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Home My WebLink AboutEngineer's Installation Observation 02.28.24CBO Inc. 129 Cains Lane Carbondale, CO 81623 970.309.5259 carla.ostberg@gmail.com February 28, 2024 Project No. C1579 Sarah Moore sarafina1212@gmail.com Onsite Wastewater Treatment System (OWTS) Installation Observations 335 Willow Lane Garfield County, Colorado OWTS Permit SEPT-6758 Sarah, CBO Inc. observed the installation of the onsite wastewater treatment system (OWTS) on July 27, 2021 for the subject property. Hagist Excavation installed the system. The existing septic tanks were pumped, the sides, top and bottom crushed, and the remaining void filled with onsite materials. The existing soil treatment area (STA) was abandoned in place. The OWTS design is based on 4-bedrooms in the residence and 1-bedroom in a future Accessory Dwelling Unit (ADU). An average daily wastewater flow of 675 GPD was used. A new, 4-inch SDR-35 sewer line with a double-sweep clean out and minimum 2% fall to the septic tank was installed. The sewer line from the foundation to just beyond the deck line is original and that section was not replaced. The system installation included a 2000-gallon, two-compartment Valley Precast concrete septic tank with an Orenco® Biotube Pump Vault and an Orenco® PF3005 pump in the second compartment of the septic tank. There is an effluent filter in the second compartment of the septic tank. This filter must be cleaned annually, or as needed. The septic tank was anchored with Deadmen because of the high seasonal groundwater table. The floats were set to dose approximately 90 gallons each pump cycle. The control panel for the pump is located within line of sight of the septic tank. It is located next to the electrical box to the west of the septic tank. R&A wired the pumping system. The pump and alarm were tested from the floats and everything worked properly. Effluent is pressure dosed through a 1.5-inch diameter pump line to a mounded, unlined sand filter. The sand filter is divided into two beds, each 10’ x 42.5’. The excavation for the sand filter will begin 6-inches below native grade. A minimum of 3-feet of sand filter material was installed in the over-excavated footprint, resulting in 2.5-feet of sand filter material extending above native grade. A gradation of the sand media is enclosed. Effluent is pumped through a 1.5-inch diameter pump line from the pump chamber to an Orenco® automatic distributing valve (ADV), model 6402. Where the pump line crosses the driveway, it was placed in Schedule 40 conduit. The ADV was placed a high point in an insulated riser with access from grade. Level, 1.5-inch diameter manifolds connect two laterals on each bed. Laterals must be 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 were placed 2-feet from the edges of the bed leaving 2’ 8” between center of laterals. Three 39” wide GeoMat™ sheets were placed on the 10-foot wide bed. Each 1.5-inch diameter lateral ends in a sweeping ell facing up with a ball valve for flushing. Laterals were covered by a soil separation fabric and at least 1-foot of topsoil. Inspection ports were placed into the sand filter material on each corner of the beds. The mound had a minimum 3:1 slope (horizontal:vertical). 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 Septic tank anchored with Deadmen Excavation for sewer line View of mounded sand filer ADV positioned between beds View of ADV and laterals on GeoMat / Pump line from pump chamber to ADV Pump line in Sched 40 conduit under driveway ADV and east bed ADV and west bed inlet tee Sewer line from house to tank Clean out near house Septic tank View of STA Existing septic tank abandoned C:\General Cadd 6\Gxd\wilow335.gxd -- 08/11/2008 -- 10:37 AM -- Scale 1 : 800.00 Garfield CDuisrty Public Health Garfield County Public Health 2014 Blake Ave. Glenwood Springs, CO 81601 Phone: (970) 945-6614 ext. 8150 Permit Number SEPT-6758 OWTS PERMIT KEEP AVAILABLE AT PROJECT SITE Permit Type X New X Repair X Remodel/addition X Tank only Issue Date 04/13/2021 Expiration Date 04/13/2022 For inspections, call: 970-945-6614 ext. 8150 and call the Design Engineer, if applicable Project Address: 335 Willow Lane, Carbondale, CO 81623 Parcel No.: 239335100009 Owner Name: Sarah Moore Simpson 2001 Trust Owner Phone: (970) 379-6558 Designed By: CBO, Inc. Designer Phone: (970) 309-5259 Contractor: Tim Ha ist Excavation Contractor Phone: (970) 379-9726 Number of Bedrooms: 5 Minimum Tank Capacity: 1,750-gallon Minimum Absorption: 844 ftZ Permit Conditions: This OWTS Permit is approved on the condition of compliance with the report and design as submitted by CBO, Inc. dated February 13, 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 four -bedroom residence and a new 1-bedroom ADU. The system will consist of a new, two -compartment 2,000-gallon septic tank set level with access to grade with a high -head pump in the second compartment of the new tank. Effluent will be pumped to an automatic distributing valve set at the high point of the system that will distribute effluent to 850 ftZ of STA. The new STA will consist of two 10' x 42.5' 3-feet deep unlined sand filters, utilizing secondary sand media. Distribution laterals will be placed on Geomat distribution mats placed directly on the sand. Distribution laterals are to be 1 % inch Schedule 40 PVC, with 5/32-inch orifices 3-feet on center and the laterals ending in flushing valves at the distal end of the laterals. Inspection ports are to be installed at each corner of each mound. Maintain all setbacks and elevations as designed. Contact the designer and' Garfield County Public Health, at least 43 hours prior to requesting final inspection of the invstailled system prior to ba•ckfill. 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. ZZ" v 04/13/2021 Issued By: Garfield County Environmental Health Department Date 832‐R‐13‐002