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OPTION #4: Construct an alternate buried gas collection system (as in Option #3) plus a landfill
gas purification system to remove the sulfur. The gas purification system is new technology not
used in this country yet. The only working model is in Australia. This technology claims to
remove 98% of the sulfur, in our case that would be in-the 500# per day range. 'The estimated
cost for the buried gas collection system and installation of the gas purification system is
estimated to be $1,000,000 plus $65,000 per year operating and maintenance costs. Waste
Management has had experience with other gas purification systems to remove sulfur at other
facilities. The experience is not good for they do not work as well as advertised with extremely
high operating and maintenance costs.
In analyzing this issue, other information is as follows:
A. As time passes, the gas production in this part of the landfill with high H2S will decrease
and this sulfur problem will greatly diminish. We do not know if this time frame is two
years or ten years.
B. If the landfill receives the necessary permits from the City of Elk River, Sherburne
County, and the MPCA to expand, another LFG to electric generation facility will be
proposed. We have previously presented the financial pro-forma for this proposed power
plant expansion to this Commission. There is enough revenue in the power plant
expansion to pay for Option #3 or #4 above. We will not know the future of the landfill
expansion for six to nine months.
I am leaning towards Option #3 but getting Sherburne County to participate financially may be
challenging. It will take approximately six months to do the necessary engineering to authorize
the construction documents. Another strategy is Option #1 for now and wait for the
determination of the landfill expansion.
Does the Commission have any other ideas or suggestions?
i .n• c