revised sheet C301 06-26-2020

PPROX
NORTHI
LEGEND
EXISTING PROPERTY LINE
- -
PROPOSED PROPERTY LINE
EXISTING BUILDING
L__J
PROPOSED BUILDING
Q
MINE PERIMETER
PROPOSED SECURITY FENCE
-x-x-x-x-
TEMPORARY DIVERSION DITCH
TD>
TEMPORARY SILT FENCE
PROPOSED ENERGY DISSIPATOR
TEMPORARY CHECK DAM
•
MINE HAUL ROAD
DISTURBED AREA
FLJ
STONE OUTLET
10
TEMP. SLOPE DRAIN
STONE INLET PROTECTION
..
S.D.O.
STORM DRAINAGE OUTLET
SKIMMER BASIN
#2/S.D.O #2
J��/I - f
Se
f f ^\ PERIMETER SECURITY SKIMMER BASIN //...�
FENCE TO CSPAN / S
\ \ ''�)i�p° / /#3� .D.01 #3
_JURISDICTIONAONA L AREA \ '"
STONE OUTLET (TYP.)
SEE DETAIL 7/C502 i1"1
SKIMMER BASIN #1
_SKIMMER BASIN / `..
� C_�/�� _#16/S.D.O. #16 /S.D.O #tf CONTRACTOR TO PROVIDE CURLEX I \ ��
) ( 1EXCELSIOR MATTING ACROSS THE
��LIMITS OF / ENTIRE LENGTH &WIDTH OF ALL
j f //o DISTURBANCE' X/ SKIMMER BASIN SLOPES 3H:1V AND STEEPER
\ y�/ / STONE OUTLET TYP. `\
a�i#12/S.D.O #12 SKIMMER BASIN \� ��\ r SEE DETAIL 7/C502) \ `\
#29/S.D.O. #29
\ \ PERIMETER SECURITY
LIMITS OF ,...� FENCE TO CLEAR SPAN-°q-°.• ____
DISTURBANCE \ JURISDICTIONAL AREA \
V LIMITS OF
GS P DISTURBANCE Jy#
IAV
TAILINGS POND #2
SKIMMER BASIN ASH PLq SKIMMER BASIN \TEMP. SEDIMENT \�\
N7 FENCE TAIL
#28/S.D.O #28 ( � 1 I#11/S.D.O. #11 SEE DETAIL 2/C501
TEMP. SE MENT ( I I / ' J, 11, l I \ I ' 0
FENCE (TYP.) \ �/ `DLU
o \ ' 1 5010Ix100 POND #1 r �
DETAIL 2/C501 \\ \ �4 , J 50' UNDISTURBED SKIMMER BASIN �.
9 S.D.O #9 ,BUFFER
# / \ 600
SKIMMER BAST\ ✓ m \ v l LIMITS OF ` 1 + i / Z \l
#22/S.D.O. #22 /� DISTURBANCE \ \\ : , DISTLIMITS URBANCE
SKIMMER BASIN #10/S.D.O. \ \ \ 65.00 LF-
/ (STORM DRAINAGE OUTLET) #10 j OF 15- RCP �� \ BUF ERDISTURBED
SKIMMER BASIN _--'• I �G \
DISTURBANCE
� 1
SKIMMER`�L1�%tom-��
BASIN I X// ��r �•` ..
. SEE DETAIL 2/( 1"e,005
Mao
,
TEMP. SEDIMENT
FENCE CrY
1
TOTAL DISTURBED AREA = 86.76 ACRES
EROSION CONTROL SEQUENCE NOTES
1. OBTAIN GRADINQ/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 TEMPORARY 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, 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
SLOPES STEEPER THAN
7DAYS
IFSLOPES ARE IO'OR LESS IN
3:1
LENGTI &ARE NOT STEEPER
THAN 2:1, 14 DAYS ALLOWED
SLOPES 3:1 OR
14 DAYS
7 DAYS FOR SLOPES > 50'
FLATTER
IN LENGTH
ALL OTHER AREAS
WITH SLOPES
14 DAYS
NONE
FLATTER THAN 4:1
t
�� TEMPORARY DIVERSION
/ STONE OUTLET (TYP.) ('` �^ SKIMME�#6/S.D.O` ` \ /
/ ;; SEE DETAIL 7/C502 BASIN #1 \ DITCH (TYP.) l f / 50 UNDISTURBED
\ q ��r(r Q #5/S.D.O. \\ \ \ / I '� SE AIL 3/C502 �f / / / / l' BUFFER i f / 72 -�
/ LIMrTS OF / #5 670 _ 1 / / //j �/ / �� . C j1 SKIMMER BASIN f 7. PRIOR TO THE CONTRACTOR DEMOBILIZING FROM THE SITE (AT APPROXIMATELY 45 DAYS PRIOR TO
J f SKIMMER BASIN / / / t / / - J 1 11 / #21/S.D.O. #21. )
/ \ DISTURBANCE �• SKIMMER BASIN #7/ 27 /614 (/i DEMOBILIZATION), THE FINANCIAL RESPONSIBLE PARTY (OR THEIR DESIGNEE WILL NOTIFY THE ENGINEER AND THE
70,00 LF S.D.O #7 / j 1 !( J/ /�/'// I /j-'" J/- �� `!1 / `O,o/616 \ 1 ATE TO LEAVE THE SITE. AN ON -SITE
INSPECTION WILL
EROSION E CONDUCTED PRIOR TO THE LEAVE EAVE DATE BY THEHEIR ANTICIPATED ENGINEER AND/OR THE DESIGNATED EROSION
SKIMMER BIN_ f / �\ 0 \ 5" RCP �_ / -� , • J r�� 'L CONTROL INSPECTOR TO MAKE CERTAIN ALL ACTIONS ITEMS HAVE BEEN ADDRESSED BY THE CONTRACTOR.
#14� D. i #14^ \ % / / PROP. f / _ j / /� m
KEYSTONE STREAM CROSSING SKIMMER BASIN • 50' UNDISTURBED 8. CONTINUE TO MAINTAIN EROSION CONTROL MEASURES UNTIL VEGETATIVE COVER HAS BEEN ESTABLISHED
LIMITS OF- WALL j STRUCTURAL PLATE ARCH #24/S.D.O. #24 l BUFFER ' / ( 620 / / OVER ALL DISTURBED AREAS AND SITE HAS BEEN STABILIZED. REMOVE EROSION CONTROL MEASURES ONLY
DISTURBANCE \ \ I- �' ) I I METAL 24' SPAN x 10'-4" \i / \\` `_ j l l l O Y /� / I ) (i % AFTER FINAL INSPECTION AND APPROVAL BY ENGINEER.
i SKIMMER ` RISE BRIDGE CULVERT BY \ 01 ° N /// o 0
/� / \ 1 ✓ p\ -fin. SKIMMER BASIN 000 0
\ BASIN \\ CONTECH CONSTRUCTION / / '0 ' EROSION CONTROL MAINTENANCE PLAN (CONTRACTOR MUST INCLUDE MAINTENANCE IN BASE BID)
\ PRODUCTS d '� #20/S.D.O. #20 / _ I / O O )
S 64.00 LF � #4/S.D.O #4 � � cp / 1. INSPECT ALL SEDIMENTATION AND EROSION CONTROL DEVICES FOR STABILITY AND FUNCTION EACH WEEK
/ •� OF 15" RCP \ % \\ \ / / /AND FOLLOWING EACH RAINFALL EVENT.
LIMITS OF / MINING LIMITS /� O \61g /
DISTURBANCE `
��/. �^ ,- �' /� / I ! �� \ \ \ ` ✓ �� / / \ \� \\ \�\�� /' / / // / / Sw/1 -616 f / C2. APACITY, REMOVE SILT/SEDIMENT FROM TEMPORARY DEVICES WHEN ACCUMULATED VOLUME HAS REACHED 50%
{ SKIMMER BASIN ( / / MONrrORINC�VELL
_\\ \ #26/S.D.O #26 / \ (\ / / 614 -
LIMrTS OF TEMP. CHECK DAM - (! I \ ( / s / ✓ TET� SEDIMENT / / / 3. REMOVED ACCUMULATED SILT/SEDIMENT FROM BEHIND TEMPORARY SEDIMENT FENCE WHEN DEPTH
//'� /i DISTURBANCE `\ (TYP.) -�� \ 1 / / / �/ 129.73 IF OF FENCE (TYP.) E'�2 EXCEEDS APPROXIMATELY 0.5'. REPAIR AND REPLACE SILT FENCE AS NECESSARY.
/ SEE DETAIL 4/C5C \ 1 66 `I 16" RCP SEE DETAIL 2/C501 (\\ (/ �0/
// ^ 48.03 LF \ LIMITS OF / \ \ \ // \ r Q 4. SEED AND STABILIZE TEMPORARY DIVERSION BERMS IMMEDIATELY AFTER CONSTRUCTION
DISTURBANCE LIMITS OF ( / INCLUDING °CLEAN° WATER DIVERSION BERMS. RE-GRADUREPAIR BERMS AS REQUIRED.
\�\\ OF 15" RCP \\\ \ \ \ \ ` \ / I` \� / \ \\ \ I i 088J / I
1 / DISTURBANCE \ \
_, 63 \ \\ �y -9 5. CONTRACTOR SHALL APPOINT AN THE
INSPECTOR AND MAINTAIN RECORDS OF INSPECTIONS IN
\ ` / \\ 126.90 LF \ / / 0 \ 6 6 O ACCORDANCE WITH THE PROVISION OF THE GENERAL NPDES STORMWATER DISCHARGE PERMIT FOR
\ CONSTRUCTION ACTIVITIES.
SKIMMER BASIN \ / �\ `OF 15" RCP1 TEMP.
#18/S.D.O #18 \ \ / ` \ \ �/ 1 \ 70.00 LF OF I FENCE SENT ONITORING WELL 1 \\ \` & q C
\ \ \ �/ 15" RCP (TYP.) } ) ` \ �\ •O p�� DETAILED CONSTRUCTION SEQUENCE
FES 2 \ 1 1 \ SEE DETAIL 2/C501 \\9 yp
•(N\ �� P�c� LIMITS \� t \ SKIMMER `BASIN `�9i� s�\� 1. CONSTRUCT THE TEMPORARY SURGE STONE CONSTRUCTION ENTRANCE/EXIT OFF CLARK ROAD.
DISTURBANCE / f f PROP. SEPTIC / �o / { 1 1 f \ \ \ \ �A \ \ \ / /
80' OF / / FIELD o / \ \ \ \ ((Si #19/S.D.O. #19 �_ / \ \ 2. INSTALL SILT FENCE AND STONE OUTLETS FROM CLARK ROAD TO THE SOUTH SIDE OF THE STREAM
24" RCP j' r j j / // `/ f\ \ �'^. -� / \ \ LOCATED AT 16+87. SILT FENCE TO BE LOCATED ON BOTH SIDES OF THE ROAD AND SOUTH BANKS OF
7 TEMPORARY EMP. SEDIMENT
\ \ \ \ \ \ ��� y /� \�\ \ THE STREAM.
1
ES 1 FENCE CONSTRUCTION / f
J (\ , \ \
/ A ENTRANCE/EXIT 1 --� � � { SEE DETAIL 2/C5010501 ) � J � , SKIMMER BASIN \ $O. U � / \ � \ \ \ '•�.�- --•-' --�_ �-� / / Ate\ __ � ' � � � \ LG�\\\ \ 3. INSTALL SKIMMER BASIN 6 AND SKIMMER BASIN 7 AND THEIR ASSOCIATED TEMPORARY DIVERSION
SKIMMER BASIN O \ \ l #25/MINE S%R ROISTUR ) ` \ / j 1 J / \\ �rL� \ DITCHES AND SLOPE DRAIN (IF CALLED FOR).
#17/S.D.0 (STORM \ \ \ \ /� / f DEWATERING \ TEMP. SEDIMENT \� �/ / �__ ` f�
DRAINAGE OUTLET j S.D.O #25 /�� " R ` 4. INSTALL IMPERVIOUS CLEAN WATER DIKE AND BYPASS PUMPING SYSTEM AS SHOWN ON SHEET C402.
STONE PIPE INLET - OP DRAINAGE \ \ \ #17'. FENCE (TYP.) 6 / \� / I �g9�\ \\ \ INSTALL THE PERMANENT 54' PIPE AND ENDWALLS AT STATION 16+87.
_PROTECTION \ \ \ \ SEE DETAIL 2 C501
5. APPLY 10' STONE BASE LAYER TO ENTRANCE ROAD AND COMPACT.
:(J i LIMITS OF J i
c D \ \ \ \\ ^ DISTURBANCE \ \ / \ / / \
\ \ \ \ \ 1 \ \ \� //,,...� \ ` �� g.7 \ 6. BACKFILL, PREPARE SLOPES AND OTHER DISTURBED AREAS AND STABILIZE.
�Z W5W-4 IN / � \\ \ >� / / ✓ '� �\/L �/ /� �� I D v \ 7. INSTALL SILT FENCE AND STONE OUTLETS ALONG NORTH SIDE OF THE STREAM.
D ONITORING WELL \ l \ `- -_ �o / �-•- �- �
Z ? 8. INSTALL SILT FENCE AND STONE OUTLETS AROUND THE EXISTING STREAM BUFFER AND PROPERTY
/ 1 =�D , �\ \ \ \ EXISTG,BWELLING �„`\ �,-ST /� i �- BOUNDARY (WHERE DENOTED ON PLANS). INSTALL SKIMMER BASINS 4, 5, 13, 11, 3, 2, 1, 12, 8, AND
1 o r \ A� \ \\ \ \ \ APPROX. CATION \ \ ' ( ( \ ( ( 0 \\C /�
1 1 \ \ / 10 AND THEIR ASSOCIATED TEMPORARY DIVERSION DITCHES AND SLOPE DRAINS (IF CALLED FOR).
(n O \ \ O\ I \ -� \ \ \ \ \ \ \ _10/ 9. PLACE ALL SILT FENCE AND STONE OUTLETS DOWN SLOPE OF ALL PROPOSED BERMS.
rn \ J ��s�\\ 1 \ \ \` \ \ \ \ \\ / ORTH AS LL 00. / ' / y /
/ O / j 1 / J r--- _= \\ �\ \ \ ,p \ \ / } \ / t ` \ `\\ \ F9'�� 10. BEGIN GRADING THE INITIAL MINE AREA, MOVE AND PLACE MATERIAL FOR BERMS. PLACE AND
RE J / Z STTABIIZED WITCT HRIAL FOR PLANT AND IN 1 YEAR OF STARTINGOCKPILE AREA. ALL MINIING ACTIVITIES.
BERMS SHALL BE CONSTRUCTED AND
tx
a F1 , \ \ \ \ \ \\ �� _�'•�630� 11. CONSTRUCT TAILINGS PONDS BEFORE MINING OPERATION BEINGS.
C � v\ \ �� _ \ 12. SEED AND MULCH ALL AREAS THAT ARE NOT COVERED WITH ASPHALT OR STONE.
- _\ STORMWATER SEWER CALCULATIONS AND DESIGN TABLE 13. STABILIZE ALL CHANNELS AND SLOPES WITH MATTING AS NOTED ON THE PLANS.
c s m _ \ _ _
` 1 l ` \ \ ✓ /i 1 \ INLET Q BASED ON 4"/HOUR
E -n� / �\ ` //�\\ n7- - _l/ ) STORM RETURN PERIOD: 10Yrfor TOC=511linutes
640
Airy
97,
/ O \\ n
N`3> pO O 400 \ v t00 200 ' 7W--'400
TYPE
GRATE
RIM
FROM
TO
INLET
AREA
(Ac.)
INLET
Q
CFS
TOTAL
AREA
(Ac.)
I
(in/hr)
C
Q
I CFS
GRATE/
RIM/
THROAT
FROM
INV.
(ft)
TO
INV.
(ft)
APPROX.
LENGTH
(ft)
SLOPE
%
N
D(THEO.)
(inches)
PIPE
SIZE
(inches)
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
RCP
840.16
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
DI
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
RCP
N/A
FES 3
FES 4
4.24
5.09
4.240
7.04
0.30
8.95
N/A
600.24
597.31
64.00
4.58
0.013
12.73
15
RCP
N/A
FES 5
FES 6
2.51
3.01
2.510
7.04
0.30
5.30
N/A
630.50
628.00
70.00
3.57
0.013
10.96
15
RCP
N/A
FES 7
FES 8
5.52
6.62
5.520
7.04
0.30
11.66
N/A
617.75
616.12
129.73
1.26
0.013
17.92
18
RCP
N/A
FES 9
FES 10
0.31
0.37
0.308
7.04
0.30
0.65
N/A
611.00
607.00
65.00
6.15
0.013
4.51
15
RCP
N/A
FES 11
FES 12
3.24
3.89
3.240
7.04
0.30
6.84
N/A
609.60
606.92
64.00
4.19
0.013
11.71
1 15
1 RCP
N/A
FES 13
FES 14
7.58
9.10
7.580
7.04
0.30
16.01
N/A
607.20
606.40
32.00
2.50
0.013
17.74
1 18
1 RCP
N/A
FES 15
FES 16
0.54
0.86
0.536
7.04
0.40
1.51
N/A
609.84
609.00
56.00
1.50
0.013
8.05
1S
RCP
REINFORCED CONCRETE PIPE(RCP) TO BE CLASS KPIPEJOINTS PER ASTMC443; TYPE 2 PIPE INSTALLATION ASTAI CI 479
E
DROP INLETS 1 & 2 TO BENCDOT STANDARD 840.14 WITH 840.16 FRAME& GRATES
e° }
FLARED END SECTION (FES)
0 0_
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.
0, LaBeRa
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Z ti9
A'ST t e
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© 2019 LaBella Associates
ALAMANCE
AGGREGATES, LLC
Mr. Chad Threatt, VP
Snow Camp Mine
3
6/26/20
REMOVED REFERENCE TO C302
2
3/31/20
NCDEMLR COMMENTS
ADDITIONAL STREAM INFO - ALAM. AGG.
1
1/20/20
& LAND QUALITY COMMENTS
NO:
DATE:
DESCRIPTION:
REVISIONS
PROJECT NUMBER:
2190335
DRAWN BY:
KCG/ATC/BWS
REVIEWED BY:
PAS
ISSUED FOR:
CONSTRUCTION
DATE:
6/26/20
DRAWING NAME
OVERALL
SEDIMENTATION &
EROSION CONTROL
PLAN
DRAWING NUMBER:
C301