.- - Gravatt, Dan
From:
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Attachments:
Hoefer, David
Thursday, February 20, 2014 1:30PM
Tapia, Cecilia; Gravatt, Dan; Field, Jeff; Hammerschmidt, Ron; Peterson, Mary
FW: News Release: Bridgeton Landfill Releases Carbon-Monoxide Monitoring Data
January CO Data.pdf
From: Merrigan, Jessie (LG) [mailto:[email protected]]
Sent: Thursday, February 20, 2014 1:15PM
To: Hoefer, David
Cc: Beck, Bill (LG)
Subject: FW: News Release: Bridgeton Landfill Releases Carbon-Monoxide Monitoring Data
Hi David,
I just wanted to keep you in the loop on this since the request for CO data had gathered substantial attention and we
think the results continue to support our long standing assessment of the condition of the North Quarry.
As always,- please let me know if you have any questions.
Thank you,
Jessie
I . ATH. ROJ)
.
&
Jessica E. Merrigan
2345 Grand Boulevard; Suite 2200 1 Kansas City, MO 64108
(~AC~L:, P: 816-460-5706 I F: 816-292-2001 I [email protected]
www .lathropqaqe.com
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40490629
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Superfund
3.D
Bridgeton Landfill Releases Carbon-Monoxide Monitoring Data
BRIDGETON, MO (Feb. 20, 2014)- The Bridgeton landfill team today filed its monthly report with the
Missouri Attorney General, Missouri Department of Natural Resources and St. louis County, which included
results from the first of three additional Carbon Monoxide (CO) samplings the landfill agreed to perform in the
North Quarry. The team sampled 25 Gas Extraction Wells throughout the North Quarry for levels of CO, which
is one of several indicators the team uses to monitor landfill conditions.
The results from the month of January confirm that all wells in the North Quarry register below the lowestpossible reporting indicators for CO. The reporting indicators were established in the North Quarry Action
Plan, which was developed in coordination with the Missouri Attorney General and Missouri Department of
Natural Resources. These results confirm previous assessments that the Subsurface Smoldering Event (SSE)
has not impacted the North Quarry, which is the area closest in proximity to the radiological materials in the
adjacent West lake landfill.
CO levels in all 25 wells sampled were below 1,000 parts per million. In 19 of the 25 wells, CO levels were nondetectable. The lack of CO indicators, together with stable temperatures, healthy well conditions and no signs
of accelerated surface settlement in the North Quarry provide further confirmation that the North Quarry
remains unimpacted by the SSE occurring in the South Quarry.
The landfill team will conduct two additional CO sampling events in the North Quarry in coming months.
Those results will be included in monthly reports due April 20 and June 20.
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LEGEND
~
= Well Location
Carbon Monoxide (ppm)
< 1,000
•
•
•
•
•
1,001
2,001
3,001
4,001
< 2,000
< 3,000
< 4,000
< 5,000
> 5,000
NOTES:
Carbon Monoxide represents
the laboratory reported
concentration for samples
collected during the month.
Carbon Monoxide Data Map- January 2014- Bridgeton Landfill
SCS ENGINEERS
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