R 560.423 Proposals to lower high groundwater elevation.

Rule 423. (1) The department may approve the use of a proposal that includes surface and subsurface drainage systems to control high groundwater elevation conditions for a development site that is less than 1 acre in size or subdivision. (2) Before approval, the owner or his designated representative shall install drainage systems specified in subrule (1) of this rule and shall monitor high groundwater elevations during the normally wettest time period of the year and at least from March 1 to June 1. Any of the following persons shall provide monitoring results to the department: (a) A licensed professional engineer. (b) A professional surveyor. (c) A registered sanitarian. (d) A certified professional geologist. (e) A certified professional soil scientist. (f) A professional approved by the department. In addition, the designated person shall substantiate that high groundwater elevation has been lowered to meet the requirement of R 560.421. (3) The designated person shall monitor high groundwater elevations by placing a monitoring well at representative locations approved by the department. The designated person shall make observations on the first day of the monitoring period and at least once every 7 days thereafter until the monitoring period is complete. (4) The designated person shall provide representative precipitation data for the time period of September 1 to May 31 and shall supply the data as part of the observations required in subrule (3) of this rule. Results of high groundwater elevation monitoring are inconclusive if recorded precipitation totals are less than 90% of normal averages during the time period of September 1 to May 31. (5) For a proposal to lower high groundwater elevation to be approved by the department, a county drain commissioner or other responsible governmental agency shall have approved the drain design and a responsible governmental agency shall have accepted responsibility for perpetual maintenance of the drain.