Monitoring of bedrock-till interface is inadequate. A fracture map is needed. GPR? I think there are frost heave polygons in the area, Clermont County, Ohio, but they are very vague.
Has anyone tried to actually map cracks in "cracked till" that has vague polygonal features and figure out if they were significant?
This publication from Poland shows it was done for young frost polygons but for 300,000 year old tills overprinted by periglacial events, what might I see. I figure cracking related to polygon formation might show sand boils but will it show dessication? Has anyone tried to track piping tunnels at the bedrock till interface? I hit two 3 1/2 ft voids at -100 ft in drilling that are probably "soffusion" pipes. GPR and SP resistivity seem likely. It is, unfortunately a stretch for me to call for such work around a landfill without "cause". I think it is reasonable to claim it is routine baseline work but without other case histories, I have little to call upon but my own expertise.
Presumably they are mainly vertical, in which case you could try refraction seismic. Use a drop weight or hammer and plate and move an array of receiver stations around. Compare cavity wall sound insulation. I did something similar on a limestone quarry top that was cut by small faults; I can scan the resulting map for you if you wish.
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