7-Snow Camp Plan Sheet 301

LEGEND
EXISTING PROPERTY LINE
- -
PROPOSED PROPERTY LINE
- -
EXISTING BUILDING
f
L_J
PROPOSED BUILDING
0
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
F J
STONE OUTLET
p
TEMP. SLOPE DRAIN
STONE INLET PROTECTION
�.
S.D.O.
STORM DRAINAGE OUTLET
\ \� // ��= SKIMMER BASIN
#2/S.D.0 #2
PERIMETER SECURITY )� l� �ER l D.0 SKIMMER BASIN �1 \
\ J FENCE TO CLEAR SPAN 3 S 3 G
��\\\_ JURISDICTIONAL AREA # / I I #
STONE OUTLET (TYP.)
SEE DETAIL 7/C502
/i SKIMMER BASIN #1
///��� _ SKIMMER BASIN / ` /S.D.O #1 \\�� / `SG°
�/ - #16/S.D.O. #16 t / / CONTRACTOR TO PROVIDE CURLEX I
j�� EXCELSIOR MATTING ACROSS THE I
/// LIMITS OF 1I 1 , ENTIRE LENGTH & WIDTH OF ALL I
/// DISTURBANCE �p 1- -\ \ I
/ /� /// r I SKIMMER BASIN SLOPES 3H:1V AND STEEPER I \
// //// //\� \\\ #12/S.D.O #12 V \� �` x -STONE OUTLET (TYP.) \ \\
1\\\�\\���\\ SEE DETAIL 7/C502 J \
PERIMETER SECURITY -AJ
LIMITS OF �- / \ FENCE TO CLEAR SPAN
DISTURBANCE 1 JURISDICTIONAL AREA
DIISTURBANCE =
/ ///Ul
TEMP. SEDIMENT \
LSKIMMER�' #11/S.D.O A#1 'FENCE (TYP.) 1I SEE DETAIL 2/C501
0 I 1 I
TEMP. SEDIMENT �
../
FENCE (TYP.) W W TAILINGS POND #1- \\\ I \�
/ / \ CO500'x100' ` 1
I SEE DETAIL 2/C50I 5
O m J 50' UNDISTURBED N
BUFFERTAILINGS POND #2/ � 500'x100'
\
SKIMMER BASIN Z LIMITS OF \ I I
\ \\ \ \\\ I \ \ #22/S.D.O. #22 / �I DISTURBANCE \\\\ \ LIMITS OF
DISTURBANCE'
SKIMMER BASIN #10/S.D.O. \ \ 65.00 LF \ \\ \ / / / \ ���A4
(STORM DRAINAGE OUTLET) ) # 10
SE \ OF 15" RCP / \ 50' UNDISTURBED ��/
/ j \ \ I / � \ ,� - BUFFER
, / / % / SKIMMERE / SKIMMER
SED.O A 1I3 \ / 6 1 I I I II I\ I I po\ \ \
�. LIMITS OF / #8/S.D.O
I I DISTURBANCE / C o 0 /
N� i LIMITS OF \ \ `620 \__
\
SKIMMER BASIN SO, IST BANCE A,✓ �\ \ SKIMMER BASIN/
#15/S.D.0 #15) // \Sp (�,y \ \ #23/S.D.O. #23
SEE DETAIL 2/C501
TOTAL DISTURBED AREA = 86.34 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 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
7 DAYS
IF SLOPES ARE 10' OR LESS IN
3:1
LENGTH & 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
-/ STONE OUTLET (TYP.) ( SKIMMER--, #6 \ ,
= f TEMPORARY DIVERSION
I 1 \ \ DITCH (TYP.) / n
SEE DETAIL 7/C502 i \ / - BASIN 1\-u• ►qi ,� _ � / 50' UNDISTURBED, �
- #5/S.D.O. - \ �� SEE DETAIL 3/C502 / / / BUFFER
LIMITS OF / / #5 -610 _ \ / >/ / / / / / � / �� - SKIMMER BASIN 7. PRIOR TO THE CONTRACTOR DEMOBILIZING FROM THE SITE (AT APPROXIMATELY 45 DAYS PRIOR TO
\ / DISTURBANCE �� SKIMMER BASIN / / I I I 21/S.D.O. 21 /
40 SKIMMER BASIN #7/ #27/S.D.O #27 / / / / / / / J # , # \� / DEMOBILIZATION), THE FINANCIAL RESPONSIBLE PARTY (OR THEIR DESIGNEE) WILL NOTIFY THE ENGINEER AND THE
70.00 LF S.D.O #7 % / / / / / / / / // / // / / / I / / l 1 DESIGNATED EROSION CONTROL INSPECTOR H THEIR ANTICIPATED DATE TO LEAVE THE SITE. ES ON SITE
SKIMMER BASIN � OF 15" RCP' / � / / / // � / I I 'INSPECTION WILL BE CONDUCTED PRIOR TO THE LEAVE DATE BY THE ENGINEER AND/OR THE DESIGNATED EROSION
# 14/S.D.O # 14 \ � / PROP. / CONTROL INSPECTOR TO MAKE CERTAIN ALL ACTIONS ITEMS HAVE BEEN ADDRESSED BY THE CONTRACTOR.
/� KEYSTONE STRSTRUCTURAL PLATE ARCH IN SKIMMER BASIN /// \ / B0 FFER UNDISTURBED / // / /�/� / / I J 8. CONTINUE TO MAINTAIN EROSION CONTROL MEASURES UNTIL VEGETATIVE COVER HAS BEEN ESTABLISHED
\ LIMITS OF - WALL #24/S.D.O. #24 / ( - I/ /J OVER ALL DISTURBED AREAS AND SITE HAS BEEN STABILIZED. REMOVE EROSION CONTROL MEASURES ONLY
/ DISTURBANCE 1' �W II I I METAL 24' SPAN x 10'-4" , _ T� 1` J I �p / / I hem j� \ l AFTER FINAL INSPECTION AND APPROVAL BY ENGINEER.
SKIMMER RISE BRIDGE CULVERT BY
BASIN \\ CONTECH CONSTRUCTION 1 / SKIMMER BASIN EROSION CONTROL MAINTENANCE PLAN (CONTRACTOR MUST INCLUDE MAINTENANCE IN BASE BID)
s / 64.00 LF o / LIMITS OF uA 7S.D.0 #4 PRODUCTS d \� #20/S.D.O. #20, / / j ^,�w��� j /
` I 1. INSPECT ALL SEDIMENTATION AND EROSION CONTROL DEVICES FOR STABILITY AND FUNCTION EACH WEEK
OF 15" RCP
DISTURBANCE ` / MIN NG LIMITS X / � - � / /� / I \ \ / AND FOLLOWING EACH RAINFALL EVENT.
2. REMOVE SILT/SEDIMENT FROM TEMPORARY DEVICES WHEN ACCUMULATED VOLUME HAS REACHED 50%
��\ \ \ SKIMMER BASIN \ / / / / / CAPACITY.
\ LIMITS OF TEMP. CHECK DAM 3. REMOVED ACCUMULATED SILT/SEDIMENT FROM BEHIND TEMPORARY SEDIMENT FENCE WHEN DEPTH
DISTURBANCE (TYP.) --- \ \ I I / / 139.73 LF EXCEEDS APPROXIMATELY 0.5'. REPAIR AND REPLACE SILT FENCE AS NECESSARY.
/
SEE DETAIL 4/C501 / ` \ \ ro�� OF 18" RCP / / _ \ \
48.03 LF \ LIMITS OF / \ r -- / TEMP. SEDIMENT \ / / 1� Q 4. SEED AND STABILIZE TEMPORARY DIVERSION BERMS IMMEDIATELY AFTER CONSTRUCTION INCLUDING
OF 15" RCP \ \ \ \\ \ \ DISTURBANCE ) \ LIMITS OF L FENCE (TYP.) / I "CLEAN" WATER DIVERSION BERMS. RE-GRADE/REPAIR BERMS AS REQUIRED.
J 26.90 LF/
SKIMMER BASIN `OF 15" RCP
#18/S.D.0 #18
\ 70.00 LF OF
FES 2 \ \ \ , oP° I 1 I I / / \ \ 15" RCP
LIMITS OF
DISTURBANCE PROP. SEPTIC
80' OF / \ / \ I FIELD
24" RCP x I / / / ) •Y. / ` 1 \ \ \,
TEMPORARY / I TEMP. SEDIMENT
6, \ \ /
FES 1 CONSTRUCTION I ( FENCE (TYP.)
o. \ ( SEE DETAIL 2/C501 I I 1 \ SO'
ENTRANCE/EXIT /
_ 1 SKIMMER BASIN
SKIMMER BASIN I ( t° \ \ \ \ / , I #25/MINE \ STRFq� STUR6
0)
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F- /.
06 >-
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(6 Ca
m / / DRAINAGE OUTLET) \ \ \ /� / D SWD.O #25 ATERINGeUFFER TEI
STONE PIPE INLET \ \ \ \ \
#17
PROTECTION \ \ \ \ \ / -� �_ SEE E
/ C�
C^ ' 1 \ \\\ \ I \ \ \ J \ 630 i
\ \ LIMITS OF \
C y DISTURBANCE
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I I AD
\ \
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STORMWATER SEWER CALCULATIONS AND DESIGN TABLE
INLET Q BASED ON 4 "/HOUR
STORMRFTITRN PERIOD: 10 Yr for (TOC=5 Minuted
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
(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
840.14
DI
DI2
0.45
0.90
0.450
7.04
0.50
1.58
N/A
630.25
626.95
126.90
2.60
0.013
7.39
15
RCP
840.14
D12
FES 13
0.19
0.61
0.64
7.04
0.80
3.60
N/A
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
70.00
4.19
0.013
12.95
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
616.00
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
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
15
RCP
I REINFORCED CONCRETE PIPE (RCP) TO BE CLASS IM PIPE JOINTS PER ASTM C443; TYPE 2 PIPE INS TALILATION AS TM C1479
DROP INLETS 1 & 2 TO BENCDOT STANDARD 840.14
\ FLARED END SECTION (FES)
\ DISTURBANCE SEE DETAIL 2/C501 \ \ Y
�- �63 l/ \\ 5. CONTRACTOR SHALL APPOINT AN ON -SITE INSPECTOR AND MAINTAIN RECORDS OF INSPECTIONS IN
O ACCORDANCE WITH THE PROVISION OF THE GENERAL NPDES STORMWATER DISCHARGE PERMIT FOR
\\\ �\ CONSTRUCTION ACTIVITIES.
TEMP. SEDIMENT
\ FENCE TYP. \ / I o
( ) r 1 ,p � \�\�� DETAILED CONSTRUCTION SEQUENCE
SEE DETAIL 2/C501
SKIMMER (BASIN I / 1 ' 1 "� °O\� 1. CONSTRUCT THE TEMPORARY SURGE STONE CONSTRUCTION ENTRANCE/EXIT OFF CLARK ROAD.
/
^/ 2. INSTALL SILT FENCE AND STONE OUTLETS FROM CLARK ROAD TO THE SOUTH SIDE OF THE STREAM
\ \ \\ \ ( LOCATED AT 16+87. SILT FENCE TO BE LOCATED ON BOTH SIDES OF THE ROAD AND SOUTH BANKS OF
THE STREAM.
3. INSTALL SKIMMER BASIN 6 AND SKIMMER BASIN 7 AND THEIR ASSOCIATED TEMPORARY DIVERSION
DITCHES AND SLOPE DRAIN (IF CALLED FOR).
SEDIMENT �- -- � / � \ G
�� 4. INSTALL IMPERVIOUS CLEAN WATER DIKE AND BYPASS PUMPING SYSTEM AS SHOWN ON SHEET C402.
JCE (TYP.) \ 6 � / t5� �o, �,\ \\\ INSTALL THE PERMANENT 54" PIPE AND ENDWALLS AT STATION 16+87.
IL 2/C501
1P S 5. APPLY 10" STONE BASE LAYER TO ENTRANCE ROAD AND COMPACT.
06
6'6'�\ \
`6,76. BACKFILL, PREPARE SLOPES AND OTHER DISTURBED AREAS AND STABILIZE.
7. INSTALL SILT FENCE AND STONE OUTLETS ALONG NORTH SIDE OF THE STREAM.
/ / I`� z �� 8. INSTALL SILT FENCE AND STONE OUTLETS AROUND THE EXISTING STREAM BUFFER AND PROPERTY
� BOUNDARY (WHERE DENOTED ON PLANS). INSTALL SKIMMER BASINS 4, 5, 13, 11, 3, 2, 1, 12, 8, AND
I \ \ \ RF \ \T��e�T UU�(/ 10 AND THEIR ASSOCIATED TEMPORARY DIVERSION DITCHES AND SLOPE DRAINS (IF CALLED FOR).
\ 1 \ \ \ \JO\, 9. PLACE ALL SILT FENCE AND STONE OUTLETS DOWN SLOPE OF ALL PROPOSED BERMS.
y 10. BEGIN GRADING THE INITIAL MINE AREA, MOVE AND PLACE MATERIAL FOR BERMS. PLACE AND
J l I \ \SF ��Cj� \ `- �, �J �_ IT�� ✓ ti��j . COMPACT MATERIAL FOR PLANT AND STOCKPILE AREA. ALL BERMS SHALL BE CONSTRUCTED AND
STABILIZED WITHIN 1 YEAR OF STARTING MINING ACTIVITIES.
11. CONSTRUCT TAILINGS PONDS BEFORE MINING OPERATION BEINGS.
C 12. SEED AND MULCH ALL AREAS THAT ARE NOT COVERED WITH ASPHALT OR STONE.
13. STABILIZE ALL CHANNELS AND SLOPES WITH MATTING AS NOTED ON THE PLANS.
\ \ \ \ \ �0 SEEDING NOTE:
R T B� NDA Y \ \ \ \ �\ \ \ \ \ �'A� °� \ SEED MIXTURE, SEEDING RATE, AND SOIL AMENDMENTS TO
/ l BE APPROVED BY AN ENVIRONMENTAL PROFESSIONAL AND
P 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.
100 U lU 1> U N00 I
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© 2019 LaBella Associates
ALAMANCE
AGGREGATES, LLC
Mr. Chad Threatt, VP
Snow Camp Mine
NO: DATE: DESCRIPTION:
REVISIONS
PROJECT NUMBER:
2190335
DRAWN BY: KCG/ATC
REVIEWED BY: PAS
ISSUED FOR:
REVIEW
DATE:
5/28/19
DRAWING NAME
OVERALL
SEDIMENTATION &
EROSION CONTROL
PLAN
DRAWING NUMBER:
C301