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Home My WebLink About1.00 ApplicationGarfield County Community Development Department 108 8th St reet, Suite 401 Glenwood Springs, CO 81601 (970) 945-8212 www.garfield-county.com TYPE OF APPLICATION l Administrative Rev ie w I ]Limited Impact Review □Majo r Impact Review C]Amendments to an []r oved LUCP O uR O M1R sup R ;no, Tempo,a,y Housing Fadllty acation of a County Road/Public ROW ocation and Extent Review □comprehens ive Pla n Amend men~ □Pipe li ne Development LAND USE CHANGE PERMIT APPLICATION f.ORM D Development in 100-Year Floodplain D Development in 100-Year Floodplain Varia nce D Code Text Amendment □Rezoni n g O zone District O PUD O PUD Amendment U dml nistrative Interpretation □Appeal of Administrative Interpretati on □Areas and Activities of State Interest □Accommodation Pursuant to Fair Housing Act O variance Dime Extension (also check type of original application) INVOLVED PARTIES Owner/ Applicant Name: Phone: ( ) Mailing Address : City: State : Zip Code : E-mail: Representative (Authorization Required) Name: Phone: ( ) Mailing Address: City: State : Zip Code : E-mail: PROJECT NAME AND LOCATION Project Name: Assessor's Parcel Number: --------------- Physical/Street Address: Legal Description: Zone Dis trict: Property Size (acres): PROJECT DESCRIPTION Existing Use: Proposed Use (From Use Table 3-403): -====================== Description of Project: ____________________________ _ For Appeal of Administrative Interpretation please include: 1. The Decision you are appealing. 2. The date the Decision was sent as specified in the notice (date mailed). 3. The nature of the decision and the specified ground for appeal . Please cite specific code sections and/or relevant documentation to support your request . 4. The appropriate appeal fee of $250.00. 5. Please note a completed Appeal Application and fees must be received within 30 calendar days of the date of the final written Administrative lnteroretation. REQUEST FOR WAIVERS Submission Requirements □ The Applicant requesti ng a Waiver of Submission Requ i rements per Section 4-202. List : Section : Section : Section : Section: Waiver of Standards □ The Applicant is requesting a Waiver of Standards per Section 4-118. List : Sect ion : Section: Section : Section : I have read the statements above and have provided the required attached information which is e to the best of my knowledge. Property Owner or Authorized Representative, Title Date OFFICIAL USE ONLY File Number: ____ -___ _ Fee Paid:$ ____________ _ July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com RED HOUSE architecture design + build Memorandum To: Phillip Berry/Garfield County Planning Department From: Bruce Barth Re: 280 Lariat Lane/McCarty Residence Subject: Secondary Dwelling Unit The following are the response and submittal requirements outlined in the pre-application summary dated July 16th, 2021. 1. Project Narrative: The applicant seeks to build single family home on a lot (5.762 acres) with a pre-existing dwelling unit that exceeds 1000 sf and is therefore deemed a secondary dwelling unit. The 2028 sf dwelling unit was constructed by a previous owner and is allowed under the Teller Springs subdivision. Each unit will have its own OSWT system (see descriptive letter from Mountain Cross Engineering) and each unit will have a tap on the community water system (see will serve letter from the HOA). 2. Proof of Ownership: see attached document 3. Neighboring Properties within 200’-0: • Charles and Lee Plimpton/PO Box 61, Carbondale, CO 81623 • Steve and Laura Carter/221 Lariat Lane, Glenwood Springs CO 81601 • Estate of Walter M Gleason/2273 River Road, Grand Junction CO 81505 • Charles and Lee Plimpton/188 Lariat Lane, Glenwood Springs CO 81601 • Homeowners Association of Aspen Glen/0080 Bald Eagle Way, Carbondale, CO 81623 • Teller Springs Homeowners Association/720 East Durant Avenue, Aspen, CO 81611-2071 • Kerri Kay Pirzadeh/110 Spur Drive, Glenwood Springs, CO 81601 • Aspen Glen Water and Sanitation District/9929 Highway 82, Carbondale, CO 81623 • Christopher Butler and Stacey Campos/3367 Grand Avenue, Glenwood Springs, CO 81601 4. Site Plan: See attached document July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com 5. Grading and Drainage Plan: The applicant requests a waiver from this requirement based on the fact that the unit in question exists and likewise so has the grading and drainage for a number of years predating the current owner. A grading and drainage plan specific to the proposed construction (single family home) has been provided as part of the permit submittal. The project size and use are compatible with the existing land uses/neighboring properties and the complexity and impacts are extremely minimal. Secondly, the waiver does not compromise a proper and complete review and information is not material in demonstrating compliance with approval criteria. 6. Landscape Plan: The applicant requests a waiver from this requirement based on the fact that the unit in question exists and likewise so has the landscaping (see attached photos) for a number of years predating the current owner. The project size and use are compatible with the existing land uses/neighboring properties and the complexity and impacts are extremely minimal. Secondly, the waiver does not compromise a proper and complete review and information is not material in demonstrating compliance with approval criteria. 7. Impact Analysis: The applicant requests a waiver from this requirement based on the fact that the unit in question exists and has minimal to no additional impacts on the surrounding neighboring properties. The project size and use are compatible with the existing land uses/neighboring properties and the complexity and impacts are extremely minimal. Secondly, the waiver does not compromise a proper and complete review and information is not material in demonstrating compliance with approval criteria. 8. Development Agreement: not applicable 9. Improvement Agreement: not applicable 10. Traffic Study: The applicant requests a waiver from this requirement based on the application does not create a large amounts of additional of traffic – 5-6 trip per day, all residential in nature with no commercial activity added to County roads no additional impacts on the surrounding neighboring properties. The project size and use are compatible with the existing land uses/neighboring properties and the complexity and impacts are extremely minimal. Secondly, the waiver does not compromise a proper and complete review and information is not material in demonstrating compliance with approval criteria. 11. Water Will Serve Letter: See attached document from Teller Springs HOA 12. Wastewater Management Treatment Plan: See attached document from Mountain Cross Engineering July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com 13. Article 7 Standards: The project complies with Article 7 standards of the Garfield County Land Use code. The nature, scale and intensity of the secondary unit is compatible with all of the surrounding uses as it is residential in nature and is a use found in the surrounding properties of the Teller Springs subdivision. There are adequate public and private utilities for all aspects of the secondary unit (water, OWTS, electric, gas, etc.). There are existing, safe and adequate subdivision streets and an existing driveway to access the unit. The unit itself does not create a large amount of traffic – 5-6 trip per day, all residential in nature with no commercial activity added to County roads. There are no natural and geologic hazards to the subject property that require mitigation. There is no Land Use change so all resource protection standards from Section 7-210 are not applicable to this application. All existing wildlife protections remain in place and unchanged by this application. All setbacks to waterbodies remain intact and unchanged by this application. All existing drainage and storm water runoff will remain unchanged by this application. The exiting unit is accompanied by an existing Garage sized to house a minimum of 3 vehicles. The existing landscaping surrounding the secondary unit includes 6 Cottonwoods, 2 ornamental trees and an Evergreen to the west of the unit, 8 Cottonwoods and 8 Evergreen trees to the east and 4 Aspens to the north (see attached photos). There is ample snow storage in all areas surrounding the subject unit (see site plan). The floor area of the secondary dwelling unit does not exceed the maximum of 3000 sf from Section 7-701 B and the 5.762 acre lot meets the 2 acre minimum standard for lot size. There will be no commercial, industrial or multi-family uses associated with the proposed secondary unit. Please let us know if you need any further information. End of Memorandum BB/dab 0942 M1 cc: file July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 970 947 9137 www.redhousearchitecture.com RED HOUSE architecture design + build Garfield County Community Development 108 8th Street, Suite 401 Glenwood Springs, CO 81601 Re: McCarty Residence/Secondary Unit 280 Lariat Lane Glenwood Springs, CO 81601 Subject: Authorization To whom it may concern: This letter serves as authorization for Bruce Barth of Red House Architecture to act a representative of the owner for the above-mentioned project applications and all associated work. Please accept this as consent to process the application and feel free to contact me with any questions. Best Regards, Kenny McCarty Emily McCarty 0942 L1 July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com 1 Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 (970) 945-8212 www.garfield-county.com PRE-APPLICATION CONFERENCE SUMMARY TAX PARCEL NUMBER: 239513101020 DATE: 7/16/2021 PROJECT: McCarty Secondary Dwelling – Teller Subdivision OWNERS: Emily and William McCarty CONTACT/REPRESENTATIVE: Bruce Barth – Red House Architecture PRACTICAL LOCATION: 280 Lariat Ln, Glenwood Springs, Co 81601 TYPE OF APPLICATION: Administrative Review for a Secondary Dwelling Unit ZONING: Rural (Teller Subdivision, no PUD) COMPREHENSIVE PLAN: Residential Medium High I. GENERAL PROJECT DESCRIPTION The 5.762 acre lot currently has a barn/residential structure approximately 2,000 square feet. The applicates wish to build a new residential structure over 5,000 square feet. The application seeks to consider the existing structure a secondary dwelling unit so that the proposed structure can be constructed as the primary dwelling unit. The lot is served by community water but has private septic. A new OWTS will serve the proposed house. The applicant stated the HOA is not opposed to the application. II. COMPREHENSIVE PLAN The application complies with the comprehensive plan’s future land use designations of medium high in this area. III. REGULATORY PROVISIONS APPLICANT IS REQUIRED TO ADDRESS The following Sections of the Garfield Land Use and Development Code as amended apply to the Application: ➢ Section 4-103 Administrative Review and Section 4-101 Common Review Procedures July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com 2 ➢ Table 4-201 Submission Requirements and Section 4-203 Description of Submittal Requirements. ➢ Section 4-118 and Section 4-202, as applicable. ➢ Article 7, as applicable. ➢ 7-701.B Secondary Dwelling Unit Standards IV. SUBMITTAL REQUIREMENTS As a convenience outlined below is a list of information typically required for this type of application. Table 4-201 outlines the specific application submittal criteria. The following list can function as a checklist for your submittal. General Application Materials including the Application Form (signed), payment of Fees and signed Payment Agreement Form (see attached). o A narrative describing the request and related information. o Proof of ownership o Names and mailing addresses of property owners within 200 ft. of the subject property from Assessor’s Office Records. o Mineral rights ownership for the subject property including mailing address and/or statement on mineral rights research (see attached). o If an owner intends to have a representative complete the Application and processing, then an authorization letter is needed. o Copy of the Preapplication Summary needs to be submitted with the Application. o Vicinity Map Site Plan Grading and Drainage Plan. A waiver from the plan may be requested. Landscape Plan Impact Analysis Development agreement, if applicable Improvement agreement, if applicable Traffic Study. A waiver from the study may be requested. Water Supply/Distribution Plan, or a will-serve letter for the requested taps. Wastewater Management/Treatment Plan, may be a copy of current OWTS permit The Application should demonstrate compliance with applicable Article 7 Standards o Any waivers from Article 7 Standards should be included (4-118 Waiver of Standards) Submittal waivers should be included in accordance with 4-202 Waiver of Submission Standards Three hard copies and one digital copy (on a USB drive) of the application are required. Both versions should be split into individual sections. Community Development Staff is available to meet with the Applicant to provide additional information and clarification on any of the submittal requirements and waiver requests. July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com 3 V. REVIEW PROCESS Call-Up for review by the Board in accordance with the procedures and review process contained in Section 4-112. Staff will review the application for completeness, and when complete, refer it to appropriate agencies for technical review. Staff will create a report to be submitted to the Director for their decision. Public Hearing(s): X No Public Hearing, Directors Decision (with notice per code) Planning Commission Board of County Commissioners Board of Adjustment July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com 4 Referral Agencies: May include but is not limited to: Garfield County Surveyor, Garfield County Attorney, Garfield County Building Department, Garfield County Road and Bridge, Garfield County Consulting Engineer, Homeowners Association, Fire District . VI. APPLICATION REVIEW FEES Planning Review Fees: $250 Referral Agency Fees: $na Total Deposit: $250 (additional hours are billed at hourly rate of $40.50) VII. GENERAL APPLICATION PROCESSING The foregoing summary is advisory in nature only and is not binding on the County. The summary is based on current zoning, which is subject to change in the future, and upon factual representations that may or may not be acc urate. This summary does not create a legal or vested right. The summary is valid for a six-month period, after which an update should be requested. The Applicant is advised that the Application submittal once accepted by the County becomes public information and will be available (including electronically) for review by the public. Proprietary information can be redacted from documents prior to submittal. Pre-application Summary Prepared by: 7/19/2021 Philip Berry, Planner III Date July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com 5 July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com 6 July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com 7 July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com EEG IVB IVB IVB IVB IVB IVB IVB IVB IVBIVBIVBIVBIVB IVB IVB IRR IRR IRR GN3 2 ° 0 0 ' 0 0 "W 7 3 6 . 6 0 'ARC=126.53'RAD=125.00'N18°00'00 "W 155 .58 'ARC=58.45'RAD=50.00'S79°00'00" E 149.98'S01°43'30"W 67.36'S88°00'00"E 190.00'S01°43'30"W 1113.86'52.0 '52.0'48.0'48.0'LOFTINGSHED(EX IST ING )LOFTINGSHED(EX IST ING ) GRAVEL DRIVE WAY (EXISTING)N40°00'00"E42.78'N19°00'00"E51.55'S72°00'00"E25.77'W METALCORRAL(TO BEREMOVED)GRASSPASTURERIDING ARENAW 30' WIDE ELECTRIC, TELEPHONE & WATERLINE EASEMENT15' PEDESTRIAN & EQUESTRIAN EASEMENTHORSE WALKING MACHINE(EXISTING)SHED(EX IST ING )LOFTINGSHED(EX IST ING )GRAVELPARKING(EXISTING)WELL & WATERLINEEASEMENT30' X 60'30' ACCESS, TELEPHONE & WATERLINE EASEMENT1 0 ' SETBACK10' SETBACK25' SETBACK F ENC ED AREA 50' WIDE ACCESS, TELEPHONE & WATERLINE EASEMENT30' WIDE ACCESS, TELEPHONE & WATERLINE EASEMENTOVERHANGTWO-STORYFRAME BLDG.(EXISTING)PONDDOCKIRRIGATIONPUMP HOUSE(EXISTING)12"CMPOSW LOT 19LOT 15OPEN SPACELOT 20GRAVEL DRIVEM c C a r t y R e s i d e n c e 2 8 0 L A R I A T L A N E G L E N W O O D S P R I N G S , C O L O R A D O0942 A1.1COPYRIGHT RED HOUSE ARCHITECTURE date: remarks: 815 BLAKE AVE.GLENWOOD SPRINGS,CO. 81601PHONE (970) 945-8240FAX (866) 431-1950bruce@redhousearchitecture.comdesign + buildDate: 7/6/21 Time: 6:14:27 PM File name: 0942 A1.1.vwx SITE PLANA1 .1SITE PLAN@ 1"= 30'-0"BUILDING 100'-0"=SITE 6005.8NOTE: EXISTING SEPTIC SYSTEMSHALL BE VERIFIED IN FIELDPERMIT SET 4/30/21 S19°41'ES18°01'EEast Sop r is PeakWest Sopr is Peak12'-0"PROPOSEDDRIVEWAYTWO-STORYFRAME BLDG.(PROPOSED)PROPOSED SINGLE FAMILY HOUSEEXISTING SECONDARY UNIT AND BARN July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com ________________________________________________________________________________________________________ 826 ½ Grand Avenue, Glenwood Springs, CO 81601 P: 970.945.5544 F: 970.945.5558 www.mountaincross-eng.com June 11, 2021 Mr. Bruce Barth Red House Architecture 815 Blake Avenue Glenwood Springs, CO 81601 RE: McCarty Residence, 280 Lariat Lane, Garfield County, CO – OWTS Report Dear Bruce: The purpose of this correspondence is to inform you about the onsite wastewater treatment system (OWTS) designed for the construction of the McCarty Residence. The project proposes to construct a new residence. An existing residence exists on the site with its own OWTS. No modification is proposed to that residence or system. The project is located in Garfield County at 280 Lariat Lane. The main and upper floors of the residence will be a gravity system to a conventional septic tank where a pump will pressure dose to a leach field comprised of a sand filter. The plumbing of the lower level will need a sewer ejector pump to lift into the gravity system. The residence will be served by an existing well. The OWTS is not within a 100-year flood plain boundary. There are practical constraints that you should be aware of when considering the proper design, construction, and operation. Subsurface The soil was determined to be R0 soils with an LTAR value approximated as 0.80 gallons per day per square foot (GPD/sq.ft.) based on using secondary sand media and a soil evaluation performed by Kumar and Associates. A profile hole was excavated and an inspection revealed that no bedrock or high groundwater table is within an 8’ depth of the leaching area. A copy of the soils report is attached. Design Calculations The residence is proposed to be 5 bedrooms. Using Garfield County Table 6-1 for a 5-bedroom residence, this yields 600 gallons per day (GPD) total. The design calculations for sizing of the septic system and the leach field follow: • McCarty Residence: 5 bedrooms = 600 GPD • Based on soil evaluation and sand media, LTAR = 0.80 GPD/sq.ft. • Minimum absorption area = 600 GPD / 0.80 = 750 sq. ft. • No reductions are allowed for rocky soils. • Required septic tank volume = 1,500 gallons per Garfield County Table 9-1 • Dosing frequency = 4 doses per day; dose volume = 600 GPD / 4 doses = 150 gal./dose • Pump(s) should provide 30 gpm at 35’ of Total Dynamic Head • PVC lateral supply should be Schedule 40, 1-1/2” in diameter. • PVC lateral distribution pipes should be Schedule 40, 1” in diameter. • Each lateral pipe should have ten ¼” diameter holes drilled in the lateral at 6’ spacing with the first hole located at 51” from the start of the bed. July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com McCarty Residence June, 2021 Page 2 of 3 Mountain Cross Engineering, Inc. Civil and Environmental Consulting and Design 826 ½ Grand Avenue, Glenwood Springs, CO 81601 P: 970.945.5544 F: 970.945.5558 www.mountaincross-eng.com The component manufacturers are typical for the area. Alternatives may be considered by contacting this office. Construction must be in accordance with the specifications of Garfield County Environmental Health, the OWTS permit, and this design. Topsoil should be placed over the OWTS and planted with native grasses. No large vegetation and/or plants with taproots should be planted over the absorption area nor grasses that require excessive irrigation. Calculations are attached. Setbacks The location for the septic and dosing tanks are limited by setback requirements per Garfield County and the State of Colorado. These include: • 50’ FROM WELL • 50’ FROM WATER BODY • 10’ FROM WATER SUPPLY LINE • 10’ FROM PROPERTY LINE • 10’ FROM LINED POND, DITCH, OR STREAM • 10’ FROM CREST OF BANK • 5’ FROM BUILDING WITH BASEMENT • 5’ FROM LEACH FIELD The leach field setback requirements are: • 100’ FROM WELL • 50’ FROM WATER BODY • 25’ FROM WATER SUPPLY LINE • 25’ FROM CREST OF BANK • 20’ FROM BUILDING WITH BASEMENT • 10’ FROM PROPERTY LINE • 10’ FROM LINED POND, DITCH, OR STREAM • 5’ FROM SEPTIC TANK The setback requirements deal primarily with buildings and potential contamination from the septic tank, dosing tank, and leach field to either culinary water or surface water. These setbacks have been included on the plans for reference. There is an existing waterline that will need to be crossed. The pressurized sewer line will need to be encased for 25’ each side of the crossing. Contractor will need to pothole the water line to determine its location so that the encasement can be centered on the water line. Operation Information and Maintenance The Owner will need to be responsible for the operation and management of the OWTS. Geo- fabrics or plastics should not be used over the absorption area. No heavy equipment, parking of machinery, or materials should be placed on the absorption area. Livestock should not graze on July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com McCarty Residence June, 2021 Page 3 of 3 Mountain Cross Engineering, Inc. Civil and Environmental Consulting and Design 826 ½ Grand Avenue, Glenwood Springs, CO 81601 P: 970.945.5544 F: 970.945.5558 www.mountaincross-eng.com the absorption area. Plumbing fixtures should be checked to ensure that no additional water is being discharged to OWTS; for example, running toilets or leaky faucets can discharge hundreds of gallons of water a day and harm the absorption area. Garbage disposal use should be minimized, and non-biodegradable materials should not be placed into the OWTS. Grease should not be placed in drains and grease traps should be installed upstream of the septic tank but downstream from any kitchen. Loading from a water softener should not be discharged into the OWTS. No hazardous wastes should be directed into the OWTS. The OWTS is engineered for domestic waste only. The Owner will likely need to contract with a septic system cleaner to clean the septic tank every two years, or as needed gauged by measurement of solids in the tank. The standards of performance for the septic system cleaner are recommended to be the following, at a minimum: 1. The Systems Cleaner shall be licensed. 2. The Systems Cleaner, when cleaning a septic tank, shall remove the liquid, sludge, and scum, leaving no more than three (3) inches depth of sewage in a septic tank. 3. The Systems Cleaner shall maintain his equipment so as to ensure that no spillage of sewage will occur during transportation, and that its employees are not subject to undue health hazards. 4. The Systems Cleaner shall dispose of the collected sewage only at a designated site recognized by the Board of Health. Construction Observation Prior to being backfilled, the construction of the OWTS and all of the components will need to be observed by representatives of Mountain Cross Engineering, Inc. The conclusions and opinions that are expressed above are based on the information available at the time of preparation of this report. Any additional information presented afterward may require that these opinions and the design be modified. Thank you for the opportunity to provide this report. Feel free to call if you have any questions, concerns, or comments. Sincerely, Mountain Cross Engineering, Inc. Chris Hale, PE July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com DOSING DESIGN CALCULATIONS, for 280 Lariat Lane, Garfield County, CO 6/11/2021 Step 1: Flows 5 Bedrooms gallons: average day 600 gallons per day Table 6-1 4 doses per day 150 gallons per dose Step 2: BOD5 75 gpd/person 8 persons 600 gpd used by residence BOD5 for domestic uses: 0.2 lb/person/day from CDPHE Step 3: Dosing Basin 4 foot diameter manhole 94.0 gallons per foot of depth depth of dose volume =1.60 feet of depth in manhole Invert in from septic tank -3.35 Sump = bottom of manhole -7.92 Pump "Off"1 -6.92 Pump On "Lead" Float 2.60 -5.32 Pump On "Lag" Float 3.10 -4.82 High Level Alarm 3.60 -4.32 12" from High Level to Inv In 4.60 -3.32 minutes of run time per dose = 5.0 30 gpm Step 4: Elevations, Orifices, and Head loss Rim Elevation =-0.5 High Point Elevation =-1.5 Invert In at Manhole = -3.35 Sump =-7.92 Elev Diff =7.4 feet Length of 1-1/2" =100 feet to Leach field Length of 1" =260 feet in Leach field 1-1/2" fittings in equivalent pipe length: check 90 90 check 90 gate tee tee tee 13.4 4 4 13.4 4 1.1 8.1 8.1 8.1 64.2 feet Equivalent 1-1/2" Length from pump =171.6 feet July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com from Fig F, using 8.27 ft of friction head per 100' of 1-1/2" plastic pipe = 14.2 head loss @ 30 gpm from Fig F, using 3.3 ft of friction head per 100' of 1" plastic pipe = 8.6 head loss @ 7.5 gpm Plus operating head at end 5.0 feet Dynamic Head (TDH)35.2 system condition use TDH of 35 feet Per Table 7-13 in OWTS Design Manual, 1/4 " dia. orifice @ 1' of Head yields 0.75 gpm 4 Laterals 10.0 orifices per lateral 30 gpm Step 5: Velocity verification 30 gpm in 1.5 inch pipe 0.012 = area 0.067 = flow in cfs 5.447 = velocity in feet per second, must be greater than 2.0 feet per second but less than 10 feet per second 7.5 gpm in 1 inch pipe 0.005 = area 0.017 = flow in cfs 3.064 = velocity in feet per second Step 6: Pipe Volume & Drain Back assume only drainback from manifold 1.5 inch pipe 0.012 = cross sectional area 107.4 = feet in length 1.318 = cubic feet 9.86 = gallons 1.26 = inches of drainback into dosing tank July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com West side of existing unit Northeast side of existing unit July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com Northwest side of existing unit North side of existing unit July 21, 2021 815 blake avenue glenwood springs colorado 816101 p 970 945 8240 f 866 431 1950 www.redhousearchitecture.com Northeast side of existing unit