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HomeMy WebLinkAbout20000316 Ver 1_Complete File_20000313State of North Carolina Department of Environment and Natural Resources Division of Water Quality James B. Hunt, Jr., Govemor Wayne McDevitt, Secretary Kerr T. Stevens, Director 6 Tk 1 • • IT NCDENR NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES May 1, 2000 Swain County DWQ Project # 000316 APPROVAL of 401 Water Quality Certification Mr. C.R. Styles, NCDOT Post Office Drawer 250 Bryson City, NC 28713 Dear Mr. Styles: You have our approval, in accordance with the attached conditions, to place fill material in 500 linear feet of streams for the purpose of improving SRI 121, as you described in your application dated March 6, 2000. After reviewing your application, we have decided that this fill is covered by General Water Quality Certification Numbers 3102 and/or 3108. These Certifications allow you to use Nationwide Permit Numbers 14 and/or 26when the Corps of Engineers issues then. In addition, you should get any other federal, state or local permits before you go ahead with your project including (but not limited to) Sediment and Erosion Control, Coastal Stormwater, Non-Discharge and Water Supply Watershed regulations. Also this approval will expire when the accompanying 404 or CAMA permit expires unless otherwise specified in the General Certification. This approval is only valid for the purpose and design that you described in your application. If you change your project, you must notify us and send us a new application. If the property is sold, the new owner must be given a copy of this Certification and approval letter and is thereby responsible for complying with all conditions. If total wetland fills for this project (now or in the future) exceed one acre, compensatory mitigation may be required as described in 15A NCAC 2H .0506 (h). For this approval to be valid, you must follow the conditions listed in the attached certification. This approval shall expire when the corresponding Nationwide Permit expires or as otherwise provided in the General Certification. If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing. You must act within 60 days of the date that you receive this letter. To ask for a hearing, send a written petition which conforms to Chapter I SOB of the North Carolina General Statutes to the Office of Administrative Hearings, P.O. Box 27447, Raleigh, N.C. 276 1 1-7447. This certification and its conditions are final and binding unless you ask for a hearing. This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act. If you have any questions, please telephone John Domey at 919-733-1786. Attachment cc: Wilmington District Corps of Engineers Corps of Engineers Asheville Field Office Asheville DWQ Regional Office File Copy Central Files Division of Water Quality • Environmental Sciences Branch Environmental Sciences Branch, 4401 Reedy Creek Rd, Raleigh, NC 27607 Telephone 919-733-1786 FAX # 733-9959 An Equal Opportunity Affirmative Action Employer 50% recycled/10% post consumer paper MEMORANDUM TO: John Dorney Regional Contact: Kerry ,S. Becker Non-Discharge Branch WO Supervisor: Enrrpst Westall Date: SUBJECT: WETLAND STAFF REPORT AND RECOMMENDATIONS Facility Name NCDOT SR 1121, Watia Road Project Number 00 0316 Recvd From DOT Received Date 3/13/00 Recvd By Region 3/23/2000 Project Type road improvements County Swain County2 Region Asheville Certificates Stream Stream Impacts (ft.) Permit Wetland Wetland Wetland Stream Class Acres Feet Type Type Impact Score Index Prim. Supp. Basin Req. Req. ME 26 Stream P T@) N 12-61 r C ? 40,402. F- 500.00 ?- F 14 [_- 77 _@N F-F-F-F-F-F- F- I F- Mitigation Wetland MitigationType Type Acres Feet I F_ I F_ Is Wetland Rating Sheet Attached? Q Y (0 N Did you request more info? Q Y 6 N Have Project Changes/Conditions Been Discussed With Applicant? Q Y (0 N Is Mitigation required? Q Y # N Recommendation: pQ Issue O Issue/fond p Deny Provided by Region: Latitude (ddmmss) 352109 Longitude (ddmmss) 833413 cc: Regional Office Central Office Page Number 1 Facility Name NCDOT SR 1121, Watia Road County Swain Project Number 00 0316 Regional Contact: Kerry S. Becker Date: 4/14/2000 Comments (continued from page 1): cc: Regional Office Page Number 2 Central Office MEMORANDUM I ?'l. ?? .,'' TO: John Dorney ?? n Regional Contact: Kerry S. Becker Non-Discharge Btan h APR 8 WQ Supervisor: ' Date: OTJ SUBJECT: WETLAND STAFO RE _. P QMMENDATIONS Facility Name NCDOT SR 1121, Watia Road Project Number 00 0316 Recvd From DOT Received Date 3/13/00 Recvd By Region 3/23/2000 Project Type road improvements Certificates Stream troani impacts (ft.) Permit Wetland Wetland Wetland Stream Class Acres Feet ¦ ¦ Type Type Impact Score Index Prim. Supp. Basin Req. Req. Mitigation Wetland MitigationType Type Acres Feet Is Wetland Rating Sheet Attached? 0 Y Dp N Did you request more info? 0 Y 0 N Have Project Changes/Conditions Been Discussed With Applicant? 0 Y Dp N Is Mitigation required? 0 Y Dp N Recommendation: p Issue 0 Issue/Coed 0 Deny Provided by Region: Latitude (ddmmss) 352109 Longitude (ddmmss) 833413 cc: Regional Office Page Number 1 Central Office County Swain County2 Region Asheville TRIAGE CHECKLIST Project Name: Project Number: 6)0,9 County: The attached project has been sent to you for review for the following reasons. Please consider whether a site visit is needed to determine the impacts. Particular attention should focus on the below checked items. Please feel free to call the central office staff member assigned to your region if you need assistance. Stream length impacted. _ Stream determination (i.e. intermittent or perennial, or any channel present). Wetland impact and distance to blue-line surface waters on USGS topo map- Minimization/avoidance options. _ NW 14. (is access to highground or wetlands)? Neuse buffer rules. _ Pond (water) fill (i.e. is the pond drained or holding water)? Pond creation (i.e. in uplands, in a drained channel, or in wetlands). Please locate streams and channels (if any) so that the central office can determine. - Mitigation ratios. - Stormwater pond placed in wetlands. - Ditching in wetlands. 51"`ca Is the applicant's proposed stream/wedand mitigation site available and viable? _ Applicant/consultant has a history of non-compliance (check drawings and application for accuracy). Has project been split from previous work to avoid mitigation requirements? Consistent with pre-application meetings? Cumulative impact concerns. OTHER: M STATE o STATE OF NORTH CAROLINA MAR ? DEPARTMENT OF TRANSPORTATION JAMES B. HUNT JR. E. NORRIS TOLSON GOVERNOR Swain County SR 1121 Mr. Steve Lund, NCDOT Coordinator U. S. Army Corps of Engineers Regulatory Branch 151 Patton Avenue, Room 143 Asheville, NC 28801-5006 Dear Mr. Lund: SECRETARY 000316 The North Carolina Department of Transportation is proposing to grade, drain, base and pave primarily along the existing roadway of SR 1121, Watia Road in Swain County. In order to construct this project in accordance with our current secondary road standards, and due to the rechannelization of Watia Creek (DEM Class C), and the replacement and/or extension of three (3) pipe culverts in three unnamed tributaries of Watia Creek, we are requesting authorization under Section 404 of the Clean Water Act. I am sending a straight-line diagram with our proposed erosion control and construction limits at various sites along this project. In addition, a typical section of the road, drawings for the channel change in Watia Creek and the pipe replacement/extensions in the unnamed tributaries of Watia Creek, general notes and standards on erosion control measures, and a marked County Map are enclosed. We propose to install the new culverts slightly below the existing stream bed elevation where bedrock is not encountered to minimize impact to Wildlife habitat and allow the existing stream gradient to remain as unchanged as physically possible. The best management practices will be used to minimize and control sedimentation and erosion on this project. The construction foreman will review all erosion control measures daily to ensure sedimentation and erosion controls are being effectively controlled. If the planned devices are not functioning as intended, they will immediately be replaced with better devices. The silt fences and other erosion control devices will be in place prior to pipe construction and will remain in place until the project is stabilized. March 6, 2000 PAYMENT RECEIVED P.O. Box 250, Bryson City, NC 28713 Phone (828) 488-2131 Mr. Steve Lund Page 2 March 6, 2000 By copy of this letter I am asking Mr. Mark Davis, Habitat Coordinator Western Mountain District, of the NCWRC to comment directly to you concerning the 404 Nationwide permit request. Also by copy of this letter, I am requesting authorization to proceed under Section 401 of the Clear Water Act from Division of Water Quality. In addition, I am asking Mr. Davis and Mr. Ed Ingle, Area Roadside Environmental Engineer (NCDOT), to comment directly to me concerning this permit request. We would like to begin construction as soon as possible. If further information is required, please advise. Your early review and consideration will be appreciated. Yours r ly, G. ,7F C. R. , P. E. District Engineer CRS:sd atta. cc: Mr. F. D. Martin, P. E., Division Engineer Mr. E. L. Ingle, Area Roadside Environmental Engineer Mr. Mark Davis, Habitat Coordinator W. Mtn. Dist., NCWRC Mr. John Dorney, Water Quality Certification Unit, DWQ P.O. Box 250, Bryson City, NC 28713 Phone (828) 488-2131 DWQ ID: CORPS ACTION ID: NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT #) 42-6/ PRE-CONSTRUCTION NOTIFICATION APPLICATION FOR NATIONWIDE PERMITS THAT REQUIRE: 1. NOTIFICATION TO THE CORPS OF ENGINEERS 2. APPLICATION FOR SECTION 401 CERTIFICATION 3. COORDINATION WITH THE NC DIVISION OF COASTAL MANAGEMENT SEND THE ORIGINAL AND (1) COPY OF THIS COMPLETED FORM TO THE APPROPRIATE FIELD OFFICE OF THE CORPS OF ENGINEERS (SEE AGENCY ADDRESSES SHEET). SEVEN (7) COPIES MUST BE SENT TO THE NC DIVISION OF WATER QUALITY, ATTN: JOHN DORNEY, 4401 REEDY CREEK ROAD, RALEIGH, NC 27607. PI.F.A 2 PRINT. 1. OWNER'S NAME: NC DOT - District Engineer: C R Styles, P.E. 2. MAILING ADDRESS: P.O. Drawer 250 CITY: Bryson City STATE: 2? PROJECT LOCATION ADDRESS, INCLUDING SUBD MAILING ADDRESS ABOVE):: IF// C•- / , t 3, TELEPHONE NUMBER: (HOME) (WORK) (828) 488-2131 4. IF APPLICABLE: AGENT'S NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS, PHONE NUMBER: Same as above # 1 5. LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS TOPOGRAPHIC MAP OR AERIAL PHOTOGRAPHY WITH SCALE):ys•D? C ? 'f l/ COUNTY: 1- U/ R 1 /J NEAREST TOWN OR CITY: , SUBDIVISION NAME: N/A ZIP CODE: 28713 VIS ON NA4E (IF PIFFERENT FROM 1c. , r( ?icl?1 X11 Co. SPECIFIC LOCATION (INCLUDE ROAD NUMBERS, LANDMARKS, ECT.) r rd T z g .N c' 4L ), n tl.) A; c_ c-, ? 6. IMPACTED OR NEAREST STREAM/RIVER: , PL ?,k Dr, !'1 CIA SS Cw, -?4. 1> c 40r RIVER BASIN: L. ,-f ?r /?r+M c? J? a v ri n ?' 7. (a) IS PROJECT LOCATED NEAR WATER CLASSIFIED AS TROUT, TIDAL SALTWATER, (SA), HIGH QUALITY WATERS (HQW), OUTSTANDING RESOURCE WATERS (ORW), WATER SUPPLY (WS-I OR WS-II)? YES [] NO IGI IF YES, EXPLAIN: (b) IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA DIVISION OF COASTAL MANAGEMENT AREA OF ENVIRONMENTAL CONCERN (AEC)? YES p NOA [c] IF THE PROJECT IS LOCATED WITHIN A COASTAL COUNTY (SEE PAGE 7 FOR LIST OF COASTAL COUNTIES), WHAT IS THE LAND USE PLAN (LUP) DESIGNATION? _ 8. (a) HAVE ANY SECTION 404 PERMITS BEEN PREVIOUSLY REQUESTED FOR USE ON THIS PROJECT? YES O NOW IF YES, PROVIDE ACTION I.D. NUMBER OF PREVIOUS PERMIT AND ANY ADDITIONAL INFORMATION (INCLUDE PHOTOCOPY OF 401 CERTIFICATION): (b) ARE ADDITIONAL PERMIT REQUESTS EXPECTED FOR THIS PROPERTY IN THE FUTURE? YES p NO X IF YES, DESCRIBE ANTICIPATED WORK: (a) ESTIMATED TOTAL NUMBERS OF ACRES IN TRACT OF LAND: (b) ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE: 10. (a) NUMBER OF ACRES OF WETLANDS IMPACTED BY THE PROPOSED PROJECT BY: FILLING: FLOODING: DRAINAGE : EXCAVATION: OTHER: TOTAL ACRES TO BE IMPACTED: (b) (1) STREAM CHANNEL TO BE IMPACTED BY THE PROPOSED PROJECT (IF RELOCATED, PROVIDE DISTANCE BOTH BEFORE AND AFTER RELOCATION: LENGTH BEFORE: ,5U 0 FT WIDTH BEFORE (based on normal high water contours): WIDTH AFTER: AFTER: -5 e-> O FT FT FT AVERAGE DEPTH BEFORE: / FT AFTER: FT (a) IF YES, DOES THE PROJECT REQUIRE PREPARATION OF AN ENVIRONMENTAL DOCUMENT PURSUANT TO THE REQUIREMENTS OF THE NORTH CAROLINA ENVIRONMENTAL POLICY ACT? YES ? NO PC (b) IF YES, HAS THE DOCUMENT BEEN REVIEWED THROUGH THE NORTH CAROLINA DEPARTMENT OF ADMINISTRATION STATE CLEARINGHOUSE YES ? NO ? N/A IF ANSWER 17b IS YES, THEN SUBMIT APPROPRIATE DOCUMENTATION FROM THE STATE CLEARINGHOUSE WITH THE NORTH CAROLINA ENVIRONMENTAL POLICY ACT, QUESTIONS REGARDING THE STATE CLEARINGHOUSE REVIEW PROCESS SHOULD BE DIRECTED TO MS. CHRYS BAGGETT, DIRECTOR STATE CLEARINGHOUSE, NORTH CAROLINA DEPARTMENT OF ADMINISTRATION, 116 WEST JONES STREET, RALEIGH, NORTH CAROLINA 27603-8003, TELEPHONE (919) 733-6369. 18. THE FOLLOWING ITEMS SHOULD BE INCLUDED WITH THIS APPLICATION IF PROPOSED ACTIVITY INVOLVES THE DISCHARGE OF EXCAVATED OF FILL MATERIAL INTO WETLANDS: (a) WETLAND DELINEATION MAP SHOWING ALL WETLANDS, STREAMS, LAKES, AND PONDS ON THE PROPERTY (FOR NATIONWIDE PERMIT NUMBERS 14, 18, 21, 26, 29, AND 38). ALL STREAM (INTERMITTENT AND PERMANENT) ON THE PROPERTY MUST BE SHOWN ON THE MAP. MAP SCALES SHOULD BE 1 INCH EQUALS 50 FEET OF 1 INCH EQUALS 100 FEET OF THEIR EQUIVALENT. (b) IF AVAILABLE, REPRESENTATIVE PHOTOGRAPH OF WETLANDS TO BE IMPACTED BY PRODUCT. [c] IF DELINEATION WAS PERFORMED BY A CONSULTANT, INCLUDE ALL DATA SHEETS RELEVANT TO THE PLACEMENT OF THE DELINEATION LINE. (d) ATTACH A COPY OF THE STORMWATER MANAGEMENT PLAN IF REQUIRED. (e) WHAT IS LAND USE OF SURROUNDING PROPERTY? (o IF APPLICABLE, WHAT IS PROPOSED METHOD OF SEWAGE DISPOSAL? N/A (g) SIGNED AND DATED AGENT AUTHORIZATION LETTER, IF APPLICABLE. NOTE: WETLANDS OR WATERS OF THE US MAY NOT BE IMPACTED PRIOR TO: 1. ISSUANCE OF A SECTION 404 CORPS OF ENGINEERS PERMIT, 2. EITHER THE ISSUANCE OR WAIVER OF A 401 DIVISION OF WATER QUALITY CERTIFICATION, AND 3. (N THE TWENTY COASTAL COUNTIES ONLY), A LETTER FROM THE NORTH CAROLINA DIVISION OF COASTAL MANAGEMENT STATING THE PROPOSED ACTIVITY IS CONSISTENT WITH THE NORTH CAROLINA COASTAL MANAGEMENT PROGRAM. c_ - OWNER'S/AGENT'S SI ATURE 1, 0 0 ATE (AGENT'S SIGNATURE VALID ONLY IF AUTHORIZATION LETTER FROM 4 (b) (2) STREAM CHANNEL IMPACTS WILL RESULT FROM: (CHECK ALL THAT APPLY) OPEN CHANNEL RELOCATION: -S'o o ! PLACEMENT OF PIPE IN CHANNEL: CHANNEL EXCAVATION: CONSTRUCTION OF A DAM/FLOODING: OTHER: 11. IF CONSTRUCTION OF A POND IS PROPOSED, WHAT IS THE SIZE OF THE WATERSHED DRAINING TO THE POND? N/A WHAT IS THE EXPECTED POND SURFACE AREA? N/A 12. DESCRIPTION OF PROPOSED WORK INCLUDING DISCUSSION OF TYPE OF MECHANICAL EQUIPMENT TO BE USED? (ATTACH PLANS: 8 %:" BY 11" DRAWINGS ONLY): To widen and pave SR //'Z I to meet current NCDOT Standards by use of track hoes, bulldozers, duma trucks, back hoes, manual labor, etc. 13. PURPOSE OF PROPOSED WORK: Same as above in # 12 14. STATE REASONS WHY IT IS BELIEVED THAT THIS ACTIVITY MUST BE CARRIED OUT N WETLANDS (INCLUDE ANY MEASURES TAKEN TO MINIMIZE WETLAND IMPACTS) To gain the needed width to build SR // Z ) to NCDOT Standards. Al1-Channel changes will be constructed in the dry. Ri p-rap will only be used for bank stabilization. Alders, Red Maples, Black Walnuts, Willows Sycamres Dogwoods etc will be re-established on the banks. All pipe replacements will be placed slightly below the existing strearrbed gradient so natural 15. YOU ARE REQUIRED TO CONTACT THE US FISH AND WILDLIFE SERVICE AND/OR NATIONAL MARINE FISHERIES SERVICE REGARDING THE PRESENCE OF ANY FEDERALLY LISTED OR PROPOSED FOR LISTING ENDANGERED OR THREATENED SPECIES OR CRITICAL HABITAT N THE PERMIT AREA THAT MAY BE AFFECTED BY THE PROPOSED PROJECT. DATE CONTACTED: Handled by Corps. 16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC PRESERVATION OFFICER (SHPO) REGARDING THE PRESENCE OF HISTORIC PROPERTIES IN THE PERMIT AREA WHICH MAY BE AFFECTED BY THE PROPOSED PROJECT. DATE CONTACTED: Handled by Corps. 17. DOES THE PROJECT INVOLVE AN EXPENDITURE OF PUBLIC FUNDS OT THE USE OF PUBLIC (STATE) LAND? YES ?q NO C] (IF NO, GO TO 18) _ S ? 1l 4- 1 r RAVEN DEN ?' / ELEV. 4.247 " A-rTA l?OfizlU,y \ \• /'•/ BEAR*ALLON KNCB ?? ; • ELEv. 4.954 , 1' ; err/' '\ /v1•' O .,..?? U N T A •., I N= S • ', HIGH ROCKS 1 < •\/' • . m , • ,y ELEV. 5.190 \ T •1 2 1 ,i S- ?l t L ROTO1110 ?c G I v £ G c tj f) TYRE TOR ? rti/? •.. 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I , \'t' ?' - \I?,. `'` 1 ? \,r l?-'?T' J`l ?i ,. ??. ^,• _ `{ `•i ?` 't`. ., _`?• - ,'J?/'\? •j,{ ,•'i -??: ? , /; f ? f %? /G't'r lot _ 1 'r ? is ?` -? ?. - v ??1 ?''j f•',,? .,` i AitJ CO. ROAD NAME GJA-rl A /tZl S.R W.O. FROM En/D o F N?ln? CoNsTRuCT/aN 3, goo To CT ADDITION IMPROVEMENT TO BE PAVED P POLES TO BE MOVED T. POLES TO E MOVED R /W WIDTH . SCALE p A r6- RcV1s 6-D `7 .6 ' I" =50' tl -/Z96 3--6 - 00 I' 3' ?'?oo s goo GARLftA uIALLS ? Ste! Y?S? Re% cd ?i9,2 1Aj WA/ S ,Zs zG GcJ/J ?ii9 15, Ry Z. o r leol ovc U N K NoWN ,? tso ? cI T o ?? GJAI?S R4. 'So/ z a /z s3,.::2/ " a, v ele. .415' I o tov I I 3 t7o f 2S .9 Dom. c?? `/ ?To e Z? v }.. J.7, U NKNO VJ14 i a e a a `d O Vol o Boa -r PI vIALLE -?IQ /A//v I'd / O ?^TNG /L &2yso/V /p?c}? !d goo i 9 ?-so tSo= 7175 Gi9,b 6,a vs 7"0 III c- (? c ?f A \J t?U 5 2ofo ed fao I I Sao S /500 /5 f00 I jrOXIV fyrv4us0 'Po. Bo/ 20 87 13Ryso,? C?, ?, Ne ?I cr iz?-ao i v I i ^? ? ? t Od 4 I2y,, cMPI t I ,j Ito 00 a0 foo s' 1 IT u 4KNOW J LOP RC) 18t4-o , Sinn ??n-?"vS? i ?? I cI i V, 1 4, P-" 4 I I ?I tl I i I1 i s tom ? Shoo C; , J O\c1 n?i9 n-r u SO cr-I vI Iv d I 3 6„ I p a I I I I in 1M U NKNDYN 0 UJOC? Ar? aS- -L -zd".) rn ?,C-) rn+0So PS %5 3191 I I 306 I I ?I 02/0 1 10 CAnoe Labf:? A)on , -? ?;. ?i0P-j I ? 1 8' I G P I I t I I u(40oNo /? ? ? ?-v n l.J ooCr ? rCJ F- ?5 ?vo C P 3 k5 ?I I cr-? i i I i 4 d 1 g„ 0 400 A-1 At, 4-C I of fY)tZi6A W tN? t?.o?Ecr O::` r?2 U?occ? Nrj 336 vJ ?a;r `??._ 38 too nl l? o S?-C t cI ? dI .I- I TEMP .STONE DITCH CHECK ,. ROCK SILT CHECK D f : r SILT - -BASIN :- - B TEMP SLOPE DRAIN TEMP SILT DITCH -TSD- EARTH EMBANKMENT SI LT FEUCE -411 H, i1i - FI BERGU.S S ROVING - EGPRIP RAP ????? TEMPORARY SILT FENCE: A temporary silt fence is commonly used at the toe of a fill section to prevent off- site sedimentation. It is made of permeable filter fabric buried at the bottom, stretched and supported by steel posts. The silt fence reduces the water flowwhile retaining the sediment. They may also be used to divert water flow to protected outlets. Silt fences need to be checked after each significant rainfall to ensure there effectiveness. They must be maintained on a regular basis. Silt fences shall not be installed across streams, ditches, or waterways. AREAS OF USE: • At toe of fill sections where sediment runoff can be stored and contained inside the project limits. DESIGN CRITERIA: Material With Wire Without Wire Fabric Type 3 Class A Type 3 Class B Steel posts length 5 ft 5 ft. Post spacing 10 ft. 6 ft. maximum 17 March, 1992 f l- Z .. ?iI I t r..O ?? fi?I-T z » IIIi UU II W LLJ ?IIII °? u fit i I--------- ww Z W J M-7 cn u U I (a z p ^-i I 1 ."..w N < W l i O F° _ C" E- I I I r G .? _K W -_ C < r _ I I ?L G _ Z w --i F C. 11 . Z ? Q ? ? ? U .r. ?I I I ? T n © L ^L W .. . Z ?4 Cm L3 ] z< Cr < F < = 4, Q C C GN C:`FW n? 0 ZWC4 G z - v? <Z < C4 0 a. C4 !Z, fE.c `? pC CpWFN©E i ? -? © ^ F < >, V) Cm La 0 w 0 6 < C- cz0 E- C4 FO FZC7=-C4W-3 Z.=:Z ? WC Z" ?-Wtw p V) i7 CC?cOU"CO7F iV]FU'? f ?;0 I 1J qm E 3 ¢t:. NC?Cc] Z r lNl G Z O zLc C- 4.<. <-3 Z -ON OCR q ?¢ _ T -2 w. to 0.a 2 F f/1 t = 'O Z' ¢ 18 March,1992 SILT BASIN TYPE-B: A silt basin type-B is a temporary basin built to collect sediment flowing through a drainage way. The silt basin is built at the base of the ditch with its length being at least 2 times the width of the basin. The type-B silt basin is generally built in conjunction with temporary rock silt checks and other devices that control or slow down water flow. This device must be monitored closely and cleaned out on a regular basis until grass is established along the ditch line and sedimentation is no longer a problem. AREAS OF USE: • In conjunction with temporary rock silt checks and other devices used in drainage ditches. DESIGN CRITERIA: Width - variable Length - 2 times width Depth - 2 ft. minimum storage - 1800 cubic feet/acre (equals L x W x D) 23 March, 1992 p?N SILO N i Z Q J a 24 II III ? 111111 = G - = a = it I ? Ill I!II! 7 llll! 1I! it - IIIII! 77 111-1 IIII? _ !II. - N - Illli ;III. I ICI ? - ail I W ! III: - i!!III - o = h - i m Ic; 0 Q w J w m W CL Zf z cQ m ... U zZ.C ?O~ ? C= N ;Z - z t ?. i E 1\V March,1992 m 70 mm ?a ROCK PIPE INLET PROTECTION TYPE-A: 0 %o;a°° A rock pipe inlet protection type-A is a horseshoe shaped structure with a built-in sediment storage area around the outside perimeter of the structure. The type-A rock pipe inlet protection shall be used at pipe inlets no larger than 36 inches in diameter where it is receiving flow from several directions. The type-A rock pipe inlet protection utilizes class-B stone lined with #5 or #57 stone to protect drainage pipe structures by trapping sediment before it enters. They have a sediment storage pit which is designed by the same procedures as a silt basin. AREAS OF USE: • At inlets to pipes no larger than 36 inches in diameter where it receives flow from several directions. • In areas where it can be cleaned and maintained on a regular basis. DESIGN CRITERIA: • Structural stone - class-B stone • Sediment control stone - #5 or #57 stone • Sediment storage area - 1800 cubic ft./acre • Dam height - 3 ft. minimum 33 March, 1992 ZI© p d.n z f'C, O a CC u J 2 ? ? Q Q wa I Z r` '`• a W W CL a- CL CL i cD Cl) w . I f- > , cc ' Z W, O W ?rjcp 1 J } 5`r?.. _ C- /•r }r%j ^ /•? N W _Z Lli Lli LLJ cr a O Q- E t!•) to W U ? . W W N _ W .s Z ¢ W Z Ate' F O o Z O F W Z O lj Q= Z y, N oN m A E a o F a w m w Q W a4m0 ?zm-4 coC° a owowW © awFCm wCC4 ° Q E- Z C+. G. E C) C W U N N F- Z' W0 A F? N O? 4? Z Z ¢ A 4? O O. cn Ov1wE-0 [4 r,?o =pa4 2 V ZZA??f?O ^awz LL F N W F O W W 7 F W U] C3 N 0' :.•' O I ¢m¢tFl1O•cm4FLl.00C4 F3Z N r1¢ a ?W : W CrAc7?Z¢UF-CL WC4 - W E.U-?F F :t W C4 E FN co ¢ZZZ¢O W Zin U C4 I= ^? o O W Z O O O w F 0 C O U E- w : W °J n Z m N U F U V) En ?+ 4 U 4 0 E- Z 34 I Q March,1992 ROCK SILT SCREEN: A rock silt screen is a low-level dam structure to be used in streams below culvert sites. Rock silt screens shall be used to trap sediment transported by running water and shall be placed in the stream below the construction site within the right-of- way or easement boundary. The rock silt screen utilizes class B stone lined with #5 or #57 stone to produce a ripple-effect in the stream to settle the larger sediment particles transported in the stream from the construction site. The trapped sediment shall be cleaned out before the device is removed from the stream. AREAS OF USE: In live streams below construction sites where construction occurs in or adjacent to the stream. In live streams below a culvert construction site. Where it can be cleaned before it is removed from stream. DESIGN CRITERIA: Structural stone - class B stone Sediment control stone - # 5 or # 57 stone Dam height - 1.5 ft. minimum and 3 ft. maximum ( shall not be higher than 1 ft. above normal flow of stream) 37 March, 1992 r w w N O d O Co 1 I i6 m 4 O b r a 0 0 J W Co E- Z J -C Z GZE.., ¢ OE-CO E-- W OE-? C/) Z Z E- Cn E- ` C+ C) C4 Co C4 u Zn<CU JZC? ¢O ° W J 00Co OCW CC CN -CL< F W C, C C ZO 4Z' GGC Co O F O O L = o Z W W O ¢O <<z W UOCln OOOOOZ Cu CU 4.O W : E•z O CG] E•-y ZW E=-W v C4E-0m4C,]ZErC4 U3> C C J C p J W¢ W C x J¢ :: W V) E-. -.3 E- V) W J Z U E- < -2 E- E-? Z <ZZ <0 '- ¢9c--== <E- C- O? W 0=00-3 r0CO ="W z ©U EnUE- V VCnCa CLU fn..- O 2 H cD Z 0 LL x a I = ? W o z O 41 <1I jJ OL a u W N N ^t N O U / n N 0 W W N 0. Z z J wJ U En J Z =Z O Cr_ O ?i Ol Q V / !o I 0 O,. Z ' C. 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