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*'''Dry mass measurement'''. This method involves weighing the total (wet) mass of street sweepings and collecting samples for calculating the dry mass as a percent of total (wet) mass. The dry mass represents total solids collected. To calculate total phosphorus, dry mass is multiplied by a conversion factor. | *'''Dry mass measurement'''. This method involves weighing the total (wet) mass of street sweepings and collecting samples for calculating the dry mass as a percent of total (wet) mass. The dry mass represents total solids collected. To calculate total phosphorus, dry mass is multiplied by a conversion factor. | ||
*'''Wet mass measurement'''. This method involves weighing the total (wet) mass of street sweepings and multiplying by conversion factors to calculate total solids or total phosphorus. | *'''Wet mass measurement'''. This method involves weighing the total (wet) mass of street sweepings and multiplying by conversion factors to calculate total solids or total phosphorus. |
These methods are approved for calculating pollutant reductions. Guidance for calculating pollutant reduction is contained in this manual.
The following methods may be acceptable if appropriate protocol are followed. This manual does not provide guidance for applying these methods. Pollutant reductions calculated with these methods must be approved by the MPCA if used for permit compliance.
Empirical methods. Empirical methods other than those summarized in Survey of street sweeping crediting approaches may be acceptable. MPCA must be contacted for permit compliance.