NC0085863_Nitrogen Monitoring_20040225

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20
Heater Car MacKenan Court
^ \ Cary,North!arolina 27511
Utilit1es :
phone [phone]
fax:e919.460.1788
WATER AND WASTEWATER SERVICES P.O.Drawer 4889.Cary,NC 27519
February 25, 2004
Mr. Charles Weaver
N.C. Division of Water Quality
1617 'ail Seg-vice Center
Raleigh, NC 27699-1617
Re: Nitrogen Monitoring on Well Water Filter Backwash Facilities
Dear Charles:
Enclosed please find the limits pages for the following NPDES permits
for discharge of filtered backwash water from community wells owned by Heater
Utilities, Inc. (Heater) .
System Permit No.
Hollybrook NC 0082996
Nottingham Forest NC 0055701 r;-n 2 6 2004
r , _,
Oak Hollow NC 0073679
Stanstead NC 0086690
Waterfall Plantation -'moi- NC 0085863
Each of the limits pages requires monitoring of Total Nitrogen and its
components (NO2 + NO3) and (TKN) on a semi -annual basis, which we believe is
appropriate. The limits page also requires Heater to monitor and report the
calculated value of Total Nitrogen load in pounds per month on a monthly
basis.
I assume this means that Heater can perform the tests in January and
June of each year and use this concentration to calculate the results in each
of the six months following the sample.
Unless otherwise instructed, this is the method Heater will use to
report the monthly Total Nitrogen load and add the 12 monthly results to
obtain the annual load.

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Page Two
Mr. Charles Weaver
February 25. 2004
Please advise if I need to make any changes to Heater's reporting.
Sincerely,
A31,u-ad
Je H. Tweed
Vice President
JHT/rt
cc: Ken Schuster

Permit NC0085863
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of,this permit and lasting until expiration, the Permittee is
authorized to discharge filter backwash from outfall 001. Such discharges shall be limited and monitored by
the Permittee as specified below:
EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS
Monthly Daily Measurement Sample Type Sample Location1
Average Maximum Frequency
Flow Quarterly Instantaneous Effluent
Total Suspended Solids 30.0 mg/L 45.0 mg/L Quarterly Grab Effluent
Settleable Solids 0.1 mVL 0.2 ml/L Quarterly Grab Effluent
Iron Quarterly Grab Effluent
Total Residual Chlorine2 28 Ng/L Weekly Grab Effluent
Turbidity3 Quarterly Grab Upstream&Downstream
Total Monthly Flow 4 Monitor&Report Monthly Calculated Effluent
(million gallons/month)
Total Nitrogen(TN)4 Monitor&Report(mg/L) Semi-annually Grab Effluent
Nitrate/Nitrite Nitrogen4 Monitor&Report(mg/L) Semi-annually Grab Effluent
(NO2+NO3) _
Total Kjeldahl Nitrogen(TKN)4 Monitor&Report(mg/L) Semi-annually Grab Effluent
TN load(pounds/month)4 Monitor&Report Monthly Calculated Effluent
(pounds per month)
TN load(pounds/year)4 Monitor&Report Annually Calculated Effluent
(pounds per year)
Total Phosphorus Monitor&Report(mg/L) Semi-annually Grab Effluent
Footnotes:
1. Upstream=at least 50 feet upstream from the outfall. Downstream=at least 50 feet downstream from the
outfall.
2. Limit takes effect May 1, 2005. Permittee will monitor TRC until the limit takes effect.
3. The discharge from this facility shall not cause turbidity in the receiving stream to exceed 50 NTU. If the
instream turbidity exceeds 50 NTU due to natural background conditions, the discharge cannot cause
turbidity to increase in the receiving stream.
4. See A. (2) for Total Nitrogen monitoring and reporting requirements.
All samples collected should be from a representative discharge event.
There shall be no discharge of floating solids or visible foam in other than trace amounts.
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