HomeMy WebLinkAboutInstallation Observation Letter 07.13.2023CBO Inc.
129 Cains Lane
Carbondale, CO 81623
970.309.5259
carla.ostberg@gmail.com
July 13, 2023 Project No. C1638
Tim Pestotnik
tim@pestotnik.com
Onsite Wastewater Treatment System (OWTS) Installation Observations
133 Saddle Circle
Garfield County, Colorado
Permit # SEPT-7114
Tim,
CBO Inc. observed the installation of the onsite wastewater treatment system (OWTS) on January 14,
2022 for the subject property. Condon Construction installed the system.
The OWTS design was based on 6-bedrooms in a single-family residence. An average daily wastewater
flow of 675 GPD was used.
The 4-inch diameter SDR-35 sewer line exiting the residence had a double-sweep clean out and a
minimum 2% grade to the septic tank.
The system installation included a 2000-gallon, two-compartment Valley Precast concrete septic tank
with an effluent filter on the outlet tee. The effluent filter must be cleaned annually, or as needed.
Risers must bring the manhole lids to grade for access.
Effluent gravity flows to a distribution box, and then to four gravelless chamber trenches. The distribution
box was accessible from grade with flow equalizers installed on each outlet pipe to assure equal flow to
each trench.
Each trench consists of 14 ‘ADS’ ARC 36 Low Profile chambers for a total of 56 chambers and 840
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 on the expertise of the installer, soil
type, and weather conditions.
Please call with questions.
Sincerely,
CBO Inc.
Carla Ostberg, MPH, REHS
Septic tank double sweep clean out
Sewer line from house to septic tank
Clean out near foundation
Inlet tee Outlet tee with effluent filter and handle extension
View of septic tank
Distribution Box
Sewer line well bedded
Chamber trenches
Distribution pipe entered bottom port / all end caps changed so distribution piping entered top port
832‐R‐13‐002