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"--43.7 Minimum Distances Between CompO ts of an On-site Wastewater Treatment System and Physical Fe ns
Table 7-1 Minimum Horizontal Distances In Feet Between Components of an On-Site Wastewater Treatment System Installed After
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~-~ Sprin~, otab ~ Dwelling Property Subsurface Lake, Dry Septic
Well , '/.tlater. Water Occupied Lines, Drain , Water Gulch, Tank
Suction '~ tSuPP~ Building Piped or Intermittent Course , Cut
Line .CC !sterrit Lined Irrigation Irrigation Bank, Fill
Irrigation Lateral, Ditch, Area
Ditch Orywell, Stream , (from
Stormwater Wetland Crest)
Infiltration
Structure
tSi!if§Jii!OO Higher Level 50 2 I 102 ~ ~ 5 10 10 50 10 -
Treatment Unit, Dosing Tank, '-:::'.:::
Vault
--.....r 252~ \.Bultdlna: sewer or :EmueiiWaes1
,..-
10 2 10 2 50 2 50 2 ........ 102 )--. 0 102 -
~ .___,
~
STA Trench, STA Bed, Unlined 1003 25 2 25 20 10 25 503 25 5
Sand Filter, Sub-surface
Dispersal System , Seepage Pit
102 .
Lined Sand Filter 60 25 15 10 10 25 10 5
Lined Evapo-transpiration Field or 60 102 25 15 10 10 25 10 5
Outside of Berm of Lined
Wastewater Pond
Unlined Sand Filter in Soil With a 100 25 2 25 15 10 25 25 I 15 10
Percolation Rate Slower than 60 I
Minutes per Inch, Unlined or
Partially Lined Evapotrans-
piration System , Outside of Berm
of Unlined Wastewater Pond, or
System Not Relying on STA for
I' 'I Treatment Other than Aerosol
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r 43.7 Minimum Distances Between Comp(" its of an On·site Wastewater T reatment System and Physical Fet ~s
Vault Privv 50 102 25 15 10 10 25 10 -
Slit Trench Latrine, Pit Privy 4 100 502 25 NIA 25 25 100 25 N/A
System Not Relying on ST A for 1003 102 50 125 10 0 253 10 10
Treatment and Utilizing Aerosol
Methods I
NOTE : The minimum distances shown above must be maintained between the OWTS components and the features described . Where soil , geological or other conditions warrant.
greater distances may be requ ired by the local board of health or by the Water Quality Control Commission pursuant to section 25-8 -206. C.R.S. and applicable regulations . For repair
or upgrading of existing OWTS where lhe size of lot precludes adherence lo these distances , a repa ired OWTS shall not be closer to setback features than the existing OWTS, as
reviewed and approved by the local public health agency. Components that are not watertight should not extend into areas of the root system of nearby trees .
1 Includes Infiltration galleries permitted as wells by the Division of Water Resources .
,.....--;-) Crossings or encroachments may be permitted al the points as noted above provided that the water or wastewater conveyance pipe is encased for the minimum setback ~nee on each side of the crossing . A length of pipe shall be used with a minimum Schedule 40 rating of sufficient diameter to easily slide over and completely encase the
conveyance. Rigid end caps of at least Schedule 40 rating must be glued or secured In a watertight fa shion to the ends of the encasement pipe . A hole of sufficient size to
accommodate the pipe shall be drilled in the lowest section of the rigid cap so that the conveyance pipe rests on the bottom of the encasement pipe . The area in which the pipe
passes through the end caps shall be sealed with an approved underground sealant compatible with the piping used.
3 Add eight feet additional distance for each 100 gallons per day of design nows between 1,000 and 2,000 gallons per day, unless ii can be demonstrated by a professional
engineer or geologist by a hydrologlc analysis or the use of a barrier, consisting of a min imum 30 mil PVC liner or equ ivalent , that contamination will be minim ized. If effluent meets
Treatment Level 3N and the local public health agency has a maintenance oversight program in accordance with section 14.D. of thi !I regulation , the distance addition is not required .
Flows equal to or greater than 2,000 gallons per day must be hydrological ana lyzed for now. velocity, hydraulic head , and other pertinent characteristics as means of estimating
distances required to minimize contamination as part of the Division site application process.
4 New Installations for pit privy and slit trenches not allowed .
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