20080367 Ver 1_More Info Received_20080605

ATLANTIC PLAN ENGINEERING CORP. 1)00 . 0.3 Lo')
ENGINEERING & PLANNING CONSULTANTS
PHONE: [phone]
P.O. BOX 1691 FAX: [phone]
HICKORY, NC 28603-1691 E-MAIL: [e-mail]
RE: DWQ# 08-0367 June 3, 2008
Watauga County
NC Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
Attn: Sue Homewood
Enclosed is the proposed stormwater managment bioretention area for Mr. Gottfried's project.
If you have any questions, feel free to contact Richard Franklin at [phone], or
[e-mail].
g"ZI
Richard Franklin, PE
NC #028223
oC@[RO) L?g p
cc: Ian McMillan JUN 5 2008
NC Division of Water Quality / 401 Certification Unit DENR-WATER WAUTY
WETLANDS AND STORMWATER BRANCH
ATLANTIC PLAN ENGINEERING CORP.
ENGINEERING & PLANNING CONSULTANTS
P.O. BOX 1691
HICKORY, NC 28603-1691
PHONE: [phone]
FAX: [phone]
E-MAIL: [e-mail]
June 2, 2008
H.C. BBQ
Stormwater bioretention calulations
Area of site to be treated with bioretention area 1.07 acres (46,609.2 sqft). Drainage area above the
bioretention area will be diverted around the bioretention with swales.
Storage volume required for bioretention area (first 1" of run-off)
(46,609.2 sgft)(0.0833') = 3,882.5 tuft
Ponding depth of 9" (0.75') = 5,176.67 sqft needed for the surface area in the bioretention area.
The area located on the site drawing has 7,842 sqft of surface area
Collect the run-off from the developed portion of the site in catch basin/yard inlets, and drainage
pipes.
Place pumps in the lowest catch basin to pump the run-off up into a manifold to distribute the run-off
to the bioretention area. There is a 42' TDH from the pump location to the manifold location.
Run-off from site = (0.85)(7.50)(1.07ac) = 6.82 cfs (3,061 gpm)
There is approximately 3,800 cuft of storage available in the catch basins, and drainage pipes.
Utilizing two "Myers" pumps 4WW100M4-03 with 8" impellers, the run-off can be pumped to the
bioretention area at a rate of 900 gpm @ 42' TDH. (450 gpm per pump)
At the 10 year storm flow, the drainage pipes and catch basins will fill within approximately 10
minutes.
The pumps will be able to empty the draiange pipes and catch basins within approximately 32.5
minutes.
An underdrain will be utilized in the bioretention area, to collect the treated run-off, and divert it to a
cistern (1,500 gallon tank). T_h„,,m will be used to irrigate the landscaping around the buildings.
??Me/. .?i'nrrp??
Richard J. Franklin, P
NC #028223 ?
D J. FPS
6 V09
. / r ~ 1 i i t ~~.,NTI~UL Pr~IVr.L 3J4" STAiNI_ESS
' S?EEL BOL? TNROUGH PIPE ~ k]
CAPPED CLEANOUT ~;1~;;-'
L _ (TYP}CAL) ~ X57 WASHED STON"c J
4" P YARD INLET ETA JDARD sT~I~LESS STEEL GABION
RWG & FRAME HOSE CLAMP COVER FLOA~r sw~TOH RETAINING WALL DlSTRI$U'~ION WALL ~ MANIFOL:?
\ O„ PONDkNG .
28oo.~ao . ~ . , ~ ~ 1 ~ , ~ DIV'~RSION SWAGE
I _ _ ,%ry
OPEN ~ ~ I ~ , f 1 SCH 40 PVC ~ ~ .;~2 _ _
FILL SOIL .MEDIA MIX
2° SCH 40 PVC ~ I 85-~889~ SAND
STAINLESS 1 / r
ST EEL ~ L- ' 'PVC TO 24 STANDARD 8-1,~~ FINES ~ ~ / 3-5~' ORGAPdIC
' LIFT CHAIN ~ ;y : ~ RING & FRAM - 7,67 ~ f~luI,ETENTic~N E
Iv1ANIFOLD
. ---1 WAS~~ED SAND LAYER
1
PUMP N I o 0 I ~ FILTER E ABRIC OVER STONE
2796.75 I FLOAT TRTR AI -1 36 PIPE - ~ - ~ ~ tv.r:S.
a ~
I 1, P P F ~ -20 UM OF _ ~ I „r 12" X57 Wa,,SHEO 5TO~+E
FLOAT RE.E 2793,99
/ .
~ » r ~ ~ - PROPOSEC ~ _T~VJ MYER,~ 4 ~ 4 PVC TO ~ 4" PERFORATED UNDERpRAIN - PROPOSED GRADE ~ / DRAIN:ING TO CISTERN TANK
2793..9 i 41NH1%100M4~-0 5 ~~6 PIPE \ BIORETENTION
" ~ i MANIFOLD ~~ITH 8 IMF ELLERS
. l

~
FLOAT TREE ' 2792.33 ~ 6" PIPE 'IPE
PLAN VIEW --4X5X7,67
SECTION VIEW PRECAST BOX
WITH PUMPS
uB1 W PUMPS
~------TWO "MYERS"
4WHV100M4-03
WITH 8" IMPELLERS
SECTION- DETAIL OF BIOI~ETEI~TION AREA
~ -1_____. - 1
DIVERSION SWALE_~ N.T.S.
r ~
REF TIC, AREA

~ ~
6' COVER ~
~ 2
1500 GALLON TANK-~ . ~ : r~i M ~ ot_D , ~ ~ , ~ ' ~i r ~ i l :'a r~ ~ . ~ _ i
;---u~STR4BUT10 ~ f~10-RETENTIO - REA USED AS CISTERN ~ ~ ~ih E
FOR IRRIGATION CB1 - ~.~-.Y. h_;~:.. , r.,. -~Pif1tL I
RETAINIP ,.~Rr V RET~,i~AIG ~ JG l `4 ~ ~,a ~ _
ST~O RAG E >vAl~. .~.ti ~ Z DUMPSTER --UNDERDR' ~ DUMF'STER
HIN l0 (,ISTERN ~ P1 c p
z Q ~ ~ ~ ; r z _ ~
~
i ~j ~ I ~
~ ~ ~ _ _ GRADE STAKE TO
c6z ~ » SECURE MANIFOLD PIPE 4 PERFORATED PIPE
~ - 1 ti INSTALLED LEVEL
P2 c, ~ ti ~ 1
DISTRIB~1~ ION MANIFOLD .DETAIL
-____.____.y N.T.S.

_ ~ ~ i ~ ~ .
S'RIDGE STRUCTURE ~
~ ~
~ ~ I ~
PLANT SCHEDULE FOR BIORETENTIGN AREA
SHRUBS:
P 3 1 ~ COMMON NAME SCIENTIFIC NAME HEIGHT SPf~!EAD
. ~ 25' ~ CB4 P4 ~ RED CHOk;EBERRY AROP~IIA ARBUTIFOLIA 6'-12'/x'-6' o~
~ FF ~ I f.. R -
AMERICAN FILBERT .,ORYLU ~ AMERICANA 6 -12 /6 -12 J V
W~LL - CB5

HIGHBUSH BLUBERRI' ~ ~ ' ~N5 1pp8 dACCINIUM CORYMBOSUM 6 12 /6 -~12 ~°~-~rF
N w ~ Y ~ 1 GROUND COVER:
3 r__._ 1 \ .
COMMON NAME _ SCIE_N_TIFIC NAME H~:EIGHT/SPFEAD ~ - -
CREEPING BLUE STAR AMSONIA. CIL_IATA 6"/12'
~ SWEET FLAG 4CORUS CALAMUS 1'/-
~
N0. A B C TOP OF INV. Ol)T C~4R BUTTERFLY WEED ASCL.EPI,4S TUBEROSA 20"/- ~
wIOTH FT. LENGTH FT. HEIGHT FT. B0;( ELEV. ~l / i
PIPEPIPE ~ ~ - C61 4 5 7.6, ...800.00 2192.33
N0. SIZE P1 36 CB2 4 5 3.75 '_)797.75 2794,{)0 _ ~ ~ FOUNTAIN GRASS PENNiSETUM SPP. 2'-5'; - d ~
SIZE AT PLANTING 3 GALLON CONTAINERS FOR SHRUBS AND
CB3 4 5 5.50 2800.00 2794.`,10 ~1'"-~ 1 c:~UART CONTAIPERS FOR HERBACEOUS PLANTS 'F
P4 36" C64 4 5 5.50 2802.0 '7 7) 5 2 9 .t 0
R~CHAR - ANKLIN 2" TO 4" MU!_CH LAYER AROUND PLANTS
CB5 4 5 5.50 280?.50 2802.00 " - P SAN S~A~_E 1 - ~0 ~ P.E. NC Q3223
DRAWN BY: ES, PW APPROVED BY: RJF REVISIONS ATLANTIC PLAN ENGINEERING CORP* SHT. NAME SHT. NAME PROJECT SHT. NO.
DATE: 06-02-08 PROJ. NO. - - - P.O. BOX 1691„ HICKORY NC 28603 DRA DRAINAGE & BIQRETENTION DETAILS THE H.C. B'3Q 3
Dwc. NQ.: PROJECT: PHONE: [phone] FAX: [phone]
e-mail atlplan®conninc.com WATAUGA COUNTY, N0RTH CAROLINA