5 Colo. Code Regs. § 1002-36.5
All waters of the Rio Grande 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 Appendix 36-1. 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 36-1.
See Basic Standards and Methodologies for Surface Water at 31.17 for a listing of chlorophyll a, total nitrogen, and total phosphorus standards for lakes and reservoirs (Table V) and rivers and streams (Table VI). As described in 31.17(2), total nitrogen and total phosphorus standards will be considered for adoption in phases.
Prior to December 31, 2027, total nitrogen and total phosphorus values will be considered for adoption only in the limited circumstances defined at 31.17(2)(a)(i), (ii), and (iii). For lakes and reservoirs, for both total nitrogen and total phosphorus, these circumstances include waterbodies upstream of certain domestic and non-domestic wastewater treatment facilities (31.17(2)(a)(i)(A)); in addition, for total phosphorus, other special circumstances as determined by the Commission (31.17(2)(a)(i)(B)). For rivers and streams, for total phosphorus only, these circumstances include waterbodies upstream of certain domestic and non-domestic wastewater treatment facilities (31.17(2)(a)(ii)(A)) and other special circumstances as determined by the Commission (31.17(2)(a)(ii)(B)). For lakes, reservoirs, rivers, and streams where total nitrogen and total phosphorus standards have not yet been adopted, 31.17(2)(a)(iii) allows the commission to adopt standards as needed in additional circumstances.
Pursuant to 31.17(2)(a)(i)(A) and 31.17(2)(a)(ii)(A), 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, cooling tower discharges, and any non-domestic facilities subject to Regulation 85 effluent limits and discharging prior to May 31, 2012 in the Rio Grande Basin:
Segment | Permittee | Facility name | Permit No. |
CORGRG02 | Mountain Views at Rivers Edge RV | Mtn Views At Rvrs Edge Rv Rst | COG588069 |
CORGRG04b | South Fork Water and Sanitation District | South Fork Water and San Dist WWTF | COG588039 |
CORGRG04c | Monte Vista City of | Veterans Center WWTF | CO0036927 |
CORGRG04c; CORGRG15 | Monte Vista City of | Henderson Lagoon Facility | CO0023132 |
CORGRG04b; CORGRG18 | Del Norte Town of | Del Norte WWTF | CO0020281 |
CORGRG07 | Creede City of | Creede WWTF | CO0040533 |
CORGRG09b | Fun Valley Resort | Fun Valley Resort | COG588018 |
CORGRG09a | Wolf Creek Ski Corp | Wolf Creek Ski Corp WWTF | CO0041785 |
CORGRG12 | Alamosa City of | Alamosa Regional WWTF | CO0044458 |
CORGRG15 | San Luis Water and Sanitation District | San Luis Water and San Dist WWTF | COG589082 |
CORGRG31 | Costilla County Water and Sanitation System | Costilla County Water & San Dist WWTF | CO0036528 |
CORGAL12 | La Jara Town of | La Jara WWTF | CO0020150 |
CORGAL15 | Manassa Town of | Manassa WWTF | CO0042935 |
CORGAL18 | Antonito Town of | Antonito WWTF | CO0040975 |
CORGCB06 | Baca Grande Water and Sanitation District | Aspen Institute | CO0046914 |
Prior to December 31, 2027:
* For segments located entirely above these facilities, total nitrogen and total phosphorus standards apply to the entire segment.
* For segments with portions downstream of these facilities, total nitrogen and total phosphorus standards only apply above these facilities. A note was added to the total phosphorus and total nitrogen standards in these segments. The note references the table of qualified facilities at 36.5(4).
* For segments located entirely below these facilities, total nitrogen and total phosphorus standards do not apply.
* Additionally, for segments with portions downstream of these facilities or for segments located entirely below these facilities, total phosphorus standards may apply where special circumstances have been identified by the Commission (31.17(2)(a)(i)(B) and 31.17(2)(a)(ii)(B)).
5 CCR 1002-36.5