C301 Overall EC (2)

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Stny0 `"`..'°"\°\ \ 1 ; �� "'`^- 'n .,.,,,r • ✓ ,"•^. lr. -' '__.-_. . ' d f /r,.."-- ~-,,., ` ` 4 ` {t \
-'".' f=.---'" ..�---_ .. �'-=-.� "'.,``.'` \ '�•"�'.�.---� -\,\\ � \;� ,,,�� �--n _ __. _`'• ..,-'°.` �,--. �"' �.-`" - .__---' e ''r'�j'. � 11 � I f' 4 ..___
LEGEND
EXISTING PROPERTY LINE
- -
PROPOSED PROPERTY LINE
EXISTING BUILDING
- -
L_J
PROPOSED BUILDING
MINE PERIMETER
PROPOSED SECURITY FENCE
-x-x-x-x-
TEMPORARY DIVERSION DITCH
TD >
TEMPORARY SILT FENCE
PROPOSED ENERGY DISSIPATOR
�1
TEMPORARY CHECK DAM
v
MINE HAUL ROAD
DISTURBED AREA
r
STONE OUTLET
TEMP. SLOPE DRAIN
STONE INLET PROTECTION
r
S.D.O.
STORM
DRAINAGE OUTLET
,.-
SKIMMER BASIN �� l
\ -- l
1
6
t
PERIMETER SECURITY
J FENCE TO CLEAR SPAN
_JURISDICTIONAL AREA
�� !r.•'/'����� / 1 j � _�, , "� �-� STONE OUTLET (TYP.)
SEE DETAIL 7/C502
SKIMMER BASINI /
#16/S.D.O. #16
�I
LIMITS OF
DISTURBI
r �/1 ll
( z
l � f
TEMP. SEDIMENT
f ��
(�
f / FENCE TYP.
SEE DETAIL 2/C501
r70
r -
/ SKIMMER BASIN
/O �\� #22/S.D.O. #22
Xx- -% SKIMMER BASIN #10/S.D.O. \` \ 65.00 LF Z'
(STORM DRAINAGE OUTLET) #10 \ OF 15" RCP_ - <
SKIMMER BASIN _ 0
j %%r' �•�p-...-. LIMITS OF jj f /i' #8/S.D.O #8 QR
�s 2. DISTURBANCE (�
O
r
- --- - NO GRADING / CLEARING,OR OTHER
/ / - !��-o X1 [ I ' CONSTRUCTION ACTIVITIES TO OCCUR
"+ �!' WITHIN THE 50' UNDISTURBED STREAM
BASIN '" BUFFER UNLESS PRIOR WRITTEN
# / D O #3 G APPROVAL IS GIVEN.
SKIMMER BASIN #1 6s -�
R l /S.D.O #1_�
r / CONTRACTOR TO PROVIDE CURLEX I \\ 1
EXCELSIOR MATTING ACROSS THE \
( ENTIRE LENGTH &WIDTH OF ALL \
SKIMMER BASIN SLOPES 3H:1V AND STEEPER
#12/S.D.0 #12 ° " -. ---"STONE OUTLET (TYP.) `t `
SKIMMER BASIN'\ ® / #29/S.D.O. #29 \ SEE DETAIL 7 C502
PERIMETER SECURITY
0•, )
LIMITS OF ��I ✓ \ � \-� FENCE TO CLEAR SPAN
DISTURBANCE'" Y 1\ JURISDICTIONAL AREA
/ - _
LIMITS OF
DISTURBANCE
tj /5/00*x1 OO'
SKIMMER BASIN Q 3y PIgNr 1 e xt TEMP. SEDIMENT
`P SKIMMER BASIN `FENCE (TYP.)
#28/S.D.O #28 ( I#11/S.D.O. #17 SEE DETAIL 2/C501 _ Stt
i
ow----- _ TAILINGS POND
fzm SKIM ER BASIN \ { 50' UNDISTURBED } \ \
Z, #9/S.D.O #9 1 __.._ \` /
LIMITS OF
DISTURB \ ANCE LIMITS OF
DISTURBANCE •- O r- .: i
\ y SKIMMER BASIN BUFFER
#13/S'.D.O #13,
�,r �ti�
i ./
1 _
f�j` I SKIMMER BASIIN/// ( S0,� LIMITS OF
/ DISTURBANCE
f „ l SKIMMER BASIN,
,- #15/S.D.O #15) },S GN ( � 23 S.
TEMP. SEDIMENT �\p /Ii jINC
/ , J
/ FENCE (TYP.)�OFO \ o�
l SEE DETAIL
G A SKIMMER
BASIN
/ #6/S D 0 TEMPORARY DIVERSION
TOTAL DISTURBED AREA = 86.32 ACRES
EROSION CONTROL SEQUENCE NOTES
1. OBTAIN GRADING/EROSION CONTROL PLAN APPROVAL AND PERMIT.
2. CONTACT EROSION CONTROL INSPECTOR TO ESTABLISH A PRE CONSTRUCTION CONFERENCE AND INSPECTION
SCHEDULE.
SELF INSPECTION ----- EFFECTIVE OCTOBER 1, 2010, PERSONS CONDUCTING LAND -DISTURBING ACTIVITIES,
LARGER THAN ONE (1) ACRE MUST INSPECT THEIR PROJECT AFTER EACH PHASE OF THE PROJECT, AND DOCUMENT
THE INSPECTION IN WRITING ON APPROVED FORMS,
THE PHASES ARE AS FOLLOWS:
1. INSTALLATION OF PERIMETER EROSION AND SEDIMENT CONTROL MEASURES.
2. CLEARING AND GRUBBING OF EXISTING GROUND COVER.
3. COMPLETION OF ANY PHASE OF GRADING OF SLOPES OR FILLS,
4. INSTALLATION OF STORM DRAINAGE FACILITIES.
5. COMPLETION OF CONSTRUCTION OF DEVELOPMENT.
6. ESTABLISHMENT OF PERMANENT GROUND COVER SUFFICIENT TO RESTRAIN EROSION,
3. CLEAR SITE ONLY AS NECESSARY TO INSTALL INITIAL EROSION CONTROL MEASURES AS FOLLOWS:
A. TEMPORARY CONSTRUCTION ENTRANCE/EXIT AT CLARK ROAD.
B. THIS SITE HAS TE
MPORARY EFdPORARY SKIMMER BASINS AND SEDIMENT BASINS AS SHOWN,
C. TEMPORARY DIVERSION BERMS
D. TEMPORARY SILT FENCING AND STONE OUTLETS
E. SEED EMBANKMENTS AND DISTURBED AREAS OF DEVICES (INCLUDING "CLEAN" WATER DIVERSION) UPON
COMPLETION OF CONSTRUCTION. SEE GROUND STABILIZATION CRITERIA BELOW FOR MORE INFORMATION,
4. BEGIN CLEARING GRUBBING,
RUBB NG, AND STRIPPING OF SITE AS REQUIRED.
EARTHEN -MATERIAL STOCKPILES ON -SITE FOR LATER DISTRIBUTION AND/OR REMOVAL. AREAS DEDICATED FOR
MANAGEMENT OF LAND CLEARING AND DEMOLITION DEBRIS, CONSTRUCTION AND DOMESTIC WASTE, AND
HAZARDOUS OR TOXIC WASTE SHALL BE LOCATED AT LEAST 50 FEET AWAY FROM STORM DRAIN INLETS AND
SURFACE WATERS (UNLESS IT CAN BE SHOWN THAT NO OTHER ALTERNATIVES ARE REASONABLY AVAILABLE), AND
WITHIN AREAS PROTECTED BY EROSION CONTROL MEASURES.
5. BEGIN SITE GRADING, MAINTAIN EROSION CONTROL DEVICES IN ACCORDANCE WITH THE MAINTENANCE PLAN.
INSTALL ADDITIONAL EROSION CONTROL MEASURES AS REQUIRED.
6. INSTALL STORM DRAINAGE SYSTEM AND UTILITIES. STORM PIPING MUST BE INSTALLED TO THE POINT WHERE IT
ENTERS EACH DEVICE. COMPLETION OF PIPING WILL ONLY BE ALLOWED ONCE THE SITE HAS BEEN DEEMED STABLE BY
THE EROSION CONTROL INSPECTOR. INSTALL PROTECTION AROUND ALL INLETS AS STORM DRAIN SYSTEM IS
INSTALLED.
DESCRIPTION
STABILIZATION
STABILIZATION
TIMEFRAME
TIMEFRAME
EXCEPTIONS
PERMANENT DIKES,
SWALES, DITCHES, &
7 DAYS
NONE
SLOPES
LOPES STEEPER THAN
7DAYS
IFSLOPESARE 10 OR LESS IN
LENGTH S ARE NOT STEEPER
THAN 2:1, 14 DAYS ALLOWED
SLOPES 3:1 OR
14 DAYS
7 DAYS FOR SLOPES 1 50'
- FLATTER
IN LENGTH
ALL OTHER AREAS
WITH SLOPES
14 DAYS
NONE
FLATTER THAN 41
STONE OUTLET (TYP.) �C" SKIMMER ' . __ // r , -- ' �- o R
DITCH TYP
SEE DETAIL 7/C502 / BASIN #6 SEE DETAIL 3 (502 / r y
ti 50' UNDISTURBED'
4. 1"V P M #5/S.D.O. -�a. / BUFFER ....
•'� // LIMITS OF r #5 `67C�--�...� f�/ I -'` 2 / / f / �'`� ��"'" t / �r''" -- SKIMMER BASIN / ~� 7. PRIOR TO THE CONTRACTOR DEMOBILIZING FROM THE SITE AT APPROXIMATELY 45 DAYS PRIOR TO
DISTURBANCE SKIMMER BASIN / ,! f / / __ r 21 S D.O. 21. \ / 40' SKIMMER BASIN #7/ # / # J r f -`' / --�., # / 'II �� "�-.� DEMOBILIZATION), THE FINANCIAL RESPONSIBLE PARTY (OR THEIR DESIGNEE) WILL NOTIFY THE ENGINEER AND THE
/ !" 27 S.D.O 27 j / r / / r 70.00 LF _,. j S.D.O _ / / t f�1/ r/ / / / { / % ` } /
/ ,r'r / / % / / /f / � y -`y � � ' -,, i DESIGNATED EROSION CONTROL INSPECTOR OF THEIR ANTICIPATED DATE TO LEAVE THE SITE, ANON -SITE
SKIMMER BASIN. OF 15" RCP' % ,./"? /,,��/ / r' .�/ / /_ / t j{{ { / / INSPECTION WILL BE CONDUCTED PRIOR TO THE LEAVE DATE BY THE ENGINEER AND/OR THE DESIGNATED EROSION
# / # �` / \ / /s-_� r ' // �.,.--^^' �~ f f CONTROL INSPECTOR TO MAKE CERTAIN ALL ACTIONS ITEMS HAVE BEEN ADDRESSED BY THE CONTRACTOR.
14 S.D.O 14 ` f
---" STREAM CROSSING t "" "'`" -''r` `f �
r f KEYSTONE j SKIMMER BASIN r -, --`50' UNDISTURBED
LIMITS OF'-'` / WALL l STRUCTURAL PLATE ARCH #24/S.D.O. #24 "'- ' �, BUFFER r' / J /'' �I �� j f B. CONTINUE TO MAINTAIN EROSION CONTROL MEASURES UNTIL VEGETATIVE COVER I1A5 BEEN ESTABLISHED
" DISTURBANCE % / '^+Y 1 0 I { METAL 24' SPAN x 10'-4" °^....-• /f Y"- / OVER ALL DISTURBED AREAS AND SITE HAS BEEN STABILIZED. REMOVE EROSION CONTR01. MEASURES ONLY
SKIMMER RISE BRIDGE CULVERT BY AFTER FINAL INSPECTION AND APPROVAL BY ENGINEER.
5 BASIN CONTECH CONSTRUCTION / _ �� �" SKIMMER BASIN%y�/ / % j r
,-_ --. \� # / # \ `PRODUCTS ,r ca' "\` ♦ #20/S. D.O. #20, / f� !� \,�»._ / r % / / • EROSION CONTROL.MAINTENANCE PLAN (CONTRACTOR MUST INCLUDE MAINTENANCE IN BASE BID)
64.00 LF 4 S.D.O 4 \ \ /
,5�•'`�'r -"' OF 15" RCP ,„... \ / . ` \ \,, f,, 1 '•�.. `,, / Yam.-' / ,f'J f f 1. INSPECT ALL SEDIMENTATION AND EROSION CONTROL DEVICES FOR STABILITYAND FUNCTION EACH WEEK
9 --- ^- ,r' "~"�. -•.,- \ LIMITS OF \ t , , l f MINING LIMITS �` / r /t AND FOLLOWING EACH RAINFALL
/ f' j EVENT.
- - / DISTURBANCE X i % y / '
Y .�-" ""'� ,�/�/ /`r ''/,,r �" ` } ' y'''""" \'�° ' ,.--'" f ` \�\ �'�' `�� / """•" ''� .-' �.� / r / 2. REMOVE SILT/SEDIMENT FROM TEMPORARY DEVICES WHEN ACCUMULATED VOLUME HAS REACHED 50%
e i,,,✓ r' /f - I / - -_ \ `1 �. SKIMMER BASIN �,. �%r,% F,,..' r,." CAPACITY.
LIMITS OF / TEMP. CHECK DAM #26/S.D.O #26 r/ ( //
l -DISTURBANCE / l / f / _._-.,_ - / (TYP-) "' \ \II -"' 139.73 LF ` / / ..r- 3. REMOVED ACCUMULATED SILT/SEDIMENT FROM BEHIND TEMPORARY SEDIMENT FENCE WHEN DEPTH
SEE DETAIL 4/C501 "'-- \ !I f t \\\ q ,r �k0 - 13 18" RCP ''l-,,., _ `,, / .. R,„✓� EXCEEDS APPROXIMATELY 0.5'. REPAIR AND REPLACE SILT FENCE AS NECESSARY.
/ 48.03 LF O \ \ LIMITS OF / - ( ( % 10 I ` /
l ` \ DISTURBANCE \ ._.. -- �/' TEMP. SEDIMENT ",,.M ",�• l '"" Q 4. SEED AND STABILIZE TEMPORARY DIVERSION BERMS IMMEDIATELY AFTER CONSTRUCTION INCLUDING
OF 15' RCP \ LIMITS OF -FENCE (TYP.) \\\ / I
\� \ ` /" j '`�,� r'.�j,,. ``•� ` \\ ` \\ r'"� -\ / I I ` O,� " DISTURBANCE "CLEAN" WATER DIVERSION BERMS. RE-GRADE/REPAIR BERMS AS REQUIRED.
SEE DETAIL 2/C501 ( \� (\
` `63 \ " \ f""``•� 5. CONTRACTOR SHALL APPOINT AN ON -SITE INSPECTOR AND MAINTAIN RECORDS OF INSPECTIONS IN
126.90 LF ACCORDANCE WITH THE PROVISION OFTHE GENERAL NPDES STORMWATER DISCHARGE PERMIT FOR
_ p r C O CONSTRUCTION ACTIVITIES.
SKIMMER BASIN \ \ \\ \
#18/S.D.O #18 \ OF 15" RCP �/ \ "
FES 2 1 \ \ , P° \ 1 \ \ 70.00 LF OF I / TEMP. SEDIMENT
�' 15" RCP FENCE (TYP.) \ „J A10 � % DETAILED' CONSTRUCTION SEQUENCE
LIMITS OF f� ( j / /� \ 1 r SEE DETAIL 2 C501 ( O g,
DISTURBANCE �! / PROP. SEPTIC / f' /j f, _ a �. a % / ` F \ /\�
...� 2t •..,, -°.., i. CONSTRUCT THE TEMPORARY SURGE STONE CONSTRUCTION ENTRANCE/EXIT OFF CLARK ROAD.
'h "" "^°" �. % � '"`'SKIMMER BASIN / ` ] tY ,�
80' OF/ / \ 1 / \ FIELD ! 00 / { _ \ \ a a, - \S`3 �..#19/S.D.O. #19 �. - % / + R. ��\ yF)
24" RCP�_ 6`P \ 1 2. INSTALL SILT FENCE AND STONE OUTLETS FROM CLARK ROAD TO THE SOUTH SIDE OF THE STREAM
TEMPORARY TEMP. SEDIMENT �` ~'' ( { \ \ `�.. ---.,.., h /// `44V `"., ` LOCATED AT 16+87, SILT FENCE TO BE LOCATED ON BOTH SIDES OF THE ROAD AND SOUTH BANKS OF
FES 1 ' CONSTRUCTION j / ( ) - .. \ \ s /' i l Jrj (HE STREAM
I FENCE TYP. \ \ (�" \
m ENTRANCE/EXIT
_ SEE DETAIL 2/C501 , SO,
\\\ /
2 �•,% SKIMMER BASIN co \ -` ,.w SKIMMER I \ UNa/ ~`)`^-.,, ` ----" ----- --„_.. _- •' ,p��•.,,, �2p� + 3. INSTALL SKIMMER BASIN 6 AND SKIMMER BASIN 7 AND THEIR ASSOCIATED TEMPORARY DIVERSION
# / ( ` \ \ / #25/MINE R�MS�R@ / ! i _. ✓O _ l! ).
I ,✓ // � r 17 S D.0 STORM ` `-- / f DITCHES AND SLOPE DRAIN IF CALLED FOR
\ �,� j DEWATERING / BU fp
-
DRAINAGE OUTLET) / / FFF \ TEMP. SEDIMENT _ 0 \ G °
STONE PIPE INLET 1 % S.D.O #25 ti R \ _e..,, �� _, f r J 0
PROTECTION #17 \ ""� FENCE (TYP.) ---' '•-,, x --"`"'/✓fir % --� ti .�� 4. INSTALL IMPERVIOUS CLEAN WATER DIKE AND BYPASS PUMPING SYSTEM AS SHOWN ON SHEET C402
fr1 Z^ t ` •�.,, \ "'-., - �'^ „� /_ F,.,...�^'"`" T'`-.,�,' �„-,6. SEE DETAIL 2/C501 �_ ---"f rI j�r�'y�Q \, '\� INSTALL THE PERMANENT 54" PIPE AND ENDWALLS Al STATION 16+87.
C O ` ~` �- ~~ `.r ~� ~~� \ 3D^,,, 1 ` \\ �^ \\ `•./ ( I I �,ty�, G 5. APPLY 10"STONE BASE LAYER TO ENTRANCE ROAD AND COMPACT,
�� � _ DISTUR ANCE �\ r� �. /l T��� ti`
j \ q�P
,„� C` t4 `
Z / ` \ , \ -,.` •--'-'^"� ~"""" \ f "'" _ --_.mm - !-, '"� ` /// / r/ 4 ,E"j �� d �S� �" 6. BACKFILL, PREPARE SLOPES AND OTHER DISTURBED AREAS AND STABILIZE.
rD ( \•'-O_- O ,.�' `'\ '�.m.......__.---y C
n r1 -1 ` \, �p `�- •� \ 1 } %!~ '' _,�.-.- .,� ,,�'"F .,�'"1 „r °kZ^ 7. INSTALL SILT FENCE AND STONE OUTLETS ALONG NORTH SIDE OF THE STREAM.
�\ _�� } A �\ \ �., �\ ^ham, V joo, �r f,,^• �.Y. A z ✓ 8 INSTALLSILT FENCE AND SI ONE OUTLETS AROUND THE EXISTING STREAM BUFFERAND PROPERTY
} O ` O \l ry. �, alM1 \ �. \ t ` \ \ _-- CR --------SrR� �r,"% rr' t co - .,� BOUNDARY (WHERE DENOTED ON PLANS). INSTALL SKIMMER BASINS 4, 5, 13, 1 i, 3, 2, t, 72, B, AND
\ \ \ \ ��, �'''"��� 10 AND THEIR ASSOCIATED TEMPORARY DIVERSION DITCHES AND SLOPE DRAINS (IF CALLED FOR).
1 ,f� D ) ,q� j f ,,� „� ".� " \ \) \ ' \ �jG� 9. PLACE ALL SILT FENCE AND STONE OUTLETS DOWN SLOPE OF ALL PROPOSED BERMS.
FIT
FIT
r 0 // / ( // 1f( t \ /
1 / OZ �""„ \\\``\N �� "'"�`.,„�~\�.� \ l l ("- "�„ti A -.�„ `" -�, � ( \ �, , 1 1 \ �s "XR� 7\jy _,� ,,. ^,, f y�y ip M BEGIN GRADING THE INITIAL MINE AREA, MOVE AND PLACE MATERIAI. FOR BERMS. PLACE AND
STOCKPILE AREA.
` \ �^ l C ��� Tom' ,l \ .,� -�..s.\ .,�� \\\ ` `O " R -„g -"•t `•.. m� "-''" f , `\ J\ / Te �"�� �\ -- ,,, -A Q'�. q ? STABILIZED WITHIN 1 YEAR OFCOMPACT MATERIAL FOR FSTARTING MINING ACTIVITIES. L BERMS SHALL BE CONSTRUCTED AND
11. CONSTRUCT IAILINGS PONDS BEFORE MINING OPERATION BEINGS.
STORMWATER SEWER CALCULATIONS AND DESIGN TABLE
INLET Q BASED ON 4"/HOUR 12. SEED AND MULCH ALL AREAS THAT ARE NOT COVERED WITH ASPHALT OR STONE.
STORM RETURN PERIOD: 10 Yr for TOC=5 Minutes
TYPE
GRATE
RIM
FROM
TO
INLET
AREA
(Ac.)
INLET
Q
CFS
TOTAL
AREA
(Ac.)
I
(in/hr)
C
Q
CFS
GRATE/
RIM/
THROAT
FROM
IN
(ft)
TO
INV.
(ft)
APPROX.
LENGTH
(ft)
SLOPE
'%.
N
D(THEO.)
(inches)
PIPE
SIZE
(incises)
PIPE
MATERIAL
N/A
FES 1
FES 2
7.91
9.49
7.910
7.04
0.30
16.71
N/A
612.59
611.79
80.00
1.00
0.013
21.40
24
IILP
840.1.6
DI
D12
0.45
0.90
0.450
7.04
0.50
1.58
632.50
630.25
626.95
126.90
2.60
0.013
7.39
15
RCP
840.16
D12
FES 13
0.19
0.61
0.64
7.04
0.80
3.60
629.20
626.95
624.48
48.03
5.14
0.013
8.86
15
12CP
N/A
FES 3
FES 4
1 4.24
1 5.09
1 4.240
7.04
0.30
1 8.95
1 N/A
I 600.24
597.31
I Ad no
4.58
0.013
12.73
15
RCT
N/A
FES 5
FFS 6
2.51
3.01
1 2.510
7.04
0.30
1 5.30 1
N/A
630.50
628.00
70.00
3.57
0.013
I0.96
14
RCP
N/A
FES 7
FES S
5.52
6.62
5.520
7.04
0.30
11.6G
N/A
617.7.5
616.00
139.73
1.25
0.013
17.93
18
RCP
N/A
FES 9
FES 10
0.31
0.37
0.308
7.04
0.30
0.65
N/A
6t1.00
G07.00
65.00
6.15
0.013
4.51
_
e 15
RCP
N/A
FES It
E•GS 12
3.24
3.89 1
3.240
7.04
0.30
6.84
N/A
609.G0
606.92
64.00
4.19
0.013
11.71
15
RCP
O �1
REINFORCED CONCRETE PIPE (RCP)TOBECLASS 1If,P1PEJOfNTSPERASTMC443;TYPE2PIPE INSTALLATION ASTMC1479
too zoo 300 0 / /- fin✓ Y DROP INLETS I & 2 TO BENCDOT STANDARD 840.14 WM1840.16 FRAME& GRATES
P' o0 1 FLARED END SECTION (FES)
�;�, \�-
13. STABILIZE ALL CHANNELS AND SLOPES WITH MATTING AS NOTED ON THE PLANS,
SEEDING NOTE
SEED MIXTURE, SEEDING RATE, AND SOIL AMENDMENTS TO
BE APPROVED BY AN ENVIRONMENTAL PROFESSIONAL AND
SUBMITTED TO OWNER AND ENGINEER PRIOR TO
APPLICATION. SEED MIXTURE TO BE A MIXTURE OF RED
CLOVER, CREEPING RED FESCUE, AND A GRAIN, SUCH AS,
OAT, WHEAT, OR RYE.
B(
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© 2019 LaBelle Associates
ALAMANCE
AGGREGATES, LL
a1 Threatt, P
DATE: DESCRIPTION:
REVISKIONS
PROJECT NUMBER:
2190335
DRAWN BY: KCG/ATC
REVIEWED BY: PAS
ISSUED FOR:
CONSTRUCTION
DATE:
7/22/19
DRAWING NAME:
DRAWING
OVERALL
CONTROLSEDIMENTATION &
i +
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k