The URL can be used to link to this page

Home My WebLink AboutNCG020749_Maps_20080603BASIN DETAILS Basin No. 1 Cross -Section (NTS) -- 17 -_ -. 8.- --� _F__ _ Embankment -\ \__� I 11Compacted Earth Dam 8.5• -_ - - 8' long- 15" Dia Cl Mat Cross -Section R r - -- -- - 2 -1. __ 1 - �_ _.-. - _Class B.Eroslon Control Stone --- - , 1 3'MRV. r '�-' 1 - __.I. I n _._I -= _i� =Atilt- _Iflil-mrr'--� _l Note. Pipe thzkness 0052 inches. " _ _�1111111-„ 1 I I MIN. Concrete Anti- Boyancy Detail (Basin No. 1) Plan View Top Reinforcement - " - Plan View ' -- Bosom Reinforcement Side View N. ,i It., Ir,"��a CII, _ b - elie w• 3°pc P ol, 7 I' i e_'��`_� S t p _ _ _ , -_ ,I 1 , t -.� - _ - - _. 13 1 :TRASH RACK Roe@ to_r'etrieve skimmer __1 _1. --- r- - - - 7��7j r. - 2 4�_ � l8"DiaG� ' I � 4 CMP - 1 -- 2" OrificeSkimmer }Mr __7�-rl - ANTI -SEEP COLLAR 5.25• by 5.25• STANDARD FAIRCLOTHE SKIMMER (211) Floatation device 11_ - _ I IL:� f L II. In�ke Anre0n 1II \ I- Outlet pipe u� - Flenpipe � �. _ I III II __- T--. �, - 1 t'_- �, I I �_J111 !'. 11 r � -- Ii Vent, =, 1 I I I, --- - Basin No. 2 Cross -Section (NTS) i 15' - - g' - .-. i '' - I TRASH RACK .' -t `:naryondSp,Bf_._way __ __ f.V _ -_ i' I - 5 If - 2 ,/- m Compacted Earth Data � 2 3 _ 1 - - - - - '- Mat Cross -Section Class B Erosion Cont Stone 36 long-18' Dia CMP ��- - - -- -_�`} -III" !I=11'lllll- l 'I _=1 1 , = 2. -� z _� __� .. � 1 3 MIN. t t ,. %--, : i. 1 _. �ll� _ - - { '- 1= _ , P __.,� T _,. ,, ! 1 =,-I II - -`IIIIIII =-1 ill-lili,li=- III =\ �_ _ - 5 Note: Pipe thickness 0.062 Inches. -1 1--�T __ I -1 I _ 1 11.-. .-_ 24" Die Corigmed CMP f___.�_ I I\ V2" holes on 31centers MIN. ANTI -SEEP COLLAR 6.0 6.0, UT -OFF TRENCH Secondary Earth Spillway Concrete Anti- Boyancy Detail (Basin No. 2) Cross -Section I 31 -.. 1 ,5' ; Plan View _-1. Top Reinforcement - -- - 325 - - Plan View 7' -_I_ - --- 45„ Bottom Reinforcement Side View - 1 rm4 bill i. 11o.4 Car - n '• __: _ 24�xa CtAF - of nTO325' 011 1..r 325 '- ' - n-F l 1��3a 111.1 No.4 bar _ - 6 - 30^U p5 iiOnREl9 e---,--o- -_ L_ -... 5 - i t -- 45 I - 325' _ 45 . . - 325- Silt Fence Specifications MIN. 10 GA LINE WIRES:. - & Sued posts shall be a minimum of 5 R Iarog_ III a minimum,0 13 lh L and have projections to aid in fastening the wire or fabric. Steel posts shall also have a metal plate welded new the bottom such that when the post is driven to the proper depth, the plate will be below the ground level for added stability, 2 Woven Wire Fence shall conform to the requirements of ASTM A 116, Class 1 zinc coating for wire. The fence shall be at least 32 in high and shall have at least 6line (horizontal) wires. Stay (vertical) wires shall be spaced 12 in. apart. The top and bottom wires shall be 10 gage. All other wires shall be 12'. gage. 3. Filter Fabric shall be composed of fibers consisting of long chain synthetic polymers composed of at least 85% by weight of polvolefins, polyesters, or polyamides. The fibers shall be formed into a network such that the filaments or yams retain dimensional stability relative to each other. The filter fabric shall be free of any treatment or coating which might adversely alter its physical properties after installation. The fabric shall be free of defects or Flaws which significantly affect its physical and/or filtering properties. The fabric shall have a minimum width of 36 inches. The filter fabric shall be furnished with suitable wrapping for protection against moisture and extended ultraviolet prior to placement. The filter fabric shall meet the following minimum physical requirements: PROPERTY' _ _ TEST METHOD I R_EQOIRED VALUE_ _ Tensile Strength ASTM D 4632 1 400 Newtons (90i I Elongation ASTM D 4632 i <50°/D - fabric self supporting > 50%- fabric requires woven wire backing_ Apparent Opening Size (ADS)** ASTM D 4751_ 0.94 millimeter (U.S. Sieve #20) I 0 Permitivity ASTM D 4491 1 Sec.' I Ultraviolet Stability (retained ASTM D 4355 1700/. strength. after Sixtus of ultraviolet exposure) - _ 4. A 6 in. x 6 in. trench shall be dug on the upstream side of the silt fence. The silt fence shall line the trench and extend up the posts for the remainder of the fabric width. The trench shall then be tinkfilled and tamped. Silt fence fabrics shall be spliced together only at supporting posts with a minimum of 6 in. of overlap and in such a manner to prevent silt from passing between the two ends, At the time of installation, the fabric will be rejected if it has any defects, deterioration, or other damage incurred during manufacture, transportation, or storage. Legend External Mine Property Lines _. Internal Mine Property Line & Easements Adjacent Property Lines _ _ _ _ 25'Buffer C) Basin/ Pond - ,--, Drainage Feature Dirt Haul Road/ Driveways Structures 37D Existing Topography (10' intervals) , - - Existing Tree Line Rock Outlet Discharge Location 0 Dewatering Pump Location Limits of 10-year Disturbance Existing limits of Beneficial Fill 1, Silt Fence Details a' MANI,UI. xI 0:035-1W------------- ----------=- Proposed Ditch Diti5i:TW6-Slopg M-FluW[DRHon i EARTHWORK SPECIFICATIONS 1 ' / / I 1. Topsoil materials and organic root mat shall be removed in areas requiring cut and fill - - - " y \ I' activities. Store topsoil for later use on the embankment surface. = -, \ L. \, I 2. The dimensions of the Cut -Off trench shown on the drawingare the miniunum. The - ' I \ / , /4 construction. I \ ` -.- \ / \\ y \ �\ Trench shall extent through permeable soils as determined by the Engineer during its - _ _ i� \ / \ 3. Priorto fill placement, the exposed subgrade shall be proof -rolled using a loaded - - 7�'/ Intermittent Stream / tandem axle dump truck or other equiialenuy-loaded construction equipment under the �� \�. observation of the Engineer. Undesirable areas will be undercut and appropriately for fill - " / ? placement = ' / A g ../i / �.1 �, �-�� ' '- 4. On existingslopes of 3:1 H: V or steeper, bench fill into the singed round. \ ; - - P ( ) spa pe @ '.I ) �,�. - - _ - 1• .. qli A -•---- 0 S. All fix shill be compacted e o least ofth of Standard Proctor Maximum Dry Density - - - - - - - - - - - - - - - - - ��. ' / /� - (AS'1'M U-698). The moisture content of the fill soils shall be maintained within -2 to + • __ i \ � / ' 3 percentage points or the optimum moisture contents when compacted in order to _ _ �• _ ' / 430 achieve stable fills with adequate degrees ofoompaetion. � '-'- Exist __ _ _ - - / - -.-'-' _ __, _ frig Mine Permit_Li / ' _ i _- ._- _ _- _ Y� 6 'rife fig loose hit thickness shall not exceed 8 inches. For fill placement laterally --._.. _ � r r 1 widim 2 ft, of the prnnmy spillway pipe, the fill loose lift shall not exceed 6 ruches and _ -' _.__- - y Limits - �„-_-.---.---- __ _ -_ _-_-. - �Iri / Existin r ___ 410 be compacted with hand equipment --- - _ `_._ - -. - _- _ of Benlfleal Fill _ - e II. ) -. _. - -- � . 7.5 . _. _ .- --- __---- _ .. • I . _'� .- - 0 15 30 60 120 180 FEET 7. Each lift of fill shall be tested for density and degree of compaction. Frequency of ------ -'-- - - _ ''--- --- -' ---_ _-..--._.___ _,_ •.� -- �_` - PfOpOSed CirOUndWat2r �V01 MOnitOfl actin for each fill lift will be every _- - �� _ _ _ - - ---- ' -- g ery 2,500 square feet of fill lift placed, but not less than - - - __ - _ - - -- - - - _ _ (See Groundwater Monitoring Re ' e nts) two test per lift. .. --- ---- -- __ .. - - -----_ -- �''" SCALE 1 60 0 -- -- _ 8. The fill shall consist of CL, MIL and SC soil types in accordance with the Unified Soil I II I - _, - - - - Classification System SC soil types shall have at least 35 passing the No. 2000 sieve r I - --' - - - _ - - - f .� . ' \ -''�_ __ \ �, Stone Filter Outle size Benifical F'iII�I I ----- -t---- _� � , .: \- \� - ,.,. , .� l - - - - - - - - Stoae FilteLoutlet // \ \ ` ` •, � l � CAST IN -PLACE CONCRETE I - - -- 1 -A, �' - - - - - - __ - - _4,7Z, / \ \ \ \ \ �I c tleU Discharge Loaction Thump 1. Cast-ar lace concrete for the anti -buoyancy block shall have a minimum 28-day 1I I I '` ;,� y = �/- \ •�.� - \ -� �q+�-�, \ ,� .�, compressive strength of 3000 psi. l'he coracle shall have an air content betwecm 4°/ �'• �• �' ; \ - - - ` \ \11 I I \ . '.,� \. �G \ and 64ro by volume mid a stump between 3 and 5 inches when poised. II I i "I',, , \ \ \ '". \ - � �U� \ 420 ,\ 2, Steel reinforcement shall conform m ASTM A•615, Deformed add Plain Billet Steel I >< ,` i \ \ aCJ\ '' ,� P g Stone Filter Outlet II I / / \'� \ \ a1� - . Dewatering Pump LocBt on "I.,•, \ Bars far Concrete Reinforcing. 60. I \ � PRIMARY SPILLWAY I I Q� �\ ati �� \ \ ` \ ,` \ L Conduit pipe shall have a minimum thickness of 0.052 inches with 2 2/3-inch by 1- I I Q� srrR � `, . z• ' I '� -\ inch corrugations. The pipe composed of Galvanized Coated Steel per ASTM A-796 and Existing i \ \ \ \ . \,,; \. \ �. I I I 9777365535 elf\ \ ASTM B-790 or Aluminum per ASTM B-7444 and ASTM B-745. Mine Permit II I I _' \ \ \ \ 11 \' \\ ' � 2. Pipe Couplings shall have standard O-rings (ASTM D-1056) with semi-compaated ' I E R R I TT L E LA LOUR j _ ` \ \� ., -� �. d ' \ `, Limits � \ . sleeves. 4 1 126 NORTH VALLEY DRIVE ;�'••,, ` /s \ I 1l. � LOUISBURG NC 27549 0�.;'�.,,i ,\\� � `\ . I l ]I v / Erosion Control Structure Schedule. ;,\ , �� c°r /� } � /� n e �.. v � A � -Watershed Basta Dimensions Storage Vol., cu. ft.� I `� •,1 x , ,, /'1CLIVe M I ne v v v \ ��-' .`•\ i Structure Q10, cfs 025, cfs Area, acre At Top Of Riser Level At Top O_f Riser Level I \, I 1.. \'\ � I �__I I I \•`,, \ \ \ ' �, \ _\_ �N� \ / No. 1 (Initial) fi1.1 _ i1f .2 0.52 28 ft. By 58 ft. -. 4,044 � `. \ 1 I 1 ; ---'t --- � \� \ \ \ > \ \ ` \ \ � ' �� \\• S/A / No. 1 (Final) 9.1 10A - 3.46 I -- 45 ft. By 90 ft. 12,192 ` N II '1 I I � r1 \ \ \ L - No. 2 22.3 24.5 20.3 70 ft. By140 ft. 32,796 - \ 7 - I I - \ _ \ \ -- ` `., `� l 460 (1) Pump Discharge Rate Controls at 2.23 cfs. ', 'p �I I I I s\% � - -_ - _v w v v `, i 1 I --- 1 -_ faunal Parcel dine' , • `I\ \ ` \ \ \,. Trash Rack Details +�-- v v� -- 11 II �p� - _ I,�I I� - �. v v ti q _� r N v v. N1 a /. ',� � Perspective View cV� I� i� I _ - I--. �! yv \''' , v � ��, v ,i-1 � K '� v� �'. I vv �v a .-1---6ton Filte 1 `\ \ �._. �- •-•��-~� i.- Top Grate Consists of 1/2" Metal Bars .____ II I ' \ \ •� \ �I— y On 6" centers each way - _-. i I I I \ .. \ d" � " --- - _- 1 ^ \ \ \ �• I \ �' \ - I i I \ �\ N. \' , I v 0 I _ I \ \ \ 1 I �t ;� 47 Note: A lgle iron welded to vortex plate -I .Support Bar I 1 I \ i/ , ` \ � n with metal bolt conected to riser Stone Filter Outlet --- I I I I I I , � i t '1 � \ \ ` � \ r 0 / i �'I/S -- ,�_ \ /V''I 1r% t I I I \ I Side View = s I_ r - I _I, \ -\ -- - - 9 r I -I - _ 11 III) r- - D1 ---, \� `11 j S�� No1.2' \ `\ °�� ' l \\\ 1 \\'\ 'I41'A` \ \�4;01 ? _ ., "Ilil - I 1 �-- % I i ___ \� I490 ;� i i I I I "U � N I 1 - I � i 12" �; � I I , I - _-. _._. Support Bar Basin DI D, I I I--..\ \\ - ,_��} - 1 Ir/ ^� (#6 Rebar minimum) _ \ __ I. _ . / I I I I _I v`NIIIII. _ 1put n / I I � - - _ - -- I = 4 1 _ 80 -- 24 -'--'-'-'-'- / - '� �I i I ; - 11 / ; -o / / / / _ y i D n n i i / / EQui meats inO A/es / //�� i i'� 1 \ t= �/, / 2 2 24 30 II b, r / P / r" `x' % �'- - -.--< i 4s6 ti I \ i 411 �` �'co Riser 1 `•••} / / rD / / / �__ \ .i.� .ice ''•, `. /' / �. < i I'' v ',. II: '� ' � !__ _4$8 -T 4N, - - _`_ _ l i 1 1 1 I)-w i (CG - � i I, ice' / _ _ - --- . �_•r. _,, _- .-- ` �p2,:. "' oo ns PII / Pipe Outlet Stone Section �,' , /i / �� --___, _�__; _ ';I `;'� / �t W chD�b' •e ' --.: III ! � ,i ---- -_--- \ ', P°ti `�G \ ; ; , � �. \ ' , ' / - I.-- -- I �t x475.5- - 490 a�J ppu- _ _ Top View of Mat i l '•--- == .... -- - - r '� - - - - - - - - SAI 6c a - / '��l ------- I kpil I ; " :: Met Cmss•Secuon _-.'-'_..... -_-______-- _- _ .� _ _ - _ 41 ,e T= 22' Class B Erosion Control Stone ".'I ----"- ----j-•- 5•- _ _ •----------- - - -- _ - 6. .- - 500 , �,p?,: 0 _ t F -tr-22s - + __ _ __: _ �' 9777367019 a� , �Q % II t , - -�- ;. - 8-ft/fr + - , - - --- 0-�ft------------- --- --- / t`. /.5 c' O O O F filer Fabric "= - ( _ __ _ t--�� __ __ - ` - - ?.• J 'LG ' t -L_ _.. U,�.., ,i. u.6-r9�'r3-�TO ac»�4 , ,. I- \,`�- G •O 1 J G O C C O C o o ., ' I. La I � ., M I'w\' //� --- - --"----' /�.7 - ` I GOOC 00 O00000OOJ Do - i y Ditch �1 \o. L � __ �' �/s!' � \ ('ry �-'F 26 NORTH VOLLEY DRIV o:o000CGGooOcoGG`1 .- \I 1, ,. N -nil. ` l I�% / LOUISBURG NC,27549 i � �e / II\ \ f _ _____ Wci CLASS B / ROL STONE I \ r r r r Outlet Schedule \ 1 - Culwrt Do Location Do, ft. 1 La, ft W, ft. I'I I ' X r 11 •\\ ,\ - - CONT ON I - / O1'1 Do BASIIN NO. 2 11 5 14 15.5.25 12 5 \; \ ` ' . - \ / :� iGat •\ ,\ ;':� \ / i I III, Id buildingit S of /• �`_ `� - _ 1'� Former Brick Foundation Maint /- . �• • - � -._.' Concrete S Pad •� . el / We 25 Unexcavated Buffer Netting Details 440 - _ r 1:1Gro d er Monitoring Requirements -------- - - - - 9s oad -.: - - -_ - ._.� - Ace . ______••- _ _ - �_ Residence II groundwater monitoring well. Well shall be installed . : � - - / 1 Instil 9 _�450 �'"--- _constructed ; - I ' standards se o in / / to he stands d Well forth The NICAC 102C 0108 r-wscr..>taw,.w.tenaa;oN.e.aseuor°ri..*per _ �� ,` - _ _ XlStln-�-:..____--L -T__ � _ Pro vim' 2. Water level measurement event shall be collected duringthe months of Permit Limi - . .dr- a , a¢ , DAL1 ,,, ------ ° o _ I 1 L►ne _ ___ _ August and February. Water level measurements shall be collected n - : fir - - • �_ O1 I - ;te _ at the monitoring well, at the base of the mine, and estimated along -, i I / \ -- ;, i III 1,I _ `_. -_-___ 10 - . I , sidewall of the excavation. Relative elevations at each location shall be I'I, I --______ It --------------''t - _, _ /� determined to evaluate the drawdown curve of the groundwater table. I--.-------- il ------ - I - III '.� Y 0,hi IYCor" II, ,r WE, . ipOPK 1" ipEHGi SECTION VIEW I 3. The collected information shall be provided to the v. __.- \' Water Quality Section within 30 days of the measurement, and "°'�"�i"'fi °"" - - - --- - / in a file at the mine office for, a period of 5 years PERSPECTIVE VIEW Netting Installation Specifications. 1. Start the laying of net from the top of the upstream end of the channel and unroll it downgrade. Do NOT stretch netting. 2. Bury the upslope end and staple the net every 12" across the top end, every 3 feet around the edges and across the net so that the straw is held closely against the soil. Do NOT stretch the netting when stapling. 3. Netting strips should be joined together along the sides with a 3" overlap and stapled together. 4. To join ends of stripps, insert the new roll of net in a trench as with upslope, end and overlapit IS" with the previously laid upper roll. Turn under 6" of the 18" overlap and staple even 12" across the end. A . _25' i. Undisturbed _ -_ Buffer _2 1 PERSPECTIVE VIEW Y _ SYNTHETIC LINER DETAILS BEGINNING CHANNEL TRENCHING ANCHORING. �� - SIDE SEAM OVERLAP -u=sTREAM,DDwrtsTREAMovERLAe / BEGINNING CHANNEL TRENCH ANCHORING Proposed Ditch with Temporary `. I .. �, � Cross -Section A -A' (NTS) 2 1 - Benifical Fill Ditch f „f-`- ---__ Mine Excavation Floor ' a - - - ---------- - ---- --------- Ditch Straw and Net Lining ��_ - "__� ------- _______________________------------ _ ... _. I > = / Stone Filter Outlet / I I Proposed Ditch with Synthetic Lining Proposed Ditch with CLASS B\ NOTES: ,_ \_` s•� (./ Concrete STAPLE PATTERNS ARE DEPENDENT ON SITE CONDITIONS. STONE or Concrete of Similar Size SEE RECYCLEX STAPLE PATTERN GUIDE FOR DETAILS. SIDE SEAM OVER LAP Existing Topography (10' Intervals) _ 2"A"Over Lap Proposed Topography (10' Intervals) 1 Proposed Proposed Sediment Basin I !► _ STAPLES ARE THROUGH BOTH LAYERS Proposed Silt Fence CHANNEL TERMINATION ANCHORING 2 ROWS OF STAPLES 4" APART, STAGGERED, 6" O.C., STAPLES TO BE PLACED CLOSE TO EDGE FLOW OF LAYER 11 �;,._ �> • I� i' TRENCH APPROX. SOIL PILE ��1-- 10" WIDE x 8" DEEP FROM TRENCH - _ FLOW I_ I - ' � - _ _ _ --- CHANNEL TERMINATION ANCHORING � _- -- ... ...- UPSTREAM/DOWNSTREAM OVERLAP 6" OVERLAP UPSLOPE LAYER PE LAYER OVERLAPS SHINGLE AFFECT A ;- -- FLOW _ _... - kk 2 ROWS OF STAPLES 4" APART, STAGGERED, 6" O.C. '=' - 1 ROW OF STAPLES, n 1 2 � 2 ROWS OF STAPLES, STAGGERED, 6" O.C., EA. DIR. STEP 1_ 2 ROWS OF STAPLES 4" APART, STAGGERED, r-6" O.C., STAPLES TO BE PLACED CLOSE TO EDGE OF TRM FLOW '•----I SOIL FILLED f 1 FROM SOIL PILE, ICOMPACT WITH FOOT STEP 2 / / 490 25' 1 Unexcavated - Buffer 1' A' mIN c JE J d iE °Ira as i I I Road I 60' Easement ___ _ _ ,-- TYPICAL DITCH DETAILS (NTS) t 4 ems; 1 75' Min,' , J T.:� 10 Ditch No. 2 Mulch and Netting 5L Ditch No. 1 or Synthetic Liner i I I 4 1- I 4 _ P -\, I 1.75' Mini 1 �f _ is -. i �: _ 22 _: _ Filter Fabric I _ 10' Ditch * 2 --- II Class B Erosion Control Stone 1 5 Ditch 14o. 1 or Concrete portions of similar size 500 4. Should the groundwater drawdown curve indicate an impact to the adjacent unnamed stream, assessment of the impact and proposed modifications to the mine dewatering activity shall be provided to the Water Quality Section within 30 days of the last water level measurement. Erosion Control Sequence and Reclamation Considerations 1. Reconstruct Basin No. I with installation of the pipe conduit system and Faircloth Skimmer. 2. Continue mining to the east and north with beneficial fill placed for reclamation of the mine. Final beneficial fill slopes shall be 2:1 (H:V) or flatter. 3. Increase Basin No. I surface area when benficial fill area covers the north side of the mine. 4. Add Basin No. 2 and silt fence as needed with the progression of beneficial fill placement. 5. ConstrUCt di\ ersion berms upslope of beneficial till. ---6» Retnua ohaul s de. area -flat except at de office area near the entrance of the mine. Pbad and parking will remain in place at this location. 7. Re -vegetate the ground per the existing mine permit requirements. 8. Once ground cover is established, remove basins and silt fence and ro-vegetate area. Maintenance Plan 1. All erosion and sediment control practices shall be checked for stability and operation following every runoff -producing rainfall, but in no case less than once weekly, Any needed repairs will be made immediately to maintain all practices as designed. 2. Sediment will be removed from the basins when accumulation is 2 ft. 3. Check Faircloth Skimmer for any defects and repair as needed. If skimmer is imbedded in the sediment, pull skimmer from the sediment and allow the skimmer to rest on top of the sediment surface. 4. At Basin No. 2, remove and replace stone filter when stone is clogged with fine sediment. 5. Check silt fence for any failure and repair as needed. li- ll I .INR. r �'� - I- - _ _ y �, EARTHWORK SPECIFICATIONS �, i 1. Topsoil materials and organic root mat shall be removed in areas requiring cut and fill __ - - \ L E Z0P1-_�r�:.______- �\ BASIN DETAILS 4 activities. Store topsoil for later use on the embarkment surface. � ' / -., ' J 2 The dimensions of the Cut -Off trench shown on the drawing are the minimum. 'the _ _ jj ;' Trench shall extort through permeable soils as determined by the Engineer during its a Basin No. 1 Cross -Section (NTS) construction. I \ F�'-7 Intermitten_t Stream � �/ / /__ 3. Prior to fill placement, the exposed subgrade shall be proof -rolled using a loaded -�� _ - ' " I �i I i - II tandem axle dam track or other uivalend •Loaded construction equipment under the _ = - ` i _ - -- --- - -- --- -- - -I S observation of the Engineer. Undesirable areas will tie undercut and appropriately for fill / _ s in'i-. iiii i \ y t 11 17, 81 L, placement. \ .. '.i• _,/�._ .-.. _. _. _, _,_ 'TRASH RACK � I � i.i' .�._._ _ _ _� � / �� I Rope to re eve skimmer 4.On existing slopes of 3:1 (H: V) or steeper, beach fill into the sloped ground. A ,I / I � ;_ / i % �TI• i -- ,. - ---T- _ I 5. All fill shall be compacted to at least 95% of Standard Proctor Maximum Dry Density 1 __ \' Embankment �� •--' -.-_.. , III (ASTM D-698). The moisture content of the fill soils shall be maintained within -2 to + \ 17 ,---\ % 2 = ' , / -�� - -.--- _- --_-- _ - achieve stable fills adequate degrees ocompaction. hen compacted m order to ... - - _ �_ - ,� . -_- _ • _. _. __ ___"_ �In - Per•�y•i� _ _ /III I -_. / Compacted Eardr Dam �I ) �-_: 1 I I - P th8 Po P .---------_-_.------'-- _-�.-_-- _-_._-._..__�T_ns_.- .""'ram.-` XIS -- ----- -_ I I_- --- _ _ /itM8.5' - 118'UinCHIP , _...-----'._''-'-'_ -��-_-- -._ �._ .mlt4' ��6. The fill loose lift thickness shall not exceed 8 inches. For fill placement laterally --.----- _ _r� - •- .-__-. - ____ _ - I _"- 7 Linlit$ Of B - - - �- __ - ----_ _-- --` _- 0 515 30 60 120 180 FEET '�-.- __ - _-- within 2 R of printery spillway pipe, the fill louse Ifft shall not exceed 6 n,ches and -_._ .. _ ' __, -- - __..__-ExI$ti n -- - - - -- _ -4 � Q ,.'' -_,> enlfical Fill - -- - - - --- -Pro osed Groundwater evel Monitori ■ 38 long-15 Die \ t - - - .-__'_ ��. --. __ __. _ - ----- - -_ --- - -- - Groundwater nil n ) Mat Cross-Sectio° -_--_- - :.-_ - -- rl -- -- _.----._...--- ------ .-----_ - ----- - __.__---.__. -' _.._._ - -'- ______ ' - (See ater Monitoring oning Re ' e is 1 _- _-.- -.. ,. ;-- - -- ---I II--- 7. Each lift ofFdl shall be tested for density and de ee of compactton. Frequency of `- -__--.__.____..,_.-..._ _---.-------. ...----..-___ ____. _- ------- --_-_ __._ ' .:-__---- _.__...__._ - ._ r> 2 I z II - _= II s SCALE. 1 = 60 0 - - _ _- - ._.__-.. �� Mlfi. -.__ -_-.. I_-. ._ -. - '- I �:-: --- 3 n ... --.:' ' -.- fill lift will be every ' 2 500 square feet of fill lift laced, but not less than -- - _.--.____- - --._- --_-- _ - _ �� r -v . Class Coniro Stooe ,-. --_ - I � t .,-- -.. 1 -. testing cry q P - �-----..__._---- � ------.,..-___._-.__ .._,_-._..__ _...__ .._---.___- - - _ _._._.-_-_ - � - - -_ - _ ---ti �-- .." I _--ill I- `T T;Tr 11111---111.1T 11'I--- -_.. I II I _;1 _7 r11�1 �I',- ='1 iwotest per lift. ___ _.._ -,L.._ _ - s.�- �� \ \ -. 11--- I hill---'- Note. Pipe thickness 0.052 inches. 11 IIII IIII- 1 1�-I1' ____ ------ "'-- n = I, I - _ -- stone FIN IIII - I III III 111 - ---- _.:---�"----'" , \ \ S Filter Outle \_ 8. The Fill shall consist of CL, MI. and SC soil types in accordance with the Unified Soil I - -' -' - - -- - -_ ._ - _ - - \ \ \ \ \ �__N � ANTI -SEEP Mtx. Classification System. SC sail types shall have at least 35 passing the No. 2000 sieve I - �. \ \ COLLAR 525' by 5.25' • ■ __. - __ _ - _. �. .-, _IN -\ ,` \ - �, \ \ i - - _ CUT-OFF TRENCH I -.-. - StGnsifitte�0utlet-- - . - �.. _ � V V A \ \ V,�.... LPO 1 ' , CAST IN -PLACE CONCRETE B e n if i ca I i I �' I ; ", - - _--_ _-- ._- __ .. _ _ - �= �� .� � \ \ ,, \< 11, \ \ \ \ \ �� c. fief/ Disch9rge Loaction fpl''Pump ��.\ ,L, , / Il. C:ast-in jnkact orinatfee Far die amn-buoyanry block shall hall a muom®om®2d-a&¢5' �,, '11,, ) - \ \ yt, _. _ --. compressive strength of 3000 psi. The concrete shall have an air content between 4% I i �; i 50 and 6%by volume and a slump between 3 and 5 inches when poured. �� I - / A \ A A A .-� A-v.... A 4r, V� - � II. 11. 2. Steel reinforcement shall conform CO ASTM A-615. Deformed and Plain Billet Steel Stone Filter Outlet I 1 ,' � V yley v�DewaY. ing PUlT1p LOC�t'O'n� ,, \' � l 1 STANDARD FAIRCLOTHE SKIMMER I g 1 q I I -, I•,,` - .Aon� O v ,v � v Bars for Concrete Reinforcing, Grade 60. -. \ - Q -- \ Concrete Anti- Boyancy Detail (Basin No. ) _` \ \ I v , v 1 '� PRTMARY SPILLWAY - Floatation device 'I I I I _ ,f a1 \`� \ \ \ ,. _ _ 1. Conduit pipe shall have a minimum thickness of (1,052 inrkes with 2 2/3-inch by t- E x I Stl n g I I I i e - �O`�c \ \\ \ `\ \ ,' V. \ \ : \ �7 �\ �, \ \ \ Plan View I - inch corrugations. The pipe composed of Galvanized Coated Steel per ASTM A-796 and 1 -< ' - Qi _ \'._ �, \ -\. Top Rein,orcemnn, 9777365535 ' ` ` �'2) N \ I , � \ Mine Permit 1I %\ '" Plan View , y \, - - ASTM B•790 ur Aluminum per ASTM B-7444 and ASTM B-745. ERRITT LE \ View .. .. I `� -l1• i n file Vi , - Bottom Reinforcement S i \ \ - 1 I - -. - 2. Pi Cou lm shall have standard O•nn s ASTM D-10,56) with stint-comtaated LI m its I! >;` \ \'� �- - ,e"'aecmp 1 P g ( I 1 126 NORTH VALLEY DRIVE \\ \ \ !A mo n•� Intake screen I Outlet pipe Flex p, a sleeves. I \ \ \ \ \ \ \\ \\ 11. IV L() IV " R 75 one - i/ J ILOUISBU G NC,2 49 y' _-- -- - �Y/ /�/_-- - -_ -_-. I I \ \-- -- -- - v v v < < v ��• �r,A.m _ _--fJ, _ . .: ',.. ' 21 -i-i e--+-..------ro, I I _ I, I `..� �� V A ,� - A A A V A V A `,,� '`.,: -'•, �. ��! 'N I 2. - j Erosion Control Structure Schedule ACtIVe Mlne v y v v v v v v' �'�� ` �� .. -- - v-I v; vvv <v v j �� v y ;, I - - -- -- - T - Storage VoL: cu. ft. � - - - - v �/ A v v - V :!I Q25, cfs Watershed` Basin Dimensions a9 " f I .., '..V v v �_r - V y v ,�� .\ �S ''� `,. / Ti Structure Q10, cfs I Area acre 1 At Top Of Riser Level I At Top Of Riser Levetl \ / / ' l , I � \ T 1 - -___ - ~fro - ----- \ , /,II' I ; I ,_ \ \< \ ,�,____- No. 1 (Initial) 1.1 1 2 0.52 28 ft. By 58 ft. 4,044 __..._ \, L- , . \. \ \\ \ \ _ - \ ---- - \ \ \ 'T ' _.. -- -...--I -------� -- N I I ,, . I 1 - - _-- -,�---- - - No, 1 (Final) 9.1 __ �10_1 I ... 3.40 45 ft. By 90 ft. - -_ -- 12,192 __- - I \, I \ _ 9 -- - - - I v, v i \ 46 No. 2 22.3 24.5 20.3 70 ft. Byl40 ft. 32,796 � I I -_ - - _ , __ %;' i v < vv > � \ In I I \ O \ i \ \�� \ \ -- l \ \ i 4 (1) Pump Discharge Rate Controls at 2.23 cfs. II, '� \ \ <\ `�--�-- \ \ \ \ \ \ \ \\ \ \ \ \ \\ � '/�i A I I O _ v v v � v v v +� ,., 1' 11 �, ,� v v v v v v v v v v ; I I I 11 -_ - - -- ---- -- -- -- -+- -- -- - - - - _ - to _ I i l fib, '' , \ \ \ \ \ - - \ / - --- IQ 6mal Parcel Line \ - - \�, °� Trash Rack Details -- - - - - - I I / " v ` v v � � � < v v v v , 1, 1 a;a ; � c y v -N = v v y' " I �� I I I / A �� '?� .- - \ V \ \ / e / V 1 -Section NTS I I I _-_. _._. - �. 1. /III n Basin No. 2 Cr (NTS) Perspective View 1 / \ , �\ `\ / v < v. v v /I x s+ / -- ton Fill ` / Top Grate Consists of 1/2" Metal Bars - I \ \ \ cl V A A < / A A _ / -� \ 11, - - -- I' On 6" centers each -- -(, I I I I I �� ! ! 4 �� v -•�y. '',I.1 / 470 s B. -- is - I �, �" v '/� -t v < v v v v ,TRASH RACK _ I v v / ! I , ! 1 ", �, ,\ / ��"�S v -, - A� \ 2 Support Bar I I I � / \ \ /2 t �, A Note: Angle iron welded to vortex late P-P ___ I \ \ . �,, '� , < \ \ , 1+�" tj 1 ��/2 I v = - I -.--Stone Filter Outlet 1 I I ' v v. V y i t - v v v , &/ gA I with metal bolt conected to user _ �r - \ \ Q, @r r , -- 1 I , I \ o,,, \\\ i c ,'' orb *� 1 ^�j, 2 _ __ , 3 ' Side View ' - I ' „ f� r- T � �_ t I I ",� t, �Q� v� v ,42� I i I I d t 111 _ I I IIV D I I S� of ''P /% 1 I Ip I l �i a/ 4(/ I - - - �'� % I I �� _ . / , I I I � _ - --- �� g I �� - ... - -- _ -_- --- „ :�, I - - - s - -- / �,,.:. = - :�, ��1 I � I -�-- -�1 cal ; /.� :.:.- '��+r 3a long-is"Die cores ,...,. rt. .w. t'. �;--I 2 N; I I I _ _- - 'a'' \\ I - ------.._-. __._-..J I- t% CG R 1 by 1 \ __•,A -= Mat Cross -Section - T -- -\-' - - t -- - - - 2 I _ -- - 2 F,i-1T - - _ �_ - - -1 / - , , --- - - - _- _ i, 11 I _ R.--- -- - -- t l - .r -_III -- I I - I i I - J I I I l: s B Erosion Control Stone - -1 l I 3 M N. I� - -, \ a ; , \ -Cos III --- 1 III : ',11- -> ------ D ; } I I - - - \ , I � I J I- -1 \ D - i : '"' 4;36 - - i I111 I Basin - - - - TrF'T-_. II�-_- \, 24'Dta Conyated C!41P \. Support Bar 7 I I _ _ - - 1 1 r,, I q' \, \, I i I I ;.. --1111111= ___- 1 Note Pipe tni kneaa o osz inenee -11 I' \ (#6 Reber mtmmum) /' I \ •, "w, __ __ \\ 112"holes on 3"centers e= - 1p11 2411 ---,._ '� '' , / / / I I :�- --_\ --`__- - \ \'. _-_-� - - �' / i {V1 - 1 - _'_' /./ , i � /� / 1. 2.0 ANTI -SEEP I I 4 - -. ... - --_- " n I M[ COLLAR 6.0 by 6.n I '� t I Eqal me S ® 9 i V � \-..�.►,_`4-, t. �.- ` •r-"-.--'1>1 v �. CUT-OFF TRENCH 1 D 11 11 i' I I I I _ \ \ \ i\� I i}"�� _-_.__ ____.- __-__. _" 2 Riser II T -. _ l L, T \ /.� :�./ i I\ -ram-- i i / C \ � � , ;cs>' 'i Secondary Earth Spillway `� - - I _ I - __ _ r�J y / / i �'Ltj -- -- Cross-Section - i .r �'` -- Wood br ile , - il Basin No. 2 Is Concrete Anti- Boyancy Deta ( ) 1 , I , ; r_ oil 9� ,L- k - let Stone Section o Pipe Out / - sA - - I ' � - Pox - -- i • ,IQ 1.r� '- ail e . --- S -Stockpile -p'il- • tuck V �.f Plan View S. - - - - - - To View of Mat --` _ f Reinforcement P I. _-- - \ r�+r 506 5 TOP -- 7 1. Mat Class -Seaton �l ___.__------___- - -__ _-,. I - - ----- - _-_ _-.-' __. ------ ---------- --- ------'-- '-_--- - - ___- - - - L1L• ) 9777367019 Q --- 3.2a Plan View --- ------ - - -- .. .. r ment Stile View ..., „ 00 - - --- - - - t r, . -.. .. Bottom Relnfo ce T= 22" Class B..Erosion Control"Stone, _ La -- 9- tr.��5 rat_- _:, --- Q_frir ' / ELA LOU J �o r, as �'1 _-__.. _ _ _. _.__ -_ _ _ -. _ _ I� - - FiltnrFabrie 1 o-�2 ---- ---- R NORTH VALLEY DRIVE �� r -- 7. ME _ - 126 NO /�� (/ . -, N0.4 Mr .�3'�ia_ChdP I UCA �- _ , _ , . y`° Y If .. _ i Me. b bar e, _---Riser Pipe- -:=-o, . - - O � C C 'J' O. 30 cJ e' Ef.O 0 0 ,., _ - - 1 , / _ - -- - " i La �I �ItCi1 4. 2 ; LOUISBURG N 75 � �5 24" Dig. CMP -� .:. � " 1 -- t s _ .- � �O V 0 0 0 O'G-^ O O O O O O O V� - 1 3" a 25 ', _,, l� " �_ - a" - . - '� 171 0 O J O n O O .. O O O O - pp t r a� G J 000000 G V O V-.l ' ' Riser Rpe - sae' I' - '. I_ -. N. 4 w �J O C V C r,) O J O C O �- t i _- a cocc ,�u:;o - �\ '' y�.',, :I 3ooe PelCnncreta . '.� W � C V e c, O O r, r V O ,r I ,( -Outlet Schedule .. _- _-- �� t\ ,% t V - _..._--_.. - - � _.. -_.� :/ •�,� lfA' o o----a __ CLASS B EROSION ° calm �Ix Location - Do ft _ La,_ft _ W, ft. `. t�- 11 V ►, R � / O � ::.. s" oGn CONTROL STONE �o� FiASIN NO. 1 1.25 12 13.25' - � �% i _ _ 3.. - _ _ as a.zs- 4 o,t o: ooc c11 c - -- - �\ \\ R / \,� - t -� aa �'o 0o'0o�o0oc��ccoo c r>a [BA8INN62 1.5�14 15.5 t N. A _ �7at 0000cco Cooc0000J� �• I ��'/ 1 o , -, , o c o o o o � � � I ��f 4emalns of � - i 0 o C C Cl 2R�= V �' old ' r' s' � ,. building \ -- •� i ,, _ /' _ \ •�. I /' Maint� i _' �,� Foimer Brick Foundation Concrete Pad -- _ ___ � ---_,e '',..,,\ shed / 9 / / 490 - _ well Gro dwaiter Monitoring Requirements \ ` - �.,__25' UneXCavated Buffer 1 Ins I rroundwater monitoring well. Well shall be installed Silt Fence Details 4 _Aces -`- : - Residence g Netting I n Details l I s = --_ _ Residence g 40 �._, Road - / NCL Licensed Well Drill. The well shall be constructed to Silt Fence Specifications a MAXtML M _ _ _ -_ _ _ -�-. _ - - - - ,; b11N10 GA. --- -'- - - - Minimum l?-1!2Qr�euge lntennadiate wrt2s _ L C $se d n - _ ... ( i61-40ircomE 00 lineVo ii:�- I -'-_--__-_ __ ; --. �, - I _ --- _. LINEwtRES`:----_-----_ _ _ -•---aE_ _-_ _._ � i � fiu+4'le staot�fia d if forth i 15A NGAG 02G 0108 'nimtun of S R. ton weigh a minimlan of 1 i Ib/ft, and "' - - I -- _ T 2 _ ___ tl Water level measurement event shall be collected during the months of 1, steel posts shall be a mi g, g .. -. _.. l I� ✓,'i;:' (1-------- - --_- -- _ _ _--- - EXIStIn Per1111t LII1lItS� Pr �-��• eta shall also -. �, � ,;,�• <_ �<,,, ,- ;; Tempura, tw°, Isvo .i, i.i,testa,°ri°w wim Piesnc °e,arcNrninsl Rn0 °uA altlPa °r°eai„B parNid opert Li - .- � � f-�-- August and February. Water level measurements shall collected have projections to aid m fastening the wire or fabric. Steel posts , y, , `„ a � ,{: y, _` F • "I �... �_ - _ - have a metal plate welded hear the bottom such that when the post is driven �?F --- - ''-' ��' ��--_..____ I , r3cp__°rrFre now ----_---- �o L-_�.�.� �� Y ne 'me�,o �-� Gate �• � a� � ��- ntFenceFabnc R�ti - r r�.,: a` ,'� / �•' � � ,� � -- - _ � �, O Ern �'� - '; at the monitoring well at the base of the mine and estimated along to the proper depth, the plate will be below the ground level for added stability. `, _- ___-_--_-.- A -I - -__ ` - � e <zx a w fr to -= �;, �� „� , , __ sidewall of the excavation Relative elevations at each location shall b x - ? z `: .� e the raw own curve o h groundwater table. 2. Woven Wire Fence shall conform to the requirements of ASTM A 116, �-- - fr ,` 11' determined t0 evaluate F II, I--11 II - III �I'I-. --' L_-'I'I_ 1.=�Irl l I_ etih,Zz,, m,' .. III - --- _ Class I zinc coating for wire. The fence shall be at least 32 in. high and shall ,T - _ b _ 3 have at least 61ine (horizontal) wires. Stay (vertical) wires shall be spaced ri it ,. �� x .f �� - - - - ' � d � d I li d d ft e I ? - h2i at leasapart Throe(The and ntal) wires Stay shall be (vertical) wires ssAll otherwpacedires shall °I`tGENeE L =z ;Y x Y y- 1a The collected information shall be provided to the ,i � rf x'i s I_ - r�� , „ '' Water Quality Section within 30 days of the measurement, and be l2Y gage. ,I I L11 _11 -.------...-.-.--�-- ; �, , t •µ � , -_-- ------ �' in a file at the mine office for a period of 5 years. 3. Filter Fabric shall be composed of fibers consisting of long chain synthetic T I�_II .Steel Post Woven Wire Fabric o - polyesters, or .. polymers composed of at least BS /o by weight of polyolefins, po yes _��.0 � _- polyamides. The fibers shall be formed into a network such that the filaments S It Fenc or yams retain dimensional stability relative to each other. The filter fabric shall e - be free of any treatment or coating which might adversely alter its physical properties after installation. The fabric shall be free of defects or flaws which 3- - O" significantly affect its physical and/or filtering properties. The fabric shall have I 26" a minimum width of 36 inches. The filter fabric shall be furnished with suitable wrapping for protection against _ ; .Crdg moisture and extended ultraviolet prior to placement. - ", illy IIII _ \ -6" Minim The filter fabric shall meet the following minimum physical requirements: _ 2,-0„ ---- -- - - PROPERTY• __ TEST METHOD REQUIRED VALUE 1- I rTensile Siren th ASTM D 4632 400 Newtons(90IbJ " � �� I11 IIz . _Elongation ASTM D 4632 } <50% fabric self supporting I,I __--° _-_ - > 50%- fabric requires woven , -- _iI wire backin _ _--_-_Pp iyp = g ( I; -A -- __o�_i-Ll ,. Uhruvmlet Stability (retained ASTM D 4355 -_70 Sec _ A Arent y emu Stze AOS �TM D 4751 0.84 millimeter(U.S.Sieve 420) - strength after 500hrs of ultraviolet exposure} - _L- _--__ _l , 4. A 61n. x 6 in, trench shall be dug on the upstream side of the silt fence, The silt fence shall line the trench and extend up the posts for the remainder of the fabric width. The trench shall then be backfilled and tamped. Silt fence fabrics shall be spliced together only at supporting posts with a minimum of 6 in. of overlap and in such a manner to prevent silt from passing between the two ends. At the time of installation, the t'abric will be rejected if it has any defects, deterioration, or other damage incurred during manufacture, transportation, or storage. - ---- -- -- ----- -_. Legend External Mine Property Lines Internal Mine Property Line & Easements _ _ Adjacent Property Lines - 25' Buffer I) Basin/ Pond / . � Drainage Feature -• Dirt Haul Road/ Driveways ----__-_-____-- Structures 370 Existing Topography (10' intervals) Existing Tree Line Rock Outlet Discharge Location Dewatering Pump Location Limits of 10-year Disturbance Existing limits of Beneficial Fill n; i _ tom ,. r2. 1 ,- I ' �_-tip Cross -Section A -A' (NTS) , A.d 11',I I A A. VVtp 1s�mWwecWP'^8 PERSPECTIVE VIEW �- J E Netting Installation Specifications. a E - - - / - _ . Start the laying of net from the top of the upstream end of the channel and a` n. _-- - - I unroll it downgrade. Do NOT stretch netting. 1 2- 2. Bury the upslope end and staple the net every 12" across the top end, every 1 I 3 feet around the edges and across the net so that the straw is held closely 1. against the soil. Do NOT stretch the netting when stapling. i B e n if i ca l Fill 3 Netting strips should be joined together along the sides with a 3" overlap I and stapled together. - - 4. To�Ioin ends of strips, insert the new roll of net in a trench as with upslope I - - - - end and overlapit 18" with the previously laid upper roll. Turn under 6" of I the 18" overlap and staple every 12" across the end. I- --2 - uGroF Undisturbed '�_____-.-------_ - Mine Excavation Floor E"oa Buffer - ------ - - SECTION VIEW - _ -.--. - 11..-- -- -- -_.- _-. --- --------- ------ ---- ---- o.:Q35_ffff_ _-__I_ Proposed Ditch PERSPECTIVE VIEW SYNTHETIC LINER DETAILS Ditcfi Invef ----- a and Flow Dff------I BEGINNING CHANNEL TRENCHING ANCHORING "r � �- SIDE SEAM OVERLAP ____ UPSTREAM/DowNSTREAMOVERLAP -c` 1 -, "',,� 1IIBEGINNING CHANNEL TRENCH ANCHORING 1 Proposed Ditch with Temporary ``` IIi , - _ •---.:.--- Ditch Straw and Net Loring >y �\ -- - y > c_ �, 1; � , `j p �+ \ �- \ ______________.___._______.___ r ropQ.Sed Ditch with a7lynth P.tic > - v �^ I -zri I 10 TRENCH APPROX. _ SOIL PILE -------I--- ',< _,- �`-- v v; "WIDExB"DEEP FROMTRENCH -,. - _�� _ -------- ------------ ------I- - _ ----- ----- ---- - i----- Lining _ ANGH ° _ - - O\N ,. \� ��. - _�\_CHANNEL TERMINATION GRIN _ _- ---- I LI I, _ _, FL •. , �� . _-_ --------- - _-_ Proposed Ditch with CLASS B "°TEE` - 1. STAPLE STAPLE PATTERNS ARE DEPENDENT ON BITE COMDITIONS - - - - STONE or of Similar Size SEE RECYCLEX STAPLE PATTERN GUIDE FOR DETAILS ___--__-__ -_ _____-, - -_ Concrete S ' ===='1_ _ 1 ROW OF STAPLES, SIDE SEAM OVER LAP - 12" O.C. 2 ROWS OF STAPLES, -` STAGGERED, 6" O.C„ -------__. -37° .---_-___-_ Existing Topography (10' Interva s 2"-4" Over Lap EA. DIR. STEP_1 __ _ _ __ _- ___ 3�0_ _' Intervals) 1 4 --� � _ - UPSTREAM/DOWNSTREAM OVERLAP -- 1 I: 2 ROWS OF STAPLES 4" APART, STAGGERED, ` -- 6" O.C., STAPLES TO BE Proposed Proposed Sediment Basin I 6, OVERLAP UPSLOPE LAYER PLACED CLOSE TO EDGE >--= !_STAPLES ARE. THROUGH .OVERLAPS DOWNSLOPE LAYER l OF':TRM 11 IN A SHINGLE AFFECT. I I - BOTH LAYERS I I FLOW Proposed Silt Fence " - Y p CHANNEL TERMINATION ANCHORING � FLOW I _..II Stone Filter Outlet z Rows of STAPLES , 4" APART, STAGGERED, k 1rI� SOIL FILLED ^i - 6" C.C., STAPLES TO BE � FROM SOIL PILE, PLACED CLOSE TO EDGE COMPACT WITH FOOT FLOWIOF LAYER 2 ROWS OF STAPLES _ ' - 1, I I 'APART STAGGERED STEP 2- 4 , 6" O.C. 25' ' / 49i A' I J E 11 r I aE a n- I Road 60' Easement TYPICAL DITCH DETAILS (NTS) - -- - - - I - 1 � 4 1.75' Mina, 1 10'- Ditch No, 2 1 Mulch and Netting 5'- Ditch No. 1 or Synthetic Liner - - - 4 �-- a." \ t - \ 1 1 75 Min. 1 22 - - , . . Filter Fabric -- 10'- Ditch No._2___ --- IClass B Erosion Control Stone i• ----- 5 - Ditch No. 1 or Concrete portions of similar size Should the groundwater drawdown curve indicate an impact to the adjacent unnamed stream, assessmen t of the impact act and proposed p osed modifications to the mine dewatering activity shall be provided to the Water Quality Section within 30 days of the last water level measurement. Erosion Control Sequence and Reclamation Considerations 1. Reconstruct Basin No. 1 with installation of the pipe conduit system and Faircloth Skimmer. 2. Continue mining to the east and north with beneficial fill placed for reclamation of the mine. Final beneficial fill slopes shall be 2:1 ([l:V) or flatter. 3. Increase Basin No. 1 surface area when benficial till area covers the north side of the mine. 4. Add Basin No. 2 and silt fence as needed with the progression of beneficial fill placement. 5. Construct diversion beans upslope of beneficial fill. 6. Remove haul roads and grade area flat except at tle office area near the entrance of the mine. [bad and parking will remain in place at this location. 7. Re -vegetate the ground per the existing mine permit requirements. 8. Once ground cover is established, remove basins and silt fence and re -vegetate area. Maintenance Plan 1 1. All erosion and sediment control practices shall be checked for stability and operation following every runoff -producing rainfall, but in no case less than once weekly. Any needed repairs will be made immediately to maintain all practices as designed. 2. Sediment will be removed from the basins when accumulation is 2 ft, 3. Check Faircloth Skimmer for any defects and repair as needed. If skimmer is imbedded in the sediment, pull skimmer from the sediment and allow i the skimmer to rest on top of the sediment surface. 14. At Basin No. 2, remove and replace stone filter when stone is clogged with fine sediment. 5. Check silt fence for any failure and repair as needed. n ENGINEERING & ENVIRONMENTAL DArl' 2 \ SCIENCE COMPANY 6/3/2008 G\ 3008 Anderson Drive F itatfti: Raleigh, NC 27609 NI �pp (919) 781-7798 I� MINE DETAILS RE`''s ' M AND RECLAMATION 03/19/09 �,) -I Tony Merritt's Gravel Pit scALF;.A ? 5 . Permit. No. 68-04 111=60' Orange County, , NC Tony Merritt's Gravel Pit Sheet No. 3200 Damascus Chruch Road 2 Chapel Hill, NC 27516 2