NC0027103_Inspection_20020918

ATI
NCDENR
North Carolina Department of Environment and Natural Resources
Michael F. Easley, Governor
September 18, 2002
Mr. McDuffie Cummings, Town Manager
Town of Pembroke
P.O. Box 866
Pembroke, NC 28372
Subject: COMPLIANCE EVALUATION INSPECTION
Town of Pembroke Wastewater Treatment Plant
NPDES Permit No. NC0027103
Robeson County
Dear.Mr. Cummings:
9/140-a
William G. Ross, Jr., Secretary
Alan Klimek, Director
Division of Water Quality
Enclosed you will find a copy of the Compliance Evaluation Inspection report for the
inspection conducted on September 11, 2002. As part of the inspection a tour of the Wastewater
Treatment Plant was conducted. All observations and recommendations are in Part D: Summary of
Findings/Comments of this inspection report. This facility is well maintained. Keep up the good
work.
If you have any questions or comments concerning this report or require clarification on part(s)
of this report, please feel free to contact me at 910/486-1541.
Sincerely,
Dale Lopez
Environmental Specialist
/dl
cc: DWQ, ESB, ATU, Kevin Bowden
Gerry Harris, Town of Pembroke, (ORC)
Enclosure: NPDES Compliance Inspection Report
Fayetteville Regional Office
225 Green Street — Suite 714, Fayetteville, North Carolina 28301-5043
Phone: [phone]/FAX: [phone] Internet: www.enr.state.nc.us/ENR
An Equal Opportunity \ Affirmative Action Employer — 50% Recycled 110% Post Consumer Paper

Mr. Cummings
Page 2
September 18, 2002
NPDES COMPLIANCE INSPECTION REPORT
North Carolina Division of Water Quality
Fayetteville Regional Office
Section A. National Data System Coding
Transaction Code: N NPDES NO. NC0027103 Date: 020911 Inspection Type: B
Inspector: S Facility Type: 1 Reserved:
Facility Evaluation Rating: 4 BI: N QA: N Reserved:
Section B: Facility Data
Name and Location of Facility Inspected:
Town of Pembroke WWTP
Entry Time: 09:45 AM Permit Effective Date: 000601
Exit Time/Date: 01:00 PM/020911 Permit Expiration Date: 040731
Name(s), Title(s) of On -Site Representative(s):
Garry Harris, Public Works Director — (Certified Grade III) — "ORC"
Rhonda Locklear, WWTP Manager — (Certified Grade IV)
Jerry Brooks "Maintenance Operator"
Phone Number: [phone]
Name, Title and Address of Responsible Official:
Mr. McDuffie Cummings, Town Manager
Town of Pembroke
P.O. Box 866
Pembroke, North Carolina 28372
Section C: Areas Evaluated during Inspection
(S = Satisfactory, M = Marginal, U = Unsatisfactory, N = Not Evaluated, N/A = Not Applicable)
Contacted: No
Facility Site Review:
Ow. Measurement:
Laboratory:
fluent/Receiving- Waters
Pretreatment:`:
'Self -Monitoring Program:
Sludge Disposal.:,
ompliance Schedule :;N
Operation & Maintenance

Mr. Cummings
Page 3
September 18, 2002
Pembroke Wastewater Treatment Plant (WWTP)
BIOMONITORING EVALUTATION INSPECTION
performed during the week of February 5, 2001
DESCRIPTION of Pembroke WWTP:
The 1.33 MGD wastewater treatment plant consists of a mechanical bar screen, grit removal, influent
pump station, dual oxidation ditches (one ditch is being used, 534,000 gallons capacity each), dual
clarification (both are being used, 206,000 gallons capacity each), chlorine contact chamber, de -
chlorination, cascade post -aeration, and sludge digestion.
SECTION D: SUMMARY OF FINDINGS/COMMENTS:
PLANT TOUR---
1. Measurements of the clarifier sludge blankets:
#
clarifier depth
sludge blanket depth_
_clarifier
1
14 feet
0.5 feet
2
14 feet
0.7 feet
2. The aerated grit chamber was operating.
3. The screenings, grit, and grease removal were hauled to the Robeson County Landfill.
4. #1 Oxidation Ditch was in operation. #2 was not in operation. Next week the operation of the
ditched will be rotated, and will be rotated on an annual schedule. The most recent Mixed Liquor
Suspended Solids (MLSS) results were 3,700 mg/L.
5. Chlorine was flow paced and the sulfur dioxide was residual paced. The chlorine was administered
at a rate of 5 pounds per day. Sulfur Dioxide dechlorination was administered at a rate of 10 pounds
per day, at a 1:2 ratio with the chlorine.
6. The effluent Outfall 001 was easily accessible.
7. Expert Services International, Javier Varela, last calibrated the flow meter on July 24, 2002.
8. Sludge was handled by Porter Environmental, permitted through Porter, to be land applied on land
owned by Porter, at a maximum of 100,000 gallons per month.
9. • The aerobic sludge digester appeared to have a level of half -full: 250,000 gallons in the 500,000
digester.
10. The thermometer in the effluent compositor refrigerator read 5.5 ° C and was corrected to 3.5 ° C as
per the annual crosscheck with the NIST (which indicated that the thermometer +2.0 ° C higher).
The thermometer in the influent compositor refrigerator read 4.5° C.
11. Six full 150-pound chlorine cylinders were on hand, as were six full 150-pound sulfur dioxide
cylinders.
12. The clarifier launders were routinely cleaned on Thursdays or Fridays.
13. One 50-pound bag of soda ash (Na2CO3) per day was added to the WWTP for pH alkalinity
adjustment to compensate for the pH drop that occurred due to the nitrification process.
14. CP&L supplied the electricity to the WWTP. There were four generators for the lift stations and one
main generator for the WWTP.
15. The influent pump station had an Auto -Dialer for equipment failure.

Mr. Cummings
Page 4
September 18, 2002
LABORATORY TOUR---
1. Laboratory parameters that were analyzed on site: pH, Residual Chlorine, Biochemical Oxygen
Demand (BOD), Ammonia Nitrogen, Total Suspended Solids (TSS), Fecal Coliform, Dissolved
Oxygen, SOUR test, and temperature.
2. Total Nitrogen and Total Phosphorus were sent to Environmental Science Corporation in Mt. Juliet,
TN (NC Cert. #375). Mercury analysis was sent to Element One in Wilmington, NC.
3. Chronic Toxicity was analyzed by Meritech.
4. The pH buffer expiration dates:
Buffer
Date
pH 4
05/31/03
pH 10
Apri12004
pH 7
01/31/03
5. The millivolts of the 7 pH buffer was 45 mV.
6. The pH, chlorine, and dissolved oxygen analyses were performed within fifteen minutes of collection.
7. Laboratory temperatures:
Instrument
Temperature (degrees C)
BOD Incubator
20.0
Sample Refrigerator
1.0
TSS Drying Oven
104.8
Fecal Coliform
44.5
9. An NIST crosscheck of all of the thermometers was performed and documented annually.
RECOMMENDATIONS---
1. This facility is well maintained. Keep up the good work.
Name a Signature of Inspe
Dale Lopez
Name and S gn tub
Paul Rawls�
Action Taken
Agency/Office/Telephone Date
NCDENR/Fayetteville/[phone] 09/18/02
Agency/Office/Telephone Date
NCDENR/Fayetteville/[phone]
Regulatory Office Use Only
Compliance Status
_Noncompliance
_Compliance
Date
rj-