Section R. 323.2412 - Frequency of monitoringRule 2412.
(1) A person shall comply with the frequency of monitoring for all of the following as specified in table 7:(a) Total nitrogen (TN) or total Kjeldahl nitrogen (TKN).(b) Ammonium nitrogen (NH4-N).(c) Nitrate nitrogen (NO3-N).(d) Total phosphorus (P).(o) Zinc. The pathogen density requirements in R 323.2414(2)(a) and in R 323.2414(3)(c).
(q) The vector attraction reduction requirements in R 323.2415(4)(a) through (d) and R 323.2415(4)(f) through (h).(2) Table 7 reads as follows: TABLE 7 -- Frequency of Monitoring - Land Application Amount of Biosolids Produced (per 365-day period)
| English Dry Tons | Metric Dry Tons | Frequency |
| Greater than zero, But less than 320 | Greater than zero, but less than 290 | Once per year |
| Equal to or greater than 320, but Less than 1,650 | Equal to or greater than 290, but less than 1,500 | Once per quarter (4 times per year) |
| Equal to or greater than than 1,650, but Less than 16,500 | Equal to or greater than 1,500, but less than 15,000 | Once per 60 days (6 times per) |
| Equal to or greater than 16,500 | Equal to or greater than 15,000 | Once per month (12 times per year) |
(3) After the biosolids have been monitored for 2 years at the frequency in table 7 of this rule, the permitting authority may reduce the frequency of monitoring for pollutant concentrations and for the pathogen density requirements in R 323.2414(2)(e)(ii) and (iii), but the frequency of monitoring shall be not less than once per year when biosolids are applied to the land.(4) If biosolids are accumulated before removal, the monitoring frequency, at a minimum, is that specified in this rule. If monitoring of biosolids or a derivative indicates a pollutant concentration in excess of that provided in table 3 of R 323.2409(5)(c), then the monitoring frequency shall be increased to not less than twice that provided for in table 7 until pollutant concentrations are at or below the concentrations provided in table 3 of R 323.2409(5)(c). In the case of biosolids accumulating for periods of more than 1 year, biosolids must be monitored at the frequency determined in table 7 only in the year the biosolids are used. For a generator who removes biosolids monthly or more frequently, monitoring is required at least once per month each month that the biosolids are removed, unless more frequent monitoring is required in subrule(1) of this rule.Mich. Admin. Code R. 323.2412