WQ0000185_Final Permit_19990121

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
January 21, 1999
Mr. William S. Richardson
County Manager, County of Currituck
P.O. Box 39
Currituck, NC 27929
17
4 0 •
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: Permit No. WQ0000185
Ocean Sands, County of Currituck
Rotary Distributor Facilities
Currituck County
Dear Mr. Richardson:
In accordance with your application received December 15, 1997, we are forwarding herewith Permit
No. WQ0000815, dated January 21, 1999, to the County of Currituck for the continued operation of the
subject wastewater rotary distributor facilities.
This permit shall be effective from the date of issuance until December 31, 2004, shall void Permit
No. WQ0000185 issued September 17, 1993, and shall be subject to the conditions and limitations as specified
therein. The permit has been modified to remove the Total Suspended Solids (TSS) sampling from the
groundwater sampling requirements, to add a fecal coliform effluent limit, and to add surface water monitoring
at three designated locations for nitrate -nitrogen, ammonia -nitrogen, and fecal coliform.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right
to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit.
This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina
General Statutes, and filed with the Office of Administrative Hearings,P. . Drawer 27447, Raleigh, NC
27611-7447. Unless such demands are made this permit shall be final a finding. If you need additional
information concerning this matter, please contact Joe Pearce at (919) 73 Mextensio4 .Sincer
Preston Howard, Jr., P.E.
cc: Currituck County Health Department
William P. McDowell, PE
Washington Regional Office, Water Quality Section
Washington Regional Office, Groundwater Section
Bob Cheek, Groundwater Section, Central Office
Technical Assistance and Certification Unit
Non -Discharge Compliance/Enforcement Unit
PO Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] Fax [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post -consumer paper

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
RALEIGH
HIGH RATE INFILTRATION SYSTEM PERMIT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as
amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
County of Currituck
Currituck County
FOR THE
continued operation of a 500,000 GPD tertiary wastewater treatment plant and a 480,000 GPD rotary disposal
area consisting of:
• 130,000 gallon influent aerated surge tank capacity with odor control [three (3) 35,000 gallons tanks and
one (1) 25,000 gallon tank],
• 500,000 GPD capacity aerobic zone, [sixteen (16) 50,000 gallon aeration tanks and eight (8) 25,000 gallon
aeration tanks],
• 500,000 GPD capacity clarifier set, [eight (8) 8335 gallon clarifiers and four (4) 4168 gallon clarifiers],
• 50,000 gallon residuals storage capacity, [ten (10) 5,000 gallon residuals holding tanks],
• 280 sq. ft. of tertiary filtration capacity, [four (4) 42 sq. ft. filters and two (2) 56 sq. ft. filters],
• 10,417 gallon chlorination facilities, [two (2) 3125 gallon contact tanks and one (1) 4167 gallon contact
tank],
• A 3200 gallon dosing tank,
• 480,000 GPD capacity disposal field, [eight (8) 100 foot diameter rotor fields],
• Conditionally approved 600,000 GPD capacity disposal field, [two (2) additional 100 foot diameter rotor
fields for a total of ten (10) 100 foot diameter rotor fields] upon the approval and installation of additional
wastewater treatment capacity. No construction of the additional two (2) rotary distributors shall
commence until plans and specifications for the necessary treatment facilities have been submitted and
approved by the Division to serve the Ocean Sands Development,
• 200 kW of standby power, [two (2) 100 kW generators],
with no discharge of wastes to the surface waters, pursuant to the application received December 15, 1997, and
in conformity with the project plan, specifications, and other supporting data subsequently filed and approved
by the Department of Environment and Natural Resources and considered a part of this permit.
This permit shall be effective from the date of issuance until December 31, 2004, shall void Permit
No. WQ0000185 issued September 17, 1993, and shall be subject to the following specified conditions and
limitations:

I. PERFORMANCE STANDARDS
In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective actions, including those actions that may
be required by the Division of Water Quality (Division), such as the construction of additional or
replacement wastewater treatment or disposal facilities.
2. This permit shall become voidable if the soils fail to adequately assimilate the wastes and may be
rescinded unless the facilities are installed, maintained, and operated in a manner which will
protect the assigned water quality standards of the surface waters and ground waters. The ponding
of wastewater on the surface of the distribution field when the dosing cycle commences shall be
considered as evidence of failure of the soils to adequately assimilate the wastewater.
Additionally, such failure shall be interpreted as a violation of this permit condition.
The residuals generated from these treatment facilities must be disposed in accordance with
General Statute 143-215.1 and in a manner approved by the Division.
4. Adequate measures shall be taken to divert stormwater from the high rate infiltration area and to
prevent wastewater runoff.
Diversion or bypassing of the untreated wastewater from the treatment facilities is prohibited.
6. The issuance of this permit shall not relieve the Permittee of the responsibility for damages to
surface or groundwaters resulting from the operation of this facility.
7. The following buffers shall be maintained:
a) 400 feet between high rate infiltration unit and any habitable residence or place of public
assembly under separate ownership or which is to be sold,
b) 200 feet between high rate infiltration unit and any private or public water supply source and
any streams classified as WS or B,
c) 200 feet from mean high water between high rate infiltration unit and any "SA" or "SB"
classified surface waters,
d) 200 feet from normal high water between high rate infiltration unit and any other stream,
canal, marsh, or coastal waters,
e) 200 feet from normal high water between high rate infiltration unit and any C1assI or Class II
impounded reservoir used as a source of drinking water,
f) 200 feet between high rate infiltration unit and any other lake or impoundment,
g) 200 feet between high rate infiltration unit and any Drainage systems (ditches, drains, surface
water diversions, etc.) and from any groundwater lowering and surface drainage ditches,
h) 100 feet between high rate infiltration unit and property lines,
i) 50 feet between treatment units and property lines, and
j) 50 feet between high rate infiltration unit and other treatment units and public right of ways.
Some of the buffers specified above may not have been included in previous permits for this
waste treatment and disposal system. These buffers are not intended to prohibit or prevent
modifications, which are required by the Division, to improve performance of the existing
treatment facility. These buffers do, however, apply to modifications of the treatment and
disposal facilities which are for the purpose of increasing the flow that is tributary to the
facility. These buffers do apply to any expansion or modification of the high rate infiltration
areas and apply in instances in which the sale of property would cause any of the buffers now
complied with, for the treatment and disposal facilities, to be violated. The applicant is
advised that any modifications to the existing facilities will require a permit modification.
2

A usable green area shall be maintained for wastewater disposal. The green area shall have the
capability of accommodating the average daily flow of the facility being served without exceeding
the loading rates of the green area. A "green area", as defined in 15A NCAC 2H .0404 (g)(7), is
an area suitable for waste disposal, either in its natural state or which has been modified by
planting a vegetative cover of grasses or low growing shrubbery. A minimum of 34.4 acres of
green area suitable for use for wastewater treatment and disposal shall be maintained at all times.
H. OPERATION AND MAINTENANCE REQUIREMENTS
The facilities shall be properly maintained and operated at all times.
Upon classification of the facility by the Water Pollution Control System Operator Certification
Commission (WPCSOCC), the Permittee shall employ a certified wastewater treatment plant
operator to be in responsible charge (ORC) of the wastewater treatment facilities. The operator
must hold a certificate of the type and grade at least equivalent to or greater than the classification
assigned to the wastewater treatment facilities by the WPCSOCC. The Permittee must also
employ a certified back-up operator of the appropriate type and grade to comply with the
conditions of 15A NCAC 8A .0202. The ORC of the facility must visit each Class I facility at
least weekly and each Class 11, III, and IV facility at least daily, excluding weekends and holidays,
and must properly manage and document daily operation and maintenance of the facility and must
comply with all other conditions of 15A NCAC 8A.0202.
The application rates for the high rate infiltration system shall not exceed 7.65 gallons per square
foot for the rotary distributors.
The facilities shall be effectively maintained and operated as a non -discharge system to prevent
the discharge of any wastewater outside of the high rate infiltration disposal area, which result
from the operation of this facility.
No traffic or equipment shall be allowed on the disposal area except while installation occurs or
while normal maintenance is being performed.
6. The rotary distribution fields shall be raked twice weekly during the months April through
October and once a week during the months of November through March.
The screenings removed from the wastewater treatment plant shall be properly disposed in a
sanitary landfill or by other means which have been approved by this Division.
Vegetative growth must be kept out of the rotary distribution areas at all times. All vegetation
must be removed manually so that minimal disturbance will occur to the disposal area. There
shall be no "Rototillers" used on the rotary distribution fields.
9. The application of chemicals to the distribution field(s) is expressly prohibited.
10. An automatically activated standby power source shall be on site and operational at all times. If a
generator is employed as an alternate power supply, it shall be tested weekly by interrupting the
primary power source.
11. The flow measurement device shall be calibrated annually by a representative of a firm which is
routinely engaged in the calibration of flow measurement devices. Records of this calibration,
including all information pertinent to the calibration, shall be available during any inspection by
Division staff.

12. Diffusers shall be cleaned as needed to ensure that adequate aeration is provided. Records of this
maintenance shall be maintained by the permittee.
13. The chlorine tablets used in the disinfection facility shall be of the kind and type specified in the
plans and specifications approved by the Division.
14. The elevation of the base of each rotary distributor shall be at least 13 feet above mean sea level
(A.M.S.L.).
15. Should the application of treated wastewater to either disposal system result in the breakout of
wastewater at any point less than 200 feet from the outer edges of the disposal system, the County
of Currituck must restructure the site or modify the system's operation to eliminate the discharge.
III. MONITORING AND REPORTING REQUIREMENTS
1. Any monitoring deemed necessary by the Division to insure surface and ground water protection
will be established and an acceptable sampling reporting schedule shall be followed.
2. As an indicator of proper operation and maintenance, the facility shall produce an effluent in
compliance with the following limitations:
e
Parameter Monthly Average Daily Maximum
Flow 480,000 GPD
BODS (5 -day, 20°C) 10 mg/1 15 mg/1
NH3 as N 4 mg/1 6 mg/l
TSS 20 mg/1 30 mg/1
b
Fecal Coliform 14 per 100 ml 43 per 100 ml
Monthly averages for all but fecal coliform shall be the arithmetic mean of all samples
collected during the reporting period.
b
Monthly average for fecal coliform shall be the geometric mean of all samples collected during
the reporting period.
Daily maximum shall be the maximum value of all samples collected during the reporting
period.
The effluent from the subject facilities shall be monitored, by the Permittee, at the point prior to
discharge to the rotary distributor for the following parameters:
Parameter
Sampling Point
Sampling Frequency
Type of Sample
Flow
Influent or Effluent
Continuous
Recording
BODS (5 -day, 20°C)
Effluent
*2/Month
Composite
NH3 as N
Effluent
' 2/Month
Composite
TSS
Effluent
*2/Month
Composite
Fecal Coliform
Effluent
*2/Month
Grab
Settleable Matter
Effluent
Daily
Grab
Residual Chlorine
Effluent
Daily
Grab
NO3 as N
Effluent
*2/Month
Composite
TDS
Effluent
**Quarterly
Composite
TOC
Effluent
** Quarterly
Grab
Chloride
Effluent
** Quarterly
Composite
4

The effluent pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
* 2/Month sampling frequency only during the months of April through October. During the
remainder of the year, these parameters shall be monitored monthly.
** Quarterly sampling frequency shall correspond with quarterly monitoring of wells required by
Groundwater monitoring conditions.
The surface waters at sites SWI, SW2, and SW3, as indicated on the attached map, shall be
monitored by the Permittee, for the following parameters:
Parameter Sampling Point Sampling Frequency Type of Sample
NH3 as SWI, SW2, SW3 *2/Month Grab
Fecal Coliform SWI, SW2, SW3 *2/Month Grab
NO3 as N SW 1, SW2, SW3 *2/Month Grab
2/Month sampling frequency only during the months of April through October. During the
remainder of the year, these parameters shall be monitored monthly.
If Groundwater sampling indicates or predicts problems with compliance with of the Groundwater
Standards, this permit will be modified to include additional and/or more restrictive limitations.
3. Three (3) copies of all effluent monitoring data and surface water monitoring (as specified in
condition III 2) on Form NDMR-1 shall be submitted on or before the last day of the month
following sampling. All information shall be submitted to the following address:
NC Division of Water Quality
Water Quality Section
Non -Discharge Compliance/Enforcement Unit
Post Office Box 29535
Raleigh, North Carolina 27626-0535
4. A record shall be maintained of all residuals removed from this facility. The record shall include
the name of the hauler, the permit authorizing the disposal or a letter from a municipality agreeing
to accept the residuals, the date the residuals were hauled, and the volume of residuals removed.
A maintenance log shall be maintained at this facility including, but not limited to, the following
items:
a. Daily sampling results including residual chlorine, settleable matter, and dissolved oxygen in
the aeration basin and at the clarifier weir;
b. Visual observations of the plant and plant site;
c. Record of preventative maintenance (changing of filters, adjusting belt tensions, alarm testing,
diffuser inspections and cleanings, etc.);
d. Date of calibration of flow measurement device;
e. Date and results of power interruption testing on alternate power supply; and
f. Dates fields were raked and arms inspected.

6. Noncompliance Notification:
The Permittee shall report by telephone to the Washington Regional Office, telephone number
[phone], as soon as possible, but in no case more than 24 hours or on the next working day
following the occurrence or first knowledge of the occurrence of any of the following:
a. Anv occurrence at the wastewater treatment facility which results in the treatment of
significant amounts of wastes which are abnormal in quantity or characteristic, such as the
dumping of the contents of a basin or tank, the known passage of a slug of hazardous
substance through the facility, or any other unusual circumstances;
b. Any process unit failure, due to known or unknown reasons, that renders the facility incapable
of adequate wastewater treatment, such as mechanical or electrical failures of pumps, aerators,
compressors, etc.;
c. Any failure of a pumping station, sewer line, or treatment facility resulting in a by-pass of all
or any portion of the influent to such station or facility; or
d. Any time that self-monitoring information indicates that the facility is not in compliance with
its permit limitations.
Persons reporting such occurrences by telephone shall also file a written report in letter form
within five (5) days following first knowledge of the occurrence. This report must outline the
actions taken or proposed to be taken to ensure that the problem does not recur.
7. The terms for this permit will be considered to be violated any time the monthly average flow for
any month exceeds the design capacity of the constructed treatment and disposal facility. Once
this exceedance occurs, no additional wastewater shall be added to the system until the facility is
expanded.
8. Within 60 days following any single month in which the monthly average flow equals or exceeds
80% of the design capacity of the constructed treatment/disposal system, a permit amendment
must be requested and received by the Division prior to the disposal of any additional wastewater.
IV. GROUNDWATER REQUIREMENTS
1. Three (3) monitoring wells (MW -1, MW -2, MW -3) are to be maintained at the locations
indicated on the attached. Each well is to be screened three to thirteen feet Above Mean Sea
Level (AMSL) and installed with continuous water level recorders.
2. Five (5) monitor wells (MW -4 through MW -8) are to be maintained (at the locations indicated on
the attached site map (dated 12/92 and modified 3/2/93). Each well will be screened as follows:
MW -4 screened from 0 to 7 ft AMSL
MW -5 screened from 0 to 7 ft AMSL
MW -6 screened from 0 to 7 ft AMSL
MW -7 screened from 0 to 7 ft AMSL
MW -8 screened from -10 to —5 ft AMSL

From April through October water level shall be measured weekly, and from November through
March, water level shall be measured monthly. The monitor wells shall be sampled in February,
July, September, and December for the following parameters:
NO3 (10.0) TDS (500.0)
TOC pH (6.5-8.5)
Ammonia Nitrogen Chloride (250.0)
Fecal Coliforms (1.0)
Water Level
Volatile Organic Compounds - December and February only (by Method 1 or Method
2 below)
Numbers in parentheses are maximum allowable concentrations in milligrams per liter at the
compliance boundary.
(A) Standard Method 6230D, PQL at 0.5 ug/L or less
(B) Standard Method 6210D, PQL at 0.5 ug/L or less
(C) EPA Method 8021, Low Concentration, PQL at 0.5 ug/L or less
(D) EPA Method 8260, Low Concentration, PQL at 0.5 ug/L or less
(E) Another method with prior approval by the Groundwater Section Chief
Any method used must meet the following qualifications:
(1) A laboratory must be DWQ certified to run any method used.
(2) The method used must, at a minimum, include all the constituents listed in Table VIII of
Standard Method 6230D.
(3) The method used must provided a PQL at 0.5 ug/L or less which must be supported by
laboratory proficiency studies as required by the DWQ Laboratory Certification Unit.
Any constituents detected above the MDL but below the PQL at 0.5 ug/L must be
qualified (estimated) and reported.
The measurement of water level must be made prior to sampling for the remaining parameters.
The depth to water in each well shall be measured from the surveyed point on the top of the
casing.
If TOC concentrations greater than 10 mg/1 are detected in any monitor well, additional sampling
and analysis must be conducted to identify the individual constituents comprising this TOC
concentration.
6. If any volatile organic compounds are detected by the methods listed, then the Washington
Regional Office Groundwater Supervisor, telephone number [phone], must be contacted
immediately for further instructions regarding any additional follow-up analyses required. The
results of all initial and follow-up analyses must be submitted simultaneously.
Four (4) monitor wells (or piezometers) (P -I through P-4) shall be maintained as indicated on the
attached site map. These monitor wells shall be measured for water level only every Monday
from April through October. From November through March, water level shall be measured
monthly.
The results of the sampling and analysis must be received on Form- GW -59 (Groundwater
Quality Monitoring: Compliance Report Form) by the Groundwater Section, Permits and
Compliance Unit, P.O. Box 29578 Raleigh, N.C. 27626-0578 on or before the last
working day of the month following the sampling month.

9. By the last day of each month, May through November, the permittee will submit four (4) scaled
maps of the four (4) weekly water level elevation along with the Monitoring Report Forms. All
data will be included on the maps and the continuous tapes of water level recorded from MW -1,
MW -2, and MW -3 will be submitted at this time.
10. By December 31 of each year the permittee will submit and maintain on file, a report that includes
but not limited to the following:
a. water level data collected during the preceding year,
b. groundwater quality monitoring parameters, and
c. continuous water level logs.
An evaluation of the disposal facility will be included along with maps showing water level
contours, water quality isochrons, and cross sections relative to land surface. This report will be
sent to the Groundwater Section, Permits and Compliance Unit, P.O. Box 29578 Raleigh,
N.C. 27626-0578 and will be certified by a Professional Engineer or Geologist.
11. The Permittee shall report by telephone to the Washington Regional Office, telephone no. (919)
946-6481, as soon as possible, but in no case later than the next working day following the
occurrence, or first knowledge of the occurrence, of any of the following:
a) Exceedance of groundwater quality standards in any of the monitor wells.
b) Any time that self-monitoring information indicates that the facility is not in
compliance with the conditions and limitations if this permit or the parameters
on which the system was designed.
C) Any process unit failure, due to known or unknown reasons, that render the
facility incapable of adequate treatment.
d) Any occurrence of surface ponding or runoff within 200 feet of the rotary
distributors.
12. The Compliance Boundary delineated on the attached site map for the disposal system is specified
by regulations in 15A NCAC 2L, Groundwater Classifications and Standards. An exceedance of
Groundwater Quality Standards beyond the Compliance Boundary is subject to the penalty
provisions applicable under General Statute 143-215.6(1)a.
Any sale or transfer of property that affects the location of the compliance boundary shall be
reported immediately to the Director. The permittee shall not transfer land within an established
compliance boundary unless the permittee has satisfied all the requirements of 15A NCAC 2L
.107 (e and f).
13. The REVIEW BOUNDARY delineated on the attached site map (dated 12/92 and modified
3/2/93) for the disposal system is specified by regulations in 15 NCAC 2L, Groundwater
Classifications and Standards. A REVIEW BOUNDARY is established around disposal systems
midway between the Compliance Boundary and the perimeter of the waste disposal area. When
the concentration of any substance equals or exceeds the maximum allowable concentration of that
substance at the REVIEW BOUNDARY, as determined by monitoring, the permittee shall either
(i) demonstrate, through predictive calculations or modeling, that natural site conditions, facility
design and operational controls will prevent a violation of standards at the Compliance Boundary;
or, (ii) submit a plan for the alteration of existing site conditions, facility design or operational
controls that will prevent a violation of standards at the Compliance Boundary, and implement that
plan upon its approval by the Director.
14. Any groundwater quality monitoring as deemed necessary by the Division of Water Quality shall
be provided.

V. INSPECTIONS
1. Adequate inspection, maintenance, and cleaning shall be provided by the Permittee to insure
proper operation of the subject facilities.
2. The Permittee or his designee shall inspect the wastewater treatment and disposal facilities to
prevent malfunctions and deterioration, operator errors and discharges which may cause or lead to
the release of wastes to the environment, a threat to human health, or a nuisance. The Permittee
shall maintain an inspection log or summary including at least the date and time of inspection,
observations made, and any maintenance, repairs, or corrective actions taken by the Permittee.
This log of inspections shall be maintained by the Permittee for a period of three years from the
date of the inspection and shall be made available to the Division or other permitting authority,
upon request.
3. Any duly authorized officer, employee, or representative of the Division may, upon presentation
of credentials, enter and inspect any property, premises or place on or related to the disposal site or
facility at any reasonable time for the purpose of determining compliance with this permit, may
inspect or copy any records that must be maintained under the terms and conditions of this permit,
and may obtain samples of groundwater, surface water, or leachate.
VI. GENERAL CONDITIONS
This permit shall become voidable unless the facilities are constructed in accordance with the
conditions of this permit, the approved plans and specifications, and other supporting data.
2. This permit is effective only with respect to the nature and volume of wastes described in the
application and other supporting data.
This permit is not transferable. In the event there is a desire for the facilities to change ownership,
or there is a name change of the Permittee, a formal permit request must be submitted to the
Division accompanied by an application fee, documentation from the parties involved, and other
supporting materials as may be appropriate. The approval of this request will be considered on its
merits and may or may not be approved.
4. The subject wastewater treatment and disposal facilities shall be connected to an operational
publicly owned wastewater collection system within 180 days of its availability to the subject
facilities, if the subject wastewater treatment or disposal facilities are in noncompliance with the
terms and conditions of this non -discharge permit or the governing statutes or regulations. Prior to
the initiation of these connection activities, appropriate approval must be received from this
Division.
The annual administering and compliance fee must be paid by the Permittee within thirty (30)
days after being billed by the Division. Failure to pay the fee accordingly may cause the Division
to initiate action to revoke this permit as specified by 15A NCAC 2H .0205 (c)(4).
Failure to abide by the conditions and limitations contained in this permit may subject the
Permittee to an enforcement action by the Division in accordance with North Carolina General
Statute 143-215.6A to 143-215.6C.
7. The issuance of this permit does not preclude the Permittee from complying with any and all
statutes, rules, regulations, or ordinances which may be imposed by other government agencies
(local, state, and federal) which have jurisdiction.

8. A set of approved plans and specifications for the subject project must be retained by the
Permittee for the life of this project.
9. The Permittee, at least six (6) months prior to the expiration of this permit, shall request its
extension. Upon receipt of the request, the Commission will review the adequacy of the facilities
described therein, and if warranted, will extend the permit for such period of time and under such
conditions and limitations as it may deem appropriate.
Permit issued this th wenty-first day of January, 1999
NORTH OLIVA ENV�,I�iO MEn►�1 AL MANAGEMENT COMMISSION
A. Preston Howard, Jr., P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number WQ0000185
10

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