HomeMy WebLinkAboutInstallation Observation Letter 10.21.2024CBO Inc.
129 Cains Lane
Carbondale, CO 81623
970.309.5259
carla.ostberg@gmail.com
October 21, 2024 Project No. C1869
Whit Whitaker
wrw3@hotmail.com
Onsite Wastewater Treatment System (OWTS) Installation Observations
11454 CR 115 (Barn )
Garfield County, Colorado
OWTS Permit SEPT-8545
Whit,
CBO Inc. observed the installation of the onsite wastewater treatment system (OWTS) on July 25, 2024
for the subject property. RWI Excavating in stalled the system.
The OWTS design used an average daily wastewater flow of 200 GPD. This is an estimated design flow
based on use of a toilet and sink in the Barn and occasional use from the RV dump. No chemicals
should be introduced into the OWTS.
The 4-inch SDR-35 sewer line exiting the barn has a double-sweep clean out and a minimum 2% grade
to the septic tank.
The system installation included a 1000-gallon, two-compartment Norwesco® poly septic tank with an
Orenco® Biotube 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 four gravelless chamber trenches. The distribution
box was accessible from grade with flow equalizers installed on each outlet pipe in the distribution box to
assure equal flow to each trench.
Each trench consists of 7 ‘ADS’ ARC 36 Low Profile chambers for a total of 28 chambers and 420 square
feet of infiltrative area. Trenches were shallow with no more than 1-foot below native grade and the
backfill mounded over the trenches. 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 installation Sewer line exiting Barn
Chambers Shallow trenches / sewer lines well bedded
Inspection ports at beginning and end of each trench
View of distribution box Dbox
Plumbing into and out of septic tank / clean out in place
Low Profile ARC chambers
Garfield County Public Health
2014 Blake Ave.
Glenwood Springs, CO 81601
Phone: (970) 945-6614 ext. 8150
For inspections, call: 970-945-6614 ext. 8150 and call the Design Engineer, if applicable
Project Address: 11454 CR 115 Glenwood Springs, CO Parcel No.: 239106400146
Owner Name: Walter Whitaker Owner Phone: (970) 272-8412
Designed By: CBO Designer Phone: (970) 309-5259
Number of Bedrooms: 0 Minimum Tank Capacity: 1,000-gallon Minimum Absorption: 166.4 ft 2
OWTS PERMIT
KEEP AVAILABLE AT PROJECT SITE
Permit Number _SEPT-8545_______________________________
Permit Type X New X Repair X Remodel/addition X Tank only
Issue Date _04/11/2024____________________ Expiration Date_04/11/2025_________________
Permit Conditions:
Permit Conditions: This OWTS Permit is approved on the condition of compliance with the design as
submitted by CBO dated March 4, 2024. Changes must be approved by Garfield County Public Health
and the designer prior to construction.
The new OWTS will include a toilet, sink, and RV dump station to serve an existing ADU barn. The
system will consist of a new, two-compartment minimum 1,000-gallon septic tank set level with
access to grade and an effluent filter in the outlet tee of the tank. Effluent will gravity flow to a
distribution box set level with access to grade that will distribute effluent to 432 ft 2 of STA. The new
STA will consist of 3 gravelless trenches consisting of 12 Quick4 chambers, for a total of 36 Quick4
chambers. Inspection ports are to be installed at the terminal ends of each trench. Maintain all
setbacks and elevations as designed.
Contact the designer and Garfield County Public Health at least 48 hours prior to requesting final
inspection of the installed system prior to backfill. NO OWTS COMPONENT SHALL BE BACKFILLED
WITHOUT PRIOR APPROVAL FROM GARFIELD COUNTY PUBLIC HEALTH AND THE DESIGNER.
Agreement
All installations must comply with all requirements of the Garfield County OWTS regulations
including but not limited to the conditions specified above.
In consideration of the issuance of the permit, the applicant hereby agrees to comply with all
laws and regulations related to the zoning, location, construction, and erection of the proposed
OWTS and associated structures for which this permit is granted. The applicant further agrees
that if the above said regulations are not fully complied with in the zoning, location, erection,
and construction of the above described OWTS and structure, the permit may then be revoked
by notice from the Health Department and immediately become null and void.
The issuance of a permit and specifications of terms and conditions therein will not constitute
assumption of liability, nor create presumption that the local public health agency or its
employees may be liable for the failure or malfunctioning of any system. Permit issuance will
not constitute a certification that the system, the equipment used in the system, or any
component used for system operation will ensure continuous compliance with the provision of
the OWTS Act, the regulations adopted thereunder, or any terms and conditions of a permit.
Permit Approval
Plans and specifications for the proposed OWTS have been reviewed and are considered
satisfactory. Permission is hereby given to the property owner(s) to perform the work indicated
in accordance with the Garfield County OWTS Regulation. This Permit will expire 1 year from
the date of issuance unless construction on the system has commenced. An "as-built" drawing
must be submitted and inspection of the system must be completed by GCPH before final
approval of the system will be issued.
04/11/2024
Issued By: Garfield County Environmental Health
Department
Date
832‐R‐13‐002