20110281 Ver 1_More Info Received_20110729

ENV
FJy1/ t1@ly C011Sl11t1119 1/Ices Inc.
July 28, 2011
Ms Sue Homewood
NC DENR DWQ
Winston Salem Regional Office
585 Waughtown St.
Winston Salem, NC 27107
RE: Sterling Carroll Nursery Project
Boone, Watauga County, NC
DWQ# 11-0281
Dear Sue:
3764 Rominger Road
Banner Elk, NC 28604
Ph: 828-297-6946
Fax: [phone]
e-mail: johnaenv-ecs.com
-- D
Flu 2 9 2011
R - w TE aunLIrY
WnH..-a_ n w.
Included is a sealed plan sheet for the referenced project showing cross
sectional views and other details for the proposed bioretention area. I am
sending this to you because Annette indicated you would need a copy. This is
the final item she has requested.
If you have any questions regarding this information or need additional
information please call me at 828-297-6946, thank you.
Sincerel ,
J n C. Vilas
President, ENV Environmental Consulting Services Inc.
Cc: Sterling Carroll
Annette Lucas
Mike Trew
ENV file
" VC Non- erForated Stand i e v
3-4" above grade p p p rove reds ~n g
v.u - . r 7e~'~"."1 L'Z'
C Use 45° E and fitting
-1 Grass Pre-freafinentArea 4' Min. or equivalent directional ~ x
Break Line r Section - cleanout to connect ~ ct ;;m~:::':~:::
underdrain to standpipe ~
Overflow Device "~s, ° 7 ~ ~ ~
Box Riser Inlet Elev. 997,60. ®c~ c~,
Elev. 997.75 Elev, 997.00 4" Perforated ~
Elev. 997.5q 4"PVC Capped Underdrain Clean-out Pipe Curb-cut Elev. 999.00 with PVC Screw Gap; 3.4" above mulch layer ~
aterti ht a _ g P _ _ 9Pond~ngDep#h;elev.997.75 ~ SCHD 0 PVC °
SioneB"Thickness _ - - _ On Terminal Urterdrain
- - - ~k o 3"Mulch; elev. 996.75
End of Plpe ' L 3 Soil Media . , , . ~ ~ O
n FescuelBlue rasa Sod Grass - - o a~ : ; ' Pia fed g -"III ( III I I . 85.88 /o Sand _ _ _ ° 0 ~ ..~,..o O ,
I I I &12h Fines -
- I I=~ "-III- - ~ f~l I a 3-5% Or anic - 9 II ~ II -1 - -
~~pi ~ 4" Washed Sand; elev. 993.75 - - - FilterCloth; elev. 993.42 - - - - - - - - - - - - - - - - - - - Compacted Fill ::N: ~
Underdrain Pipe: 4"Schedule (40 perf.) - -
°o °oo - 10" Washed Gravel (#57) Min. 3" above ~ - - _
Underdrain pipe outside bioretentlon cell and an each side o4 underdrain pipe; _ - -
tie iota 6" Schedule non-perforated, bottom elev. 992.5 - - - _ 12" GMP ' ~ +I Riser tie-in Elev. +1.992,0 (0.5% slope) -
(Invert+!-990.5) _
Elev, 990.00
Break Line
Seasonal High Water Table elev. 966.0
~
11 11 ~ ..Q.
®1 SECTI viii.;: C? ;
Ts MaintEtnance Schedule: N schedule:
Pruning 1-2lyear -2/ ear Hi level of nutrients in bioretention area ::::;.ii...o.;,,:,i.; Y g
increases rowth in lanted ve etati®n.
-1 1 ear owlrg 2 2 y -1 /ear les a s . e~w r d onions of swa and b Y g rise Y
Mulch n 1- ear g lY -/year Replace mulch in void areas where mashing has
occurred.
ulch 112-3 ears /2-3 years Balch accumulation reduces water storage
Y
_ Remo ral Grass Pre-treatment Area ~ - 4Min' Break Line 1 ve~lume. Mulch accumulation occurs during ~
Section -A flooding events..
Waterin 112-3 da s g Y /2-3 days First 1- months after planting; followed by
Overflow Device ~I Box Riser Inlet waterin during excessive dry periods. O
Elev. 996.25 v. 995.50 Fertllli:atl®n 1 time Elev. 996AOj Ele 4 PVC Capped Underdrain Clean-ouk Pipe time lntial fertilization during planting of vegetation. ~
Curb-cut Elev. 9137.50 with PVC Screw Cap, 3-4 above mulch layer Dead 1 !year /year pproxim fi ly 1% mortality rate among planted W C.~
_ _ _ _ _ _ _ _ _ _ - _ - _ - _ - - - _ - 9" Ponding Depth; elev. 99625 Material ' material; remove and replace. ~ ~
Ri ra over 2" washed stone - pP - /year Remove trash; spot weeding; cleanout overflow ~
S#one 8"Thickness - `i`` M ISC, year _ _ _ 3 Mulch; elev. 995.25
-I I -I I ~ I I°~ - ~ 3 Soil Media device; cleanout inlet; remove silt and sediment. L.L1 t.~
Planted FescuelBluegrass Sod Grass - I =I~ -I l I"I I ~ l ® - o L - 85 86~Sand Clean~ut 1lyear /year Inspect and perForm cleanout of underdrain. ~ O
f~ -~f 111 -I I - ~ 812% Fmes i - I = I I I"-~ - III ° nic Pi eS
p - -III- l~ - L ~ . < ~t~•, r , ~ 4 Washed Sand; elev. 992.25 ~ ~
~ Filter Cloth; elev. 991.92 CL.
b ~ q' ° Underdrain Pipe: 4" Schedule (40 perf.} o"aoo'ooo~°oaoo
10" Washed Gravel (#67} Min. 3"above 'I ~ I A ~ ~ i
Underdrain pipe outside bioretentian cell and on each side of underdrain pipe; „ tie into 6"Schedule non-perforated. bottom elev. 991.0
12 CMP Riser tie-m Elev. +1.990.50 (0.5 %a slope) ~ a~
(Invert +/-989.00) Elev. 988.50
~ ~
Break Line Seasonal High Water Table elev. 966.0 Q
10.5' MIN. ' ~
® SECTI " Q
NTS °
- ~C
FREE BOARD ~ ~
3°1 3;1 1.5' MIN. 3' 1 DEPTH
dge of building
Sod Buffer
Curb Flow 'a., a

• Sod Buffer ~ g- F1NISHD GRADE p ~r DE 2' MIN. t~
'd j Z
° F
Ca ed Cleanout Pi Max. Ponding PR Pe Water Depth (9")
0
3,1 Max (Typical) ~ s• i
' • Mulch Layer - - 3;1 Max T ical i
- - x•''• - - a ~ -
. e - - = SWALE SWALE FLOW DEPTH FREE Et~ARD
Q . ~
- - 3 Soil Media 1 - - - 1 :0.93' 0.5T~
- - - - - ~ • ~o' Z
Buildin = - = g - 0.74' 0.76'
Foundation - - ~ 3 1.00' o.5o'i C~
- - - 4" washed sand m ~
Filter clod
0000000 0000 oooa0o0ooaoo „ 000000000000000 000000000 000000 0 0 0 0 10 washed gravel and
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 underdrain pipes ~ ~I
NOTE: S1 NOTE: SWALE SHALL EE LINED WITH NORTH
AMERICA AMERICAN GI;tEE SC-150 EROSION CONTROL MATTING +++"~e"itrip,,i
OR APPR ioretention Cell OR APPROVED EQUAL.. SWALE SHALL HAVE AiMINIMUM .,•C scAt.E: rvrs g` ° ~4dFF.~~QNs*,,m DATE: 6-f-11
1%ANDh 1®IO AND MAJCIMUM 5°fa GRADE. t ® ORwN. 6Y: AJC
(Min. 10 wide) ~ CHKD. BY: MP7
PRO~CT NUMBER
'r Ir 1
NTS NTH ®'®®®t `til+®®°® DRaw~NG No. sf+~r No.