Code of Colorado Regulations
1000 - Department of Public Health and Environment
1002 - Water Quality Control Commission (1002 Series)
5 CCR 1002-34 - REGULATION NO. 34 - CLASSIFICATIONS AND NUMERIC STANDARDS FOR SAN JUAN AND DOLORES RIVER BASINS
Section 5 CCR 1002-34.55 - STATEMENT OF BASIS, SPECIFIC STATUTORY AUTHORITY AND PURPOSE; JUNE 13-14, 2022 RULEMAKING; FINAL ACTION AUGUST 8, 2022; EFFECTIVE DATE SEPTEMBER 30, 2022
Current through Register Vol. 47, No. 17, September 10, 2024
The provisions of C.R.S. 25-8-202(1)(a), (b) and (2); 25-8-203; 25-8-204; and 25-8-402; 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. Waterbody Segmentation
Some segments were renumbered, combined, or new segments were created to facilitate appropriate organization of water bodies in this regulation. Renumbering and/or creation of new segments was made based on information that showed:
San Juan segments 4 and 5 (COSJSJ04 and COSJSJ05): Portions of Fall Creek (from its source to the irrigation diversion just upstream from the confluence with Wolf Creek), Wolf Creek (from the boundary of the Weminuche Wilderness area to the confluence with Fall Creek), and Quartz Creek (from the boundary of the South San Juan Wilderness area to the boundary of the San Juan National Forest), including their tributaries and wetlands, were moved from Segment 5 to Segment 4. The move facilitated changing the antidegradation designation of these waterbodies from Reviewable to Outstanding Waters. As part of this change, Segment 5 was revised to exclude listings in Segment 4.
Animas and Florida segments 1, 6, 12a, and 12c (COSJAF01, COSJAF06, COSJAF012a, and COSJAF12c): To facilitate changing the antidegradation designation from Reviewable to Outstanding Waters on several waterbodies previously included in segments 6 and 12a, multiple segment descriptions were modified, as discussed in more detail below.
Bear Creek and a portion of Boulder Creek (from its source to the downstream public land boundary), including their tributaries and wetlands, were moved from Segment 6 to Segment 12c. The move facilitated changing the antidegradation designation of these waterbodies from Reviewable to Outstanding Waters. As part of this change, Segment 6 was revised to exclude listings in Segment 12c.
The mainstem of Cascade Creek, including tributaries and wetlands, from its source to the Tacoma diversion was also moved to Segment 12c from Segment 12a to facilitate changing the antidegradation designation of this waterbody from Reviewable to Outstanding Waters. The description for Segment 12a already contains an exclusion for Segment 12c, so no changes to the description for Segment 12a were needed to accommodate this segmentation change.
Grasshopper Creek and Lime Creek, including their tributaries and wetlands, were moved from Segment 12a to Segment 1. The move facilitated changing the antidegradation designation of these waterbodies from Reviewable to Outstanding Waters. As part of this change, the description for Segment 12a was revised to exclude listings in Segment 1.
Animas Florida Segments 8a and 8b (COSJAF08a and COSJAF08b): Segment 8 was split into segments 8a and 8b to facilitate changes to the Aquatic Life use classification and standards for a portion of Mineral Creek. The original reaches in Segment 8 were retained in Segment 8a, with the exception of the portion of Mineral Creek from a point immediately below the confluence with Mill Creek to a point immediately above the confluence with Middle Fork of Mineral Creek, which was moved to new Segment 8b. As part of this change, exceptions for Segments 8a and 8b were also added to the segment description of Segment 6.
Dolores segments 1, 2, 5a, 5b, 6, and 7 (COSJDO01, COSJDO02, COSJDO05a, COSJDO06, and COSJDO07): To facilitate changing the antidegradation designation from Reviewable to Outstanding Waters on several waterbodies previously included in segments 2, 5a, 6, and 7, multiple segment descriptions were modified, as discussed in more detail below.
A portion of the mainstem of the Dolores River, including tributaries and wetlands, from its source to below the confluence with Snow Spur Creek, was moved from Segment 2 to Segment 5b. Inclusion of "Mainstem of the Dolores River, including tributaries and wetlands, from the source to a point immediately below the confluence with Snow Spur Creek, except for the listings in Segment 1" in Segment 5b also facilitates the move of Snow Spur Creek from Segment 5a to Segment 5b. These changes were made to facilitate changing the antidegradation designation of these waterbodies from Reviewable to Outstanding Waters.
Portions of Bear, Priest, Wildcat, and Stoner Creek, including tributaries and wetlands, from their sources to the downstream San Juan National Forest boundary, were also moved from Segment 5a to Segment 5b to facilitate changing the antidegradation designation of these waterbodies from Reviewable to Outstanding Waters. The description for Segment 5a already contains an exclusion for Segment 5b, so no changes to the description for Segment 5a were needed to accommodate this segmentation change.
Portions of Slate Creek and Coal Creek, including tributaries and wetlands, from the boundary of the Lizard Head Wilderness Area to their confluences with the Dolores River, were moved from Segments 6 and 7, respectively, to Segment 1 to facilitate changing the antidegradation designation of these waterbodies from Reviewable to Outstanding Waters. This move resulted in the deletion of Segment 7, which previously contained only the portion of Coal Creek that was moved to Segment 1.
B. Temporary Modifications
Pursuant to the requirements in the Basic Standards (at 31.7(3)), all existing temporary modifications were examined to determine whether they should be deleted, modified, extended, or left unchanged.
The commission allowed to expire on 12/31/2022 temporary modifications on the following segments:
Animas and Florida River: 3b (COSJAF03b; acute and chronic copper), 4a (COSJAF04a; acute and chronic copper)
The Town of Silverton expects to be able to complete repairs to its collections system and minor treatment facility improvements in 2022 and 2023, which the town anticipates will allow it to come into compliance with its copper WQBELs. This will also resolve the uncertainty pertaining to the extent to which the town's effluent contributions to the ambient copper concentrations are reversible. Therefore, these temporary modifications are no longer justified.
To remain consistent with the commission's decisions regarding arsenic in section 35.47 , all existing temporary modifications for arsenic of "As(ch)=hybrid" (expiration date of 12/31/24), with the exception of those listed below, were retained.
The division submitted a plan to resolve uncertainty in the 2019 Temporary Modifications rulemaking. The division plans to propose revised standards for arsenic as soon as possible following updated toxicological information from EPA's Integrated Risk Information System (IRIS) and completion of ongoing studies to better understand arsenic conditions in Colorado. Furthermore, per the conditions of the revised and extended temporary modification at 35.6(2)(c) (effective 6/30/2020 and expires 12/31/2024), and based on the widespread need to make progress to understand sources of arsenic and set forth processes for lowering arsenic in discharges, additional permit Terms and Conditions (T&Cs) are being implemented for facilities benefitting from the "current condition" temporary modification. These T&Cs may include requirements for additional monitoring, source identification, and characterization of source control and treatment options for reducing arsenic concentrations in effluent. The commission recognizes the need to resolve the uncertainty in the arsenic standards and ensure that human health is adequately protected.
Where evidence indicated the requirements to qualify for a temporary modification were not met, temporary modifications were deleted. The commission deleted chronic arsenic temporary modifications (expiring 12/31/2024) on several segments due to a lack of evidence of a demonstrated or predicted water quality-based effluent limit compliance problem for these segments. These segments have all been designated as Outstanding Waters, have no CDPS permitted dischargers with WQBELs for arsenic, and are headwaters (i.e., no dischargers on upstream segments, who may receive WQBELs based on protection of downstream uses). Temporary modifications for arsenic were deleted from the following segments:
San Juan River: 4 (COSJSJ04)
Piedra River: 1 (COSJPI01)
Los Pinos River: 1 (COSJPN01)
Dolores River: 1 and 5b (COSJDO01 and COSJDO05b)
C. Site-specific Standards
Site-specific criteria-based standards are adopted where alternate criteria are shown to be protective of the classified uses. Site-specific ambient-based standards are adopted where natural or irreversible human-induced conditions result in pollutant concentrations that exceed table value standards. Feasibility-based ambient standards are adopted where water quality can be improved, but not to the level required by the current numeric standard. Information is currently being gathered to better understand the basis of all existing site-specific standards and determine what information is needed to review each standard in future basin reviews. The commission made no revisions to any site-specific standards at this time.
D. Discharger-specific Variances
The commission reviewed the basis, available information, and progress toward achieving the alternative effluent limits (AELs) and implementing Pollutant Minimization Programs (PMPs) for the three discharger-specific variances (DSVs) in Regulation No. 34.
Animas and Florida River Segment13c (COSJAF13c): There is currently a DSV for acute and chronic ammonia, which applies to Durango West Metro District #2 (expires 12/31/2024). The original PMP for Durango West was included in the division's Exhibit 4 (Table 7) in the August 2014 Regulation No. 34 DSV rulemaking hearing. The commission revised the PMP and the amended PMP is included in the division's Prehearing Statement (page 7).
La Plata River Segment 7a (COSJLP07a): There is currently a DSV for acute and chronic ammonia, which applies to Vista Verde Village, LLC (expires 6/30/2031). The PMP for Vista Verde Village was included in the division's Rebuttal Exhibit A-7 in the December 2020 Regulation No. 34 DSV rulemaking hearing.
La Plata River Segment 10 (COSJLP10): There is currently a DSV for acute and chronic ammonia, which applies to the Town of Dove Creek (expires 6/30/2025). The PMP for the Town of Dove Creek was included in the division's Rebuttal Exhibit B-7 in the December 2020 Regulation No. 34 DSV rulemaking hearing.
The commission determined that these dischargers continue to make progress on the plans set forth in their PMPs as part of their DSVs and that the adopted AELs continue to represent the highest attainable water quality that is feasible for these dischargers to achieve. Therefore, the commission determined that the DSVs are still appropriate and do not require revision at this time. The commission expects that the dischargers will submit annual reports to the division describing the progress made on PMP implementation until the end of the DSVs.
The commission added details to Section 34.6 for the Durango West DSV, including notation of the interim (25 mg/L [starting 1/1/2017]) and final (15 mg/L [starting 1/1/2019]) ammonia (acute/chronic) AELs, as well as the adoption and expiration dates of the DSV.
The commission adopted non-substantive revisions to the format of these DSVs in Section 34.6 and the Appendix 34-1 tables to provide clarity and consistency. General DSV implementation information previously noted for the Durango West DSV was removed because it was not unique to that particular DSV and general implementation guidance for DSVs can be found in Regulation No. 31 at 31.7(4). In addition, the acronym "AEL" was defined at 34.6(2)(a).
E. Aquatic Life Use Classifications and Standards
Animas Florida Segment 8b (COSJAF08b): Based on evidence provided by the Bonita Peak Community Advisory Group (CAG), an Aquatic Life Cold 1 use classification and standards were added to new Segment 8b (COSJAF08b). Over the last twenty-five years, remediation of historical mine sites in the upper reaches of Mineral Creek has substantially improved water quality in the drainage to such a degree that a portion of Mineral Creek (new Segment 8b) now supports aquatic life, including brook trout and macroinvertebrate communities that are better than the Multi-Metric Index attainment thresholds presented in WQCC Policy 10-1. As such, new Segment 8b is capable of supporting a wide variety of biota, including sensitive species.
Based on water quality and biological data and information presented in this hearing (CAG Prehearing Statement Exhibits D, E, and G1-G4 and Rebuttal Exhibits S, T, U, and V), the commission resegmented Segment 8 into 8a (COSJAF08a) and 8b (COSJAF08b). New Segment 8b contains the portion of Mineral Creek from below Mill Creek to above the Middle Fork of Mineral Creek. The rest of the segment was retained in Segment 8a, for which the use classifications and water quality standards remain unchanged from the parent Segment 8.
For Segment 8b, the commission adopted an Aquatic Life Cold 1 use per 31.13(1)(c), and in accordance with 31.7(1)(b), table value water quality standards to protect the Aquatic Life use. Thallium standards to protect the Fish Ingestion and Aquatic Life uses, which are adopted on a site-specific basis, were also adopted on Segment 8b due to the documented presence of this Clean Water Act Section 307 priority pollutant in the segment. The commission declined to adopt aluminum standards to protect aquatic life on Segment 8b at this time. As discussed at 34.55(G), EPA released updated 304(a) Aquatic Life criteria for aluminum in 2018, but has not released finalized implementation guidance. Studies are currently underway to improve understanding of these criteria in the context of water quality conditions in Colorado and how these criteria may be adopted and implemented in Colorado in the future.
The commission acknowledges that the table value standards for chronic and acute copper, chronic lead, chronic cadmium, and chronic and acute zinc are not currently attained during spring runoff (April-June), and that the chronic and acute zinc table value standards may not be attainable throughout the year. The commission also acknowledges that information suggests that some portion of the concentrations for these parameters may be natural or infeasible to clean up to the level of table value standards. However, at this time, the comprehensive analysis and review required at 31.7(1)(b)(ii) to develop ambient quality-based site-specific standards is not available. Therefore, the commission adopted table value standards to protect the Aquatic Life Cold 1 use classification and the highest attainable use, as per 31.6, 31.7(1)(b), and 31.13(1)(c).
There are no practical implications of the new table value standards for permitted facilities, because no permitted discharges exist within or upstream of Segment 8b. Though the segment would be subject to review for 303d listing, when developing future priorities for development of total maximum daily loads (TMDLs), the division will consider 1) the significant water quality improvement achieved to date and the completed restoration work in this watershed and 2) progress toward the development of site-specific standards, to ensure that division and stakeholder resources are expended appropriately. Finally, this action is not expected to restrict options for future Superfund remedial actions, based on the flexibilities afforded at 31.11(5) and under CERCLA (e.g., CERCLA Section 121(d)(4)) to consider site-specific conditions, as appropriate. It is the commission's understanding that interested parties and stakeholders, including EPA Superfund staff, the Colorado Hazardous Materials and Waste Management Division, and the CAG, will continue to evaluate the appropriateness and necessity of developing site-specific standards for this segment. If sufficient information becomes available to support feasibility-based ambient standards or site-specific criteria-based standards (per 31.7(1)(b)(ii) or 31.7(1)(b)(iii), respectively), adoption of site-specific standards for this segment may be considered by the commission.
It is not the commission's intention for the table value standards to drive cleanup measures of sources of water for the ecologically-rare Chattanooga iron fens alongside of Segment 8b (CAG Prehearing Statement Exhibit P), without consideration of how cleanup may affect the fens. One of those sources is discharge from an abandoned mine, commonly known as the Ferrocrete Mine (37.86810827, -107.7266958), that is not a major source of copper, lead, cadmium, and zinc to the segment. This mine has not been designated as part of Bonita Peak Mining District Superfund Site.
F. Standards to Protect the Aquatic Life, Recreation, Water Supply, and Agriculture Uses
The commission reviewed the standards applied to each segment to determine if the standards are consistent with the uses. Some segments assigned an Aquatic Life, Recreation, Water Supply, and/or Agriculture use classification were missing one or more standards to protect that use. The commission adopted the missing standards for the following segments:
Piedra River 6a (COSJPI06a): chronic iron and manganese standards to protect the Water Supply Use, which were inadvertently deleted in 2017, were adopted back onto this segment.
Los Pinos River 7a (COSJPN07a): chronic arsenic standard of 7.6 µg/L was changed to 0.02-10 µg/L to protect the Water Supply Use adopted on this segment in 2017.
G. Other Standards to Protect Aquatic Life and Recreation Uses
The commission declined to adopt EPA's revised 304(a) Aquatic Life criteria for selenium, ammonia, and aluminum at this time; however, the division is committed to evaluating these new criteria. Studies are currently underway for each parameter to improve understanding of these criteria in the context of water quality conditions in Colorado and how these criteria may be adopted and implemented in Colorado in the future.
EPA has also released updated criteria or guidance for several other parameters, including copper (Aquatic Life), E. coli (Recreation), cyanotoxins (Recreation), and the human health risk exposure assumptions. However, the division does not recommend adopting EPA's recommendations for these parameters at this time, as these items are not included on the division's 10-year water quality roadmap.
H. Antidegradation Designations: Outstanding Waters
The commission designated several segments or waterbodies as Outstanding Waters based on evidence provided by the Southwest Colorado Outstanding Waters Coalition (SCOWC) that satisfied the criteria for Outstanding Waters designation set forth in Section 31.8 . The SCOWC is a diverse coalition comprising American Rivers, American Whitewater, Conservation Colorado, High Country Conservation Advocates, San Juan Citizens Alliance, The Pew Charitable Trusts, Trout Unlimited/Colorado Trout Unlimited/Dolores River Anglers, and Western Resource Advocates, which have a common goal of safeguarding clean water in Colorado.
Specifically, evidence demonstrated the following conditions were met: 1. existing water quality for the 12 parameters specified at 31.8(2)(a)(i) is equal to or better than necessary to protect uses; 2. the waterbody is considered an outstanding natural resource (i.e. State Gold Medal Trout Fishery, a National Park, National Monument, National Wildlife Refuge, or a designated Wilderness Area, or is part of a designated wild river under the Federal Wild and Scenic Rivers Act, or has exceptional recreational or ecological significance and has not been substantially impacted by human activities) (31.8(2)(a)(ii)); and, 3. the waterbody needs protection in addition to the protections provided by uses, standards, and a Reviewable designation (31.8(2)(a)(iii)).
To further support the proposal, the SCOWC and stakeholders also provided information that demonstrates these waterbodies have important short- and long-term recreational and ecological value for the local communities. In addition, through the widespread outreach effort to interested and/or potentially impacted stakeholders conducted by the SCOWC, the commission determined that stakeholders supported the Outstanding Waters designations or, at a minimum, did not oppose the Outstanding Waters designations.
The Reviewable designation was upgraded to Outstanding Waters on the following segments or waterbodies:
* Fall Creek, including its tributaries and wetlands, from its source to the irrigation diversion just upstream from the confluence with Wolf Creek
* Wolf Creek, including its tributaries and wetlands, from the boundary of the Weminuche Wilderness to the confluence with Fall Creek
* Quartz Creek, including its tributaries and wetlands, from the boundary of the South San Juan Wilderness to the boundary of the San Juan National Forest
* Bear Creek (Animas), including its tributaries and wetlands
* Boulder Creek, including its tributaries and wetlands, from its source to the downstream public land boundary
* Cascade Creek, including its tributaries and wetlands, from its source to the Tacoma diversion
* Grasshopper Creek, including its tributaries and wetlands
* Lime Creek, including its tributaries and wetlands
* Dolores River, including its tributaries and wetlands, from its source to below Snow Spur Creek
* Snow Spur Creek, including its tributaries and wetlands
* Bear Creek (Dolores), including tributaries and wetlands, from its source to the downstream San Juan National Forest boundary
* Priest Creek, including tributaries and wetlands, from its source to the downstream San Juan National Forest boundary
* Wildcat Creek, including tributaries and wetlands, from its source to the downstream San Juan National Forest boundary
* Stoner Creek, including tributaries and wetlands, from its source to the downstream San Juan National Forest boundary
* Slate Creek, including tributaries and wetlands, below the Lizard Head Wilderness to the Dolores River
* Coal Creek, including tributaries and wetlands, below the Lizard Head Wilderness Area to the Dolores River
To meet the first requirement at 31.8(2)(a)(i), the SCOWC provided data (SCOWC Rebuttal Appendix 6) demonstrating that water quality in all of these waterbodies is equal to or better than the standards necessary to protect the uses for the 12 parameters specified at 31.8(2)(a)(i).
To meet the second requirement at 31.8(2)(a)(ii), the SCOWC provided evidence that each of these waterbodies is considered an outstanding natural resource. Where waterbodies were determined to be outstanding natural resources because they have exceptional recreational or ecological significance, per 31.8(2)(a)(ii)(B), the waters were shown to not be substantially impacted by human activities.
Several types of evidence were used to demonstrate that a waterbody is an outstanding natural resource because it has exceptional ecological significance, including information about fish populations, aquatic-dependent wildlife, the macroinvertebrate community, and/or the aquatic-dependent plant community.
* Fish: In addition to the evidence provided by the SCOWC, the commission relied on the expertise of Colorado Parks and Wildlife (CPW) staff for determining which waterbodies had fish populations with exceptional ecological significance. In general, CPW found a fish population to be exceptional if it supported a conservation population of cutthroat trout. Cutthroat trout are the only native trout to Colorado and conservation populations of this species are critical to reestablishing pure cutthroat populations in the state. Conservation populations of cutthroat trout are:
* Aquatic-dependent wildlife: Waterbodies supporting federally- or state-listed threatened or endangered species, such boreal toads, were found to have exceptional ecological significance.
* Macroinvertebrates: Waterbodies supporting benthic macroinvertebrate communities that were "high-scoring" per WQCC Policy 10-1 were found to have exceptional ecological significance.
* Aquatic-dependent plants: Waterbodies that support aquatic-dependent/riparian plant communities identified as "high", "very high", or "extremely high" biodiversity by the Colorado Natural Heritage Program were found to have exceptional ecological significance.
Additionally, as discussed below, some waterbodies supported some combination of exceptional fish, macroinvertebrates, and plants and/or exhibited exceptional recreational significance. The evidence used to meet the requirement at 31.8(2)(a)(ii) for each waterbody is summarized below.
San Juan Segment 4 (COSJSJ04): The SCOWC demonstrated that Fall Creek and Wolf Creek have exceptional ecological value because they support San Juan lineage cutthroat trout and high-scoring benthic macroinvertebrate communities.
The SCOWC demonstrated that Quartz Creek, whose headwaters originate in the South San Juan Wilderness Area, is ecologically exceptional because it supports high-scoring benthic macroinvertebrate communities and riparian plant species that are considered to be of "High Biodiversity Significance", based on the Colorado Natural Heritage Program (CNHP) Potential Conservation Area (PCA) report for Quartz Creek. Quartz Creek is also recreationally important because it is a priority for the San Juan National Forest's fisheries management program, providing unmatched cutthroat trout fishing (mixed lineage) in a pristine backcountry setting.
Animas and Florida segments 1 and 12c (COSJAF01 and COSJAF12c): The SCOWC demonstrated that Bear Creek (Animas) and Grasshopper Creek have exceptional ecological value because they support populations of Blue lineage (Colorado River) cutthroat trout. In addition, the Grasshopper Creek headwaters originate in the Weminuche Wilderness Area. While not directly relevant for an Outstanding Waters designation, Bear Creek and Boulder Creek, discussed below, are also some of the primary drinking water sources for the Town of Silverton.
The SCOWC demonstrated that Boulder Creek and upper Cascade Creek have exceptional ecological value because they support high-scoring benthic macroinvertebrate communities. Upper Cascade Creek provides important habitat for aquatic-dependent bird species, such as the American Dipper, and nesting sites have become priority study areas for the Durango-based American Dipper Project.
The SCOWC demonstrated that Lime Creek has exceptional ecological value because it supports riparian plant species that are considered to be of "High Biodiversity Significance", based on the Colorado Natural Heritage Program (CNHP) Potential Conservation Area (PCA) report for Lime Creek. In addition, Lime Creek flows along the western boundary of the Weminuche Wilderness Area.
Dolores segments 1 and 5b (COSJDO01 and COSJDO05b): The SCOWC demonstrated that a portion of the mainstem of the Dolores River (from its source to below the confluence with Snow Spur Creek) and Snow Spur Creek have exceptional ecological value because they support riparian and wetland plant species that are considered to be of "High Biodiversity Significance", based on the Colorado Natural Heritage Program (CNHP) Potential Conservation Area (PCA) report for Dolores River at Snow Spur.
The SCOWC demonstrated that Bear Creek (Dolores) has exceptional ecological value because it supports riparian plant species that are considered to be of "Very High Biodiversity Significance", based on the Colorado Natural Heritage Program (CNHP) Potential Conservation Area (PCA) report for Dolores River at Negro Draw, which is located at the confluence of Bear Creek and the Dolores River.
The SCOWC demonstrated that Priest, Wildcat, and Slate Creek have exceptional ecological value because they support populations of Green lineage (Colorado River) cutthroat trout. In addition, the Slate Creek headwaters originate in the Lizard Head Wilderness Area.
The SCOWC demonstrated that Stoner Creek has exceptional ecological value because it supports a population cutthroat trout like to be Green lineage (Colorado River) cutthroat trout.
The SCOWC demonstrated that Coal Creek has exceptional ecological value because it supports a population of Blue lineage (Colorado River) cutthroat trout. In addition, the Coal Creek headwaters originate in the Lizard Head Wilderness Area.
For all of these waterbodies, the SCOWC demonstrated that additional protection is needed due to preserve critical aquatic habitat, support downstream resiliency and ecosystem services, and provide recreational value. Potential threats to these waterbodies include climate change, drought, wildfire, and anthropogenic impacts from development and recreation.
The commission understands that there are existing land uses, including grazing permits, in place in many of these watersheds. The evidence demonstrates that these existing land uses are compatible with the Outstanding Waters designation, because the current high level of water quality has been attained with these uses in place. It is the commission's intent that these Outstanding Waters designations should not be the basis upon which federal, state or local agencies place more onerous or costly conditions upon permits or approvals existing at the time of the designation, or upon any renewals thereof.
I. Clarifications and Correction of Segmentation, Typographical, and Other Errors
The following edits were made to the regulation and Appendix 34-1 to improve clarity and correct typographical errors:
San Juan River: 5, 6b, 10, 11b, 11c
Piedra River: 3, 4a, 5a, 5b, 6c, 6d
Los Pinos River: 2c, 2d, 4, 5, 7a, 7b
Animas and Florida River: 6, 11c, 12a, 12c, 12d, 13a, 13b, 13c, 13d, 13e, 13f, 14a, 14b, 15
La Plata River: 3d, 3e, 4c, 5, 6a, 6b, 6c, 9
Dolores River: 5b, 6, 8, 9, 10a, 10b, 11a, 11c
""The aluminum standards for segments 3a, 4a and 9 have been specified as "total recoverable", since that sampling fraction correlates better with the principal aquatic life toxicity studies available than the dissolved fraction."
