HomeMy WebLinkAboutOWTS Installation Observations 10.13.2025CBO Inc.
129 Cains Lane
Carbondale, CO 81623
970.309.5259
carla.ostberg@gmail.com
October 13, 2025 Project No. C1909
Brad and Ruth Mollman
bramcollc@bramcollc.com
Onsite Wastewater Treatment System (OWTS) Installation Observations
563 CR 335
Garfield County, Colorado
Permit SEPT-8929
Brad and Ruth,
CBO Inc. observed the installation of the onsite wastewater treatment system (OWTS) on October 9,
2025 for the subject property. Russell Aaberg installed the system.
The OWTS design is based on 2-bedrooms in the ADU/Barn and 3-bedrooms in the Future Main
Residence. An average daily wastewater flow of 750 GPD was used. When the Main Residence
building permit is obtained, an OWTS permit application must also be obtained for the installation of the
septic tank to serve the Main Residence.
The setback from the ditch to the soil treatment area (STA) was verified at approximately 80-feet.
The 4-inch SDR-35 sewer line exiting the ADU/Barn has a double-sweep clean out and a 2% grade to
the septic tank.
The system installation included a 1000-gallon, two-compartment Infiltrator® 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 five gravelless chamber trenches. The distribution
box is accessible from grade with flow equalizers.
Each trench consists of 15 ‘Quick 4’ Standard Plus Infiltrator® chambers for a total of 75 chambers and
900 square feet of infiltrative area. There was 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
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: 563 County Road 335, New Castle, CO 81647 Parcel No.: _217912401006
Owner Name: Bramco LLC Owner Phone: (970) 404-5541
Designed By: CBO, Inc. Designer Phone: (970) 309-5259
Contractor: Russel Auberg Trucking Contractor Phone: (970) 618-1757
Number of Bedrooms: _5_ Minimum Tank Capacity: 1,500-gallon Minimum Absorption: 875 ft2
OWTS PERMIT
KEEP AVAILABLE AT PROJECT SITE
Permit Number _SEPT-8929_______________________________
Permit Type X New X Repair X Remodel/addition X Tank only
Issue Date _10/18/2024____________________ Expiration Date_10/18/2025_________________
Permit Conditions:
This OWTS Permit is approved on the condition of compliance with the report and design as
submitted by CBO, Inc. dated September 14, 2024. Changes to the design and permit must be
approved by Garfield County Public Health and the designer prior to construction.
The new OWTS will serve a new three-bedroom residence and two-bedroom Accessory Dwelling
Unit (ADU). The system will consist of either two new, two-compartment 1,000-gallon septic tanks or
one 1,500-gallon two compartment septic tank with an effluent filter in the outlet tees of the tank.
The septic tanks shall be on the Colorado Department of Public Health and Environment’s approved
septic tank list. Effluent will gravity flow to a distribution box set level with access to grade to
distribute effluent to 900 ft2 of STA. The new STA will consist of five gravelless chamber trenches,
each trench consisting of 15 Quick4 chambers per trench (75 chambers total). Inspection ports shall
be installed at each end of each trench. Maintain all setbacks and elevations as designed.
To assist in scheduling, please contact Garfield County Public Health (970-945-6614 ext. 8150) to
notify the start of OWTS construction. 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.
10/18/2024
Issued By: Garfield County Environmental Health
Department
Date
832‐R‐13‐002