NC0028941_Permit (Modification)_19990521

NPDES DOCUMENT SCANNIMO COVER SHEET
NPDES Permit: NC0028941
Pine Valley WWTP
Document Type: Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Speculative Limits
Complete File - Historical
Instream Assessment (67B)
Environmental Assessment (EA)
Permit
History ,
Document Date: May 21, 1999
This document is printed on reuse paper-igazore any
content oa the reverse side

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State of North Carolina
Department of Environment
and Natural Resources ANWs
Division of Water Quality
L
James B. Hunt, Jr., Governor NCDENR
Wayne McDevitt, Secretary
Kerr T. Stevens, Director
May 21, 1999
Mr. Leonard E. Stogner
" Rayco Utilities, Inc., .- _.
107 Commercial Park Drive
Concord, North Carolina 28027
Subject: Permit Modification
Rayco Utilities, Inc.-Pine Valley Subd.
NPDES Permit No. _NC0028941
Rowan County
Dear Mr. Stogner
In accordance with your request for modification of the downstream monitoring site for the
subject facility, the NPDES staff has reviewed the alternative location. We have investigated whether
the required site of 300 feet downstream is safely accessible. Based on information received, the
Division recommends downstream monitoring at the site where you are currently sampling,
approximately 20 feet below the discharge. All parameters and monitoring frequencies will remain the
same as in the current permit. Accordingly, we are forwarding herewith this modification to the subject
permit.
Also, please be aware that the Division is awaiting your response on the submission of the
engineering alternatives analysis (EAA) and plans and specs for the installation of the chlorination
system. Your.April 8`h letter addressing the Compliance Evaluation Inspection Report indicates that all
necessary information will be forwarded by_June V 1999. It is imperative that the Division receive the
EAA and plans by that date.
Please find enclosed the amended Effluent page for outfall 001, which should be inserted into
your permit. The old pages should be discarded. This permit is issued pursuant to the requirements of
North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina
and the U.S. Environmental Protection Agency.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10%-post-consumer paper

Permit No. NC0028941
Rayco Utilities, Inc.- Pine Valley Subdivision
May 21, 1999
Page 2
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. 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, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such
a demand is made, this permit shall be final and binding.
If you have any questions or need additional information, please contact Jacquelyn M. Nowell at
telephone number [phone], extension 512.
Sincerely,
err T. Stevens
cc: Central Files
Mooresville Reeional Office
NPDES Unit

All). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL Permit No. NC0028941
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfall serial number
001. Such discharges shall be limited and monitored by the Permittee as specified below:
EFFLUENT CHARACTERISTICS , * y LIMITS` MONITORING REQUIREMENTS
��, ¢ n 41
6
i Monthly Weekly., Daily Maximum Measurement Sample Sample
Location Average Average Fre uenc . r " t
T e
Flow,MGD 0.025 Weekly Instantaneous I or E
BOD5 10.0 mg/I 15.0 mg/I Weekly Grab E
Total Suspended Solids 30.0 m /I 45.0 m /I Weekly Grab E
NH3 as N 4.0 m /I Weekly Grab E
Hz. Weekly Grab E
Dissolved Oxygen3 Weekly Grab E,U,D
Fecal Coliform (geometric mean) 200/100 ml 400/100 ml Weekly Grab E,U,D
Total Residual Chlorine 2/Week Grab E
Temperature°C Daily Grab E
Temperature eC Weekly Grab E,U,D
Conductivity Weekly Grab U,D
Notes:
i Sample Locations: E- Effluent, I - Influent, U—Upstream at least 100 feet, D—Downstream at least 20 feet.
2 The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
3 The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/I.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

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DIVISION OF WATER QUALITY
April 13, 1999 r -
MEMORANDUM :;a
TO: Dave Goodrich
�.,
FROM: D. Rex Gleason
r.:
PREPARED BY: Richard Bridgemann `
SUBJECT: Request for downstream sampling point relocation
Rayco Utilities, Inc.
Pine Valley Subdivision WWTP
NPDES Permit No. NCO028941
Rowan County
Enclosed please find a copy of a response to a Compliance Evaluation Inspection Report
for the subject facility. In the response a request (see highlighted text) is made to modify the
downstream sampling location specified in the current permit. The specified point is 300 feet at
least downstream of the discharge point. As noted in the request, there is a railroad track which
intersects the area between the specified sampling point and the discharge point. Although not
noted in the response, the approximately 20-foot high railroad embankment and 24-36 inch
culvert are only 15-20 feet from the discharge pipe. Although the discharge point is near the
head of Setman Branch, which is given a statistical 7Q10 flow of zero, in fact the branch is
spring fed and has a good flow year-round; so some mixing is occurring in the 15-20 feet prior to
the point at which the ORC presently collects downstream samples.
This Office makes no recommendation relative to the request. The site statistics are given
above; we defer to your judgement. Call if you have questions.
Enclosure
RMB
HA W P W IMDOC\MEMO\PINEVALL.PMT

THE ENVIRONMENTAL GROUP
E.W.S., INC. PRECISE ANALYTICAL He RESEARCH LABS RAYCO UTILITIES, INC. .
l'
7 April 8, 1999
Mr. Richard Bridgeman ee NA T
NC Dept. of ENR-DWQ
Mooresville Reeional Office
919 North Main Street
Mooresville,NC 28115 6•` ! -•: -
CtSifi:
RE: Pine Valley SD WWTP
NPDES NCO028941
CEI-NOV dated April 1,1999
Dear Mr. Bridgeman:
I am in receipt of the above referenced document and offer the following in
response:
Permit :
We apologize for failing to provide you with the engineering alternatives analysis
and the plans and specifications for an adequate disinfection system as required by our
permit. This was an oversight on our part and was not intentionally omitted. We have
retained Mr. Thurman Horne, P.E. to prepare both of these items and submit them to you
within 60 days from the date of this letter. Again we apologize for this oversight and trust
this timetable is acceptable to you, however if it is not please contact me.
Records and Reports:
Aeration basin process control, for the most part, has not been documented in the
past. It has been used primarily as a daily tool to assist operators in normal operations of
their facilities. We will include the information obtained from this analysis in their daily
operations log.
Facilitv Site Review
The backup blower motor is unable to be repaired. We will install a new motor by
May 15. 1999. This facility usually has a small amount of foam on the aeration basins
and clarifier, however they remain in the treatment process and do not reach surface
waters. Microbiological samples have been studied and found to contain some
107 COMMERCIAL PARK DRIVE • CONCORD. NC 28027 • 704/786-9497 • FAX [phone]

Mr. Richard Bridgeman ,
Page 2
April 8, 1999
filamentous bacteria. The filamentous bacteria in this facility is internal, and therefore is
not detrimental to the treatment process. Solids do accumulate in the chlorine contact
chamber periodically and are pumped out as part of routine maintenance.
The chlorination system does need to be upgraded. We will upgrade this system
upon the approval of.plans and specifications referred to under the Permit section of this
letter.
Operations & Maintenance:
The blower motor will be replaced as indicated in the Facility Site Review section
of this letter.
Laboratory:
The TRC meter will be checked every day of use with a mid-point calibration
standard and the results documented.
Effluent/Receiving Waters:
It is unusual to observe any solids downstream of this facility that is the result of
this facility. Occasionally, during periods of low stream flow, there is a silt or sediment
that can be seen throughout the stream in this area. We don't know if this was the case
here, it is merely something we have observed in the past.
The high residual chlorine levels should be reduced when the disinfection system
is upgraded. We will try to maintain residual chlorine levels as low as possible in the
interim.
Self-Monitoring Program:
We regret the effluent limit violations noted in your report. We try to minimize
permit limit excedences, however, any biological wastewater treatment facility is subject
to occasional limit violations.
In the future we will indicate all effluent limit violations on the DMR.
This facility is visited daily by the ORC or a back-up operator.

Mr. Richard Bridgeman
Page 3
April 8, 1999
We request that the downstream sampling point be revised to allow the operator to
collect samples at the culvert where the stream flows under the railroad. We understand ,ram
and agree that the sampling point should ideally be further downstream, however we 1
believe the safety of the operator should be considered above the sampling point. In order
for this sample to be collected 300 feet downstream, the operator would have to scale the
railroad embankment, cross the tracks, scale down the embankment on the other side and
return, all while carrying sample bottles and meters. This is precarious in good weather,
not considering rain, mud, ice, or snow. If you are unable to grant this request, we
understand, however it would be greatly appreciated.
I trust this response is sufficient, however, should you require any additional
information please contact me at [phone].
Sincerely,
Leonard E. StoQner
Rayco Utilities, Inc.
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