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HomeMy WebLinkAbout20000421 Ver 1_Complete File_20000330State of North Carolina Department of Environment and Natural Resources Division of Water Quality James B. Hunt, Jr., Governor Bill Holman, Secretary Kerr T. Stevens, Director Mr. C.R. Styles District Engineer o` Di[E ?IR NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES May 30, 2000 Jackson County DWQ Project # 000421 APPROVAL of 401 Water Quality Certification and ADDITIONAL CONDITIONS NC DOT Post Office Box 250 Bryson City, NC 28713 Dear Ms. Steed: You have our approval. in accordance with the attached conditions and those listed below, to place fill material in 200 linear feet of streams for the purpose of improving SR1413 as described in your application dated March 22. 2000. After reviewing your application. we have decided that this fill is covered by General Water Quality Certification Number 3102. This certification allows you to use Nationwide Permit Number 14 when the Corps of Engineers issues it. 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 Stormwatcr. Non- Discharge and Water Supply Water shed regulations. 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 except as modified below. If you change your project, you must notify us and you may be required to 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) (6) and (7). For this approval to be valid, you must follow the conditions listed in the attached certification and any additional conditions listed below. 1. The stream relocation plan described in the application shall be copied on an as-built plan upon completion. 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 150B of the North Carolina General Statutes to the Office of Administrative Hearings, P.O. Box 27447, Raleigh, N.C. 27611-7447. 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 Dorney at 919-733-9636. S' c e tevens Attachment cc: Corps of Engineers Asheville Field Office Asheville DWQ Regional Office File copy Central Files Division of Water Duality - Non-Discharge Branch 1621 Mail Service Center Raleigh NC 27669-1621 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: Non-Discharge Branch WQ Supervisor: Date: SUBJECT: WETLAND STAFF REPORT AND RECOMMENDATIONS Facility Name NC DOT --- SR 1413 Project Number 00 0421 Recvd From APP Received Date 3130100 Recvd By Region 4/12/2000 Project Type state road paving County Jackson County2 Region Asheville Certificates Stream Stream Impacts (ft.) Permit Wetland Wetland Wetland Stream Class Acres Feet L 1EC1?i LEI Type Type Impact Score Index Prim. Supp. Basin Req. Req. *1:I 14 Stream PT _&N F-2-79-38 F-c-?- 40,402. 1200.00 200.00 F- Mitigation Wetland MitigationType Type Acres Feet I F-1 - F_ Is Wetland Rating Sheet Attached? Q Y OO N Did you request more info? Q Y oO N Have Project Changes/Conditions Been Discussed With Applicant? Q Y O N Is Mitigation required? p Y O N Recommendation: OQ Issue O Issue/fond O Deny Provided by Region: Latitude (ddmmss) 352457 Longitude (ddmmss) 832123 Comments: The proposed stream relocation should not permanently*mpact downstream nor impair the health of the stream The relocation could be considered as mitigation at one to one. This is goofy but - what's new. cc: Regional Office Page Number 1 Central Office Facility Name NC DOT --- SR 1413 County Jackson Project Number 00 0421 Regional Contact: W. E. Anderson Date: 5/15/2000 Comments (continued from page 1): cc: Regional Office Central Office Page Number 2 0& STATE MAR " n ?r?i-??? Vin. r STATE OF NORTH CAROLINA DEPARTMENT OF TRANSPORTATION JAMES B. HUNT JR. GOVERNOR E. NOMS TOLSON SECRETARY March 22, 2000 Jackson County SR 1413 Mr. Steve Lund, NCDOT Coordinator U. S. Army Corps of Engineers Regulatory Branch 151 Patton Avenue, Room 143 Asheville, NC 28801-5006 Q()04 2 1 Dear Mr. Lund: The North Carolina Department of Transportation is proposing to grade, drain, base and pave primarily along the existing roadway of SR 1413, Thomas Cove Road in Jackson County. In order to construct this project in accordance with our current secondary road standards, and due to the rechannelization of an unnamed tributary to the Tuckasegee River (DEM Class B), the addition of one (1) pipe culvert, and the replacement and/or extension of two (2) pipe culverts in three unnamed tributaries of the Tuckasegee River, 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 unnamed tributary to the Tuckasegee River and the pipe addition/replacements/extensions in the unnamed tributaries of the Tuckasegee River, 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. P.O. Box 250, Bryson City, NC 28713 Phone (828) 488-2131 Mr. Steve Lund Page 2 March 22, 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 i C-? C. R. s, 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 O Q d CORPS ACTION ID: NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT #) /417-6 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. PLEASE PRINT. 1. OWNER'S NAME: NC DOT - District Engineer: C R. Styles, P.E. 2. MAILING ADDRESS: P.O. Drawer 250 SUBDIVISION NAME: N/A CITY: Bryson Ci ty STATE: ZIP CODE: 28713 PROJECT LOCATION ADDRESS, INCLUDING SUBDIVISION; TAME (IF DIF?ERENT FROM L,, C ?dj Cc, MAILING ADDRESS ABOVE): U I? Tjlcl rn (A _S C GYP IPd c, 7- 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 LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS TOPOGRAPHIC MAP OR AERIAL PHOTOGRAPHY WITH SCALE): / '3 T/ COUNTY: C i _s o -0 NEAREST TOWN OR CITY: IA .-e r SPECIFIC LOCATION (INCLUDE ROAD NUMBERS, LANDMARKS, ECT.) 1Z I y 13 , / io l,% v s C?,?Q IMPACTED OR NEAREST STREAM/RIVER: i h r e, E t/ A f\ rrQ, _/r, , ?L,axe Ill ! r(bcm Clo•sS $ RIVER BASIN: L ? 741 Q I em, vsse,? i ?? r Rex, 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 F1 NO X IF YES, EXPLAIN: (b) IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA DIVISION OF COASTAL MANAGEMENT AREA OF ENVIRONMENTAL CONCERN (AEC)? YES F? NO,4 [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? _ (a) HAVE ANY SECTION 404 PERMITS BEEN PREVIOUSLY REQUESTED FOR USE ON THIS PROJECT? YES[] NO?ff 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 E] NO V IF YES, DESCRIBE ANTICIPATED WORK: 9. (a) ESTIMATED TOTAL NUMBERS OF ACRES IN TRACT OF LAND: 3? 9 1 (b) ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE: d pi t 10. (a) NUMBER OF ACRES OF WETLANDS IMPACTED BY THE PROPOSED PROJECT BY: FILLING: EXCAVATION: FLOODING: OTHER : DRAINAGE : 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: z U a FT AFTER: FT WIDTH BEFORE (based on normal high water contours): 7 FT WIDTH AFTER: q FT AVERAGE DEPTH BEFORE: 0. 7-5- FT AFTER: C?. ? r FT (b) (2) STREAM CHANNEL IMPACTS WILL RESULT FROM: (CHECK ALL THAT APPLY t OPEN CHANNEL RELOCATION: Z C' 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 1 W 13 to meet current NCDOT Standards by use of track hoes, bulldozers, dLyp trucks, back hoes, nanual 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) Tn nain flip nppded width to build SR / 4//,3 to NCDOT Standards. Al1-Channel changes will be constructed in the dry Rip -rap will only be used for bank stabilization. Alders, Red Maples, _Black Walnuts Willows Sycamores DQggKdS etc will be re-established on the banks. All _pipe replacements will be placed slightly below the existing streambed 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 IN 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 NO ? (IF NO, GO TO 18) (a) IF YES, DOES THE PROJECT REQUIRE PREPARATION OF AN ENVIRONMENTAL DOCUMENT PURSUANT TO THE REQUIREMENTS OF THE NORTH CAROLINA ENVIRONMENTAL POLICY ACT? YES E] NO P( (b) IF YES, HAS THE DOCUMENT BEEN REVIEWED THROUGH THE NORTH CAROLINA DEPARTMENT OF ADMINISTRATION STATE CLEARINGHOUSE YES O NO Ej 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? _Ri,r l woodland, Residpntia (f) 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. 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'.' ?.:• .......... ....... . mowing Unlit Guard Rail ..' •. ' .....:. , ,' '• ? ,' Y ?• ... ...... •.. Sanitary Sewer-Line. ............... Water Lint...'....'.:. • ......... . • C a 5 _Q_____ Gas Line .'.....r:...' :............. • . ?• ??ttUt'U51:u. r:?ciS•i•iNc Chain Liiil: fence.' .................. . Woven Wire fence':....... .......... -c? --"-?--_ ^- RecicneraciotI ....'..:........ , • : • ..... •?' :Reforestation •:..::....•................ : ' t S i °-._--- ' Teni1 porarv Silt Ditch Te iii' o rrv S it c Fe p 11 c: c• rat Y.SloPe Di-aitl' .:...:...•...... : . Teni po r ' , • .? ..Brush Barr•itn' +: .• . ..:..........M.. ; Silt Check Dam'1?q)eA•••.•••••••.•..... n Silt Checlc Dam 1ype.B ..'........ a ... . ...:?..........' --?• '.Silt Basin Z?•pe *A' ....... Silt Basiri Type B?.'........?..:.:....... r Roclc Silc Clieclc Dam .............. . !:--1al Lh Berm :..-......... . Temp,. 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I 18 C'uI - IA 20 a ??33 X 'v vseD ,30 '`mil ?o goo 0 ??..?b f85 S?Ri,?G?GlcA? %o 13c P.%>t d Qu/ 4 L /leeV o S/a.,29 X75 Sao- 3orZ-Z 30 -v-S NEED .20 ,c 2S' p•9sT ,W4-1 - -' r=v,e Kp ?P Ott:,/T? ,6F. o. P. 3eo 1 , ,31 8? 4r. 0. nA P, oP. 3oxS27 Of I ? tee- !I 4 , Y-GS I c?hP .3S ? 6 5 ,?S zy I 13s moo 35too ............................... .................. ............. .......... .... ............... ..... TEMP -STONE . DITCH CHECK. ROCK. SILT CHECK IMAM SILT.- .-BASIN '. - B. N\N TEMP SLOPE DRAIN TEMP SILT DITCH -TSD- EARTH EMBANKMENT SILT FENCE FIBERGLASS ROVING EGR RI P RAP P a 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 a III- ?:°. i I I ?• CO i III z a w i:, t,• mot:: ¢ -_ T I I ---o------ WOE LL.) W:c- ?Y I I W? ~ i4- C4 lfL' ? C7 :Yn ?a -» 1'71 T U `? 1 C ? r1 am rj! W tsa rs < A r-? ?- E.O >? Cz. F cr o? X QW _ x _? E- 4- I I? v?Z O F- = CL .s N - C 1 ¢ C w" 0= W = Z f•- O? ?- O<? LqW -rL ?r -1 Q =Wf? <-?FLOW] W !•?\? Cy < ? q ¢ O W ? ? f_ W cr , Uq. Q A A?. G ? ?F <zW?'.-?F z= << <E ci /n QZ - <Wd00. W Z, V/ C3 w E- Mw x W A W q q Z C4 OFV W WzA G<F - W E O ? F Z V C4 : W -1 ? z. _• Ot i co ?CA.7z???U?E Czl O.i'al I O W W- . U_t7FWF-UW Aq z O C. G W4.<?WZ ; a. Q ; - crW. O F_ . .' P: ? m Z• a 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 pIN iD O I tCf lIN ' 111111 _ ; \1 `? =` • -„I =11 1 i= ?-l 1 : .> >` Illil . li i . - II l M ? CiQ J (n Z< r, Q . - !I Z _ LO 'NYn VA .. 11 ? _ 1,, .it?1: = o = - x.11 .?:. \ . ? ] _ _ O• . i /O? I ` Q I I 24 March,1992 ROCK PIPE INLET PROTECTION TYPE-A: a1 a? v moo 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 z o =1r z ;- . a O L O Cr LSE U nit Q J 0 X I <i j w Q w I" w L1J IL Z ( CL CL s . w ' CL CL CL 1 }. Cr J I w L i ?•• i (D > (1- 1 M ( C: 1 z ?w( i 1 > 1 1 Z ( r-- ? 1,: x_11.^,''? ? W -•f ( • l ?l.'V LLI C:: MO Z 1? •._'?-`i ..•r:: '=L',?4 '.'? ?-.f?:Y \JL C.. ` GOB C)( LLJ =Z LLJ .t'.'t?t'?7)»-.l''ri ,'? Y'?.•.?`75• cif %..?? LLJ r \ C: 1-y Q (n in u E-- E- Q U s o C? .••7 W W F _ w w LLJ Q Z Z AZE- O o N z O W Z O C` ¢ Z rv O r!1 A F C. O F 0. W = m N Ez Z 6 O F= U w Q w¢ V 0 -] Z W U D A ¢ U Z Q; W O A w w o Z Ow00.w©0.Z 7 rn wc. r O ?ZG-0.? FO.-.3Z C_ C4 7 V) N Q W EO A y o to ¢ V Z Gj ¢ Z GU7 O r : z' f-- ¢ to ¢ < U 0 O Z a. C4 Op O• Ln ?Ma.aw-3E_z wE'oFZwcnw As o.awz ? z z ? cn FNW E-O W WZE'w toOCn O 0:CiO ! =aavE'io ?w¢FC,ozE¢,3z (n l; f;` U E- C4 C4 F? ¢ ¢0 UZAUT. W !N' NCo ZZZ? O WZ000 FO O UF'. •x ° Z' 34 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 m O CL Q 0 Y `a 0 ., W W F _ Z p E W Z O O¢= Z p r o N Z F a O_ F- CL W E- J cn p6¢fn O - ?-WCa. W W O ,, Z W V p O ZU1: RUC O C7 aW W W 0 0 m 0= W == W F ?W Gi[L ZO ¢Z. C-W W J?V)aE-0 O0m0ZWW°0 a ", ?0V) E°,.,o°oz o CC"-3CL W Fz°C4 FyZ W FW W HO©CZ.7 W ZE-FGW.1?= W> L)oom¢N: -M< a.0_m© CE.= : U10..7 W ¢W=X-3 W E fnE-aE- m W--3Z UF¢-JE- E-CO Z 6ZZ¢?GOL'- Z:2 <E C- O 140=00W ,-O Lo -_C` W Z mUV)UE-U WmL6C1.U fn - ° a W N :It W Z 0 x i = ? w o N z O Z ? I ? a ?- U ?, . ? N - c\,L O U N d 0 V W S O W N =_ Q z w w cl? 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