R 299.4450 Type II landfill monitoring; primary inorganic indicators.

Rule 450. (1) All of the following constituents are primary inorganic indicators for purposes of monitoring type II landfills under this part, unless alternate inorganic indicators are approved under subrule (3) of this rule: (a) Chlorides. (b) Iron. (c) Sulfates. (d) Total inorganic nitrogen. (e) Total dissolved solids. (2) To be considered a primary inorganic indicator, both of the following conditions shall be met: (a) The concentration of the constituent in leachate shall be high enough to ensure detection at the solid waste boundary in the event of a release from the unit. (b) An appropriate statistical method that meets the requirements of R 299.4908 is available to ensure early detection in the event of a release from the unit. (3) An owner and operator may, at their discretion, propose 1 or more constituents from R 299.4451 to replace 1 or more indicators listed in subrule (1) of this rule. The director shall approve the use of alternate indicators if the owner and operator demonstrate that the conditions of subrule (2) of this rule are met and the proposed alternates will detect leakage from the unit at least as effectively. (4) The constituents listed in this rule shall be analyzed in accordance with methods contained in the publication entitled "Standard Methods for the Examination of Water and Wastewater, 19th edition," which is adopted by reference in R 299.4139 or by other methods approved by the director or his or her designee.