Code of Colorado Regulations
1000 - Department of Public Health and Environment
1002 - Water Quality Control Commission (1002 Series)
5 CCR 1002-93 - REGULATION NO. 93 - COLORADO'S SECTION 303(D) LIST OF IMPAIRED WATERS AND MONITORING AND EVALUATION LIST
Section 5 CCR 1002-93.17 - STATEMENT OF BASIS, SPECIFIC STATUTORY AUTHORITY AND PURPOSE; DECEMBER 2017 RULEMAKING, EFFECTIVE DATE OF MARCH 1, 2018
Current through Register Vol. 47, No. 5, March 10, 2024
The provisions of C.R.S. 25-8-202(1)(a), (b) and (i), (2) and (6); 25-8-203; 25-8-204; and 25-8-401; provide the specific statutory authority for adoption of these regulatory amendments. The commission also adopted in compliance with 24-4-103(4) C.R.S. the following statement of basis and purpose.
BASIS AND PURPOSE
A. Revisions to 303(d) List
This regulation updates Colorado's List of Water-Quality-Limited Segments Requiring Total Maximum Daily Loads (TMDLs) to reflect additional water quality information available since the Regulation was promulgated in 2006. This list was prepared to fulfill section 303(d) of the federal Clean Water Act (Act) which requires that states submit to the U.S. Environmental Protection Agency (EPA) a list of those waters for which technology-based effluent limitations and other required controls are not stringent enough to implement water quality standards.
This regulation also updates Colorado's Monitoring and Evaluation List (M&E List) to reflect additional water quality information available since the Regulation was promulgated in 2012.
For the draft proposal of the 2018 Regulation #93, the format of the 303(d) and M&E List tables was changed substantially. The division developed a new format generated directly from the state's assessment tracking database (ATTAINS). The new 303(d) and M&E tables can be directly linked to the state's GIS segmentation layer and the standard's database. This new format will streamline the development of the 303(d) and M&E Lists throughout the hearing process by eliminating the need to track and change listings in two places (an assessment database and a Word table). The new format will also allow for queries and reports to be easily generated and will make for efficient and accurate reporting to EPA at the conclusion of each listing cycle as well as an automated generation of the Integrated Report.
The division studied 303(d) lists from many other states to come up with the new format. The division modeled the new tables after the State of Virginia's 303(d) List. In speaking with staff from Virginia, the division learned about the efficiencies associated with using a format generated out of the tracking database and decided that Colorado should use a similar model.
The "Section 303(d) Listing Methodology - 2018 Listing Cycle" contains a description of the listing process, the criteria for listing, and the criteria for determination of TMDL priority. The Listing Methodology was developed through a public process and finalized as a policy at a Water Quality Control Commission (commission) administrative action hearing in March 2017.
This Listing Methodology sets forth the criteria that generally were used to make decisions regarding which waters to include on the 2018 Section 303(d) List and the 2018 M&E List. However, this methodology was not adopted by the commission as a rule. The commission therefore has the flexibility to take into account other appropriate factors in making site-specific listing decisions.
The commission considered all existing and readily available information in developing the 2018 Section 303(d) List. In determining whether data and information are existing and readily available, it has taken into account such data and information as the division has utilized in the preparation of those identification processes, calculations and models referenced in 40 CFR § 130.7(a)(5)(i), (ii) and (iv) and that credible data and information presented in a readily usable format and submitted in reports provided to the division as referenced in 40 CFR § 130.7(a)(5)(iii). In addition, the commission accepted credible data and information that was submitted in accordance with the listing process schedule, whether submitted by EPA or any other interested party. The division also independently collected and analyzed new data on a rotating basin basis as part of its triennial review efforts. This data and information was utilized in making listing proposals. Existing data which was not brought forward through one of the above mechanisms or otherwise presented to the commission in accordance with the schedule was not treated as "readily available" for purposes of making the 2018 listing decisions. The commission determined that such information will be considered in the next listing cycle.
In the division's "Quality Management Plan 2016 for Surface Water Monitoring and Assessment", the division states that "It is the expressed goal of the division to use only those analytical data that are both reliable and have a defined level of quality."
The objective of prioritization is to identify those segments where the division and the public should concentrate their resources. Priorities of High, Medium and Low were established according to section VI. of the 2018 Section 303(d) Listing Methodology.
The division is directed to establish a plan for monitoring and evaluating water bodies on the M&E List prior to the next listing cycle. Further, the commission has committed to determining their appropriate status (as either impaired or fully supporting) within ten years of their placement on the M&E List.
Below the 303(d) and M&E Lists, the regulation includes a table in Section 93.4 with waterbodies that are impaired but that do not require a TMDL. A TMDL may not be required for three main reasons: a TMDL has already been completed but uses are not yet attained; there is a required control mechanism in place that is expected to address all segment-pollutant combinations and will attain water quality standards in a reasonable period of time; or it has been determined that the impairment is not caused by a pollutant.
In 2016, the commission adopted a new definition of existing quality for temperature which specifies a 1 in 3 year average recurrence frequency of a "warming event". The 2018 303(d) Listing Methodology defines an allowable cumulative impact during this once in three year period. This method relies on the concept of "degree-days" which integrates both the magnitude of temperatures over the standard, as well the duration, in days, experienced by the aquatic community. Temperature excursions (air, low flow and shoulder season) are evaluated after the warming event is considered. If temperatures exceed the number of 'degree-days' specified, and the dates that exceed temperature standards do not have applicable excursions, the segment is placed on the 303(d) List as impaired for temperature.
The party proposing a temperature listing is responsible for investigating the temperature excursions as defined in Regulation No. 31, Footnote 5c, Table 1. This footnote includes three allowable excursions to exceedances of the temperature standard. These include an air temperature excursion, a low flow excursion and a winter shoulder season excursion. For the 2018 listing cycle, the division analyzed water temperature data from more than 68 stations in more than 43 segments. In cases where the excursions were evaluated and exceedances of the temperature standards remained, the commission included these segments on the 303(d) List. In cases where the excursions were not fully evaluated and exceedances of the temperature standards remained, the commission included these segments on the M&E List.
For the secondary water supply standards of dissolved iron, dissolved manganese and sulfate, the less restrictive of the following two options apply as the numeric standard: existing quality as of January 1, 2000 or the table value criteria in Regulation No. 31, Tables II and III. For dissolved iron, the table value standard (TVS) is 300 ug/l. For dissolved manganese, the TVS is 50 ug/l. For sulfate, TVS is 250 mg/l.
For the 2016 303(d) Listing Methodology, the commission included additional language regarding the determination of existing quality from the year 2000. This includes a minimum data requirement and the ability to use data collected after the year 2000 when characterizing existing quality from 2000. The utilization of data collected past the year 2000 is contingent upon there being no known new or increased sources of these parameters in the segment being assessed since 2000.
The following table summarizes the values that were used for the assessment of dissolved iron, manganese and sulfate for those waterbodies being proposed for the 303(d) or M&E List:
|
Table 1. Values Used for the Assessment of Dissolved Iron, Dissolved Manganese and Sulfate Water Supply Standards |
|||||||
|
Portion ID |
Analyte |
List |
TVS or 2000 |
Period of Record for 2000 dataset |
Value |
Units |
Sample size of 2000 dataset |
|
COARFO02a A |
Fe-D |
303(d) |
TVS |
300 |
ug/L |
||
|
COARFO02b A |
Fe-D |
303(d) |
TVS |
300 |
ug/L |
||
|
COGUNF06b C |
Fe-D |
303(d) |
TVS |
300 |
ug/L |
||
|
COGUUG01 A |
Fe-D |
M&E |
TVS |
300 |
ug/L |
||
|
COGUUG01 B |
Fe-D |
M&E |
TVS |
300 |
ug/L |
||
|
COSJAF09 A |
Fe-D |
M&E |
2000 |
95-99 |
3200 |
ug/L |
73 |
|
COSJLP05 B |
Fe-D |
M&E |
TVS |
300 |
ug/L |
||
|
OARFO04 C |
Mn-D |
303(d) |
2000 |
95-09 |
66.67 |
ug/L |
84 |
|
COARFO06 B |
Mn-D |
303(d) |
2000 |
95-09 |
60 |
ug/L |
175 |
|
COARFO06 C |
Mn-D |
303(d) |
2000 |
95-09 |
60 |
ug/L |
175 |
|
COARLA09a A |
Mn-D |
303(d) |
2000 |
95-99 |
204 |
ug/L |
47 |
|
COGULG02 A |
Mn-D |
303(d) |
TVS |
50 |
ug/L |
||
|
COGULG12 B |
Mn-D |
303(d) |
2000 |
95-04 |
94.35 |
ug/L |
18 |
|
COGUNF03_B |
Mn-D |
303(d) |
2000 |
95-99 |
72 |
ug/L |
59 |
|
COGUNF03_C |
Mn-D |
303(d) |
2000 |
95-99 |
72 |
ug/L |
59 |
|
COGUNF06b_C |
Mn-D |
303(d) |
2000 |
95-99 |
87.5 |
ug/L |
36 |
|
COGUUG19_B |
Mn-D |
303(d) |
TVS |
50 |
ug/L |
||
|
COGUUG29a_F |
Mn-D |
303(d) |
TVS |
50 |
ug/L |
||
|
COGUUN03a_A |
Mn-D |
303(d) |
2000 |
95-99 |
573.8 |
ug/L |
54 |
|
COGUUN03b_A |
Mn-D |
303(d) |
2000 |
95-99 |
412.4 |
ug/L |
67 |
|
COGUUN03c_A |
Mn-D |
303(d) |
2000 |
95-99 |
180 |
ug/L |
87 |
|
COGUUN04b_A |
Mn-D |
303(d) |
TVS |
50 |
ug/L |
||
|
COGUUN05_C |
Mn-D |
303(d) |
TVS |
50 |
ug/L |
||
|
COGUUN05_E |
Mn-D |
303(d) |
TVS |
50 |
ug/L |
||
|
CORGRG04b_B |
Mn-D |
303(d) |
TVS |
50 |
ug/L |
||
|
CORGRG04b_C |
Mn-D |
303(d) |
TVS |
50 |
ug/L |
||
|
CORGRG04b_D |
Mn-D |
303(d) |
TVS |
50 |
ug/L |
||
|
COSJAF03a_A |
Mn-D |
303(d) |
site-specific std. |
2571/ 2179 |
ug/L |
||
|
COSJAF09_A |
Mn-D |
303(d) |
2000 |
95-99 |
507.7 |
ug/L |
60 |
|
COARFO04_B |
Mn-D |
M&E |
2000 |
95-09 |
66.67 |
ug/L |
84 |
|
COARUA04b_A |
Mn-D |
M&E |
TVS |
50 |
ug/L |
||
|
COGULG04a_E |
Mn-D |
M&E |
2000 |
95-99 |
85.45 |
ug/L |
12 |
|
COSJAF04b A |
Mn-D |
M&E |
2000 |
95-99 |
259.5 |
ug/L |
369 |
|
COSJLP04c_B |
Mn-D |
M&E |
TVS |
50 |
ug/L |
||
|
COSJSJ06a_C |
Mn-D |
M&E |
TVS |
50 |
ug/L |
||
|
COSJDO04b_A |
Mn-D |
M&E |
TVS |
50 |
ug/L |
||
|
COARFO04_B |
SO4 |
303(d) |
TVS |
250 |
mg/L |
||
|
COARFO04_C |
SO4 |
303(d) |
TVS |
250 |
mg/L |
||
|
COGULG02_A |
SO4 |
303(d) |
2000 |
95-99 |
298 |
mg/L |
94 |
|
COGULG12_B |
SO4 |
303(d) |
2000 |
95-04 |
555 |
mg/L |
18 |
|
COGUUN04b_A |
SO4 |
303(d) |
2000 |
95-99 |
664 |
mg/L |
106 |
|
COSJLP08a_A |
SO4 |
303(d) |
2000 |
95-99 |
3000 |
mg/L |
65 |
|
COSJLP08a_B |
SO4 |
303(d) |
2000 |
95-99 |
3000 |
mg/L |
65 |
|
COSJLP08a_C |
SO4 |
303(d) |
2000 |
95-99 |
3000 |
mg/L |
65 |
|
COSJLP08a_D |
SO4 |
303(d) |
2000 |
95-99 |
3000 |
mg/L |
65 |
|
COSJLP08a_E |
SO4 |
303(d) |
2000 |
95-99 |
3000 |
mg/L |
65 |
|
COARLA09a_C |
SO4 |
M&E |
2000 |
95-99 |
1701 |
mg/L |
34 |
|
COGULD03a_B |
SO4 |
M&E |
2000 |
95-09 |
275 |
mg/L |
14 |
|
COGUUN04a_B |
SO4 |
M&E |
TVS |
250 |
mg/L |
||
|
COSJLP05_B |
SO4 |
M&E |
2000 |
95-04 |
739 |
mg/L |
22 |
The division submitted 3 TMDLs to EPA since the approval of the 2016 303(d) List that have been approved. The commission has removed the following segments from the 303(d) List:
* COARMA18a -Mainstem of Boggs Creek from the source to Pueblo Reservoir (Selenium, Uranium)
* COSPBD01 - Mainstem of Big Dry Creek, including all tributaries and wetlands, from the source to the confluence with the South Platte River (E. coli)
* COSPUS15 - South Platte, Burlington Ditch to Big Dry Creek (E. coli)
* COARMA04a - Mainstem of Wildhorse Creek from the source to the confluence with the Arkansas River (E. coli).
As additional water quality data are collected and assessed, new data may show attainment of the standard. The commission removed the following segments and parameters from the 303(d) List due to a recent assessment of water quality data:
|
Table 2. Water Bodies Removed from 303(d) List |
|||
|
Assessment Unit ID |
Parameter |
Assessment Unit ID |
Parameter |
|
COARFO03b A |
Dissolved copper |
COGUSM12b H |
Temperature |
|
COARLA05a A |
Total arsenic |
COGUUG02 B |
Macroinvertebrates |
|
COARMA02 B |
Dissolved manganese |
COGUUG08 A |
Dissolved cadmium |
|
COARMA18a A |
Dissolved zinc |
COGUUG11 B |
Dissolved lead |
|
COARUA04a A |
Dissolved copper |
COGUUG11 D |
Dissolved cadmium |
|
COARUA21a B |
Macroinvertebrates |
COGUUG11 D |
Dissolved manganese |
|
COGULD02 D |
Temperature |
COGUUG12 C |
Dissolved copper |
|
COGULD02 E |
Temperature |
COGUUN04c_A |
Total iron |
|
COGULG13 A |
D.O.(Temp) |
CORGCB09b B |
Macroinvertebrates |
|
COGULG15 B |
Dissolved zinc |
CORGCB12a C |
Total arsenic |
|
COGULG16 C |
Dissolved selenium |
CORGCB12a C |
Total iron |
|
COGUNF05b B |
Sulfate |
CORGRG04c_A |
Dissolved copper |
|
COGUNF09 B |
pH |
COSJLP03c A |
Total iron |
|
COGUNF09 B |
Dissolved zinc |
COSJLP11 B |
Fish mercury |
|
COGUSM02 B |
Dissolved cadmium |
COSJPI06c_A |
Macroinvertebrates |
|
COGUSM02 B |
Dissolved zinc |
COSJSJ08 B |
Dissolved oxygen |
|
COGUSM10b B |
Temperature |
COSPCH04a C |
Dissolved oxygen |
|
COGUSM12b G |
Temperature |
COUCEA09a B |
Sediment |
The commission removed the following segments and parameters from the M&E List:
|
Table 3. Water Bodies Removed from M&E List |
|||
|
Assessment Unit ID |
Parameter |
Assessment Unit ID |
Parameter |
|
COARFO01a B |
Total iron |
CORGCB02a C |
Dissolved iron |
|
COARLA04a B |
Dissolved manganese |
CORGCB02a C |
Dissolved manganese |
|
COARMA04a A |
Nitrite |
CORGCB02a C |
Total phosphorus |
|
COARMA06a A |
Dissolved manganese |
CORGCB02b B |
Dissolved iron |
|
COARMA06a A |
Sulfate |
CORGCB02b B |
Dissolved manganese |
|
COARMA07b A |
Temperature |
CORGCB02b B |
Total phosphorus |
|
COARMA09 A |
Dissolved manganese |
CORGCB02c_A |
Dissolved manganese |
|
COARMA11b A |
Total iron |
CORGCB09a B |
Dissolved manganese |
|
COARMA11b A |
Dissolved manganese |
CORGCB12a C |
Temperature |
|
COARMA18a A |
Dissolved manganese |
CORGCB12a C |
Total phosphorus |
|
COARUA24 B |
Dissolved manganese |
CORGRG04c_A |
Dissolved manganese |
|
COARUA38 B |
Dissolved iron |
CORGRG11 A |
Total phosphorus |
|
COARUA38 B |
Dissolved manganese |
CORGRG19 A |
Total phosphorus |
|
COGULD02 B |
E. coli |
CORGRG20a B |
Total phosphorus |
|
COGULD02 C |
E. coli |
CORGRG20a C |
Total phosphorus |
|
COGULD02 D |
E. coli |
CORGRG20b A |
Total phosphorus |
|
COGULD02 E |
E. coli |
CORGRG37 A |
Dissolved manganese |
|
COGULD03a B |
E. coli |
CORGRG38 D |
Dissolved silver |
|
COGULG04a B |
Sulfate |
CORGRG38 D |
Dissolved iron |
|
COGULG04b B |
Sulfate |
COSJLP03c_A |
Dissolved copper |
|
COGULG07a A |
Dissolved selenium |
COSJLP04c_C |
Temperature |
|
COGULG07b D |
Dissolved lead |
COSJLP04c_D |
Temperature |
|
COGULG08a A |
Temperature |
COSJPI05a A |
Temperature |
|
COGULG08b A |
Temperature |
COSJPI05a B |
Dissolved copper |
|
COGUSM02 B |
Dissolved lead |
COSJPI05a B |
pH |
|
COGUSM02 C |
Dissolved lead |
COSJPI05a B |
Temperature |
|
COGUSM03b A |
Dissolved lead |
COSJPI05b A |
Temperature |
|
COGUSM04a B |
Dissolved lead |
COSJPI06a C |
Total iron |
|
COGUSM12a D |
Dissolved oxygen |
COSJPI06a C |
Sulfate |
|
COGUSM12a F |
Dissolved selenium |
COSJPI06a E |
Total iron |
|
COGUSM12b C |
Temperature |
COSJPI06a E |
Sulfate |
|
COGUSM12b D |
Temperature |
COSJPI06a G |
Total iron |
|
COGUSM12b F |
Temperature |
COSJPI06a G |
Sulfate |
|
COGUSM12c_A |
Temperature |
COSJPI06c_ A |
E. coli |
|
COGUUG01 B |
Total iron |
COSJPI06c_ A |
Total iron |
|
COGUUG04 B |
Dissolved lead |
COSJPI06c_ A |
Sediment |
|
COGUUG16a A |
E. coli |
COSJPI06c_ A |
Sulfate |
|
COGUUG23 B |
Dissolved iron |
COSJPI08 A |
Dissolved oxygen |
|
COGUUG26 B |
Dissolved copper |
COSJPI08 A |
Dissolved zinc |
|
COGUUN04c_A |
Dissolved lead |
COSJSJ05 D |
Dissolved lead |
|
COGUUN07 A |
Total iron |
COSJSJ05 E |
Dissolved lead |
|
COGUUN09 C |
Dissolved lead |
COSJSJ06a C |
Dissolved copper |
|
COGUUN10a C |
Sulfate |
COSJSJ06a C |
Dissolved lead |
|
COGUUN11 E |
Sulfate |
COSJSJ06a C |
Temperature |
|
COGUUN11 H |
Dissolved selenium |
COSJSJ06a D |
Dissolved lead |
|
COGUUN11 J |
Dissolved selenium |
COSJSJ06b B |
Temperature |
|
CORGAL02 B |
Dissolved iron |
COSJSJ06b C |
Temperature |
|
CORGAL02 B |
pH |
COSJSJ08 B |
pH |
|
CORGAL02 C |
Dissolved iron |
COSJSJ09a A |
Dissolved silver |
|
CORGAL02 C |
pH |
COSJSJ09a A |
Dissolved lead |
|
CORGAL03b B |
Dissolved selenium |
COUCEA09a A |
Sediment |
|
CORGAL03c A |
Ammonia |
COUCEA09b B |
Sediment |
|
CORGAL10 A |
Total iron |
COUCEA09b C |
Sediment |
|
CORGCB02a B |
Dissolved manganese |
COLCLC04e |
Total iron |
|
Table 4. Summary of Water Bodies Added, Removed and Retained on the 303(d) and M&E Lists by Analyte |
|||
|
Parameter |
Action |
# of Portions |
Assessment Unit IDs |
|
Dissolved Silver Dissolved Silver |
Delist from M&E |
2 |
CORGRG38_D; COSJSJ09a_A |
|
New listing on M&E |
3 |
COGUUG10b_A; COSJAF03a_A; COSJAF03a_B |
|
|
Retain on M&E List |
10 |
COARUA05_C; COGUUG31_A; CORGRG33_B; COSJAF13a_B; COSJAF22_B; COSPBO14_B; COSPCP07_B; COSPCP07_C; COSPSV02b_A; COSPSV02b_B |
|
|
Retain on 4a List due to approved TMDL |
2 |
CORGCB09a_A; CORGCB09a_B |
|
|
New listing on 303(d) |
1 |
COGUNF04c_A |
|
|
Retain on 303(d) List |
2 |
COGUUN06a_A; COSJLP01_A |
|
|
Dissolved Aluminum |
Retain on 4a List due to approved TMDL |
1 |
COARUA12a_A |
|
Total Aluminum |
Retain on 4a List due to approved TMDL |
11 |
COARUA11_A; CORGAL03a_A; CORGAL03b_A; CORGAL03b_B; CORGAL03c_A; COSJAF02_B; COSJAF03a_B; COSJAF03b_A; COSJAF06_B; COSJAF07_A; COSJAF08_A |
|
New listing on 303(d) |
1 |
COSJAF09_A |
|
|
Retain on 303(d) List |
2 |
CORGAL03d_A; COSJAF04a_A |
|
|
Total Arsenic |
Delist from 303(d) |
2 |
COARLA05a_A; CORGCB12a_C |
|
Delist due to extent of impairment refined |
2 |
CORGCB12a_B; CORGCB12a_E |
|
|
New listing on M&E |
25 |
COARUA04b_A; COARUA12a_A; COARUA20b_A; COGULG16_C; COGUSM12b_F; COGUSM12b_H; COGUUG04_B; COGUUG05a_A; COGUUG18b_A; COGUUG30_B; COGUUG30_C; CORGRG05_B; COSJAF10a_A; COSJDO04b_A; COSJDO05a_B; COSJDO05a_C; |
|
|
Total Arsenic |
COSJDO10b_A; COSJLP05_B; COSJLP11_B; COSJPI08_A; COSJPN02a_A; COSJPN05_A; COSJSJ06b_B; COSJSJ08_B; COSJSJ09a_A |
||
|
Retain on M&E List |
31 |
COARLA09a_C; COARMA11b_A; COARUA38_B; COGUUG29a_C; COGUUG29a_D; COGUUG29a_E; COLCLC02b_B; COLCLC14c_B; COLCLC14c_C; COLCLC20_B; CORGAL20_A; CORGRG37_A; COSPBE11_B; COSPCP07_B; COSPCP07_C; COSPLA02a_A; COSPLA02b_A; COSPUS03_F; COSPUS12_B; COUCBL12_B; COUCBL12_C; COUCEA09b_B; COUCEA09b_C; COUCNP04a_C; COUCNP04a_D; COUCUC03_A; COUCUC03_B; COUCUC03_C; COUCUC12_D; COUCYA08_C; COUCYA18_B |
|
|
New listing on 303(d) |
54 |
COARLA11_A; COARLA15_B; COARMA07b_A; COARMA13a_B; COARMA18a_A; COARMA26_B; COARMA26_C; COARUA02a_A; COARUA05_B; COARUA07_A; COGUNF04b_B; COGUNF04b_C; COGUNF06b_C; COGUSM02_C; COGUSM08_A; COGUSM12a_D; COGUSM12b_G; COGUUG01_B; COGUUG01_C; COGUUG07_A; COGUUG16a_B; COGUUG19_B; COGUUG21_A; COGUUG23_A; COGUUG23_B; COGUUG24_A; COGUUG24_B; COGUUG26_B; COGUUG26_D; COGUUG26_E; COGUUG29b_C; COGUUN04a_B; COGUUN04b_A; COGUUN10a_C; COGUUN11_C; COGUUN11_E; COGUUN11_G; COGUUN11_H; COGUUN11_I; COGUUN11_J; CORGAL02_B; CORGAL02_C; CORGAL14a_B; CORGRG02_A; CORGRG02_B; CORGRG04b_B; CORGRG05_C; CORGRG38_D; CORGRG38_E; COSJLP04c_C; COSJPI05a_A; COSJPI05a_B; COUCEA05a_A; COUCEA05b_A |
|
|
Moved from M&E to 303(d) |
3 |
COARLA10_B; COARUA35_A; COGULD05_D |
|
|
Total Arsenic Total Arsenic |
Retain on 303(d) List |
130 |
COARFO01a_B; COARLA01b_A; COARLA01c_A; COARLA05b_A; COARLA05b_B; COARLA09a_A; COARLA09a_B; COARMA03_A; COARMA09_A; COARUA02c_A; COARUA05_C; COARUA15_B; COARUA15_C; COGUNF04a_B; COGUUG09_B; COGUUG09_C; COGUUG09_D; COGUUG11_B; COGUUG11_D; COGUUG12_C; COLCLC01_B; COLCLC04c_A; COLCLC10_A; COLCLC10_B; COLCLC15a_A; COLCLC15c_A; COLCLY03c_C; COLCWH07_B; COLCWH12_A; COLCWH14a_A; COLCWH14a_B; COLCWH20_B; COLCWH20_C; COLCWH21_A; CORGCB02a_B; CORGCB02a_C; CORGCB02b_B; CORGCB02c_A; CORGCB04_A; CORGCB09b_A; CORGCB09b_B; CORGCB12a_D; CORGRG04b_C; CORGRG04b_D; CORGRG04c_A; CORGRG09_B; CORGRG11_A; CORGRG19_A; COSPBE02_A; COSPBE02_B; COSPBE02_C; COSPBO02a_A; COSPBO02a_B; COSPBO02a_C; COSPBO02a_D; COSPBO02a_E; COSPBO02a_F; COSPBO02b_B; COSPBO02b_C; COSPBO03_A; COSPBO03_B; COSPBO04b_B; COSPBO09_A; COSPBO09_B; COSPBO10_A; COSPBO14_B; COSPBT01_A; COSPBT02_A; COSPBT02_B; COSPBT02_C; COSPBT02_D; COSPBT03_A; COSPBT07_A; COSPBT07_B; COSPBT08_A; COSPBT08_B; COSPBT11_A; COSPCP02a_A; COSPCP06_A; COSPCP09_A; COSPCP10a_A; COSPCP10b_A; COSPCP14_A; COSPMS01b_A; COSPRE01_A; COSPSV02b_A; COSPSV02b_B; COSPSV07_B; COSPUS02c_C; COSPUS02c_D; COSPUS03_C; COSPUS03_D; COSPUS10a_C; COSPUS14_B; COSPUS14_C; COSPUS17a_D; COUCBL02c_A; COUCBL04a_B; COUCBL20_B; COUCEA02_A; |
|
COUCEA05c_A; COUCEA06_A; COUCEA06_C; COUCEA06_D; COUCEA06_E; COUCEA06_F; COUCEA06_G; COUCEA06_H; COUCEA09a_A; COUCEA09a_B; COUCEA09c_A; COUCNP01_B; COUCNP04a_F; COUCNP04a_G; COUCNP04a_H; COUCNP04b_B; COUCNP05b_A; COUCNP09_C; COUCNP09_D; COUCUC07a_C; COUCUC07b_C; COUCUC10c_A; COUCUC10c_B; COUCUC10c_C; COUCUC12_B; COUCYA02a_A; COUCYA02b_A; COUCYA03_D; COUCYA03_E; COUCYA15_B |
|||
|
Aquatic Life Aquatic Life |
Delist due to extent of impairment refined |
1 |
COSJSJ05_D |
|
New listing on M&E |
8 |
COARLA06a_F; COARMA04b_B; COGULD02_B; COGULD02_C; COGULD02_D; COGULD02_E; COGUUN09_B; COSJLP04c_C |
|
|
Added to M&E due to database correction |
1 |
COSJLP04c_D |
|
|
Retain on M&E List |
25 |
COARUA05_B; COARUA14c_B; COARUA15_B; COARUA15_C; COLCLY03i_A; COLCWH13b_D; CORGRG07_A; CORGRG07_B; COSJSJ05_E; COSPBO07b_A; COSPBO07b_B; COSPCL01_B; COSPCL02c_B; COSPCL02c_C; COSPCL02c_D; COSPUS01a_D; COSPUS02a_C; COSPUS03_B; COUCBL17_A; COUCBL17_B; COUCEA06_E; COUCEA06_G; COUCUC03_B; COUCUC03_C; COUCUC03_D |
|
|
Retain on 4b List due to 4b Plan |
1 |
COSPCL03a_C |
|
|
New listing on 303(d) |
4 |
COGUUG10a_A; COGUUG10b_A; COSJLP07a_C; COSJLP07b_B |
|
|
Retain on 303(d) List |
26 |
COGUUG01_B; COGUUG04_B; COGUUG15a_B; COLCLY22a_B; COLCWH07_A; COLCWH07_B; COLCWH13c_A; COLCWH13c_B; COLCWH23_C; CORGCB02a_B; CORGCB02b_B; CORGRG11_A; |
|
|
CORGRG20a_B; CORGRG20a_C; COSPBT02_A; COSPBT02_B; COSPBT02_C; COSPBT02_D; COSPCL14a_B; COSPUS01a_C; COSPUS03_D; COSPUS03_E; COSPUS03_F; COSPUS11a_B; COUCRF03a_C; COGUUN05_E |
|||
|
Aquatic Life (Provisional) |
Delist from 303(d) |
4 |
COARUA21a_B; COGUUG02_B; CORGCB09b_B; COSJPI06c_A |
|
Delist due to new segmentation |
2 |
COSJLP05_C; COSJLP06b_B |
|
|
Retain on M&E List |
1 |
COUCEA06_H |
|
|
New listing on 303(d) |
16 |
COARLA06a_E; COGULD05_E; COGUSM07_A; COGUSM07_B; COGUSM07_C; COGUUG26_D; CORGAL09_A; CORGAL10_A; CORGRG23a_B; CORGRG23b_A; COSJAF05a_B; COSJAF05a_C; COSJLP05_B; COSJLP08_E; COSJLP09_B; COUCRF03a_E |
|
|
Moved from M&E to 303(d) |
1 |
COSJSJ05_D |
|
|
Retain on 303(d) List |
51 |
COARFO03a_B; COARFO06_B; COARFO06_C; COARLA06a_B; COGUSM12a_E; COGUSM12b_D; COGUUG18b_A; COGUUG19_B; COGUUG24_B; COGUUG26_C; COGUUN11_C; COLCWH15_B; COLCWH15_C; COLCWH20_B; COLCWH20_C; CORGRG12_A; COSJLP06a_B; COSJPI06a_E; COSJPI06a_F; COSJPI06d_A; COSPBE02_A; COSPBE02_B; COSPBE02_C; COSPBO02a_D; COSPBO03_B; COSPBO07a_A; COSPBO09_B; COSPCP02a_A; COSPLS02b_C; COSPUS01a_A; COSPUS03_C; COSPUS06a_B; COSPUS10a_B; COSPUS10a_C; COSPUS11b_B; COUCBL01_A; COUCBL02b_A; COUCBL02c_A; COUCBL05_A; COUCEA06_C; COUCEA06_D; COUCEA06_F; COUCEA08_A; COUCEA09a_B; COUCNP04a_D; COUCRF03a_B; COUCRF03d_B; COUCRF07_B; COUCUC10a_C; COUCUC10a_D; COUCYA12_B |
|
|
Dissolved Cadmium |
Delist from 303(d) |
3 |
COGUSM02_B; COGUUG08_A; COGUUG11_D |
|
Delist due to approved TMDL |
3 |
COARUA02b_A; COARUA02c_A; COARUA05_D |
|
|
New listing on M&E |
4 |
COARUA07_A; COGUUG07_B; COGUUN05_B; CORGRG06_B |
|
|
Retain on M&E List |
14 |
COGUUG29a_C; COGUUG29a_D; COGUUG29a_E; COLCLC04e_A; CORGAL03c_A; CORGAL20_A; CORGCB12a_C; CORGRG05_B; CORGRG07_A; CORGRG07_B; COSPCL03b_A; COSPCL06_C; COSPUS01b_C; COUCBL04a_B |
|
|
Retain on 4a List due to approved TMDL |
44 |
COARUA03_A; COARUA04a_A; COARUA04b_A; COARUA08b_A; COARUA11_A; COGUSM03a_A; COGUSM03b_A; COGUSM06a_A; COGUSM06b_A; COGUUG30_B; COGUUG31_A; COGUUN02_A; COGUUN03a_A; COGUUN03b_A; COGUUN03c_A; COGUUN03d_A; COGUUN03e_B; COGUUN03e_C; COGUUN03f_A; CORGCB09a_A; CORGCB09b_A; CORGCB09b_B; CORGRG04a_A; CORGRG04b_B; CORGRG04b_C; CORGRG04b_D; COSJAF02_B; COSJAF03a_B; COSJAF03b_A; COSJAF06_B; COSJAF07_A; COSJAF08_A; COSJDO09_A; COSPBO04a_B; COSPCL13b_A; COSPSV04a_A; COSPSV04a_B; COSPSV04b_B; COSPUS05a_A; COSPUS15_B; COSPUS15_C; COUCBL06a_B; COUCBL07_A; COUCBL12_B |
|
|
New listing on 303(d) |
7 |
COGUNF04c_A; COGUUN05_C; COGUUN05_E; COGUUN08_A; CORGAL03a_A; CORGRG04c_A; COSJAF04a_A |
|
|
Moved from M&E to 303(d) |
1 |
COARUA05_B |
|
|
Retain on 303(d) List |
26 |
COARUA05_C; COARUA12a_A; COGUUG10a_A; COGUUG10b_A; COGUUG11_B; COGUUG12_C; COGUUG29a_B; COGUUN09_B; COGUUN09_D; COSJAF03c_A; COSPCL02a_A; COSPCL02c_B; COSPCL02c_C; COSPCL02c_D; |
|
|
COSPCL09b_A; COSPCL11_A; COSPCL12a_A; COSPCL12a_B; COSPCL13b_B; COSPCP07_B; COSPCP07_C; COSPUS02b_A; COSPUS02c_A; COSPUS02c_C; COSPUS02c_D; COUCEA05c_A |
|||
|
Total Cadmium |
New listing on M&E |
1 |
COARFO01a_B |
|
Chlorophyll a |
Retain on 303(d) List |
2 |
COSPBE01c_A; COSPCH02_A |
|
Chloride |
New listing on 303(d) |
1 |
COGULD02_C |
|
Dissolved Copper Dissolved Copper |
Delist from M&E |
4 |
COGUUG26_B; COSJLP03c_A; COSJPI05a_B; COSJSJ06a_C |
|
Delist from 303(d) |
4 |
COARFO03b_A; COARUA04a_A; COGUUG12_C; CORGRG04c_A |
|
|
Delist due to approved TMDL |
1 |
COSJAF06_B |
|
|
New listing on M&E |
6 |
COARMA04b_B; COGUUN05_B; CORGRG07_A; CORGRG07_B; COSJDO05a_C; COSJLP01_A |
|
|
M&E listing due to new segmentation |
2 |
COSJLP04c_C; COSJSJ06b_C |
|
|
Retain on M&E List |
20 |
COGUUN09_D; COLCLC04e_A; COLCLC13a_B; COLCLY07_A; CORGAL20_A; CORGCB03_B; CORGCB05_A; CORGCB10_B; CORGRG05_B; CORGRG09_B; CORGRG25_A; CORGRG28_B; COUCBL12_B; COUCBL12_C; COUCNP04a_F; COUCNP05b_A; COUCNP06_A; COUCRF02_A; COUCUC08_B; COUCYA18_A |
|
|
Added to 4a List due to database correction |
1 |
COSJLP04a_E |
|
|
Retain on 4a List due to approved TMDL |
47 |
COARUA10_A; COARUA11_A; COGUUN02_A; COGUUN03a_A; COGUUN03b_A; COGUUN03c_A; COGUUN03d_A; COGUUN03e_B; COGUUN03e_C; COGUUN03f_A; CORGAL03a_A; CORGAL03b_A; CORGAL03b_B; CORGAL03c_A; CORGAL03d_A; CORGAL08_A; CORGAL09_A; CORGCB09b_A; CORGCB09b_B; COSJAF02_B; COSJAF03a_B; COSJAF03b_A; COSJAF04a_A; COSJAF07_A; |
|
|
Dissolved Copper |
COSJAF08_A; COSJAF09_A; COSJLP04c_D; COSJLP04c_E; COSPBO04a_B; COSPCL02a_A; COSPCL02b_B; COSPCL02c_C; COSPCL09a_C; COSPCL09b_A; COSPSV04a_B; COSPSV04b_B; COSPSV04c_A; COSPUS04_C; COSPUS04_E; COSPUS05a_A; COSPUS05b_A; COUCBL06a_B; COUCBL07_A; COUCEA05a_A; COUCEA05b_A; COUCEA05c_A; COUCEA07b_A |
||
|
New listing on 303(d) |
4 |
COARUA05_A; COARUA05_B; COGUUN05_C; COSJDO04a_B |
|
|
Moved from M&E to 303(d) |
4 |
COGUSM06a_A; COGUSM06b_A; COGUUG31_A; COGUUN08_A |
|
|
Retain on 303(d) List |
37 |
COARUA05_C; COARUA30_B; COGULD05_B; COGUUG10a_A; COGUUG10b_A; COGUUG29a_B; COGUUN06a_A; COGUUN07_A; CORGCB03_D; CORGRG04b_B; COSPBE01e_B; COSPBO02a_B; COSPBO02a_C; COSPBO04a_A; COSPBO04b_B; COSPBO14_B; COSPBT01_A; COSPBT02_C; COSPBT03_A; COSPBT07_B; COSPBT16_B; COSPCL02c_B; COSPCL03a_B; COSPCL03b_A; COSPCL05_B; COSPCL06_C; COSPCL09a_B; COSPCL10_A; COSPCL12a_A; COSPCL12a_B; COSPLA02b_A; COSPSV02b_B; COSPSV05_A; COSPSV05_B; COUCBL04a_C; COUCUC02_D; COUCUC10a_D |
|
|
Dissolved Oxygen (Temperature) |
Delist from 303(d) |
1 |
COGULG13_A |
|
New listing on 303(d) |
1 |
CORGRG38_E |
|
|
Dissolved Oxygen |
Delist from M&E |
2 |
COGUSM12a_D; COSJPI08_A |
|
Delist from 303(d) |
2 |
COSJSJ08_B; COSPCH04a_C |
|
|
New listing on M&E |
6 |
COGUNF04c_A; COGUSM02_E; COGUSM14_B; CORGRG02_B; CORGRG20a_B; CORGRG23b_A |
|
|
Retain on M&E List |
12 |
COGUSM07_C; COGUSM10b_B; COLCLC04b_A; CORGCB05_A; COSPBT10_A; COSPCL12a_A; COSPUS03_E; COSPUS03_F; |
|
|
Dissolved Oxygen |
COSPUS03_H; COSPUS09_B; COUCUC06b_A; COUCYA04_A |
||
|
Retain on 4a List due to approved TMDL |
6 |
COGULG09_A; COSPMS04_A; COSPMS04_B; COSPUS15_B; COSPUS15_C; COSPUS15_D |
|
|
Added to 303d List due to database correction |
1 |
COSJLP04c_D |
|
|
303d listing due to new segmentation |
1 |
COSJLP04c_C |
|
|
Retain on 303(d) List |
19 |
COARUA10_A; COARUA35_A; COGUSM02_D; CORGAL25_B; COSPCH02_A; COSPCH06_B; COSPCL17a_A; COSPCP20_B; COSPLS03_B; COSPUS03_B; COSPUS17a_D; COSPUS17a_E; COSPUS23_B; COSPUS23_C; COSPUS23_D; COUCNP07b_A; COUCUC12_B; COARLA15_B; COGUSM20_B |
|
|
E.coli |
Delist from M&E |
7 |
COGULD02_B; COGULD02_C; COGULD02_D; COGULD02_E; COGULD03a_B; COGUUG16a_A; COSJPI06c_A |
|
Delist due to extent of impairment refined |
2 |
COSJPI06a_C; COSJPI06a_G |
|
|
Delist due to new segmentation |
1 |
COSJDO11a_A |
|
|
New listing on M&E |
4 |
COARMA04c_A; COARMA04g_A; COARUA15_B; COGUUG26_B |
|
|
Retain on M&E List |
34 |
COARLA03a_A; COARLA07_A; COGULD04_B; COGULD05_B; COGULG04a_B; COGULG12_B; COGUSM10b_B; COGUUG16a_B; COGUUG16b_A; COGUUG17a_A; COGUUG17b_A; COLCLC10_A; COLCLC10_B; COLCLC14b_A; COLCLY22c_A; COLCWH16b_B; COSJAF13a_B; COSJDO11b_A; COSJLP08_A; COSJLP08_B; COSJLP08_C; COSJLP08_D; COSJLP08_E; COSJPI06a_E; COSJSJ01b_B; COSJSJ03_A; |
|
|
E. coli |
COSJSJ10_A; COSPBO08_B; COSPBT05_A; COSPCL17b_A; COSPCP08_A; COSPRE05_A; COUCNP04a_B; COUCYA13b_B |
||
|
Delist due to approved TMDL |
5 |
COSPBD01_A; COSPBD01_B; COSPUS15_B; COSPUS15_C; COSPUS15_D |
|
|
Retain on 4a List due to approved TMDL |
2 |
COSPBO02b_B; COSPUS14_B |
|
|
New listing on 303(d) |
4 |
COARFO02b_A; COARFO06_C; COARMA03_A; COGULG04c_A |
|
|
Retain on 303(d) List |
34 |
COARFO01a_B; COARFO02a_A; COARFO04_B; COARFO04_D; COARFO04_G; COARLA01a_A; COARLA09a_C; COARMA04a_A; COGULG02_A; COGULG02_B; COLCLC13b_C; CORGRG28_B; COSJLP07a_C; COSPBO07b_A; COSPBO07b_B; COSPBO10_A; COSPCH03_A; COSPCH03_B; COSPCH04a_B; COSPCL18a_A; COSPCP11_A; COSPCP13b_A; COSPLS02b_B; COSPMS01a_A; COSPMS01b_A; COSPSV03_B; COSPSV03_C; COSPSV03_D; COSPSV03_E; COSPSV06_B; COSPUS16a_A; COSPUS16i_A; COSPUS16i_B; COUCYA08_B; |
|
|
E. coli (seasonal) |
Retain on 303(d) List |
10 |
COSPBE02_C, COSPBO09_A, COSPBO09_B, COSPBT09_A, COSPCL15_A, COSPCP12_A, COSPCP13a_C, COSPUS10a_D, COSPUS16c_A, COARFO06_B |
|
Retain on M&E List |
2 |
COGUNF04b_C; COLCLC04c_A |
|
|
Delist from 303(d) |
1 |
COARFO06_C |
|
|
Dissolved Iron |
Delist from M&E |
7 |
COARUA38_B; COGUUG23_B; CORGAL02_B; CORGAL02_C; CORGCB02a_C; CORGCB02b_B; CORGRG38_D |
|
New listing on M&E |
4 |
COARFO02a_A; COGUUG01_B; COGUUG01_C; COSJLP05_B |
|
|
Retain on M&E List |
17 |
COLCLC10_B; CORGAL20_A; CORGRG38_C; COSPBO02a_B; COSPBO14_B; COSPCL06_C; COSPCL12a_B; COSPCL14b_A; COSPCP07_B; COSPCP07_C; COUCBL20_B; COUCNP03_A; COUCNP04a_B; COUCNP04a_F; COUCNP05b_A; COUCUC10c_A; COUCYA18_B |
|
|
Retain on 4a List due to approved TMDL |
13 |
COSJAF02_B; COSJAF03a_B; COSJAF03b_A; COSJAF04a_A; COSJAF06_B; COSJAF07_A; COSJAF08_A; COSPCL13b_A; COSPCL13b_B; COSPSV04b_B; COSPUS02c_A; COSPUS02c_C; COSPUS02c_D |
|
|
New listing on 303(d) |
3 |
COARFO02b_A; COGUNF06b_C; COSJDO04b_A |
|
|
Moved from M&E to 303(d) |
2 |
COGUUG15a_B; CORGRG02_B |
|
|
Retain on 303(d) List |
9 |
COARUA05_C; COGUUG29a_B; COSPBO02a_F; COSPCL02c_B; COUCEA05c_A; COUCNP04a_H; COUCUC10c_B; COUCUC10c_C; COUCUC12_D |
|
|
Total Recoverable Iron |
Delist from M&E |
10 |
COARFO01a_B; COARMA11b_A; COGUUG01_B; COGUUN07_A; COLCLC04e_A, CORGAL10_A; COSJPI06a_C; COSJPI06a_E; COSJPI06a_G; COSJPI06c_A |
|
Delist from 303(d) |
3 |
COGUUN04c_A; CORGCB12a_C; COSJLP03c_A |
|
|
Delist due to extent of impairment refined |
2 |
CORGCB12a_B; CORGCB12a_E |
|
|
New listing on M&E |
10 |
COARMA04b_B; COGULD03a_B; COGULD05_E; COGUSM12b_H; COGUUN11_H; CORGRG23a_C; COSJLP08_A; COSJLP08_B; COSJLP08_C; COSJLP08_E |
|
|
Retain on M&E List |
34 |
COARFO02a_A; COARFO05_A; COARLA09a_C; COARLA12_B; COGULD04_B; COGULG04a_F; COGUNF06a_C; COGUSM07_B; COGUUG15a_B; COLCLC10_B; COLCLC13a_B; COLCLC14b_A; COLCLC15a_A; COLCLC16_A; COLCLY03c_C; COLCLY22c_A; |
|
|
Total Recoverable Iron |
COLCWH07_B; CORGAL02_B; CORGAL02_C; CORGAL12_A; CORGAL20_A; CORGCB03_C; CORGRG03_A; COSJPI08_A; COSPCL06_C; COSPUS01b_B; COSPUS03_E; COSPUS03_F; COSPUS03_G; COSPUS07_B; COSPUS11a_A; COSPUS23_E; COUCNP04a_E; COUCRF03b_B |
||
|
Retain on 4a List due to approved TMDL |
9 |
COGUUN03a_A; COGUUN03b_A; COGUUN03c_A; COGUUN03d_A; COGUUN03e_B; COGUUN03e_C; COGUUN03f_A; CORGAL08_A; COSJAF09_A |
|
|
New listing on 303(d) |
17 |
COARFO02b_A; COARLA04a_A; COARLA04a_B; COARLA09b_A; COGULG02_A; COGULG02_B; COGULG04a_C; COGULG12_B; COGUNF04b_C; COGUSM12b_G; COGUUG19_B; COGUUG31_A; COGUUN04a_B; COSJSJ06b_B; COSJSJ09a_A; COGUSM12b_F; COGUSM12b_I |
|
|
Moved from M&E to 303(d) |
3 |
COGUNF06b_B; COGUNF06b_C; CORGCB02b_B |
|
|
Retain on 303(d) List Retain on the 303(d) list |
41 41 |
COARLA09a_B; COARLA09b_B; COARMA10_A; COARMA14_A; COGULD02_B; COGULD02_C; COGULD02_D; COGULD02_E; COGULD05_B; COGULG07b_C; COGULG15_B; COGUNF04b_B; COGUUG29a_B; COGUUN12_C; COGUUN12_D; COLCLC04a_B; COLCLC04a_D; COLCLC13b_A; COLCLC13b_B; COLCLC13b_C; COLCLC13b_D; COLCLC14c_C; COLCLY03c_B; COLCWH13c_A; COLCWH13c_B; CORGAL13_A; CORGCB12a_D; CORGCB19_A; CORGRG02_B; COSJLP07a_C; COSJLP07b_B; COSJLP08_D; COSPBD01_B; COSPBO02a_F; COSPCL02c_B; COSPUS03_D; COUCNP04a_H; COUCUC07a_B; COUCYA03_D; COUCYA13d_A; COUCYA13d_B |
|
|
Fish Tissue Mercury |
Retain on M&E List |
4 |
COARMA27_A; COSJSJ08_C; COSPBO18_A; COSPUS19_B |
|
Delist due to approved TMDL |
1 |
COSJLP11_B |
|
|
Retain on 4a List due to approved TMDL |
2 |
CORGRG37_A; COSJDO04b_B |
|
|
New listing on 303(d) |
1 |
COSJLP11_A |
|
|
Retain on 303(d) List |
14 |
COARLA15_B; COARMA26_B; COARUA40_A; COLCLC20_B; COSJLP11_C; COSJPN03_A; COSJSJ08_B; COSPBT11_A; COSPCP14_A; COSPUS17a_D; COSPUS17a_E; COUCNP09_B; COUCYA22_B; COUCYA23_A |
|
|
Dissolved Mercury |
Retain on M&E List |
2 |
COSPUS03_F; COUCYA08_C |
|
Retain on 303(d) List |
1 |
COSPUS03_D |
|
|
Dissolved Manganese Dissolved Manganese |
Delist from M&E |
14 |
COARLA04a_B; COARMA06a_A; COARMA09_A; COARMA11b_A; COARMA18a_A; COARUA24_B; COARUA38_B; CORGCB02a_B; CORGCB02a_C; CORGCB02b_B; CORGCB02c_A; CORGCB09a_B; CORGRG04c_A; CORGRG37_A |
|
Delist from 303(d) |
2 |
COARMA02_B; COGUUG11_D |
|
|
New listing on M&E |
5 |
COARUA04b_A; COGULG04a_E; COSJAF04b_A; COSJDO04b_A; COSJSJ06b_B |
|
|
Retain on M&E List |
43 |
COARLA05b_B; COARLA09b_A; COARLA09b_B; COGUSM08_A; COGUUG17a_A; COGUUG17b_A; COGUUG29a_D; COGUUG29a_E; COLCLC02b_B; COLCLY03c_B; COLCLY06_A; COLCWH09b_A; COLCWH13b_B; CORGAL02_B; CORGAL02_C; CORGAL20_A; CORGCB04_A; CORGCB12a_C; CORGRG05_B; CORGRG38_C; COSPBO02a_D; COSPBO14_B; COSPBT07_A; COSPCH01_A; COSPCL03b_A; COSPCL09b_A; COSPCL12a_A; COSPCL12a_B; COSPCL14b_A; COSPCL16a_A; COSPLA02a_A; COSPMS01a_A; COSPSV04a_B; COUCBL12_B; COUCBL12_C; COUCNP04a_B; COUCNP04a_E; COUCNP04b_B; COUCNP05b_A; COUCUC07a_B; |
|
|
Dissolved Manganese |
COUCYA02a_A; COUCYA03_D; COUCYA04_A |
||
|
Retain on 4a List due to approved TMDL |
11 |
COSJLP04a_E; COSJLP04c_D; COSJLP04c_E; COSPCL13b_A; COSPCL13b_B; COSPSV04b_B; COSPUS02c_A; COSPUS02c_C; COSPUS02c_D; COSPUS05a_A; COUCBL07_A |
|
|
New listing on 303(d) |
25 |
COARFO06_B; COARFO06_C; COARLA01a_A; COARLA09a_A; COGULG02_A; COGULG02_B; COGULG12_B; COGUNF03_B; COGUNF03_C; COGUNF06b_C; COGUUG02_D; COGUUG12_C; COGUUG19_B; COGUUG31_A; COGUUN03a_A; COGUUN03b_A; COGUUN03c_A; COGUUN04b_A; COGUUN05_C; COGUUN05_E; CORGRG04b_C; CORGRG04b_D; COSJAF03a_A; COSJAF03a_B; COSJAF04a_A; |
|
|
Moved from M&E to 303(d) |
8 |
COARLA02a_A; COARLA09a_B; COARUA05_B; COGUNF06b_B; COGUSM06a_A; COGUUG15a_B; CORGRG02_B; CORGRG38_D |
|
|
Retain on 303(d) List |
32 |
COARFO01a_B; COARLA01b_A; COARLA01c_A; COARMA06b_A; COARUA05_C; COGULG04a_D; COGUUG29a_B; COGUUG29a_C; COGUUG32_A; COGUUN02_A; COLCLC14c_B; COLCLC14c_C; COSJAF05a_B; COSJAF05a_C; COSPCL02c_B; COSPCP07_B; COSPCP07_C; COSPCP13a_B; COSPLS01_A; COSPMS01b_A; COSPSV05_B; COSPSV06_A; COSPSV06_B; COSPUS03_B; COSPUS05b_B; COUCBL02a_A; COUCBL02a_B; COUCBL06a_B; COUCBL06a_C; COUCNP04a_H; COUCUC07b_C; COUCUC12_D |
|
|
Delist from M&E |
1 |
CORGAL03c_A |
|
|
Retain on M&E List |
2 |
COSPCL14b_A; COSPUS23_F |
|
|
Ammonia |
Retain on 4a List due to approved TMDL |
6 |
COSPBO09_A; COSPBO09_B; COSPBO10_A; COSPSV03_B; COSPSV03_E; COUCUC06c_A |
|
Retain on 4b List due to 4b Plan |
3 |
COSPUS15_B; COSPUS15_C; COSPUS15_D |
|
|
New listing on 303(d) |
1 |
COARMA04c_A |
|
|
Retain on 303(d) List |
9 |
CORGCB19_A; COSPCL15_A; COSPMS04_B; COSPMS07_B; COSPMS07_C; COSPUS05c_B; COSPUS17a_B; COSPUS17a_F; COSPUS17a_G |
|
|
Dissolved Nickel |
New listing on M&E |
1 |
CORGAL07_A |
|
Retain on 303(d) List |
2 |
COSPCL02c_B; COSPCL12a_B |
|
|
Nitrite |
Delist from M&E |
1 |
COARMA04a_A |
|
Retain on M&E List |
1 |
COLCLC02b_B |
|
|
New listing on M&E |
1 |
COGULD03a_B |
|
|
Retain on 4a List due to approved TMDL |
1 |
COSPUS14_B |
|
|
Retain on 4b List due to 4b Plan |
4 |
COSPMS01a_A; COSPUS15_B; COSPUS15_C; COSPUS15_D |
|
|
Dissolved Lead |
Delist from M&E |
13 |
COGULG07b_D; COGUSM02_B; COGUSM02_C; COGUSM03b_A; COGUSM04a_B; COGUUG04_B; COGUUN04c_A; COGUUN09_C; COSJSJ05_D; COSJSJ05_E; COSJSJ06a_C; COSJSJ06a_D; COSJSJ09a_A |
|
Delist from 303(d) |
1 |
COGUUG11_B |
|
|
Delist due to approved TMDL |
2 |
COARUA05_D; COARUA08b_A |
|
|
New listing on M&E |
8 |
COARUA05_B; COGUSM06b_A; COGUUN05_B; COGUUN05_D; CORGRG04b_B; CORGRG04b_C; CORGRG04b_D; CORGRG06_B |
|
|
Added to M&E due to database correction |
1 |
COSJLP04c_D |
|
|
Dissolved Lead |
M&E listing due to new segmentation |
2 |
COSJLP04c_C; COSJSJ06b_C |
|
Retain on M&E List |
10 |
COARUA05_C; COGUNF04b_B; COGUUN02_A; COGUUN19_A; COLCLC04b_A; COLCLC13a_B; CORGRG05_B; CORGRG07_A; CORGRG07_B; COSJAF03c_A |
|
|
Retain on 4a List due to approved TMDL |
20 |
COARUA01b_A; COARUA12a_A; CORGCB09a_A; CORGCB09a_B; COSJAF02_B; COSJAF03a_B; COSJAF03b_A; COSJAF06_B; COSJAF07_A; COSJAF08_A; COSPCL02a_A; COSPCL02b_B; COSPCL02c_C; COSPCL03b_A; COSPCL09b_A; COSPCL11_A; COSPSV04b_B; COSPUS02b_A; COUCBL06a_B; COUCBL07_A |
|
|
New listing on 303(d) |
6 |
COGUUG07_B; COGUUN05_C; COGUUN05_E; COGUUN07_A; COGUUN09_B; CORGRG04c_A |
|
|
Retain on 303(d) List |
10 |
COGUUG10a_A; COGUUG10b_A; CORGRG04a_A; COSPBO02a_C; COSPBT16_B; COSPCL09a_B; COSPCL12a_B; COSPCP07_B; COSPCP07_C; COSPRE01_A |
|
|
Total Lead |
New listing on M&E |
2 |
COARFO01a_B; COARFO02a_A |
|
pH |
Delist from M&E |
4 |
CORGAL02_B; CORGAL02_C; COSJPI05a_B; COSJSJ08_B |
|
Delist from 303(d) |
1 |
COGUNF09_B |
|
|
New listing on M&E |
2 |
COGUUG31_A; CORGAL07_A |
|
|
Retain on M&E List |
14 |
COGULG04a_E; COGUSM07_C; COGUUG10b_A; CORGAL13_A; CORGAL25_B; CORGAL30_A; CORGRG05_B; CORGRG38_B; COSPCL12a_B; COSPCP09_A; COSPCP12_A; COSPLA02a_A; COSPUS01a_B; COSPUS11a_A |
|
|
Retain on 4a List due to approved TMDL |
18 |
COARUA11_A; COARUA12a_A; CORGAL03a_A; CORGAL03b_A; CORGAL03b_B; CORGAL03c_A; CORGAL03d_A; CORGAL05_A; COSJAF04a_A; COSJAF09_A; COSPBO04a_B; COSPMS04_A; COSPMS04_B; COSPSV04a_A; COSPSV04a_B; COSPSV04b_B; |
|
|
pH |
COUCBL06a_B; COUCBL07_A |
||
|
New listing on 303(d) |
2 |
COGUUN02_A; COGUUN03a_A |
|
|
Moved from M&E to 303(d) |
3 |
COGULG15_B; COGUUN07_A; COSJPI08_A |
|
|
Retain on 303(d) List |
23 |
COARUA10_A; COGUSM02_D; COGUUG29a_B; COLCWH11_B; CORGAL20_A; COSPBO10_A; COSPBT02_B; COSPCL09b_A; COSPLS03_D; COSPMS07_B; COSPMS07_C; COSPSV05_B; COSPUS03_B; COSPUS04_C; COSPUS04_E; COSPUS05b_B; COSPUS17a_B; COSPUS17a_C; COSPUS17a_E; COSPUS17a_F; COSPUS23_F; COSPUS23_G; COUCNP09_D |
|
|
Dissolved Selenium |
Delist from M&E |
5 |
COGULG07a_A; COGUSM12a_F; COGUUN11_H; COGUUN11_J; CORGAL03b_B |
|
Delist from 303(d) |
1 |
COGULG16_C |
|
|
Delist due to new segmentation |
1 |
COLCLC19_C |
|
|
New listing on M&E |
3 |
COARLA09a_C; COARUA20b_A; COGUUN04a_B |
|
|
Moved from 303(d) to M&E |
1 |
COARFO04_B |
|
|
Retain on M&E List |
18 |
COARFO04_G; COGULD03a_B; COGULG16_B; COGULG16_D; COGUNF04b_B; COGUNF06a_B;COGUUN10a_B; COLCLC03_A; COLCLC04e_A; COLCLC13a_B; COLCLY03c_B; COLCLY03e_A; COSPLS03_C; COSPRE05_A; COSPUS01b_C; COSPUS07_B; COUCEA10a_B; COUCYA13j_A |
|
|
Delist due to approved TMDL |
1 |
COARMA18a_A |
|
|
Retain on 4a List due to approved TMDL |
31 |
COGULG01_C; COGULG02_A; COGULG02_B; COGULG04a_B; COGULG04a_B; COGULG04a_C; COGULG04a_C; COGULG04a_D; COGULG04a_D; COGULG04a_E; |
|
|
Dissolved Selenium |
COGULG04a_E; COGULG04a_F; COGULG04a_I; COGULG04a_I; COGULG04b_B; COGULG04b_B; COGULG04c_A; COGULG04c_A; COGUNF03_C; COGUNF05a_C; COGUNF05b_B; COGUNF06b_B; COGUNF06b_D; COGUNF06b_E; COGUNF06b_F; COGUUN04b_A; COGUUN04c_A; COGUUN12_C; COGUUN12_D; COGUUN12_E; COGUUN12_F |
||
|
New listing on 303(d) |
5 |
COARFO04_E; COARMA02_A; COARMA02_B; COARMA09_A; COGUNF06b_A |
|
|
Retain on 303(d) List Retain on 303(d) List |
51 51 |
COARLA01b_A; COARLA01c_A; COARLA04a_A; COARLA04a_B; COARLA09a_A; COARLA09a_B; COARLA09b_A; COARLA09b_B; COARLA10_B; COARLA10_C; COARLA11_A; COARLA12_A; COARLA12_B; COARMA03_A; COARMA10_A; COARMA12_A; COGULG07b_C; COGUUG29a_B; COGUUN20_A; COLCLC02b_B; COLCLC04a_A; COLCLC04a_B; COLCLC04a_C; COLCLC04a_D; COLCLC13b_A; COLCLC13b_B; COLCLC13b_C; COLCLC13b_D; COLCLC14c_B; COLCLC19_B; COLCLY03c_C; COLCWH09d_A; COSJLP08_B; COSPBO07b_B; COSPBO08_B; COSPBT04b_A; COSPBT05_A; COSPBT09_A; COSPCH04a_B; COSPCH04b_B; COSPCL12a_B; COSPCP13b_A; COSPLS01_A; COSPLS02b_B; COSPLS03_B; COSPSV06_B; COSPUS16a_A; COSPUS16c_A; COUCUC07a_B; COUCYA13e_B; COUCYA13h_A |
|
|
Sediment |
Delist from M&E |
4 |
COSJPI06c_A; COUCEA09a_A; COUCEA09b_B; COUCEA09b_C |
|
Delist from 303(d) |
1 |
COUCEA09a_B |
|
|
Delist due to extent of impairment refined |
3 |
COSJPI06a_C; COSJPI06a_G; COUCEA06_H |
|
|
Sediment |
Delist due to approved TMDL |
1 |
COUCBL18_B |
|
Retain on M&E List |
19 |
COARLA07_A; COGULG02_A; COGULG02_B; COGULG11b_B; COGUUN04a_B; COGUUN04a_C; COGUUN04b_A; COGUUN04c_A; COGUUN15b_A; COLCLC01_A; COLCLC01_B; COLCLC02a_A; COLCLC02b_A; COLCLC02b_B; COLCLY16_A; CORGRG13_A; COSJPI06a_E; COUCYA13b_A; COUCYA13b_B |
|
|
Retain on 4a List due to approved TMDL |
6 |
COGUSM03b_A; COSJLP04a_D; COSPCP07_C; COSPUS01a_A; COSPUS01a_C; COSPUS01a_E |
|
|
New listing on 303(d) |
1 |
CORGRG09_C |
|
|
Retain on 303(d) List |
13 |
COLCLC13b_B; COLCWH13b_A; COLCWH13b_B; COLCWH13b_C; COLCWH13b_D; COLCWH22_B; COLCWH23_B; CORGCB12a_B; COSPCL14b_A; COSPCL15_A; COUCEA06_G; COUCNP04a_I; COUCYA03_B |
|
|
Sulfate |
Delist from M&E |
10 |
COARMA06a_A; COARMA06b_A; COGULG04a_B; COGULG04b_B; COGUUN10a_C; COGUUN11_E; COSJPI06a_C; COSJPI06a_E; COSJPI06a_G; COSJPI06c_A |
|
Delist from 303(d) |
1 |
COGUNF05b_B |
|
|
New listing on M&E |
5 |
COARFO04_E; COGULD03a_B; COGULG12_B; COGUUN04a_B; COSJLP05_B |
|
|
Retain on M&E List |
17 |
COARLA09a_B; COARLA09b_A; COARLA09b_B; COGULG04a_F; COLCLC02b_B; COLCLC04a_A; COLCLC04a_B; COLCLC04a_C; COLCLC04a_D; COLCLC10_B; COLCLY03e_A; COLCLY06_A; COLCWH09b_A; COLCWH13b_C; COSPCL06_C; COSPCL12a_B; COSPLS01_A |
|
|
New listing on 303(d) |
8 |
COARLA01a_A; COGULG02_A; COGULG02_B; COGULG07b_C; COSJLP08_A; COSJLP08_B; COSJLP08_C; COSJLP08_E |
|
|
Moved from M&E to 303(d) |
4 |
COARLA02a_A; COARMA18a_A; COGULG04a_C; COGUNF06b_B |
|
|
Retain on 303(d) List |
9 |
COARLA04a_A; COARLA04a_B; COGULG04a_D; COGUNF06b_C; COLCLY03c_B; COLCLY03c_C; COSPBT08_B; COSPCP13a_B; COUCUC07a_B |
|
|
Temperature |
Delist from M&E |
16 |
COARMA07b_A; COGULG08a_A; COGULG08b_A; COGUSM12b_C; COGUSM12b_D; COGUSM12b_F; COGUSM12c_A; CORGCB12a_C; COSJLP04c_C; COSJLP04c_D; COSJPI05a_A; COSJPI05a_B; COSJPI05b_A; COSJSJ06a_C; COSJSJ06b_B; COSJSJ06b_C |
|
Delist from 303(d) |
5 |
COGULD02_D; COGULD02_E; COGUSM10b_B; COGUSM12b_G COGUSM12b_H |
|
|
Delist due to extent of impairment refined |
2 |
CORGCB12a_B; CORGCB12a_E |
|
|
Moved from 303(d) to M&E |
2 |
COGULD02_B; COGULD02_C; |
|
|
New listing on M&E |
15 |
COARFO02a_A; COARLA01a_A; COARLA01c_A; COARLA09b_A; COARLA09b_B; COARUA14c_B; COARUA15_B; COGUNF04b_C; COGUSM03b_A; COGUSM14_B; COGUUG02_D; COGUUG09_C; COGUUG23_A; COGUUG23_B; COGUUN11_G |
|
|
Retain on M&E List |
27 |
COARLA05b_A; COARLA05b_B; COARLA06a_C; COARLA06a_D; COARLA06b_A; COARUA04a_A; COLCLC04a_A; COLCLC04a_B; COLCLC04a_C; COLCLC04a_D; CORGAL11b_A; CORGCB12a_D; COSJSJ10_A; COSPBE06a_B; COSPBE06b_A; COSPBT08_A; COSPBT08_B; COSPCL14b_A; COSPCL17b_A; COSPUS02a_B; COSPUS03_B; COSPUS10a_D; COSPUS15_B; COSPUS15_C; COSPUS15_D; COSPUS16g_A; COUCYA13e_A |
|
|
New listing on 303(d) |
8 |
COARFO02b_A; COARLA01b_A; COARMA26_C; COGUNF03_B; COGUNF03_C; COGUUG18b_A; |
|
|
Temperature |
COGUUN03e_B; COGUUN03e_C |
||
|
Retain on 303(d) List |
45 |
COARFO06_B; COARFO06_C; COARLA03a_A; COARMA02_A; COARMA02_B; COGUUG08_A; COLCLC01_A; COLCLC01_B; COLCWH07_A; COLCWH07_B; COLCWH13c_B; COLCWH15_C; COLCWH23_A; COLCWH23_B; COLCWH23_C; CORGRG04b_B; CORGRG04b_C; CORGRG04b_D; COSPBE01a_B; COSPBE01b_A; COSPBE01e_A; COSPBE01e_B; COSPBE03_B; COSPBT02_D; COSPCL11_A; COSPCL13b_B; COSPCL14a_A; COSPCL14a_B; COSPCL15_A; COSPCP10a_A; COSPSV02b_A; COSPSV02b_B; COSPUS03_H; COUCBL17_B; COUCRF03c_A; COUCUC02_B; COUCUC02_C; COUCUC03_C; COUCUC03_D; COUCUC03_E; COUCUC07a_C; COUCUC07b_B; COUCUC07b_C; COUCUC10a_B; COUCYA02b_A |
|
|
Total Phosphorus |
Delist from M&E |
8 |
CORGCB02a_C; CORGCB02b_B; CORGCB12a_C; CORGRG11_A; CORGRG19_A; CORGRG20a_B; CORGRG20a_C; CORGRG20b_A |
|
Delist due to extent of impairment refined |
2 |
CORGCB12a_B; CORGCB12a_E |
|
|
New listing on M&E |
1 |
COARUA14d_B |
|
|
Retain on M&E List |
7 |
COLCLC04a_A; COLCLC04a_B; COLCLC04a_C; COLCLC04a_D; CORGCB02a_B; CORGCB02c_A; CORGCB12a_D |
|
|
Moved from M&E to 303(d) |
1 |
COARUA35_A |
|
|
Retain on 303(d) List |
1 |
COSPBE01c_A |
|
|
Total Uranium |
New listing on M&E |
1 |
COARLA09a_B |
|
Retain on M&E List |
1 |
COARFO01a_B |
|
|
Delist due to approved TMDL |
1 |
COARMA18a_A |
|
|
Retain on 303(d) List |
2 |
COARLA01c_A; COSPLS01_A |
|
|
Zinc (sculpin) |
Retain on 4a List due to approved TMDL |
1 |
COGUUN06a_A |
|
Dissolved Zinc |
Delist from M&E |
1 |
COSJPI08_A |
|
Delist from 303(d) |
4 |
COARMA18a_A; COGULG15_B; COGUNF09_B; COGUSM02_B |
|
|
Delist due to approved TMDL |
1 |
COARUA02c_A |
|
|
New listing on M&E |
3 |
CORGRG06_B; COSJAF03a_A; COSJAF03a_B |
|
|
Retain on M&E List |
15 |
COGUNF07_B; COGUUG29a_C; COGUUG29a_D; COGUUG29a_E; COGUUN19_A; COLCLY07_A; CORGAL20_A; CORGCB12a_C; CORGRG05_B; CORGRG07_A; CORGRG07_B; COSJAF22_B; COSPCL06_C; COUCBL04a_C; COUCYA08_C |
|
|
Retain on 4a List due to approved TMDL |
58 |
COARUA01b_A; COARUA02a_A; COARUA02b_A; COARUA03_A; COARUA04a_A; COARUA04b_A; COARUA07_A; COARUA08b_A; COARUA11_A; COARUA12a_A; COGUSM03a_A; COGUSM03b_A; COGUSM06a_A; COGUSM06b_A; COGUUG30_B; COGUUG31_A; COGUUN02_A; CORGAL03a_A; CORGAL03b_A; CORGAL03b_B; CORGAL03c_A; CORGAL03d_A; CORGCB09b_A; CORGCB09b_B; CORGRG04a_A; CORGRG04b_B; CORGRG04b_C; CORGRG04b_D; COSJAF04a_A; COSJAF04b_A; COSJAF05a_B; COSJAF09_A; COSJDO09_A; COSPBO04a_B; COSPCL02a_A; COSPCL02c_C; COSPCL03a_A; COSPCL03a_B; COSPCL03a_C; COSPCL03b_A; COSPCL09b_A; COSPCL11_A; COSPCL13b_A; COSPCL13b_B; COSPSV04a_A; COSPSV04a_B; COSPSV04b_B; COSPUS02b_A; COSPUS02c_C; COSPUS02c_D; COSPUS05a_A; COSPUS05b_A; COSPUS05b_B; COUCBL07_A; COUCEA05a_A; COUCEA05b_A; COUCEA05c_A; COUCEA07b_A |
|
|
Dissolved Zinc |
New listing on 303(d) |
10 |
COARFO01b_A; COARUA05_A; COGUNF04c_A; COGUUN03a_A; COGUUN05_B; COGUUN05_C; COGUUN05_E; COGUUN07_A; COGUUN09_C; CORGRG04c_A |
|
Moved from M&E to 303(d) |
1 |
COGUUN08_A |
|
|
Retain on 303(d) List |
27 |
COARUA05_B; COARUA05_C; COGUUG07_B; COGUUG08_A; COGUUG10a_A; COGUUG10b_A; COGUUG11_B; COGUUG11_D; COGUUG12_C; COGUUG29a_B; COGUUN09_B; COGUUN09_D; CORGRG09_B; COSJAF03c_A; COSPCL02b_B; COSPCL02b_C; COSPCL02c_B; COSPCL12a_A; COSPCL12a_B; COSPUS02c_A; COUCBL02a_B; COUCBL04a_B; COUCBL06a_B; COUCBL06a_C; COUCBL12_B; COUCBL12_C; COUCYA03_E |
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Eagle River Water and Sanitation District proposed that a portion of the Eagle River from Berry Creek to Squaw Creek be removed from the 303(d) List for a few reasons. In this portion, the gradient of the Eagle River flattens and as flow velocities decrease the river channel and floodplain broaden. Under the Sediment Policy 98-1, Sediment Region 3 for mid-elevation mountain streams include slopes that range from 0.4% to 10%, with percent fines that range from 9% to 41%. The questionable area for this portion has a slope of 0.12 %, which is below the range of slopes used to establish the expected condition of Sediment Region 3. The portion of Segment 9a above the deposition zone (Segment 9a from Gore Creek to Berry Creek), and Segment 9b downstream of the deposition zone (Squaw Creek to Rube Creek), have stream slopes within the slope ranges for Sediment Region 3 and attain the TIVSED and percent fines for Sediment Region 3. Therefore the increased sediment is limited to the low gradient depositional zone. The division recommended not to use the thresholds in Sediment Region 3 for the lower slope depositional zone and therefore based on data upstream and downstream that show attainment, the commission decided to remove segment COUCEA09a_B from the 303(d) List as impaired for sediment.
The division proposed that the Dolores River from Big Gypsum Creek to the San Miguel River (COGULD02) be placed on the 303(d) List due to exceedances in the aquatic life use based temperature standards. The Dolores Water Conservancy District (DWCD) raised an issue regarding whether the cause of the temperature impairment had been considered and whether the waterbody should be placed into Category 4c instead of the 303(d) List. When reviewing the topic of Category 4c in the 2018 Listing Methodology, some inconsistent language was noticed between Regulation #93 and the 2018 Listing Methodology. The introduction in Regulation #93 states that "Water bodies that are impaired, but it is unclear whether the cause of impairment is attributable to pollutants as opposed to pollution, are also placed on the Monitoring and Evaluation List." The 2018 303(d) Listing Methodology states that "Before placing impaired waterbody segments into Category 4c, thorough monitoring and assessment needs to be performed on the segment to confirm that no pollutants are contributing to the waterbody's failure to meet water quality standards. If adequate monitoring and assessment is not performed to rule out pollutant(s) as a cause, then the impaired waterbody should be placed on the 303(d) List (Category 5)".
The most recent policy decisions that relate to impairment decisions for temperature are reflected in the Listing Methodology and not Regulation #93. However, the division recognizes that where there is a conflict between the regulation and the listing methodology, the language in the regulation would prevail and must be followed. Therefore the commission placed segment COGULD02 on the M&E List for temperature until 2020 when the language in the regulation can be changed to better reflect recent policy decisions. The inconsistency was not noticed until after the submittal of the responsive prehearing statement by DWCD and therefore the division could not propose a change to the regulation as it would be outside of the scope of this rulemaking hearing.
The commission adopted an alternative methodology for assessing ambient based water quality standards in the 2016 Listing Methodology (Appendix B). This assessment methodology incorporates confidence intervals into the assessment of ambient standards. The confidence interval is a more statistically sound approach in determining impairments in situations when an impairment is slightly above the standard because it takes into account the "normal variability in the available concentration of the data" (Appendix B, 2018 LM).
For segment COSJAF09 (Mineral Creek), the 85th percentiles of dissolved manganese and dissolved iron were exceeding the standard, that was based on the ambient conditions of the stream from the year 2000. The Animas River Stakeholder Group proposed to re-assess both dissolved manganese and iron using the ambient-based approach to determine the level of confidence that the parameters were exceeding the standards. Based on the information provided by the Animas River Stakeholders Group, using the confidence interval approach, both dissolved manganese and iron are attaining standards. The commission concluded that dissolved iron, dissolved manganese and sulfate water supply standards based on 2000 conditions are in essence, ambient standards and should be assessed as such. The commission did not include Mineral Creek on the 303(d) list for manganese and iron.
The second paragraph in § III.B.7 of the 2018 Listing Methodology states that data collected during or immediately after temporary events influencing the waterbody that are not representative of normal conditions shall typically be discounted in making the listing decision. For example, scouring storm flows which lead to diminished aquatic life use or accidental spills of toxic chemicals would not be a basis upon which to list the affected segment. However, such events may be considered as a basis for listing in instances where nonattainment of standards arises from a reversible source of pollutants.
The commission maintains that storms are a normal part of the hydrologic cycle. If samples collected during a storm event are obtained using established procedures and analyzed using standard methods, those results are representative of conditions within the stream at that time.
The commission acknowledges that changes in the volume of stream flow, such as those caused by precipitation events, can affect water quality indicators. However, assessment procedures are in place to deal with the variation, including those values that might be perceived as outliers within the data set. These procedures include bias removal, the averaging of daily and weekly samples, the use of percentiles to determine ambient concentrations for total and dissolved constituents, and the calculation of the geometric mean for the observed E. coli concentrations. In the latter case, the geometric mean is a statistical description of the central tendency of a set of results and serves to mute the effect of outliers.
The commission concluded that not all high flow events can be automatically considered to be either a substantial storm or scouring event. If such instances are known to exist, then the associated data would be removed. However, a blanket removal of such data should not be expected.
The commission requested that in the next listing methodology work group, that the division further explore the listing of "all tributary" segments, particularly for E.coli, and also consider what happens to "all tributary" segments that are on the 303(d) list when they are resegmented.
PARTIES TO THE RULEMAKING
