ineet tliese deadlines, and respond to this emergency maintenance repair. The vicinity il7ap and permit drawings are included with this letter. If you need any additio�lal infoi-ination o�� have any questions concerning this project please call me at 252-482-1876 or 252-339-01 12. Sincerely, Jeny Jeiulings Division Engineer, Division One � Clay Willis �� 1/ Division One Envir mental Officer Cc: Gai-cy Ward, DWQ Sonia Gregory, DWQ Tracey Wheelei•, USACOE Paul Williams, DCM l 13 Airport Drive, Suite 100, Edenton, NC 27932, Phone (252)-482-7977, Fax (252)-482-8722 V � 0 � Q4 ., � V W O � � �� a 0 � � � 0 � � � ` A � � � 0 m . M • � V � ` V � � 0 m i aN o� t� YN � � �N �� ia �U 0 C Q p~ O M Q t �� V M� N o�� N L,_ U � O w'�� o � �n .. r_ °JU-O � \ NC 1 ��I� Q�1�' 1�CC�IE$°�°1�I ��$CCyI[��Il�� '��1� Q�I� I��I��A�� DARE CO U1�lTY LOCATI011L• HERBERT C. B0111111ER BRIDGE AL0111G 111C 12 IN DARE COU11tTY TYPE OF WORK: SCOUR PROTECTI0111 FOR BE11tTS 162-166 Atlantic Ocean PERMIT DRA WI1�GS o.� �� wu�cvKe ,.�vunu ��---� � Roanoke Island Croatan Sound a �� ' � �. d ( O \ I\ � �,� �°_� �, rro�ecr �ocation Pamlico Sound DESIGN DATA PROJECT LEI�lGTH P�'epored !n iP� OlPlce oi: LENGTH OF ROADWAY F.A. PROJECT = wA DIVISI011t OF HIGHWAYS 713 Airport Dr., Edenton, NC 27932 20l2 STANDARD SP6CIFICATfONS LENGTH OF STRUCTURE F.A. PROJECT = N/A TOTAL LENGTH OF STATE PROJECT = N/A ( LETTING DATE: I PR°,E°TE"`�„"LER PROJECT DESIGN ENG/XEER 5YAT6 +TATC F0.W&9' R[fl'WiBNCC INA I�� B-5014C 3TAY6 P0.(11.N41 l'.APRh:.1114 41470.1.1 BRNHS-0012 ; 41470.3.4 BRNHS-0012(: NC 12 �H6ET L �HL�Ef � � uexca�emix PE CONST. STR UCTURES DI VISIOl� 0111E DDC U1�lIT D.H. STALLINGS DRAWIK BY.• _ 50 — 40 — 30 — 20 — 10 — 0 — 10 — 20 — 30 — Qo — 50 — 50 — 70 — IIO — 90 — 100 SPAN 161 SPAN 162 BENT 161 TOC. � EL. 31.81 SPAN 163 SPAN 164 SPAN 165 BENT 162 BENT 163 BENT l64 BENT 165 EXISTING DECK-� TOC. / �EL. 29.35 II EL�F7.14 � � E�F7.40 EXISTING EXISTING I' I' SAND3FILLED " 11 9" GABION GEOTEXTILE SEA MATTRESS I� �' BAGS I' I' 2 LAYERS �� 11�� _---� �� — II II �� u u TIPa TIP. EL. -.65.6 EL. -.60.4 o�� ai O G BRIOGE � N +I � N O�ro EXISTING 3' X 3' X 3' SAND FI�LED GEOTEXTILE SANO BAG (TYP.) SPAN 166 � TOF. � TOF. � TOF. I I EL. 7.27 '� EL. 7.29 EL. 7.30 PROPOSED PROPOSED 3' X 3' X 3' INLET FLOOR SAND FI�LED �� '� ARMORING " " GEOTEXTILE SEA '� " BAGS (TYPJ �� — � 1�"' —il �� ll II Il II II II II II ll II II �� u u u u u u TIP, TSP. TIP, EL. -e60.5 EL. -D60.5 EL. -.60.5 APPROX.ELEVATION AT TOP OF — EXISTING CONCRETE ARMOR UNITS MAX%MUM SCOUR�L%NE P R 0 F I L E SP�,N 167 SPAN 168 BENT 166 BENT 167 BENT 168 TOP OF CAP El. 20.78 TOF. EL. 7.28 PROPOSED CONCRETE I' " ARMOR UNITS � � II � � (TYPJ �� (� � � �� 'I � � � II �� u u TIP, ELe -.60.5 61'-6" 51'-6" 61'-6" 61'-6" 61'-6" 24'-0" 37'-6" 24'-0" 37'-6" 24'-0" 37'-6" 24'-0" 37'-6" 24'-0" 20'-0" 29'-6„ I I I I I 21 7'-6" s BENT 161 ` OQ' � � L PROPOSED 3' X 3' X 3' SAND FILLED GEOTEXTILE 9'-0" SAND BAG (TYPJ (TYPJ EXISTING gENT 162 BENT 163 BENT 164 9" GABION MATTRESS EXISTING CONCPETE 2 LAYERS ARMOR UNITS (TYP.) PROPOSED INLET FLOOR ARMORING P��,N BENT 165 BENT t66 PROPOSED 3' X 3' X 3' � SAND FILLED GEOTEXTILE SAND BAG (TYPJ I I " I i � � � � � � � � U IJ 123'-0" ¢ TOP OF CAP EL. 19.41 � �I�� I� � � � � II � � � � �� -7 7 � 7 T' - I I " I I li Il � � � � I LI IJ APPROXIMATE ELEVATION OF INLET FLOOR ALONG � OF BRIDGE BENT 167 PROPOSED 4' X 4' X 4' SAND FILLED GEOTEXTILE SAND BAG (TYPJ PP.OPOSED CONCRETE ARMORI UNITS (TYPJ BENT 168 ai O � � � APPROXIMATE �OCATION OF EXISTING ARMOR UNITS PROPOSED 3' X 3' X 3' SAND FILLED GEOTEXTILE SEA BAG PLACED IN THE FOOTPRINT OF THE BENT (TYP.) PROPOSED 4' X 4' X 4' SAND FILLED GEOTEXTILE SEA BAG (TYPJ—� APPROXIMATE LOCATION OF EXISTING ARMOR UNITS �� 0 %NLEY FLOOR ARMOR RE(�U%REMENiS THE INLET F�OOR ARMOR SYSTEM SHALL BE 1'-4"— I'-8"THICK. THE INLET FLOOR ARMOR SYSTEM SHALI WEIGH NO LESS THAN 110 PSF. ADJACENT CELLS OF THE INLET ARMOR SYSTEM SHALL BE LACED AND SECURED TO PREVENT INDEPENDENT MOVEMENT. THE IN�ET F�OOR ARMOR SYSTEM SHALL CONSIST OF NO MORE THAN TWO LAYERS. IF THE CONTRACTOR SELECTS A SYSTEM RE(IUIRING MORE THAN ONE LAYER,THE TWO LAYERS SHALL BE LACED AND SECURED SO NO MOVEMENT IS ALLOWED BETWEEN LAYERS. THE CONNECTION BETWEEN ADJACENT LAYERS AND CELIS SHALL BE PER MANUFACTURER'S RECOMMENDATION AND SHALL BE APPROVED BY THE DEPARTMENT. 27'-6„ A 27'-6„ A BENT 166 123'-0" ° � ❑ O O � � ■ � . ■ ■ 123'-0" ¢ �ENT 16� INLET FLOOR IMPACTS BENT 162-166 ESTIMATE CONCRETE ARMOR UNITS 2,814 SQ FT INLET FLOOR ARMOP 5,688 S(l FT 3' SEA BAGS 850 SO FT 4' SEA BAGS 1,484 SQ FT TOTA� IMPACTS 10.836 SQ FT ��•� : SR�� P �� u�� ( i� �i,r'h� ��a`� �iY �i�1� u�l�f ��„i ia p# jt, ;, � �� f � �,l�t� iqr � �,�y,� ,. �� P �+� n� �� . Q !t . ~ry.c BENT 167 SUMMARY OF QUANTITIES BENT 162-166 ESTIMATE ACTUAL CONCRETE ARMOR UNITS 950 EA IN�ET F�OOP. AP,MOR 710 SY 3' SEA BAGS 380 EA 4' SEA BAGS 74 EA PROPOSED CONCRETE ARMOR UNITS BENT 168 4' X 4' X 4' SAND FILLED GEOTEXTILE SEA BAG (TYP.) I��`\\\I�� SECTION A-A I��I�� I��/�``\1i��I�� SECTION B-B NOTE:CONCRETE ARMOR UNITS SHALL BE PLACED NO CIOSER THAN 5'-0"FROM EXISTING PILES WITHOUT APPROVAI Of THE ENGINEER. LEGEND - - - EXISTING PROPOSED — 40 — 30 — 20 — 10 — 0 --10 — -20 -30 MEAN HIGH TIDE LEVEL 1.80' �� PPOPOSED CONCRETE — ANCHOP UNITS (BENT 166) APPROXe TOP ELo -30,0' .� I — -50 E�_v ARIES - - - Q�� -------i---�----�- ► \ r-� �T-- i --�\�--i �- �I V � �I � t I � I I I t� � � �I I I I �,---'---G-I I � � ( � � i i-�---�--�-i i I �� I I � I ABOUTE � BENT� I � ' I I I I I I � I I I � EL. Z10' � 9._5�/z„ I 3,_0„ I g•-6�/z,. I f TOP OF EX. FOOTING (TYP.) (TYP.) (TYP.1 I � � �-�--�--- � -------�_� �,,�- �. , �- �,. � I -r-� N- I i- - - -�} I- - - -f-f � I �- I I I I I I I I I I I I li �� II �I II�� il �� II�� II II �� I I II�I II II �� II ii �� ii �I ( I I' I I I I I I I� I I I I � I I( I I I I �� II II �I �� II II �� II II �� I II �� I ��II ii II I I II II II �� II �I II �� II �I II �� II II II �� II !� II i I I I � I I ( II �� II �� II �� II�I I� II ��II il �I 'I �I ' II '� II '�II il �I �I �� "II "II � I I I I I I I � I I I I I I I �� II �� II II II �� II II II �� II II II �� II II �� II �� II II �� II I I i � I�� "II "II II �� II �I �� II �� II II II �� II II�J ��U � � I I � � I I I I I I I I il II �� II II II �� II �� II �I �I I I I � I I� I �� I �� II �� II II CROSS SECTl01�1 VIEW BE1�lTS 162 166 NOTEa Sond bags to be placed as shown directly below piles -for Bents 162-166, Approxima-�e dimensions per beni- (50' x 24') Elevations of Concrete Anchor Units may vary slightly due to scouringo � NOTEo At i�his elevation of -46aB' on 3 or more piles a contract sholl be let to reinforce inlet floor, �� NOTEe Necessi�fy of second layer of sandbags to be -field determined �� NOTEo Existing anchor units Beni-s 162-1559 Proposed anchor units for Bent 166 only, (As shown on Plan View) MEAN LOW TIDE LEVEL 0.00' PROPOSED 3' X 3' X 3' SAND BAGS TO BE PLACED AT SCOUP APEA DIRECTLY BENEATH BENTS 162-166 �� POTENTIAL SECOND LAYER OF SANDBAGS ( 3' X 3' X 3' ) TOP EL, VARIES �� — PROPOSED CONCRETE ANCHOP UNITS (BENT 166) I I� I s! I I I I� IJ_i �–�1 I I I I» �-� -r ��I i I I I� � � � � � — --y5'��------ — Ii�� II �� II II �� II �� II �� II �� NORTH II� II �� II �� il �� II �� II �� II �i PROPOSED 4' x 4' x 4' ��I I� �� I �� II �� ) �� SAND BAGS (TYPICAL � � � I � � I I � � I I � � I I �� I I�� I �I I I FOR BENTS 162-166) I I � I I I i � I I � � ' I i � I I � i I I �� , i i EL, -46,8' COUNT' ��l ( I� I I � ( I� I� I(� �� CRITICAL SCOUR LEVEL� QUAD: I� � r�, -r,-, i i' I � I� BASIN: ��I �� i i� �I 'i'I II�� III �III �III II�� SUBJE( LEGEND — — — EXISTING PROPOSED — 40 — 30 — 20 — 10 -o — -10 MEAN HIGH TIDE LEVEL 1.80' -20 EXISTING CONCRETE ANCHOR UNITS APPROX, TOP EL, -25,0' TO -3000' -30 I — -40 -50 �� --------�---�----� �; � �--i �T--s---�\�--i �i r � � � � � � � � � � � � � /� � � � ��---�---�—� � � � � � � I �—�---�--�—� � � � j� �� I I ABOUTE C, BENT� I I I I � I I I I � I I --------I .,I ._� ., --TOP OFOEX. 9'5�/2"' 3'-0 3 6/2 � � - FOOTING I (TYPJ ITYPJ (TYPJ �� -�-- -I------�--� I � � �'��T !� --- --� -�� - rt1 . , � . . I -� �+ I- , ,1-� , , 1t , , � IJ II _ �� II II II il II I I il�� II �I II �� II �� II �� I� �� (� (� II �� I �� ) �� II�� II �I �� II �� II II�� II �I II �� II �� il II�� II �I II �� II �� II II�� II �� II �� II �� II �� II II �,� II ii�l II�� II II ��II II �I ��II II �� I II �� I II �� II �I II �� II �I II �� II II �� II II �� II �� II �� II �I II �I II II II II �� II �� II �� II II II �� II II II �� II II II �� II II II �� II �� il � II �II II II ��II II II CR OSS SECTI01� T�IE W SPA1�S 163-166 NOTEo Inlet floor armoring to be placed as shown between bents for Spans 163-166a Elevations o-f Concrete Anchor Units may vary slightly due to scouringo � NOTEa At i-his elevation o� -46e8' on 3 or more piles a contract shall be let to reinfiorce inlet filooro PROPOSED INLET FLOOR ARMORING TO BE PLACED AT SCOUR AREA BETWEEN BENTS (SPANS 163-166) EXISTING CONCRETE ANCHOR UNITS TOP EL, VARIES ______ .. � ��--------- EL�� ARZES +� 5 I I I I I I I I I I I I I I � � _----_ Ii�� IIII IIII IIII IIII III� ��Il - � il �� II II �I �� _ _ ____ _-H-II--f1��r-�+-11--�E-�-11----1i��-tl�� 11j�- --------- - PROPOSED INLET FLOOR II II II (I II II II ARMORING MIN, 16"-20" THICK � � � � � � I I � � I I Noi (TYP, FOR SPANS 163-166) � � �I � �( I � � � � � � I I � � � � � � � � � � I I II� II �� II �� II �� II �� II �� II II�I II II �� II �� I �� II il �I II �i II �� II �i II �� II �� EL, -45,8' �� I II II II II II I�� CPITICAL SCOUR LEVEL�' coi -� -� -�f -� -�f -� � Q u � �T1 � j 1�1 j 1 �I r1�1 �l Ifi BA: � �i I� �i I� �i I� il�, SuE II�� MEAN LOW TIDE LEVEL 0.00' LEGEND — — — EXISTING PROPOSED Emergency Bonner Bridge Repair Bent # 166 Scour Repair .... ; � ti � r �., . -�A`fi* �,` . . . `-i3. . � � ,` � y�a� . , � � . .. � - �; �� . � . . � � � g S � ` � ��. .. � \, � \y rP:� . � � � . .. . . . � . . � � l; ��. y \ ' '�'� � � � � � � q �..Ig�'it "e',Y:�: A� � � ��s� � i .�. �� <\ � � �� . . . . 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