Agenda - Council - 09/25/1990 - Laserfiche WebLink

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I I I I I I I I I I I I I I I I I The absence of till at B-129 also provides an additional migration pathway for dense contaminants with specific gravities that are greater than water. These "sinkers" tend to follow topographic lows in the aquifers and would therefore pass directly through the outwash sands and be in contact with the bedrock. The ability to monitor the site would be directly proportional to the ability to completely identify the holes in the till aqu_i~rO_as shown by B-112 and B-129. Resistivity data also indicated that other areas of the till may not be continuous as well. These results do not seem to be reflected on the cross-sections. 2.5. REVIEW SUMMARY As previously mentioned, the overall geology/hydrogeology data and methodologies appear to be thorough and accurate. The Scoping Document requirements are basically satisfied with the exception of groundwater quality. This area was basically left untouched. It was loosely alluded to and was mentioned in passing only. Some references were made to discussion of water quality elsewhere in the report but was never addressed. The other areas of concern included aquifer usage estimations, aquitard effectiveness, groundwater monitoring abilities and the reality of remediation efforts. While some differences in data interpretation are expected to occur, these areas of concern surpass interpretational differences and should be more completely explored. 2.6. REVIEW QUESTIONS Site P What are the plans for the waste material from the Anoka Regional Sanitary Landfill (ARSL) that has been deposited within the Site P boundaries? How will the water quality data from December 1988 to the present affect the extent the contamination as shown in Figure P.B. 27. 14