HomeMy WebLinkAboutEngineer's Installation Observation 08.13.2023CBO Inc.
129 Cains Lane
Carbondale, CO 81623
970.309.5259
carla.ostberg@gmail.com
August 13, 2023 Project No. C1652
Gary Manchester
gmanchester@lastridgedev.com
Onsite Wastewater Treatment System (OWTS) Installation Observations
800 Schooner Lane
Garfield County, Colorado
Permit SEPT-7135
Gary,
CBO Inc. observed the installation of the onsite wastewater treatment system (OWTS) on October 14,
2022 and May 17, 2023 for the subject property. Fransisco Gonzalez (FH Excavating) installed the
system.
The OWTS design is based on 5-bedrooms in a single-family residence. An average daily wastewater
flow of 600 GPD was used.
Two 4-inch diameter SDR-35 sewer lines exit the residence with double-sweep clean outs and a
minimum 2% grade to the septic tank. The sewer line from the Master Bedroom Wing ties into the main
sewer line with a wye fitting before the septic tank.
The system installation included a 1500-gallon, two-compartment septic tank Valley Precast concrete
septic tank with an effluent filter on the outlet tee. This 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 five GeoMat™ trenches. The distribution box is
accessible from grade with flow equalizer installed on each outlet pipe in the distribution box to assure
equal flow to each trench.
Each trench is 36-inches wide with a minimum of 6-inches (installer reported 9 to 14-inches) of sand filter
material placed in the trench. Specifications for the sand filter material are enclosed.
The GeoMat™ sheets were placed on top of the sand filter material the entire length of the trench. A 4-
inch diameter perforated pipe was placed down the center of the GeoMat™, under the top layer of fabric.
The soil treatment area (STA) consists of 5 trenches, each with 56 linear feet of 39-inch wide GeoMat™
for a total of 280 linear feet and 840 square feet.
There was at least 4-feet of undisturbed soil between each trench. Inspection ports were installed at the
beginning and end of each trench. The front inspection port was placed to the side of the GeoMat™ and
the end inspection port was tied onto the end of the lateral. Ports may be cut to grade and placed in
sprinkler boxes for access.
Initially, the first trench was installed too close to the septic tank. That trench was abandoned, and another
trench constructed on the south side of the STA.
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
Measure of undisturbed soil between beds View of distribution box
Looking toward STA GeoMat trenches
GeoMat trench (9-14” sand under GeoMat) Distribution box
Distribution box plumbing outside of box
Distribution box level
Inlet tee Outlet tee with effluent filter
Trenches
(Originally tank was set too close to trenches. First trench abandoned and another trench installed on the
south side of the bed)
Trenches with inspection ports Septic tank (first trench relocated)
Clean outs on sewer lines
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: Lot 26, Stirling Ranch, Carbondale, CO 81623 Parcel No.: _239129305026
Owner Name: Gary and Jeane Manchester Owner Phone: (720) 670-8129
Designed By: CBO Septic Consulting Designer Phone: (970) 309-5259
Contractor: Last Ridge Development Corp Contractor Phone: (720) 670-8129
Number of Bedrooms: 5 Minimum Tank Capacity: 1,500-gallon Minimum Absorption: 840 ft 2
OWTS PERMIT
KEEP AVAILABLE AT PROJECT SITE
Permit Number _SEPT-7135_______________________________
Permit Type X New X Repair X Remodel/addition X Tank only
Issue Date _10/01/2021____________________ Expiration Date_10/05/2022_________________5
Permit Conditions:
This OWTS Permit is approved on the condition of compliance with the report and design as
submitted by CBO Septic Consulting, Inc. dated September 7, 2021. 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 5-bedroom residence. The system will consist of a new, two-
compartment minimum 1,500-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 840 ft2 of STA. The new STA will consist of five gravelless
GeoMat trenches. Each trench will consist of six inches of secondary sand material on the bottom of
the trench, with the GeoMat placed directly on the sand. The trenches will be 3-feet wide by 56-feet
long. Inspection ports are to be installed at each end 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.
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.
10/05/2021
Issued By: Garfield County Environmental Health
Department
Date
832‐R‐13‐002