NC0028916_Pretreatment Inspection_20040311

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
Coleen H. Sullins, Deputy Director
Division of Water Quality
March 11, 2004
5350
Mr. Joseph Shields
Town of Troy WWTP
650 Glen Rd.
Troy, NC 27371-
SUBJECT: Laboratory Certification Maintenance Inspection
Dear Mr. Shields:
DENS' ®F
MAR .1 2 2004
Enclosed is a report for the inspection performed on February 25, 2004 by Ms.
Tonja Springer. Where deficiencies are cited in this report, a response is required as well
as for all lettered comments and/or recommendations. Within thirty days of receipt, please
supply this office with a written item for item description of how these deficiencies,
comments and/or recommendations were corrected. If the deficiencies cited in the
enclosed report are not corrected, enforcement actions will be recommended. For
certification maintenance, your laboratory must continue to carry out the requirements set
forth in 15A NCAC 2H .0800.
Copies of the checklists completed during the inspection may be requested from this
office. Thank you for your cooperation during the inspection. If you wish to obtain an
electronic copy of this report by email, or if you have questions or need additional
information please contact us at 919-733-3908.
Sincerely,
Prad 6Ar
James W. Meyer
Laboratory Section
Enclosure
cc: Tonja Springer
Fayetteville Regional Office
N. C. Division of Water Quality Laboratory Section 1623 Mail Service Center Raleigh, North Carolina 27699-1623 [phone]
AVA
NCDENR
FAX: [phone]

On -Site Inspection Report
LABORATORY NAME: Town of Troy WWTP
ADDRESS: 650 Glen Road
Troy, NC 27371
CERTIFICATE NO: #5350
DATE OF INSPECTION: February 25, 2004
TYPE OF INSPECTION: Field Certification Inspection
EVALUATOR: Ms. Tonja Springer
LOCAL PERSON CONTACTED: Mr. Joseph Shield
I. INTRODUCTION:
This laboratory was inspected to verify its compliance with the requirements of 15A NCAC 2H .0800 for
the analysis of environmental samples.
II. GENERAL. COMMENTS:
The inspection consisted of reviewing data for NPDES # NC0028916.
Guidance documents were given during the inspection for all certified parameters.
Comment An amendment form was submitted to change the contact from Mr. Dean Gaster to Mr.
Joseph Shields.
Comment: The plant has recently gone to a UV disinfection system, it was discussed that there is a
possibility that chlorine may be dropped on the new permit. Please submit an amendment form to drop.
this parameter if it is removed from the plant's permit.
III. DEFICIENCIES, REQUIREMENTS, COMMENTS AND RECOMMENDATIONS,:
Total Residual Chlorine:
A. Comment: The laboratory reads a gel standard (0.82. mg/L) daily but has not established a curve to
verify the equipment's capability.
Requirement: The lab may demonstrate the linearity of the instrument by analyzing a three point
documentation daily, or they may analyze five standards once per year and analyze a single standard
once per day after the annual verification. Please submit a copy of the curve with the response.
Recommendation: Since the laboratory does not have a permit limit, a curve in the range of 0.100
mg/L - 2.0 mg/Lis recommended.
Note: The range of the curve would depend on the range of the samples.
Requirement: For analytical procedures requiring analysis of a -series of standards, the concentrations
of these standards must bracket the concentration of the samples analyzed. One of -the standards
must have a concentration equal to the laboratory's lower reporting concentration for the parameter
involved. Reference: 15A NCAC 02H .0805 (a) (7) (I).

Page 2
Town of Troy WWTP
Comment: Purchased "Gel -type standards may be used for daily calibration verification only. The
standard will need to be verified annually with the standard curve. The obtained reading will be used
as the true value. It is recommended that the check standard be at mid -range or higher concentration
and should be within 10% of the known value.
pH:
Recommendation: It is recommended that the temperature sensor be calibrated annually even if it is
not being used to report temperature.
Comment: To check the temperature sensor, you would need to read the temperature and buffer
reading at two different temperatures and document the results in a notebook. The readings should be
same at the different temperatures.
Comment: "pH measurements are affected by temperature in two ways: mechanical effects that are
caused by changes in the properties of the electrodes and chemical effects caused by equilibrium
changes. "Because chemical equilibrium affects pH, standard pH buffers have a specified pH at
indicated temperatures. " Always report temperatures at which pH is measured. Reference Standard
Methods 18th Edition 4500- H+B (1) (b) p 4-66.
IV. PAPER TRAIL INVESTIGATION:
A paper trail was conducted at this facility. This consisted of comparing laboratory bench data with
DMR reports. There were no transcription errors detected.
V. CONCLUSIONS:
Correcting the above cited comments and implementing the recommendations will help this lab to
produce quality data and meet certification requirements. Please respond to all lettered comments
and recommendation.
Report prepared by: Tonja Springer Date: March 1, 2004