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August 1999 <br />TABLE 2 <br />DESCRIPTORS USED IN QUALITATIVE HAZARD ASSESSMENT <br />Subsidence <br />Negligible <br />Very Low <br />Low <br />Medium <br />High <br />Groundwater Contamination <br />Negligible <br />Very Low <br />Low <br />Medium <br />High <br />Surface: movement detectable with precision <br />survey, no damage. <br />Subsurface: casing, cement, wellbore damage <br />within 100 ft of Dissolution Surface. <br />Surface: detectable visible topographic effects <br />Subsurface: casing, cement, wellbore damage <br />up to the Dissolution Surface. <br />Surface: highly visible topographic effects. <br />Subsurface: casing, cement, wellbore damage <br />to 100 ft above the Dissolution Surface. <br />Surface: major topographic effects and <br />drainage impact. <br />Subsurface: casing, cement, wellbore damage <br />within 100 ft of B Groove. <br />Surface: hazardous topographic effects. <br />Subsurface: casing, cement, wellbore damage <br />up to and including the B Groove <br />Statistical water quality change detected in a <br />process monitoring well. <br />> 25% increase in TDS over background <br />detected in the B Groove aquifer in a process <br />monitoring well. <br />> 25% increase in TDS over background <br />detected in the B Groove aquifer in a <br />compliance monitoring well <br />> 100% increase in TDS over background <br />detected in the B Groove aquifer in a <br />compliance monitoring well <br />> 200% increase in TDS over background <br />detected in the B Groove aquifer in a <br />compliance monitoring well <br />Page 1 of 2 <br />\ \GAL DEN1 \PROJECTS \WP \99 \2057\2057T2.DOC Golder Associates <br />993 -2057 <br />