A preliminary groundwater evaluation must be conducted for all proposed MSTS according to this part.
The following information must be ascertained from the best available information:
The designer must consult with the local unit of government to determine whether the local unit of government will require a field or further groundwater investigation and, if so, the extent of the investigation. The field or further investigation must be conducted if information gained in subpart 2 indicates that a proposed system is a potential contaminant threat to a regional water table, an aquifer, or water supply well(s). The threats of concern include, but are not limited to, fecal organism contamination, nitrate contamination, or phosphorus impacts to surface waters.
The designer must consult with the local unit of government to determine if the local unit of government will require effluent or groundwater monitoring and, if so, the extent of the monitoring. Monitoring must be conducted if information gained in subpart 2 or 3 indicates that a proposed system is a potential contaminant threat to a regional water table, an aquifer, or a water supply well or impacts surface waters. The potential groundwater mound height must be monitored under all MSTS during operation.
The information gathered in this part must be used to estimate or measure if the system adequately protects the groundwater and surface water as prescribed in part 7081.0080, subpart 4. The interpretation must include an evaluation of whether contaminant plumes will intersect water supply well capture zones.
All information required in this part must be submitted for review and approval of the local unit of government prior to final design, including all applicable information delineated on a map.
Minn. R. Part 7081.0210
Statutory Authority: MS s 115.03; 115.55