HomeMy WebLinkAbout921291.tiff STATE? OF-COLORADO
ti:•cote,COLORADO DEPARTMENT OF HEALTH
Dedicated to protecting and improving the health and -
environment of the people of Colorado • ��,Gail i •.
4300 Cherry Creek Dr.S. Laboratory Building CH F: - *1876•
Denver,Colorado 80222-1530 4210 E.11th Avenue -
Phone(303)692-2000 Denver,Colorado 802 20-3 71 6
(303)691-4700 Roy Romer
Governor
Patricia A.Nolan,MD,MPH
Executive Director
November 23, 1992
Alan Scheere
BSI Hedberg
Waste Management of North America, Inc.
5660 Greenwood Plaza Blvd., Suite 424
Englewood, Colorado 80111
RE: Landfill Gas Monitoring Plan
Central Weld Sanitary Landfill
Weld County
Dear Mr. Scheere and Mr Hedberg:
The Hazardous Materials and Waste Management Division (the Division) of the Colorado Department of
Health has completed the review of the "Landfill Gas Monitoring Plan for Central Weld Sanitary Landfill"
located in Weld County. The review is made under the authority of the "Solid Waste Disposal Sites and
Facilities Act," Title 30, Article 20, Part 1 of the Colorado Revised Statues, as amended (the Statute), and
the"Regulations Pertaining to Solid Waste Disposal Sites and Facilities." The Regulations were adopted for
the implementation of the Statute and are contained in the Colorado Code of Regulations, 6 CCR 1007-2
(the Regulations). The intent of the document was to provide the plan for monitoring explosive gases at the
site boundary and facility structures.
The Division has the following comments regarding the report and about the site in general.
1. The Division requests that the landfill gas monitoring be performed quarterly, rather than on a semi-
annual basis as indicated in the report. At least in a few areas of the landfill, the wastes are
saturated, therefore the Division believes that more frequent monitoring is necessary.
2. The November 6, 1992 submittal of landfill gas monitoring has shown several perimeter gas probes
(SG1, SG2, and SG20)top have exceeded the regulatory requirement of 5% by volume in air at the
site boundary. Page 10 of the landfill gas monitoring plan states that if the regulatory levels are
exceeded, appropriate evaluations and actions will be taken. Please specify what evaluations and
actions will be taken, in light of the elevated landfill gas concentrations.
3. In order to evaluate if the landfill soil gas probes are installed to the proper depths, please provide
cross-sections that show the depth of the waste with respect to the total depth of the soil gas
probes.
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Alan Scheere and Bill Hedberg
Central Weld Sanitary Landfill
November 23, 1992
Page 2/2
Please respond in writing to the issues detailed above. Either Roger Doak or Austin Buckingham may be
contacted at this office, if you have any questions.
Sincerely,
C /
A
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Austin N. Buckingham Roger Doak
Geologist Geologist
Hazardous Materials and Hazardous Materials and
Waste Management Division Waste Management Division
cc: J. Pickle, Weld County Health Department
A. Scheere, Waste Management of North America
L. Tagawa, Waste Management of North America
Weld County Department of Planning
"Weld County Commissioners
G. Mallory, CDH/HMWMD
P. Harley, CDH/HWMWD
file: SW/WLD/CEN correspondence
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