NC0055786_Permit (Modification)_19910807

NPDES DOCIMENT !;CANNINL COVER SHEET
NPDES Permit:
NC0055786
Lexington Regional WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
August 7, 1991
This document is printed on reuse paper - ignore any
content ors. the reirerse side

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27604
James G. Martin, Governor George T. Everett, Ph.D.
William W. Cobey, Jr., Secretary
August 7, 1991
Mr. R. Duke Whisenant, City Manager
City of Lexington
22 W. Center Street
Lexington, NC 27292
Subject: Instream Monitoring Requirements for Abbotts Creek WWTP
NPDES No. NC0055786
Davidson County
Dear Mr. Whisenant:
Director
I am writing in response to your letter of June 24 in which you requested reduced instream
monitoring. Your monitoring requirements were outlined correctly in the NPDES permit. Since
you are immediately upstream of High Rock Lake which has nutrient problems, frequent nutrient
monitoring was included in the NPDES permit. However, I will allow reduced nutrient monitoring
during the winter months. By this letter your NPDES permit monitoring requirements have been
changed as follows: (1) Monitoring for TKN, nitrate -nitrite, orthophosphorus, and total
phosphorus may be reduced to monthly from October 1 to April 30 at your upstream sampling
site at Abbotts Creek at 1-85 and at your downstream monitoring site on Abbotts Creek at Highway
47. (2) Instream BOD5 monitoring may be dropped at all sampling sites. I have attached a table
which outlines the sampling sites, what parameters should be sampled, and the frequency of
sampling. Please attach this letter to your copy of your NPDES permit.
If you have any questions or comments regarding this information, please contact Ruth Swanek of
our Instream Assessment Unit at [phone].
Sncerely,
I
George T. Eve sett
Attachment
cc: Steve Mauney
Dale Overcash
RAtlh,Swanek
Central Files
Pollution Prevention Pays
P.O. fax 29535, Ralcish, North Carolina 27626-0535 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

0
Monitoring Schedule for the City of Lexington
Sampling Site
Abbotts Ck at 1-85
Parameters
DO, temp, pH, conductivity
Fecal coliform, NH3
TKN, NOx, TP, Ortho-P
,
Frequency
3/week May -Sept)
1/week (rest of year)
1/week (year round)
1/week (May -Sept)
1/month (rest of year)
Comments
Abbotts Ck at Hwy 47
DO, temp, pH, conductivity
Fecal coliform, NH3
TKN, NOx, TP, Ortho-P
3/week May -Sept)
1/week (rest of year)
1/week (year round)
1/week (May -Sept)
1/month (rest of year)
Measurements in 1 M
Vertical increments
Measurements at surface
Measurements at surface
Abbotts Ck at US 29/70
DO, temp, pH, conductivity,
fecal coliform, NH3, TKN,
NOx, Ortho-P, TP
1/week (May -Sept)
Leonard Ck at mouth
DO, temp, pH, conductivity,
fecal coliform, NH3, TKN,
NOx, Ortho-P, TP
1/week (May -Sept)
Stage and time of day should be recorded for all measurements at Hwy 47.

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
P.O. Box 27687
Raleigh, NC 27611
WATER QUALITY SECTION
FAX # [phone]
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FAX NUMBER: Lglq) 1Le 1 — OD 13
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State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27604
James G. Martin, Governor George T. Everett, Ph.D.
William W. Cobey, Jr., Secretary Director
July 31, 1991
Mr. R. Duke Whisenant, City Manager
City of Lexington
22 W. Center Street
Lexington, NC 27292
Subject: Instream Monitoring Requirements for Abbotts Creek WWTP
NPDES No. NC0055786
Davidson County
Dear Mr. Whisenant:
I am writing in response to your letter of June 24 in which you requested reduced instream
monitoring. Your monitoring requirements were outlined correctly in the NPDES permit. Since
you are immediately upstream of High Rock Lake which has nutrient problems, frequent nutrient
monitoring was included in the NPDES permit. However, I will allow reduced nutrient monitoring
during the winter months. By this letter your NPDES permit monitoring requirements have been
changed as follows: (1) Monitoring for TKN, nitrate -nitrite, orthophosphorus, and total
phosphorus may be reduced to monthly during October to April at your upstream sampling site at
Abbotts Creek at 1-85 and at your downstream monitoring site on Abbotts Creek at Highway 47.
(2) lnstream BOD5 monitoring may be dropped at all sampling sites. I have attached a table
which outlines the sampling sites, what parameters should be sampled, and the frequency of
sampling.
If you have any questions or comments regarding this information, please contact Ruth Swanek of
our lnstream Assessment Unit at [phone].
Sincerely,
George T. Everett
Attachment
cc: Steve Mauney
Dale Overcash
Ruth Swanek
Central Files
Pollution Prevention Pays
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

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1
Monitoring Schedule for the City of Lexington
Sampling Site
Abbotts Ck at 1-85
Parameters
DO, temp, pH, conductivity
Fecal coliform, NH3
TKN, NOx, TP, Ortho-P
Frequency
3/week May -Sept)
1/week (rest of year)
1/week (year round)
1/week (May -Sept)
1/month (rest of year)
Comments
Abbotts Ck at Hwy 47
DO, temp, pH, conductivity
Fecal coliform, NH3
TKN, NOx, TP, Ortho-P
3/week May -Sept)
1/week (rest of year)
1/week (year round)
1/week (May -Sept)
1/month (rest of year)
Measurements in 1 M
Vertical increments
Measurements at surface
Measurements at surface
Abbotts Ck at US 29/70
DO, temp, pH, conductivity,
fecal coliform, NH3, TKN,
NOx, Ortho-P, TP
1/week (May -Sept)
Leonard Ck at mouth
DO, temp, pH, conductivity,
fecal coliform, NH3, TKN,
NOx, Ortho-P, TP
1/week (May -Sept)
Stage and time of day should be recorded for all measurements at Hwy 47.

OFFICE OF THE
CITY MANAGER
THE CITY OF
NORTH
•
LEXINGTON
CAROLINA
.4:-.09WING WITH THE PIEDMONT"
It ,
JUL 8 1991
Dili. OF MGMPIT.
O FiCE
June 24, 1991
Mr. George Everette
N.C. DEHNR/DEM
P.O. Box 29535
Raleigh, N.C. 27626-0535
7)
Re: Lexington Regional Wastewater Treatment Plant Instream
Monitoring Requirements - NPDES #NC0055786
Abbotts Creek - Davidson County
Dear Mr. Everette:
On behalf of the City of Lexington, I would like to request a
reduction in instream monitoring requirements listed in the
above permit similar to that granted to the City of Thomasville
in your letter dated June 18, 1991 (attached).
If the winter monitoring is unnecessary, we have other work for
our analysts which is necessary.
Sincerely,
CITY OF LEX NGTON
) AGL(14—
R. Duke Whisenant
City Manager
RDW/klb
cc: R.B. Smith
Dennis Roberts
Roger Spach
Gisele Hedrick
J UL
57 /
11 NI/ECM /'"n'-1) c-ror.CT • t ryv
\:f1DTu r t Dill T\' 1 1 71n" • DL! "7(1.1 111 1140

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27604
James G. Martin, Governor George T. Everett, Ph.D.
William W. Cobey, Jr., Secretary Director
June 18, 1991
Mr. Wade Ingram
Lab Supervisor
City of Thomasville
Thomasville, NC 27360
Subject: Thomasville WWTP Instream Monitoring Requirements
NPDES No. NC0024112
Rich Fork Creek
Davidson County
Dear Mr. Ingram:
I am writing in response to your letter of May 8 in which you requested a reduction in instream
sampling. The data that Thomasville is collecting along with that collected by High Point and
Lexington are necessary to delineate existing water quality impacts within the receiving waters and
will be invaluable to the Division of Environmental Management (DEM) in developing a water
quality management plan for the Rich Fork/Hamby/Abbotts Creek basin.
Although I understand how staff shortages may make it difficult to perform all job duties, I will not
waive monitoring at any of the sites at this time. As you are aware, the increased monitoring
requirements are a direct result of the City of Thomasville's request for a WWTP discharge into Rich
Fork Creek. Since the assimilative capacity of the basin is limited, the monitoring data will enable
the Division to continue to assess the existing facilities impacts to the receiving waters. In addition,
adequate stream data must be available before any proposed discharges or facility expansions can be
considered.
However, upon staff review of the City's daily monitoring reports (DMRs), it was noted that
samples are being collected throughout the year at each site. It was the intent of the monitoring plan
to require sampling at all five stations only during the summer months. By this letter your NPDES
permit monitoring requirements have been changed as follows: (1) During the winter, sampling
should occur on Hamby Creek at Baptist Children's Home Road and on Hamby Creek at SR 2017.
(2) BOD5 monitoring can be dropped at each of the sites. I have attached a table which outlines the
sampling sites, what parameters should be sampled, and the frequency of sampling.
After the monitoring results have been submitted for this corning summer, Thomasville may again
request that the sampling plan be re-evaluated. At that time, I will have my staff determine whether
there is enough information in the basin to remove some of the sampling sites.
Pollution Prevention Pays
P.O. Box 29535, Raleigh. North Carolina 27626-0535 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

I hope this letter adequately addresses your concerns. If you have any questions or comments,
please contact Steve Mauney or Mike Mickey of our Winston-Salem Regional Office, Ruth Swanek
of our Instream Assessment Unit, or Dale Overcash of our Permits and Engineering Unit. Steve and
Mike can be contacted at [phone], and Ruth and Dale can be contacted at [phone].
George T. Everett
GTE/RCS
Attachment
cc: Steve Mauney
Dale Overcash
Ruth Swanek
Central Files
Pollution Prevention Pays
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

f
Monitorinc schedule for the City of Thomasville
Sampling Site
Hamby Creek at
Baptist Children'E
Home Road
Hamby Creek at S
2025
Hamby Creek at F.
2025 •
Jimmys Creek at
2020
Abbotts Creek a
2010
* Sampling she
observed at any
3 times per wee
3 consecutive e
Note: Summer
defined as Novc
ters
Freauenc
DO, temp, pH, fecal
coliform,
conductivity, NH3
TKN, NOX, TP,
Orthophosphorus
Summer - 1 or
3/week*
Winter - 1/week
May -September
1/week
DO, temp, pH, fecal
coliform,
conductivity, NH3
TKN, NOx, TP,
Orthophosphorus
Summer - 1 or
3/week* t
Winter - 1/week
May -September
1/week
DO, temp, pH, fecal
coliform,
conductivity, NH3
TKN, NOx, TP,
Orthophosphorus
Summer only
1 or 3/week*
May -Sept. only
1/week
DO, temp, pH, fecal
coliform,
conductivity, NH3
TKN, NOx, TP,
Orthophosphorus _
Summer only
1 or 3/week*
May -Sept. only
1/week
R '
DO, temp, pH, fecal
coliform,
conductivity, NH3
TKN, NOx, TP,
Orthophosphorus
Summer only
1 or 3/week*
May -Sept. only
1/week
be once per week until DO standard violations are
to When this occurs, each site should be sampled
until all stations are above 5 mg/I DO for at least
s.
oefined as April through October, and winter is
per through March.

o
C t t .af g. '.ax uo it i t
Thomasville, North Carolina 27360
May 8, 1991
Mr. Sarfrit
DEM
P.Q. Box 29535
Raleigh, N.C. 276-260535
Dear Mr. Sarfrit:
The City of Thomasville is requesting a reduction of downstream
sample points. We are now sampling at up -creek Hamby and Down -
creek at -three locations. They are; 1. Hamby Creek at NCSR 2025,
2. Hamby creek at NCSR 2017, and 3. Abbotts Creek at 2010.
Additionally we are sampling Jimmy Creek at NCSR 2020.
The City has collected over two years of data on these locations
and Thomasville also performed a creek assessment on the Abbotts
creek basin in-1990. We feel we have collected enough background
data on these locations.
'The reason we are making this request is due to a reduction in
staff. The City was operating the lab with three employees, and
two of them are now gone. With a hiring freeze on we are now short
handed. After talking with Mr. Mike Mickey about this he suggested
that we make a former request to reduce our sample points. We hope
that you will take this into consideration and drop three of the
down stream sample points. This is a list of the ones we hope you
will review. 1) Hamby Creek at NCSR 2017. 2) Jimmy Creek at NCSR
2020. 3) Abbotts Creek at 2010.
We realize the importance of the Nutrient analysis of the basin.
We also realize a new NPDES permit will have to be applied for and
issued if this request is to be granted. With two years of data on
hand we hope you will consider our request and let us Know soon as
possible your decision. Thank you for your time and effort.
Sincerely
224,-t
Wade Ingram, Lab Supervisor
ss/MWI