20080793 Ver 1_More Info Received_20081020

[Fwd: BREMCO] - for file 08-0793
https://webmai l.ncmai I.net/cp/ps/Mai I/ViewMsgControl ler?d=ncmai I
From: Sue Homewood [Sue. [e-mail]]
Date: Oct 20, 2008 9:55 AM
To: "Bev Strickland"<Bev. Strickland @ncmail. net>
Cc:
Subject: [Fwd: BREMCO] - for file 08-0793
Attachments: BC(9.0) Pond Revised-Model.pdf (872 KB)
®Supplement_WetPond-Rev.4_Locked.pdf (314 KB)
-------- Original Message --------
Subject:BREMCO
Date:Mon, 20 Oct 2008 09:08:01 -0400
From:Miles Wright <[e-mail]>
Reply-To:<[e-mail]>
Organization:Wright & Associates
To:'Sue Homewood' <[e-mail]>
Sue,
Attached is the revised Supplement Form for BREMCO.
I have revised the elevations on the form to match what
Is on the plans.
I added a diversion ditch above the pond on the revised plans that was
Not on the previous plan. This diverts some of the area that was draining
To the pond around the pond. This reduced the drainage area as indicated
On the Supplement Form. I had shown this on the grading plan but did not
Have it shown on the pond plan. I have attached a revised pond plan with
This diversion shown.
I have also shown on the attached pond plan a note stating that all areas above
The permanent pool elevation of the pond be planted with either grass or other
Permanent plantings.
Should you need any further information, please do not hesitate to contact me.
Thank you.
Miles A. Wright, PE
1 of 2 10/20/2008 10:55 AM
[Fwd: BREMCO] - for file 08-0793
Wright & Associates
4190 Hwy 16 South
Newton, NC 28658
[phone] (Voice)
[phone] (Fax)
[e-mail]
Sue Homewood
NC DENR Winston-Salem Regional Office
Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
FAX: [phone]
https://webmail.ncmail.net/cp/ps/Mail/ViewMsgController?d=ncmail....
2 of 2 10/20/2008 10:55 AM
Permit No.
(to be provided by DWQ)
. - ..:...:..: :.......
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
DETENTION WET BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information.
I. PROJECT INFORMATION
Project name BBEf,1C _i
Contact person ivliles A Wright FE
Phone number 828-465-2205
Date 8/26/2008
Drainage area number 1
II. DESIGN INFORMATION
Site Characteristics
Drainage area 502.809.00 ftz
Impervious area 315.810.00 ftz
% impervious 62.81 %
Design rainfall depth 1.00 in
Storage Volume: Non-SR Waters
Minimum volume required ft3
Volume provided ft3
Storage Volume: SR Waters
1-yr, 24-hr runoff depth 2.98 in
Pre-development 1-yr, 24-hr runoff 5.463.00 ft3
Post-development 1-yr, 24-hr runoff 26.503.00 ft3
Minimum volume required 21.040.00 ft3
Volume provided 63.473.00 ft3
Peak Flow Calculations
1-yr, 24-hr rainfall depth 2.98 in
Rational C, pre-development 0.70 (unitless)
Rational C, post-development 0.90 (unitless)
Rainfall intensity: 1-yr, 24-hr storm 0.36 in/hr
Pre-development 1-yr, 24-hr peak flow 2.14 ft3/sec
Post-development 1-yr, 24-hr peak flow 2.76 ft3/sec
Pre/Post 1-yr, 24-hr peak flow control 0.62 ft3/sec
Basin Elevations
Basin bottom elevation 962.00 ft
Sediment cleanout elevation 965.00 ft
Bottom of shelf elevation 967.00 ft
Permanent pool elevation 967.50 ft
SHWT elevation 967.50 ft
Top of shelf elevation 968.00 ft
Temporary pool elevation 968.31 ft
Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 2
Permit No
(to be provided by DWQ)
II. DESIGN INFORMATION
Volume and Surface Area Calculations
SA/DA ratio 2.80 (unitless)
Surface area at the bottom of shelf 13.452.00 ftz
Volume at the bottom of shelf 50.887.00 ft3
Permanent pool, surface area required 14.078.00 ftz
Permanent pool, surface area provided 16.188.00 ftz GK
Permanent pool volume 66.054.00 ft3
Average depth for SA/DA tables 4.08 ft
Surface area at the top of shelf 20.454.00 ftz
Volume at the top of shelf 84.721.00 ft3
Forebay volume 12.356.00 ft3
Forebay % of permanent pool volume 18.71 %
Temporary pool, surface area provided 24.691.00 ftz
Drawdown Calculations
Treatment volume drawdown time 3.90 days OK
Treatment volume discharge rate 0.09 ft3/s
Pre-development 1-yr, 24-hr discharge 10.62 ft3/s
Post-development 1-yr, 24-hr discharge 2.40 ft3/s 1
Additional Information
Diameter of orifice 1.5 in
Design TSS removal 90 %
Basin side slopes 3.00 1
Vegetated shelf slope 10.00 1
Vegetated shelf width 10.00 ft
Length of flowpath to width ratio 3.00 1
Length to width ratio 3.00 1
Trash rack for overflow & orifice? Y (Y or N)
Freeboard provided 2.50 ft
Vegetated filter provided? N (Y or N)
Recorded drainage easement provided? Y (Y or N)
Capures all runoff at ultimate build-out? Y (Y or N)
Drain mechanism for maintenance or emergencies 12" SLUICE GATE

Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 2 of 2
~ ~ f 0' BUFFS f0' BUFFE 10' SAFETY ~
A A~ BENCH 10' LITTORAL t` }7 1 I r' 4 ` l
~ ~ ~ ~ ~ ~ ~ ~0 ~ , ~ A .o 0,0
. A ~ ~ ~ ~ ~.A ~ ~ ~ A ~ \ ~ ~0 C1~ SHELF
\ ~ ~ ~ ~ F ~ ~ ~ ~ ~ A OF PERMANENTSTATIC POOL ELEV=968.00 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~ ~ \ ~ \ .A` ~ , TOP OF BERM poet ova Bart ~9
~.A ~ ~ ~ ~ 96700 ~ self 6h+LEt>011V
\ ~ ~ _ ~ ~9~ IIOldl di01~t s8601
~ ~ ~ ~ ~ ~ SEDIMENT FOREBAY ~oe`~y
~ ~ ~ 5 P~~ - 33403
1 \ ~ ~ ,ti ~ ~ _ ~ 0 0`` POND t~ -ebes~cbea-srcbi~cte,omn ~ /SEDIMENT CLEANOUT BENCHMARK
1 ~ ~ ~ ~ A ~~o / TOP OF POLE = 966.00 ~1 WEIR CORE TO BE w F~ 95% COMPACTED CLAY
~ ~ ~ L 1 ~ ~ OBTAIN MATERIAL ON SITE 0
~ ~ AS DESIGNATED BY ENGINEER
1 . ~ ~ BOTTOM ELEV= 964.OD o _ _ _ CONSULTANTS
~ ~ ~ - J ~ ~ ~ ~ ~ , ` ~ _ ~ AFTER CONSTRUCTION 1S COMPLETED,
BASIN TO BE CLEANED OUT TO ELEVATIONS LINER - 12" MIN. THICKNESS
` ~ SHOWN ON THIS PLAN PRIOR TO BEING USED iDO~ COMPACTED CLAY ?4, TAYEOR ~ 1/OEA OBTAIN MATERIAL ON SITE CDR STRUCTURAE ENGINEERS
~ ~ ~ ~ ~ AS A DETENTION BASIN. AS DESIGNATED BY ENGINEER giygCF
~ ~ ~ ~ ti ~'~°F HICKORY, N.C.
~ ~ , ~ , ALL DISTURBED AREAS ABODE THE PERMANENT r
~ \ WATER SURFACE ELEVATION SHALL BE EITHER
~ \ ~ ~ GRASSED OR PLANTED WITH OTHER PERMANENT PLANTINGS ~ T PLANTINGS SECTION A-A AT FOREBAY ~TTDM BRITTAIN ENGINEERING
NOT TO SCALE ELEV= 962. DO PEUMB'GMECHANCAE &
\ ~ ~ ~ SEDIMENT CLEANOUT BENCHMARK E EE ~ TR C A E ENGINEER S
~ ~ ~ ~ . ~ ~ TOP OF POLE = 965.Ot CHAREOTTE, N.Ce
~

~ ~ . ~ ~ ~ i. ROUTINE MAINTENANCE IS VITAL TD THE OPERATION OF THE WET DETENTION BASIN. NO TWO WR G H T A S S ~ C A TE S PONDS ARE 7Hf SAME, BUT EVERY POND WILL REQUIRE MAINTENANCE AT SOME POINT, AND
I ~ ~ THEIR MAINTENANCE NEEDS WILL VARY WITH THE SIZE, TYPE OF WATERSHED, LOCATION, ETC. C V ~ ENGINEER S
~ , ~ ~ A. 2. ADEQUATE FUNDING IS ONE OF THE MOST IMPORTANT FACTORS IN A SUCCESSFUL OPERATION NEWTON , N . C. AND MAINTENANCE PROGRAM.
I ~ ~ . ~ ~ ~ ~ 3. DESIGNATION OF A RESPONSIBLE PARTY IS IMPORTANT TO ASSURE INSPECTION AND MAINTENANCE. 4. ESTIMATED ANNUAL OPERATION AND MAINTENANCE (O&M) COSTS FOR WET DETENTION BASINS OF
I - ~ ~ ~ ~ ~ ~ ~ ' 5% OF CONSTRUCTION COSTS WERE FOUND IN A SURVEY CONDUCTED BY THE STATE Of MARYLAND ON THEIR WET DETENTION BASINS. IN ADD1110N THE NURP STllDY IN WASHINGTON D.C., ESTIMATED
~ ~ ~ ~ ~ ~ 0&M COSTS TO BE 5% OF CONSTRUCTION COSTS. 5. A STUDY OF MARYLAND BASINS FOUND THAT, IN GENERAL, PEOPLE HAD MORE FAVORABLE IMPRESSIONS
~ ~ ~ OF WET DETENTION BASINS, WERE LESS LIKELY TO THROW LITTER IN TERM, AND WERE MORE LIKELY
~ ~ , TD CLEAN AND PERFORM ROUTINE MAINTENANCE ON THESE BASINS WHEN THEY WERE PROVIDED A PROMINENT POSITION IN THE DEVELOPMENT.
~ 6. A PERMANENT EASEMENT MUST BE PROVIDED TO ASSURE EASY ACCESS FOR MAINTENANCE. CARE SHOULD BE TAKEN TO SECURE ALL APPROPRIATE LEGAL AGREEMENTS FOR THE EASEMENT
~ , 7. A BENCHMARK FOR SEDIMENT REMOVAL SHOULD BE ESTABLISHED TO ASSURE ADEQUATE STORAGE FOR WATER QUALITY AND FLOOD CONTROL FUNCTIONS.
, 8. THE MAINTENANCE NEEDS Of ANY PARTICULAR WET POND ARf HIGHLY DEPENDENT ON THE CONDITION
J~ ~ ~.A OF THE WATERSHED THAT CONTRIBUTES RUNOFF TO THE POND. MAINTENANCE SHOULD ALWAYS INCLUDE MINIMIZING EROSION PROBLEMS AND POLLUTANT EXPORT TO THE POND FROM THE CONTRIBUTING WATERSHED.
~ ~ ~ . ~ 9. AGAIN, ONE MUST REMEMBER THAT WHILE GENERAL MAINTENANCE TASKS ARE IDENTIFIED HERE, ACTUAL NEED WILL VARY FROM SITE TO SITE. IN GENERAL, PLANS MUST INDICATE WHAT OPERA110N AND MAINTENANCE
ACTIONS ARE NEEDED, WHAT CRITERIA WILL BE USED TO DETERMINE WHEN THESE ACTIONS ARE NECESSARY, AND WHO IS RESPONSIBLE FOR THESE ACTIONS. EXAMPLES OF ITEMS THAT SHOULD BE INCLUDED ON AN OPERATION AND
~ ~ ~ I ~ ~ ~ v ~ MAINTENANCE PLAN INCLUDE, BUT ARE NOT LIMITED 10 THE FOLLOWING.
~ ~ A. DEBRIS AND LITTER CONTROL CHECKS FOR INLET, OUTLET AND ORIFICE OBSTRUCTION AFTER EVERY STORM PRODUCING RUNOFF.
~ ~ B. PROVISIONS FOR ROUTINE VEGETATION MANAGEMENT/ MOWING ANO A SCHEDULE FOR THESE ACTIVITIES.
C. CHECKS EVERY 6 MONTHS, OR MORE FREQUENTLY, FOR: i) SEDIMENT BUILDUP AND THE NEED fOR REMOVAL
~ ~ ~ ~ ~ 7 ` ` 2) EROSION ALONG THE BANK AND THE NEED FOR RESEEDING OR STABILIZA110N AND
~ ~ ~ ~ i ~ IF RESEEDING IS NECESSARY, A RESEEDING SCHEDULE. ~ 3) EROSION AT THE INLET AND OUTLET AND METHODS OF STABILIZATION
~ ~ / ~ ~ 4) SEEPAGE THROUGH THE DAM 5) OPERATION OF ANY VALVES OR MECHANICAL COMPONENTS O
~ ~ 1 ~ ~ ~ ~ / ~ D. AGREEMENT SIGNED AND NOTARIZED BY THE RESPONSIBLE PARTY TO PERFORM THE TASKS SPECIFIED IN 1HE PLAN, INCLUDING INSPECTIONS, OPERATION, AND ANY NEEDED
~ ~ ~ MAINTENANCE ACTIVITIES.
1 w / ~
rn `0 ~ o
~rn ~ ~ ~ ~ 1 1 rn ~ ~ ~ INSPECTIONS =
l ~ / ~ i 1. NORM CAROLINAS STORM WATER RULES REQUIRE ANNUAL INSPECTIONS BY THE REGULATING
AGENCY OF THE WET DE77=NTlON PONDS AS A MINIMUM. MORE FREQUENT INSPECTIONS BY THE LAND OWNER, OR POND OPERATOR ARf STRONGLY ENCOURAGED TO ENSURE THE PROPER O
~ OPERATION OF A WET DE77=NTION POND. LOCAL GOVERNMENTS CAN REQUIRE MORE FREQUENT INSPECTIONS, AND ALL LOCAL CODES SHOULD BE CONSULTED.
II, ~ ~ ~ 2. THE DIVISION OF ENVIRONMENTAL MANAGEMENT AND SEVERAL LOCAL GOVERNMENTS HAVE DEVELOPED INSPECTION SHEETS THAT SERVE AS CHECKLISTS FOR INSPECTORS. AT A MINIMUM
AN INSPECTON SHOULD INCLUDE REVIEW OF THE FOLLOWING.
1 A. OBSTRUCTIONS OF THE INLET AND OUTLET DEVICES BY TRASH AND DEBRIS B. EXCESSIVE EROSION OR SEDIMENTATION IN OR AROUND THE BASIN
t inx uawro nr " C. CRACKING OR SETTLING OF THE DAM D. DETERIORATION OF INLET OR OUTLET PIPES
E. CONDITION OF THE EMERGENCY SPILLWAY F. STABILITY OF SIDE SLOPES
7 G. UP AND DOWNSTREAM CHANNEL CONDITIONS
ancr smucnnr ! H. WOODY VEGETATION IN OR ON THE DAM
~.Mff ~ ~
® I ~ ~ ~
~ 9 1 ~ • ~ sz • ~ ~ ~
0 I~~ 96 ~1G ~ ® 5 ~1G
• ~ ~ • ~1G
~ ~ i !i ~ ~ i• ~ O ~
~ i; ~ • ~ •1•
• • • ® i
970
l O
l
TRASH HOOD/
~ ' 1 ANTI-VORTEX RACK TOP OF DAM
r 10' LITTORAL 874.00
r SHELF PROP. CRADf ~ TOP OF RISER
(1) 1.5" ORIFICE HOLE AT 968.50 ~ FOR DETENTION 10:I
i'" INV AT 967.50 SLOPE
r . ~ PERMANENT STATIC
/ POOL ELEV= 967.50 ' ' AQUATIC PLANTINGS ~i' MIN. FROM ACCEPTABLE DESCRIPTION
r r .~'r (1) 1.5" INLET PIPE SPECIES LISTING FOR
~ r EXTENDED 1' BELOW POND #1 STATE OF NORTH CAROLINA SCHEMATIC PHASE PERMANENT POOL SURFACE ALONG THE OUTER PERIMETER DESIGN DEVELOPMENT
PROP. LITTORAL SHELF AND NOT PROP. STEPS ®NO MORE THAN 36" RC IN THE WEIR SECTION.
15" O.C. RISER O (SEE PLANTING DETAIL BELOW)
I SLUICE SUPPORTS r~" PER MANUF. ~ WEIR CORE TO BE
NOTE:
USE THE FOLLOWING AQUATIC PLANTING IN THE OUTER PERIMETER OF THE POND'S ATIC PLANTING ~ 95% COMPACTED CLAY OF THE POND'S ~ 6x8 CONC. OBTAIN MATERIAL ON SITE
~ LITTORAL SHELF IN AN ALTERNATING PATTE ERNATING PATTERN BOX AS DESIGNATED BY ENGINEER
~ AS SHOWN IN THIS DETAIL. (ALTER PLANTS ~ ~ FROM THE "SELECTION AND PLANTING GUIL (ALTER PLANTS TOP OF )PLANTING GUIDE BOX= 965.60
FOR AQUATIC AND WETLAND PLANTS IN THI PLANTS IN THE
PIEDMONT REGION OF NORTH CAROLINA MI TH CAROLINA MANUAL . 12"0 SLUICE RISER GATE
PICKERELWEED - 1 GAL. SIZE ' ELEV. 963.00 iIZE PROPO E 266' - 30" HOPE 0 TLET AT 1.D0% W.H.
,p R.LS.
LIZARD'S TAIL - 1 GAL. SIZE 6.......... IZE ~ BOTTOM - CBSA ARCHITECTS, INC. 20D5 ELEV= 962.00
SOFT STEM BULRUSH - 1 GAL. SIZE GAL. SIZE ~ LINER - 12" MIN. THICKNESS 7' x 9' x 6" THK. ~ 100% COMPACTED CLAY CONC. FOOTING
,r _ . .,~u~iu1~.. ~ ~ .l
Wh9GHl & ASSUUTAItS GAR--!.- ArcrcuwnrAu - i UAL. NLL L -w UtiIAIN MAItKIAL UN Sllt WITH 10x10x8/8 WWM. AS DESIGNATED BY ENGINEER
1".. GRAPHIC SCALE SIZE 0 TWO CONC. ANTI-SEEP COLLARS 00VAL'77
WRIGHT ENGINEERS & SURVEYORS e'°FESSIO MARSH SEEDBOX - 1 GAL. SIZE eZ a EA 20 o io 20 ao eo ! IN THE UPPER 2/3 OF DAM
• 4190 HIGHWAY 16 SOUTH : • e NEWTON, NC 28658 9 4
ti e TYPICAL PLANT DETAIL OF LITTO OF LITTORAL SHELF SECTION A-A AT DAM POND NOTE: ALL JOINTS MUST BE SEALED NOT TO SCALE
'Alss 828 465-5878 FAX 1 inch = 20 ft. WATER TIGHT.
LA 6~ 1 C/NEF;° [phone] OFFICE 8128108 IN FEET NOT TO SCALE
C9,0