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• AMMTOX Ammonia Model
  This is Version 2a of the Colorado Ammonia Toxicity Model used to compute total ammonia effluent limits in CDPS Permits. This model consists of two Excel spreadsheets. These spreadsheet do contain some macros that may interfere with downloading. For more information please call (303) 692-3608.

  • AMMTOX Background Manual

  • AMMTOX Operating Manual v2a

  • AMMTOX Reach Model v2a

  • AMMTOX Recur Model v2a
     

• Antidegredation Significance Determination Guidance V1.0 12-2001 and First Update April 2002

• Aquatic Pesticide Permitting.  Pending the effective date of the Sixth Circuit Court of Appeal's decision, the final aquatic pesticides rule remains in effect and permits are not required for the application of pesticide products in accordance with the product's Federal insecticide, Fungicide, and Rodenticide Act (FIFRA) label. Additional information can be found at the following link:
                 http://cfpub.epa.gov/npdes/home.cfm?program_id=41

• Baseline Monitoring Frequency, Sample Type, and Reduced Monitoring Frequency  Policy for Industrial and Domestic Wastewater Treatment Facilities.
   

• Blending Septage from an Individual Sewage Disposal System (ISDS) with Biosolids

• Colorado Pollutant Trading Policy.  A policy providing an initial framework under which trades can be established and approved, defining key terms, outlining use limitations and minimum trade criteria, and establishing the relationship between trades and more traditional water quality control measures.

•  Colorado River Salinity Standards  Regulation No. 39
   

• Compliance Schedule Policy

• Compliance Schedule Policy Comment Letter

• Implementing Narrative Standards in Discharge Permits for the Protection of Irrigated Crops.  A policy providing  guidance to the development of effluent limits, under two narrative standards, for permitting discharges to surface waters that subsequently are diverted to crop irrigation. The scope of this guidance is limited to two measures of dissolved salts that can be used to further protect the downstream suitability of state waters for crop irrigation. 

• Low Risk Discharge Policy and Guidance Documents

  • WQP Policy 27   Low Risk Discharges     

    • Low Risk Discharge Policy Comment Letter

  • Low Risk Discharge Guidance Snow Melting

    • Snow Melting Machines Comment Letter

  • Low Risk Discharge Guidance Swimming Pools

    • Swimming Pools Comment Letter

  • Low Risk Discharge Guidance for Potable Water

    • Potable Water Policy Comment Letter

  • Low Risk Discharge of Uncontaminated Groundwater to Land

    • Uncontaminated Groundwater to Land Comment Letter

  • Low Risk Discharge from Surface Cosmetic Power Washing Operations to Land

    • Surface Cosmetic Power Washing Operations to Land Comment Letter

  • Fire Safety Maintenance Activities Draft Guidance 10-2011

• Mixing Zone Implementation Guidance

• MOA regarding Threatened and Endangered Species

• Practical Quantitation Limitation Guidance Document
   

• Preliminary Effluent Limitations (PEL) Information
  Information is provided on the PEL which is required in the Site Application Process for new or modified domestic wastewater treatment facilities. The PEL process and the fee schedule are provided.

• Reasonable Potential Procedural Guidance
   

• Temperature Standards Implementation - WQP 23
  A policy providing guidance on the development of effluent limits for permitting discharges to surface waters.   This guidance is based on implementing newly promulgated temperature standards for the surface waters of Colorado.   If you have questions, please call 303-692-3608.

  • Response to Comments on WQP-23

• Whole Effluent Toxicity (WET) Testing Policy WPC Program Permits 1

  • WQCD Response to WET Comments

2. Domestic

• Domestic Discharges to Ground Water: 
  Overview of Colorado's Domestic Ground Water Discharge Permit Program

• Industrial Discharges to Ground Water:
  Water Quality Control Division and Hazardous Materials and Waste Management Division Solid Waste Program Coordination on Regulation of Groundwater Impacts Under SB-181. 
   

• Water Smarts:  A Homeowner's Guide to Mountain Ground Water

• Lagoon/pond system guidance

• Septic system guidance

• Water Well Construction Rules - Exit to Office of the State Engineer

• Guidelines for Estimating Leakage from Existing Sewage Lagoons (These guidelines were developed and implemented by the State of Oregon Department of Environmental Quality and provide just one example of the Colorado WQCD's expectations for the contents and approach of a lagoon seepage rate study.)

• Monitoring well completion report

• Practical Guide for Ground Water Sampling - Illinois State Water Survey

• Ground Water Monitoring Guidance Manual - Pennsylvania Department of Environmental Protection

• Compendium of ERT Ground Water Sampling Procedures - USEPA

• Ground Water Sampling Guidelines for Superfund and RCRA Project Managers - Ground Water and Engineering Forums

• Suggested monitoring well sampling protocol

• Suggested lysimeter sampling protocol

3. Industrial:

• Stormwater Management Plan (SWMP) Guidance

  • Light & Heavy Industry

  • Recycling

  • Sand & Gravel

  • Metal Mining

• Stormwater Sampling Guidance Document

• Industrial Stormwater Monitoring and Sampling Guide (EPA)

• Stormwater Resources

• EPA Stormwater Web page
  • EPA phase II fact sheets
• National Stormwater BMP database - Database of monitoring results showing effectiveness of structural and non-structural BMPs.

4. Stormwater  

Stormwater Program Fact Sheet  

5.  Construction

• Fact Sheet - Construction

• Fact Sheet Oil & Gas Industry Construction

• Construction Dewatering Frequently Asked Questions

6. Pretreatment

• Colorado Regulation No. 63 - Pretreatment Regulations
• Notice of discharge requirements for state issued permit
• For more information on the Pretreatment Program:
  • EPA Pretreatment web page

For more information, please contact the Water Quality Control Division at 303-692-3500 and ask for the public assistance person for the Permits Unit.