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I <br />I <br />I <br />! <br />I <br />I <br />I <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I .~~ <br /> <br />The HRS values are calculated by assigning three scores to a facility based on potential <br />for: migration, fire/explosion and direct contact with migration potential generally being <br />the dominant-factor. The HRS procedural ranking includes the hazardous mater/al <br />containment, reIease route(s), characteristics and amounts of hazardous material and the <br />potential targets. Although the probability and magnitude of harm is not quantified by <br />the HRS ranking, these factors are includ~d-h~ the calculations. The I~.S scores on the <br />Minnesota Permanent List of Prior/ties range from 1 to 66. These four sites, by <br />comparison generally exh~it relatively elevated HRS values. The presence of these <br />known hazardous waste disposal sites immediately adjacent to or nearby the three <br />proposed solid waste disposal sites D, P and Q greatly complicate the groundwater <br />monitoring programs required so as to be able to differentiate groundwater impact <br />sources between existing contamination and potential impacts fi.om a new disposal <br />facility. Locating proposed sites near known sources of continuing groundwater <br />contamination also raises the issue of potentially compounding existing groundwater <br />contamination. <br /> <br />25 <br /> <br /> <br />