HomeMy WebLinkAboutOWTS Installation Observations 05.24.202033 Four Wheel Drive Road
Carbondale, CO 81623
970.309.5259
carla.ostberg@gmail.com
May 24, 2020 Project No. C1524
Kris Shannon
kristin_shannon@ymail.com
Onsite Wastewater Treatment System (OWTS) Installation Observations
6000 Red Canyon Road
Garfield County, Colorado
Permit Number SEPT-09-18-5498
Kris,
CBO Inc. observed the installation of the onsite wastewater treatment system (OWTS) on May 14, 2020
for the subject property. Abel Montanez installed the system.
The OWTS design was based on 2-bedrooms. An average daily wastewater flow of 300 GPD was used.
The 4-inch diameter SDR-35 sewer line exiting the residence included a double-sweep clean out and a
minimum 2% grade to the septic tank.
The system installation included a 1000-gallon, two-compartment concrete septic tank with an effluent
filter on the outlet tee. This filter must be cleaned annually, or as needed. Risers bring the manhole
lids to grade for access.
Effluent gravity flows to a distribution box, and then to three gravelless chamber trenches. The
distribution box was accessible from grade and flow equalizers were installed on each outlet pipe in the
distribution box to assure equal flow to each bed.
Each trench consisted of 12 ‘Quick 4’ Standard Plus Infiltrator® chambers for a total of 432 square feet of
infiltrative area. There was at least 4-feet of undisturbed soil between each trench. Inspection ports
were installed at the beginning and end of each trench. Ports may be cut to grade and placed in sprinkler
boxes for access.
The OWTS was generally installed according to specifications. This observation is not a guarantee of
workmanship and/or parts and materials. CBO Inc. should be notified if changes are made to the OWTS
in the future. Any additional OWTS construction must be according to the county regulations.
LIMITS: Observations are limited to components that are visible at the time of the inspection. The installer must
have documented and demonstrated knowledge of the requirements and regulations of the county in
which they are working. The quality of the installation is dependent of the expertise of the installer, soil
type, and weather conditions.
Please call with questions.
Sincerely,
CBO Inc.
Carla Ostberg, MPH, REHS
Pipe from tank to STA clean out on sewer line between tank and STA
Sewer line bedded in gravel
Chamber trenches splash plates installed on end caps
Depth to bottom of trench does not exceed 48”
Distribution box house to tank
Septic tank prior to backfill
Effluent filter prior to installation
Schedule 40 under driveway / pipe laid out prior to gluing
832‐R‐13‐002