R 299.4442 Type II landfill groundwater monitoring; response action plan.

Rule 442. (1) The owner and operator of a type II landfill unit that is required to prepare a response action plan shall identify all of the following: (a) Possible sources of contamination. (b) Interim response activities taken or to be taken to control possible sources of contamination. (c) For units that the owner or operator concludes are probable sources of contamination, a schedule for terminating waste receipt, for initiating closure at units, and for redesigning and constructing new units that have leak detection systems. The schedule shall be based on all of the following: (i) The concentration of hazardous substances. (ii) The rate of migration. (iii) Risks to human health and the environment, including the proximity of drinking water supplies. (iv) The practicality of initiating closure. (v) The availability of other disposal locations. (vi) Other relevant factors. (2) The director shall approve or deny a response action plan within 60 days of submittal. If the director denies a plan, the director shall specify schedules for closure and interim response necessary to protect human health and the environment. (3) If the concentrations of all hazardous substances are shown to be at or below background values, using the statistical procedures in R 299.4908, for 2 consecutive sampling events, the owner and operator shall notify the director of this finding and may suspend actions under the response action plan.