WQ0044892_More Information (Requested)_20240124

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
JUSTO JULIO ESCOBAR GODINEZ
15 ELAIN CIRCLE
DURHAm, NORTH CAROLINA 27703
Dear Mr. Escobar,
NORTH CAROLINA
Environmental Quality
January 24, 2024
Subject: Application No. WQ0044892
Additional Information Request 91
2501 Hollyheight Dr. SFR
Single -Family Residence
Wastewater Irrigation System
Durham County
Division of Water Resources' Central and Regional staff has reviewed the application package
received on November 2, 2023. However, the Division requires additional information before completing
our review. Please address the items on the attached pages no later than the close of business on February
23, 2024.
Please be aware that the Applicant is responsible for meeting all requirements set forth in North
Carolina rules and regulations. The Applicant is also responsible for any oversights that occur during the
review of the subject application package. The Division may return the application as incomplete pursuant
to 15A NCAC 02T .0107(e)(2) if any omissions are made when responding to the outstanding items in
Sections A through B or the Applicant fails to provide the additional information on or before the above -
requested date.
Please reference the subject application number when providing the requested information. The
Applicant shall sign, seal, and date (where applicable) all revised and/or additional documentation and
submit an electronic response to my attention via the Non -Discharge online portal.
If you have any questions regarding this request, please contact me at [phone] or
cord.anthony&deq.nc.gov. Thank you for your cooperation.
DocuSigned by:
Sincerely, ,i A�
2D03237162FA4E5...
Cord Anthony, Engineer II
Division of Water Resources
cc: Raleigh Regional Office, Water Quality Regional Operations Section (Electronic Copy)
Kevin D. Davidson, PE — Agri -Waste Technology, Inc. (Electronic Copy)
Laserfiche File (Electronic Copy)
D � North Carolina Department of Environmental Quality i Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
NORTH CAROLINA
�0w0_0 W �i­0­; /I 919,707.9000

Mr. Justo Julio Escobar Godinez
January 24, 2024
Page 2 of 2
A. Soil Evaluation:
1. Chris Smith of the Raleigh Regional Office noted the following:
a. The evaluation narrative states "The area evaluated and suitable for the proposed system is
about 46,000 ft2, so ample space is available for the wastewater irrigation system anywhere
within the evaluated area." The disposal area calculation is using a Drainage Coefficient (DC)
of 13%. According to the DWR Soil Scientist Evaluation Policy and the EPA Process Design
Manual: Land Treatment of Municipal Wastewater Effluents (EPA 625/R-06/016) a DC of 4-
10% is recommended. The inconsistency of the Ksat values (0.01, 0.02, and 0.09 in/hr) and the
stated shallow depth to the high water table do not support an elevated DC. DWR staff
recommends that the DC be reduced to a maximum of 10% and the disposal area size be
increased.
b. The report states the water table on the site is perched. Low chroma colors are described at
depths of 5", 6", and I Y' for Ksat measurement locations 1, 2, and 3 respectively. The low
chroma values continue to be described throughout the soil profile after the initial observance
depth at every Ksat nest location. The continued observance of these low chroma values
throughout the evaluation range potentially indicates an extended period of saturation through
the lower parts of the soil profile and does not support the statement that the water table
encountered is perched.
c. The application does not include a clear and detailed soils map. A site drawing is included, but
lines delineating various features are not continuous due to the inclusion of text labels. An
aerial image map clearly delineating soil series polygons, Ksat nest locations, and soil boring
locations should be provided to assist DWR staff in locating these features in the field.
d. The site drawing provided appears to show both Creedmoor and White Store soil series with
differing slopes present in the proposed disposal area, but only Creedmoor is mentioned in the
evaluation. Ksat data and soil profile descriptions are provided only for the Creedmoor series.
No explanation has been offered for the exclusion of the White Store series from the soils
evaluation. Please explain.
Please respond to the above concerns and give further insight into the decision making process for
this site. Additionally, the plot included for Ksat 1 shows a linear increase across the final three
measured values. This does not indicate that steady state within this test was achieved. Please
explain how steady state was determined within this specific test.
B. Engineering Calculations:
1. According to the engineering calculations, 0.48 acres of irrigation area has been designed for the
system. Form: SFRWWIS 06-16 notes that the irrigation area is 0.53 acres (including blanking).
Of the 0.53 total acres, how much area is being wetted and contributing to the irrigation capacity
of the facility?