FREMONT COUNTY ON-SITE WASTEWATER TREATMENT SYSTEM REGULATIONS Table of Contents I. Authority 1 II. Scope and Purpose 1 III. Definitions 3 IV. Applicability 19 A. Regulations Adopted By the Fremont County Board of Health 19 B. Permit Application Requirements and Procedures 20 C. Determination 23 D. Access to Site 23 E. Inspection Stages 23 F. Final approval of the permit 24 G. Division Authority to Administer and Enforce 24 H. Primary Enforcement Responsibility 24 I. Product Development Permit 24 J. Prohibition of OWTS in Unsuitable Areas 26 K. Licensing of System Contractors and System Cleaners 26 L. Transfer of Title Inspections 27 M. Renewable Permits 27 N. Variance Procedure 27 O. General Prohibitions 30 P. Septage 31 Q. Treatment and Disposal 32 R. Cease and Desist Orders 37 S. Penalties 37 V. Site and Soil Evaluation 38 A. Requirements 38 B. Preliminary Investigation 38 C. Reconnaissance Visit 39 D. Detailed Soil Investigation 39 E. Markings of Soil Profile Test Pit Excavations or Percolation Holes 44 F. Report and Site Plan 44 G. Design Document 46 H. Site Protection 46 I. Qualifications for a Competent Technician 46 VI. Wastewater Flow and Strength 47 A. Wastewater Flows 47 B. Wastewater Strength 52 VII. Minimum Distances Between Components of an OWTS and Physical Features 54 A. Horizontal Distances, General 54 B. Reductions in Separation Distances 54 C. Dry Gulches, Cut Banks and Fill areas 54 D. Minimum or Increased Distances 55 E. Separation Distances to Specific Features 55 VIII. Design Criteria - General 58 A. Designed Flows 58 B. Specified Treatment Level 58 C. System Functionality 58 D. Accessibility 59 E. Plumbing Codes 59 F. Electrical Equipment 59 G. Failure Indicators 60 H. Sampling Access 60 I. Component Operating Instructions 60 J. Surface Activity 60 K Floodplains 61 L. Business / Commercial / Multi-Family OWTS 61 IX. Design Criteria - Components 61 A. Tanks and Vaults 61 B. Septic Tanks 62 C. Abandonment of tank 65 D. Pipe Standards and Bedding Requirements 65 E. Required Cleanouts 66 F. Distribution Box 66 G. Drop Box 67 H. Step-down/Relief Pipe 67 I. Wastewater Pumping and Dosing Syphon Systems 67 J. Effluent Screens 69 K. Grease Interceptor Tanks 70 X. Design Criteria - Soil Treatment Area 70 A. Size and Design 70 B. Conditions Requiring Professional Engineer 70 C. Soil Treatment area Calculations 71 D. Soil Treatment area Sizing Adjustments 74 E. Design of Distribution System 75 F. Soil Treatment Area Requirements 77 G. Storage/Distribution Media 78 H. Soil Replacement Systems 80 I. Repairs 81 XI. Design Criteria - Higher Level Treatment Systems 84 A. General 84 B. Treatment Levels 85 C. Sand Filters 85 D. Mound System 89 E. Rock Plant Filter (Constructed Wetland) 90 XII. Design Criteria - Other Facilities 91 A. Evapotranspiration and Evapotranspiration/Absorption System 91 B. Seepage Pits 93 C. Vaults Other Than Vault Privies 94 D. Privies 94 E. Incinerating, Composting and Chemical Toilets 95 F. Silt Trench Latrine 96 G. Systems Not Discharging Through a Soil/Sand filter Treatment Area 96 XIII. Technology Review and Acceptance 98 A. General 98 B. The division Review 98 C. Product Acceptance Requirements 98 D. Proprietary Treatment Product Acceptance Requirements 99 E. Proprietary Distribution Product Acceptance Requirements 101 F. Septic Tank Acceptance Requirements 102 G. Other Product Acceptance Requirements 103 XIV. Operation and Maintenance 103 A. Responsibility 103 B. Service Label 103 C. Fremont County Board of Health May Adopt 103 D. Permitting and Oversite of Maintenance 103 E. Monitoring and Sampling 103 XV. Severability 104 XVI. Materials Incorporated by Reference 104 FREMONT COUNTY ON-SITE WASTEWATER TREATMENT SYSTEM REGULATIONS I . Authority This regulation is promulgated pursuant to the On-site Wastewater Treatment System Act, 25-10-101, et seq. C.R.S. II . Scope and Purpose A. Declaration / Title 1. In order to preserve the environment and protect the public health and water quality; to eliminate and control causes of disease, infection, and aerosol contamination; and to reduce and control the pollution of the air, land and water, it is declared to be in the public interest to establish minimum standards and regulations for On-site Wastewater Treatment Systems (OWTS) in the state of Colorado and to provide the authority for the administration and enforcement of such minimum standards and regulations. 2. This regulation will apply to On-site Wastewater Treatment Systems as defined in section 25-10-103(12), C.R.S. and shall be known as the FREMONT COUNTY ON-SITE WASTEWATER TREATMENT SYSTEM REGULATIONS. B. Purpose 1. The purpose of this regulation as authorized by the OWTS Act is to establish minimum standards for the location, design, construction, performance, installation, alteration and use of OWTS within the state of Colorado, and establish the minimum requirements for regulations adopted by THE FREMONT COUNTY BOARD OF HEALTH including but not limited to permit application requirements; requirements for issuing permits; the inspection, testing, and supervision of installed systems; the 1 maintenance and cleaning of systems; the disposal of waste material and the issuance of cease and desist orders. C. Effluent Discharged to Surface Waters 1. Any system that will discharge into State waters must be designed by a professional engineer. The discharge permit application must be submitted for preliminary approval to the Fremont County Board of Health. Once approved by the Fremont County Board of Health, the application must be submitted to the Water Quality Control Division for review in accordance with the Water Quality Control Act, 25-8-101, et seq. C.R.S, and all applicable regulations of the Water Quality Control Commission. Compliance with such a permit will be deemed full compliance with this regulation. D. Jurisdiction of Fremont County Health Agencies 1. The jurisdiction of the Fremont County Public Health Agency extends over all unincorporated areas and over all municipal corporations within the territorial limits of the county or the counties comprising the district public health agency, but not over the territory of any municipal corporation that maintains its own public health agency. 2 III. Definitions: 1. Absorption system: A leaching field and adjacent soils or other system for the treatment of sewage in an On-site Wastewater Treatment System by means of absorption into the ground. See Soil treatment area. 2. Accessible: Means easily reached, attained or entered by the necessary equipment or maintenance provider. 3. Applicant: A person who submits an application for a permit for an On-site Wastewater Treatment System. 4. Basal Area: The effective area available to transmit the treated effluent from the filter media in a mound system into the in-situ receiving soils. The perimeter is measured at the interface of the imported material and in-situ soil. On sloping sites, only the area down-gradient from the up-slope edge of the distribution media may be included in the calculation. 5. Bed: A below-grade soil treatment area with a level sub-base consisting of a shallow excavation greater than three feet wide containing distribution media and more than one lateral. 6. Bedrock: Continuous rock that underlies the soil or is exposed at the surface. Bedrock is generally considered impervious, but if fractured or deteriorated, it may allow effluent to pass through without adequate treatment. 7. Bedroom: A room with an egress window, a closet, and/or is intended for sleeping purposes; or as defined by the local board of health, as stated in the local OWTS regulation. 8. Biochemical Oxygen Demand, Five-Day: (BOD5) Quantitative measure of the amount of oxygen consumed by bacteria while stabilizing, digesting, or treating biodegradable organic matter under aerobic conditions over a five-day incubation period; expressed in milligrams per liter (mg/L). 9. Biochemical Oxygen Demand, Carbonaceous Five Day: (CBOD5) Quantitative measure of the amount of oxygen consumed by bacteria while stabilizing, digesting, or treating the organic matter under aerobic conditions over a five-day incubation period while in the presence of a chemical inhibitor to block nitrification; expressed in milligrams per liter (mg/L). 3 10. Building sewer: Piping that conveys wastewater to the first system component or the sewer main. 11. Carbonaceous Biochemical Oxygen Demand: See Biochemical Oxygen Demand, Carbonaceous. 12. Cesspool: An unlined or partially lined underground pit or underground perforated receptacle into which raw household wastewater is discharged and from which the liquid seeps into the surrounding soil. Cesspool does not include a septic tank. 13. Chamber: An open, arch-shaped structure providing an open-bottom soil interface with permeable sidewalls used for distribution of effluent in a soil absorption system. 14. Cistern: An underground, enclosed unpressurized reservoir or tank for storing water as part of a potable water supply system. 15. Cleaning: The act of removing septage or other wastes from a wastewater treatment system component or grease/waste from a grease interceptor. 16. Colorado Plumbing Code: Rules and Regulations of the Colorado State Plumbing Board (3 CCR 720-1). 17. Commission: The Water Quality Control Commission created by section 25-8-201, C.R.S. 18. Competent technician: A person who has the appreciate expertise and is able to conduct and interpret the results of soil profile test pit excavations, percolation test, and site evaluations. This individual has also met the required “Competent Technician” as defined section V.5.I 19. Component: A subsection of an On-site Wastewater Treatment System; a component may include multiple devices. 20. Composting toilet: A self-contained waterless toilet designed to decompose non-water-carried human wastes through microbial action and to store the resulting matter for disposal. 21. Consistence: The degree and kind of cohesion and adhesion that soil exhibits and/or the resistance of soil to deformation or rupture under an applied stress to an extent that the soil density would restrict permeability.