WQ0040626_More Information (Requested)_20190523

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
ANDREW MILLER
5603 MISTY HILL CIRCLE
CLEMMONS, NORTH CAROLINA 27012
Dear Mr. Miller:
NORTH CAROLINA
Environmental Quality
May 23, 2019
Subject: Application No. WQ0040626
Additional Information Request
1725 Stonefeld Ln. SFR
Single -Family Residence
Wastewater Irrigation System
Forsyth County
Division of Water Resources' Central and Regional staff has reviewed the application package
received February 6, 2019 and additional information received April 23, 2019. However, additional
information is required before the review may be completed. Please address the items on the attached pages
no later than the close of business on June 24, 2019.
Please be aware that you are responsible for meeting all requirements set forth in North Carolina
rules and regulations. Any oversights that occurred in the review of the subject application package are
still the Applicant's responsibility. In addition, any omissions made in responding to the outstanding items
in Sections A through D, or failure to provide the additional information on or before the above requested
date may result in your application being returned as incomplete.
Please reference the subject application number when providing the requested information. All
revised and/or additional documentation shall be signed, sealed and dated (where needed), with two paper
copies and one electronic copy submitted to my attention at the address below.
If you have any questions regarding this request, please do not hesitate to contact me at (919) 707-
3659 or [e-mail]. Thank you for your cooperation.
Sin�erely
Erick .5aunders, Engineer
Division of Water Resources
cc: Winston-Salem Regional Office, Water Quality Regional Operations Section (Electronic Copy)
John R. Harmon, PE (Electronic Copy)
Permit Application File WQ0040626
;� North Carolina Department of Environmental Quality I Division of Water Resources
NOAnicxu Lklll�
512 North Salisbury .Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617

Mr. Andrew Miller
May 23, 2019
Page 2 of 3
A. Soil Evaluation:
1. The Licensed Soil Scientist indicated in his letter that the Bt soil horizon was the only horizon
measured because it was the least restrictive horizon. In accordance with 15A NCAC 02T
.0604(b)(2), hydraulic loading rates shall be based on in -situ measurements of saturated hydraulic
conductivity in the most restrictive horizon. Provide a clarification on whether the Bt soil horizon
was the most or least restrictive.
2. Upon a second site inspection, a drainage feature was found within the 25 foot setback of the
proposed spray field. A field delineated detailed soils map shall be submitted, identifying an
updated suitable irrigation area with this feature included. This map should be signed, sealed and
stamped by a North Carolina Licensed Soil Scientist.
B. Eneineerine Plans:
1. See A.2. The spray field plans need to be updated with the changes in suitable irrigation area. The
current spray heads affected by this change are spray heads #3 and #4. Once the spray field's
configuration is redesigned, the area must be calculated to verify that it meets the minimum of
14,950 square feet needed from the SFR Loading Rate Workbook (SFRLRW). See comment D.1.
2. The Overall Site Map on Page 2 of 6 of the construction plans indicates that spray heads #3, #4, #6
and #7 have partial spray radii with wetted diameters that don't extend radially outward from the
spray head. The wetted diameter must always extend in a straight line outwards from the spray
head. Please adjust the drawings that show the corrected wetted zones and make any adjustments
to the field area in the application and engineering calculations.
3. During the site inspection, it was noted that the driveway that was shown on the Overall Site Map
page of the plans is incorrect. It appeared that the driveway followed the old road bed that runs
adjacent to the field. As the irrigation area must be restricted from public access by a minimum of
a two strand fence, the site map must be revised to show the new driveway location in respect to
the fencing.
C. Engineering Calculations:
Per 15A NCAC 02T .0604(c)(3), provide hydraulic and pollutant loading calculations for each
treatment unit demonstrating how the designed effluent concentrations in Application Item V.I.
were determined (Note: "black box" calculations are unacceptable).
D. Recommendations (Response not required):
1. The attached sketch details the changes that the regional inspector suggests based on conversations
with Chris Murray, the soil scientist consultant.
2. It was noted that the permittee had begun to grade the driveway into the proposed home site
following the old road bed mentioned in comment A.3. Please note that any cut of two feet or more
in vertical height that may arise from this grading has an associated 15 foot setback to the irrigation
area as per 15A NCAC 02T .0606. Because the old road bed was seen to be adjacent to the irrigation
area, it is worth mentioning that some areas currently proposed for irrigation will become unsuitable

Mr. Andrew Miller
May 23, 2019
Page 3 of 3
due to the 15 foot setback if additional grading occurs close to the irrigation area with cuts of greater
than two feet.
3. The regional inspector noticed that the spray heads are currently proposed at 18 inch above grade.
Due to the slope present in the spray field, it is recommended spray heads be installed to 24-36
inches.
4. The water balance of the system from the SFRLRW suggests that the minimum of 5 days of
effective storage would be insufficient. It is recommended the storage of the system be increased
to a minimum of 10 days of effective storage.

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