HomeMy WebLinkAboutEngineer's Installation Observations 01.02.2023CBO Inc.
129 Cains Lane
Carbondale, CO 81623
970.309.5259
carla.ostberg@gmail.com
January 2, 2023 Project No. C1684
Dan Dixon
dan@custom-works.biz
Onsite Wastewater Treatment System (OWTS) Installation Observations
2395 Hwy 133
Garfield County, Colorado
Permit Number SEPT-12-21-7272
Dan,
CBO Inc. observed the installation of the onsite wastewater treatment system (OWTS) on December 22,
2021 and January 2, 2023 for the subject property. Black Timber Excavation installed the system.
The OWTS design is based on 3 bedrooms in the Residence and one future bedroom in the detached
shop which may become an Accessory Dwelling Unit (ADU). An average daily wastewater flow of 600
GPD was used.
The existing septic tank was removed. The plumbing was re-routed through the crawl space of the in the
residence to exit at a higher elevation and slightly different location than the existing sewer line.
The new, 4-inch diameter SDR-35 sewer line had a minimum 2% fall to the septic tank and a double-
sweep clean out. The existing sewer line serving the existing shop (future ADU) was routed to connect to
the sewer line from the residence prior to entering the septic tank.
A new 1500-gallon, two-compartment Valley Precast concrete septic tank was installed with an Orenco®
ProPak and an Orenco® PF3005 pump in the second compartment of the septic tank. Risers were
installed on the septic tanks to bring access to grade. The floats were set to dose approximately 55
gallons each pump cycle. The control panel is located within line of sight of the septic tank. Valley Precast
out of Buena Vista performed start-up of the pumping system.
Effluent is pumped through a 1.5-inch diameter pump line from the pump chamber to an Orenco®
automatic distributing valve (ADV), model 6402. The ADV was placed at a high point in an insulated riser
with access from grade.
Effluent is pressure dosed through 1.5-inch diameter distribution lines to two zones in a 12’ x 62.5’ bed. A
minimum of 2-feet of sand filter material was installed in the over-excavated footprint. A gradation of the
sand media is enclosed.
Laterals were connected with 1.5-inch diameter level manifolds. Laterals used to disperse the effluent were
surrounded by washed coarse screened gravel (minimum 6-inches below and minimum 2-inches above
laterals). Laterals were 1.5-inches in diameter with 5/32-inch diameter orifices facing down, spaced 3-feet on
center (OC). Orenco® Orifice Shields were installed under each orifice. Each 1.5-inch diameter lateral
ends in a sweeping ell facing up with a ball valve for flushing. A soil separation fabric was placed over the
gravel layer followed by approximately 1-foot of topsoil Inspection ports must be placed in each corner of the
bed.
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
Setting septic tank 1500-gallon, 2-compatment Valley Precast tank
Layout of laterals on sand filter
Control panel
Readings on 1/2/23 Pump Counter 379 / time elapsed meter 13.58 hours
Septic tank and ADV lids / inspection ports at front end of bed marked with wood
Inspection ports at end of be in front of trampoline
January 5, 2022
To Whom It May Concern:
We have been to the following site(s):
2395 Hwy 133, Carbondale
Pump startup has been completed.
We have verified that the system was started properly. The System went through several
cycles with no issues.
Sincerely,
Travis Nall
Service Manager
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: 2395 Highway 133, Carbondale, CO 81623 Parcel No.: _246303400002
Owner Name: Candace and Daniel Dixon Owner Phone: (970) 948-6897
Designed By: CBO, Inc. Designer Phone: (970) 309-5259
Contractor: Custom Works, Inc. Contractor Phone: (970) 948-6897
Number of Bedrooms: _4_ Minimum Tank Capacity: 1,250-gallon Minimum Absorption: 750 ft 2
OWTS PERMIT
KEEP AVAILABLE AT PROJECT SITE
Permit Number _SEPT-7272_______________________________
Permit Type X New X Repair X Remodel/addition X Tank only
Issue Date _12/17/2021____________________ Expiration Date_12/17/2022_________________
Permit Conditions:
This OWTS Permit is approved on the condition of compliance with the report and design as
submitted by CBO, Inc. dated December 2, 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 an existing three-bedroom residence and a future 1-bedroom Accessory
Dwelling Unit (ADU). The system will consist of a new, two-compartment 1,500-gallon septic tank set
level with access to grade with a high head pump in the second chamber of the tank. Effluent will be
pressure-dosed to an automatic distributing valve to distribute effluent to 750 ft2 of STA. The STA
will consist of an unlined sand filter constructed with secondary sand media, measuring 12 feet wide
by 62.5 feet long and 2 feet deep. Four distribution laterals are to be 1.5-inch Schedule 40 PVC
encased in washed gravel (6-inches below and 2-inches above), with 5/32-inch diameter orifices
facing down every 3-feet OC. Orifice shields should be installed on the laterals at each orifice.
Laterals will end with a sweeping 90-degree ell facing up with a ball valve. Inspection ports are to be
installed at each corner of the sand filter. Maintain all setbacks and elevations as designed.
Inspection ports are to be installed at the front corners of each bed and at the end of each lateral.
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.
12/17/2021
Issued By: Garfield County Environmental Health
Department
Date
832‐R‐13‐002