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Home My WebLink AboutOWTS Installation Observation 10.24.2025CBO Inc. 129 Cains Lane Carbondale, CO 81623 970.309.5259 carla.ostberg@gmail.com October 24, 2025 Project No. C1623 Dustin Cheney dustin@avalancheexcavation.net Onsite Wastewater Treatment System (OWTS) Installation Observations TBD CR 313 Garfield County, Colorado Permit SEPT-9285 Dustin, CBO Inc. observed the installation of the onsite wastewater treatment system (OWTS) on October 23, 2025 for the subject property. Avalanche Excavation installed the system. The OWTS design is based on 3-bedrooms. An average daily wastewater flow of 450 GPD was used. 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 1500-gallon, two-compartment Valley Precast concrete, traffic rated septic tank with an Orenco® Biotube Pump Vault and an Orenco® PF3005 pump in the second compartment of the septic tank. The septic tank was anchored with Deadmen. The control panel for the pump is located within line of sight of the septic tank. This office was contacted for start-up of the system to verify its functionality and performed a squirt test prior to use of the system. Effluent is pumped through a 1.5-inch diameter pump line from the pump chamber to an Orenco® automatic distributing valve (ADV), model 6403. The ADV is placed at a high point in the system in an insulated riser with access from grade. Effluent is pressure dosed to through 1.5-inch diameter distribution lines to a 10’ x 52.5’ bed. One-foot of sand filter material was installed in the over-excavated footprint, extending 1-foot on the uphill side. There is 4-feet between the infiltrative area and high seasonal groundwater. A gradation of the sand media is enclosed. Three 39” wide GeoMat™ sheets were placed on the 10-foot wide bed. Laterals, connected directly to the ADV, are 1.5-inches in diameter with 5/32-inch diameter orifices facing down, spaced 3-feet on center, installed down the center of each 39” wide GeoMat™ sheet, covered with the gray separation fabric. Each 1.5-inch diameter lateral has a sweeping ell facing up with a ball valve for flushing. Valves are placed in a 10-inch sprinkler box for access. Laterals are covered by a soil separation fabric with 1-foot of topsoil able to support vegetative growth. Inspection ports are placed at each corner of each bed. Ports are cut to grade and covered with a valve box 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: TBD County Road 313, New Castle Parcel No.: _239925400082 Owner Name: Dustin Cheney Owner Phone: (970) 379-5258 Designed By: CBO Inc. Designer Phone: (970) 309-5259 Number of Bedrooms: _3_ Minimum Tank Capacity: 1,000-gallon Minimum Absorption: 525 ft2 OWTS PERMIT KEEP AVAILABLE AT PROJECT SITE Permit Number _SEPT-9285______________________________ Permit Type X New X Repair X Remodel/addition X Tank only Issue Date _06/19/2025____________________ Expiration Date_06/19/2026_________________ Permit Conditions: This OWTS Permit is approved on the condition of compliance with the report and design as submitted by CBO Inc. May 29, 2025. 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 three-bedroom residence. The new OWTS components will consist of a new 1,500-gallon two compartment septic tank on the CDPHE approved list, set level with access to grade. A new screened high-head pump will be housed in the second chamber of the septic tank. The septic tank will be anchored according to manufacturer recommendations due to the presence of high ground water. Effluent will be dosed from the second chamber of the tank to an automatic distributing valve set at the high point of the system that will distribute effluent to 525 ft2 of STA. The new STA will consist of a 10 ft by 52.5 ft unlined sand filter bed, consisting of at least 1 foot of secondary sand media overlain by perforated distribution laterals placed in GeoMat distribution media. Distribution laterals are to be 1 ½ inch Schedule 40 PVC, with 5/32-inch orifices every 3-feet on center facing downwards with orifice shields. Each lateral is to end in a flushing valve at the distal end. The residual head (squirt height) at the end of the system is to be 5-feet. The infiltrative surface shall be no deeper than 1-foot below natural grade and final cover will be mounded to reach approximately 1.5ft of soil over the distribution laterals and sloped at a 3:1 ratio from the top of the mound to the native grade. Inspection ports are to be installed at each corner of the bed. 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. 06/19/2025 Issued By: Garfield County Environmental Health Department Date 832‐R‐13‐002