Code of Colorado Regulations
1000 - Department of Public Health and Environment
1002 - Water Quality Control Commission (1002 Series)
5 CCR 1002-74 - REGULATION NO. 74 - BEAR CREEK WATERSHED CONTROL REGULATION
Section 5 CCR 1002-74.4 - DETERMINATIONS OF WASTELOAD

Universal Citation: 5 CO Code Regs 1002-74 ยง 4

Current through Register Vol. 47, No. 5, March 10, 2024

For municipal, domestic and industrial dischargers, the monthly and annual wasteloads shall be determined as follows:

1. For each direct discharge and for each discharge to land disposal and land treatment, monthly phosphorus loads (pounds) contributed shall be determined based upon the following formula:

Monthly Phosphorus Load (Pounds) = Monthly volume discharged (million gallons) x average of all individual concentration values for that month (mg/l) x 8.34

(1) For dischargers utilizing land treatment, the monthly volume shall be calculated by the following formula:

Monthly Volume Discharged (Million Gallons)(MG) = Volume in all lysimeters (gallons) x Area of land application site (square feet) / Total Area of all lysimeters (square feet) (1,000,000 gal/mg)

(2) For all dischargers using land disposal and for direct dischargers, the monthly volume shall be the sum of all total volumes of effluent measured at each outfall.

2. The annual phosphorus wasteload shall be the sum of the 12 monthly phosphorus loads calculated for that calendar year for all discharge points and sites and shall not exceed the wasteload allocations, set forth in section 74.3.1.

3. Phosphorus concentrations for each direct discharge and land disposal site will be calculated by the following formula:

Phosphorus Concentration (mg/l) = the sum of the total phosphorus concentrations of all samples (mg/l) for the month / the number of samples collected.

4. For land treatment discharges a flow-weighted phosphorus concentration shall be determined by using the formula in 3 above and the following formula:

Flow-Weighted Phosphorus Concentration (mg/l) = sum of the products of phosphorus concentrations and monthly volumes for each lysimeter / the sum of all monthly volumes for all lysimeters.

Monthly Average Phosphorus Concentration = the sum of all concentration values for a lysimeter for the month / the number of concentration values for that lysimeter.

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