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HomeMy WebLinkAbout535 Willowstone Pl - 211106115003Environmental Health Department P.O. Box 179 500 Broadway Eagle, CO 81631-0179 Phone: (970) 328-8730 Fax: (970) 328-7185 Permit Permit No. OWTS-017446-2019 Permit Type: OWTS Permit Work Classification: New Permit Status: Active Issue Date: 9/24/2019 Expires: 1/22/2020 On-Site Wastewater Treatement System Project Address Parcel Number 535 WILLOWSTONE PL, GYPSUM AREA,211106115003 Owner Information Address Gary Defina Po Box 4140 Eagle, CO 81631 Phone: (970) 376-6702 Cell: (970) 376-6702 Email: gary@definaconstruction.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 Defina Construction, INC gary@definaconstruction.c om (970) 376-6702OWTSPL-000028-20 19 Permitted Construction / Details: Install the OWTS exactly as depicted in the Kumar & Associates, Inc design dated September 10, 2019, stamped, signed and dated September 11, 2019 by David A. Young, PE. The system will serve a 5 bedroom residence, and is designed to serve a six bedroom residence, to allow for a future connection to an ADU. The OWTS consists of a 2,000 gallon Valley Precast septic tank with an effluent filter in the outlet tee, followed by a Tuf-Tite 6-Hole distribution box, set level and made accessible at grade, equipped with speed levelers to equally distribute effluent to four shallow trenches, each equipped with 19 Infiltrator Quick4 Plus Standard chambers, for a total of 76 chambers. Be sure to install inspection ports at both ends of each trench. Maintain all setbacks and elevations. Note: The location of the waterline was not known at the time of design. Make sure to verify 25 foot setback from waterline to the soil treatment area, and 10 feet from waterline to the tank, prior to installation. In case of waterline setback encroachment, notify the design engineer for additional recommendations. 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 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 or occupancy of the dwelling. 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 Claire Lewandowski Date September 24, 2019 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 Tuesday, September 24, 2019 1 June 25, 2020 Gary Defina gary@definaconstruction.com RE: Final approval of the: Septic System Installation, OWTS-017446-2019 Property location: 535 Willowstone Pl, Eagle County Mr. Defina, This letter is to inform you that the above-referenced permit has been inspected and finalized. The Onsite Wastewater Treatment System (OWTS) was designed and installed to serve six bedrooms, the five bedroom primary residence and a future one bedroom ADU on the above property. Additional information about the maintenance your septic system needs can be accessed through our website links, provided on the Environmental Health Department’s septic system resource page. Be aware that changes in the use of your property or alterations of your building may require commensurate changes to, or relocation of, your septic system. Landscape features, trees with tap roots, irrigation systems and parking areas above the soil treatment area can cause premature system failure. It is equally important that you notice and immediately repair dripping faucets and hissing toilets as this will certainly cause the system to fail. If you have any questions regarding this information, please contact us at (970) 328 -8755 and reference the OWTS septic permit number. Best Regards, Claire Lewandowski, REHS Environmental Health Specialist III Attachments: Certification Letter and Design – Septic System Flyer – Final Letter PUBLIC HEALTH & ENVIRONMENT (970) 328-8755 FAX: (970) 328-8788 environment@eaglecounty.us 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 June 8, 2020 Defina Construction Attn: Gary Defina P. O. Box 4140 Eagle, Colorado 81631 (definaconst@aol.com) Project No. 19-7-334.02 Permit No. OWTS-017446-2019 Subject: Certification of Onsite Wastewater Treatment System, Proposed Residence, Lot 3, Eagle River Preserve, 535 Willowstone Place, Gypsum, Eagle County, Colorado Dear Gary: 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 Defina Construction dated May 24, 2019. We previously designed the OWTS for the residence as submitted in our design in a report dated September 10, 2019, Project No. 19-7-334.02. The system was designed for five bedrooms in the residence and an additional bedroom in a future ADU for a total of 6 bedrooms and 10 persons. The OWTS was installed by Defina Construction under Eagle County Permit No. OWTS-017446-2019. We performed our as-built evaluation on May 29, 2020. The OWTS components observed included: sewer lines, cleanouts, 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 designed Tuf-tite 6-hole distribution box was changed to a Polylok 6-hole distribution box. The change is acceptable to us. Additionally, a sewer line was laid for the future construction of an ADU. The locations of the sewer lines are shown on Figure 1. It is our opinion that the OWTS was installed in general conformance with the above referenced design. Kumar & Associates OWTS PHOTOGRAPH LOG PROPOSED RESIDENCE LOT 3, EAGLE RIVER PRESERVE 535 WILLOWSTONE PLACE GYSPUM, EAGLE COUNTY, COLORADO Project No. 19-7-334.02 Photograph 1: Cleanout and sewer line exiting residence. Photograph 2: Sewer line from residence to septic tank. OWTS PHOTOGRAPH LOG PROPOSED RESIDENCE LOT 3, EAGLE RIVER PRESERVE 535 WILLOWSTONE PLACE GYSPUM, EAGLE COUNTY, COLORADO Project No. 19-7-334.02 Photograph 3: Sewer line for future construction (left) and sewer line from residence (right). Photograph 4: Sewer line for future construction and cleanouts. OWTS PHOTOGRAPH LOG PROPOSED RESIDENCE LOT 3, EAGLE RIVER PRESERVE 535 WILLOWSTONE PLACE GYSPUM, EAGLE COUNTY, COLORADO Project No. 19-7-334.02 Photograph 5: Cap and cleanout at end of sewer line for future construction stub. Photograph 6: Valley Precast 2,000-gallon, 2-chamber septic tank and both sewer lines entering at wye fitting. OWTS PHOTOGRAPH LOG PROPOSED RESIDENCE LOT 3, EAGLE RIVER PRESERVE 535 WILLOWSTONE PLACE GYSPUM, EAGLE COUNTY, COLORADO Project No. 19-7-334.02 Photograph 7: Effluent filter at outlet of septic tank. Photograph 8: Effluent line to Polylok 6-hole distribution box and to soil treatment area (STA). OWTS PHOTOGRAPH LOG PROPOSED RESIDENCE LOT 3, EAGLE RIVER PRESERVE 535 WILLOWSTONE PLACE GYSPUM, EAGLE COUNTY, COLORADO Project No. 19-7-334.02 Photograph 9: Polylok 6-hole distribution box. Inlet on top- left. Photograph 10: Soil treatment area (STA) with observation ports. 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 RESIDENCE LOT 3, EAGLE RIVER PRESERVE 535 WILLOWSTONE PLACE GYPSUM, EAGLE COUNTY, COLORADO PROJECT NO. 19-7-334.02 SEPTEMBER 10, 2019 PREPARED FOR: DEFINA CONSTRUCTION ATTN: GARY DEFINA P.O. BOX 4140 EAGLE, CO 81631 (definaconst@aol.com) Kumar & Associates, Inc. ® Project No. 19-7-334.02 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 1 – OWTS SITE PLAN FIGURE 2 – USDA SOIL 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 2,000 GALLON, TWO-CHAMBER SEPTIC TANK DETAIL TUF-TITE 6-HOLE DISTRIBUTION BOX Kumar & Associates, Inc. ® Project No. 19-7-334.02 INTRODUCTION This report provides the results of an onsite wastewater treatment system (OWTS) design for a proposed residence located on Lot 3, Eagle River Preserve, 535 Willowstone Place, Gypsum, 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 Regulation #43. The design services are supplemental to our agreement for professional services to Defina Construction dated May 24, 2019. PROPOSED CONSTRUCTION The proposed residence will be single-story over a walkout basement, five-bedroom structure with an attached garage located near the middle of the building envelope as shown on Figure 1. The ground floors will be slab-on-grade. The OWTS will be designed for 6 bedrooms to allow the possibility of a future one-bedroom auxiliary dwelling unit (ADU). The soil treatment area (STA) will be located to the north of the proposed residence, see Figure 1. Water service will be provided by public water supply from Willowstone Place to the south of the residence. The route of the water line is not yet determined, but the route is unlikely to impact the OWTS. If proposed construction is different than that described, we should be contacted to re-evaluate our design recommendations. SITE CONDITIONS The lot was vacant and the ground surface appeared mostly natural at the time of our field exploration. The terrain is gently sloping down to the north towards the Eagle River at grades form about 4 to 6%. Elevation difference across the proposed STA is about 1 to 2 feet. The elevation difference from the proposed residence (walkout) basement level to the STA ground surface is estimated to be about 3 feet. Vegetation consists of grass and weeds with sage brush. The northern part of the lot is apparently in the 100-year flood plain of the Eagle River as shown on Figure 1. There are residences on the adjacent Lots 2 and 4. - 2 - Kumar & Associates, Inc. ® Project No. 19-7-334.02 SUBSURFACE CONDITIONS The field exploration for the OWTS was conducted on August 27, 2019. Two profile pits (Profile Pits 1 and 2) were excavated with a backhoe at the approximate locations shown on Figure 2 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’-2’ TOPSOIL; organic sandy loam, firm, moist, dark brown. 2’-8½’ SANDY LOAM; moderate blocky structure, medium stiff, moist, brown. • Disturbed bulk sample obtained from 5 to 6 feet. • Bottom of pit @ 8½ feet. • No redoximorphic features observed at time of pit excavation. Log of Profile Pit 2 Depth USDA Classification 0’-2’ TOPSOIL; organic loam, firm, moist, dark brown. 2’-4½’ SANDY LOAM; moderate blocky structure, stiff, slightly moist, brown. 4½’-8’ SAND; gravelly, single grain structure, medium dense, moist, brown. 8’-9’ SILT LOAM; moderate blocky structure, stiff, very moist, brown • Disturbed bulk sample obtained from 5 to 6 feet. • Bottom of pit @ 9 feet. • No free water or redoximorphic features observed at time of pit excavation. The soils encountered in profile pits below, about 2 feet of topsoil, consisted of Sandy Loam to the pit depth of 8½ feet in Profile Pit 1 and Sandy Loam to a depth of 4½ feet in Pit 2 where underlain by Sand from 4½ to 8 feet and Silt Loam from 8 to 9 feet. Hydrometer and gradation analyses were performed on a disturbed bulk sample of the soils from Profile Pit 1 from 5 to 6 feet depth with the results 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 design soils have been classified as Soil Type 2 per State regulations, which equates to a long-term acceptance rate - 3 - Kumar & Associates, Inc. ® Project No. 19-7-334.02 (LTAR) of 0.60 gallons per square foot per day. No free water was encountered in the pits nor indications of seasonal high groundwater observed at the time of the pit excavations. 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 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 the five bedrooms of the proposed residence and an average daily flow of 75 gallons per person with double occupancy in the first three bedrooms and single occupancy in the fourth and fifth bedrooms, and one additional bedroom with double occupancy for a future ADU. In total, the OWTS will be designed for six bedrooms and 10 persons. The effluent will gravity flow from the residence to the septic tank for primary treatment and then gravity flow to the STA for dispersal and final treatment. The STA will consist of four trenches with Infiltrator Quick 4 Plus Standard chambers. Equal distribution will be provided to the chambers and trenches by a distribution box. A 10 feet minimum setback from the STA is required to the property lines. The setbacks are shown on Figure 1. A 25 feet setback is required from the proposed STA to any potable water supply lines. The location of the water supply line is not currently designed. If the water supply line is within 25 feet of the proposed STA, we should be notified for additional recommendations. 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 1. If conditions encountered during construction are different than those that are described in this report, contact us to re-evaluate our design recommendations. - 4 - Kumar & Associates, Inc. ® Project No. 19-7-334.02 SOIL TREATMENT AREA • The STA will consist of four trenches with 19 Infiltrator Quick 4 Plus Standard chambers placed in the native Sandy Loam soils (76 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 design size is 912 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. A swale to divert surface water run-off may be needed along the up-slope side of the STA. • 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 maintain a minimum 25 feet setback from the on-site water supply line. The STA must maintain a minimum 10 feet setback from the lot property line. - 5 - Kumar & Associates, Inc. ® Project No. 19-7-334.02 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 2,000 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 be a minimum of five feet from any structure and from the STA. The tank must be a minimum of 10 feet from any potable water supply lines. • The tank must be set level. The excavation bottom must be free of large rocks or other objects that could damage the tank during placement. A road base or gravel bedding material 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 line to the septic tank should not be less than the diameter of the building drains and not less than 4 inches in diameter. • The sewer pipe should have a rating of SDR35 or stronger. Schedule 40 PVC pipe is required beneath all driveway surfaces. • The sewer pipe should be sloped between 2% to 4% to help limit disturbance of solids in the tank and potential sewage bypass of the first chamber of the tank. If a steeper slope is needed, this can be accomplished with vertical step-downs in the sewer line. • A minimum 36 inches of cover soil should be provided over the sewer pipe. 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 - 6 - Kumar & Associates, Inc. ® Project No. 19-7-334.02 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 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 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 line location shown on Figure 1 is considered conceptual. We assume that there will be only one sewer line exiting the residence. It is the responsibility of the owner/contractors to locate all sewer line exit locations and connections to the septic tank. We should be notified if there is more than one sewer line exiting the residence. Effluent Transport Piping • The effluent transport pipe should be 4-inch diameter SDR35 piping sloped at a 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 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. - 7 - Kumar & Associates, Inc. ® Project No. 19-7-334.02 • Schedule 40 PVC pipe is required underneath driveway surfaces and should be provided with at least 48 inches of soil cover and be insulated on top and sides with 2-inch-thick 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 6-Hole Distribution Box since it is easily accessible from 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 State guidelines. • The effluent line from the septic tank should be directed downward into the distribution box with a 90-degree elbow inside the box. • 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. 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 - 8 - Kumar & Associates, Inc. ® Project No. 19-7-334.02 residents. We recommend that an OWTS Operation and Maintenance (O&M) Manual be developed. Depending on the complexity of the system, a contract with an OWTS maintenance provider may be prudent. Below are some basic recommendations for the OWTS O&M. OWTS HOUSEHOLD OPERATION • 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 - 9 - Kumar & Associates, Inc. ® Project No. 19-7-334.02 of failure. • The filter 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. • 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 Kumar & 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 G r o 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. TTuuff--TT iittee®® DDiissttrriibbuuttiioonn BBooxx.. TTHHEE TTOOUUGGHH OONN EE!! ■Injection molded HDPE ■Non-corrosive ■Simple to install ■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. 6-Hole Distribution Box ■Injection molded. Exceptionally strong. ■HDPE is non- corrosive in a septic environment. ■Patented snap- in pipe seals simplify installation. ■All Tuf-Tite products are U.V. stabilized. Interlocking Lid. Heavy-duty HDPE Lid is ribbed for added strength and rigidity. Slotted sides interlock on the Distribution Box to assure a tight fit. The 6HD2 Distribution Box comes complete with a Regular Lid or an Inspection Port Lid, and 8 snap-in fittings of your choice. 9” S-35 S-40 P-10 14” 14” 9” 9” 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: ■ Sewer and Drain ■ SDR 35 ■ ASTM 3034 ■ Thin Wall ■ 1500 Lb. Crush S-40 Pipe Seal, for: ■ Schedule 40 ■ 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. Accepts 4” riser 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. ©2005 Tuf-Tite® Corporation Form 6HD2-4. Printed in USA Water-tight Lids and Risers by Tuf-Tite®Drainage and Septic Products Tuf-Tite®Corporation 1200 Flex Court Lake Zurich, Illinois 60047 6-Hole Distribution Box 6HD2