20100290 Ver 1_More Info Received_20100504

' LFg'EcoEngineenng
A division of The John R. McAdams Company, Inc.
LETTER OF TRANSMITTAL
To: Mrs. Annette Lucas/ Mrs. Amv Chaoman
NC Division of Water Quality - 401 Unit
2321 Crabtree Boulevard, Suite 120
Raleigh, North Carolina 27604
919-733-1786
Re: Podger Buffer Variance
REVISIONS
I am sending you the following item(s):
COPIES DATE NO. DESCRIPTION
3 REVISED - Rainwater Harvesting Supplement / calcs
3 Overall Site Plan w. Contours
3 Cistern Inset
3 Profile Water Harvesting System
These are transmitted as checked below:
? As requested
? For approval
® For review and comment
Remarks:
Copy to:
? For your used
? F / AV/ , ?'
1Q
WETLAtrp$ qNp g?rOJ ?YeA*£?! @t?WCH
Signed:
Carolyn Podger for Kevin Yates
Project Manager
FOR INTERNAL USE ONLY
? Copy Letter of Transmittal Only to File
? Copy Entire Document to File
2905 Meridian Parkway, Durham, North Carolina 27713
PO Box 14005, RTP, North Carolina 27709
1 ?- DQA O
Date: May 3, 2010
** HAND DELIVER **
Job No.: SPEC-10030
Permit No.
(to be provided by DWQ)
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
RAINWATER HARVESTING SUPPLEMENT QULS P U rJ ?{ /3 p b
This form must be filled out, printed and submitted.
The Required Items Checklist (Part /Il) must be printed, fiifed out and submitted akig with all of the required information.
L PROJECT INFORMATION
Project name Podger - Buffer Variance Request
Contact person Owner. Carolyn Podger I Consultant: Kevin Yates
Phone number Carolyn Podger: 919467-3644 f EcoEngineering; 919-361-5000
Date 411612010
Drainage area number # 1
III. DESIGN INFORMATION
Site Characteristics
Captured Horizontal Surface Area of Roof 840 fe
Are you in Coastal County SA waters or ORW Areas? No Fill out Non-SA Waters!Other Section
Storage Volume: Non-SA Waters I Other
Design rainfall 1 in OK
Rain Harvesting Volume Provided (Must include a factor of safety at 3 Cistern Volume Must be at least 1.2X Design Rainfall
80'2 ft
least 1.2x design rainfall) Runoff
Rain Harvesting Volume Provided 599.96 gal
Storage Volume: SA Waters & Saltwater ORW Areas
Runoff Volume generated from 1.5" ft3
1-yr, 24-hr rainfall depth at your site in Do not fill out this section
Pre-Development 1-yr, 24-hr Runoff ft3 Do not fill out this section
Post-Development 1-yr, 24-hr Runoff ft3 Do not fill out this section
1-yr, 24-hr Runoff Volume Post-Pre 0.00 ff3 Do not fill out this section
Use 1.5` or Pre/Post? Do not fill out this section
Volume of Rainwater Harvesting System Provided
Rain Harvesting Volume Provided at Site 90 Minimum Rainwater Harvesting Volume must be at least
1.2 times the Runoff Volume
Factor of Safety 1.20 OK
Rain Harvesting Volume Provided 599.98 gal
Form SW401-Rainwater Harvesting-Rev.3 Parts I. & II. Design Summary, Page 1 of 3
Permit No.
(to be provided by DWQ)
% Runoff
% Runoff Used On-Site 100 %
Primary Method Used On-Site watering off-site mulch
% Runoff Treated On-Site %
Primary Method of Treatment
% Runoff Infiltrated On-Site %
Total Runoff Accounted For 100 % OK
Water Balance Calculations Attached?
Cistern Overflow, Gutter, & Gutter Downspout Sizing
Closest City Raleigh
Captured Roof Area 840 fe
Overflow Pipe Diameter Needed (in Dec. Inches) (2) 2" pipes in
Maximum Captured Area for above Overflow Pipe 840 f? OK
Guttering
Please attach a table showing Gutter numbers, slopes,
diameters, downspout sizing and areas going to each
Number of Gutters Total 2 gutters gutter
Do you have a plan details showing numbered gutters? Yes Please include plan details showing numbered gutters
Do you have a detailed table showing slopes of all gutters? Yes gutters
Do you have a detailed table showing diameters of all gutters? Yes gutters
Do you have a detailed table showing downspout diameter of all
Yes Please include a detailed table showing downspout
gutters? diameter of all gutters
Do you have a detailed table showing maximum captured area for
Yes Please include a detailed table showing maximum
all gutters? captured area for all gutters
Additional Design Elements
Have you modeled this system using a water harvesting model? Yes OK
Days to Draw Down Rainwater Harvester 5 days
Overflow discharged to: Vegetated Area OK
Does the overflow discharge directly to impervious surfaces? No OK
What is the overflow velocity for the 10-year storm? 1.49 fvs .?, See ti. 3 &At!)

Yes Please provide calculations to show non-erosive
is the overflow velocity non-erosive velocity
Is a First Flush Diverter Used? No
If First Flush Diverter used, where is bypassed water discharged to? None of the above OK
Actual City Cary
Closest City Raleigh
Average Annual Historic Rainfall at your Site 46.49 in
Percent of Rainfall that will Overflow Cistern - 1 %
Additional Design Elements
Which Model? FreeFlo
Does this cistern have a dedicated year-round use? Yes OK
Screen Sizing at Entrance to Rainwater Harvester 1 mm OK
Do you have a secondary water supply to the rainwater harvester? No
Plans for the footing included in submittal? Yes OK
Is the cistern buried? No OK
Pump provided? What is the pressure? psi
What are the designated uses of the pump? watering off-site mulch
Are Pump Sizing Calculations Attached? Yes
Is Cistern Metal? No OK
If Metal Cistern - Is Waterproof Bladder Provided?
If the only use is irrigation - are plans provided? N/A OK
Labeled as non-potable water? Yes OK
Form SW401-Rainwater Harvesting-Rev.3 Parts I. & il. Design Summary, Page 2 of 3
Puimit No. __ _ __
(to!r provid dGy,)VVQ)
Arc I ocal & SIa(e pumbing codes followed? Yes
Dons this root area deduct fit )A from calculations of another HMP? No
If so, what HPAII?
(doles:
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Porn SW401-Rainwater Harvesting-Rev3 Pads I. & II. Design Summary, Page 3 of 3

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