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Home My WebLink AboutOWTS Installation ObservationCBO Inc. 129 Cains Lane Carbondale, CO 81623 970.309.5259 carla.ostberg@gmail.com October 29, 2025 Project No. C1878 Bernie Colonna bernie@highcountrybd.com Onsite Wastewater Treatment System (OWTS) Installation Observations 0 CR 236 Tract B Amended Johnson Subdivision Exemption Garfield County, Colorado Permit SEPT - 8711 Bernie, CBO Inc. observed the installation of the onsite wastewater treatment system (OWTS) on April 2, 2025 and April 10, 2025 for the subject property. The homeowner installed the system. The OWTS design is based on an average daily wastewater flow of 300 GPD. The 4-inch 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 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 two gravelless chamber trenches. The distribution box is 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 15 ADS ARC 36 chambers for a total of 30 chambers and 450 square feet of infiltrative area. There are 4-feet of undisturbed soil between each trench. Inspection ports are installed at the beginning and end of each trench. Ports may be cut to grade and placed in sprinkler boxes for access. Originally, the trenches were installed too close to the west property boundary. One trench was abandoned and length added to the two existing trenches. Additionally, gravel was placed under the trenches. Approvals for gravelless chambers are contingent on placement on scarified, native soils. The gravel was removed prior to authorization of backfill. The site plan provided to use may not have had the building in the location where it was actually built. We cannot guarantee the accuracy of the site plan and building location as this does not appear to be the result of a survey. We depicted the placement of the OWTS components to the best of our ability with the information provided to us. 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: 0 County Road 236, Silt, CO 81652 Parcel No.: 217904300412 Owner Name: Pizarro Owner Phone: Not Provided Designed By: CBO Inc. Designer Phone: (970) 309-5259 Contractor: Bernie Colonna Contractor Phone: (970) 319-8706 Employees: 6 Minimum Tank Capacity: 1,000-gallon Minimum Absorption: 420 ft2 OWTS PERMIT KEEP AVAILABLE AT PROJECT SITE Permit Number _SEPT-8711_______________________________ Permit Type X New X Repair X Remodel/addition X Tank only Issue Date _07/03/2024____________________ Expiration Date_07/11/2025_________________ Permit Conditions: Permit Conditions: This OWTS Permit is approved on the condition of compliance with the design as submitted by CBO, Inc. dated April 30, 2024. Changes must be approved by Garfield County Public Health and the designer prior to construction. The new OWTS will serve a new commercial office with a toilet and a sink serving six employees. The system will consist of a new, two-compartment 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 ft2 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 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. 07/03/2024 Issued By: Garfield County Environmental Health Department Date 832‐R‐13‐002