NC0026051_Annual Report_20011231

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PERFORMANCE ANNUAL REPORT
JULY 2001 - JUNE 2002
DURHAM COUNTY
TRIANGLE WASTEWATER TREATMENT PLANT
IntroductionI.
General Informationn.
Facility/System Name:
Durham CountyResponsible Entity:
Person in Charge/Contact
Applicable Permit(s)
Description of Collection System or Treatment Process:
Mr. Chuck Hill, P.E., Utilities Division Manager
Durham County Engineering Department
120 East Parrish Street, Suite 110
Durham, NC 27701
[phone]
Triangle Wastewater Treatment Plant
5926 NC Highway 55 East
Durham, NC 27713
NPDES-NC0026051
Land Application - WQ0007989
The collection system consists of both public and private sewer lines and pump
stations to transport the wastewater to the treatment plant. Durham County owns and
maintains approximately seventy miles of sewer piping and eleven pump stations.
All pump stations are equipped with automatic dialers that will notify an operator
when an alarm occurs. Eight of the eleven pump stations have stationary generators
for emergency power. There is a portable generator owned by Durham County for
use at stations without a permanent generator.
In an effort to keep citizens informed and to maintain compliance with state
requirements, Durham County has prepared this report summarizing the performance
of the County owned wastewater treatment plant and associated wastewater collection
system. The Treatment facility is located on NC Hwy 55 in southern Durham
County, and serves customers both inside and outside the Durham City limits,
including the Durham County portion of the Research Triangle Park (RTP).
Woodard & Curran Inc. operates and maintains the Triangle Wastewater Treatment
Plant and collection system for Durham County. The facility is a 6.0 MGD extended
aeration treatment facility discharging into Northeast Creek in southern Durham
County. The treatment facility was originally built in the early 1960’s with major
upgrades in the mid 1970’s and mid 1980’s. The facility serves commercial,
industrial, and residential customers including the section of the Research Triangle
Park located inside Durham County. The responsibility of operating the treatment
facility includes the permitting and monitoring of the industries that discharge into the
sewer system.
The wastewater treatment plant (WWTP)
are
Mercury Daily August 1
Mercury Daily August 6
Mercury Daily August 8
Mercury Daily August 13
Mercury Daily August 16
Mercury Daily August 29
Mercury Weekly August 3
Mercury Weekly August 10
Mercury Weekly August 17
Mercury Weekly August 31
❖
❖
❖
0.3 ug/L
0.3 ug/L
0.2 ug/L
0.5 ug/L
0.3 ug/L
0.7 ug/L
0.060 ug/L
0 .100 ug/L
0.160 ug/L
0.140 ug/L
0.012 ug/L
0.012 ug/L
0.012 ug/L
0.012 ug/L
Non-Compliant
Reported Value
10 ug/L
0.048 ug/L
0.048 ug/L
0.048 ug/L
0.048 ug/L
0.048 ug/L
0.048 ug/L
Sept. 2001________________
Violation
Cyanide Weekly September 20
Non-Compliant
Reported Value
782 /100ml
Non-Compliant
Reported Value
No Reportable Spill
Permit Limit
No Reportable Spill
Permit Limit
5.0ug/l
Aug. 2001
Violation
July 2001_______________________
Violation
Fecal Coliform Weekly Average July 2
Performance
System performance for the Operations year of July 2001 through June 2002 is
detailed in this section.
No Reportable Spill
Permit Limit
400/100ml
----------( was 99 71 o/o comp|jant for the reporting
period. There were seventeen (17) violations out of five thousand nine hundred
(5900) sample analyses.
Below is a summary of the types and number of violations:
❖ 12 Mercury Violations
3 Cyanide Violations
1 Fecal Coliform Violations
1 Bromodichloromethane
[Mercury and Cyanide are chemical parameters that pass through from sources and
not treated by this facility. A Consent Order was issued for the facility and seven
industrial sources where analyses indicated mercury discharges ]
The WWTP experienced no bypass flow during this reporting period. The collection
system experienced four (4) reportable spills during this year, with an estimated total of
fourteen thousand, nine hundred (14,900) gallons spilled.
Below is a compliance history of permit conditions and reportable spills by month:
Hl. PERFORMANCE (CONTINUED)
No Reportable SpillCompliantNov. 2001
No Reportable SpillCompliantDec. 2001
0.012 ug/L0.040 ug/LMercury Weekly January 4
No Reportable SpillCompliantMar. 2002
No Reportable SpillCompliantMay 2002
No Reportable SpillCompliantJune 2002
I Jan.2002 ________
Violation
B romodichloromethane
Mercury Daily January 2
Non-Compliant
Reported Value
18 ug/L
10.6 ug/L
Non-Compliant
Reported Value
1.50 ug/L
0.2 ug/L
1 Reportable Spill
Permit Limit
15.0 ug/L
5.0 ug/L
1 Reportable Spill
Permit Limit
0.85 ug/L
0.048 ug/L
Oct. 2001_________________
Violation
Cyanide Daily October 16
Cyanide Weekly October 11-18
Description of Spill: On October 15, 2001 @ # 8 Ainsworth Court a spill caused by
heavy grease blockage resulted in 100-300 gallons reaching surface water. The sewer line
was flushed with water, the spill area cleaned and lime was applied. NCDENR was
contacted in regards to spill as required.
Apr. 2002 ________________________Compliant 1 Reportable Spill
Description of Spill: On April 5, 2002, @ an easement behind 3201 Appling Way, a spill
caused by a grease blockage in line resulting in 9000 gallons reaching surface water.
Grease blockage was removed. NCDENR was contacted in regards to spill as required.
Feb. 2002 Compliant 1 Reportable Spill
Description of Spill: On February 26,2002 @ the Fairfield Pump Station, 809 Scott King
Road, a spill caused by pumps being accidentally turned off at the pump station causing a
wet well overflow resulting in 5400 gallons reaching surface water. A portable pump
was set up to pump spill from a storm drainage ditch to Fairfield Pump Station.
NCDENR was contacted in regards to spill as required._ _
Description of Spill: On January 31, 2002 @ 5113 Shagbark Drive, a spill caused by a
grease blockage accumulating on pipe fragment debris from a sprinkler system resulted in
200 gallons reaching surface water. Debris and grease were removed from the line.
NCDENR was contacted in regards to spill as required.
IV. Notification
CertificationIIL
Date
I certify under penalty of law that this report is complete and accurate to the best of
my knowledge. I further certify that this report has been made available to the users
or customers of the named system and that those users have been notified of its
availability.
The Performance Annual Report for the Durham County Triangle Wastewater
Treatment Plant, July 2001 - June 2002 was forwarded to the North Carohna
Department of Environment and Natural Resources. Public Notice of the Performance
Annual Report was advertised in the Durham Herald-Sun newspaper and is available
for review at the following locations:
♦ Durham County Web site (www.co.durham.nc.us)
♦ Durham County Library, Main Branch, 300 North Roxboro Street
♦ Durham County Library, Parkwood Branch, 5122 Revere Road
♦ Durham County Administrative Complex, Clerks Office, 200 East Main
Street.
Chuck Hill, P.E.
Utilities Division Manager
Durham County Engineering Department