Mich. Admin. Code R. 323.2417

Current through Vol. 24-18, October 15, 2024

Section R. 323.2417 - Procedure to determine annual whole biosolids application rate

Rule 2417.

(1) A person who applies biosolids to the land shall use the following formula to determine the loading rate:

Loading Rate Formula

AP = PC x 0.002 x AR

Where: AP = applied pollutant in pounds per acre.

PC = pollutant concentration in milligrams per kilogram dry weight.

0.002 = the factor to convert pollutant concentration to pounds per dry ton.

AR = the biosolids application rate in dry tons per acre.

(2) R 323.2409(4)(b) requires that the product of the concentration for each pollutant listed in table 4 of R 323.2409(5)(d) in biosolids sold or given away in a bag or other container for application to the land and the annual whole biosolids application rate (AWBAR) for the biosolids not cause the annual pollutant loading rate for the pollutant in table 4 to be exceeded. This rule contains the procedure used to determine the AWBAR for biosolids that do not cause the annual pollutant loading rates in table 4 to be exceeded. The relationship between the annual pollutant-loading rate (APLR) for a pollutant and the annual whole biosolids application rate (AWBAR) for a biosolids is shown in the following equation:

APLR = C x AWBAR X 0.001 equation (1)

Where: APLR = annual pollutant loading rate in kilograms per hectare per 365-day period.

C = pollutant concentration in milligrams per kilogram of total solids (dry weight basis).

AWBAR = annual whole biosolids application rate in metric tons per hectare per 365-day period (dry weight basis).

0.001 = a conversion factor.

(3) To determine the AWBAR, equation (1) is rearranged into the following equation:

AWBAR = APLR / C x 0.001 equation (2)

(4) The procedure used to determine the AWBAR for biosolids is as follows:

(a) Analyze a sample of the biosolids to determine the concentration for each of the pollutants in the biosolids listed in table 4 of R 323.2409(5)(d).

(b) Using the pollutant concentrations from subdivision (a) of this subrule and the APLRs from table 4 of R 323.2409(5)(d), calculate an AWBAR for each pollutant using equation (2) in subrule (3) of this rule.

(c) The AWBAR for the biosolids is the lowest AWBAR calculated in subdivision (b) of the subrule.

Mich. Admin. Code R. 323.2417

1999 AACS