SW6110806_COMPLIANCE_20111028

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW ��Dr�DiQ
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD
I

Patterson, Robert
From: Patterson, Robert
Sent: Friday, October 28, 2011 6:51 AM
To: 'Tom Goodwin'
Subject: SW6110806 - Wedgefield Apartments - Add. Info. Req'st
Tom,
I received the add. info on 10/27/11. 1 noted that you said you are waiting for the owner to sign the O&Ms.
With the change in BMPs and DAs, SWU-101 also needs to be revised and submitted. Please submit this with the
original 0&Ms.
Thanks.
Robert D. Patterson, PE
Environmental Engineer
NCDRNR I DWQ I Stormwater Permitting
1617 Mail Service Center, Raleigh, NC 27699-1617 Mail 1 512 N. Salisbury St, Raleigh, NC 27604 1 9ch Floor Location & Parcels
[phone] Phone [phone] Fa I Robert. Pattersonancdenr.eov EtnniI I http://portal. nedenr.org/web/wa/ws/su Website
rA Berne printing this email, please consider your budget and the environment.
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties unless the content is
exempt by statute c r other regulation.

J
October 17, 2011
NCDENR — DWQ
Stormwater Permitting Unit
512 N. Salisbury St.
Raleigh, NC 27699-1617
Attn: Robert D. Patterson, PE
Re: Wedgefield Apartments
HUA Job #HC1108
Dear Mr. Patterson,
90 Hobbs Upchurch Associates
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OCT 2 7 2011WATR
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In reference to your emailed comments from August 30, 2011, the following are the responses
to those comments made by your office for the above named project and our responses are as
follows:
1. Please provide the original signed O&M Agreements; only copies were provided.
Waiting for the signed forms from the owner, will provide when received..
2. Any wetlands and surface waters must be shown; or provided a note on the plans
that non exist, if that is the case. Note included on Sheet C-4.
3. Is the pipe from 0#8 labeled correctly as being 58"? Size has been corrected.
4. Please provide the HGL information for the 48" pipe that the 3 bioretention cells
(cells) will be discharging to. Please demonstrate that there will not be backwater
issues for the cells. Invert of 4" PVC underdrain is above the top of the existing
42" pipe which was sized for the 100 yr storm.
5. For all 3 cells, the required 2' separation from the SHWT has not been provided as
required. The separation is measured from the bottom of the stone/underdrain
elevation down to the SHWT elevations provided in the soils report. Two of the
bioretention cells have been eliminated. The remaining cell has 1.84' of
clearance from the bottom of the gravel layer and the SHWT. There has been a
wetlands area incorporated into the design better utilizing the elevation of the
SHWT.
6. Please verify and revise as needed the elevations for cell #3 and associated riser.
The elevations are not consistent between the supplement form and sheets C-3 and
D-10. Revised and corrected.
7. On sheet D-10:
a. The schedule shows grassed cells, but also shows 4" of mulch. There should
not be a mulch layer in grassed cells. Removed the detail to show grass
and no mulch.
Grass cells must be sodded. Please specify that sod be used in the detail,
along with the species of grass. Added note to specify sod.
T: 910.692.5616 I F: 910.6921342 1 300 SW BROAD STREET I SOUTHERN PINES, NC 28388 I WWW.HOBBSUPCHURCH.COM
SUPERIOR PERFORMANCE THROUGH INNOVATIVE DESIGN

Page 2 of 2
c. The bottom of cell values in the schedule do not account for the stone and
underdrain layer depth. Please revise. Made appropriate revisions to the
schedule.
d. Please provide details for the riser structures. Added a yard inlet detail to
be used as the riser.
e. The cell detail needs to be more site specific than the generic detail from the
BMP Manual. It should state the site and cell specific depths of the different
layers, ponding depth, whether filter fabric or choke stone will be used,
underdrain specifics, etc. Changed to a site specific detail.
If you should have any questions or concerns during your review, please do not hesitate to
contact this office.
Sincerely,
HOBBS, UPCHURCH & ASSOCIATES, P.A.
'e ;4'
Thomas K. Goodwin, P.E.
Division Manager
Transportation and Site Development Division

Patterson, Robert
From:
Patterson, Robert'
Sent:
Tuesday, October04, 2011 8:53 AM
To:
'Tom Goodwin'
Cc:
Frank Wanko
Subject:
RE: Wedgefield Apartment Storm Water Plan
Tom,
That sounds fine. Please submit the requested additional information no later than October 24, 2011.
Thanks.
Robert D. Patterson, PE
Environmental Engineer
NCDF,NR I DWQ I Stormwater Permitting
1617 Mail Service Center, Raleigh, NC 27699-1617 Mail 1 512 N. Salisbury St, Raleigh, NC 27604 1 9t" Floor Location &. ParCCIS
[phone] Phone [phone] Fax I Roberr.Patterso oncdenegov Email I http://portal.ncdenr.org/web/wa/ws/su Website
.A Before printing this email, please consider your budget and the environment.
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties unless the content is
exempt by statute or other regulation.
From: Tom Goodwin f mailto:TGoodwin(@hobbsupchurch.coml
Sent: Tuesday, October 04, 2011 8:50 AM
To: Patterson, Robert
Cc: Frank Wanko
Subject: Wedgefield Apartment Storm Water Plan
Mr. Patterson — As you are aware, Hobbs Upchurch has been investigating alternative designs for the storm water ponds
submitted for review due to the high Seasonal High Water table. As such, we are requesting an additional three weeks
extension for the period set for us to resubmit the plan to DWQ. If you have any questions, concerns, or comments,
please let me know.
Tom Goodwin, P.E.
Division Manager, Transportation & Site Development Division
Hobbs Upchurch & Associates
300 SW Broad Street / PO Box 1737 / Southern Pines, NC 28388
Phone [phone] / Fax [phone] / Cell [phone]

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