NC0083909_Staff Report_19931223

i��P&j
SOC PRIORITY PROJECT
If Yes, SOC No.
To: Permits and Engineering Unit
Water Quality Section
Attention: Randy Kepler
Date December 23, 1993
Yes No
NPDES STAFF REPORT AND RECOMMENDATION
County Dare
Permit No. NCO083909
U3-o� —SS
PART I - GENERAL INFORMATION
1. Facility and Address:
2. Date of Investigation
3. Report Prepared by:
Mr. Terry Wheeler
County of Dare
600 Mustian Street
Kill Devil Hills, NC 27948
December 14, 1993
Scott Jones
-e)L- . KkN-a- QT
4. Persons Contacted and Telephone Number:
Mr. Bob Crutchfield (ORC Dare Co. RO WTP) - [phone]
5. Directions to the Site: This project is located just off NC Highway 12 in Rodanthe
in Dare County.
6. Discharge Point(s), List for all discharge points:
Latitude: 75°28'12"N Longitude: 35035'43"W
Attach a USGS map extract and indicate treatment facility site and discharge point on map.
U.S.G.S. Quad No. U.S.G.S. Quad Name Rodanthe
7. Site size and expansion area consistent with application?
X Yes — No If No, explain:

8. Topography (relationship to flood plain included): Site is flat and approximately 3-8 feet
above mean sea level.
9. Location of nearest dwelling: The nearest dwelling is approximately 250 feet from
facility.
10. Receiving stream or affected surface waters: Blackmar Gut to Pamlico Sound.
a. Classification: Class SA
b. River Basin and Subbasin No.: Pasquotank, 03-01-55
C. Describe receiving stream features and pertinent
downstream uses: The receiving stream has been partially altered to act
as a small harbor for several commercial vessels which offload fish
catches, onload fuel and supplies, and perform routine boat repair and
maintenance. Additionally, there is a small boat launching ramp.
PART H - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater to be permitted: > 0.05 MGD
b. What is the current permitted capacity of the Waste Water Treatment facility?
New Facility. The Dare County Reverse Osmosis WTP at Kill Devil Hills has
no flow limitation in its permit (NC0074047).
C. Actual treatment capacity of the current facility (current design capacity)?
NA
d. Date(s) and construction activities allowed by previous Authorizations to
Construct issued in the previous two years: NA
e. Please provide a description of existing or substantially constructed wastewater
treatment facilities: None
f. Please provide a description of proposed wastewater treatment facilities:
This facility to be modeled after the Reverse Osmosis WTP at Kill Devil Hills
currently on line and operated by Dare County. Discharge will consist of
brackish/brine water from a reverse osmosis water treatment plant.
g. Possible toxic impacts to surface waters: None known.
h. Pretreatment Program (POTWs only):
in development_ approved_
should be require_ not needed X
2. Residuals handling and utilization/disposal scheme: Not applicable

a. If residuals are being land applied, please specify DEM permit no.
• Residuals Contractor
Telephone No.
b. Residuals stabilization: NA PSRP PFRP Other
C. Landfill: NA
d. Other disposal/utilization scheme (Specify): NA
3. Treatment plant classification (attach completed rating sheet):
Class 0, less than 5 points.
4. SIC Code(s): 4941
Wastewater Code(s)
Primary 22 Secondary _
Main Treatment Unit Code:
PART III ' - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public
monies involved. (municipals only)? NA
2. Special monitoring or limitations (including toxicity) requests: NA
3. Important SOC, JOC or Compliance Schedule dates: (Please indicate) NA
Da
Submission of Plans and Specifications
Begin Construction
Complete Construction
4. Alternative Analysis Evaluation: Has the facility evaluated all of the non -discharge
options available. Please provide regional perspective for each option evaluated.
Spray Irrigation: Not feasible based on volume and operational constraints.
NPDES Permit Staff Report
Version 10/92
Page 3

Connection to Regional Sewer System: Regional sewer is unavailable.
Subsurface: Not practical based on volume of wastewater.
Other disposal options: NA
5. Other Special Items: Due to nature of discharge the following parameters should be
included in said permit: Total Suspended Solids, Settleable Solids, Turbidity, Metals,
pH.
PART IV - EVALUATION AND RECOMMENDATIONS
The above referenced application is for the discharge of brine/brackish backwash
from filters at a new reverse osmosis plant to be built to serve the communities of
Waves, Salvo, and Rodanthe. A timetable for construction is unknown at this time.
The actual plant consisting of"groundwater collection system, pH adjustment, pressure
filters, high pressure pumps, reverse osmosis filters, disinfection, and storage tanks
will be located on the east side of NC Highway 12 in Rodanthe. All brine discharge
will be piped under the road to Blackmar Gut. Based on discussion with Mr.
Crutchfield, it is unknown if this discharge will be gravity flow or pumped flow.
It is recommended that NPDES Permit NCO083909 be issued to this facility. This
issuance should coincide with the basin -wide permit cycle for the Pasquotank River
Basin.
Date
NPDES Permit Staff Report
Version 10/92
MKT
Page 4

RODANTH E QUADRANGLE
NORTH CAROL I NA —DARE CO
7.5 MINUTE SERIES (TOPOGRAPHIC)
NAGS EAD 25 MI. o '
;56 29' 3 050 000 FEET 459 75 635°37'30'
•ti "42
Round HammocR1: 700000
Bay "- . % FEET
}�-:'
D L I F E R E F_
T "41
= —a
Dare County Reverse Osmos WTP -
Paula D a:= Rodanthe Unit
:1..=_
NPDES Permit No. NCO0839 9
• • .= a-.- Plant Site
,µ.:. Discharge Point
3940
• — 02., 6
14
•~'A .•. �i.• N
Uncle
Lan&n - -
Greens Pt
Blackmar Gui� ~'r '�� �- �'; i939
Rodanthe-
1
j r p 3938
—35'
:: yI
North Drain I
Aunt Phoebes i 3937
Marsh
tci. o ti.