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-18- <br />75, Prefer soil and aquifer conditions that offer natural protection over that <br />designed into the facility was the 4th optional criterion for chemical treat- <br />ment and transfer/storage facilities and the 3rd optional criterion for incin- <br />eration. <br />76. Both the Minnesota Pollution Control Agency (MPCA) and the Minnesota Geolo- <br />gical Survey (MGS) advised the Board that soil conditions are not critical for <br />hazardous waste processing facilities due to the requirements for full contain- <br />ment of materials on site. The MPCA stated that while heavy textured subsoils <br />are preferred due to the impermeable nature of such soils, other soils should <br />not be automatically considered unsuitable. The MGS noted that contact between <br />the soil and hazardous materials would occur only if and when the man-made con- <br />tainment structure failed and this contact would only exist until clean-up <br />procedures were complete. <br />77. Statutory requirement -- This criterion addresses the statutory require- <br />ment for protection of natural resources. <br />V. APPLICATION OF CRITERIA <br />78. The Waste Management Board hired Damon Farber and Associates and E.A. <br />Hickock and Associates to gather the data needed to apply this criteria to <br />the 7-county Metropolitan Area. <br />79. A letter requesting current land use plans, zoning maps and existing land <br />use maps was mailed to communities within the Metropolitan Area. <br />