5 Colo. Code Regs. § 1002-34.5
All waters of the San Juan/Dolores River Basin are subject to the following standard for temperature. (Discharges regulated by permits, which are within the permit limitations, shall not be subject to enforcement proceedings under this standard). Temperature shall maintain a normal pattern of diurnal and seasonal fluctuations with no abrupt changes and shall have no increase in temperature of a magnitude, rate, and duration deemed deleterious to the resident aquatic life. This standard shall not be interpreted or applied in a manner inconsistent with section 25-8-104, C.R.S.
See Basic Standards and Methodologies for Surface Water for a listing of organic standards at 31.11 Table B and metal standards found at 31.16 Table III. The column in the tables headed "Water + Fish" are presumptively applied to all aquatic life class 1 streams which also have a water supply classification, and are applied to aquatic life class 2 streams which also have a water supply classification, on a case-by-case basis as shown in the Appendix 34-1. The column in the tables at 31.11 and 31.16 Table III headed "Fish Ingestion" is presumptively applied to all aquatic life class 1 streams which do not have a water supply classification, and are applied to aquatic life class 2 streams which do not have a water supply classification, on a case-by-case basis as shown in Appendix 34-1.
Some of the waterbodies in the San Juan/Dolores River Basin cross boundaries of Indian Reservations of the Southern Ute and Ute Mountain Ute Tribes. The Commission has included water quality classifications and standards on lands within the boundaries of these reservations in order to avoid a gap in the classifications and standards adopted for the river basins in question. EPA has granted the Southern Ute and Ute Mountain Ute Indian tribes' applications for treatment as a state with respect to adoption of water quality standards. The Commission intends that the classifications and standards that it is adopting apply to the lands in question only to the extent that the state has jurisdiction and is not attempting to resolve that jurisdictional issue here. Segments within Reservation boundaries are noted in the segment description and Appendix 34-1 tables.
Prior to May 31, 2022, interim nutrient values will be considered for adoption only in the limited circumstances defined at 31.17(e). These circumstances include headwaters, Direct Use Water Supply (DUWS) Lakes and Reservoirs, and other special circumstances determined by the Commission. Additionally, prior to May 31, 2017, only total phosphorus and chlorophyll a will be considered for adoption. After May 31, 2017, total nitrogen will be considered for adoption per the circumstances outlined in 31.17(e).
Prior to May 31, 2022, nutrient criteria will be adopted for headwaters on a segment by segment basis for the San Juan River Basin. Moreover, pursuant to 31.17(e) nutrient standards will only be adopted for waters upstream of all permitted domestic wastewater treatment facilities discharging prior to May 31, 2012 or with preliminary effluent limits requested prior to May 31, 2012, and any non-domestic facilities subject to Regulation 85 effluent limits and discharging prior to May 31, 2012. The following is a list of all permitted domestic wastewater treatment facilities discharging prior to May 31, 2012 or with preliminary effluent limits requested prior to May 31, 2012, and any non-domestic facilities subject to Regulation 85 effluent limits and discharging prior to May 31, 2012 in the San Juan River Basin:
Segment | Permittee | Facility name | Permit No. |
COSJSJ05 | San Juan River Village Metro | San Juan River Village Metro WWTF | COG588013 |
COSJSJ06a | High Country Lodge LLC | High Country Lodge | COG588002 |
COSJSJ06b | Pagosa Springs Sanitation District | Pagosa Springs San District WWTF | CO0022845 |
COSJPI06d | Pagosa Area Water and San Dist | Vista WWTF | CO0031755 |
COSJPN02a | Bayfield Town of | Bayfield Town of | CO0048291 |
COSJPN02a | Five Branches Camper Park | Five Branches Camper Park | COG588054 |
COSJPN02a | Forest Lake Metro Dist | Forest Lakes Metro District | CO0048160 |
COSJPN02a | Pine River Camp LLC | Kanakuk Colorado Youth Camp | COG588059 |
COSJPN04 | Lipslea Enterprises LLC | Vallecito Resort | COG588026 |
COSJAF03b | Silverton Town of | Silverton Town of WWTF | CO0020311 |
COSJAF04b | Herrick Durango Land Co LLC | Durango North Ponderosa KOA | COG588020 |
COSJAF05a | Hermosa Sanitation District | Hermosa Sanitation District | COG588010 |
COSJAF05a | Durango City of | Durango City of | CO0024082 |
COSJAF05a | South Durango Sanitation District | South Durango SD WWTF | COG588057 |
COSJAF10a | Edgemont Ranch Metro Dist | Edgemont Ranch Metro District WWTF | CO0040266 |
COSJAF10b | Forest Groves Estates | Forest Groves Estates WWTP | COG588030 |
COSJAF11b | Durango La Plata County Airport | Durango/La Plata County Airport | CO0047457 |
COSJAF12a | Grizzly Peak Water Sales&Distribution LLC | Cascade Village WWTF | CO0039691 |
COSJAF12a | Purgatory Metropolitan District | Purgatory Metropolitan Dist | COG589010 |
COSJAF13c | Durango West Metro Dist #2 | Durango West Metro Dist #2 WWTF | COG589115 |
COSJAF13d | Narrow Gauge MHP | Narrow Gauge MHP | COG589077 |
COSJAF14b | MacArthur Apartments LLC | Lightner Creek Campground | CO0026468 |
COSJLP05 | Mancos Town of | Mancos Town of | CO0021687 |
COSJLP05 | Upper Valley Sanitation | Upper Valley Sanitation Dist. | CO0047147 |
COSJLP07a | Cortez Sanitation District | Southwest WWTF | CO0027545 |
COSJLP07a | Vista Verde Village LLC | Vista Verde Village | CO0037702 |
COSJLP08 | Elegant Hills Park and Estates LLC | Lakeside WWTF | COG589098 |
COSJLP09 | Lee Mobile Home Park | Lee Mobile Home Park | COG589070 |
COSJLP10 | Dove Creek Town of | Dove Creek WWTF | COG589079 |
COSJDO04a | Fort Beyhan LLC | Dolores River RV Park and Cabins | COG588071 |
COSJDO04a | Dolores Town of | Dolores WWTF | CO0040509 |
Prior to May 31, 2022:
* For segments located entirely above these facilities, nutrient standards apply to the entire segment.
* For segments with portions downstream of these facilities, nutrient standards only apply above these facilities. A note was added to the total phosphorus and chlorophyll a standards in these segments. The note references the table of qualified facilities at 34.5(5).
* For segments located entirely below these facilities, nutrient standards do not apply.
A note was added to the total phosphorus and chlorophyll a standards in lakes segments as nutrients standards apply only to lakes and reservoirs larger than 25 acres surface area.
5 CCR 1002-34.5