20071888 Ver 1_More Info Received_20080617

HAL OWEN & ASSOCIATES, INC.
SOIL & ENVIRONMENTAL SCIENTISTS
P.O. Box 400, 266 Old Coats Road
Lillington, NC 27546-0400
Phone [phone] / Fax [phone]
E-mail: [e-mail]
16 June 2008
Ms. Cyndi Karoly
DWQ 401/WetlandsUnit
1650 Mail Service Center
Raleigh, NC 27699-1650
Reference: Request for Additional Information
Blake Commons Subdivision (proposed)
Cumberland County, North Carolina
USACE Action ID 2006-32609; DWQ Project # 07-1888
Dear Ms. Karoly,
We received a copy of the DWQ request for additional information dated 19 May 2008.
The following items are provided as requested.
1. Submit plans at a scale of no smaller than I "=50' with topographic contours
Survey maps at a scale of 1 inch = 50 feet depicting the development plan, proposed
house footprints and driveways, topographic contours, delineation of drainage areas
used for impervious area calculation, drainage easements, and wetlands are enclosed.
2. Provide detailed documentation of the imperviousness
A calculation of impervious area has been prepared by Allen-Allen & Associates of
NC, PA (attached). The property can be divided into 2 drainage areas. Drainage
Area #1 in the southwest portion of the property has an impervious area of 23.92 %.
The lots in this drainage area will be limited to 1575 sqft of impervious area.
Drainage Area #2 in the northeast portion of the property has an impervious area of
23.72%. The lots in this drainage area will be limited to 1800 sgft per lot. Mr. Joe
Gillis of Gillis Development (owner) has provided a signed letter certifying that the
impervious are per lot will be limited as described above and recorded as part of the
Deeds of Record for each lot (attached).
3. If a SMP is required for any of the drainage areas, please provide properly designed
BMPS.
The maximum impervious area for each drainage basin is less than 24%, therefore a
SMP is not required.
Q?c??aW9= D
JUN 1 7 2008
DENR - WATER QUALITY
WETLANDS AND STORMWATER BRANCH
Soil Science Investigations • Wetland Delineations, Permitting, and Consulting
HAL OWEN & ASSOCIATES, INC.
I trust that this provides the information you require to complete the review of the pre-
construction notification. If you have any questions or need additional information, please feel free to
contact me at your convenience.
Sincerely,
Krissina B. Newcomb
Project Environmental Scientist I
CC: Harvey Allen, Allen-Allen & Associates of NC
Joe Gillis, Gillis Development
Soil Science Investigations • Wetland Delineations, Permitting, and Consulting
ALLEN-ALLEN & ASSOCIATES of N.C., P.A.
Engineers, Land Planners & Surveyors
2606 Raeford Road, Suite 31 [phone] (Phone)
Fayetteville, N.C. 28303 [phone] (Fax)
Blake Commons - Allowable Impervious Area per Lot
Area #1, Lots 16 - 56 (41 Lots)
Total Area = 13.24 ac
Impervious Road Area = 1.68 ac
Total Wetlands Area = 2.15 ac
100' Wide Strip of Wetlands Area = 2.13 ac
Wetland Adjusted Area:
Method 1:
2.15/13.24 = 16.24% < 25%, therefore use 13.24 ac
Method 2:
13.24-2.15=11.09 ac
11.09 + 2.13 = 13.22 ac
Therefore Use 13.22 ac in calculations
Allowable Impervious Area for Each Lot
13.22 * 0.24 = 3.17 ac
3.17-1.68=1.49 ac
(1.49 ac * 43560 sf/ac)/41 = 1583
Use 1575 sf per lot
((1575 * 41/43560) + 1.68)/13.22 = 23.92%

Page I

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Blake Commons - Allowable Impervious Area per Lot
Area #2, Lots 1-15 & 57 - 60 (19 Lots)
Total Area =11.94 ac
Impervious Road Area = 0.65 ac
Total Wetlands Area = 7.40 ac
100' Wide Strip of Wetlands Area = 6.53 ac
Wetland Adjusted Area:
Method 1:
7.40/11.94 = 61.98% > 25%,
11.94-7.4=4.54
4.54/0.75 = 6.05, therefore use 6.05 ac
Method 2:
11.94 - 7.40 = ac
4.54 + 6.53 = 11.07 ac
Therefore Use 6.05 ac in calculations
Allowable Impervious Area for Each Lot
6.05 * 0.24 = 1.45 ac
1.45-0.65=0.80 ac
(0.80 ac * 43560 sf/ac)19 = 1834
Use 1800 sf per lot
((1800 * 41/43560) + 0.65)/6.05 = 23.72%
Page 2
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Gillis Development
Residential Construction and Land Development
8623 Galatia Church Road
Fayetteville, NC 28304
Phone: [phone]
June 11, 2008
To Whom It May Concern:
Re: Blake Commons - Allowable Impervious Area per Lot
By means of this letter, I, Joe H. Gillis, owner of Blake Commons, certify that the
allowable areas per Lot, as stated below, will be adhered to, and will be part of the Deeds
of Record for each Lot.
These areas will include any impervious area, to include drives, sidewalks, sheds, the
house footprint, patios, pools and any other surface that would be impervious. Should a
pervious material for the drives, sidewalks, patios, etc. be contemplated, this will be
proposed to the DWQ and approved, prior to use.
Area I Impervious Area per Lot =1586 Square feet
Area 2 Impervious area per Lot =1800 Square feet
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