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Home My WebLink AboutOWTS Installation Observations 10.24.2025CBO Inc. 129 Cains Lane Carbondale, CO 81623 970.309.5259 carla.ostberg@gmail.com October 24, 2025 Project No. C1947 Patrick Gilson patrick@korultd.com Onsite Wastewater Treatment System (OWTS) Installation Observations TBD Divide Creek Road Garfield County, Colorado Permit SEPT-9336 Patrick, 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 4-bedrooms. An average daily wastewater flow of 525 GPD was used. The existing OWTS on the southern portion of the property was properly abandoned. 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 Infiltrator® poly septic tank with an Orenco® Biotube Effluent Filter on the outlet followed by a 500-gallon, single-compartment pump chamber with an Orenco® Biotube Pump Vault and an Orenco® PF3005 pump. Effluent filters in the septic tanks must be cleaned annually, or as needed. The floats were set to dose 85 gallons each pump cycle. The control panel for the pump is located within line of sight of the septic tank. The pump floats and alarm were tested at the time of our visit and a squirt test performed. 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 the system in an insulated riser with access from grade. Effluent is pressure dosed to through 1.5-inch diameter distribution lines to two 10’ x 40.5’ beds. Two -feet of sand filter material was installed in the over-excavated footprints. A gradation of the sand media is enclosed. Laterals are 1.5-inches in diameter with 5/32-inch diameter orifices facing down, spaced 3-feet on center, installed on the GeoMat™ with the filter fabric over the laterals. Laterals are placed 2-feet from the edges of the bed with 3.0-feet between the laterals. Laterals are connected with 1.5-inch diameter level manifolds. Three 39” wide GeoMat™ sheets were placed on the 10-foot wide beds. Each 1.5-inch diameter lateral ends in a sweeping ell facing up with a ball valve for flushing. Valves are placed in a 10-inch sprinkler box for access. Inspection ports we re 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 Existing system on southern portion of property abandoned. 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 Divide Creek Road, Silt Parcel No.: _240112400262 Owner Name: Patrick Gilson Owner Phone: (970) 309-5259 Designed By: CBO Inc. Designer Phone: (970) 309-5259 Number of Bedrooms: _4_ Minimum Tank Capacity: 1,250-gallon Minimum Absorption: 808 ft 2 OWTS PERMIT KEEP AVAILABLE AT PROJECT SITE Permit Number _SEPT-9336______________________________ Permit Type X New X Repair X Remodel/addition X Tank only Issue Date _07/16/2025____________________ Expiration Date_07/16/2026_________________ Permit Conditions: This OWTS Permit is approved on the condition of compliance with the report and design as submitted by CBO Inc. dated April 6, 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 proposed 3-bedroom residence and a future fourth bedroom. The new OWTS components will consist of a new 1,250-gallon two compartment septic tank on the CDPHE approved list, set level with access to grade and effluent installed in the outlet. A new screened high-head pump will be housed in 500-gallon pump chamber on the CDPHE approved list. Effluent will be dosed from the pump chamber to an automatic distributing valve set at the high point of the system that will distribute effluent to 810 ft2 of STA. The new STA will consist of two 10 ft by 40.5 ft unlined sand filter beds, consisting of at least 2 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 downward. 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. Inspection ports are to be installed at each corner of the beds. Maintain all setbacks and elevations as designed. The existing septic tank described by Permit SEPT-6486 must be pumped and abandoned per Garfield County OWTS Regulation 43 by crushing or removal. 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. 07/16/2025 Issued By: Garfield County Environmental Health Department 832‐R‐13‐002