HomeMy WebLinkAboutOWTS Engineer's Design-Revision 08.08.2023Client:Paul Salmen Project Location:1506 Midland Avenue
1504 Midland Avenue Glenwood Springs, CO
Glenwood Springs, Colorado 81601
Date:4-Aug-23
Flow Data for the OWTS Design
1 Home Use (4 Bedroom Home)525
Total=525
Home Use 525 gpd 0.48 #/day
Totals:525 gpd 0.48 #/day
Soil Data for the OWTS
2 Data from Kumar tactile soil analysis:Classified as a Sand, Loamy Sand
At a depth of 8', neither bedrock or groundwater are expected to be encountered.
Data from the web soil survey indicates an Ascalon-Pena complex exists.
Given the consideration of all data, the Long Term Acceptance Rate to use is 0.8 gallons/sf/day
for treatment level 1 (TL1)
For Treatment Level 3 (TL3) use a loading rate of 0.80 gallons/sf/day
(in order to achieve TL3, install Advantex AX25RT - 3B)
OWTS Design Report and Calculations
For Home Use, 2 persons per bedroom and 75 gallons per day per person, BOD5 = 0.06
#/person/day for up to 3 bedrooms and 1 person per bedroom there after
Septic Tank Sizing
3 Flow calculated from above:525 gpd
48 hour detention time for septic tank sizing;Volume= 1050 gpd
Install a 1250 gallon tank.
Sizing of Absorption Field or Soil Treatment Area
5 Going with a soil type R-0 and Treatment Level 1, LTAR = 0.8 g/sf/d
For a pressure dosed system, size adjustment factor is 1.0 for a bed configuration
For a gravity system, the size adjustment factor shall be 1.2 for a bed configuration
For a gravity trench system, adjustment factor = 1.0
For a pressure dosed trench system, adjustment factor = 0.8
For use of chambers: size adustment factor is 0.7
STA= Flow/LTAR 656 square feet (unfactored)
For a chamber system, adjust size to 0.7*656= 459 square feet
For pressure dosed system, adjust size to 0.8*459=368 square feet
For a chamber system in a trench configuration, length=123 feet
(this would equate to 2 runs of 56 feet each)
With the effective length of a Quick4 chamber at 4', use 16 chambers per trench for two trenches
(total length of each trench is thus 64 feet long for chambers only, and 66.8 feet with end caps)
Soil Classification based on
Kumar gradation
NO
NO
NO
YES
YES
62
Final design: Go with standard pressure distribution
system using Infiltrators and 36" of sand. No Advantex
Treatment Unit required. Use adjustment factor of 0.8
for pressure distribution and 0.7 for using chambers
and loading rate will be 0.8 gallons/sf/day for both
insitsu soils and secondary sand media
Graphic Scale
In Feet: 1" = 10'
0 5 10 20
Title:
OWTS Plan
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Job No.
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2/07/2023
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OWTS REVISED
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8/8/23
8/8/23