Section 144-232-7-701.0 - DETERMINING WHEN TO ABANDON WELLS701.1Contaminated wells: A well subject to defilation by either chemical or microbial contaminants which may not be adequately remediated, and whose source of contamination neither identified or removed, and which is determined by the commission to constitute a significant threat to public health or to contamination of the groundwater below, shall be abandoned.701.2Improperly installed wells: A water or geothermal heat exchange well determined by the commission to have been installed in violation of any part of these rules which can not be altered or repaired in a manner that will result in compliance with these rules including adequate set back from potential sources of contamination shall be abandoned.701.3Open boreholes: Any open borehole that is not properly cased, including the annular space being properly backfilled and the casing secured by a well cap or cover adequate to prevent access to the borehole, shall be abandoned.10-144 C.M.R. ch. 232, § 7-701.0