In mid-October, the Illinois Joint Committee on Legislative Rules approved a regulation proposed by the state Department of Public Health that mandates a 50-ft. setback for vertical geothermal closed-loop boreholes from sewer lines. “Though the ruling allows for variances from the setback,” said Geothermal Exchange Organization (GEO) President Doug Dougherty, “they cost drillers and geothermal loop field installers time and
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