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HomeMy WebLinkAboutOWTS Installation Observations 05.11.202133 Four Wheel Drive Road Carbondale, CO 81623 970.309.5259 carla.ostberg@gmail.com May 11, 2021 Project No. C1426 Steve Ostberg steve@rutgersconstruction.com Onsite Wastewater Treatment System (OWTS) Installation Observations 129 Cains Lane Garfield County, Colorado Permit Number SEPT-6573 Steve, CBO Inc. observed the installation of the onsite wastewater treatment system (OWTS) on numerous dates ranging from April 22 through May 10, 2021 for the subject property. Hagist Excavation installed the system. The OWTS design is based on 4-bedroom in the main residence and 1-bedroom in the accessory dwelling unit (ADU). An average daily wastewater flow of 675 GPD was used. A 4-inch diameter SDR-35 sewer line with a double sweep clean out and minimum 2% fall to the septic tank exits both the residence and ADU. An additional clean out was installed on the main house sewer line behind the ADU/Pole Barn as the length to the septic tank exceeded 100-feet. The system installation included a 1500-gallon, two-compartment Infiltrator® poly septic tank with an effluent filter on the outlet tee. Risers bring the manhole lids to grade for access. The effluent filter must be cleaned annually, or as needed. Effluent gravity flows to a distribution box, and then to six trenches. The distribution box is accessible from grade and flow equalizers have been installed on each outlet pipe in the distribution box to assure equal flow to each trench. Three of the trenches consist of 19 ‘Quick 4’ Standard Plus Infiltrator® chambers and three trenches consist of 6-inches of sand filter material (washed sand meeting specifications for Secondary Sand) and 76-feet of GeoMat™ with 4-inch perforated pipe for distribution. Chamber trenches and GeoMat™ trenches alternate. There was at least 4-feet of undisturbed soil between each trench. Inspection ports were installed at the beginning and end of each trench. Ports may be cut to grade and placed in sprinkler boxes 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 of the expertise of the installer, soil type, and weather conditions. Please call with questions. Sincerely, CBO Inc. Carla Ostberg, MPH, REHS Clean out existing ADU Sewer line from main house / run in trench with storm water drain line to drywell Additional clean out installed behind pole barn on sewer line from main house / excavation for septic tank Bedding in trench for sewer line leading to septic tank Septic tank with two sewer lines entering inlet side of tank Staking STA and removing vegetation Backfilling around septic tank Trench from distribution box to trenches distribution box Lowest trench, 6-inches sand for GeoMat™ End of trenches, alternating chambers and GeoMat™ Perforated pipe on GeoMat™ Fabric over perf pipe Inspection port at end of GeoMat™ Pipes from d-box to trenches Installation of piping in distribution box Angle on inlet of pipe into d-box GeoMat™ trench GeoMat™ Chamber end cap Splash plate on chamber end cap Layout out chamber trench Inlet side of tank (two inlet pipes) Outlet side of tank / effluent filer (handle extension added) Garfield County Public Health Garfield County Public Health 2014 Blake Ave. Glenwood Springs, CO 81601 Phone: (970) 945-6614 ext. 8150 OWTS PERMIT KEEP AVAILABLE AT PROJECT SITE Permit Number SEPT -6573 Permit Type X New X Repair X Remodel/addition X Tank only Issue Date 11/18/2020 Expiration Date 11/18/2021 For inspections, call: 970-945-6614 ext. 8150 and call the Design Engineer, if applicable Project Address 129 Cains Lane Carbondale, CO Owner Name Steve & Carla Ostberg Parcel No. 239314103010 Designed By CBO Inc. Contractor Hagist Excavation Owner Phone (970)309-5259 Designer Phone (970)309-5259 Contractor Phone (970)379-9726 Number of Bedrooms 4 + 1 ADU Minimum Tank Capacity 1500 Minimum Absorption 1350 ft2 Permit Conditions: This OWTS Permit is approved on the condition of compliance with the report and design as submitted by CBO, Inc. dated November 8, 2020. 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 new four-bedroom residence and a one -bedroom accessory dwelling unit. The system will consist of a new, two-compartment 1,550 -gallon septic tank set level with access to grade with an effluent filter in the outlet tee. Effluent will gravity flow to a distribution box set level with access to grade distributing effluent to 1368 ft2 of STA. The STA will consist of six trenches, each with 19 `Quick 4' chambers for a total of 114 chambers. Inspection ports are to be installed at the beginning and end of each trench. 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. 11/18/2020 Issued By: Garfield County Environmental Health Department Date 832‐R‐13‐002