5 Colo. Code Regs. § 1003-2-100.9
Current through Register Vol. 47, No. 11, June 10, 2024
Section 5 CCR 1003-2-100.9 - WASTEWATER COLLECTION SYSTEM CLASSIFICATION100.9.1 Wastewater collection systems shall be classified in accordance with the following four classes: Class 1, Class 2, Class 3 or Class 4. Class 4 is the highest level of classification and Class 1 is the lowest level of classification. The Division may make changes in classification in accordance with the needs created by particular complexities of any specific wastewater collection system based on consideration of population, system complexities, or other facility specific factors, including, but not limited to, unusual factors, potential for mixing of sources, or potential health hazards.100.9.2 Criteria for Wastewater Collection System Classes 1, 2, 3, and 4 The Division will utilize a two-step process for classifying wastewater collection systems as follows:
Step 1: The first step will be to classify based on population served which is a surrogate for number of connections, system volume/flow, and pipe size/quantity. Increasing number of connections, volume, and flow implies increased complexity.
Step 1 Collection Table
CLASS | POPULATION SERVED1 |
Class 1 | 3,300 or Less |
Class 2 | 3,301 - 25,000 |
Class 3 | 25,001 - 100,000 |
Class 4 | Over 100,000 |
Note: 1. "Population served" means the average daily population that occurs during the busiest month of the year or normal operating period(s) including resident, non-transient, and transient population.
Step 2: The second step will be to account for additional system complexity not captured in step 1. The Division will increase the classification in accordance with the needs created by particular complexities of any specific wastewater collection system based on system specific factors as outlined in the Step 2 Collection Table below. Note: A system classified as a class 3 or class 4 based on population would not increase classification based on the Step 2 Collection Table. However, a class 1 or class 2 collection system will be increased to a class 2 or class 3 based on a listed complexity. System classifications can never be lower than the classification determined in step 1.
Step 2 Collection Table
Collection System Feature | Minimum Classification |
Lift stations1: designed capacity to receive greater than 2,000 gpd (domestic wastewater treatment works) and firm capacity2 less than 150,000 gpd (0.15 MGD). Includes 1 or 2 lift stations with one or both having firm capacity 150,000 gpd (0.15 MGD) or greater, but less than 0.35 MGD. | Class 1 |
Lift stations: 3 to 5, each with designed capacity to receive greater than 2,000 gpd (domestic wastewater treatment works) and one or more with firm capacity 150,000 gpd (0.15 MGD) or greater. | Class 2 |
Lift stations: 6 or more, each with designed capacity to receive greater than 2,000 gpd (domestic wastewater treatment works) and one or more with firm capacity 150,000 gpd (0.15 MGD) or greater. | Class 3 |
Lift station: any single lift station with firm capacity 0.35 MGD to 2.49 MGD. | Class 2 |
Lift station: any single lift station with firm capacity 2.5 MGD or more. | Class 3 |
Two significant industrial users (SIU)3 in collection system service area | Class 2 |
Three or more significant industrial users (SIU) in collection system service area | Class 3 |
Notes:
1. Lift stations for these evaluations do not include units with designed capacity to receive 2,000 gpd or less such as individual grinder pumps at residences or businesses. Lift stations for these evaluations do not include lift stations within the property of the owner of the domestic wastewater treatment facility as they are excluded from the definition of wastewater collection system.2. Firm capacity is installed pumping capacity with largest unit out of service.3. Significant industrial users are defined in section 100.2.100.9.3 The classification of any wastewater collection system may be changed at the discretion of the Division based on changes in any condition or circumstance since the last classification determination.100.9.4 Wastewater collection systems for a campus with multiple buildings (e.g., business, educational, camps, mobile home parks) with one owner of the campus property and any of the following conditions are to be classified and expected to operate under the supervision of a certified operator in responsible charge in accordance with this regulation:(a) Size exceeding 10,000 feet collection system pipe.(b) Having a lift station with a designed capacity to receive greater than 2,000 gpd (domestic wastewater treatment works) located on the property and discharging to another collection and/or treatment system beyond the property of the owner, unless legal arrangements are made with the receiving collection and/or treatment system to maintain the lift station.37 CR 18, September 25, 2014, effective 10/30/201438 CR 14, July 25, 2015, effective 8/30/201539 CR 01, January 10, 2016, effective 1/30/201639 CR 24, December 25, 2016, effective 1/30/201740 CR 14, July 25, 2017, effective 8/31/201741 CR 20, October 25, 2018, effective 3/1/201941 CR 24, December 25, 2018, effective 3/1/201942 CR 24, December 25, 2019, effective 1/14/202043 CR 21, November 10, 2020, effective 11/30/202044 CR 05, March 10, 2021, effective 3/31/202144 CR 09, May 10, 2021, effective 5/30/202144 CR 20, October 25, 2021, effective 11/30/2021