NCD980602163_19830325_Warren County PCB Landfill_SERB C_Section 2 - Conclusions-OCR

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SECTION 2
CONCLUSIONS
The conclusions drawn for results of this study are surranarized below.
: (1) The principal source of emissions from the landfill originate from
,·. · the main vent pipe. The average PCB concentrations of Aroclor 1242
and Aroclor 1260 measured in the main vent emissions during the
study were 123,000 ng/scm ("'100 ppb) and ?,000 ng/scm (""2 ppb),
respectively. These concentrations are substantially lower than
the current occupational standards for workplace atmospheres which
range from 0.4 to 0.8 ppm.
(2) Ambient air PCB levels on and surrounding the landfill site (even
as close as one metec from the main vent) were found to be at or
below minimum detection limits (6 to 10 ng/m3) for the sampling
method. PCB levels generally present in the atmosphere throughout
the U.S. are in the range of 5 to 10 ng/m3.
(3). Mathematical modeling predicts that ambient air PCB concentrations
on and in the vicinity of landfill resulting from the main vent
pipe emissions may be approximately 106 to 109 times lower than the
detection limits for sampling method used in this study. PCB
contributions to the ambient air from the landfill based on the
model predictions are insignificant whe~ com~ared to general
ambient air PCB levels in the U.S.
(4) It is anticipated that the low PCB emission rate from the landfill
will be reduced still further as decay of organic matter producing
the me t hane and other gases emanating from the vents subsides. The
reduct foh-of hydrauli-c pressure by removal of water from the site
should also reduce emission rates substantially.
2
Mr. O.W. Strickland
ENVIRONMENTAL PROTECTION AGENCY
REGION JV
SURVEILLANCE AND ANALYSIS DIVISION
ATHENS, GEORGIA 30601
Solid and Hazardous Waste Management Branch
Division of Health Services
North Carolina Department of Human Resources
P.O. Box 2091
Raleigh, NC 27602
Dear Mr. Strickland:
March 25, 1983
.... ~,.
As I discussed with you in our telephone conversation of this date,
I am sending a copy of the preliminary data collected during our PCB study
in Warren County. Note that the cover memo from Dr. Robert Lewis projects
a final report date of March 28. Acopy of the report will be forwarded
to you immediately upon its clearance for release.
Should you have any questions, please feel free to call at 404/546-3197.
Yours truly,
,_1;,ty1£o ()itJ.L/J ;::_-:__ ~ 'James C. Gray
'. DATE
SUBJECT:
F ROM:
TO
MAR 1. 6 1983
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY NAR 'i119iJ
March 8, 1983 RESEARCH TRIANGLE PARK, N. C. 27711
Warren County, North Carolina, Site Monitoring
Dr. Robert G. Lewis, Chief ~,,/2_ •
Advanced Analysis Techniques Branch, {~S~P (MD-44)
Mr. Doyle T. Brittain
Environmental Services Division
U.S. EPA Region 4
Athens, GA. 30613
Attached are the monitoring data for January 26, 28, and 29, 1983 from
the Warren County Landfill, which were delivered to me by Battelle today
(March 8). Final values are expressed in nanograms per standard cubic
meter (ng/scm), corrected to 25°C. Note that ambient air sampling on
January 26 was performed with the main vents blocked while vent samples
were simultaneously being taken; therefore, little, if any, PCB was being
released with the air. On January 29, however, no vent sampling was done,
so that ambient air monitoring for that day is valid.
I talked to Southwest Research today and determined that they have
resolved the ·chemical contamination problems associated with the January 27
samples and will have those numbers to report to Battelle by the end of
the week.
We have given Battelle the results of flow measurements made on March 2,
so that they can calculate mass fluxes. They will also do some dispersion
modelling. James Howes of Battelle projects completion of the report in
about two weeks after receipt of the final data; i.e., on or about March 28.
Please call if you have questions.
Attachment
EPA Fo,m 1320-6 (R~v. 3-761
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AIR SAMPLING AT THE WARREN COUNTY LANDFILL
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What Are The Air Sampling Results?
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January 14, 1983
Two sets of air samples taken during the last ten days at the Warren County
landfill have turned up only minute amountsof PCB in one of the landfill's venting
pipes, and in a pipe leading from the leachate collection system. State Health
Director Dr. Ronald H. Levine and other environmental and public health experts
said the PCB poses no threat to public health or to the environment.
Two venting pipes and the leachate collection system at the landfill were
sampled on Thursday, January 6, by DHR personnel to determine if gas passing
through the pipes contained PCB. The landfill contains several venting pipes which
release methane gas produced by the decomposition of grass and other biodegradable
materials. No PCB was detected in one venting pipe, and extremely small amounts were
detected /in the main venting pipe and a pipe leading from the leachate collection system.
Gas in the main venting pipe in the middle of the landfill contained 15.2
micrograms per cubic meter (about 3 parts per billion) of PCB. Gas in the leachate
collection pipe contained about 1.3 micrograms per cubic meter (less than one part
per billion) of PCB. The OSHA standard for PCB in the workplace is 500 micrograms
per cubic meter.
Additional ambient air samples, and one venting pipe sample, were taken on
Wednesday, January 12. None of the five samples of air around the landfill contained
levels of PCB that were detectable on the state's sampling equipment. The venting
pipe sample, from the same main venting pipe, registered 10 micrograms per cubic
meter (about 2 parts per billion).
What Do The Results Mean?
Samples taken inside the main venting pipe of the landfill, and a leachate
collection pipe, contain extremely small, but detectable levels of PCB. The levels
are well below the OSHA standard, and pose no threat to human health or to the
---environment. No PCB was detected in any of the air outside the pipes that might be breathed by anyone working at the landfill, or living nearby. Nevertheless, to further ensure that the PCB in the pipes will cause no health problems for the people of Warren County, DHR's Division of Health Services has asked the EPA to conduct an independent air sampling survey at the landfill, using the most advanced air sampling equipment available. ###