329 IAC 10-29-1 Monitoring devices

Sec. 1. (a) All new restricted waste sites Type I and Type II and nonmunicipal solid waste landfills must have ground water monitoring devices. All existing nonmunicipal solid waste landfills in operation on the effective date of 329 IAC 2, which was repealed in 1996, that do not have ground water monitoring devices must install such devices on or before September 1, 1989. (b) The number and location of monitoring devices are as follows: (1) The following for new facilities: (A) The ground water monitoring system must consist of a sufficient number of monitoring devices, installed at appropriate locations and depths, to yield ground water samples from the aquifer or aquifers that represent the quality of both background water that has not been affected by leachate from a facility and the quality of ground water passing the monitoring boundary of the facility. If the aquifer to be monitored exceeds the depth specified in 329 IAC 10-24-3(1)(C), the commissioner may allow alternative placement of monitoring devices. (B) The number, spacing, and depths of monitoring devices must be proposed by the applicant in the site-specific geological study required under 329 IAC 10-24. (C) A minimum of four (4) ground water monitoring devices, one (1) upgradient and three (3) downgradient, must be installed. (2) For existing facilities under subsection (a), as follows: (A) A minimum of four (4) ground water monitoring devices, one (1) upgradient and three (3) downgradient, must be installed at facilities that do not have an existing ground water monitoring system that meets the requirements of the commissioner. (B) Locations and installation of monitoring devices must be in accordance with a plan submitted to and approved by the commissioner. (c) The commissioner may request notification in advance of the date and time of the installation of the monitoring devices. (d) The owner or operator of a restricted waste site Type I or Type II or nonmunicipal solid waste landfill shall prepare and submit to the commissioner at least annually a ground water flow map or maps as necessary to indicate seasonal ground water. If data acquired during operation of the facility indicates that ground water flow directions are other than as anticipated in the ground water monitoring system design, the commissioner may require additional ground water monitoring wells at the facility. (e) If for any reason a ground water monitoring well or other monitoring device is destroyed or otherwise fails to properly function, the owner or operator of a restricted waste site Type I or Type II or nonmunicipal solid waste landfill shall notify the commissioner within ten (10) days of discovery. The device must be repaired if possible. If the device cannot be repaired, it must be properly abandoned and replaced within sixty (60) days of the notification unless the owner or operator is notified otherwise in writing by the commissioner. (f) As used in this rule, "monitoring devices" includes the following: (1) Ground water monitoring wells. (2) Suction lysimeters. (3) Moisture probes. (4) Similar monitoring devices. (g) As used in this rule, "monitoring boundary of the facility" means the vertical plane provided by the monitoring devices hydraulically downgradient from the facility. The downgradient monitoring devices that constitute the monitoring boundary of the facility must be located within fifty (50) feet of the solid waste boundary or the property line, whichever is closer to the solid waste boundary, except where fifty (50) feet is not possible because of site topography or geology. In the case of existing facilities that have ground water monitoring devices approved by the commissioner prior to April 13, 1996, those approved devices must define the monitoring boundary of the facility.