Mich. Admin. Code R. 325.11507 - Retention of records; filterbackwash

Rule 1507. A subpart H supply that employs conventional filtration or direct filtration treatment and that recycles spent filter backwash water, thickener supernatant, or liquids from dewatering processes shall collect and retain on file all of the following recycle flow information for review and evaluation by the department:

(a) Copy of the recycle notification and information submitted to the department under 40 CFR §141.76 (b), (2008), which is adopted by reference. The adopted material is contained in Title 40 CFR parts 136 to 149 which is available for purchase for $64.00 at the time of adoption of these rules from the superintendent of documents at the address in R 325.10116 (b). The adopted material is available for inspection and a copy is available at no cost from the offices of the department at the address in R 325.10116 (a).

(b) A list of all recycle flows and the frequency with which they are returned.

(c) The average and maximum backwash flow rate through the filters and the average and maximum duration of the filter backwash process in minutes.

(d) The typical filter run length and a written summary of how filter run length is determined.

(e) The type of treatment provided for the recycle flow.

(f) Data on the physical dimensions of the equalization or treatment units, or both, typical and maximum hydraulic loading rates, type of treatment chemicals used and average dose and frequency of use, and frequency at which solids are removed, if applicable.

Notes

Mich. Admin. Code R. 325.11507

2009 AACS