5 Colo. Code Regs. § 1002-72.8

Current through Register Vol. 47, No. 11, June 10, 2024

Section 5 CCR 1002-72.8 - NUTRIENT MONITORING

1. Monitoring of wastewater facilities shall be consistent with the requirements of section 72.4.4 of this control regulation. Wastewater facilities shall monitor nutrient concentrations including, but not limited to, nitrate, nitrite, ammonia, total phosphorus, total soluble phosphorus and orthophosphate.

2. The Authority shall develop and implement, in conjunction with local governments, a routine annual water quality monitoring program of the Cherry Creek watershed and Cherry Creek Reservoir. The monitoring program shall include monitoring of the reservoir water quality and inflow volumes, alluvial water quality, and nonpoint source flows. Monitoring shall include, but not be limited to nitrate, nitrite, ammonia, total phosphorus, total soluble phosphorus, and orthophosphate concentrations.

(a) Routine monitoring of surface water, ground water, and the reservoir shall be implemented to determine the total annual flow-weighted concentration of nutrients to the reservoir.

(b) Monitoring of PRFs shall be implemented to determine inflow and outflow nutrient concentrations.

3. The Authority shall consult with the Division in the development of the monitoring program to ensure that the monitoring plan includes the collection of data to evaluate nutrient sources and transport, to characterize reductions in nutrient concentrations, and to determine attainment of water quality standards in Cherry Creek Reservoir.

4. The Authority shall consult with the Division and other appropriate entities in development of any water quality investigative special studies.

Special studies may include, but are not limited to, the following areas of investigation:

(a) Feasibility study of nutrient removal from point sources;

(b) Quantification of effectiveness of nonpoint source concentration-based phosphorus control strategies called PRFs; and

(c) Quantification of effectiveness of regulated stormwater concentration-based phosphorus control strategies called CMs; and

(d) Quantification of the effectiveness of source control CMs that include low-impact development techniques.

5. The monitoring data shall be used by the Authority to determine phosphorus fate and transport, calculate annual flow-weighted phosphorus concentrations, document compliance with the applicable water quality standards, analyze long-term trends in water quality for both the reservoir and the Cherry Creek watershed, and calibrate water quality models.

6. The Authority shall maintain all data collected pursuant to this section in an electronic database for evaluation and transfer to the Division and other entities.

5 CCR 1002-72.8

45 CR 11, June 10, 2022, effective 6/30/2022