Wastewater Treatment and Dispersal System - Stilley Station.pdf
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- Solicitation number
- 475-SW-FY26-004
- Issued by
- Beaufort County, North Carolina
About this file
This is an onsite wastewater system evaluation report prepared for Beaufort County, North Carolina, detailing the design and specifications for a wastewater treatment and dispersal system at the Stilley Station Convenience Site located at 362 Stilley Station Road. The facility is designed to serve an office with seven employees generating domestic strength wastewater at a design flow of 100 gallons per day and an initial and repair loading rate of 0.1 gallons per day per square foot. The system utilizes a 1,000-gallon traffic-rated septic tank with three trenches of 56 feet each, 13 horizontal panels per line, and a T&J Panel Mound System for both initial installation and repair. The mound system includes a total fill area of 3,833 square feet with 18 inches of fill plus 6-inch trench depth, totaling 24 inches of fill height above grade. A 475-foot supply line with 3-inch Schedule 40 diameter serves the system, with the initial 100 feet buried 30 inches or sleeved in ductile iron pipe for traffic protection. The report was prepared by Gary Kreiser, a North Carolina Licensed Soil Scientist and Onsite Wastewater Evaluator, and submitted January 28, 2026, in compliance with G.S. 130A-336.2 requirements.
The report includes detailed site plans at two scales (150-foot and 60-foot) showing the layout of the septic tank, initial and repair mound systems, supply lines, and clearances from existing infrastructure including water lines and roadway edges. Critical design notes specify that the drainfield must not be cut, filled, or altered and that all setback requirements must be followed. The system design accommodates potential future repairs with specifications for the same mound system configuration, with the notation that a pump may be required for repair operations. Distribution is managed through a D-Box system, with cleanouts specified at maximum 100-foot intervals or at junctions exceeding 45 degrees. The facility is located in proximity to Blounts Creek and requires adherence to all applicable Beaufort County regulations and North Carolina onsite wastewater standards.
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Text version
115 MacKenan Drive | Cary, NC 27511 t: 919.469.3340 | f: 919.467.6008 | www.withersravenel.com | License No. F-1479
Asheville | Cary | Charlotte | Greensboro | Pittsboro | Powells Point | Raleigh | Southern Pines | Wilmington
Wastewater Treatment and Dispersal System
Stilley Station Convenience Site 362 Stilley Station Road
Beaufort County
PIN: 6519-60-8727
Beaufort County Owner: Beaufort County
January 28, 2026
The report is being submitted pursuant to and meets the requirements of G.S. 130A-336.2 for the purpose of the installation of a wastewater system.
Prepared by:
Gary Kreiser NC Licensed Soil Scientist #1276
NC Onsite Wastewater Evaluator #10051E
115 MacKenan Drive | Cary, NC 27511 t: 919.469.3340 | f: 919.467.6008 | www.withersravenel.com | License No. F-1479
Asheville | Cary | Charlotte | Greensboro | Pittsboro | Powells Point | Raleigh | Southern Pines | Wilmington
AOWE SITE/SYSTEM SUMMARY SPECIFICATIONS
Owner: Beaufort County County: Beaufort 362 Stilley Station Road
PIN: 6519-60-8727
Facility Type: Office- domestic strength wastewater Design Flow – 14 gal/employee- 100 gpd Total number of employees - 7 Initial and Repair LTAR: 0.1 gpd/ft2
System Notes Initial T&J Panel Mound System
Repair: T&J Panel Mound System Same Design as Initial. Pump may be required for repair
Number of Trenches 3 Length of Each Trench 56 ft
Number of Panels (per line) 13 Panels-Horizontal Trench height 6 inches above grade Height of Fill 18 inches Total Height of Fill (including cover)
24 inches
Width of Bottom 47 feet Length of Bottom 82 feet Total Fill Area 3833 ft2
Septic Tank Size 1,000 gallons Traffic Protection Traffic Rated Tank &
Bollards or other means to protect from nearby traffic
Supply Line Length 475 ft Supply Line Diameter 3 inch SCH 40 Traffic Protection –
100’ buried 30 inches or sleeved in DIP
Cleanouts Max 100’ or junctions greater than 45 degrees
Distribution D-Box
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OFFICE
SEPTIC TANK (TRAFFIC RATED)
PROTECT FROM TRAFFIC
10' FROM WATER LINE
WATER LINE
SUPPLY LINE - 475'
SUPPLY LINE - 70'
PROTECT FROM TRAFFIC
INITIAL MOUND SYSTEM
REPAIR MOUND SYSTEM
STILLEY STATION
SEPTIC LAYOUT -150' SCALE
BLOUNTS CREEK BEAUFORT COUNTY NORTH CAROLINA
1 inch = 150 ft.
GRAPHIC SCALE
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1) DO NOT CUT, FILL OR ALTER DRAINFIELD.
2) FOLLOW ALL SETBACK REQUIREMENTS
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47' x 82'
31'
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OFFICE
SUPPLY LINE - 70'
PROTECT FROM TRAFFIC
SUPPLY LINE - 475'
INITIAL MOUND SYSTEM
REPAIR MOUND SYSTEM
SEPTIC TANK (TRAFFIC RATED)
PROTECT FROM TRAFFIC
10' FROM WATER LINE
EDGE OF PAVEMENT
EDGE OF ROW
STILLEY STATION
SEPTIC LAYOUT -60' SCALE
BLOUNTS CREEK BEAUFORT COUNTY NORTH CAROLINA
1 inch = 60 ft.
GRAPHIC SCALE
0 30 60
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CONVENIENCE SITE
NOTES:
1) DO NOT CUT, FILL OR ALTER DRAINFIELD.
2) FOLLOW ALL SETBACK REQUIREMENTS
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