Indiana Administrative Code
Title 327 - WATER POLLUTION CONTROL DIVISION
Article 5 - INDUSTRIAL WASTEWATER PRETREATMENT PROGRAMS AND NPDES
Rule 3.5 - Streamlined Mercury Variance Requirements and Application Process
Section 3.5-8 - SMV interim discharge limit
Current through September 18, 2024
Authority: IC 13-13-5-1; IC 13-13-5-2; IC 13-14-8; IC 13-14-9; IC 13-15-1-2; IC 13-15-2-1; IC 13-18
Affected: IC 13-18-4
Sec. 8.
(a) The interim limit for mercury discharge for the duration of an SMV shall be based on representative effluent data that have been analyzed using Analytical Method 1631 or any analytical method approved by the department. The interim limit shall be expressed as the highest daily value for mercury from a data set that includes a minimum of six (6) daily values that are generally evenly spaced over the most recent twelve (12) to twenty-four (24) month period and representative of the four (4) seasons. The highest daily value will become the value for the interim limit. Compliance with the interim limit is achieved if the average of the measured effluent daily values over the rolling twelve (12) month period is less than the interim limit. An SMV is not available to an applicant that requests an interim limit greater than thirty (30) ng/l (parts per trillion).
(b) The interim discharge limit shall be evaluated upon receipt of a renewal SMV application based upon available, valid, and representative data of the effluent levels for mercury collected and analyzed over the most recent two (2) year period. Data collection and analyses must be done according to Analytical Method 1631 or the analytical method approved by the department.
