Loading...
HomeMy WebLinkAbout14239 Hwy 6 - 211102200017Environmental Health Department P.O. Box 179 500 Broadway Eagle, CO 81631-0179 Phone: (970) 328-8730 Fax: (970) 328-7185 Permit Permit No. OWTS-020570-2021 Permit Type: OWTS Permit Work Classification: New Permit Status: Active Issue Date: 2/10/2021 Expires: 6/10/2021 On-Site Wastewater Treatement System Project Address Parcel Number 14239 HWY 6, Eagle Area,211102200017 Owner Information Address Susan Ballard PO Box 4359 Avon, CO 81620 Phone: Cell: Email: suziriley@me.com Inspections: For Inspections Call: (970) 328-8755 and call the Design Engineer Engineer Phone Email KUMAR & ASSOCIATES, Dave Young (970) 945-7988 dyoung@kumarusa.com Contractor License Number Phone Email Daly Excavation bamford_joe@yahoo.com(970) 987-7284OWTSPL-000107-20 20 Permitted Construction / Details: Install the new system exactly as depicted in the Kumar & Associates design, stamped and signed on December 2nd, 2020, and dated November 30th, 2020. The new system will be sized to accommodate the maximum daily flows for a 2 bedroom residence and a 1 bedroom cabin. This system was sized for the addition of future bedrooms in the basement to a total of 5 bedrooms. This OWTS consists of 2 sewer lines, one from the cabin and one from the residence. A Valley Precast 1,500 gallon, two-chamber septic tank with an effluent filter in the outlet tee. A Tuf-Tite 4-Hole Distribution Box equipped with speed levelers will be accessible at grade. The STA consists of 3 shallow trenches of 22 Infiltrator Quick 4 Plus Standard chambers for a total of 66. Schedule 40 PVC shall be used beneath all driveway surfaces. Be sure to flag and maintain setback distance from the irrigation ditch prior to starting excavation. 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. 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 Sell Date February 10, 2021 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 PERMIT 4.1.6(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, February 10, 2021 1 *************************************************************************** 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: ____800____ Receipt #: ___________ Check #: __1001_____ 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 Susan Ballard 805-551-1503 PO Box 4359 Avon Co, 81620 suziriley@me.com Kumar & associates 970-945-7988 Derrick Gerhardt 970-390-8294 Daly Excavation 125 Rio Grande LN Carbondale Co 59-2020 970-963-3987 bamford_joe@yahoo.com 4 2111-022-00-017 35 Acres 14239 Highway 6 Lot 4 Eagle Ranch (see attached doc will all info) 4 4 2 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-518251-2022 Permit Number: OWTS-020570-2021 Inspection Date: 10/12/2022 Inspector: Permit Type: OWTS Permit Inspection Type: OWTS Final Inspection Work Classification: NewOwner:Susan Ballard Job Address:14239 HWY 6 IVR Pin Number:192218 Eagle Area, CO Project:<NONE> Parcel Number:211102200017 Contractor:Phone: (970) 926-2770 / Cell: (970) 390-3708Ewing Trucking & Construction LLC Inspection Status: Approved Inspection Notes Inspector Comments Added Item: Septic Tank A Valley Precast 1,500 gallon, two-chamber septic tank was used. Added Item: Record Drawing Received 10/11/2022 from K&A. Added Item: Record Photos Received 10/11/2022 from K&A. Added Item: Site and Soil Received 2/10/2021 from K&A. Added Item: Final Certification Letter Received 10/11/2022 from K&A. Added Item: General Plan Received 2/10/2021 from K&A. Added Item: Soil Treatment Area (STA) The STA consists of 3 shallow trenches of 22 Infiltrator Quick 4 Plus Standard chambers for a total of 66. The cabin was not relocated and therefore an existing sewer line was used. Added Item: Identification of Systems Contractor Ewing Trucking & Construction was the licensed installer. Wednesday, October 12, 2022 For more information visit: http://www.eaglecounty.us Page 1 of 2 Wednesday, October 12, 2022 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 October 5, 2022 Resort Concepts Attn: Derrick Gerhardt P. O. Box 5127 Edwards, Colorado 81632 (dgerhardt@resortconceptsco.com) Project No. 20-7-337.02 Permit No. OWTS-020570-2021 Subject: Certification of Onsite Wastewater Treatment System, Proposed Ballard Residence and Cabin, Lot 4, Eagle Ranch Estates, 14239 U.S. Highway 6, Eagle County, Colorado Dear Derrick: 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 Resort Concepts dated June 11, 2020. We previously designed the OWTS for the residence and cabin as submitted in our report dated November 30, 2020, Project No. 20-7-337.02. The system was designed for four bedrooms in the residence and one bedroom in the cabin. The system was installed by Ewing Trucking & Construction under Permit No. OWTS-020570-2021. We performed our as-built evaluation on April 8 and May 17, 2022. The OWTS components observed included: cleanout, septic tank, effluent line, distribution box 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 visit are included with this report. The distance locations to the septic tank shown on Figure 1 were made by taping from the residence. The distance to the ditch from the STA was measured at 56 feet. The cabin was not relocated as planned. We understand a sewerline connects from the cabin to the residence. Installation of the sewer line from the cabin to the residence was not observed by us. We did observe a cleanout for the sewerline as noted in our attached pictures. 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 EAGLE RIVER RANCH ROADBALLARD RESIDENCELOT 4, EAGLE RANCH ESTATES14239 EAGLE RIVER RANCH ROADX XXX XXXXXXXXOEOEOEOEOEOEOEOEOEOEOEOEOEOEOEOE OE OE OE OE OE OE OE OEWSWSWSWSWSWSWSWSWSWSWSWSEEEEEEEEED11786443.80GPS117811936443.81117820766443.97BS21146443.97207656'17'31'Kumar & Associates OWTS PHOTOGRAPH LOG PROPOSED BALLARD RESIDENCE AND CABIN LOT 4, EAGLE RANCH ESTATES 14239 U.S. HIGHWAY 6 EAGLE COUNTY, COLORADO Project No. 20-7-337.02 Photograph 1: Cleanout at sewer line exiting residence. Photograph 2: Valley Precast 1,500 gallon, two-chamber septic tank. OWTS PHOTOGRAPH LOG PROPOSED BALLARD RESIDENCE AND CABIN LOT 4, EAGLE RANCH ESTATES 14239 U.S. HIGHWAY 6 EAGLE COUNTY, COLORADO Project No. 20-7-337.02 Photograph 3: Effluent filter at outlet of septic tank. Photograph 4: Effluent line to soil treatment area (STA). Partially backfilled. OWTS PHOTOGRAPH LOG PROPOSED BALLARD RESIDENCE AND CABIN LOT 4, EAGLE RANCH ESTATES 14239 U.S. HIGHWAY 6 EAGLE COUNTY, COLORADO Project No. 20-7-337.02 Photograph 5: TufTite 7-hole distribution box and STA. Photograph 6: Soil treatment area (STA) with observation ports installed at ends of trenches. OWTS PHOTOGRAPH LOG PROPOSED BALLARD RESIDENCE AND CABIN LOT 4, EAGLE RANCH ESTATES 14239 U.S. HIGHWAY 6 EAGLE COUNTY, COLORADO Project No. 20-7-337.02 Photograph 7: Cleanout for sewer line exiting cabin. 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 BALLARD RESIDENCE AND CABIN LOT 4, EAGLE RANCH ESTATES 14239 U.S. HIGHWAY 6 AKA 14239 EAGLE RIVER RANCH ROAD EAGLE COUNTY, COLORADO PROJECT NO. 20-7-337.02 NOVEMBER 30, 2020 PREPARED FOR: RESORT CONCEPTS ATTN: JEFF TOWNSEND P. O. BOX 5127 EDWARDS, COLORADO 81632 (jtownsend@resortconceptsco.com) Kumar & Associates, Inc. ® Project No. 20-7-337.02 TABLE OF CONTENTS INTRODUCTION ...................................................................................................................... - 1 - PROPOSED CONSTRUCTION ................................................................................................ - 1 - SITE CONDITIONS ................................................................................................................... - 1 - SUBSURFACE CONDITIONS ................................................................................................. - 2 - OWTS ANALYSIS .................................................................................................................... - 3 - DESIGN RECOMMENDATIONS ............................................................................................ - 3 - SOIL TREATMENT AREA................................................................................................... - 4 - OWTS COMPONENTS ......................................................................................................... - 5 - OWTS OPERATION AND MAINTENANCE.......................................................................... - 7 - OWTS HOUSEHOLD OPERATION .................................................................................... - 8 - OWTS MAINTENANCE ....................................................................................................... - 8 - OWTS CONSTRUCTION OBSERVATION ............................................................................ - 9 - LIMITATIONS ........................................................................................................................... - 9 - FIGURES FIGURE 1A – VICINITY MAP FIGURE 1B – OWTS SITE PLAN FIGURE 2 – USDA GRADATION TEST RESULTS FIGURE 3 – SOIL TREATMENT AREA CALCULATIONS FIGURE 4 – SOIL TREATMENT AREA PLAN VIEW FIGURE 5 – SOIL TREATMENT ARE CROSS SECTION ATTACHMENTS VALLEY PRECAST 1,500 GALLON, TWO-CHAMBER SEPTIC TANK DETAIL TUF-TITE 4-HOLE DISTRIBUTION BOX DETAIL Kumar & Associates, Inc. ® Project No. 20-7-337.02 INTRODUCTION This report provides the results of an onsite wastewater treatment system (OWTS) design for the proposed Ballard residence and cabin to be located on Lot 4, Eagle River Ranch, 14239 Hwy 6 (aka 14239 Eagle River Ranch Road), Eagle County, Colorado. The purpose of the report was to provide design details for the OWTS in accordance with the 2018 Eagle County Environmental Health Department Onsite Wastewater Treatment System Regulations and the Colorado Department of Public Health and Environmental Regulation #43. The services are supplemental to our agreement for professional services to Resort Concepts dated June 11, 2020. We previously conducted a subsoil study for foundation design of the proposed residence at the site and presented our findings in a report dated November 10, 2020, Project No. 20-7-337. PROPOSED CONSTRUCTION The residence will be a one- to two-story structure over an unfinished basement level with an attached garage located near the middle portion of the lot as shown on Figures 1A and 1B. The basement and garage floors will be slab-on-grade. The residence will initially have two bedrooms. The existing cabin will be moved approximately 200 feet to the northeast of its current location, see Figure 1B. The cabin has one bedroom. The soil treatment area (STA) will be sized for 5 bedrooms for the possible future additions of bedrooms (in the basement area) to the residence. The STA for the OWTS will be located to the west of the proposed residence as shown on Figure 1B. Water service will be provided by an onsite well located to the east of the proposed residence. The planned route of the water line from the well to the residence is shown on Figure 1B. If proposed construction is different than that described, we should be contacted to re-evaluate our design recommendations. SITE CONDITIONS The site has been developed with several existing structures and an older cabin located on the site as shown on Figure 1B. The ground surface has been graded some, apparently as part of the existing development. The terrain is gently sloping down to the south towards the Eagle River at grades from about 3 to 5%. The Eagle River borders the south side the site and is about 15 feet lower in elevation. Vegetation consists of sparse grass, sagebrush and weeds. There is an irrigation ditch south of the proposed residence and approximately 55 feet south of the proposed STA, see Figure 1B. - 2 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 There is an apparent sinkhole located to the east the proposed residence approximately as shown on Figure 1B. The sinkhole is about 10 feet in diameter and 4 feet deep, and has been partially backfilled including with some debris. We are not aware of any other surface depressions on the site; however, the previous grading may have covered other surface depressions. SUBSURFACE CONDITIONS The field exploration for the OWTS was conducted on August 7, 2020. Three profile pits (Profile Pits 1, 2 and 3) were excavated with a backhoe at the approximate locations shown on Figure 1 to evaluate the subsurface conditions at proposed STA for the OWTS. The pits were logged by a representative of Kumar & Associates. Logs of the profile pits are provided below. Log of Profile Pit 1 Depth USDA Classification 0’-3” TOPSOIL; organic sandy loam, loose, slightly moist, dark brown. 3”-8’ SANDY LOAM; moderately blocky structure, loose, slightly moist to moist, brown. • Disturbed bulk sample obtained from 4 to 5 feet. • Bottom of pit @ 8 feet. • No free water or redoximorphic features observed at time of pit excavation. Log of Profile Pit 2 Depth USDA Classification 0’-1” TOPSOIL; organic sandy loam, loose, slightly moist, dark brown. 1”-8’ SANDY LOAM; moderate blocky structure, loose, slightly moist to moist, brown. • Bottom of pit @ 8 feet. • No free water or redoximorphic features observed at time of pit excavation. Log of Profile Pit 3 Depth USDA Classification 0’-3” TOPSOIL; organic sandy loam, loose, slightly moist, dark brown. 3”-8’ SANDY LOAM; moderately blocky structure, loose, slightly moist to moist, brown. • Disturbed bulk sample obtained from 3 to 4 feet. • Bottom of pit @ 8 feet. • No free water or redoximorphic features observed at time of pit excavation. The soils encountered in profile pits below about 1 to 3 inches of topsoil consisted of Sandy Loam to the depths explored of 8 feet. Hydrometer and gradation analyses were performed on a disturbed bulk sample of the soils from Profile Pit 1 from 3 to 4 feet depth with the results - 3 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 provided on Figure 2. The tested sample (minus No. 10 size sieve fraction) classifies as Sandy Loam per the USDA system. Based on the profile pit tactile evaluations and laboratory testing, the soils have been classified as Soil Type 2 per State regulations. No free water was encountered in the pits nor indications of seasonal high groundwater observed at the time of the pit excavations. The soils at the STA have been classified as Type 2 per State regulations, which equates to a long-term acceptance rate (LTAR) of 0.60 gallons per square foot per day. OWTS ANALYSIS Based on the site conditions and profile pit evaluations, the evaluated area should be suitable for a conventional infiltration soil treatment system consisting of chambers in a trench configuration. The STA will be located west of the residence. The base of the soil treatment trenches will be in Sandy Loam soils (Soil Type 2) for which we will use an LTAR of 0.60 gallons per square foot per day to size the STA. The system will be designed for five bedrooms and an average daily flow of 75 gallons per person with double occupancy in the first three bedrooms in the residence and single occupancy in the other bedroom and double occupancy in the cabin for a total of 9 persons. At the planned cabin location, there appears to be adequate elevation drop for gravity flow to the septic tank, if this is not the case we should review our design. The sewage will gravity flow from the residence and the cabin to the septic tank for primary treatment and then gravity flow to the STA for dispersal and final treatment. Any basement facilities will need to be pumped to the tank and should be designed by a plumber. The STA will consist of three trenches with Infiltrator chambers. Equal distribution will be provided to the trenches by a distribution box. A 50 feet minimum setback from the STA is required to the irrigation ditch along the south side of the site. The setback is shown on Figure 1. A 50 feet minimum setback is required from the well to the sewer line. A 5 feet minimum setback is required from the water supply line to the sewer line. As designed, the distance from the well to the sewer line from the cabin is at least 70 feet. The septic tank is required to be a minimum of 5 feet from the residence and the STA. 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. A layout of the proposed OWTS components is provided on Figure 1B. If conditions encountered during construction are - 4 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 different than those that are described in this report, please contact us to re-evaluate our design recommendations. SOIL TREATMENT AREA • The STA will consist of three trenches with 22 Infiltrator Quick 4 Plus Standard chambers in each trench placed in the native Sandy Loam soils (66 chambers total). Equal distribution will be provided to the trenches by a distribution box. • The STA was sized based on an LTAR of 0.60 gallons per square feet per day. • Each chamber was allowed 12 square feet of area. A 30% reduction of the STA size was applied for use of Infiltrator chambers in a trench configuration. The total STA is 792 square feet. Soil treatment area calculations are shown on Figure 3. • A minimum of four feet of undisturbed soil between the trenches is required. • A minimum of 12 inches and a maximum of 24 inches of cover soil should be placed over the top of the chambers. • The trenches should be oriented along ground contours to minimize soil cut and cover. • The base and sidewalls of the trench excavations should be scarified prior to the chamber placement. • Backfill should be graded to deflect surface water away from the STA and should be sloped at 3 horizontal to 1 vertical or flatter. • Disturbed soil 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 the knockouts provided in the Infiltrator end caps. Install ports at each end of each trench. The inspection port piping should be screwed into the top to the chambers and should not extend down to the ground surface inside the chambers. The inspection ports should extend at least 8 inches above the finished ground surface or be protected in a valve box at finished grade. • A plan view of the STA is presented on Figure 4 and a cross section of the STA is presented on Figure 5. • The STA must have a minimum setback of 25 feet from any subsurface drain or stormwater structure. • The STA must have a minimum 25 feet setback to any potable water supply line. • The STA must have a minimum 50 feet setback to the irrigation ditch. • The STA must have a minimum 20 feet setback to the residence. - 5 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 • The STA must have a minimum 100 feet setback to any well. • The STA must have a minimum 5 feet setback to the septic tank. 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, two-chamber septic tank will be used for primary treatment. A detail of the tank is provided as an attachment to the report. • An effluent filter should be installed in the tank outlet tee. • The tank must have a minimum 5 feet setback to the residence and from the STA. • The tank must have a minimum of 10 feet setback to any potable water supply lines. • The tank must have a minimum of 50 feet setback to the irrigation ditch or any well. • The tank must have a minimum setback of 10 feet from any subsurface drain or stormwater structure. • 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 may 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 lines 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. Schedule 40 PVC is required beneath all driveway surfaces. • The cabin sewer pipes should be double encased with larger diameter schedule 40 pipe within 10 feet encroachment on either side of drainage near cabin site. • The sewer pipes 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. - 6 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 • A minimum 24 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 and 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. • The sewer pipes 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 in the pipe could cause standing effluent to freeze and damage the 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. • The sewer lines from the cabin and from the residence should be connected with a “Y” connection prior to entering the tank. A “T” connection is not suitable. • The sewer line locations shown on Figure 1B are considered conceptual. We assume that there will be only one sewer line each exiting the residence and the cabin. 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 more than one sewer line exiting the buildings. Effluent Transport Piping • The effluent transport pipe should be 4-inch diameter SDR35 piping sloped at 2% minimum to flow from the septic tank to the distribution box and from the distribution box to each trench. Piping should extend at least 6 inches into the top knockout provided in the Infiltrator end caps and be screwed in place. Splash plates should be installed beneath the inlet piping to help limit scouring of the infiltrative soil surface in the chambers. • 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 to the 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 - 7 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 least 2 inches of rigid foam insulation in these areas. If adequate cover soil is not possible, we should re-evaluate the condition prior to installation. • Schedule 40 PVC pipe is required underneath all 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. • All 90-degree bends should be installed using a 90 degree long-sweep or by using two 45-degree elbows. Distribution Box • The distribution box will be used to equally divide effluent flow between the trenches. We recommend the Tuf-Tite 4-Hole Distribution Box since it is easily accessible from the ground surface for maintenance. A copy of the distribution box detail is provided as an attachment to this report. • The distribution box outlet pipes should be equipped with Tuf-Tite speed levelers for ease of initial setup and adjustment over time. • The distribution box should be a minimum of 18 inches below grade with risers and an access lid at or above grade. • The distribution box must be accessible from ground surface for inspection and maintenance per the State guidelines. • The distribution box must be installed level on a compacted road base subgrade to ensure equal effluent distribution. If settlement of the distribution box occurs, unequal effluent distribution may take place which could cause hydraulic overload of one of the trenches and potential failure. The distribution box should be monitored periodically, and the speed levelers should be adjusted as necessary for levelling. • The ground surface above and around the distribution box should be graded to drain away surface water to prevent standing water near the distribution box which could freeze or cause settlement. 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. - 8 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 OWTS HOUSEHOLD OPERATION • 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 soil absorption system. • Do not irrigate the area on top of or directly upgradient of the soil absorption field as this may cause a hydraulic overload. • Do not dispose of household waste down 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 soil absorption system. • 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 soils absorption system. • 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, distribution box and STA at least annually for problems or signs of failure. • The effluent filter in the septic tank should be cleaned annually by spray washing solids into the first chamber of the septic tank. • The 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 STA, which may shorten its life span. - 9 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 • Pumping of the septic tank should take place when the level of the sludge and scum layers combined take up about 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 inspection). 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 and 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 should provide continued consultation and field services during construction to review and monitor the implementation of our recommendations, and to verify that the recommendations have been appropriately interpreted. Significant design changes may require additional analysis or modifications to our design. It is our opinion that the designed location of the OWTS components does not violate any setback requirements of the current Eagle County Regulations. Below is a table of common minimum horizontal setbacks to OWTS components. Refer to the Eagle County Regulations for a complete list of required setbacks. We recommend the OWTS components be surveyed by a Professional Colorado Land Surveyor. BALLARD RESIDENCE LOT 4 14239 EAGLE RIVER RANCH ROAD EAGLE RIVER HIGHWAY 6 INTERSTATE 70 EAGLE COUNTY AIRPORT COOLEY ME S A R O A D FIGURE 1B Kumar & Associates EAGLE RIVER RANCH ROADBALLARD RESIDENCELOT 4, EAGLE RANCH ESTATES14239 EAGLE RIVER RANCH ROADX XXX XXXXXXXXOEOEOEOEOEOEOEOEOEOEOEOEOEOEOEOE OE OE OE OE OE OE OE OEWSWSWSWSWSWSWSWSWSWSWSWSEEEEEEEEEGD11786443.80GPS117811936443.81117820766443.97BS21146443.972076SSSSSSSSSSSSSSSSSSSSSSSSSSSSSS SSSSKumar & Associates SILT COBBLES COARSE GRAVEL MEDIUMMEDIUMV. FINE SAND CLAY FINE CO.FINEV. CO.CO.FINE Kumar & Associates Kumar & Associates Kumar & Associates Notes: &KDPEeUssKoXOGEeLQstDOOeGOeYeOoQDsFDULILeGJUoXQGsXUIDFe&oQFUetesDQGPD\EeXseGDsDOeYeOLQJFoXUseLI QeFessDU\ &DUesKoXOGEetDNeQE\tKeFoQtUDFtoUtoDYoLGFoPSDFtLoQoItKeQDtLYesoLOsLQtKetUeQFKDUeDs7KeEDseDQGsLGeZDOOsoI tUeQFKe[FDYDtLoQssKoXOGEesFDULILeGSULoUtoFKDPEeULQstDOODtLoQ $OOSLSLQJsKoXOGKDYeDUDtLQJoI6'5oUstUoQJeU &KDQJestotKLsGesLJQsKoXOGQotEePDGeZLtKoXtFoQsXOtDtLoQDQGDSSUoYDOE\.XPDU $ssoFLDtes 5eIeUtotKe(DJOe&oXQt\2QsLte:DsteZDteU6\steP5eJXODtLoQsIoUotKeUDSSOLFDEOesSeFLILFDtLoQs Infiltrator Quick 4 Plus Standard Chamber Installed Level Scarify ground surface prior to chamber placement. Excavate 36" Wide Trench Approx. Existing Gro u n d S u r f a c e 12" min. 24" max. Cover Soil Graded to Deflect Surface Water Native Soil 4' Min. Undisturbed Soil Between Trenches Kumar & Associates Notes 1.Chambers should be installed level on a scarified ground surface. Concrete sand may be used as a leveling course if necessary. 2.Care should be taken by the contractor to avoid compaction of the native soils in the trench areas. The base and side walls of trench excavations should be scarified prior to chamber installation. 3.Changes to this design should not be made without consultation and approval by Kumar & Associates. Tough Problem Providing a simple, reliable, and permanent means for dividing septic tank effluent flow. TUF-TITE Solution A strong, stable, permanent, non-corrosive Tuf-Tite Distribution Box, with a Tuf-Tite Speed Leveler in each outlet. Snap-in pipe seals They’re patented. Simply insert your PVC pipe and push it through the flexible, polyethylene Tuf-Tite seal. Pipes fit watertight. Installation couldn’t be easier. Tuf-Tite® Distribution Box. THE TOUGH ONE! n Injection molded HDPE n Non-corrosive n Simple to install n Easy to level In a septic environment, no other material can match High Density Polyethylene in delivering a lifetime of trouble-free service. Tuf-Tite Distribution Boxes are injection molded, using only premium HDPE which contains no fillers or foam. They’re permanent Unlike cement-based pipe grout, Tuf-Tite seals will not crack or corrode in septic conditions. They stay pliable and watertight permanently. 4-Hole Distribution Box4-Hole Dist Cat Sheet 11/8/01 8:09 AM Page 1 nInjection molded.Exceptionallystrong.nHDPE is non-corrosive in a septic environment. nPatented snap-in pipe seals simplify installation. Interlocking Lid. Heavy-dutyHDPE Lid is ribbed for addedstrength and rigidity. Slottedsides interlock on theDistribution Box to assure atight fit.The 4HD2 Distribution Box comes complete with a Regular Lid or an Inspection Port Lid, and 5 snap-in fittings of your choice. Model B1 Riser. For series B1 Box. Stackable HDPE Risers extend to grade in 6” increments. Accept 11” x 11” lids and grates. 11” S-35 S-40 P-10 11” 11” 11” 11” 151/2” 2” Drop INSTALLATION IS JUST THIS SIMPLE 1.Position the Distribution Box on level virgin soil. Do not place box on a concrete slab. 2.Install the inlet pipe and outlet pipes. Be sure the bottoms of all pipes rest on virgin soil. 3.Level the Distribution Box and all pipes as needed. 4.Backfill the pipes to within two feet of the Distribution Box. Recheck the level of the box, then backfill up to the top lid ridge. 5.Install and adjust Tuf-Tite Speed Levelers. 6.Place lid on the Distribution Box and finish backfilling. Choice of Fittings S-35 Pipe Seal, for: n Sewer and Drain n SDR 35 n ASTM 3034 n Thin Wall n 1500 Lb. Crush S-40 Pipe Seal, for: n Schedule 40 n 4” Corrugated P-10 Plug, for unused holes Choice of Lids Regular Lid. Molded of rugged HDPE. Inspection Port Lid. For easy access and inspection. Models available to accept either 4” or 6” extension pipes. Tuf-Tite Speed Levelers™ Control the flow of effluent from the Distribution Box. Simply insert a Speed Leveler into each outlet pipe. Rotate each Speed Leveler so the flow is distributed as desired. Available for 3” or 4” PVC pipe. ©1999 Tuf-Tite® Corporation Form 4HD2-3. Printed in USA A full line of innovations for better septic systems 11” 6” 7” 14” Drainage and Septic Products Tuf-Tite®Corporation 1200 Flex Court Lake Zurich, Illinois 60047 4-Hole Distribution Box 4HD24-Hole Dist Cat Sheet 11/8/01 8:09 AM Page 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 ONSITE WASTEWATER TREATMENT SYSTEM DESIGN PROPOSED BALLARD RESIDENCE AND CABIN LOT 4, EAGLE RANCH ESTATES 14239 U.S. HIGHWAY 6 AKA 14239 EAGLE RIVER RANCH ROAD EAGLE COUNTY, COLORADO PROJECT NO. 20-7-337.02 NOVEMBER 30, 2020 PREPARED FOR: RESORT CONCEPTS ATTN: JEFF TOWNSEND P. O. BOX 5127 EDWARDS, COLORADO 81632 (jtownsend@resortconceptsco.com) Kumar & Associates, Inc. ® Project No. 20-7-337.02 TABLE OF CONTENTS INTRODUCTION ...................................................................................................................... - 1 - PROPOSED CONSTRUCTION ................................................................................................ - 1 - SITE CONDITIONS ................................................................................................................... - 1 - SUBSURFACE CONDITIONS ................................................................................................. - 2 - OWTS ANALYSIS .................................................................................................................... - 3 - DESIGN RECOMMENDATIONS ............................................................................................ - 3 - SOIL TREATMENT AREA................................................................................................... - 4 - OWTS COMPONENTS ......................................................................................................... - 5 - OWTS OPERATION AND MAINTENANCE.......................................................................... - 7 - OWTS HOUSEHOLD OPERATION .................................................................................... - 8 - OWTS MAINTENANCE ....................................................................................................... - 8 - OWTS CONSTRUCTION OBSERVATION ............................................................................ - 9 - LIMITATIONS ........................................................................................................................... - 9 - FIGURES FIGURE 1A – VICINITY MAP FIGURE 1B – OWTS SITE PLAN FIGURE 2 – USDA GRADATION TEST RESULTS FIGURE 3 – SOIL TREATMENT AREA CALCULATIONS FIGURE 4 – SOIL TREATMENT AREA PLAN VIEW FIGURE 5 – SOIL TREATMENT ARE CROSS SECTION ATTACHMENTS VALLEY PRECAST 1,500 GALLON, TWO-CHAMBER SEPTIC TANK DETAIL TUF-TITE 4-HOLE DISTRIBUTION BOX DETAIL Kumar & Associates, Inc. ® Project No. 20-7-337.02 INTRODUCTION This report provides the results of an onsite wastewater treatment system (OWTS) design for the proposed Ballard residence and cabin to be located on Lot 4, Eagle River Ranch, 14239 Hwy 6 (aka 14239 Eagle River Ranch Road), Eagle County, Colorado. The purpose of the report was to provide design details for the OWTS in accordance with the 2018 Eagle County Environmental Health Department Onsite Wastewater Treatment System Regulations and the Colorado Department of Public Health and Environmental Regulation #43. The services are supplemental to our agreement for professional services to Resort Concepts dated June 11, 2020. We previously conducted a subsoil study for foundation design of the proposed residence at the site and presented our findings in a report dated November 10, 2020, Project No. 20-7-337. PROPOSED CONSTRUCTION The residence will be a one- to two-story structure over an unfinished basement level with an attached garage located near the middle portion of the lot as shown on Figures 1A and 1B. The basement and garage floors will be slab-on-grade. The residence will initially have two bedrooms. The existing cabin will be moved approximately 200 feet to the northeast of its current location, see Figure 1B. The cabin has one bedroom. The soil treatment area (STA) will be sized for 5 bedrooms for the possible future additions of bedrooms (in the basement area) to the residence. The STA for the OWTS will be located to the west of the proposed residence as shown on Figure 1B. Water service will be provided by an onsite well located to the east of the proposed residence. The planned route of the water line from the well to the residence is shown on Figure 1B. If proposed construction is different than that described, we should be contacted to re-evaluate our design recommendations. SITE CONDITIONS The site has been developed with several existing structures and an older cabin located on the site as shown on Figure 1B. The ground surface has been graded some, apparently as part of the existing development. The terrain is gently sloping down to the south towards the Eagle River at grades from about 3 to 5%. The Eagle River borders the south side the site and is about 15 feet lower in elevation. Vegetation consists of sparse grass, sagebrush and weeds. There is an irrigation ditch south of the proposed residence and approximately 55 feet south of the proposed STA, see Figure 1B. - 2 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 There is an apparent sinkhole located to the east the proposed residence approximately as shown on Figure 1B. The sinkhole is about 10 feet in diameter and 4 feet deep, and has been partially backfilled including with some debris. We are not aware of any other surface depressions on the site; however, the previous grading may have covered other surface depressions. SUBSURFACE CONDITIONS The field exploration for the OWTS was conducted on August 7, 2020. Three profile pits (Profile Pits 1, 2 and 3) were excavated with a backhoe at the approximate locations shown on Figure 1 to evaluate the subsurface conditions at proposed STA for the OWTS. The pits were logged by a representative of Kumar & Associates. Logs of the profile pits are provided below. Log of Profile Pit 1 Depth USDA Classification 0’-3” TOPSOIL; organic sandy loam, loose, slightly moist, dark brown. 3”-8’ SANDY LOAM; moderately blocky structure, loose, slightly moist to moist, brown. • Disturbed bulk sample obtained from 4 to 5 feet. • Bottom of pit @ 8 feet. • No free water or redoximorphic features observed at time of pit excavation. Log of Profile Pit 2 Depth USDA Classification 0’-1” TOPSOIL; organic sandy loam, loose, slightly moist, dark brown. 1”-8’ SANDY LOAM; moderate blocky structure, loose, slightly moist to moist, brown. • Bottom of pit @ 8 feet. • No free water or redoximorphic features observed at time of pit excavation. Log of Profile Pit 3 Depth USDA Classification 0’-3” TOPSOIL; organic sandy loam, loose, slightly moist, dark brown. 3”-8’ SANDY LOAM; moderately blocky structure, loose, slightly moist to moist, brown. • Disturbed bulk sample obtained from 3 to 4 feet. • Bottom of pit @ 8 feet. • No free water or redoximorphic features observed at time of pit excavation. The soils encountered in profile pits below about 1 to 3 inches of topsoil consisted of Sandy Loam to the depths explored of 8 feet. Hydrometer and gradation analyses were performed on a disturbed bulk sample of the soils from Profile Pit 1 from 3 to 4 feet depth with the results - 3 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 provided on Figure 2. The tested sample (minus No. 10 size sieve fraction) classifies as Sandy Loam per the USDA system. Based on the profile pit tactile evaluations and laboratory testing, the soils have been classified as Soil Type 2 per State regulations. No free water was encountered in the pits nor indications of seasonal high groundwater observed at the time of the pit excavations. The soils at the STA have been classified as Type 2 per State regulations, which equates to a long-term acceptance rate (LTAR) of 0.60 gallons per square foot per day. OWTS ANALYSIS Based on the site conditions and profile pit evaluations, the evaluated area should be suitable for a conventional infiltration soil treatment system consisting of chambers in a trench configuration. The STA will be located west of the residence. The base of the soil treatment trenches will be in Sandy Loam soils (Soil Type 2) for which we will use an LTAR of 0.60 gallons per square foot per day to size the STA. The system will be designed for five bedrooms and an average daily flow of 75 gallons per person with double occupancy in the first three bedrooms in the residence and single occupancy in the other bedroom and double occupancy in the cabin for a total of 9 persons. At the planned cabin location, there appears to be adequate elevation drop for gravity flow to the septic tank, if this is not the case we should review our design. The sewage will gravity flow from the residence and the cabin to the septic tank for primary treatment and then gravity flow to the STA for dispersal and final treatment. Any basement facilities will need to be pumped to the tank and should be designed by a plumber. The STA will consist of three trenches with Infiltrator chambers. Equal distribution will be provided to the trenches by a distribution box. A 50 feet minimum setback from the STA is required to the irrigation ditch along the south side of the site. The setback is shown on Figure 1. A 50 feet minimum setback is required from the well to the sewer line. A 5 feet minimum setback is required from the water supply line to the sewer line. As designed, the distance from the well to the sewer line from the cabin is at least 70 feet. The septic tank is required to be a minimum of 5 feet from the residence and the STA. 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. A layout of the proposed OWTS components is provided on Figure 1B. If conditions encountered during construction are - 4 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 different than those that are described in this report, please contact us to re-evaluate our design recommendations. SOIL TREATMENT AREA • The STA will consist of three trenches with 22 Infiltrator Quick 4 Plus Standard chambers in each trench placed in the native Sandy Loam soils (66 chambers total). Equal distribution will be provided to the trenches by a distribution box. • The STA was sized based on an LTAR of 0.60 gallons per square feet per day. • Each chamber was allowed 12 square feet of area. A 30% reduction of the STA size was applied for use of Infiltrator chambers in a trench configuration. The total STA is 792 square feet. Soil treatment area calculations are shown on Figure 3. • A minimum of four feet of undisturbed soil between the trenches is required. • A minimum of 12 inches and a maximum of 24 inches of cover soil should be placed over the top of the chambers. • The trenches should be oriented along ground contours to minimize soil cut and cover. • The base and sidewalls of the trench excavations should be scarified prior to the chamber placement. • Backfill should be graded to deflect surface water away from the STA and should be sloped at 3 horizontal to 1 vertical or flatter. • Disturbed soil 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 the knockouts provided in the Infiltrator end caps. Install ports at each end of each trench. The inspection port piping should be screwed into the top to the chambers and should not extend down to the ground surface inside the chambers. The inspection ports should extend at least 8 inches above the finished ground surface or be protected in a valve box at finished grade. • A plan view of the STA is presented on Figure 4 and a cross section of the STA is presented on Figure 5. • The STA must have a minimum setback of 25 feet from any subsurface drain or stormwater structure. • The STA must have a minimum 25 feet setback to any potable water supply line. • The STA must have a minimum 50 feet setback to the irrigation ditch. • The STA must have a minimum 20 feet setback to the residence. - 5 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 • The STA must have a minimum 100 feet setback to any well. • The STA must have a minimum 5 feet setback to the septic tank. 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, two-chamber septic tank will be used for primary treatment. A detail of the tank is provided as an attachment to the report. • An effluent filter should be installed in the tank outlet tee. • The tank must have a minimum 5 feet setback to the residence and from the STA. • The tank must have a minimum of 10 feet setback to any potable water supply lines. • The tank must have a minimum of 50 feet setback to the irrigation ditch or any well. • The tank must have a minimum setback of 10 feet from any subsurface drain or stormwater structure. • 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 may 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 lines 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. Schedule 40 PVC is required beneath all driveway surfaces. • The cabin sewer pipes should be double encased with larger diameter schedule 40 pipe within 10 feet encroachment on either side of drainage near cabin site. • The sewer pipes 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. - 6 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 • A minimum 24 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 and 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. • The sewer pipes 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 in the pipe could cause standing effluent to freeze and damage the 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. • The sewer lines from the cabin and from the residence should be connected with a “Y” connection prior to entering the tank. A “T” connection is not suitable. • The sewer line locations shown on Figure 1B are considered conceptual. We assume that there will be only one sewer line each exiting the residence and the cabin. 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 more than one sewer line exiting the buildings. Effluent Transport Piping • The effluent transport pipe should be 4-inch diameter SDR35 piping sloped at 2% minimum to flow from the septic tank to the distribution box and from the distribution box to each trench. Piping should extend at least 6 inches into the top knockout provided in the Infiltrator end caps and be screwed in place. Splash plates should be installed beneath the inlet piping to help limit scouring of the infiltrative soil surface in the chambers. • 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 to the 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 - 7 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 least 2 inches of rigid foam insulation in these areas. If adequate cover soil is not possible, we should re-evaluate the condition prior to installation. • Schedule 40 PVC pipe is required underneath all 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. • All 90-degree bends should be installed using a 90 degree long-sweep or by using two 45-degree elbows. Distribution Box • The distribution box will be used to equally divide effluent flow between the trenches. We recommend the Tuf-Tite 4-Hole Distribution Box since it is easily accessible from the ground surface for maintenance. A copy of the distribution box detail is provided as an attachment to this report. • The distribution box outlet pipes should be equipped with Tuf-Tite speed levelers for ease of initial setup and adjustment over time. • The distribution box should be a minimum of 18 inches below grade with risers and an access lid at or above grade. • The distribution box must be accessible from ground surface for inspection and maintenance per the State guidelines. • The distribution box must be installed level on a compacted road base subgrade to ensure equal effluent distribution. If settlement of the distribution box occurs, unequal effluent distribution may take place which could cause hydraulic overload of one of the trenches and potential failure. The distribution box should be monitored periodically, and the speed levelers should be adjusted as necessary for levelling. • The ground surface above and around the distribution box should be graded to drain away surface water to prevent standing water near the distribution box which could freeze or cause settlement. 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. - 8 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 OWTS HOUSEHOLD OPERATION • 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 soil absorption system. • Do not irrigate the area on top of or directly upgradient of the soil absorption field as this may cause a hydraulic overload. • Do not dispose of household waste down 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 soil absorption system. • 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 soils absorption system. • 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, distribution box and STA at least annually for problems or signs of failure. • The effluent filter in the septic tank should be cleaned annually by spray washing solids into the first chamber of the septic tank. • The 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 STA, which may shorten its life span. - 9 - Kumar & Associates, Inc. ® Project No. 20-7-337.02 • Pumping of the septic tank should take place when the level of the sludge and scum layers combined take up about 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 inspection). 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 and 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 should provide continued consultation and field services during construction to review and monitor the implementation of our recommendations, and to verify that the recommendations have been appropriately interpreted. Significant design changes may require additional analysis or modifications to our design. It is our opinion that the designed location of the OWTS components does not violate any setback requirements of the current Eagle County Regulations. Below is a table of common minimum horizontal setbacks to OWTS components. Refer to the Eagle County Regulations for a complete list of required setbacks. We recommend the OWTS components be surveyed by a Professional Colorado Land Surveyor. BALLARD RESIDENCE LOT 4 14239 EAGLE RIVER RANCH ROAD EAGLE RIVER HIGHWAY 6 INTERSTATE 70 EAGLE COUNTY AIRPORT COOLEY ME S A R O A D FIGURE 1B Kumar & Associates EAGLE RIVER RANCH ROADBALLARD RESIDENCELOT 4, EAGLE RANCH ESTATES14239 EAGLE RIVER RANCH ROADX XXX XXXXXXXXOEOEOEOEOEOEOEOEOEOEOEOEOEOEOEOE OE OE OE OE OE OE OE OEWSWSWSWSWSWSWSWSWSWSWSWSEEEEEEEEEGD11786443.80GPS117811936443.81117820766443.97BS21146443.972076SSSSSSSSSSSSSSSSSSSSSSSSSSSSSS SSSSKumar & Associates SILT COBBLES COARSE GRAVEL MEDIUMMEDIUMV. FINE SAND CLAY FINE CO.FINEV. CO.CO.FINE Kumar & Associates Kumar & Associates Kumar & Associates Notes: &KDPEeUssKoXOGEeLQstDOOeGOeYeOoQDsFDULILeGJUoXQGsXUIDFe&oQFUetesDQGPD\EeXseGDsDOeYeOLQJFoXUseLI QeFessDU\ &DUesKoXOGEetDNeQE\tKeFoQtUDFtoUtoDYoLGFoPSDFtLoQoItKeQDtLYesoLOsLQtKetUeQFKDUeDs7KeEDseDQGsLGeZDOOsoI tUeQFKe[FDYDtLoQssKoXOGEesFDULILeGSULoUtoFKDPEeULQstDOODtLoQ $OOSLSLQJsKoXOGKDYeDUDtLQJoI6'5oUstUoQJeU &KDQJestotKLsGesLJQsKoXOGQotEePDGeZLtKoXtFoQsXOtDtLoQDQGDSSUoYDOE\.XPDU $ssoFLDtes 5eIeUtotKe(DJOe&oXQt\2QsLte:DsteZDteU6\steP5eJXODtLoQsIoUotKeUDSSOLFDEOesSeFLILFDtLoQs Infiltrator Quick 4 Plus Standard Chamber Installed Level Scarify ground surface prior to chamber placement. Excavate 36" Wide Trench Approx. Existing Gro u n d S u r f a c e 12" min. 24" max. Cover Soil Graded to Deflect Surface Water Native Soil 4' Min. Undisturbed Soil Between Trenches Kumar & Associates Notes 1.Chambers should be installed level on a scarified ground surface. Concrete sand may be used as a leveling course if necessary. 2.Care should be taken by the contractor to avoid compaction of the native soils in the trench areas. The base and side walls of trench excavations should be scarified prior to chamber installation. 3.Changes to this design should not be made without consultation and approval by Kumar & Associates. Tough Problem Providing a simple, reliable, and permanent means for dividing septic tank effluent flow. TUF-TITE Solution A strong, stable, permanent, non-corrosive Tuf-Tite Distribution Box, with a Tuf-Tite Speed Leveler in each outlet. Snap-in pipe seals They’re patented. Simply insert your PVC pipe and push it through the flexible, polyethylene Tuf-Tite seal. Pipes fit watertight. Installation couldn’t be easier. Tuf-Tite® Distribution Box. THE TOUGH ONE! n Injection molded HDPE n Non-corrosive n Simple to install n Easy to level In a septic environment, no other material can match High Density Polyethylene in delivering a lifetime of trouble-free service. Tuf-Tite Distribution Boxes are injection molded, using only premium HDPE which contains no fillers or foam. They’re permanent Unlike cement-based pipe grout, Tuf-Tite seals will not crack or corrode in septic conditions. They stay pliable and watertight permanently. 4-Hole Distribution Box4-Hole Dist Cat Sheet 11/8/01 8:09 AM Page 1 nInjection molded.Exceptionallystrong.nHDPE is non-corrosive in a septic environment. nPatented snap-in pipe seals simplify installation. Interlocking Lid. Heavy-dutyHDPE Lid is ribbed for addedstrength and rigidity. Slottedsides interlock on theDistribution Box to assure atight fit.The 4HD2 Distribution Box comes complete with a Regular Lid or an Inspection Port Lid, and 5 snap-in fittings of your choice. Model B1 Riser. For series B1 Box. Stackable HDPE Risers extend to grade in 6” increments. Accept 11” x 11” lids and grates. 11” S-35 S-40 P-10 11” 11” 11” 11” 151/2” 2” Drop INSTALLATION IS JUST THIS SIMPLE 1.Position the Distribution Box on level virgin soil. Do not place box on a concrete slab. 2.Install the inlet pipe and outlet pipes. Be sure the bottoms of all pipes rest on virgin soil. 3.Level the Distribution Box and all pipes as needed. 4.Backfill the pipes to within two feet of the Distribution Box. Recheck the level of the box, then backfill up to the top lid ridge. 5.Install and adjust Tuf-Tite Speed Levelers. 6.Place lid on the Distribution Box and finish backfilling. Choice of Fittings S-35 Pipe Seal, for: n Sewer and Drain n SDR 35 n ASTM 3034 n Thin Wall n 1500 Lb. Crush S-40 Pipe Seal, for: n Schedule 40 n 4” Corrugated P-10 Plug, for unused holes Choice of Lids Regular Lid. Molded of rugged HDPE. Inspection Port Lid. For easy access and inspection. Models available to accept either 4” or 6” extension pipes. Tuf-Tite Speed Levelers™ Control the flow of effluent from the Distribution Box. Simply insert a Speed Leveler into each outlet pipe. Rotate each Speed Leveler so the flow is distributed as desired. Available for 3” or 4” PVC pipe. ©1999 Tuf-Tite® Corporation Form 4HD2-3. Printed in USA A full line of innovations for better septic systems 11” 6” 7” 14” Drainage and Septic Products Tuf-Tite®Corporation 1200 Flex Court Lake Zurich, Illinois 60047 4-Hole Distribution Box 4HD24-Hole Dist Cat Sheet 11/8/01 8:09 AM Page 2 - OL 1 ti u LL