POLLUTANT LIMITS

Subpart 1. Ceiling concentrations. Bulk sewage sludge or sewage sludge sold or given away in a bag or other container must not be applied to the land if the concentration of any pollutant in the sewage sludge exceeds the ceiling concentration for the pollutant in subpart 4, item A. Subp. 2. Cumulative loading rates. If bulk sewage sludge is applied to agricultural land, forest, a public contact site, or a reclamation site, either the cumulative loading rate for each pollutant must not exceed the cumulative pollutant loading rate for each pollutant in subpart 4, item B, or the bulk sewage sludge must be exceptional quality sewage sludge. Subp. 3. Pollutant concentrations. The conditions in items A and B apply to pollutant concentrations in bulk sewage sludge and sewage sludge sold or given away in a bag or other container. A. If bulk sewage sludge is applied to a lawn or a home garden, the concentration of each pollutant in the sewage sludge must not exceed the concentration for the pollutant in subpart 4, item C. B. If sewage sludge is sold or given away in a bag or other container for application to the land, either: (1) the concentration of each pollutant in the sewage sludge must not exceed the concentration for the pollutant in subpart 4, item C; or (2) the product of the concentration of each pollutant in the sewage sludge and the annual whole sludge application rate for the sewage sludge must not cause the annual pollutant loading rate for the pollutant in subpart 4, item D, to be exceeded. The procedure used to determine the annual whole sludge application rate is outlined in part 7041.3100 . Subp. 4. Pollutant concentrations and loading rates. Pollutant concentrations and loading rates are given in items A to D. A. Ceiling concentrations. Pollutant Ceiling Concentration (mg/kg) 1 Arsenic 75 Cadmium 85 Copper 4300 Lead 840 Mercury 57 Molybdenum 75 Nickel 420 Selenium 100 Zinc 7500 1 Dry weight basis B. Cumulative pollutant loading rates. Pollutant Rate (kg/ha) Rate (lbs/ac) Arsenic 41 37 Cadmium 39 35 Copper 1500 1339 Lead 300 268 Mercury 17 15 Nickel 420 375 Selenium 100 89 Zinc 2800 2500 C. Pollutant concentrations. Pollutant Monthly Average Concentrations (mg/kg) 1 Arsenic 41 Cadmium 39 Copper 1500 Lead 300 Mercury 17 Nickel 420 Selenium 100 Zinc 2800 1 On a dry weight basis, the arithmetic mean of all measurements taken during the month. D. Annual pollutant loading rates per 365-day period. Pollutant Rate (kg/ha) Rate (lb/ac) Arsenic 2.0 1.8 Cadmium 1.9 1.7 Copper 75.0 67.0 Lead 15.0 13.0 Mercury 0.85 0.76 Nickel 21.0 19.0 Selenium 5.0 4.5 Zinc 140.0 125.0