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zone” just above bedrock to reach a drainageway. (The report notes that the fracture flow system was not modeled because effluent would move at a much slower rate through bedrock fractures and “only the quickest times of travel are of interest.”)
For a “worst case,” using higher than likely parameters for transmissivity and permeability, the effluent moved in the same direction but at a faster rate, reaching the nearby creek from source point three in less than 10 years.
Mr. McCarthy pointed out that both probable and “worst case” scenarios are based not on the synthetic landfill liner springing a leak but rather there being no liner at all. In addition, the modeling assumes that the soil has reached 100 percent of its absorption power,
“Basically, what the modeling shows is that if the leachate containment system fails, the monitoring wells are located on-site to intercept any pollution plume before it leaves the fill area,” Mr. Joyce explained. With samples taken quarterly from the monitoring wells, contaminants would be detected early and action to contain the pollution could be taken, the engineer said.
Ascertaining that no testing has been done beyond what was completed for the geotechnical evaluation of the proposed landfill site, Jackson District Supervisor ElSee
LANDFILL, p. 17
77.3%