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HomeMy WebLinkAbout136 Sage Grouse - 210716406001Environmental Health Department P.O. Box 179 500 Broadway Eagle, CO 81631-0179 Phone: (970) 328-8730 Fax: (970) 328-7185 Permit Permit No. OWTS-023679-2022 Permit Type: OWTS Permit Work Classification: New Permit Status: Active Issue Date: 3/24/2022 Expires: 1/23/2023 On-Site Wastewater Treatement System Project Address Parcel Number 136 SAGE GROUSE TRL, EDWARDS AREA,210716406001 Owner Information Address Jeffrey & Rebecca Christoff Phone: (513) 678-1856 Cell: Email: jchristoff@deloitte.com Inspections: For Inspections Call: (970) 328-8755 Engineer Phone Email KUMAR & ASSOCIATES, Dave Young (970) 945-7988 dyoung@kumarusa.com Contractor License Number Phone Email Permitted Construction / Details: Install the new system exactly as depicted in the Kumar and Associates design dated July 9th, 2021, stamped and signed on July 12th, 2021 by David A Young, PE. The new system will be sized to accommodate the maximum daily flows for a 5 bedroom residence. This OWTS consists of one sewer line from the residence. A Valley Precast 1,500 gallon, three-compartment septic tank with a total volume of 2,000 gallons will be used with an Orenco PF3005 submersible effluent pump, or equivalent, enclosed in an Orenco Biotube Pump Vault in the third compartment. The pump floats will be set to pump 100 gallons per dose. The soil treatment area is a 2 foot mounded sand filter. The mound consists of a one foot thick gravel bed with a distribution area of 62.5 feet long by 12 feet wide. The sand filter should be sloped at 3 horizontal to 1 vertical or flatter. The basal area should be 62.5 feet long by 27.5 feet wide. Gradation analysis must confirm that sand is secondary sand media. Do not install in wet or frozen ground. A licensed installer has not been identified. No person shall install, renovate, or repair an OWTS in Eagle County (EC) without a valid EC Systems Contractor License. Any person that conducts a business as a systems contractor without having obtained a valid license section commits a Class 1 petty offense as defined in section 18-1.3-503, C.R.S. Please notify the department when an installer is identified, prior to installation of the OWTS. Contact Eagle County Environmental Health and the design engineer well in advance of requesting inspections prior to backfilling any component of the OWTS. The design engineer is responsible for conducting all inspections necessary to certify the installation and assure the functionality of the system. System certification, along with photos and a record drawing is required to be submitted to and approved by Eagle County Environmental Health prior to the use of the system. Wednesday, August 10, 2022 1 THIS PERIMT EXPIRES BY TIME LIMITATION AND BECOMES NULL AND VOID IF THE WORK AUTHORIZED BY THE PERMIT IS NOT COMMENCED WITHIN 120 DAYS OF ISSUANCE, OR BEFORE THE EXPIRATION OF AN ASSOCIATED BUILDING PERMIT Issued by: Environmental Health Department, Eagle County, CO Danielle Salinsky Date March 24, 2022 CONDITIONS 1. 2.ALL INSTALLATIONS MUST COMPLY WITH ALL REQUIREMENTS OF THE EAGLE COUNTY PUBLIC HEALTH AGENCY ON-SITE WASTEWATER TREATMENT SYSTEM REGULATIONS ADOPTED PURSUANT TO AUTHORITY GRANTED IN CR.S. 25-10-101, et seq., AS AMENDED 3.THIS PERMIT IS VALID ONLY FOR PERFORMING WORK ON OWTS ASSOCIATED WITH STRUCTURES WHICH HAVE FULLY COMPLIED WITH COUNTY ZONING AND BUILDING REQUIREMENTS CONNECTION TO, OR USE WITH, ANY DWELLING OR STRUCTURE NOT APPROVED BY THE ZONING AND BUILDING DEPARTMENTS SHALL AUTOMATICALLY BE A VIOLATION OF A REQUIREMENT OF THE PERMIT AND WILL RESULT IN BOTH LEGAL ACTION AND REVOCATION OF THE PERMIT4.1.6(A)(1) EAGLE COUNTY PUBLIC HEALTH AGENCY ON-SITE WASTEWATER TREATMENT SYSTEM REGULATIONS REQUIRES ANY PERSON WHO CONSTRUCTS, ALTERS OR INSTALLS AN ON-SITE WASTEWATER TREATMENT SYSTEM TO BE LICENSED Wednesday, August 10, 2022 2 *************************************************************************** APPLICATION FOR ON-SITE WASTEWATER TREATMENT SYSTEM (OWTS) PERMIT INCOMPLETE APPLICATIONS MAY NOT BE ACCEPTED (SITE PLAN MUST BE INCLUDED) FEE SCHEDULE APPLICATION FEE FOR NEW OWTS OR MAJOR REPAIRS $800.00 MINOR REPAIR FEE $400.00 Fee includes the design review, permitting and maintenance of OWTS records Make all checks payable to: Eagle County Treasurer Property Owner: _______________________________________Phone: ________________________ Owner Mailing Address: ________________________________ email: _________________________ Professional Engineer: __________________________________ Phone: ________________________ Applicant / Contact Person: ______________________________Phone: ________________________ Licensed Systems Contractor Name / Company: ___________________________________________ Contractor Mailing Address: _________________________________ Contractor License #:_______ Contractor Phone Number: ________________________ email: ______________________________ OWTS Permit Application is for: ____ New Installation ____ Alteration ____ Repair Tax Parcel Number: _________________________________ Lot Size: ________________________ Assessor’s Link: www.eaglecounty.us/patie/ Physical Address: _____________________________________________________________________ Legal Description: ____________________________________________________________________ Building Type: _____ Residential / Single Family _____ Residential / Multi Family _____ Commercial / Industrial Number of Bedrooms: ______ Number of Bedrooms: ______ Type of Use: _______________ *As of 06/27/2014, all systems require design by a Registered Professional Engineer. Type of Water Supply: ____ Private Well ____ Spring ____ Surface ____ Public If Public, Name of Supplier: ____________________________________________________________ Applicant Signature: ______________________________________Date:_______________________ **************************************************************************** Office Use Only: OWTS PERMIT # __________________ BUILDING PERMIT # ____________________ Amount Paid: ___________ Receipt #: ___________ Check #: ___________ Date: ______________ DEPARTMENT OF ENVIRONMENTAL HEALTH (970) 328-8755 FAX: (970) 328-8788 TOLL FREE: 800-225-6136 www.eaglecounty.us P.O. Box 179 500 Broadway Eagle, CO 81631 environment@eaglecounty.us Jeff Christoff 513-678-1856 1788 MACKENZIE TRCE BATAVIA, OH 45103-8670 jchristoff@deloitte.com David Young / Kumar & Assoc. 970-945-7988 Sean McGinley - MMH 970-471-8202 TBD 2107-164-06-001 3.205 acres 136 Sage Grouse Trail, Cordillera, CO 81632 CORDILLERA SUB FIL 36 Block: 2 Lot: 1 5 Eagle River Water & San District 03 / 14 / 2022 Inspection Result Eagle County, Colorado P.O. Box 179 500 Broadway Eagle, CO Phone: (970) 328-8730 Fax: (970) 328-7185 IVR Phone: 1-866-701-3307 Inspection Number: INSP-524897-2023 Permit Number: OWTS-023679-2022 Inspection Date: 08/25/2023 Inspector: Weems, Kirk Permit Type: OWTS Permit Inspection Type: OWTS Final Inspection Work Classification: NewOwner:Jeffrey & Rebecca Christoff Job Address:136 SAGE GROUSE TRL IVR Pin Number:195536 EDWARDS AREA, CO Project:<NONE> Parcel Number:210716406001 Contractor:Phone: / Cell: Inspection Status: Approved Inspection Notes Pre-Backfill performed on 08/25/23 - Need gradation analysis for mound sand. Inspector Comments Added Item: Septic Tank Confirm 5'6" setback from building. A Valley Precast 1,500 gallon, three-compartment septic tank with a total volume of 2,000 gallons was installed with an Orenco PF3005 submersible effluent pump enclosed in an Orenco Biotube Pump Vault in the third compartment. Added Item: Record Drawing Received 9/22/2023 from K&A. Added Item: Record Photos Received 9/22/2023 from K&A. Added Item: Site and Soil Received 3/16/2022. Added Item: Final Certification Letter Received 9/22/2023 from K&A. Added Item: General Plan Received 3/16/2022. 8/25/23 - Pre-backfill inspection performed. All components installed according to plan. Fabric on site for covering STA prior to backfill. Added Item: Soil Treatment Area (STA) 8/25/23 - STA sand and gravel installed according to plan. Need Sand Gradation analysis. Brought this up with GC while on site for inspection. 9/22/2023 Gradation analysis received. The soil treatment area is a 2 foot mounded sand filter. The mound consists of a one foot thick gravel bed with a distribution area of 62.5 feet long by 12 feet wide. The basal area is 62.5 feet long by 27.5 feet wide. Monday, September 25, 2023 For more information visit: http://www.eaglecounty.us Page 1 of 2 Added Item: Identification of Systems Contractor 8/25/23 - JV Excavating Monday, September 25, 2023 For more information visit: http://www.eaglecounty.us Page 2 of 2 5020 County Road 154 Glenwood Springs, CO 81601 phone: (970) 945-7988 fax: (970) 945-8454 email: kaglenwood@kumarusa.com www.kumarusa.com Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado September 20, 2023 Allen-Guerra Architecture Attn: Suzanne Allen Sabo P.O. Box 5540 Frisco, Colorado 80443 suzzanne@allen-guerra.com Project No. 21-7-486 Permit No. OWTS-023679-2022 Subject: Certification of Onsite Wastewater Treatment System, Proposed Christoff Residence, Lot 1, Block 2, Filing 36, Cordillera, 136 Sage Grouse Way, Eagle County, Colorado Dear Suzanne: A representative of Kumar & Associates observed the installation of the Onsite Wastewater Treatment System (OWTS) for the residence at the subject site as required by the Eagle County Environmental Health Department. Our observations and recommendations are presented in this report. The services are supplemental to Kumar & Associates agreement for professional services to Allen-Guerra Architecture dated May 26, 2021. We previously designed the OWTS for the residence as submitted in our report dated July 9, 2021, Project No. 21-7-486. The system was designed for five bedrooms. The OWTS was installed by Meadow Mountain Homes under Permit No. OWTS-023679-2022. We performed our as-built evaluations on August 11, 28 and 29, 2023. The OWTS components observed included: sewer line, cleanout, septic tank, effluent line, pump, control panel and soil treatment area (STA) and the locations of these components. The installation and locations of the system components were verified as shown on Figure 1. Pictures of the OWTS components made during the site visits are included with this report. The distance locations to the septic tank shown on Figure 1 were made by taping. On June 21, 2023, a sample of the secondary sand media was obtained and the results of gradation analysis test are attached. On August 29, 2023, after power had been supplied to the pump, a pump performance test was performed with adequate pump pressure observed. It is our opinion that the OWTS was installed in general conformance with the above-referenced design. The observations and recommendations presented above are based on our site observations and our experience in the area. We make no warranty either express or implied. Alterations to the system or improper backfill and site grading could affect the operation and effectiveness of the OWTS. Kumar & Associates GRADATION ANALYSIS TEST LABORATORY TEST REPORT DATA Laboratory Client: Location / Plant: Sample / Product: Sample Date: Lab Test Date: Job Number: SIEVE SIEVE OPENING IN MILLIMETERS PERCENT PASSING THRU SIEVE 3"75 100.0 1.5 37.5 100.0 3/4"19 100.0 3/8"9.5 100.0 No. 4 4.75 100.0 No. 8 2.36 81.0 No. 16 1.18 64.0 No. 30 0.6 45.0 No. 50 0.3 19.0 No. 100 0.15 6.0 No. 200 0.075 2.0 GRADATION RESULTS COMPARED TO PREFERRED AND SECONDARY SAND FILTER SPECIFICATIONS Value Units Preferred Sand Value Pass / Fail Preferred Sand Secondary Sand Value Pass / Fail Secondary Sand 1.06 millimeters 0.196 millimeters 0.25 to 0.60 FAIL 0.15 to 0.60 PASS 5.39 unitless ratio < or = 4.0 FAIL < or = 7.0 PASS 2.0 millimeters < or = 3 PASS < or = 3 PASS Uniformity Coefficient (D60 / D10) Percent passing thru #200 Sieve 06/21/2023 21-7-486 Parameter D60 - Diameter that 60 percent of the sample is finer than. Effective Size - D10 - Diameter that 10 percent of the sample is finer than. Kumar Glenwood Springs Allen-Guerra Architecture Western Slope Materials - Silt Secondary Sand 06/21/2023 0 10 20 30 40 50 60 70 80 90 100 0.01 0.1 1 10 100Percent Passing SieveDiameter of Particle in Millimeters Plot of Gradation Analysis 3"1.5"3/4"3/8"#4#8#30#50#100#200 #16 OWTS PHOTOGRAPH LOG CHRISTOFF RESIDENCE LOT 1, BLOCK 2, FILING 36, CORDILLERA 136 SAGE GROUSE WAY EAGLE COUNTY, COLORADO Project No. 21-7-486 Photograph 1: Sewer line exiting residence, cleanout, and Valley Precast 1,500-gallon, 3 chamber septic tank. Photograph 2: Sewer line entering tank and inlet tee. OWTS PHOTOGRAPH LOG CHRISTOFF RESIDENCE LOT 1, BLOCK 2, FILING 36, CORDILLERA 136 SAGE GROUSE WAY EAGLE COUNTY, COLORADO Project No. 21-7-486 Photograph 3: Pump installed in the third chamber of the septic tank. Photograph 4: 1.5” Schedule 40 effluent transport line exiting septic tank to soil treatment area (STA). OWTS PHOTOGRAPH LOG CHRISTOFF RESIDENCE LOT 1, BLOCK 2, FILING 36, CORDILLERA 136 SAGE GROUSE WAY EAGLE COUNTY, COLORADO Project No. 21-7-486 Photograph 5: Soil treatment area (STA): aggregate bed distribution cell over sand filter. Photograph 6: Control panel. 5020 County Road 154 Glenwood Springs, CO 81601 phone: (970) 945-7988 fax: (970) 945-8454 email: kaglenwood@kumarusa.com www.kumarusa.com Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado ONSITE WASTEWATER TREATMENT SYSTEM DESIGN PROPOSED CHRISTOFF RESIDENCE LOT 1, BLOCK 2, FILING 36, CORDILLERA 136 SAGE GROUSE WAY EAGLE COUNTY, COLORADO PROJECT NO. 21-7-486 JULY 9, 2021 PREPARED FOR: ALLEN-GUERRA ARCHITECTURE ATTN: SUZANNE ALLEN SABO P. O. BOX 5540 FRISCO, COLORADO 80443 (suzzane@allen-guerra.com) Kumar & Associates, Inc. Project No. 21-7-486 TABLE OF CONTENTS INTRODUCTION .......................................................................................................... - 1 - PROPOSED CONSTRUCTION .................................................................................... - 1 - SITE CONDITIONS ....................................................................................................... - 1 - SUBSURFACE CONDITIONS ..................................................................................... - 1 - OWTS ANALYSIS ........................................................................................................ - 2 - DESIGN RECOMMENDATIONS ................................................................................ - 3 - SOIL TREATMENT AREA....................................................................................... - 3 - OWTS COMPONENTS ............................................................................................. - 4 - OWTS OPERATION AND MAINTENANCE.............................................................. - 7 - OWTS HOUSEHOLD OPERATION ........................................................................ - 7 - OWTS MAINTENANCE ........................................................................................... - 8 - OWTS CONSTRUCTION OBSERVATION ................................................................ - 8 - LIMITATIONS ............................................................................................................... - 8 - FIGURE 1 OWTS SITE PLAN FIGURE 2 SOIL TREATMENT AREA CALCULATIONS FIGURE 3 SOIL TREATMENT AREA PLAN VIEW FIGURE 4 SOIL TREATMENT AREA CROSS SECTION FIGURE 5 CLEANOUT DETAIL ATTACHMENTS VALLEY PRECAST SEPTIC TANK DETAIL ORENCO ORIFICE SHIELD TECHNICAL DATA SHEET ORENCO PF3005 EFFLUENT PUMP CURVE Kumar & Associates, Inc. Project No. 21-7-486 INTRODUCTION This report provides the results of an onsite wastewater treatment system (OWTS) design for the proposed Christoff residence to be located on Lot 1, Block 2, Filing 36, Cordillera, 136 Sage Grouse Way, Eagle County, Colorado. The purpose of this report was to provide design details for the OWTS in accordance with the 2018 Eagle County Onsite Wastewater Treatment System Regulations and the Colorado Department of Public Health and Environment’s Regulation #43. The study was performed in accordance with our agreement for professional services to Allen- Guerra Architecture dated May 26, 2021. PROPOSED CONSTRUCTION The proposed residence will be a five-bedroom structure with a walkout basement level and an attached garage located on the lot as shown on Figure 1. The proposed OWTS soil treatment area (STA) will be located to the west of the residence. Water service will be provided to the residence by the public water supply from Sage Grouse Way to the northeast of the residence. If proposed construction is different than that described, we should be contacted to re-evaluate our design recommendations. SITE CONDITIONS The lot was vacant at the time of field exploration and the ground surface appeared mostly natural. The terrain at the proposed STA location slopes moderately steeply down to the west at grades of about 15 to 20%. Vegetation consists of grass and sagebrush. Basalt flow outcrops are visible on the lot. No surface water features were observed in the near vicinity of the lot. The water service line supply to the residence will be from the end of Sage Grouse Way and located well outside the required 25 feet minimum set-back from the OWTS. We are not aware of any nearby water wells. SUBSURFACE CONDITIONS The field exploration for the OWTS was conducted on December 11, 2018. Three profile pits (Profile Pits 1, 2 and 3) were excavated with a mini-trackhoe at the approximate locations shown on Figure 1 to evaluate the subsurface conditions. The pits were logged by a representative of Kumar & Associates. Logs of the profile pits are provided below. - 2 - Kumar & Associates, Inc. Project No. 21-7-486 Log of Profile Pit 1 Depth USDA Classification 0-1’ TOPSOIL; gravelly organic Loam, loose, moist, dark brown. 1’-1½’ BASALT FLOW; hard, slightly moist, gray. • Bottom of pit @ 1½ feet where digging refusal with the mini-excavator occurred. • No free water or redoximorphic features observed at time of excavation. Log of Profile Pit 2 Depth USDA Classification 0-½’ TOPSOIL; gravelly organic Loam, loose, moist, dark brown. ½’-1’ BASALT FLOW; hard, slightly moist, gray. • Bottom of pit @ 1 foot where digging refusal with the mini-excavator occurred. • No free water or redoximorphic features observed at time of excavation. Log of Profile Pit 3 Depth USDA Classification 0-1’ TOPSOIL; gravelly organic Loam, loose, moist, dark brown. 1’-1½’ BASALT FLOW; hard, slightly moist, gray. • Disturbed bulk sample taken from ½ to 1 foot. • Bottom of pit @ 1½ foot where digging refusal with the mini-excavator occurred. • No free water or redoximorphic features observed at time of excavation. The soils encountered consisted of about ½ to 1 foot of organic topsoil overlying hard basalt flow that extended down to the depths explored of 1 to 1½ feet. Practical digging refusal was encountered with the mini-excavator in the basalt flow material due to its hardness. No free water was encountered in the pits nor indications of seasonal high groundwater were observed at the time of the pit excavations. Based on the subsurface conditions, the soils have been classified as Soil Type R-1; Option 1 and Soil Type 3 per State regulations, which equates to a long-term acceptance rate (LTAR) of 0.35 gallons per square foot per day. No free water was encountered in the pits at the time of excavation and no indications of seasonal high groundwater were observed in the soil profiles. OWTS ANALYSIS Based on the site conditions, profile pit evaluations and our experience in the area, an aggregate bed overlying a minimum 2 feet thick mounded sand filter is needed to provide adequate treatment of the effluent from the residence. The sand filter is needed due to the excessive rock content of the subsoils. The STA aggregate bed will be sized for five bedrooms (eight persons) using an LTAR of 0.8 gallons per square foot per day for the imported “secondary sand media”. - 3 - Kumar & Associates, Inc. Project No. 21-7-486 The STA basal area of the sand will be sized for Soil Type 3 with an LTAR of 0.35 gallons per square foot per day. The sewage will gravity flow from the residence to the septic tank for primary treatment then be pressured dosed on a regular basis to the STA for dispersal and final treatment. DESIGN RECOMMENDATIONS The design recommendations presented below are based on the proposed construction, the site and subsurface conditions encountered, and our experience in the area. If conditions encountered during construction are different than those that are described in this report, please contact us and we will re-evaluate our design recommendations. SOIL TREATMENT AREA • The STA will consist of a 1 foot thick aggregate (gravel) bed that is 62.5 feet long by 12 feet wide (750 square feet) constructed on a two feet thick mounded sand filter. The aggregate area is sized based on an LTAR of 0.8 gallons per square foot per day for the sand filter. A pressure distribution system will be used to dose the effluent to the STA at regular intervals. • The minimum basal area of the mounded sand filter is 62.5 feet long by 27.5 feet wide (1,719 square feet). The mounded sand filter basal area is sized based on an LTAR of 0.35 gallons per square foot per day for Soil Type 3. • The base of the aggregate bed must be above existing grade. • Soil treatment area calculations are shown on Figure 2. • The sand media will be placed on the scarified native ground surface. • Vegetation should be removed and the surface scarified in the existing ground surface that is to be under the STA. • Sand filter material should extend one foot horizontally from the perimeter of the aggregate bed and then be sloped at 3 Horizontal to 1 Vertical (3H:1V) maximum in all directions. • The sand filter media should meet the requirements of the current Eagle County OWTS Regulations for “secondary sand media”. ASTM C33 concrete sand is suitable for the filter media. A sample of the sand filter media should be obtained with about 1 month prior to installation for gradation analysis with the sample provided to us for testing or the test results provided to us for approval of the material. • The sand filter material shall be placed in lifts not exceeding 10 inches thick. Each lift shall be track or bucket compacted until settlement ceases. - 4 - Kumar & Associates, Inc. Project No. 21-7-486 • Distribution lines, consisting of 1.5-inch diameter, Schedule 40 piping, with ⅛-inch diameter orifice holes drilled at 3-foot centers, should be installed in the aggregate bed, see Figure 3. The orifice holes should face down. • Orenco Orifice Shields, or equivalent, should be installed on the effluent distribution piping within the aggregate bed at each orifice location to limit potential masking holes by the gravel. A technical data sheet of the shields is provided as an attachment. • A minimum of 12 inches and a maximum of 24 inches of cover soil should be placed over the STA. Prior to placement of cover soil, a Hanes Geocomponents Pro Silver 2 ounce/square yard filter fabric, or equivalent, should be placed over the gravel. Mirafi 140N or 160N filter fabric is not suitable for this use. • Backfill should be graded to deflect surface water away from the STA and should be sloped at 3 Horizontal to 1 Vertical (3H:1V) maximum in all directions. • Disturbed ground should be re-vegetated as soon as possible with a native grass mix. No trees, shrubs or other plants with deep roots should be planted on or near the STA as this may damage the system piping. • Four-inch diameter inspection ports should be installed vertically into each corner and in the middle of the aggregate bed. The inspection ports should extend at least 8 inches above the finished ground surface or be protected in a valve box at finished grade. The portion that lies within the gravel should be perforated. • The STA must be a minimum of 20 feet from the residence. • The STA must be a minimum of 25 feet from potable water supply line. • The STA must be a minimum of 10 feet from any property line. • A plan view of the STA is presented on Figure 3 and a cross section of the STA is presented on Figure 4. • Cleanouts must be installed in each of the distribution lines in the STA. A typical cleanout detail is provided as Figure 5. OWTS COMPONENTS Recommended OWTS components provided below are based on our design details and our experience with the specific component manufacturers. Equivalent components may be feasible but need to be approved by us prior to construction. Septic Tank • A Valley Precast 1,500 gallon, three-chamber septic tank, or equivalent, is proposed for primary treatment and dosing. A detail of the tank is provided as an attachment to the report. - 5 - Kumar & Associates, Inc. Project No. 21-7-486 • A submersible effluent pump enclosed in a Biotube Pump Vault will be installed in the third chamber. • The tank must be a minimum of five feet from the residence and from the STA. The tank must be a minimum of 10 feet from any potable water supply lines. • The tank must be set level. The excavation bottom must be free of large rocks or other objects that could damage the tank during placement. A road base or gravel bedding material will likely be needed to prevent tank damage during placement and act as a leveling course. • The tank lids must extend to final surface grade and made to be easily located. • Install the tank with 2 feet minimum cover soil for frost protection. Maximum tank soil cover is 4 feet. Sewer Pipe • The sewer line to the septic tank should not be less than the diameter of the building drains and not less than 4 inches in diameter. • The sewer pipes should have a rating of SDR35 or stronger. • The sewer pipe should be sloped between 2% to 4% to help limit disturbance of solids in the tank and potential sewage bypass of the first chamber of the tank. If a steeper slope is needed, this can be accomplished with vertical step-downs in the sewer line. • A minimum 36 inches of cover soil should be provided over the sewer pipes. Paved areas, patios or other areas without vegetative cover may be more susceptible to frost. We recommend 48 inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with 2-inch-thick blue foam insulation board. If adequate soil cover is not possible, we should be contacted for re-evaluation prior to installation. • Schedule 40 PVC pipe is required underneath driveway surfaces and should be provided with at least 48 inches of soil cover, and be insulated on top and sides with 2-inch thick rigid foam insulation board. • The sewer pipe should be bedded in compacted ¾-inch road base or native soils provided that the native soils contain no angular rocks or rocks larger than 2½ inches in diameter to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and damage piping. • Install cleanout pipes within 5 feet of the building foundations, where the sewer pipes bend 90 degrees or more and every 100 feet of sewer pipe. • All 90-degree bends should be installed using a 90-degree long-sweep or by using two 45-degree elbows. - 6 - Kumar & Associates, Inc. Project No. 21-7-486 • The sewer line location shown on Figure 1 is considered conceptual. We assume that there will be only one sewer line exiting the residence. It is the responsibility of the owner/contractors to locate all sewer line exit locations and connections to the septic tank. We should be notified if there are other sewer lines exiting the residence. Effluent Transport Piping • 1.5 inch diameter Schedule 40 effluent transport piping should be sloped at 2% minimum to drain to the STA manifold from the dose chamber. • The effluent transport pipe should be bedded in compacted ¾-inch road base or native soils provided that the native soils contain no angular rocks or rocks larger than 2½ inches in diameter to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and damage piping. • A minimum 18 inches of cover soil should be provided over the effluent transport pipe. Paved areas, patios or other areas without vegetative cover may be more susceptible to frost. We recommend 48 inches of soil cover over the effluent pipe and insulation with at least 2 inches of rigid foam insulation in these areas. If adequate cover soil is not possible, we should re-evaluate soil cover prior to installation. • The effluent pipe should be double encased with larger diameter Schedule 40 PVC pipe underneath driveway surfaces and be provided with at least 48 inches of soil cover and be insulated on top and sides with 2-inch-thick foam insulation board. • All 90-degree bends should be installed using a 90 degree long-sweep or by using two 45-degree elbows. Effluent Pumping System • An Orenco PF3005, 115 volt, submersible effluent pump with a 1.25 inch diameter discharge assembly, or equivalent, will be required for effluent pumping. • The pump should be enclosed in an Orenco Biotube Pump Vault for effluent filtering and to protect the pump from vibration. • The maximum effluent transport distance from the pump discharge to the manifold is estimated to be 50 feet. • The elevation difference from pump discharge to the STA manifold is estimated to be 4 feet. • An equivalent pump must be capable of operating at 24.7 gallons per minute at 17.8 feet of total dynamic head. A pump performance curve is provided as an attachment to this report. • The floats should be set to provide a dose volume of approximately 100 gallons. To achieve the desired dose volume, the upper (“ON”) and lower (“OFF”) floats should be set approximately 10 inches apart. - 7 - Kumar & Associates, Inc. Project No. 21-7-486 • The high-water alarm float should be placed approximately 3 inches above the pump “ON” float in the dose chamber. The high-water alarm must be wired on a separate electrical circuit from the pump. • The flow differential between the first and last orifices is estimated to be 0.9%. • An ⅛-inch diameter weep hole should be drilled in the effluent transport line prior to exiting the dose chamber of the septic tank so the transport line can drain after each pumping cycle. OWTS OPERATION AND MAINTENANCE The OWTS will require periodic inspection and maintenance to function properly. A properly designed, installed and maintained system can greatly increase its lifespan. The level of maintenance will vary depending on the complexity of the system and water use habits of the residents. We recommend that an OWTS Operation and Maintenance (O&M) Manual be developed. Depending on the complexity of the system a contract with an OWTS maintenance provider may be prudent. Below are some basic recommendations for the OWTS O&M. OWTS HOUSEHOLD OPERATION The OWTS will require periodic inspection and maintenance to function properly. A properly designed, installed and maintained system can greatly increase its lifespan. The level of maintenance will vary depending on the complexity of the system and water use habits of the residents. Below are some basic recommendations for the OWTS O&M. • Use of high efficiency water fixtures is recommended to decrease the hydraulic load on the OWTS system. • Fix plumbing leaks immediately as this may cause a hydraulic overload of the STA. • Do not irrigate the area on top of or directly upgradient of the STA as this may cause a hydraulic overload. • Do not dispose of household waste down household drains as this may clog or damage OWTS components. Examples of household waste includes: dental floss, cotton swabs, coffee grounds, paper towels, feminine products and many other kitchen and bath items. • Use of kitchen garbage disposals is not recommended. If a garbage disposal is utilized, kitchen wastewater should be screened thoroughly. Many kitchen solids are not decomposed in the septic tank and may cause increased tank pumping frequency. • Do not dispose of household chemicals, greases, oils, paints, hot tub water or water softener backwash in household drains. A separate drywell, if feasible, may be necessary for hot tub water or water softener backwash disposal. • Limit the use of bleach as this may harm useful bacteria in the septic tank and STA. - 8 - Kumar & Associates, Inc. Project No. 21-7-486 • Liquid dishwasher and clothes washer detergent is recommended for households served by an OWTS. Clay substances used as fillers in powder detergents may result in clogging of the STA. • The effluent in septic tanks can freeze during extended periods of non-use in cold weather. We recommend that a tank heater be installed in this system to help prevent freezing. OWTS MAINTENANCE • Inspect the septic tank, effluent pump, effluent pump vault filter and soil treatment area at least annually for problems or signs of failure. • The pump vault filter should be cleaned annually by spray washing solids into the first chamber of the septic tank. • Septic tank should be pumped and cleaned every 3 to 5 years depending on use. Longer pumping intervals may increase the amount of solids that reach the soil absorption area, which may shorten its life span. • Pumping of the septic tank should take place when the level of the sludge and scum layers combined take up 25 to 33% of the capacity of the first chamber of the tank. OWTS CONSTRUCTION OBSERVATION The Eagle County Environmental Health Department requires that the designer of the system provide a record drawing and certification of the OWTS construction (As-Built). We should be provided with at least 48-hour notice prior to the installer needing the inspections. Prior to issuance of our certification letter, we require observation of all system components prior to backfill. The number of site visits required for the inspection will depend on the installer’s construction schedule. LIMITATIONS We have conducted this design in accordance with generally accepted engineering principles and practices in this area at this time. We make no warranty either expressed or implied. The recommendations provided in this report are based on the site conditions, profile pit evaluations, soil texture analysis, the proposed construction and our experience in the area. Variations in the subsurface conditions may not become evident until excavation is performed. If conditions encountered during construction appear different from those described in this report, we should be notified so that re-evaluation of the recommendations may be made. This report has been prepared for the exclusive use by our client for design purposes. We are not responsible for technical interpretations by others of our information. As the project evolves, we Kumar & Associates Kumar & Associates Kumar & Associates 1' THICK LAYER OF 1.5"SIZE AGGREGATE WITH8.5" BELOW PIPES AND2" ABOVE PIPES. AGGREGATE BEDMUST BE ABOVE EXISTING GRADE.HANES GEOCOMPONENTS PROSILVER FILTER FABRIC, OREQUIVALENT, OVER AGGREGATE BEDNATIVE SOILSREMOVE VEGETATION AND SCARIFYUPPER 6" OF GROUND SURFACEPRIOR TO SAND PLACEMENT SAND FILTER27.5' MINIMUMBASAL WIDTH1'12.0'4" DIAMETEROBSERVATION PORT10" MIN. COVER SOIL.3H:1V MAX. SLOPE.2.0' MIN. SANDFILTER UNDERAGGREGATE BEDUPHILL SWALE TO DIVERTSURFACE WATER1'Kumar & Associates Install 6" valve box at ground surface Insulate lid with 2" blue board 1.5" Sch. 40, threaded cap 1.5" Sch. 40, 90° long-sweep or two 45° elbows Backfill valve box to bottom of cap with onsite soil Orenco Orifice Shields Ground Surface Cover Soil Aggregate Bed Sand Media Kumar & Associates Orenco Systems® Inc. , 814 Airway Ave., Sutherlin, OR 97479 USA • 800-348-9843 • 541-459-4449 • www.orenco.com NTD-SF-OS-1 Rev. 2.0, © 03/17 Page 1 of 1 Orifice Shields Technical Data Sheet General Orenco Orifice Shields snap-fit onto laterals. They may be placed on top of or beneath a lateral, depending on the location of the orifice. Orifice shields are covered by method-of-use patent # 5,360,556. Standard Models OS075, OS100, OS125, OS150, OS200 Product Code Diagram Material of Construction PVC per ASTM D-1784 Physical Specifications Model Shield O.D. Lateral pipe O.D. in. (mm) in. (mm) OS075 3.5 (89) 1.05 (27) OS100 3.5 (89) 1.315 (33) OS125 3.5 (89) 1.66 (42) OS150 4.5 (114) 1.90 (48) OS200 4.5 (114) 2.375 (60) Applications Orenco® Orifice Shields are used in a pressurized distribution system to protect the orifices from backfill debris that might cause orifice blockage. Orifice shield installed on lateral pipe, standard configuration Shield Orifice Cutaway view, standard configuration Shield Orifice Cutaway view, cold weather configuration OS Lateral pipe size, nominal: 075 = 0.75 in. (20 mm) 100 = 1.00 in. (25 mm) 125 = 1.25 in. (32 mm) 150 = 1.50 in. (40 mm) 200 = 2.00 in. (50 mm) Orifice shield Pump Selection for a Pressurized System - Single Family Residence Project 21-7-486 / 136 Sage Grouse Way Parameters Discharge Assembly Size Transport Length Transport Pipe Class Transport Line Size Distributing Valve Model Max Elevation Lift Manifold Length Manifold Pipe Class Manifold Pipe Size Number of Laterals per Cell Lateral Length Lateral Pipe Class Lateral Pipe Size Orifice Size Orifice Spacing Residual Head Flow Meter 'Add-on' Friction Losses 1.25 50 40 1.50 None 4 6 40 1.50 3 56.5 40 1.50 1/8 3 5 None 0 inches feet inches feet feet inches feet inches inches feet feet inches feet Calculations Minimum Flow Rate per Orifice Number of Orifices per Zone Total Flow Rate per Zone Number of Laterals per Zone % Flow Differential 1st/Last Orifice Transport Velocity 0.43 57 24.7 3 0.9 3.9 gpm gpm % fps Frictional Head Losses Loss through Discharge Loss in Transport Loss through Valve Loss in Manifold Loss in Laterals Loss through Flowmeter 'Add-on' Friction Losses 4.3 1.8 0.0 0.1 0.1 0.0 0.0 feet feet feet feet feet feet feet Pipe Volumes Vol of Transport Line Vol of Manifold Vol of Laterals per Zone Total Volume 5.3 0.6 17.9 23.8 gals gals gals gals Minimum Pump Requirements Design Flow Rate Total Dynamic Head 24.7 15.3 gpm feet 0 5 10 15 20 25 30 35 40 0 50 100 150 200 250 300 Net Discharge (gpm) PumpData PF3005 High Head Effluent Pump 30 GPM, 1/2HP 115/230V 1Ø 60Hz, 200V 3Ø 60Hz Legend System Curve: Pump Curve: Pump Optimal Range: Operating Point: Design Point: