20140843 Ver 1_STORM WATER PLAN SW3 July 2015 Revised_20150712

DocuSign Envelope ID: 46DF0602- D1CA- 4B9A- 9FFD- 4F9AE6E9BO44
d:
OVERFLOW ELEVATION\
THICKNESS ('d') = 1,5 X MAX ROCK DIAMETER - 6" MIN
SE ❑TI ❑N A -A
05 X D MIN _ _ '- La-6 x D MIN
A�
PLAN
NOTES:
L La - LENGTH OE APRON DISTANCE La SHALL BE OE SUFFICIENT LENGTH TO DISSIPATE
ENERGY,
2. APRON SHALL BE SET AT ZERO GRADE AND ALIGNED STRAIGHT.
3, FILTER MATERIAL SHALL BE FILTER FABRIC OR 6" THICK MINIMUM GRADED GRAVEL LAYER,
(ET)
PIPE
Q
z
CULVERT SIZE
15
18
24 30
(IN)
Q
5
12,00
APRON WIDTH
S,0
&0
0
z
(ET)
3 0.35
0.107
0.86
TOP ELEV 2585
J
w
TOP ELEV 2584
INLET CULVERT
(FT)
5 0.35
BOTTOM ELEV 25816
0.75
Q BOTTOM ELEV 258025
BASIN #2 ELEV 2577,34
6
6 6
THICKNESS (IN)
1 0.95
EXTEND 24" CULVERT 192'
0.99
ING ELEVATION
4
6
10 16
27
OUTLET INTO WETLAND
0.107
0.86
0.087
4 0.95
21 1 92
ELEV 2576
0.109
5 0.95
EXISTING 24' CULVERT
0.75
0.076
INLET CULVERT
4
less than 2581
operating volume
2007
2581
BASIN #3 ELEV 2576,74
3272
�=
10.0
1. Obtain Erosion Control Permit and other applicable permits prior to the start of grading.
5390
�j1,0
freeboard
5279
24" CULVERT ELEVATI ❑N
DETAIL
'' 1.0
�I
_
- '%
4. Stake area around remaining wetland for perimeter protection fence.
0.5
_J1.
Cumulative Volume (cf)
during the remainder of the year. The Engineer will determine the exact dates for
2.0
a
d ° A
a
'
0
within the wetland boundary that is not to be disturbed.
0, 5 l�
0
..4
4. Install silt fence at all locations shown on plan sheet. Silt fence shall be manually installed along the
5
outside of the 10 foot wetland buffer.
1806
1806
Fertilizer used for pdres shall be 16-8 -8 grade and shall be applied at the
5. Layout the areas for the construction of the temporary skimmer basins.
--2,0
5108
6. Construct the temporary skimmer basins to the appropriate dimensions. Construct the baffles in the
0
5108
05 X D MIN _ _ '- La-6 x D MIN
A�
PLAN
NOTES:
L La - LENGTH OE APRON DISTANCE La SHALL BE OE SUFFICIENT LENGTH TO DISSIPATE
ENERGY,
2. APRON SHALL BE SET AT ZERO GRADE AND ALIGNED STRAIGHT.
3, FILTER MATERIAL SHALL BE FILTER FABRIC OR 6" THICK MINIMUM GRADED GRAVEL LAYER,
FILTER
BLANKET (SY)
ENEREY ❑CSIPAT ❑P AT PIPE ❑CLET
)KUSE WITH BASIN #1, #2 & #3
WEIR L-❑❑H
DRAINAGE AREA WEIR LENGTH
(ACRES)
(ET)
PIPE
4,00
CULVERT SIZE
15
18
24 30
(IN)
10,00
5
12,00
APRON WIDTH
S,0
&0
8 10
(ET)
3 0.35
0.107
0.86
APRON LENGTH
7.50
9
12 15
(FT)
5 0.35
0.107
0.75
RIP RAP STONE
6
6
6 6
THICKNESS (IN)
1 0.95
0.107
0.99
SYNTHETIC
4
6
10 16
FILTER
BLANKET (SY)
ENEREY ❑CSIPAT ❑P AT PIPE ❑CLET
)KUSE WITH BASIN #1, #2 & #3
WEIR L-❑❑H
DRAINAGE AREA WEIR LENGTH
(ACRES)
(ET)
1
4,00
2
6,00
3
8,00
4
10,00
5
12,00
PR ❑CI C VCW
OVERFILL
TRUCTURAL STONE 6'
FOR SETTLEMENT EMERGENGY BY -PASS
EL0W SETTLED TOP OF
MAX FILL nWEIR 5'
nLENGT
PLUS 5 FEET
ATURAL GROUND
OR POOR DEFINED CHANNELS
)KUSE WITH BASIN #4
CROSS SCCTI❑❑
BYPASS WEIR
fA
2'
LEVEL SPREADER DETAIL
BLIND SWALE DETAIL
ROADWAY SCHEDULE
U EXISTING GROUND
A 3' SF 95B
C GABION BASKET WALL
B 8' I -190B
D 12" ABC
CENTER OF
ROADWAY
9' 9
PARKING PARKING
LOT Vp in /ft LOT
Stabilization Requirements: ) B DO 0/
0
Stabilization for this project shall comply with the time frame guidelines as
j�
30 7-:1 1 r4. 0 - - 7.5 specified by the NCG- 010000 general construction permit effective August 3,
2011 issued by the North Carolina Department of Environment and Natural
Resources Division of Water Quality. Temporary or permanent ground cover STATI ❑NS 0 +00 TO 2 +00
#57 S T ❑ N E stabilization shall occur within 7 calendar days from the last land- disturbing
�-B L I N D S W A E E activity, with the following exceptions in which temporary or permanent ground
FROM B M P cover shall be provided in 14 calendar days from the last land- disturbing activity:
7 �j �� �� • Slopes between 2:1 and 3:1, with a slope length of 10 ft. or less
�� • Slopes 3:1 or flatter, with a slope of length of 50 ft. or less
• Slopes 4:1 or flatter
CENTER of
ENERGY
ROADWAY
DISSIPATER SEEDING AND MULCHING:
-LEVEL The kinds of seed and fertilizer, and the rates of application of seed, fertilizer, and
5' 2.5' 9' 9'
limestone, shall be as stated below. During periods of overlapping dates, the kind
SPREADER of seed to be used shall be determined. All rates are in pounds per acre.
VEGETATED FILTER STRIP _V, = /ft
August 1 - June 1 May 1 - September 1� = - NATURAL
100# Tall Fescue 100# Tall Fescue f< GROUND /GRASS
15# Kentucky Bluegrass 15# Kentucky Bluegrass F5
30# Hard Fescue 30# Hard Fescue A ® Q 0
25# Rye Grain 10# German or Browntop
3RASS
Millet SHOULDER
500# Fertilizer 500# Fertilizer
4000# Limestone 4000# Limestone
VEGETATIVE FILTER STRIP /LEVEL Approved Tall Fescue Cultivars STATIONS 2 +00 TO 4 +75
SPREADER CRESS SECTION 2nd Millennium; Duster; Magellan; Rendition; Avenger; Endeavor; Masterpiece;
Scorpion; Barlexas; Escalade; Matador; Shelby; Barlexas II; Falcon II, III, IV &
V; Matador GT; Signia Barrera; Fidelity; Millennium; Silverstar; Barrington;
F' II M k S h Ch ' II B 1 F' b' A AA 3 S
GABION BASKET WALL
Description
Construct a gabion basket wall to the dimensions shown on the
plans.
Materials
Galvanized steel baskets ASTM standard A1057/A1057M
Washed Stone ASTM C615/C615M
Rip Rap ASTM C615/C615M
Construction Methods
Grade a 5' wide area for the foundation stone. Place 6 -8" of
washed stone as the wall foundation. Construct baskets to a
dimension of 4 feet wide by 5 feet deep by the specified length.
Fill baskets with 6" nominal size rip rap; arranging the rip rap to
minimize voids. Secure the baskets with galvanized steel wire.
Stack baskets to the specified height offsetting each subsequent
row by 1 Y2 '. Backfill with 6" of stone.
Peak Flow Calculations
1 year 24 hour storm
Q =C )KI )KA
Drainage
Area
4.0
11 (in /hr)
JA (acres)
IQ(cfs)
Pre Development
(�
0,5
4:j
1 0.35
Ati
0.99
BLIND SWALE DETAIL
ROADWAY SCHEDULE
U EXISTING GROUND
A 3' SF 95B
C GABION BASKET WALL
B 8' I -190B
D 12" ABC
CENTER OF
ROADWAY
9' 9
PARKING PARKING
LOT Vp in /ft LOT
Stabilization Requirements: ) B DO 0/
0
Stabilization for this project shall comply with the time frame guidelines as
j�
30 7-:1 1 r4. 0 - - 7.5 specified by the NCG- 010000 general construction permit effective August 3,
2011 issued by the North Carolina Department of Environment and Natural
Resources Division of Water Quality. Temporary or permanent ground cover STATI ❑NS 0 +00 TO 2 +00
#57 S T ❑ N E stabilization shall occur within 7 calendar days from the last land- disturbing
�-B L I N D S W A E E activity, with the following exceptions in which temporary or permanent ground
FROM B M P cover shall be provided in 14 calendar days from the last land- disturbing activity:
7 �j �� �� • Slopes between 2:1 and 3:1, with a slope length of 10 ft. or less
�� • Slopes 3:1 or flatter, with a slope of length of 50 ft. or less
• Slopes 4:1 or flatter
CENTER of
ENERGY
ROADWAY
DISSIPATER SEEDING AND MULCHING:
-LEVEL The kinds of seed and fertilizer, and the rates of application of seed, fertilizer, and
5' 2.5' 9' 9'
limestone, shall be as stated below. During periods of overlapping dates, the kind
SPREADER of seed to be used shall be determined. All rates are in pounds per acre.
VEGETATED FILTER STRIP _V, = /ft
August 1 - June 1 May 1 - September 1� = - NATURAL
100# Tall Fescue 100# Tall Fescue f< GROUND /GRASS
15# Kentucky Bluegrass 15# Kentucky Bluegrass F5
30# Hard Fescue 30# Hard Fescue A ® Q 0
25# Rye Grain 10# German or Browntop
3RASS
Millet SHOULDER
500# Fertilizer 500# Fertilizer
4000# Limestone 4000# Limestone
VEGETATIVE FILTER STRIP /LEVEL Approved Tall Fescue Cultivars STATIONS 2 +00 TO 4 +75
SPREADER CRESS SECTION 2nd Millennium; Duster; Magellan; Rendition; Avenger; Endeavor; Masterpiece;
Scorpion; Barlexas; Escalade; Matador; Shelby; Barlexas II; Falcon II, III, IV &
V; Matador GT; Signia Barrera; Fidelity; Millennium; Silverstar; Barrington;
F' II M k S h Ch ' II B 1 F' b' A AA 3 S
GABION BASKET WALL
Description
Construct a gabion basket wall to the dimensions shown on the
plans.
Materials
Galvanized steel baskets ASTM standard A1057/A1057M
Washed Stone ASTM C615/C615M
Rip Rap ASTM C615/C615M
Construction Methods
Grade a 5' wide area for the foundation stone. Place 6 -8" of
washed stone as the wall foundation. Construct baskets to a
dimension of 4 feet wide by 5 feet deep by the specified length.
Fill baskets with 6" nominal size rip rap; arranging the rip rap to
minimize voids. Secure the baskets with galvanized steel wire.
Stack baskets to the specified height offsetting each subsequent
row by 1 Y2 '. Backfill with 6" of stone.
Peak Flow Calculations
1 year 24 hour storm
Q =C )KI )KA
Drainage
Area
1C
11 (in /hr)
JA (acres)
IQ(cfs)
Pre Development
(�
2580
4093
1 0.35
0.107
0.99
0.037
2 0.35
0.107
1.2
0.045
3 0.35
0.107
0.86
0.032
4 0.35
0.107
1.07
0.040
5 0.35
0.107
0.75
0.028
Post Development
Chariot; Nordic; Rhino; Warwick; Firefly; Oxford; Scaldis 11; Heron; Reliant 1I;
Y; >
over 2581
freeboard
1 0.95
0.107
0.99
0.101
2 0.95
0.107
1.2
0.122
3 0.95
0.107
0.86
0.087
4 0.95
0.107
1.07
0.109
5 0.95
0.107
0.75
0.076
Runoff Volume Calcu(ations:
Rv= 0.05 +0,9 )KIa
V= 3630wRdwRvwA
Dry Detention Basins
NOTES: messe , on an , out ern oice , i tmore; >re it , us tang , tetson;
1, THE TOPSOIL IN THE VEGETATIVE FILTER STRIP MUST BE Bingo; Focus; Olympic Gold; Tarheel; Bravo; Grande II; Padre; Titan Ltd; CENTER OF
AMENDED WITH LIME AND ORGANIC MATTER, SELECT GRASSES Cayenne; Greenkeeper; Paraiso; Titanium; Chapel Hill; Greystone; Picasso; ROADWAY
FROM STABILIZATION TABLE ❑N SHEET SW -3. Tomahawk; Chesapeake; Inferno; Piedmont; Tacer; Constitution; Justice; Pure
2. ENERGY DISSIPATER AT BASIN #1 IS OVERSIZED T ❑ Gold; Trooper; Chipper; Jaguar 3; Prospect; Turbo Coronado; Kalahari; Quest; 9' 9'
UNIFORMLY C ❑ N N E C T T ❑ LEVEL SPREADER. Ultimate; Coyote; Kentucky 31; Rebel Exeda; Watchdog; Davinci; Kitty Hawk; GRASS GRASS
Rebel Sentry; Wolfpack; Dynasty; Kitty Hawk 2000; Regiment II; Dominion; SHOULDER SHOULDER
3, PROVIDE AN IMPERVIOUS FILTER BARRIER UNDER BASINS � t
WHERE THE SHWT IS WITHIN 2 FEET OF THE BOTTOM Lexington; Rembrandt
ELEVATI ❑N,
Stage Storage Volume Calculation Table
Drainage Area
Elevation
Surface Area (sf)
1
less than 2580
operating volume
(�
2580
4093
Ld
� Z 00
2581
5111
3.33 I 15 I 0.25
over 2581
freeboard
(Drainage Area
Elevation
Surface Area (sf)
2
less than 2579
operating volume
0
2579
1456
0
2580
2558
>
2581
3986
Chariot; Nordic; Rhino; Warwick; Firefly; Oxford; Scaldis 11; Heron; Reliant 1I;
Y; >
over 2581
freeboard
(Drainage Area
Elevation
Surface Area (sf)
3
less than 2579
operating volume
K , t (days)
2579
1175
used provided the 1 -2 -2 ratio is maintained and the rate of application adjusted to
2580
2437
0
2581
4167
0
over 2581
freeboard
(Drainage Area
Elevation
Surface Area (sf)
4
less than 2581
operating volume
2007
2581
3626
3272
2582
4472
1. Obtain Erosion Control Permit and other applicable permits prior to the start of grading.
2583
5390
over 2583
freeboard
25%
Drainage Sediment V (cu ft) V (cu ft)
Area la Rv Rd A (acres) V (cu ft) Storage needed provided
2 0.91 0.87 1 1.2 3779 945 4724 5279
3 0.92 0.88 1 0.86 2737 684 3421 5108
Bioretention
Drainage
Area la Rv Rd
1 0.89 0.85 1
4 0.70 0.68 1
*soil type DsC, DiUslooro Loam
Ponding Required
Depth, Surface Ksat* Drawdown
A (acres) V (cu ft) inches Area (in /hr) , t (hours)
0.99 3066 9 4088 0.75 12
1.07 2644 9 3526 0.75 12
Emergency Outlet Q
Q= CwwLwH ^1.5
13'x3' box
Cw L crest H (ft)
Q(cfs)
Approved Kentucky Bluegrass Cultivars:
CD
U q LO
3.33 1 8 0.3
4.4
(�
O ® p
(Overflow Structure
Ld
� Z 00
Alpine; Bariris; Envicta; Rugby; Apollo; Bedazzled; Impact; Rugby II; Arcadia;
O/
3.33 I 15 I 0.25
6.2
Bordeaux; Kenblue; Showcase; Arrow; Champagne; Midnight; Sonoma; Award;
�2:\
Incremental Volume (cf)
Cumulative Volume (cf)
Chicago II; Midnight II
4r1 A'1 it
0
0
Approved Hard Fescue Cultivars:
0
0
>
4602
4602
Chariot; Nordic; Rhino; Warwick; Firefly; Oxford; Scaldis 11; Heron; Reliant 1I;
Y; >
STATI ❑NS 4 +75 TO 6 +70
0
4602
Spartan II; Minotaur; Reliant IV; Stonehenge
Drawdown OVERFLOW DITCH
Area (sf) c
g (fps)
Fertilizer shall be 10 -20 -20 analysis. A different analysis of fertilizer may be
K , t (days)
Incremental Volume (cf)
Cumulative Volume (cf)
used provided the 1 -2 -2 ratio is maintained and the rate of application adjusted to
1.02893E -05 3.1
0
0
provide the same amount of plant food as a 10 -20 -20 analysis and as directed.
9.84233E -06 3.3
0
0
CONSTRUCTION SCHEDULE
TEMPORARY SEEDING:
2007
2007
3272
5279
Fertilizer shall be the same analysis as specified for Seeding and Mulching and
1. Obtain Erosion Control Permit and other applicable permits prior to the start of grading.
2. Install rain gauge in an accessible area. Dedicate a log book to record rain events and weekly inspections.
0
5279
applied at the rate of 400 pounds and seeded at the rate of 50 pounds per acre.
3. Maintain the temporary gravel construction entrance from phase I.
German Millet, or Browntop Millet shall be used in summer months and rye grain
4. Stake area around remaining wetland for perimeter protection fence.
Incremental Volume (cf)
Cumulative Volume (cf)
during the remainder of the year. The Engineer will determine the exact dates for
3. Manually nstall a perimeter protection fence around the delineated wetland. No equipment is allowed
y P P
0
0
using each kind of seed.
within the wetland boundary that is not to be disturbed.
0
0
4. Install silt fence at all locations shown on plan sheet. Silt fence shall be manually installed along the
FERTILIZER TOPDRESSING:
outside of the 10 foot wetland buffer.
1806
1806
Fertilizer used for pdres shall be 16-8 -8 grade and shall be applied at the
5. Layout the areas for the construction of the temporary skimmer basins.
3302
5108
6. Construct the temporary skimmer basins to the appropriate dimensions. Construct the baffles in the
0
5108
s acre.
rate of 500 pounds per acre. A different analysis of fertilizer may be used
temporary skimmer basins.
provided the 2-1-1 ratio f maintained and the rate of application adjusted to
7. Establish temporary cover according to stabilization table schedule and the seeding schedule on ECP 2.
Incremental Volume (cf)
Cumulative Volume (cf)
Provide the same amount of plant food as 16 -8 -8 analysis and as directed.
8. Seed, fertilize and mulch all exposed areas using the seeding schedule included on ECP2, adjusting to the
0
0
SUPPLEMENTAL SEEDING:
schedule for the season. All disturbed areas should be treated with ground cover within 7 to 14 calendar
days of completion of grading activities according to the stabilization table on ECP 2.
0
0
The kinds of seed and proportions shall be the same as specified for Seeding and
9. Once grading is complete, install temporary silt fence around permanent drainage easement.
4049
4049
Mulching, and the rate of application may vary from 25# to 75# per acre. The
10. Stabilize drainage area #2 and #3 prior to construction of the dry detention basin. Construct storm
4931
8980
actual rate per acre will be determined prior to the time of topdressing and the
Water basins and outlet structures.
0
8980
Contractor will be notified in writing of the rate per acre, total quantity needed,
11. Seed and fertilize areas. Stabilize drainage area #1 and #4 prior to construction of the bioretention cell.
and areas on which to apply the supplemental seed. Minimum tillage equipment,
12. Construct bioretention cell. Cover with sod as specified.
consisting of a sod seeder shall be used for incorporating seed into the soil as to
13. Re -seed and fertilize areas as needed.
prevent disturbance of existing vegetation. A clodbuster (ball and chain) may be
14. Once vegetation has been established, remove all temporary erosion control devices.
used where degree of slope prevents the use of a sod seeder.
MOWING:
The minimum mowing height on this project shall be six inches.
Emergency Outlet Q
Q= CwwLwH ^1.5
13'x3' box
Cw L crest H (ft)
Q(cfs)
z�
H
CD
U q LO
3.33 1 8 0.3
4.4
(�
(Overflow Structure
Ld
� Z 00
A
� Q
LD U
3.33 I 15 I 0.25
6.2
-
d=
�2:\
Orifice Outlet Drawdown
Time
//��
4r1 A'1 it
1,25 "diameter orifice
Z�
� 't
oz�
Q= CdwAwsgrt(2wgwH)
�OW03
>
Basin
Orifice
Drainage Area, A
Ld
Area, a
Drawdown OVERFLOW DITCH
Area (sf) c
g (fps)
(sf)
K , t (days)
2 3986 0.6
32.2
0.008518
1.02893E -05 3.1
3 4167 0.6
32.2
0.008518
9.84233E -06 3.3
)KUse with Drainage Area #4
SW 3
7 -12 -15 ADD
PIPE DETAIL
C
ESSIp/,'4
S.
SEAL
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7/12/2015
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COUNTY: HAYW❑ ❑D
TOWNSHIP:
WAYNESVILLE
WATERSHED:
FRENCH BROAD
SCALE:
INSERTS: 1 " =30'
IJL I AILJ: N I J
U
CD
1,.D
all r
I o
o
LJJ
�I Q
`p Q Lei
J J
oz�
D
�OW03
>
#Ln_J
Ld
H 0
COUNTY: HAYW❑ ❑D
TOWNSHIP:
WAYNESVILLE
WATERSHED:
FRENCH BROAD
SCALE:
INSERTS: 1 " =30'
IJL I AILJ: N I J