Borehole and well locations

1. Prior to the initiation of assessment activities in response to a contaminant release or when prior departmental approval is required, under existing state statute boreholes and monitoring wells must be installed at practicable locations based on plans and specifications approved by the department. 2. The riser of a monitoring well must terminate at least one foot [0.304 meter] above the ground surface, except: a. Monitoring wells should not be located in drainage ditches, floodplains, or floodway. Where this is impractical, the monitoring well should terminate at least two feet [0.609 meter] above the one hundred-year flood elevation for the well site. Those risers that do not must be constructed to preclude flood impact to the monitoring well. b. A riser for a well constructed in a high-traffic area or other limiting site conditions should be mounted flush to grade or below grade with a protective casing to minimize damage, provided that construction must include a watertight seal to preclude surface water from entering the protective casing or riser and that the well is clearly marked as a monitoring well.