HomeMy WebLinkAboutR80-11 Exhibit A Sewage Disposal RegulationsEAGLE COUNTY
INDIVIDUAL SEWAGE DISPOSAL
REGULATIONS
$3.00
EAGLE COUNTY
INDIVIDUAL SEWAGE DISPOSAL SYSTEM R
Adopted February 11, 1980
Effective March 27, 1980
INDEX
INTRODUCTION
SECTION I: TITLE AND POLICY
1.1 Title
1.2 Policy
SECTION II: DEFINITIONS
2.0 General
2.1 Absorption Bed
2.2 Absorption System
2.3 Absorption Trench
2.4 Acceptable Design
2.5 Aerobic Sewage Treatment System
2.6 Analytical Parameters
2.7 Applicant
2.8 Approved
2.9 Bedrock
2.10 Board of Health
2.11 Building Sewer
2.12 Cesspool
2.13 Cistern
2.14 Competent Technician
2.15 Component Parts
2.16 Composting Toilet
2.17 Department
2.18 Dispersal System
2.19 Distribution Box
2.20 Diversion Valve
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2.21 Dosing Tank
2.22 Dry Well
2.23 Effluent
2.24 Evapotranspiration System
2.25 Experimental System
2.26 Geologist
2.27 Groundwater Table
2.28 Guidelines
2.29 Health Officer
2.30 Holding Tank
2.31 Individual Sewage Disposal System
2.32 Liner
2.33 Manufacturer
2.34 Matrix
2.35 Mini - System
2.36 Owner
2.37 Percolation Test(s)
2.38 Permeability
2.39 Permit
2.40 Person
2.41 Plot Plan
2.42 Pre - existing, Non - conforming System
2.43 Privy
2.44 Registered Professional Engineer
2.45 Sand Filter
2.46 Sand Filter Trenches
2.47 Sanitarian
2.48 Seepage Pit
2.49 Septic Tank
2.50 Serial Distribution
2.51 Sewage
2.52 Sewage Treatment Works
2.53 Stabilization Pond
2.54 State Waters
i r
2.55
Subsurface Sand Filter
2.56
Suitable Soil
2.57
Systems Cleaner
2.58
Systems Contractor
2.59
vault
2.60
Wastewater Pond
2.61
Water Quality Control Commission
SECTION III: ADMINISTRATION AND ENFORCEMENT
3.1 General Sanitation Requirements
33..2, Inspections and Right of Entry
3.3 Permit Application Requirements
3.4 Permit Expiration
3.5 Owner Responsibility
3.6 Repair /Emergency Use Permit
3.7 Expanded Use of Existing System
3.8 Pre - existing, Non - conforming System
3.9 Department Liability
3.10 Types of Suitable Systems
3.11 Design Capacity over 2,000 Gallons per Day
3.12 Application Review
3.13 Specifics on Permit
3.14 Department Notification of Completion
3.15 Final Inspection of System
3.16 Denial of a Permit or Disapproval of Plans
3.17 Community Sewers
3.18 Acceptable Design List
3.19 Experimental Systems Approval
3.20 Submission of Plans for Proposed Subdivisions
3.21 Regulations of Systems Contractors
3.22 Regulations of Systems Cleaners
3.23 Notice of Violation
24 Cease and Desist Order
3.25 Maintenance, Cleaning, and Effluent Testing Schedules
3.26 Prohibition of Systems in Unsuitable Areas
3.27 General Prohibitions
3.28 Penalties
3.29 —'Jurisdiction
3.30 Severability
3.31 Saving Clause
3.32 Effective Date
SECTION IV: GENERAL TECHNICAL REQUIREMENTS
4.1 Calculation of Sewage Flow
4.2 Minimum Horizontal Distances Between Components & Physical Features
SECTION V: SOIL TEST
5.1 Location
5.2 Dimensions
5.3 Procedure
5.4 Performance of Percolation Tests
5.5 Alternate Percolation Test
5.6 Location of the Groundwater Table
5.7 Suitable Soil Criteria
SECTION VI: COMPONENT DESIGN CRITERIA (GENERAL)
6.1 Reliability
6.2 Plumbing Codes
6.3 Electrical Equipment
6.4 Identification and Data Marking
6.5 Structural Integrity
6.6 Watertight Requirement
6.7 Accessibility for Inspection and Maintenance
6.8 Indicators of Failure for Systems Utilizing Mechanical Apparatus
6.9 Serviceability
6.10 Sampling Access
6.11 Instructions
6.12 Surface Activity
6.13 Distribution Box
6.14 Sewage Pumping System Where Applicable
SECTION VII: COMPONENT DESIGN CRITERIA (FIRST STAGE TREATMENT UNITS)
7.1 Septic Tank
7.2 Aerobic Sewage Treatment System
7.3 Installation of Septic Tanks
SECTION VIII: COMPONENT DESIGN CRITERIA (SECOND OR LATER STAGE TREATMENT UNITS)
8.1 Soil Absorption System (General)
8.2 Absorption Trench
8.3 Seepage Beds
8.4 Seepage Pits
8.5 Serial Distribution System
8.6 Evapotranspiration Disposal of Effluent
8.7 Sand Filter
8.8 Wastewater Pond
SECTION IX: DESIGN CRITERIA (OTHER FACILITIES)
9.1 Mini - System
9.2 Vault
9.3 Vault Privy
9.4 Pit Privy
9.5 Incineration and Chemical Toilets
9.6 Slit Trench
9.7 Business, Commercial, Industrial, Institutional, or Multi - Family
Dwelling Waste Systems
9.8 Systems with Limited or Undetermined Data
SECTION X: TREATMENT SYSTEMS OTHER THAN THOSE DISCHARGING THROUGH A
SOIL ABSORPTION OR SAND FILTER SYSTEM AND NON - DISCHARGING SYSTEMS
10.0 General
10.1 Review of Application
10.2 Minimum Performance Criteria
10.3 Methods of Analysis - Sampling Points
10.4 Disinfection of Effluent
SECTION XI: MANUFACTURED UNITS UTILIZING MECHANICAL APPARATUS FOR
TREATMENT OF SEWAGE
11.0 General
11.1 Conditions for Use
11.2 Approval or Certification
SECTION XII: EFFLUENT DISCHARGED TO STATE WATERS
SECTION XIII: WATER QUALITY CONTROL COMMISSION REGULATIONS
SECTION XIV: INSTALLATION
14.0
General
14.1
Mechanical Components
14.2
Covers, Barriers, or Other Protection
SECTION XV:
OPERATION AND MAINTENANCE
15.1
Responsibility
15.2
Service Label
15.3
Maintenance and Cleaning
15.4
Monitoring and Sampling
15.5
Disposal of Waste Materials
15.6
Compliance
15.7
Termination of Use of System
TABLES
TABLE
1
- Maintenance, Cleaning and Effluent Testing Schedules -
p. 19
TABLE
2
- Table of Quantities and HODS Strength of Sewage -
p. 22
TABLE
3
- Table of Minimum Horizontal Distances Between
Components of a Sewage Disposal System and Pertinent
Physical Features -
p. 25a
TABLE
4
- Septic Tank Size Based on Number of Bedrooms -
p. 31
TABLE
5
- Subsurface Absorption Area for Dwelling Use -
p. 35
APPENDIXES
APPENDIX A - Statement of Basis and Purposes
.. APPENDIX B - Soil Classification Systems
(Soil- Separate Size Limits)
APPENDIX C - Guide for Textural Classification
APPENDIX D - Guide for Soil Compaction
INTRODUCTION
DECLARATION:
In order to preserve the environment and protect the public
health; 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, rules, and regulations for
individual sewage disposal systems in Eagle County and to provide
the authority for the administration and enforcement of such minimum
standards, rules, and regulations.
PURPOSE:
The purpose of these Regulations as authorized and required by
Article lo, Title 25, C.R.S. 1973 is to provide guidance and
establish minimum standards for the location, construction, per-
formance, installation, alteration, and use of individual sewage
disposal systems within Eagle County, and shall constitute the basis
for the adoption of detailed rules and regulations by the Eagle
County Board of Health concerning the application for and issuance of
permits, the inspection, testing, and supervision of installed
systems, the issuance of cease and desist orders, the maintenance and
cleaning of systems, and the disposal of waste material.
CAPACITY:
These Regulations shall apply to individual sewage disposal systems
with a design capacity of 2,000 gallons or less per day.
TIME FRAME:
Unless conditions permit, such conditions shall include but not be
limited to weather, snowfall, frost, and at the discretion of the
Department, no permits for new construction will be issued between
November 15 and March 15. Installation must be completed by December 1
for all new construction for which permits were issued prior to
November 15.
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SECTION I: TITLE AND POLICY
1.1 Title: These Regulations shall be known as the Individual
Sewage Disposal Systems Regulations.
1.2 Policy: The Eagle County Board of Health declares that the
purpose of these Regulations is to protect the physical and
mental health of the people, to control communicable diseases,
and to regulate wastes from dwellings, business, industrial,
and public buildings. These Regulations shall be applicable
throughout Eagle County, and shall be enforced by the Board of
Health. These Regulations are designed to control construction,
location, and operation of sewage disposal systems, the trans-
portation and final disposal of sewage materials, and control of
installers of such systems. Eagle County Board of Health
declares that its general policy is to require the use of public
sewer systems where and whenever feasible, and to limit the
installation of individual sewage disposal systems only to
areas that are not feasible for public sewers.
SECTION II: DEFINITIONS
2.0 General: The following definitions shall apply in the interpre-
tation and enforcement of these Regulations. The word "shall"
as used herein indicates a mandatory requirement.
2.1 Absorption Bed means a subsurface soil absorption area which
consists of trenches wider than three (3) feet each, containing
a minimum of twelve (12) inches of clean aggregate, together
with a system of perforated distribution pipes through which
effluent may seep or leach into the surrounding soil. (A
synonym for "Seepage Bed ")
2.2 Absorption System means a leaching field and adjacent soils or
other system for the treatment of sewage in an individual sewage
disposal system by means of absorption into the ground.
2.3 Absorption Trench means one or more trenches not over three (3)
feet in width of varying length and depth in which sewage effluent
is percolated into the soil.
2.4 Acceptable Design means a standardized design of a tank, plant,
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or system, the installation of which is permitted by the Depart-
ment, provided that site requirements are met. °^
2.5 Aerobic Sewage Treatment System means an individual sewage disposal
system employing biological action which is maintained by the
addition of air or oxygen.
2.6 Analytical Parameters means:
A. Suspended Solids (SS): Solids in the sewage that can be
removed readily by standard filtering procedures in a
laboratory, reported as milligrams per liter (mg /1).
B. Volatile Suspended Solids (VSS): The quantity of solids
.in sewage which are lost on ignition of the dry suspended
solids at 6000C., reported as percent of total suspended
solids.
C. Settleable Solids: Solids in the sewage which will settle,
as distinct from remaining in suspension reported as
milliliters per liter of sample after 30 minutes of
settling time (ml /30 mins.).
D. pH: The logarithm of the reciprocal of the hydrogen -ion
concentration.
E. Dissolved Oxygen (DO): The oxygen dissolved in sewage
reported as milligrams per liter (mg /1).
F. Chemical Oxygen Demand: The measure of oxygen equivalent of
that portion of organic matter that can be oxidized by a
strong chemical oxidizing agent and reported as milligrams
per liter (mg /1).
G. Five -Day Biochemical Oxygen Demand (BOD5): The quantity of
oxygen used in the biochemical oxidation of organic matter
in five days at 20 C. under specific conditions reported
as milligrams per liter (mg /1).
2.7 Applicant means any person who submits an application for a
permit for an individual sewage disposal system.
2.8 Approved means official consent given in writing by the Board
of Health.
2.9 Bedrock means the more or less solid undisturbed rock in place
either at the surface or beneath surfacial deposits of gravel,
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sand, or soil or a consolidated rock formation of impervious
material which may exhibit jointed, fractured, or deteriorated
characteristics.
2.10 Board of Health means the Board of County Commissioners of
Eagle County, Colorado.
2.11 Building Sewer means that part of the piping of a drainage system
which extends from the end of the building drain and which
receives the discharge of the building drain and conveys it
to a public sewer, private sewer, individual sewage disposal
system, or other point of disposal.
2.12 Cesspool means a covered underground receptacle which receives
untreated sewage from a building and permits the untreated
sewage to seep into surrounding soil.
2.13 Cistern means a watertight, covered receptacle of non -toxic
material which is designed for potable water storage.
2.14 Competent Technician means a person designated by the Department
who is able to conduct and interpret the results of percolation
tests.
2.15 Component Parts means all physical, mechanical, and electrical
components of an aeration plant.
2.16 Composting Toilet means a unit which consists of a toilet seat
and cover over a riser which connects to a compartment or vault
that contains or will receive composting materials sufficient
to reduce waste by aerobic decomposition.
2.17 Department means the Eagle County Department of Environmental
Health as appointed by the Eagle County Commissioners.
2.18 Dispersal System means a system for the disposal of effluent
after final treatment in an individual sewage disposal system, by
a method which does not depend upon or utilize the treatment
capability of the soil.
2.19 Distribution Box means a watertight chamber below the outlet
level of a septic tank or treatment unit and from which effluent
enters the absorption system.
2.20 Diversion Valve means a 3" to 6" two -way valve with one (1)
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inlet and two (2) outlets where sewage flow can be diverted
into two (2) separate and different directions. It must be
provided with a valve key or control unit that can be operated
from the surface of the ground.
2.21 Dosing Tank means a tank which provides for a high rate, periodic
discharge.
2.22 Dry Well means a subsurface absorption system dependent upon
suitable soil at a depth greater than that of an absorption
trench or bed (holes 5 to 15 feet in diameter and 2 to 10 feet deep),
designed on the basis of sidewall area (lined with concrete
rings or block or equal material). (A synonym for "Seepage Pit ")
2.23 Effluent means the liquid waste discharge from an individual
sewage disposal system.
2.24 Evapotranspiration System means a type of dispersal system that
wholly or primarily utilizes liquid evaporation or transpiration
by vegetation as a means of effluent disposal.
2.25 Experimental System means a particular design or type of system
based upon improvements, or development in the technology of
sewage disposal in which further testing is_ required in order
to provide sufficient information before acceptance.
2.26 Geologist means a Professional Geologist as defined in Section 34-
1 -201, C.R.S. 1973, as amended.
2.27 Groundwater Table means the upper surface of groundwater in the
zone of saturation of geologic formation.
2.28 Guidelines means minimum requirements as described in this document.
2.29 Health Officer means the chief administrative and executive
officer of the Department or the appointed health officer
designated by the Board of Health.
2.30 Holding Tank means a watertight receptacle for the retention
of sewage either before, during, or after treatment.
2.31 Individual Sewage Disposal System, and the term "System" where
the context so indicates, means a system or facility for treating,
neutralizing, stabilizing, or disposing of sewage which is not
a part of nor connected to a sewage treatment works.
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,a
2.32 Liner means a watertight membrane liner of at least 0.01 inch
(10 mil) thickness which is used to prevent effluent from
entering the soil or groundwater table. Material shall be
polyvinyl chloride or material of equal integrity.
2.33 Manufacturer means the person or firm that constructs or assembles
individual sewage treatment system components.
2.34 Matrix means the material in which effluent is dispersed for
percolation or capillary action.
2.35 Mini - System means a system designed to accommodate only wastes
from sinks, lavatories, tubs, showers, and laundry.
2.36 Owner means the person who is owner of record of the land on
which an individual sewage disposal system is to be designed,
constructed, installed, altered, extended or used.
2.37 Percolation Test(s) means a subsurface soil test at the depth
of a proposed absorption system or similar component of an
individual sewage disposal system to determine the water
absorption capability of the soil, the results of which are
normally expressed as the rate at which one inch of water is
absorbed.
2.38 Permeability means the property of a material which permits
movement of water through the material.
2.39 Permit means a permit for the construction or alteration,
installation, and use or for the repair of an individual
sewage disposal system.
2.40 Person means individual, partnership, firm, corporation,
association, or other legal entity and also the State, any
political subdivision thereof, or other governmental entity.
2.41 Plot Plan means an accurate drawing or map indicating the
dimensions and location of property lines, buildings, wells,
individual sewage disposal systems, water courses, geographical
features, and other pertinent information as required.
2.42 Pre- existing, Non - conforming System means an individual sewage
disposal system installed prior to the 1973 adoption of Eagle
County Regulations.
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2.43 Privy means a structure allowing for the disposal of excreta
not transported by a sewer and which provides privacy and shelter
and prevents access to the excreta by flies, rodents, or other
animals.
2.44 Registered Professional Engineer means an engineer licensed in
accordance with Section 12 -25 -111, C.R.S. 1973, as amended.
2.45 Sand Filter means a subsurface system which utilizes filtration
or absorption or both, which contains an intermediate layer of
sand as filter material.
2.46 Sand Filter Trenches means a subsurface filtration and absorption
device which consists of a system of trenches, each composed of
perforated pipe or drain tile surrounded by clean, coarse
aggregate and also containing an intermediate layer of sand as
filter material, together with an underdrain for drainage of
the effluent.
2.47 Sanitarian means a person who is trained in physical, biological,
and sanitary science to carry out inspectional and educational
duties in the field of environmental sanitation.
2.48 Seepage Pit means a subsurface absorption system dependent upon
suitable soil at a depth greater than that of an absorption
trench or bed (holes 5 to 15 feet in diameter and 2 to 10 feet
deep), designed on the basis of sidewall area (lined with concrete
rings or block or equal material). (A synonym for "Dry Well ")
2.49 Septic Tank means a watertight, accessible covered receptacle
designed and constructed to receive sewage from a building
sewer, to settle solids from the liquid, to digest organic
matter, and store digested solids through a period of retention
and allow the clarified liquids to discharge to other treatment
units for final disposal.
2.50 Serial Distribution means an arrangement of absorption trenches,
seepage pits, or seepage beds where effluent is retained to
utilize the abosrption capacity of a component before flowing
into a succeeding component.
2.51 Sewage means a combination of liquid wastes which may include
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chemicals, house wastes, human excreta, animal or vegetable
.-h., matter in suspension or solution, or other solids in suspension
or solution and which is discharged from a dwelling, building,
processing or manufacturing plant, institution, industrial plant,
or other establishment.
2.52
Sewage Treatment Works means a system or facility for treating,
neutralizing, stabilizing, or disposing of sewage, which
system or facility has a designed capacity to receive more
than two thousand gallons of sewage per day. The term "sewage
treatment works" includes appurtenances such as interceptors,
collection lines, outfall and the outlet sewers, pumping
stations, and related equipment.
2.53
Stabilization Pond means a reservoir of dike land which receives
liquid, to digest organic matter and store digested solids
through a period of retention and allow the clarified liquids
----
to discharge to other treatment units for final disposal.
- ---'' 2.54
State Waters means any and all surface and subsurface waters
which are contained in or flow in or through this State, except
waters in sewerage systems, waters in treatment works of disposal
systems, waters in potable water distribution systems, and all
waters withdrawn for use, until all uses and treatment have been
completed.
2.55
Subsurface Sand Filter means a subsurface filtration and
absorption device which consists of a wide bed, composed of a
number of lines of perforated pipe or drain tile, surrounded
by a matrix of clean, coarse aggregate containing an intermediate
layer of sand as a filtering material, and provided with a system
of underdrains for drainage of the effluent.
2.56
Suitable Soil means a soil which will effectively filter
.�
effluent by removal of organisms and suspended solids before
--
the effluent reaches any highly permeable earth such as joints
in bedrock, gravels, or very coarse soils. Such soils shall also
meet the requirements of both the absorption criteria or perco-
lation test requirements and have a vertical thickness of at
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least four (4) feet.
2.57 Systems Cleaner means a person engaged in and who holds himself
out as a specialist in the cleaning and pumping of sewage
disposal systems and removal of the residues deposited in the
operation thereof.
2.58 Systems Contractor means a person engaged in and who holds himself
out as a specialist in the installation, renovation, and repair
of sewage disposal systems.
2.59 Vault means an approved watertight, covered receptacle, which
is designed to receive and store excreta or wastes either from
a sewer or from a privy and is accessible for the periodic
removal of its contents.
2.60 Wastewater Pond means a designed pond which receives exclusively
wastewater from a first stage treatment unit and which provides
an additional degree of treatment.
2.61 Water Quality Control Commission means the commission created
by Section 25 -8 -201, C.R.S. 1973, as amended.
SECTION III: ADMINISTRATION AND ENFORCEMENT
3.1 General Sanitation Requirements: The owners of any structure
where people live, work, or congregate shall insure that the
structure contains adequate, convenient, sanitary toilet and
sewage disposal systems in good working order. Under no
condition shall sewage effluent be permitted to be discharged
upon the surface of the ground, or into waters of the State,
unless the sewage or effluent meets the minimum requirements
of these Regulations or the Water Quality Standards of the
Colorado Water Quality Control Commission, or the Colorado
Department of Health Guidelines Chapter 25, Article 10,
C.R.S. 1973, as amended, whichever are applicable.
3.2 Inspections and Right of Entry: For this purpose of enforcing
these Regulations, the Health Officer is authorized to enter
upon private property for the purpose of determining whether
or not sewage disposal facilities installed thereon are in
compliance with these Regulations. The owner or occupant of
every property having an individual sewage disposal system
shall give the Health Officer free access, after the Health
Officer has given reasonable notice, to the property for such
survey or inspection. If access is denied, the Health Officer
may apply to the District Court of Eagle County for an order
authorizing entry.
3.3 a) Prior to commencement of installation, alteration, or repair
of a system, a written application therefor to the Environ-
mental Health Department shall be made providing, as a minimum,
the information called for on the application form, and. a
permit shall have been issued by the Environmental Health
Department.
b) A permit fee of $75.00 shall be required of applicants for
new individual sewage disposal systems, payable to Eagle
County, at the Environmental Health Department.
c) A permit fee of $75.00 shall be charged for alteration,
enlargement, or any repair involving alteration of an
existing sewage disposal system.
d) For minor repairs of less than $100 for maintenance
of the individual sewage disposal system, no fee shall be
required.
3.4 If both a building permit and an individual sewage disposal
permit are issued for the same property, and construction is
not commenced prior to the expiration date of the building
permit, the individual sewage disposal permit shall expire at
the same time as the building permit. If an individual sewage
disposal permit is issued for property on .which no building
permit has been issued, the individual sewage disposal permit
shall expire 120 days after its issuance if construction has
not been commenced. Any changes in plans or specifications
after permit has been issued invalidates the permit, unless
approval is secured in writing from the Health Officer for such
changes. An expired permit may be extended or renewed if:
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a. There has been no change in plans and specifications of
the proposed system as set out in the original applica-
tion; and
b. The surrounding land, in its use or zoning, have not changed
.
so as to cause the original application not to be acceptable
under these Regulations.
3.5 The property owner shall be responsible for proper maintenance
of the system and for abatement of any nuisance arising from
its failure.
3.6 The Environmental Health Department may issue a repair permit
and an emergency use permit to the owner or occupant of property
on which a system is not functioning properly. Application for
a repair permit shall be made by such owner or occupant to the
Environmental Health Department within two business days after
receiving notice from the Department that the system is not
functioning in compliance with Section 25, Article 10, C.R.S.
1973, as amended. The permit shall provide for a reasonable
period of time, not to exceed 30 days, as provided by Section 25,
Article 10- 106(k), C.R.S. 1973, as amended, within which repairs
shall be made. At the end of said period of time, the system
shall be inspected by the Department to insure that it is func-
tioning properly. Concurrently with the issuance of a repair
permit, the Environmental Health Department may issue an emergency
use permit authorizing continued use of a malfunctioning system
on an emergency basis for a period not to exceed the period
stated in the repair permit. Such an emergency use permit may
be extended, for good cause shown, in the event repairs may
not be completed in the period stated in the repair permit through
no fault of the owner or occupant.
3.7 An individual sewage disposal system permit shall be required for
expanded use of an existing system beyond the design capacity of
said system.
3.8 Upon failure or need of repair or alteration, pre- existing,
non - conforming systems must be brought up to current regulations
of a two - compartment septic tank and the required square footage
of absorption area.
3.9 The issuance of a permit does not constitute assumption by the
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Department or its employees of liability for the failure of
any sewage disposal system.
3.10 The Registered Professional Engineer or Technician of the Health
Department, acting on behalf of the Department, shall determine
the type of sewage disposal systems which are suitable for the
property, and may give a conditional approval for a permit for
the proposed sewage disposal system; or may recommend disapproval
of the application and denial of a permit if the proposed system
cannot be made to comply with these Regulations. The conditional
approval shall set forth conditions precedent to the issuance
of a permit including effluent testing, cleaning or maintenance
schedules, or other special conditions. No permit shall be
issued to the applicant or to a subsequent owner until the
conditions have been met. Except as provided in Section 25 -10-
105, C.R.S. 1973, as amended, no permits shall be issued for the
following systems unless they are designed by a Registered
Professional Engineer and after they have been reviewed by the
Board of Health:
a. Systems disposing of effluent into State waters;
b. Systems disposing of effluent upon the ground;
C. Systems which service commercial, business, institutions,
industry, or multi - family dwellings;
d. Absorption field for which the location cannot meet
suitable soil requirements;
e. Experimental systems.
3.11 In the case of any system with a design capacity over 2,000
gallons of sewage per day, or which discharges effluent into
State waters, or are designed to serve 20 or more persons per
day, the Department may give its conditional approval or may
disapprove the application. Thereafter the application,
together with the Department's recommendation, shall be forwarded
to the Water Quality Control Commission for review. If either
the Department or the Water Quality Control Commission disapproves
the application, no final permit shall be issued.
3.12 Application Review:
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a. The application shall include such information, data,
plans, specifications, statements, and commitments as
required by the Department to carry out the purpose of
Title 25, Article 10, C.R.S. 1973, as amended.
b. After receiving an application for an individual sewage
disposal system permit, the application shall be reviewed
by the Environmental Health Department and an inspection
shall be made by the Health Officer or his designated
representative consisting of:
1. Inspection of the premises;
2. Evaluation of soil where percolation tests are required;
3. A determination as to the suitability of the site and
of the proposed design based upon verification of the
groundwater table, suitable soil, depth to bedrock,
ground slope, and pertinent physical features;
4. When specific evidence indicates that subsurface
conditions exist that may endanger State waters,
additional hydrological, geological, or engineering
information provided by a Registered Professional
Engineer or Geologist may be required;
5. When, in the opinion of the Health Officer, the Depart-
ment possesses sufficient information to make one or more
provisions of this section unnecessary, he may waive
all or any part thereof.
3.13 The permit issued shall specify the stage of construction,
installation, alteration, or repair at which time the Environ-
mental Health Department will require and the owner of the
system shall provide the Department with notice that the progress
of the work has been sufficiently completed to allow inspection
before the system is covered and /or placed in use to determine -_-.
if the work has been performed in accordance with the permit
requirements and to determine compliance of the system with
Title 25, Article 10, C.R.S. 1973, as amended, and the rules
and regulations adopted thereunder.
3.14 When construction of a sewage disposal system has been completed,
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the systems contractor or owner shall notify the Department
and a representative of the Department shall make a final
inspection.
3.15 If upon final inspection of the system the Health Officer finds
it installed in accordance with these Regulations and the permit,
the Health Officer shall issue final approval for the completed
system. If the system has been designed by or constructed
under the supervision of a Registered Professional Engineer,
he shall at this time certify to the Department that construction
and installation of the system has been completed in accordance
with the terms of the permit and these Regulations. If the
inspection discloses any significant departure from the description
or design of the system as stated in the application and permit,
or if any aspect of the system fails to comply with these
Regulations, approval shall be withheld and the original permit
shall be deemed to have expired. Written notice of deficiencies
causing the disapproval shall be given the systems contractor
or owner within 10 days following final inspection. The permit
then may be renewed upon payment of the fee as provided in
paragraph 3.3(b). Another inspection shall be made upon
notification that the deficiencies have been corrected and the
system brought into compliance with these Regulations.
3.16 Denial of a Permit or Disapproval of Plans:
a. Notice of Denial: Written notice of the denial of a permit
or disapproval of plans shall be given within 10 days to
the applicant by personal service or by registered or
certified mail, return receipt requested. Service by mail
shall be complete upon receipt by the Department of the
return receipt.
b. Appeal to the Board of Health: Any person who is denied a
-' permit, whose plans for an individual sewage disposal system
are disapproved, may appeal to the Board of Health as herein
provided.
C. Variance on Appeal: Upon finding that strict enforcement of
these Regulations would cause undue hardship to the applicant
and a further finding that a variance would not be injurious
to public health, the Board of Health may authorize the
issuance of a variance. The burden of proof is upon the
applicant to show that the variance will not injure adjacent
properties, will not conflict with the purposes of these
Regulations, and will not adversely affect the health of
any person.
d. Time of Appeal: Every appeal must be filed within thirty
(30) days from the date of denial.
e. Findings on Appeal: Upon review from denial by tt.e Eagle
County Board of Health, as provided by Section 25 -10 -106
(1)(f) C.R.S. 1973, as amended, that an applicant for an
individual sewage disposal system has demonstrated that
said system w:.11 be constructed and used in such a manner
as to comply with the declaration and intent of these guide-
lines and all applicable regulations and rules and required
terms and conditions in any permit issued thereto, a permit
may be issued therefor.
f. Finality of Denial: Denial shall become final upon the
expiration of time for filing an appeal, or when final
action is taken upon an appeal, whichever is later.
3.17 Community Sewers: Permits to construct, extend, or replace an
individual sewage disposal system shall be denied if municipal
or sanitation district sewers exist within 400 feet of the
applicant's dwelling, place of business, or institution; and if
the municipality or district agrees to provide service.
3.18 Acceptable Design List: The Health Officer shall prepare a list
of approved septic tanks, aeration plants, evapotranspiration
systems, or other systems which will recieve permits for
installation provided site and design requirements are met.
Manufacturers or designers may request approval of standardized
equipment or systems. Approval shall be granted only after
submission of such information as may be requested by the
Department, or if the Colorado Department of Health has previously
approved the design. Designs that meet all of the requirements
- 14 -
of these Regulations will be included on the list. The list
shall be revised monthly and shall be available to any person
upon request. Any design may be reviewed by the Health Officer
at any time upon reasonable notice if it complies with these
Regulations. Experimental. designs, properly identified as
such, which are undergoing testing, may be included on the list
with appropriate comments by the Health Officer.
3.19 Except for designs or types of systems which have been approved
by the Colorado Department of Health, the Board of Health may
approve an application for an experimental type system not
otherwise provided for in these Regulations only if the system
has been designed by a Registered Professional Engineer, and
only if the application provides for the installation of a
back -up system of an approved type in the event of failure of the
primary system. The Board of Health shall not arbitrarily
deny any person the right to consideration of an application
for such a system and shall apply reasonable performance standards
in determining whether to approve such application.
3.20 Submission of Plans for Proposed Subdivisions: Plans for
proposed subdivisions shall be submitted to this Department
for the review of proposed sewage disposal systems by a Registered
Professional Engineer or by a Technician of this Department in
accordance with requirements of these Regulations and the
requirements of the Eagle County Department of Environmental.
Health. The Health Officer may require the subdivider to submit
additional engineering or geological reports or data and to conduct
a study of the economic feasibility of the sewage treatment works
prior to making its recommendations.
3.21 Regulations of Systems Contractors:
a. No systems contractor shall install, renovate, or repair an
individual sewage disposal system unless he holds a valid
Systems Contractor license. Employees of a validly licensed
Systems Contractor shall not be required to be licensed.
The initial fee for a Systems Contractor license shall be
$25 per year. Licenses shall expire on December 31 of each
- 15 -
year and an annual renewal fee of $10 shall be charged. A
license which lapses because of failure to renew or is
revoked shall be subject to the fee established for new
licenses upon reapplication. Application for a new license
for a Systems Contractor whose license has been revoked
shall not be considered for at least one year after revocation.
b. Standard of Performance Required of Holders of Systems
Contractors Licenses:
1. Applications for Systems Contractors licenses or renewals
shall be made upon forms supplied by the Department.
2. Prior to the issuance or renewal of a license, the
Health Officer may require the applicant to demonstrate
adequate knowledge of these Regulations.
3. Installation, renovation, or repair of any individual
sewage disposal system shall be in compliance with these
Regulations and with the conditions set out in the
installation permit.
4. Notice of requested inspection shall be given by the
license holder not less than 24 hours before the inspection
is to be made.
5. A license holder shall deliver to the. owner the installation
permit within 7 days after the completion of an approved
installation.
6. A license holder shall have in his possession the
installation permit at the time construction begins, and
shall make the permit available at the time of final
inspection so that final approval may be endorsed upon it.
7. A license holder shall, within a reasonable time, return
the installation permit to the applicant or property
owner in the event that he cannot or does not desire to
begin the installation of the individual sewage disposal
system.
C. Revocation of a Systems Contractor License:
1. A license may be revoked for failure to comply with
these Regulations. Revocation shall take place only
- 16 -
after a hearing before the Board of Health. The
license holder shall be given not less than ten (10)
r days' notice of the hearing and may be represented at
the hearing by counsel.
2. Written notice of -revocation particularizing the
violations shall be served upon the holder of the Systems
Contractor license. Service of notice as required in
this section shall be as provided by the Colorado Rules
of Civil Procedure, or by registered or certified mail,
return receipt requested, deliverable to addressee only.
3. The Board of Health shall from time to time set
qualification standards for licensed Systems Contractors.
3.22 Regulations of Systems Cleaners:
a. No person shall engage in the cleaning of sewage disposal
systems or the transportation of sewage to a disposal site
unless he holds a valid Systems Cleaner License. Employees
of a validly licensed Systems Cleaner shall not be required
to be licensed. The initial fee for a Systems Cleaner
license shall be $15 per year. Licenses shall expire on
December 31 of each year, and an annual renewal fee of
$5 shall be charged. A license which lapses because of
failure to renew or is revoked shall be subject to the
fee established for new license upon reapplication.
Application for a new license by a Systems Cleaner whose
license has been revoked shall not be considered for at
least one (1) year after revocation.
b. Standard of Performance for Systems Cleaners:
1. A license holder, when cleaning a septic tank or
aeration plant, shall remove the liquid, sludge and
scum, leaving no more than three (3) inches depth of
sewage in a non- backflowing septic tank or aeration plant.
In back - flowing types of systems, cleaning shall be
effective in reducing solids and scum to the point of
a near -new system.
2. A license holder shall maintain his equipment so as to
- 17 -
insure that no spillage of sewage will occur during
transportation and that his employees are not subjected
to undue health hazards.
3. A license holder shall dispose of the collected sewage
only at a site designated by the Eagle County Board of
Commissioners or by the Board of Health.
4. Prior to the issuance of or renewal of a license, the
Health Officer may require the applicant to demonstrate
adequate knowledge of paragraph 3.22(a), (b), and (c).
c. Revocation of a Systems Cleaner License: The procedures as
described in paragraph 3.21(c) shall be followed for the
revocation of a Systems Cleaner license.
3.23 Notice of Violation: Whenever the Health Officer determines
that there has been a violation of any provision of these Regu-
lations, he shall give notice of such violation to the responsible
person or persons. Such notice shall be in writing, and shall
particularize the violation(s), provide a reasonable time for
correction, and be addressed to the owner and occupant of the
property concerned. Service of such notice shall be provided
by the Colorado Rules of Civil Procedure, or by registered or
certified mail, return receipt requested, deliverable to addressee
only. Service by mail shall be complete upon receipt by the
Department of the return receipt. I£ one or more persons cannot
be found or served after a diligent effort to do so, service
may be made by posting a notice in a conspicuous place in or
about the property affected by the notice, in which case the
Health Officer shall include in the record a statement as to why
the posting was necessary.
3.24 Cease and Desist Order: The Health Officer may issue an order
to cease and desist from the use of any system which is found
by the Health officer not to be functioning in compliance with
these Regulations or which otherwise constitutes a nuisance to
public health and which has not received the timely repairs in
accordance with the provisions of paragraph 3.6. Such an order
may be issued only after a hearing which shall be conducted by
71:
1
the Health Officer not less than 48 hours after written notice
is given to the owner or occupant of the property on which the
system is located and at which the owner and occupant may be
present, with counsel, and be heard. The order shall require
that the owner or occupant bring the system into compliance or
eliminate the nuisance or hazard within a reasonable period of
time, not to exceed thirty (30) days, or thereafter cease and
desist from the use of the system.
3.25 Maintenance, Cleaning and Effluent Testing Schedules: In order
to insure good working order, the following minimum schedule
shall apply to all individual sewage disposal systems:
,TABLE 1
INSPECTION OR CLEANED OR ROUTINE EFFLUENT
TYPE OF TREATMENT MAINTENANCE PUMPED TESTING
(1)
Septic Tank
Every
4 years Every
4 years
Experimental only
(2)
Vault; privy
Every
4 years Every
4 years
None
(3)
Aeration plant
a. State waters
Every
6 months Every
8 years
As req'd by W.O.C.0
b. Surface discharge
Every
6 months Every
8 years
Every
6 months
c. Subsurface dispersal
Every
6 months Every
8 years
Every
6 months
d. Filter trench or bed
Every
6 months Every
8 years
Every
year
e. Absorption field
Every
year Every
8 years
Every
2 years
f. Non - discharge
Every
year Every
8 years
Every
2 years
(4)
Experimental systems shall
meet such
conditions as
are set
out
in the permit. The owner
shall be
responsible for
the required
maintenance and cleaning of
his system.
Samples may
be taken
at any time when necessary
to implement
paragraphs
3.23 and
3.24
of these Regulations.
3.26 Prohibition of Individual Sewage Disposal Systems in Unsuitable
Areas: The Board of Health may conduct a public hearing, after
written notice to all affected property owners as shown in the
records of the County Assessor, and publication of notice in a
newspaper of general circulation, at least ten (10) days prior
- 19 -
to the hearing, to consider the prohibition of permits for
individual sewage disposal systems in defined areas which contain
or are subdivided for a density of more than two (2) dwelling
units per acre. The Board of Health may order such prohibition --
upon finding that the construction and use of additional individual
sewage disposal systems in the defined area will constitute a
hazard to the public health. In such a hearing, the Board of
Health may request affected property owners to submit engineering
and geological reports concerning the defined area and to provide
a study of the economic feasibility of constructing a sewage
treatment works.
3.27 General Prohibitions: The following provisions specify general
prohibitions and are set forth for ease of reference but not
as guidelines herein:
(1) No city or town in Eagle County shall issue to any
person a permit to construct or remodel a building or
structure which is not serviced by a sewage treatment
works, until a permit for an individual sewage disposal
system has been issued by the Eagle County Environmental
Health Department.
(2) No city or town occupancy permit shall be issued to any
person for the use of a building which is not serviced
by a sewage treatment works until a final inspection of
the individual sewage disposal system has been issued by
the Eagle County Environmental Health Department, and
the installation has received the approval of same.
(3) No individual sewage disposal system presently in use
which does not comply with the provisions of Section
25- 10- 105(1)(e) regarding minimum separation between the
maximum seasonal level of the groundwater table and the
bottom of an absorption system shall be permitted to
remain in use after October 1, 1975, without compliance
with this article and the rules and regulations adopted
under this article.
(4) Construction of cesspools defined as covered underground
- 20 -
receptacles which receive untreated sewage from a
building and permit the untreated sewage to seep into
surrounding soil is prohibited.
(5) Not more than one (1) dwelling, commercial, business,
institutional, or industrial unit shall be connected
to the same individual sewage disposal system unless
such multiple connection was specified in the application
submitted and in the permit issued for the system.
(6) No person shall construct or maintain any dwelling or
other occupied structure which is not equipped with
adequate facilities for the sanitary disposal of sewage
without endangering the public health.
3.28 Penalties: Any person who commits any of the following acts
or violates any of the provisions of this article commits a
Class I Petty Offense as defined in Section 18 -1 -107, C.R.S.
1973, as amended:
(1) Constructs, alters, installs, or permits the use of
any individual sewage disposal system without first
having applied for and -received a permit as provided for
in these Regulations.
(2) Constructs, alters, or installs an individual sewage
disposal system in a manner which involves a knowing
and material variation from the terms or specifications
contained in the application or permit.
(3) Violates the terms of a cease and desist order which has
become final under the terms of these Regulations.
(4) Conducts a business as a Systems Contractor without
having obtained the license provided for in these
Regulations.
(5) Conducts a business as a Systems Cleaner without having
obtained the license provided for in these Regulations.
(6) Willfully fails to submit proof of proper maintenance and
cleaning of a system as required by these Regulations.
3.29 Jurisdiction: These Regulations are promulgated by the Eagle
County Board of Health under the authority of Chapter 25,
- 21 -
Article 10, C.R.S. 1973, as amended.
3.30 Severability: If any regulation adopted hereunder or its
application to any person or circumstances is held invalid,
unconstitutional, void, or inoperative, such holding shall not
affect other provisions or applications of these Regulations
adopted hereunder. The Board of Health hereby declares that
in these regards the regulations adopted hereunder are severable,
and that the Board of Health would have adopted the remaining
regulations hereof notwithstanding such holding.
3.31 Saving Clause: The repeal of any regulation adopted hereunder
shall not deny any right, action, or cause of action which arose
under existing regulations.
3.32 Effective Date: These Regulations shall become effective
45 days after final adoption.
SECTION IV: GENERAL TECHNICAL REQUIREMENTS
4.1 Calculation of Sewage Flow:
a. Where gallons per day and pounds of biochemical oxygen
demand (HODS) per day can be obtained by measurement of
existing conditions, such data shall be used.
b. For new facilities, the following "Table of Quantities and
BOD5 Strength of Sewage" may be used as a guide to represent
average conditions.
TABLE 2 TABLE OF QUANTITIES AND BOD5 STRENGTH OF SEWAGE
GALLONS /PERSON /DAY LBS. BOD PER
(Average) PERSON/ SDAY
(Unless Otherwise (Unless Otherwise
TYPE OF ESTABLISHMENT Stated) Stated)
Residential
Hotels & motels without private baths 50 .15
Hotels & motels with private baths 60 .15
Multiple family dwellings or apartments 75 .20
Rooming houses 50 .15
Single family dwellings 75 .20
22 -
v�
TABLE 2 - continued
TYPE OF ESTABLISHMENT
Commercial & Miscellaneous
Airline catering
Airports (not including food)
Airports
Bus service areas (not including food)
Country clubs (not including food)
Day workers at offices
Drive -in theatres (not including food)
Factories and plants (exclusive of
industrial wastes
Laundries, self - service
Food service establishments
(toilet and kitchen wastes)
Food service establishments
(kitchen wastes)
Food service establishments
(with paper service)
Additional for bars & cocktail lounges
Movie theatres - Churches
GALLONS /PERSON /DAY
(Average)
(Unless Otherwise
Stated)
3 gal /meal served
5 gal /passenger
10 gal /employee /day
5
30
15
10 gal /space /day
j 35
400 gal /washe.r /day
10 gal /patron /day
3 gal /meal served
3 gal /meal served
2
LBS. BOD PER
PERSON /S DAY
(Unless Otherwise
Stated)
03 lbs /meal served
02 lbs /passenger
06 lbs /employee /day
.02
.02
.06
06 lbs /space /day
RM
2.00 lbs /washer /day
.06 lbs /meal served
.03 lbs /meal served
.01 lb /meal served
.02
(not including food) 5 gal /seat /day .03 lbs /seat /day
Stores 400 gal /public toilet /day 2.00 lbs /public toilet /da
Work or construction camps
(semi - permanent) with flush toilets 50 .17
Work or construction camps
(semi - permanent) without flush toilets 35 .02
Travel trailer parks with individual
water & sewage hook -ups 100 gal /unit /day .50 lbs /unit /day
Travel trailer parks without individual
water & sewage hook -ups 50 gal /unit /day .17 lbs /unit /day
Institutional
Hospitals
Institutions other than hospitals
Mobile home parks
Schools, boarding
Schools, day (without cafeterias,
gym, or showers)
Schools, day (with cafeterias,
gym, or showers)
Schools, day (with cafeterias,
gym, and showers)
Recreational & Seasonal
Camps, day (no meals served)
Camps, luxury resort
250 gal/bed space /day
125 gal./bed space /day
100
100
15
20
25
15
125
- 23 -
20 lbs /bed space /day
17 lbs /bed space /day
.20
.17
.04
.08
.10
.12
.17
TABLE 2 - continued
GALLONS /PERSON /DAY
(Average)
(Unless Otherwise
TYPE OF ESTABLISHMENT Stated)
Camps, resort (night & day)
with limited plumbing
14.7
50
Camps, tourist, trailer or campground
100
gal /unit /day
Cottages & small dwellings
1.4
Laundry washer
(seasonal occupancy)
Lavatory
50
Country club
24.8
Shower
500
gal /fixture /day
Bath
300
gal /fixture /day
Lavatory
100
gal /fixture /day
Toilet
150
gal /fixture /day
Urinal
100
gal /fixture /day
Sink
50
gal /fixture /day
Public park (during hours when park is
open)
Flush toilet
36
gal /fixture /hour
Urinal
10
gal /fixture /hour
Shower
100
gal /fixture /hour
Faucet
15
gal /fixture /hour
Swimming pools & bathhouses
10
Separate Flow - Residential Use
Bath /shower
14.7
Dishwasher
1.8
Kitchen sink
4.4
Additional for garbage grinder
1.4
Laundry washer
19.5
Lavatory
8.4
Water closet
24.8
LBS. DOD PER
PERSON/ DAY
(Unless Otherwise
Stated)
.12
50 lbs /unit /day
17
.48 lbs /fixture /day
.29 lbs /fixture /day
.25 lbs /fixture /day
.18 lbs /fixture /day
.06 lbs /fixture /day
.51 lbs /fixture /day
.04 lbs /fixture /hour
.01 lbs /fixture /hour
.10 lbs /fixture /hour
.04 lbs /fixture /hour
.06
.014
.002
.045
.052
.037
.021
.029
C. Maximum flow shall be considered as 150 percent of average
flow and shall be the basis for design purposes unless
otherwise established by evidence satisfactory to the
Health Officer.
d. To calculate the sewage flow for dwellings and mobile homes,
use a figure of 3.5 persons per dwelling unit or at least
two (2) persons per bedroom.
e. In no event may the system be designed for a lesser
capacity than the anticipated maximum daily sewage flow
or treatment requirements of the sewage or wastes in the
system.
- 24 -
J
4.2 Minimum Horizontal Distances Between components of a System
and Physical Features:
a. Minimum horizontal distances from the various components
of a system to pertinent terrain features, including
streams, lakes, water courses, springs, wells, subsoil
drains, cisterns, water lines, suction lines, gulches,
dwellings, other occupied buildings and properly lines,
shall be in accordance with the following "Table of
Minimum Horizontal Distances in Feet Between Components
of a Sewage Disposal System Installed After November 15,
1973, and Pertinent Physical Features."
b. New wells, springs or potable water supply suction lines
and all other constructed units listed in the "Table"
shall be installed or located in accordance with the
minimum distance requirements provided in the "Table"
on the following page.
- 25 -
uun
tt rtr
Where suitable soils are
encountered on slopes of
less than 30%, the minimum
horizontal distance required
shall be 100 ft.
TABLE 3
TABLE OF MINI !UN HORIZONTAL DISTANCES IN
FEET BETWEEN COMPONENTS OF A SEWAGE DISPOSAL SYSTEM
INSTALLED AFTER NOVEMBER 15, 1973, AND PERTINENT PHYSICAL FEATURES
Dispersal System
* **
* **
* **
Uttilizing Aerosol Methods
200
10
50
125
10
0
30
10
/
rSeepage Pit or Slit
' **
Trench n
X200
50
25
20
25
Absorption Trench, Seepage
d15
±511
Bed, Sand Filter, or Sub-
surface Dispersal System #!ff
200
25
25
20
10
Unlined Sand Filter in
Soil With a Percolation
Rate Slower Chan 60
Minutes per Inch !1 tt
f#200
25
25
15
10
25
30
15
Unlined or Partially Lined
Evapotranspiration System,
Wastewater Pond, or Surface
Disposal System Other than
Aerosol
200
25
25
15
10
25
30
15
Lined Sand Filter
100
10
25
15
10
LO
30
10
Lined Evapotranspiration
Field or Lined Wastewater
Pond
100
10
25
15
10
10
30
10
Pit Privy or Vault Privy
or Vault
100
10
25
15
10
10
30
10
Septic Tanks, Treatment
Plants, Dosing Tanks or
**
**
*
**
**
**
**
Effluent Lines
50
10
25
5
10
10
50
10
**
**
**
**
**
Building Sewer
50
10
25
0
0
10
50
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NOTE: The minimum distances shown above shall be maintained between the system
components and the physical features described. Where soil, geological or other
conditions warrant, greater distances may be required by the Water Qualicy Control
Commission pursuant to C.R.S. 1973, 25 -B -206. For repair or upgrading of
existing systems where the size of lot precludes adherence to these distances,
repaired facility shall not be closer to water supply components than the
existing facilities.
* Components which are not watertight should not extend into areas of the root
system of nearby trees. Distance shown shall not apply to treatment plants or
effluent Lines where recycling is permitted.
** Crossings may be permitted where pipelines are constructed of sufficient strenp-
to contain flows under pressure.
*_* Add R feet additional distance for each 100 gallons per day of design flow over —'
1000 gallons per day.
ADDITION' for areas with water table less than 20 ft. below the surface or
greater than 7 ft. below the surface or in areas of fractured or jointed bedrock
within 10 £[. of ground surface and in areas where the percolation rate exceeds
5 mina per inch or faster than 12 inches per hour.
25a -
SECTION V: SOIL TEST
5.1 Location: Soil percolation tests shall be performed in at
least three (3) test holes in the area in which the absorption
system is to be located, spaced uniformly over the proposed
site, except there shall be no less than one (1) test hole
in any twelve hundred square foot (1200 sq. ft.) area of the
absorption system.
5.2 Dimensions:
a. The percolation test holes shall be from 4" to 12" in width
or diameter, and shall be 3 feet deep + six (6 ") inches.
b. One soil profile test hole at least eight feet (8') deep
or to bedrock, whichever is first reached, must be completed
to give an indication of the soil condition in the area
including that soil zone at least 4 feet below the bottom
of the proposed absorption system.
5.3 Procedure: Percolation test holes in soil that is not frozen
shall be filled with water to a depth of 14 inches or more
at least 8 hours prior to making the water percolation test,
and shall be refilled with water if necessary to a depth of
at least 14 inches prior to final measurement. From a fixed
reference point, measure the time for water to drop one inch
within the lower 250 depth of the percolation test hole. The
percolation rate shall be reported in minutes of time per inch
drop (MPI). The field percolation rate shall be the average
rate of the percolation test holes after the rate has stabilized
in all the test holes observed in the proposed absorption area.
The field percolation rate shall be used in calculating the
absorption area required for the proposed system. A rate faster
than 5 minutes per inch (5 MPI) and slower than 60 minutes per
inch (60 MPI) shall render the location unsuitable for an
absorption system. Sites with unsuitable percolation rates
t
shall necessitate additional soil evaluation and design by a
Registered Professional Engineer if an absorption system is to
be proposed.
- 26 -
r
5.4 Performance of Percolation Tests:
a. The percolation test shall be performed by or under the
supervision of a Registered Professional Engineer or by a
competent technician of the Environmental Health Department
unless the tests were previously performed by a Registered
Professional Engineer and the results thereof submitted with
the application for the permit.
b. If the applicant demonstrates to the satisfaction of the
Environmental Health Department that the system is not
dependent upon soil absorption, the requirement for percolation
tests may be waived.
5.5 Alternate Percolation Test: Alternate percolation test procedures
may be approved providing the test results of alternate procedures
are substantially equivalent to those determined using the test
procedure detailed in this section.
5.6 Location of the Groundwater Table:
a. Direct visual observation of infiltrated water at the maximum
seasonal elevation in an 8 -foot boring;
b. Observation of soil in a trench of at least an 8 -foot depth
for evidence of crystals of salts left by groundwater table;
or chemically reduced iron in the soil, reflected by a dull
gray or mottled coloring;
C. Soil moisture tests indicating water saturation;
d. Determination of the piezometric surface by hydraulic
gradient;
e. Or by other scientific methods approved by the Board of Health.
5.7 A suitable soil shall meet the following criteria:
a. Has at least a 4 -foot depth or permeable stratum;
b. Is located without the maximum seasonal groundwater table;
C. Has the capacity to adequately disperse the designed effluent
loading as determined by a field percolation rate between
5 MPI and 60 MPI, or by other approved soil tests;
d. Does not exhibit inhibiting swelling characteristics;
e. Does not visibly exhibit a jointed or fractured pattern of
- 27 -
an underlying bedrock;
f. Is not consolidated;
g. Acts as an effective filter within its depth for the removal
of pathogenic organisms and suspended solids.
SECTION VI: COMPONENT DESIGN CRITERIA (GENERAL)
6.1 Reliability: Individual sewage disposal systems shall be
designed and constructed such that each component shall function
when installed and operated in a manner not adversely affected
by the normal operating conditions including erosion, vibration,
shock, climatic conditions, and usual household chemicals used.
Each component shall be free of non - functional protrusions or
sharp edges, or other hazards, which could cause injury to
persons, animals, or properties. Design shall be such as to
exclude flies and rodents and to prevent the creation of nuisances
and public health hazards. Design shall provide for efficient
operation and maintenance.
6.2 Plumbing Codes: Plumbing fixtures, grease traps, building sewers,
vents, sewer lines and other appurtenances shall be designed,
operated, and maintained so as to comply with the minimum
requirements of the 1972 Colorado Technical Plumbing Code in
force on the effective date of these guidelines or those revisions
of said Code as are adopted by the State Board of Health or the
Uniform Plumbing Code adopted by Eagle County, whichever Code
is more restrictive. Where conflict exists, the County will
normally use the Uniform Code adopted by the County.
6.3 Electrical Equipment, if used: All electrical work, equipment,
and material shall comply with the requirements of the 1978
National Electrical Code in force on the effective date of these
guidelines, or those revisions of said Code as are adopted by
the State Electrical Board.
6.4 Identification and Data Marking: A permanent type plate or other
indelible marking on major components not constructed on the site
where installed shall be provided, so inscribed as to be easily
28 -
read and visible for the purpose of inspection. Said inscription
shall include the following:
Name of manufacturer;
Model or serial number designation;
Maximum design capacity of the unit and the
unit of measurement.
6.5 Structural Integrity: Tanks shall be so constructed and installed
so as to withstand earth and hydrostatic pressures when full and
when empty. Metal or metal - coated tanks are not approved.
Other materials which result in an adequate and durable construction
and which resist excessive corrosion or decay may be approved.
6.6 Watertight Requirement: Watertight tanks, vaults, or other
units shall not allow infiltration of groundwater or surface
water and shall not permit the release of wastewater or liquids
therefrom through other than designed openings.
6.7 Accessibility for Inspection and Maintenance: Each treatment
unit shall be equipped with an access manhole located to permit
periodic physical inspection, collection, and testing of samples
and maintenance of all components and compartments including
but not limited to submerged bearings, moving parts, tubes,
intakes, slots, filters, inlet and outlet baffles, and other
devices.
6.8 Indicators of Failure for Systems Utilizing Mechanical Apparatus:
A signal device shall be installed which will provide a recog-
nizable indication or warning to the user that the system or
component is not operating or is operating but malfunctioning.
This indication or warning shall be in the form of a visual or
audible signal, or both.
6.9 Serviceability: Components shall be so designed and constructed
that when installed in accordance with manufacturer's recommenda-
tions, they shall be capable of being easily maintained, sampled,
drained, pumped, inspected, and cleaned.
6.10 Sampling Access: Where a required final effluent sample cannot
be easily obtained, a sampling well shall be constructed. The
sampling well shall be accessible and provided with a properly
- 29 -
f
secured cover.
6.11 Instructions: The manufacturer shall provide clear, concise
instructions covering the unit which, when followed, will assure
proper installation and safe and satisfactory operation.
6.12 Surface Activity: The surface of the ground over the individual
sewage disposal system or any part thereof, must be restricted
to activity or use which will permit the system to function as
designed and which will not contribute to compaction of the soil
nor to structural loading detrimental to the capability of the
component to function as designed.
6.13 Distribution Box: A distribution box is not recommended, but if
used, shall be of sufficient size to accommodate the necessary
field lateral lines and shall be constructed with the inlet invert
at least one (1) inch above the level of the outlet invert. The:
outlet invert shall be three (3) to six (6) inches above tte
floor of the distribution box.
6.14 Sewage Pumping System Where Applicable:
a. Non -clog pump opening shall have at least 2 -inch diameter
solids handling capacity where raw sewage is pumped or at
least 3/4 inch diameter solids handling capacity if previously
settled effluent is pumped.
b. Automatic liquid level controls shall be provided to start
and shut off pumps at a frequency required by the design.
C. Pressure pipe shall be of sufficient strength to accommodate
pump discharge pressure and the pipe shall be sized to maintain
a velocity of 2 or more feet per second.
d. Automatic air release valves shall be installed at high
points in the pressure line where necessary to prevent air
locking.
e. A storage basin preceding the pump shall be provided to
allow pump cycling commensurate with pump design capacity.
SECTION VII: COMPONENT DESIGN CRITERIA (FIRST STAGE TREATMENT UNITS)
7.1 Septic Tank
a. A septic tank shall be constructed to permit detention of
- 30 -
TABLE 4
incoming sewage for a minimum of thirty (30) hours, or the
capacity shall be based upon the number of bedrooms according
to the following table:
SEPTIC TANK SIZE BASED UPON NUMBER OF BEDROOMS
Number of Bedrooms
2 or less
3
4
Each additional
Minimum Effective Liquid
Tank Capacity (gallons)
750
1000
1250
250 each
b. Septic tank design criteria:
1. Except for mini - systems the effective liquid capacity
shall be no less than 750 gallons.
2. Inlet invert shall be 3 inches higher than the outlet
invert.
3. Outlet tee or baffle shall extend above the surface of
the liquid to within one inch of the underside of the
tank top and shall extend at least 14 inches below
the outlet invert.
4. The distance from the outlet invert to the underside of
the tank tcp shall be at least 10 inches.
5. Liquid depth shall be a minimum of 30 inches and the
maximum depth shall not exceed the tank length or
60 inches, whichever is less.
6. A septic tank shall have two or more compartments or
more than one tank may be used in series to provide the
following capacity arrangement: The first compartment of
a septic tank shall hold no less than 1/2 of the required
effective capacity.
7. The transfer of liquid from the first compartment to
the second or successive compartment shall be made at
a liquid depth of at least 14 inches below the outlet
invert but not in the sludge zone.
- 31 -
- 32 -
8. At least one access no less than 20 inches across shall be
provided in each compartment of a tank.
9. The opening cover of a septic tank manhole, inspection port,
or sampling access port shall be no deeper than 8 inches below
the finished grade.
F' c.
Cast iron pipe or pipe of equal strength (e.g., heavy -duty PVC pipe
t
- ASTM 3034 - may be used in place of cast iron) or other pipe
properly supported (The words "properly supported" shall include
but not be limited to, that pipe surrounded by compacted fill,
encased in concrete, or metal reinforcement of the pipe may be
used upon approval of the Department if the proposed method is
capable of preventing failure by settling or tank displacement.) to
prevent failure by settling shall extend from the septic tank for
a distance of at least five (5) feet from the inlet and outlet ends.
7.2 Aerobic Sewage Treatment System:
a.
General Design: The shape and design of an aeration compartment,
its inlet and outlet arrangements, baffling and air application
shall:
1. Allow for intimate mixing of applied sewage, return solids,
and applied air.
2. Prevent excessive short circuiting of flow.
3. Prevent the deposit and build -up of solids in the aeration
compartment.
b.
Method of Aeration: The method of aeration shall be accomplished
by mechanical aeration, diffused air, or a combination of these.
The method of aeration shall at all times maintain aerobic conditions
at the maximum organic loading in both the aeration and settling
compartments.
7.3 Installation
of Septic Tanks
a.
Tanks are to be installed on a solid base and shall be level.
The tank shall be installed with removable covers or manholes
extended to within 8 inches of finished grade in order to provide
access tc the inlet and outlet devices of each compartment for
')
cleaning and inspection. Roof drains, foundation drains, area
,.�.,
drains, or cistern overflows are not to enter the tank or any
part of the treatment system.
b.
The building sewer line to septic tank shall be laid with
a minimum fall of 1 /8th inch per foot (1 /4th inch fall /ft.
- 32 -
�j
is recommended). Bends in the building sewer shall be
limited to 45 degree ells, or long -sweep quarter- bends.
Cast iron pipe is required whenever the building sewer is `
located under a driveway. The building sewer installation
shall meet all of the requirements of the Colorado Technical
Plumbing Code, 1972 Revised. The inlet and outlet pipes
shall be grouted and sealed with waterproof materials.
C. Backfilling around a septic tank shall be accomplished
in a manner to prevent settlement and avoid undue strain
on the tank and the pines entering and leaving the tank.
d. Abandoned septic tanks and vaults shall be pumped and
filled with soil or they shall be removed.
SECTION VIII: COMPONENT DESIGN CRITERIA (SECOND OR LATER STAGE TREATMENT
UNITS)
8.1 Soil Absorption System (General)
a. For a system treating and disposing of effluent through a
soil absorption system, the method for calculating minimum
absorption area shall be based upon the amount of suitable
soil and the capacity of the soil to absorb liquids as
established by the percolation test and upon design criteria
and construction standards for such type of absorption
system.
b. Unless designed by a Registered Professional Engineer and
approved by the Eagle County Board of Health,* no such
system may be permitted in areas under any of the following
conditions:
1. where the soil percolation rate is slower than one inch
in 60 mins. (1 inch /hr) or faster than one inch in 5
mins. (12 inches /hr) except that a percolation rate faster
* Except that such approval may be given by the Eagle County Board of
Health if authorized by regulations for such systems treating exclusively
domestic wastes.
- 33 -
}
r�
than one inch in 5 mins. (12 inches/hr) in soils of
sandy texture shall be permitted, or the percolation may
be slowed by soil treatment.
2. Where the maximum seasonal level of the groundwater
table is less than four (4) feet below the bottom of the-
proposed absorption system.
3. Where bedrock exists less than four (4) feet below
the bottom of the proposed absorption system.
4. Where the ground slope is in excess of 30 percent.
C. Soil building or replacement will be permitted to bring
the soil within the requirements of suitable soil. Refer
to sections of these Regulations and other suitable engineering
criteria for compaction, depth, volume, density, etc.
d. Absorption Area: The minimum absorption area in square
feet (A) for an individual sewage disposal system shall be
determined as a function of the estimated quantity of sewage
flow in gallons per day (Q) and the percolation rate in
minutes per inch (t), A - Q x
according to the formula:
NOTE: Where the percolation rate is found to be faster than
5 MPI in soils of sandy texture, the minimum value of "t"
for use in this formula shall not be less than "5 ".
e. Additional Area: The absorption area so calculated shall
be increased by not less than an additional 20 percent if
wastes from a garbage grinder are discharged into the system
and by not less than an additional 40 percent if wastes
from an automatic washing machine are discharged into the
system.
- 34 -
TABLE 5
-fl
5i
SUB - SURFACE ABSORPTION AREA FOR DWELLING USE
If the Percolation
Rate is: (Minutes
for water to fall
1 inch)
5 mins per inch
10 mins per inch
15 mins per inch
30 mins per inch
45 mins per inch*
60 mins per inch **
Over 60 mins
The minimum Absorption Trench
Area is: (Square feet of trench
bottom per bedroom)
125 sq. ft. of trench /bedroom
165 sq. ft. of trench /bedroom
200 sq. ft. of trench /bedroom
250 sq. ft. of trench/bedroon
300 sq. ft.
350 sq. ft.
Not permitted
The minimum Absorptic'
Area Seepage Bed:
JSquare feet of bottom
of bed peg bedroom)
165 sq. ft. /bedroom
215 sq. ft. /bedroom
260 sq. ft. /bedroom
325 sq. ft. /bedroom
Not permitted
Not permitted
Not permitted
* Subsurface absorption fields with seepage beds are not permitted in soils
with percolation rates over 30 mins per inch drop. Two- compartment tanks
or units in series are required.
** Subsurface soil absorption systems are not permitted in soils with perco-
lation rates over 60 mins per inch drop.
f. Where absorption systems are to be installed in new fill
material, the fill must be designed or tested by a
Registered Professional Engineer.
g. The final grade shall be such that surface water drainage
will be directed away from the absorption system.
h. Seepage beds absorption areas shall be calculated at 1.3
times the absorption area required for absorption trenches.
i. Adjustment for Deep Gravel: The length of an absorption
trench or seepage bed may be calculated by allowance for the
sidewall area of additional depth of gravel in excess of
6 inches below the bottom of the distribution pipe according
to the following formula:
length required
Calculated _ prior to W + 2
length adjustment x W + 1 + 2d
Where: W = width of field in feet
d = depth of gravel below distribution
pipe in feet
- 35 -
_ 5
j. The ground surface shall be graded to deflect precipita-
tion or other outside water from the disposal area. The
absorption area shall be protected against erosion.
k. The perforated pipe in the drain field (County system only)
shall be at least 6 inches below the outlet invert of the
septic tank.
8.2 Absorption Trench
a. At least 2 trenches of near equal length shall be constructed
with a length not exceeding 100 feet; a width not exceeding
3 feet; and a depth not exceeding 3 feet (unless approved
by the Stealth Officer). A minimum 3 -inch diameter disposal
line shall be provided for each trench and shall be surrounded
by clean, graded gravel or rock, broken hard burned clay brick,
or similar aggregate. The material may range in size from
1/2 inch to 2 -1/2 inches. Cinders, broken shell, and similar
material are not recommended. The material shall extend
from at least 2 inches above the top of the pipe to at
least 6 inches below the bottom of the pipe. The top of the
gravel shall be covered with untreated building paper, a thin
2 inch layer of hay or straw, or similar pervious material
to prevent the gravel from becoming clogged by earth backfill.
An impervious covering shall not be used, as this interferes
with evapotranspiration at the surface. A distribution
device providing uniform distribution shall be included. The
bottom of the trench and the distribution lines shall be
level or graded to comply with (b) below.
b. Disposal lines composed of 12 inch lengths of 4 inch diameter
agricultural drain tile, concrete pipe or vitrified clay
sewer pipe shall provide joint openings between lengths of
,v.. pipe of 1/8 to 1/4 inch in width. Each open joint shall be
covered over the upper half of the joint opening. Perforated
plastic lines of a minimum 3 inch diameter shall be fitted
with tight joints and the performations shall be so laid that
- 36 -
1� 3
a relatively even distribution of effluent over the system
will occur. When, at the discretion of the Health Officer,
it is necessary to maintain grade or alignment of the tile
or pipe lengths, all tile or pipe lengths shall be placed on
narrow grade boards which are securely staked. The grade of
pipelines shall be from zero (0) inches to 4 inches per
100 feet.
c. A final cover of soil suitable for vegetation at least
10 inches deep shall be placed from the top of the hay,
straw, or other similar pervious material to the finished
surface grade of an absorption trench or seepage bed. The
final cover shall be graded to deflect runoff water away
from the disposal area. In the case of an above- ground
system, such as a mounded system, an impervious berm shall
be constructed to prevent lateral flow of waste discharge
outside of the absorption field. Machine tamping, rolling,
or hydraulic compaction of final cover shall not be permitted;
however, hand tamping may be allowed where necessary to
stabilize the soil to prevent erosion or the intrusion of
extraneous water.
8.3 Seepage Beds
a. Seepage beds shall be constructed with a length not exceeding
100 feet; a width not greater than 3 feet; and a depth not
exceeding 3 feet (unless approved by the Health Officer). A
12 -inch layer of 1/2 inch to 2 -1/2 inch washed gravel shall
be distributed evenly over the entire bed, with pipelines
set at a depth to insure at least 6 inches of gravel below and
2 inches of gravel above each line. The bottom of the bed
shall be level. A covering of untreated building paper,
straw, or similar material, shall be placed on top of the
gravel, and after final inspection, backfill shall be placed
over the bed to a minimum depth of 10 inches. The bottom in
the bed and distribution lines shall be laid level or up
to a 4 -inch drop in 100 feet.
- 37 -
b. The outermost disposal lines in the bed shall be placed no
less than 18 inches and no more than 36 inches from its
outside bedwalls. For each 6 feet or part thereof, in bed
width, there shall be one disposal line extending the length
of the bed. Such lines shall be so placed as to distribute
the effluent evenly over the entire bed area, and shall be
level or unto a 4 -inch drop in 100 feet. A distribution box
or other distribution device providing uniform application
of flow shall be included in the seepage bed system.
8.4 Seepage Pits
a. Seepage pits are permitted as an alternative only when
absorption fields are impractical and where the top 3 or 4 feet
of soil is underlaid with porous sand or fine gravel and the
subsurface conditions are otherwise suitable for pit
installation.
b. Where circumstances permit, seepage pits may be either
supplemental or alternative to the shallow absorption
fields. When seepage pits are used in combination with
absorption fields, the absorption areas in each system shall
be pro- rated, or based upon the weighted average of the
results of the percolation tests. The minimum absorption
area shall be the equivalent for a two - bedroom dwelling. The
capacity of the seepage pit shall be computed on the basis
of percolation tests made in each vertical stratum penetrated.
The weighted average of the results shall be computed to
obtain a design figure. Soil strata in which the percolation
rates are in excess of 30 MPI shall not be included in
computing the absorption area or seepage pit. The effective
area of the seepage pit is the vertical wall area (based on
dug perimeter) of the pervious strata below the inlet. No
allowance shall be made for impervious strata or bottom area.
Seepage pits shall be separated by a distance equal to
3 times the greatest diameter of the largest pit. For pits
over 20 feet in depth, the minimum space between pits shall
�I�
be 20 feet. Pits shall be provided with both vertical
sidewall and top supporting structural concrete or other
material of equal structural integrity. Adequate safety
protection shall be provided to protect against personal
injury during construction or use.
C. When percolation rates exceed 20 MPI, dual seepage pits
provided with a diversion valve shall be required unless
waived by the Health Officer on submission of justifying
data.
d. The excavation of a seepage pit shall terminate at least
10 feet above the groundwater table.
e. The walls shall be made of concrete block, brick, perforated
concrete rings or other suitable masonry material. Mortar
shall be used in the horizontal joints only. A removable
cover or manhole shall be provided. The annular space
between the excavation and the outside wall shall be filled
with clean coarse gravel. The bottom 1 foot of the pit should
be filled with clean, coarse gravel.
8.5 Serial Distribution System: A serial distribution system may
be used in all situations where a soil absorption system is
permitted and shall be used where the ground slope does not
allow for suitable installation of a single level absorption
field. The horizontal distance from the side of the absorption
system to the surface of the ground shall be adequate to
prevent lateral flow and eruption of effluent above ground.
When a serial distribution system is used, the following design
and construction procedures shall be followed:
a. The bottom of each absorption field and its distribution
line shall be level.
b. There shall be a minimum of 10 inches of ground cover over
the gravel fill.
c. An absorption field shall follow approximately the ground
surface contours so that variation in absorption field depth
will be minimized.
- 39 -
d. There shall be a minimum of 6 feet (horizontal)
measurement) of undisturbed earth between adjacent
absorption field trenches and between the septic
tank or other treatment unit and the nearest
absorption field.
8.6 Evapotranspiration Disposal of Effluent: An evapotranspiration
system may be used exclusively or in combination with a soil
absorption system.
a. An evapotranspiration system shall be designed by a
Registered Professional Engineer who shall furnish
design data for a complete review of the design.
b. Data to be furnished shall include, but shall not
be limited to: liner material and bedding, properties
of the soil in the evapotranspiration bed, and pro-
vision for vegetation cover.
C. when high groundwater table, bedrock, fractured rock, or
highly pervious material (percolation faster than 5 MPI)
endangers the underground water, a durable and impermeable
liner shall be installed in the bed to prevent the
sewage effluent from entering the underlying formation
or groundwater table.
- 39a -
HE
r
d. An evapotranspiration system shall be located in an
area where there is exposure to sunshine.
e. The system bed shall be crowned and covered with a minimum
of 4 inches of selected backfill material and with a vegetation
cover.
f. Bed area shall be protected to prevent damage from vehicular
or pedestrian travel. The ground surface shall be graded
to deflect precipitation and other outside water away from
the disposal area.
g. The following formula may be used as a minimum guide for
determining the area necessary for total evapotranspiration
of septic tank effluent:
Flow (in gallons /day) x 237
Area (in sq. ft.) - Lake Evaporation Rate at the
Site (in inches /year)
NOTE: Except for dwellings, if the system is designed for
summer use only, as determined by the Environmental Health
Department, multiply the above area by 0.6 to obtain the
required area.
Sand Filter
a. The filtering material shall be clean, coarse sand, all
passing a screen having four (4) meshes to the inch. The
sand shall have an effective size between 0.25 and 0.6 mm.
The uniformity coefficient shall be 4.0 or less.
b. The sand shall be at least 2 feet deep. The distributors
and underdrain, if required by the Eagle County Board of
Health, shall be surrounded by coarse screened gravel or
crushed stone. All of the gravel or stone shall pass a
2 -1/2 inch screen and shall be retained on a 3/4 inch
screen. Fine gravel 1/4 inch size or less may be used
above and around the coarse material, both at the distributor
and underdrains. The separating distance between parallel
distribution lines shall not exceed 6 feet, and a distribution
c. The minimum area for a sand filter shall be computed as a
function of the maximum daily sewage flow according to
the following table:
LOADING RATES FOR A SAND FILTER
Application Rate
Gallons per
Type of Service Square Foot /Day
Without garbage grinder 1.15
With garbage grinder 0.95
d. A dosing tank shall be provided where the total filter
area exceeds 1,800 sq. ft. The size of the dose, or the
net capacity of the dosing tank, shall be at least 75% of
the volume of the distributors.
8.8 Wastewater Pond
a. A wastewater pond shall be discouraged; however, it may be
permitted only upon application to and approval of the
Eagle County Board of Health and may be used to provide an
additional degree of treatment following first stage
treatment. The pond shall be designed for a loading not
to exceed 0.46 lbs. of B0D5 per 1,000 sq. ft. of water
surface area. Special design shall be required in each
case in which non - domestic kinds of individual sewage
disposal system wastes will be received.
- 41 -
line shall be located within 3 feet of each filter sidewall.
Pipe for gravity distribution shall be no less than 4 inches
in diameter. The slope of the distributors shall be
i.
0.4 percent where dosing tanks are not used, and the slope of
the underdrains 0.5 to 1.0 percent. It is required that
the sand be thoroughly settled by flooding or other means
before the distributors are placed at the final grade. The
distributor and underdrains may be of agricultural tile, or
bell and spigot pipe, or perforated pipe. The top of the
sand bed shall be no less than 4 feet above the high
groundwater table for installations in which effluent perco-
lates downward through the soil.
c. The minimum area for a sand filter shall be computed as a
function of the maximum daily sewage flow according to
the following table:
LOADING RATES FOR A SAND FILTER
Application Rate
Gallons per
Type of Service Square Foot /Day
Without garbage grinder 1.15
With garbage grinder 0.95
d. A dosing tank shall be provided where the total filter
area exceeds 1,800 sq. ft. The size of the dose, or the
net capacity of the dosing tank, shall be at least 75% of
the volume of the distributors.
8.8 Wastewater Pond
a. A wastewater pond shall be discouraged; however, it may be
permitted only upon application to and approval of the
Eagle County Board of Health and may be used to provide an
additional degree of treatment following first stage
treatment. The pond shall be designed for a loading not
to exceed 0.46 lbs. of B0D5 per 1,000 sq. ft. of water
surface area. Special design shall be required in each
case in which non - domestic kinds of individual sewage
disposal system wastes will be received.
- 41 -
{
b. Maximum water depth in the pond shall not exceed 3 feet.
The inside slope of the pond, dike, or embankment shall not
be steeper than 3:1 (3 ft. measured horizontally for each
1 ft. measured vertically). A center inlet shall be provided.
C. Unless constructed in impervious soil, the pond shall be
sealed to prevent excess seepage of wastewater.
d. Adequate safety protection shall be provided, such as
fencing, to protect against personal injury.
e. Surface runoff shall be diverted away from the pond except
where controlled by design.
SECTION IX: DESIGN CRITERIA (OTHER FACILITIES)
9.1 Mini - System: A mini- system shall meet at least all minimum
design and construction standards for a septic tank system based
on the amount and character of wastes for the fixtures and the
number of persons to be served.
9.2 Vault: A vault shall have a minimum 1,000 gallon effective
capacity and may be permitted under limited use occupancy
for water carriage sewage systems on property which cannot
accommodate a sewage treatment system. A signal device shall
be installed to indicate when pumping is necessary. Vaults
shall meet the same installation and construction standards as
apply to septic tanks except that no effluent outlet shall be
provided.
9.3 Vault Privy: A vault privy shall be built to include:
a. fly -tight construction;
b. a superstructure affording complete privacy;
C. an earth mound around the top of the vault and below floor
level which slopes downward away from the superstructure base;
d. a floor and riser of concrete or other impervious material; and
e. seats and covers of easily cleanable, impervious material,
hinged, self - closing and fly - proof.
- 42 -
All venting shall be fly - proofed with No. 16 or tighter mesh
screening. Effective capacity of the vault shall be no less
than 400 gallons.
9.4 Pit Privy: A new pit privy constructed in soil may be permitted
only a) upon approval of the Eagle County Board of Health, and
b) for temporary or emergency basis not to exceed 14 days use.
It shall be built to include fly -tight construction; a super-
structure affording complete privacy; an earth mound around the
top of the compartment and below the floor level, which slopes
downward away from the superstructure base; a floor and riser
of concrete for other impervious material; and with seats and
covers of easily cleanable, impervious material, hinged, self -
closing and fly - proof. All venting shall be fly - proofed with
No. 16 or tighter mesh screening. Effective capacity of the pit
shall be no less than 400 gallons. Pit shall be located in
soil where the maximum seasonal level of the groundwater table
will be no closer than four (4) feet below the bottom of the pit.
9.5 Incineration and Chemical Toilets: An incineration toilet,
which may be used in connection with a mini - system by permit
from the Eagle County Board of Health, shall be designed and
installed in accordance with all applicable federal, state, and
local air - pollution requirements. A portable chemical toilet,
which may be used by permit from the Eagle County Board of Health,
shall have a superstructure which meets the requirements of the
paragraph 9.3 titled "Vault Privy." Use of a portable chemical
toilet in permanently occupied buildings shall be prohibited
except during construction or under emergency circumstances as
determined by the Environmental Health Department.
9.6 Slit Trench: A slit trench shall be approved for temporary
or emergency use as determined by the Eagle County Board of
Health and shall be located in suitable soil and shall be
excavated approximately one (1) foot ;aide and two (2) feet deep
for the required length. Excrement shall be covered with at
least two (2) inches of soil at least once a day or more frequently
- 43 -
s
if requested by the Eagle County Board of Health or its designated
agent. A superstructure of a temporary nature shall be provided
to afford privacy. A slit trench shall be considered a temporary
convenience to be used no longer than 7 days, and shall be
backfilled with at least 1 foot of soil with additional allowance
for settling to grade when use has been discontinued.
9.7 Business, Commercial, Industrial, Institutional, or Multi - Family
Dwelling Waste Systems:
a. Performance criteria and construction standards for a system
which will service business, commercial, institutional,
industrial property, or multi - family dwellings shall conform
to these Regulations.
b. Such systems shall be designed by a Registered Professional
Engineer. An application for such a system shall be reviewed
by the Eagle County Board of Health unless disposal is
through an absorption system and the wastes are exclusively
domestic type wastes, in which case review shall be by the
Environmental Health Department if authorized by regulations
of the Eagle County Board of Health for such systems.
9.8 Systems for Which Data on Design, Operation, and Maintenance,
based on use in Colorado, is Limited or Undetermined:
a. Composting Toilets
1. Deposits of feces, urine, and readily decomposible
household garbage that are not diluted with water or
other fluids may be retained in a compartment, in which
aerobic composting will occur. The compartment may be
located (a) so as not to cause nuisance problems and /or
odors; (b) where it is readily accessible for operation
and maintenance; (c) within a dwelling or building provided
the unit complies with the applicable requirements of these
Regulations, and provided the installation will not
result in conditions considered to be a health hazard.
The effective volume of the receptacle must be sufficient
to accommodate the number of persons served.
j 1
2. Adequate additional volume shall be provided for the
use of composting materials which shall not be toxic
to the process or hazardous to persons and which shall
be used in sufficient quantity to assure proper decompo-
sition.
3. Compartment and appurtenances related to the unit shall
include fly -tight construction and exterior mechanical
or gravity ventilation as required by the Plumbing Code.
4. When the available effective volume is filled to 750 of
capacity, residue from the unit shall be properly disposed
of by acceptable solid waste practices.
5. No composting toilet may be installed to serve more than
8 persons per system.
6. If a system will be installed where low temperature
may be a factor, design shall compensate for the
effects of the low temperature.
7. Manufactured composting toilets shall bear the seal of
approval of the National Sanitation Foundation, or an
equivalent testing program, and is otherwise approved by
the Department.
b. Systems Which Recycle Treated Wastewater for Non - potable
Purposes such as Flushing Water Closets or Urinals:
1. That portion of the wastewater recycled for non - potable
purposes such as flushing water closets or urinals must
meet the treatment requirements of paragraph 10.2 of
these Regulations for effluent in which the possibility
exists for occasional direct human contact.
2. No cross - connection to a pipe, fixture, or supply
containing potable water shall be permitted.
C. Systems Which Recycle Treated Wastewater for Potable
Purposes:
1. No system shall be permitted which will recycle wastewater
- 45 -
for potable purposes except a system which shall consistently
meet all of the sanitation and maximum contaminant level
requirements of rules, regulations, and standards of the
Colorado Department of Health and of the Eagle County
Board of Health.
2. The recycling systems are experimental, and, as such,
require a back -up feasibility plan for alternate water
and sewage disposal in the event of failure of the
recycling system.
SECTION X: TREATMENT SYSTEMS OTHER THAN THOSE DISCHARGING THROUGH A SOIL
ABSORPTION OR SAND FILTER SYSTEM AND NON - DISCHARGING SYSTEMS
10.0 General: Those systems which will discharge effluent directly
to the atmosphere, the ground surface or below ground, or which
employ aerobic principles of sewage treatment or a dispersal
system, may be permitted only if designed by a Registered
Professional Engineer. This Section X shall not apply to
systems discharging below ground through a soil absorption system
nor sand filter system nor to a non - discharging system.
10.1 Review of Application: The Eagle County Board of Health shall
review all applications for such systems which may result in
discharge or drainage of effluent from the property of origin.
No permit shall be issued for such a system if the Eagle County
Board of Health determines that a potential health hazard or
private or public nuisance or undue risk of contamination exists.
The Eagle County Board of Health may, by regulation, authorize the
Environmental Health Department to review applications and issue
permits for systems which do not permit the drainage of effluent
off the property of origin. For systems discharging to State
waters, see Section XII.
10.2 Minimum Performance Criteria Required:
a. If effluent discharge is made into the atmosphere or upon
the ground surface in areas in which the possibility exists
for occasional direct human contact with the effluent discharge,
the effluent at the point of sampling shall consistently
meet each of the following standards:
I
I 'IN 1. The fecal coliform density shall not exceed
2 per 100 milliliters (2/100 ml).
2. The standard BOD5 shall not exceed 20 milligrams per
liter (20 mg /1).
3. The total suspended matter shall not exceed 40 milligrams
per liter (40 mg /1).
b. If effluent discharge is made into the atmosphere or upon
the ground surface in an area so restricted as to protect
against the likelihood of direct human contact with the
discharged effluent, the effluent at the point of sampling
shall consistently meet each of the following standards:
1. The fecal coliform density shall not exceed 500 per 100
milliliters (500/100 ml).
2. The standard BOD5 shall not exceed 20 milligrams per
liter (20 mg /1).
3. The total suspended matter shall not exceed 40 milligrams
per liter (40 mg /1).
C. If effluent discharge is made beneath the surface of the
ground and discharge will not be made through suitable soil,
either existing or constructed, or through a sand filter,
the following standards shall be met:
1. There shall be at least 4 feet of soil between the
maximum seasonal high water table and the level of
effluent discharge.
2. The standard B0D5 shall not exceed 60 milligrams per
liter (60 mg /1).
3. The total suspended matter shall not exceed 100 milli-
grams per liter (100 mg /1).
10.3 Methods of Analysis - Sampling Points: All effluent samples
shall be analyzed according to methods prescribed in the 14th
- 47 -
edition of "Standard Methods for the Examination of Water and
Wastewater" (American Public Health Association). The point
of sampling shall be a location that is representative of final
discharge from the system. �..`
10.4 Disinfection of Effluent (when required):
a. Disinfection shall be introduced into the effluent.
b. A contact basin shall be provided for disinfection of
effluent which meets the following requirements:
1. A minimum of 60 minutes detention time;
2. A free residual chlorine (or equivalent) of
1.0 ppm tested at the exit of the effluent pipe of the
basin;
3. Thorough mechanical mixing or a basin having a length
to width ratio of 40:1, with a sharp crested weir
spanning the entire width of the basin outlet. Other
designs shall be approved when proof of their effective-
. �
ness is submitted for an acceptable design.
SECTION XI: MANUFACTURED UNITS UTILIZING MECHANCIAL APPARATUS FOR
TREATMENT OF SEWAGE
11.0 General: Individual sewage disposal systems utilizing mechanical
apparatus and furnished for installation in Eagle County shall
comply with the minimum requirements of criteria and construction
standards set forth in these Regulations.
11.1 No such unit utilizing mechanical apparatus and which is designed
for discharge either upon the ground or beneath the ground
surface or which may adversely affect Eagle County waters shall
be permitted unless (1) the system is installed within a geo-
graphic area wherein a public, quasi - public, or private entity,
or political subdivision is continually responsible for the
efficient operation and maintenance of said unit, or (2) the
operator of the system insures such an efficient operation of
all mechanical and electrical component parts provided prior to
and during continuing use..
ter=
11.2 No manufactured units, utilizing mechanical apparatus shall
be permitted in Eagle County unless the Colorado Department of
Health has certified the treatment system based upon its approval
of independently certified laboratory results furnished by the
manufacturer, provided however, the Department shall take into
consideration any other test information available to the
Department concerning the reliability and performance of the
system. The Department shall certify any unit for subsurface
discharge which bears the National Sanitation Foundation Standard
40 Certification, * or equivalent testing program, and is
otherwise approved by the Department. When the Department shall
be satisfied and has issued its certification, the Eagle County
Board of Health shall be entitled tc rely thereon. The issuance
of any such certificate shall not relieve the holder thereof or
the user of the unit from the responsibility of complying with
these Regulations and the applicable rules and regulations
adopted pursuant to law.
SECTION XII: EFFLUENT DISCHARGED TO STATE WATERS
Any system which will dispose of effluent by discharging
into State waters shall be designed by a Registered Professional
Engineer and the application shall be submitted for preliminary
approval to the Eagle County Board of Health. Once approved,
the application shall be forwarded to the Division for issuance
of a permit in compliance with all applicable regulations of the
Water Quality Control. Commission. Compliance with such a permit
shall be deemed full compliance with all individual sewage
disposal system regulations.
* A copy of the NSF Standard No. 40 is available at local libraries or
can be inspected in the offices of the: Colorado Water Ouality
Control Division, Colorado Department of Health, 4210 East 11th Ave.,
Denver, during working hours.
SECTION XIII: WATER QUALITY CONTROL COMMISSION REGULATIONS
All systems in areas designated by the Water Quality Control
Commission pursuant to C.R.S. 1973, 25 -8 -206 must comply with
all regulations promulgated by the Commission for those areas.
Applications for such systems must be submitted to the Water
Quality Control Division for permit issuance pursuant to
C.R.S. 1973, 25 -8 -504. Compliance with such a permit shall
be deemed full compliance with all individual sewage disposal
system regulations_
SECTION XIV: INSTALLATION
14.0 General: Treatment units shall be set on a firm and level
base except as otherwise provided in these Regulations and shall
be capable of accommodating flow with hydraulic efficiency.
14.1 Mechanical Components:
a. Ventilation and Air System: Mechanical components shall
be installed in a properly vented location and all vents,
air intakes, and air hoses shall be protected from snow,
ice, or water vapor accumulations.
b. Components Installation: Mechanical components installed
in or at the unit must be protected against damage or impair-
ment of their efficiency by flooding, foaming, or surcharging.
14.2 Covers, Barriers, or Other Protection: All systems must be
installed to include protection of openings against entrance
of insects and rodents. Barriers shall be provided to prevent
entrance by unauthorized persons.
SECTION XV: OPERATION AND MAINTENANCE
15.1 Responsibility: The owner and the party in possession of real
property upon which an individual sewage disposal system is
used, shall be jointly and severally responsible for operation
and maintenance of the system unless jurisdiction for responsi-
bility has been transferred to a public, quasi - public, or
- 50 -
�J
political subdivision. The person denying such responsibility
shall bear the burden of proof for such denial upon establishment
of ownership or possessory rights on the property served by
the system.
15.2 Service Label: For treatment plants utilizing mechanical apparatus
or under a service policy, a clearly visible, permanently
attached label or plate giving instructions for obtaining
service shall be placed at a conspicuous location.
15.3 Maintenance and Cleaning: When directed by the Environmental
Health Department, for the purpose of obtaining compliance
with rules and regulations, the owner or user of a system shall
provide for maintenance and cleaning of an individual sewage
disposal system and shall notify the Environmental Health
Department upon completion of any maintenance work and report
to said department and submit such evidence of compliance with
any maintenance and cleaning schedule in the form and as said
department requires.
15.4 Monitoring and Sampling:
a. Reasonable periodic collection and testing by the Environ-
mental Health Department of effluent samples from individual
sewage disposal systems for which monitoring of effluent is
necessary in order to insure compliance with the provisions
of rules and regulations may be performed not more than
two (2) times per year, except when required by the Health
Officer in conjunction with an enforcement action.
b. Any owner or occupant of property on which an individual
sewage disposal system is located may request the Environ-
mental Health Department to collect and test an effluent
sample from the system. The Environmental Health Department
may perform such collection and testing services.
C. A fee of $25, plus 14C for each mile traveled from the
principal office of the Environmental Health Department to
the site of the system and return, shall be charged for
each sample collected and tested, and payment of such
- 51 -
charge may be stated in the permit as a condition for its
continued use.
15.5 Disposal of Waste Materials: Disposal of waste materials removed
from a system in the process of maintenance or cleaning shall
be accomplished at a site in a manner which does not create a
hazard to the public health, a nuisance, or an undue risk of
pollution and which complies with State and local rules and
regulations.
15.6 No Discharge is Permitted Which Does Not Comply with Rules and
Regulations: No sewage or effluent shall be permitted to be
discharged into or upon the surface of the ground or into State
waters unless the sewage system and effluent meets the minimum
requirements of applicable rules and regulations.
15.7 Termination of Use of System: The contents of a septic tank,
vault, or seepage pit, the use of which has been terminated,
shall be properly disposed of whereupon the emptied tank, vault, -,--,„
a'
or pit shall be filled with rock or soil.
- 52 -
A P P E N D I X E S
J
APPENDIX A - Statement of Basis and Purposes
APPENDIX B - Soil Classification Systems
(Soil- Separate Size Limits)
APPENDIX C - Guide for Textural Classification
APPENDIX D - Guide for Soil Compaction
- 53 -
STATEMENT OF BASIS AND PURPOSES
The guidelines regulating the Individual Sewage Disposal Regulations were
mandated by law, Article 10, Section 25 -10 -104 (1), Title 25. The present
amended guidelines were adopted by the State Board of Health in 1974.
As more experience was gained in the field, there was a preponderance of
questions directed to this Division for clarification. Based on the dis-
cussions held with the local boards of health, the General Services Section
of this Division held a limited investigation into the various causes of
individual sewage disposal systems failures in the State, in the summer of
1977.
The Attorney General's Office had advised this Division of the need to amend
the guidelines applicable to the local boards of health and all local
jurisdictions in the State. Our experience has shown that some of the local
jurisdictions did not adopt their own regulations as required by Section 25-
10- 104(2). This made the monitoring and enforcement difficult for this
Division. Because of such situations, the new guidelines were updated to
include provision where the guidelines will automatically become effective
for any local board of health or jurisdiction that failed to adopt its own
regulations within a year.
The advent in alternatives to sewage disposal has made it imperative that
this Department address the new technology and its application.
Based on the above issues, at the request of the Department, a committee
was appointed and charged with the responsibility of revising the guidelines.
The main objective was to maintain uniformity of the standards within the
State and also allow for imposing more stringent standards by the local
boards of health wishing to do so based on environmental constraints endemic
to their areas of jurisdiction.
The purpose of these guidelines by the local and county boards of health is
to provide guidance as authorized by law, Sec. 25 -10- 105(2). The guidelines
shall become effective as regulations in any local health departments not
adopting their own regulations within a year.
The objectives of the proposed regulation are to provide guidance and establish
minimum standards for the location, construction, performance, installation,
alteration, and use of individual sewage disposal systems within the State
of Colorado. This guideline and /or regulation shall apply to individual
sewage disposal systems with a design capacity of 2,000 gallons or less per
day which will not discharge into State waters.
In preparing the guideline, the Department used information available from
scientific and technical journals, design manuals established by the Environ-
mental Protection Agency, research and scientific reports from the National
Science Foundation, the U. S. Department of Health, Education, and Welfare,
and other sources referred to directly in the appendixes.
APPENDIX A, page 1
The statements contained herein are intended to comply to Section 24 -4 -103
(as amended) C.R.S. 1973, as prescribed by the Statute.
These regulations establish basic standards for regulating the Individual
Sewage Disposal Systems within the State of Colorado. These regulations
are intended to comply with the legislative intent as stated in Title 25,
Article 10, C.R.S. 1973, Sec. 25 -10 -102.
APPENDIX A, page 2
G]
H
z
cn
H
N
C9
H
z
3
H
r
r
H
CT]
H
bd
U)
Source:
Virginia Erosion and Sediment Control Handbook.
SOIL CLASSIFICIATION SYSTEMS
SOIL - SEPARATE SIZE LIMITS
UNIFIED CAA USDA AASHO ASTM
* Included in clay fraction in test reports
APPENDIX B
j
Colloids*
Colloids*
C
0.0011--,
Clay
U)
Clay
cn
to
0.002'
-
Clay
Clay
y
-
Fines
y
b
z
0.005;
-
(Silt
U)
i
I_
H
f
Silt
0.01
-
or
3
3
ti
i Silt
Silt
N
Cla )
y
Silt
0.02
0.03
-�
0.04
0.05
=I
-
Very Fine
'200
(0 074)
0.1
-
Fine
Sand
'140
(0 105)
Fine
Fine
Sand
'100
(0 149)
Sand
Fine Sand
Fine Sand
0 2
-
Sand
pp
90
(( ??55 )
0.3
_
Medium
(8 299)
0.4
Sand
40
(0 42)
r-
0.5
=
Coarse
30
(0 59)
Coarse
Medium
Sand
Coarse
Coarse
20
(0 84)
1.0
�-
-
Sand
Sand
Sand
Sand
' 16
(1 19)
"-
Ver C arse
gan g
2.0
10
(2 0)
[[
Coarse
' 8
(2 38)
3.0
_
Sand
Fine
4.0
-
Fine
4
(4 76)
5.0 r
-
_
Fine
Gravel
Gravel
10-
Gravel
3/8"
(9525)
Medium
1/2"
(12 7)
Gravel
3/4"
(19 05)
20 i-
Coarse
Gravel
30
-
Coarse
Gravel
1"
(25 4)
Gravel
Coarse
' Y"
(38 1)
440o
SO
-
Gravel
{
Gravel
2"
(50 8)
=
3"
(76 2)
100
Cobbles
I
Cobbles
6"
(152 4).
Boulders
200
_
300
-
12" I
(304 8) I
400
* Included in clay fraction in test reports
APPENDIX B
S
.. jl
PROPORTIONS OF SAND, SILT, AND CLAY it!
THE BASIC SOIL - TEXTURAL CLASSES
100
/ o
00 \
10 / \ o
=CY
/ \,i a
o N
t 1
50 ��v \�A �SIITY
C
SANDY ! O
CL AY
\.� `� , CLAY ,lSILiY CLAY ° LOAM 30 \ SANDY CLAY
LOAN
\ ' \\ /\ �� LOAM ! -•\ j
A80T LOAN \, i\ -
/SILT LIIAM \.. ..._ o0
SAND sANO ' \ \ �\ \ \
n
/pp .9p dp O Sp Sp rp Jp 'p O
PEACENT SAND
U S STA.OAXU SIEVE M1148EX5
10 i0 to io 100
(TRT
UT—FIT-1
SA1fO
'i E H� Slli I CLAY
�E Y •"• s
—� __j I I
6X11. SIZE. nn
Source: EPA Design Manual For Land Treatment of Municipal Wastewater
APPENDIX C
Guide For Soil Compaction
The percent of relative compaction required will be equal
to or greater than minimum values as shown in the follow-
ing table for the various classes of soil and type of
compaction.
NOTES
1. AASHTO:
AASHTO
AASHTO
Soil Classification
T99
TWO
( AASHTO M145)
Minimum
Minimum
Relative
Relative
Procedure
Compaction
Compaction
3. AASHTO
0)
(7)
- 10
lb. Rammer
4. Source
A -1
100
95
A -3
100
95
A -2 -4
100
95
A -2 -5
100
95
All others
95
90
NOTES
1. AASHTO:
American Association
of State
Highway
Transportation
Officials.
2. AASHTO
- T99: Standard Test
Procedure
- 5.5
lb. Ranm;er
3. AASHTO
- TWO: Standard Test
Procedure
- 10
lb. Rammer
4. Source
of information: Soils
Manual M.
S.10
- The Asphalt
Institute
APPENDIX D