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HomeMy WebLinkAbout1335 Cordillera Wy - 210712204004Environmental Health Department P.O. Box 179 500 Broadway Eagle, CO 81631-0179 Phone: (970) 328-8730 Fax: (970) 328-7185 Permit Permit No. OWTS-021529-2021 Permit Type: OWTS Permit Work Classification: New Permit Status: Active Issue Date: 6/14/2021 Expires: 4/10/2023 On-Site Wastewater Treatement System Project Address Parcel Number 1335 CORDILLERA WY, EDWARDS AREA,210712204004 Owner Information Address Robert Kedrowski 1335 Cordillera WAY Edwards, CO 81632 Phone: (970) 390-4341 Cell: Email: kedrowskibuilders@gmail.com Inspections: For Inspections Call: (970) 328-8755 Engineer Phone Email Best Engineering Solutions and Technologies, Matthew Best (970) 409-9670 matt@bestengineeringusa .com Contractor License Number Phone Email Bronn Excavating Bronn4867@yahoo.com(970) 977-0261OWTSPL-000179-20 22 Permitted Construction / Details: Install the new system exactly as depicted in the B.E.S.T. Engineering Solutions design stamped and signed on June 11th, 2021 by Matthew Best, PE. The new system will be sized to accommodate the maximum daily flows for a 4 bedroom residence. The OWTS consists of one sewer line from the residence. A Valley Precast 1,250 gallon, two compartment septic tank with an effluent filter in the outlet tee will be used. A distribution box equipped with flow equalizers will be accessible at grade. The STA consists of 4 shallow trenches of 13 Infiltrator Quick 4 Plus Standard chambers for a total of 52. An additional test pit adjacent to the STA must be conducted and reviewed by the Design Engineer, prior to installation. 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 Salinsky Date June 14, 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 Thursday, October 13, 2022 1 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-527058-2023 Permit Number: OWTS-021529-2021 Inspection Date: 11/09/2023 Inspector: Permit Type: OWTS Permit Inspection Type: OWTS Final Inspection Work Classification: NewOwner:Kedrowski Builders Job Address:1335 CORDILLERA WY IVR Pin Number:193237 EDWARDS AREA, CO Project:<NONE> Parcel Number:210712204004 Contractor:Phone: (970) 977-0261 / Cell: (970) 977-0261Bronn Excavating Inspection Status: Approved Inspection Notes Inspector Comments Added Item: Septic Tank A Valley Precast 1,250 gallon, two compartment septic tank with an effluent filter in the outlet tee was installed. A distribution box is accessible at grade. Added Item: Record Drawing Received 11/8/2023. Added Item: Record Photos Received 11/8/2023. Added Item: Site and Soil Received 6/1/2021. Added Item: Final Certification Letter Received 11/8/2023. Added Item: General Plan Received 6/1/2021. Added Item: Soil Treatment Area (STA) The STA consists of 4 shallow trenches of 13 Infiltrator Quick 4 Plus Standard chambers for a total of 52. Added Item: Identification of Systems Contractor Bronn Excavating was the licensed installer. Thursday, November 9, 2023 For more information visit: http://www.eaglecounty.us Page 1 of 2 Thursday, November 9, 2023 For more information visit: http://www.eaglecounty.us Page 2 of 2 1393 South Inca Street, Denver, Colorado  Psalm 20  Phone: 303-238-1770  Office@BestEngineeringUSA.com December 22, 2022 Bob and Barbara Kedrowski Kedrowski Builders 1335 Cordillera Way Edwards, Colorado 81632 Subject: Septic Installation Observation & As-built Submittal 1335 Cordillera Way Edwards, Colorado 81632 Project No. 21-1184 At your request, Best Engineering Solutions and Technologies, LLC (BEST) visited the subject site on October 20, 2022, to provide observations during installation of the onsite wastewater treatment system. We used information from our Onsite Wastewater Treatment System Design report, dated April 29, 2021, and revised June 11, 2021, project number 21-1184. Our observations and recommendations are presented below. The onsite wastewater treatment system was observed for consistency with the design as shown in our report, listed above. The tank, pipes, and soil treatment area were installed in general conformance with standard construction practice and our design during our site visit. No deviations from our report are necessary. An as- built drawing had been requested and is attached as Figure 1. Our observation and recommendations submitted in this report are based on the conditions observed during our site visit. Best Engineering Solutions and Technologies, LLC is not responsible for liability associated with construction defects contrary to the recommendations in our design report. If you have any questions regarding this report, please feel free to contact us. Respectfully submitted, BEST ENGINEERING Matthew A. Best, P.E. 12/22/22 Principal Engineer Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com ONSITE WASTEWATER TREATMENT SYSTEM DESIGN 1335 CORDILLERA WAY EDWARDS, COLORADO 81632 PROJECT NUMBER 21-1184 APRIL 29, 2021 REVISED JUNE 11, 2021 PREPARED FOR KEDROWSKI BUILDERS BOB AND BARBARA KEDROWSKI 340 CORDILLERA WAY EDWARDS, COLORADO 81632 Prepared By: Reviewed By: Kamal M. Hasan, E.I.T. Matthew A. Best, P.E. Staff Engineer Project Engineer 6/11/2021 Matthew Best Digitally signed by Matthew Best Date: 2021.06.11 12:14:00 -06'00' 1335 cordillera Way Project Number: 21-1184 [2] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. Table of Contents PURPOSE AND SCOPE OF WORK ...................................................................................................................................................... 3 PROPOSED CONSTRUCTION .............................................................................................................................................................. 3 SITE CONDITIONS ................................................................................................................................................................................ 3 FIELD EXPLORATION ......................................................................................................................................................................... 3 SUBSURFACE CONDITIONS ............................................................................................................................................................... 3 OWTS ANALYSIS .................................................................................................................................................................................. 3 DESIGN RECOMMENDATIONS .......................................................................................................................................................... 3 SETBACKS ............................................................................................................................................................................................. 6 HOMEOWNER PRECAUTIONS ........................................................................................................................................................... 6 LIMITATIONS ........................................................................................................................................................................................ 7 FIGURE 1 –SITE MAP FIGURE 2 – LOCATIONS OF EXPLORATORY TEST PITS FIGURE 3 – TEST PITS LOGS FIGURE 4 – LEGEND AND NOTES FIGURE 5 – SEPTIC LAYOUT FIGURE 6 – SOIL TREATMENT AREA CALCULATIONS FIGURE 7 – SOIL TREATMENT AREA DETAILS 1335 cordillera Way Project Number: 21-1184 [3] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. PURPOSE AND SCOPE OF WORK This report presents the results of an onsite wastewater treatment system (OWTS) design for the project at 1335 cordillera Way in Eagle County, Colorado. The purpose of this report is to provide design details for an OWTS in accordance with the 2018 Eagle County Onsite Wastewater Treatment System Regulations. The project site is shown on Figure 1. Please refer to this report for subsurface information and recommendations. PROPOSED CONSTRUCTION We understand that the proposed residence will be a single-family home with an attached garage. The residence will have four bedrooms. The home will be conventional wood frame construction. If the number of bedrooms for the residence are different from those described above, we should be notified to re-evaluate the recommendations contained in this report. SITE CONDITIONS At the time of our field exploration, the property consisted of vacant lot. The site is bounded by residential single- family homes and undeveloped lots. The topography in the area slopes toward the north and east and is at an approximate ranging elevation of 7,870 to 7,980 feet MSL. FIELD EXPLORATION Exploratory test pits were excavated on April 20, 2021, approximately at the locations shown on Figure 2 to evaluate the soil treatment area (STA) subsurface conditions. The test pits were excavated with a mini-excavator and logged by a representative of BEST. Samples of the soils were taken with disturbed sampling methods and the depths of the samples are shown on the Test Pits Logs, Figure 3 and Legend and Notes, Figure 4. SUBSURFACE CONDITIONS TP-1 encountered native sandy loam to the maximum depth explored of 6 feet Below Existing Grade (BEG). TP-2 encountered native loam to the maximum depth explored of 8 feet BEG. The soils encountered were slightly moist to moist. Groundwater was not encountered at the time of the pits. Fluctuations in the groundwater levels may occur seasonally or with precipitation events. Samples taken from the exploratory test pits were retained for laboratory testing and inspected by the project engineer. The results of the tests performed on the field samples are shown on Table 1. Laboratory testing included index property tests, for moisture content and gradation analysis. The testing was performed on disturbed bulk samples and were in general conformance with recognized test procedures, primarily, ASTM and United States Department of Agriculture (USDA). OWTS ANALYSIS We recommend trench construction and infiltrator chambers be used to provide effluent treatment from the proposed residence. The STA was sized for a maximum of four bedrooms, Type 2 soil with a Long-term acceptance rate (LTAR) of 0.60, and TL1. Calculations are provided on Figure 6. The effluent will gravity flow to the septic tank for primary treatment and gravity flow through a distribution box with equalizers to the STA for final treatment. DESIGN RECOMMENDATIONS The design recommendations presented below are based on the proposed construction, the site, and subsurface conditions encountered and our experience in this area. If conditions encountered during construction are 1335 cordillera Way Project Number: 21-1184 [4] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. different than those that are described in this report, please contact us and we will re-evaluate our design recommendations. SOIL TREATMENT AREA 1. The treatment system will consist of four trenches, and 13 infiltration chambers long, see Table A below. The trenches shall be a maximum width of 36-inches and shall be spaced at least 48-inches from trench wall to trench wall. The STA was placed outside the former structure area which has been previously removed. 2. The chambers shall be Quick4 Plus Standard infiltrator chambers, or an approved equivalent. Chambers shall be installed in accordance with the manufacture’s recommendations and remain level across the length of each set of chambers. 3. Topsoil within the proposed STA shall be stripped and removed prior to excavation of the trenches. 4. The maximum cut for the uphill side of the excavation shall be 3 feet to the infiltration surface. The base excavation should be scarified prior to chamber placement. 5. A minimum 12 inches of cover soil should be placed over the geotextile. The soil cover may consist of native sandy loam Type 1 or 2 materials. 6. Backfill should be graded to deflect surface water away from the STA and should be sloped at 3H:1V maximum. 7. Disturbed soil should be re-vegetated as soon as possible with a native grass seed mixture. No trees, shrubs, or other plants with deep roots should be planted on or near the STA as this may damage the system. 8. Four-inch diameter inspection ports should be installed vertically into the beginning and end of each trench. The inspection ports should extend at least 8 inches above the finished ground surface or be protected in a valve box at finished grade. The portion that lies within the gravel layer should be perforated. 9. A plan view of the STA is presented on Figure 2 with a cross section view presented on Figure 5. TABLE A – TRENCH CHAMBER SCHEDULE Trench Number Number of Chambers Trench Length (ft) Anticipated Infiltration Elevation (ft) Trench 1 13 52 7,928 Trench 2 13 52 7,930 Trench 3 13 52 7,932 Trench 4 13 52 7,934 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 1. A minimum 1,250 gallon, two-chamber, precast septic tank is proposed for the OWTS (Valley Precast 1250M-2CP, or equivalent). The first compartment must be at least 625 gallons. The baffle or wall between the first and second compartments must be properly sealed to prevent cross-compartment flow. 2. The tank must be set level. The bottom of the excavation shall be free of large rocks or other objects that could damage the tank during placement. A gravel or road base bedding material may be necessary to prevent tank damage during placement and act as a leveling course. 3. Tank shall be backfilled uniformly on all sides in lifts less than 24” and mechanically compacted. 4. Install tank with 2 feet minimum cover soil for frost protection. Maximum soils cover depth is 4 feet. 1335 cordillera Way Project Number: 21-1184 [5] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. 5. The septic lids must extend to final surface grade and made to be easily located. 6. An effluent filter shall be located prior to exiting the tank. The effluent filter shall be provided with a handle located within 12-inches of the tank lid to allow for removal and cleaning of the screen. SEWER PIPE 1. The sewer line from the residence to the septic tank should not be less than the diameter of the building drain and not less than 4 inches in diameter. 2. Install cleanout pipes within 5 feet of the building foundations and if necessary, where the sewer pipe bends 90 degrees or more and every 100 feet of sewer pipe. 3. The sewer pipe should have a rating of SDR35 or better. The sewer pipe should be sloped between 2% and 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 necessary, this can be accomplished with vertical step-downs in the sewer line, prior to the last 5 feet the tank. 4. A minimum of 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. We recommend a minimum of 48 inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with 2- inch think blue foam insulation board. If adequate soil cover is not possible, we should be contacted for re-evaluation prior to construction. If the sewer pipe passes under a paved area the pipe shall be SDR 35. 5. 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 that 2.5-inches in diameter to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and damage piping. 6. All 90-degree bends should be installed using a 90-degree long sweep or by using two 45-degree elbows. 7. The sewer line location shown on Figure 2 is considered conceptual. We assume that there will be only one sewer line exiting the residence. It is the responsibility of the owner to locate all sewer line exit locations and connections to the septic tank. We should be notified if there are other sewer lines exiting the residences. EFFLUENT PIPING 1. We recommend a 3.0-inch diameter, solid, SDR 35 effluent distribution pipe that should be sloped at 2% minimum to the distribution box and then to the drain field. 2. We recommend solid SDR 35 be used for the distribution pipes. The distribution pipes should be sloped at 2% minimum to the drain field from the distribution box. 3. We recommend perforated SDR 35 be used for the lateral pipes. The lateral pipes should be attached close to the chamber dome with an all-weather plastic pipe strap at every chamber connection. 4. The effluent distribution 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 2.5-inches in diameter to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and damage piping. 5. A minimum of 24-inches of cover soil should be provided over the effluent piping. Paved areas, patios, or other areas without vegetative cover may be more susceptible to frost. We recommend a minimum of 48 inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with 2-inch think blue foam insulation board. If adequate soil cover is not possible, we should be contacted for re-evaluation prior to construction. 6. The effluent pipe should be double encased with larger diameter Schedule 40 PVC pipe underneath driveway surfaces and be provided with a minimum of 48 inches of soil cover and be insulated on top and sides with 2-inch-thick foam insulation board. 7. All 90-degree bends should be installed using a 90-degree long sweep or by using two 45-degree elbows. 1335 cordillera Way Project Number: 21-1184 [6] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. SETBACKS 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 that OWTS components be surveyed by a Professional Land surveyor licensed in Colorado and verified by BEST prior to the system permitting. TABLE B – COMMON MINIMUM HORIZONTAL SETBACKS FROM OWTS COMPONENTS Wells Water Supply Line Occupied Dwelling with Basement Property Lines, or Lined Ditch Lake, Irrigation Ditch, Stream, Wetland Dry Ditch, Gulch, or Cut Bank Septic Tank Absorption Trenches 100’ 25’ 20’ 10’ 50’ 25’ 5’ Septic Tank 50’ 10’ 5’ 10’ 50’ 10’ - Building Sewer Lines 50’ 5’ 0’ 10’ 50’ 10’ - HOMEOWNER PRECAUTIONS The OWTS will require periodic inspection and maintenance to function properly. A properly designed, installed, and maintained system can greatly increase its lifespan. The level of maintenance will vary depending on the complexity of the system and water use habits of the residents. Below are some basic recommendations for the OWTS operation and maintenance. HOUSEHOLD RECOMMENDATIONS 1. Use of a kitchen garbage disposal 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 increase tank pumping frequency. 2. Water use should be monitored, and plumbing leaks fixed immediately as this may generate up to 1,000 gallons per day, which may flood the system and cause a hydraulic overload of the STA. 3. Use of high efficiency water fixtures is recommended to decrease the hydraulic load on the OWTS system. 4. Do not irrigate the area on top of or directly adjacent to the STA as this may cause a hydraulic overload of the STA. 5. Do not dispose of household waste down household drains as this may clog or damage the OWTS components. Examples of household waste includes, but is not limited to: dental floss, cotton swabs, coffee grounds, paper towels, feminine products, and many other kitchen or bath items, etc. 6. Do not dispose of household chemicals, greases, oils, paints, hot tub water, or water softener brine in household drains. A separate drywell, if feasible, may be necessary for hot tub water or water softener brine disposal. 7. Limit the use of bleach as this may harm the useful bacteria in the septic tank and STA. 8. Liquid dishwasher and clothes detergent is recommended for households using an OWTS. Clay substances used as fillers in powder detergents may result in clogging of the STA. MAINTENANCE 1. The effluent in septic tanks can freeze during extended period of non-use in cold weather. We recommend that a tank heater be installed in this system to help prevent freezing. 2. Inspect the septic tank, vault filter, distribution box, treatment system, and soil treatment area at least annually for problems or signs of failure. 3. The vault filter should be cleaned annually by spray washing solids into the first chamber of the septic tank. 1335 cordillera Way Project Number: 21-1184 [7] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. 4. 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 soil treatment area, which may shorten the life span. 5. Pumping of the septic tank should take place when the level of the sludge and scum layers combined take up 25 to 33% of the capacity of the first chamber of the tank. LIMITATIONS This study has been conducted in accordance with generally accepted engineering practices in this area for exclusive use by the client for design purposes. Copying of this report or portions of this report without the express written permission of Best Engineering Solutions and Technologies, LLC (BEST), is specifically prohibited. We make no warranty either express or implied. The conclusions and recommendations submitted in this report are based upon data obtained from the exploratory test pits at the locations indicated on Figure 2, soil texture analysis, and the proposed construction. This report may not reflect subsurface variations that occur between the explorations. The nature and extent of variations across the site may not become evident until site grading and excavations are performed. If fill, soil, rock or water conditions appear to be different from those described herein, BEST should be advised at once so that a re-evaluation of the recommendations presented in this report can be made. BEST is not responsible for liability associated with interpretation of subsurface data by others. B.E.S.T. 189 14121-118410-2 BS01537818 36 46WSS= 0.0Type 2 Sandy loam12-6 BS0730 6 43 30 27 Type 2 Sandy loam10-1 BS01545 12 15 31 53 Type 2 Loam11-8 BS0845 10 5 30 65 Type 2 LoamTABLE: 1 Page 1 of 1 Matt@BestEngineeringUSA.com  AS=Auger SampleST=Shelby TubeHD=Hand DriveC4=Pocket ValueSS=Split Spoon SampleLocations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com WSS=Water Soluble SulfatesRA=Radon Testing (pCi/L)pH = pH of soilAD=Air DriedCA=California SampleRM=Remolded SampleOR = Organic content of soilC2=Miniature CompressionC3=Pocket PenetrometerNOTE 2-Shear Strength TestsSoil DescriptionLL PIGRADATIONNOTE 3- Additional Test ResultsTT=Triaxial TestPT=ProctorAdditional Test Results (Note 3)CT=Consolidation Test% Swell and Consolidation% Sand -No. 4 +No. 200% Fines -No. 200https://bestengineeringusa.sharepoint.com/Shared Documents/Projects/21-1000 Summit Projects/2021 Archives/21-1184 1335 Cordillera Way/Calcs/[21-1184 1335TABLE 1.1SUMMARY OF LABORATORY TEST RESULTSPROJECT:LOCATION: SOURCE:PROJECT NO:Field Test Pit / Lab TestingDATE:1335 Cordillera WayEdwards, COJune 11, 2021Depth Sample Type (Note 1)ATTERBERG LIMITSPit No.BS=Bag SampleNat. Dry Density (PCF)Natural Moist. (%)NOTE 1- Sample TypeC1= Unconfined Compression% Gravel +No. 4 B.E.S.T. 21‐1184 Matt@BestEngineeringUSA.com  SITE MAP      Project Number        Figure 1Locations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com NNot to Scale B.E.S.T. 21‐1184 Matt@BestEngineeringUSA.com  Locations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com PIT LOCATION       LEGEND:  TP‐1 – Indicates approximate location of exploratory pit      Project Number        Figure 2NNot to Scale June 11, 202121-1184 1335Cordillera Way21-1184 1335 Cordillera WayEdwards, ColoradoLakewood Office:747 Sheridan Blvd, Unit 2ALakewood, CO 80214SEPTIC LAYOUTProject Location:SCALE: 124" = 1'-0"FIGURE: 5PROJECT NO:DRAWN BY: KMHREVIEWED BY: MABDATE:ProposedStructure25'ProposedStructureTP-1SEPTIC FIELDAND TANK AREACleanoutSepticTankDistributionBoxTP-2STA102'-3"28'115'-10"28'-10"Water LineProperty LineProperty Line June 11, 2021 21-1184 1335 Cordillera Way 21-1184 1335 Cordillera Way Edwards, Colorado Lakewood Office: 747 Sheridan Blvd, Unit 2A Lakewood, CO 80214 SOIL TREATMENT AREA CALCULATIONS Project Location:SCALE: Vertical: NTS Horizontal:NTS FIGURE: 6PROJECT NO: DRAWN BY: KMH REVIEWED BY: MAB DATE: OWTS SOILS TREATMENT AREA CALCULATIONS In accordance with the current Eagle County Onsite Wastewater Treatment Systems Regulations, dated August 24, 2018, the absorption area was calculated as follows: CALCULATION OF OWTS DESIGN FLOW Q = (F)(B)(N), where: Q = Design Flow F = Average flow per person per day B = Number of bedrooms N = Number of persons per bedroom F = 75 Gallons per day/Person B = 4 Bedrooms N = 2 Persons per bedroom x First 3 bedrooms + 1 Person for the additional 1 bedroom Q = 525 Gallons per day SEPTIC TANK CAPACITY Septic tank should be listed as “Accepted for use in Colorado on-site wastewater treatment systems.” Minimum tank capacity = 1,250 gallons; Minimum first compartment capacity = 625 gallons (Per Table 15.1) CALCULATION OF OWTS TREATMENT AREA Minimum soil treatment area (STA) = Q / Loam LTAR, Where: Q = 525 Gallons per day Type 2 Loam LTAR (Eagle County Table 10-1) = 0.6 Gallons/square foot/day Minimum STA = 875 square feet Adjustment factor for trenches, 1.0; for infiltrator chambers, 0.7 (Eagle County Table 10-2 and 10-3) Required STA = Min. STA x trench adjustment x infiltrator adjustment Required STA = 613 Square Feet OWTS DESIGN TREATMENT AREA Standard Chamber Trench Width 3 feet; Standard Chamber Length = 4 feet Area per Chamber = 12 SF Minimum Trench Separation = 4 feet Minimum Number of Chambers = 613/ 12 = 52 Four Trenches with 13 chambers and 52 feet long, See Figure 6. June 11, 2021 21-1184 1335 Cordillera Way 21-1184 1335 Cordillera Way Edwards, Colorado Lakewood Office: 747 Sheridan Blvd, Unit 2A Lakewood, CO 80214 SOIL TREATMENT AREA CALCULATIONS Project Location:SCALE: Vertical: NTS Horizontal:NTS FIGURE: 7PROJECT NO: DRAWN BY: KMH REVIEWED BY: MAB DATE: Inspection Ports N Min. 4 Ft Spacing between Trenches Typ. Trench Width 3 Ft Typ. SOIL TREATMENT AREA PLAN VIEW Scale 132" = 1'-0" Pipes, SDR 35 Distribution Box W/Equalizers TRENCH 1: 13 Infiltration Chambers TRENCH 2: 13 Infiltration Chambers TRENCH 3: 13 Infiltration Chambers 52' 3' 4'24' TRENCH 4: 13 Infiltration Chambers SOIL TREATMENT AREA CROSS SECTION Scale 12" = 1'-0" 12" Tall Infiltrator Chambers Min. 12" Native Soil Backfill - Do Not Compact Native Loam 1/4" Perforations spaced at 4' On-Center along bottom of pipe 4" Dia. Inspection Port Lateral Pipe Perforated SDR 35 Scarify Soil 3" Below Level & Rake Do Not Compact or Smear Trench Bottom 6" MIN 12" 12" 3' Max. Infiltration Elev. 7,928 ft SOIL TREATMENT AREA CROSS SECTION Scale 14" = 1'-0" Infiltration Elev. 7,922 ft Ground Surface Varies Lateral Pipe, Perforated SDR 35 Lateral Pipe, Perforated SDR 35 Native Loam Lateral Pipe, Perforated SDR 35 Max. 36" Min. 12"Native Loam Ground Surface Varies Infiltration Elev. 7,926 ft Lateral Pipe, Perforated SDR 35 Native Loam Infiltration Elev. 7,928 ft Infiltration Elev. 7,924 ft Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com ONSITE WASTEWATER TREATMENT SYSTEM DESIGN 1335 CORDILLERA WAY EDWARDS, COLORADO 81632 PROJECT NUMBER 21-1184 APRIL 29, 2021 REVISED MAY 7, 2021 PREPARED FOR KEDROWSKI BUILDERS BOB AND BARBARA KEDROWSKI 340 CORDILLERA WAY EDWARDS, COLORADO 81632 Prepared By: Reviewed By: Kamal M. Hasan, E.I.T. Matthew A. Best, P.E. Staff Engineer Project Engineer 5/7/2021 Matthew Best Digitally signed by Matthew Best Date: 2021.05.07 10:51:14 -06'00' 1335 cordillera Way Project Number: 21-1184 [2] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. Table of Contents PURPOSE AND SCOPE OF WORK ...................................................................................................................................................... 3 PROPOSED CONSTRUCTION.............................................................................................................................................................. 3 SITE CONDITIONS ................................................................................................................................................................................ 3 FIELD EXPLORATION ......................................................................................................................................................................... 3 SUBSURFACE CONDITIONS ............................................................................................................................................................... 3 OWTS ANALYSIS .................................................................................................................................................................................. 3 DESIGN RECOMMENDATIONS .......................................................................................................................................................... 3 SETBACKS ............................................................................................................................................................................................. 6 HOMEOWNER PRECAUTIONS ........................................................................................................................................................... 6 LIMITATIONS ........................................................................................................................................................................................ 7 FIGURE 1 –SITE MAP FIGURE 2 – LOCATIONS OF EXPLORATORY TEST PITS FIGURE 3 – TEST PITS LOGS FIGURE 4 – LEGEND AND NOTES FIGURE 5 – SEPTIC LAYOUT FIGURE 6 – SOIL TREATMENT AREA CALCULATIONS FIGURE 7 – SOIL TREATMENT AREA DETAILS 1335 cordillera Way Project Number: 21-1184 [3] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. PURPOSE AND SCOPE OF WORK This report presents the results of an onsite wastewater treatment system (OWTS) design for the project at 1335 cordillera Way in Eagle County, Colorado. The purpose of this report is to provide design details for an OWTS in accordance with the 2018 Eagle County Onsite Wastewater Treatment System Regulations. The project site is shown on Figure 1. Please refer to this report for subsurface information and recommendations. PROPOSED CONSTRUCTION We understand that the proposed residence will be a single-family home with an attached garage. The residence will have four bedrooms. The home will be conventional wood frame construction. If the number of bedrooms for the residence are different from those described above, we should be notified to re-evaluate the recommendations contained in this report. SITE CONDITIONS At the time of our field exploration, the property consisted of vacant lot. The site is bounded by residential single- family homes and undeveloped lots. The topography in the area slopes toward the north and east and is at an approximate ranging elevation of 7,870 to 7,980 feet MSL. FIELD EXPLORATION Exploratory test pits were excavated on April 20, 2021, approximately at the locations shown on Figure 2 to evaluate the soil treatment area (STA) subsurface conditions. The test pits were excavated with a mini-excavator and logged by a representative of BEST. Samples of the soils were taken with disturbed sampling methods and the depths of the samples are shown on the Test Pits Logs, Figure 3 and Legend and Notes, Figure 4. SUBSURFACE CONDITIONS TP-1 encountered native sandy loam to the maximum depth explored of 6 feet Below Existing Grade (BEG). TP-2 encountered native loam to the maximum depth explored of 8 feet BEG. The soils encountered were slightly moist to moist. Groundwater was not encountered at the time of the pits. Fluctuations in the groundwater levels may occur seasonally or with precipitation events. Samples taken from the exploratory test pits were retained for laboratory testing and inspected by the project engineer. The results of the tests performed on the field samples are shown on Table 1. Laboratory testing included index property tests, for moisture content and gradation analysis. The testing was performed on disturbed bulk samples and were in general conformance with recognized test procedures, primarily, ASTM and United States Department of Agriculture (USDA). OWTS ANALYSIS We recommend trench construction and infiltrator chambers be used to provide effluent treatment from the proposed residence. The STA was sized for a maximum of four bedrooms, Type 2 soil with a Long-term acceptance rate (LTAR) of 0.60, and TL1. Calculations are provided on Figure 6. The effluent will gravity flow to the septic tank for primary treatment and gravity flow through a distribution box with equalizers to the STA for final treatment. DESIGN RECOMMENDATIONS The design recommendations presented below are based on the proposed construction, the site, and subsurface conditions encountered and our experience in this area. If conditions encountered during construction are 1335 cordillera Way Project Number: 21-1184 [4] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. different than those that are described in this report, please contact us and we will re-evaluate our design recommendations. SOIL TREATMENT AREA 1. The treatment system will consist of four trenches, and 13 infiltration chambers long, see Table A below. The trenches shall be a maximum width of 36-inches and shall be spaced at least 48-inches from trench wall to trench wall. The STA was placed outside the former structure area which has been previously removed. 2. The chambers shall be Quick4 Plus Standard infiltrator chambers, or an approved equivalent. Chambers shall be installed in accordance with the manufacture’s recommendations and remain level across the length of each set of chambers. 3. Topsoil within the proposed STA shall be stripped and removed prior to excavation of the trenches. 4. The maximum cut for the uphill side of the excavation shall be 3 feet to the infiltration surface. The base excavation should be scarified prior to chamber placement. 5. A minimum 12 inches of cover soil should be placed over the geotextile. The soil cover may consist of native sandy loam Type 1 or 2 materials. 6. Backfill should be graded to deflect surface water away from the STA and should be sloped at 3H:1V maximum. 7. Disturbed soil should be re-vegetated as soon as possible with a native grass seed mixture. No trees, shrubs, or other plants with deep roots should be planted on or near the STA as this may damage the system. 8. Four-inch diameter inspection ports should be installed vertically into the beginning and end of each trench. The inspection ports should extend at least 8 inches above the finished ground surface or be protected in a valve box at finished grade. The portion that lies within the gravel layer should be perforated. 9. A plan view of the STA is presented on Figure 2 with a cross section view presented on Figure 5. TABLE A – TRENCH CHAMBER SCHEDULE Trench Number Number of Chambers Trench Length (ft) Anticipated Infiltration Elevation (ft) Trench 1 13 52 7,922 Trench 2 13 52 7,924 Trench 3 13 52 7,926 Trench 4 13 52 7,928 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 1. A minimum 1,250 gallon, two-chamber, precast septic tank is proposed for the OWTS. The first compartment must be at least 625 gallons. The baffle or wall between the first and second compartments must be properly sealed to prevent cross-compartment flow. 2. The tank must be set level. The bottom of the excavation shall be free of large rocks or other objects that could damage the tank during placement. A gravel or road base bedding material may be necessary to prevent tank damage during placement and act as a leveling course. 3. Tank shall be backfilled uniformly on all sides in lifts less than 24” and mechanically compacted. 4. Install tank with 2 feet minimum cover soil for frost protection. Maximum soils cover depth is 4 feet. 1335 cordillera Way Project Number: 21-1184 [5] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. 5. The septic lids must extend to final surface grade and made to be easily located. 6. An effluent filter shall be located prior to exiting the tank. The effluent filter shall be provided with a handle located within 12-inches of the tank lid to allow for removal and cleaning of the screen. SEWER PIPE 1. The sewer line from the residence to the septic tank should not be less than the diameter of the building drain and not less than 4 inches in diameter. 2. Install cleanout pipes within 5 feet of the building foundations and if necessary, where the sewer pipe bends 90 degrees or more and every 100 feet of sewer pipe. 3. The sewer pipe should have a rating of SDR35 or better. The sewer pipe should be sloped between 2% and 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 necessary, this can be accomplished with vertical step-downs in the sewer line, prior to the last 5 feet the tank. 4. A minimum of 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. We recommend a minimum of 48 inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with 2- inch think blue foam insulation board. If adequate soil cover is not possible, we should be contacted for re-evaluation prior to construction. If the sewer pipe passes under a paved area the pipe shall be SDR 35. 5. 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 that 2.5-inches in diameter to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and damage piping. 6. All 90-degree bends should be installed using a 90-degree long sweep or by using two 45-degree elbows. 7. The sewer line location shown on Figure 2 is considered conceptual. We assume that there will be only one sewer line exiting the residence. It is the responsibility of the owner to locate all sewer line exit locations and connections to the septic tank. We should be notified if there are other sewer lines exiting the residences. EFFLUENT PIPING 1. We recommend a 3.0-inch diameter, solid, SDR 35 effluent distribution pipe that should be sloped at 2% minimum to the distribution box and then to the drain field. 2. We recommend solid SDR 35 be used for the distribution pipes. The distribution pipes should be sloped at 2% minimum to the drain field from the distribution box. 3. We recommend perforated SDR 35 be used for the lateral pipes. The lateral pipes should be attached close to the chamber dome with an all-weather plastic pipe strap at every chamber connection. 4. The effluent distribution 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 2.5-inches in diameter to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and damage piping. 5. A minimum of 24-inches of cover soil should be provided over the effluent piping. Paved areas, patios, or other areas without vegetative cover may be more susceptible to frost. We recommend a minimum of 48 inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with 2-inch think blue foam insulation board. If adequate soil cover is not possible, we should be contacted for re-evaluation prior to construction. 6. The effluent pipe should be double encased with larger diameter Schedule 40 PVC pipe underneath driveway surfaces and be provided with a minimum of 48 inches of soil cover and be insulated on top and sides with 2-inch-thick foam insulation board. 7. All 90-degree bends should be installed using a 90-degree long sweep or by using two 45-degree elbows. 1335 cordillera Way Project Number: 21-1184 [6] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. SETBACKS 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 that OWTS components be surveyed by a Professional Land surveyor licensed in Colorado and verified by BEST prior to the system permitting. TABLE B – COMMON MINIMUM HORIZONTAL SETBACKS FROM OWTS COMPONENTS Wells Water Supply Line Occupied Dwelling with Basement Property Lines, or Lined Ditch Lake, Irrigation Ditch, Stream, Wetland Dry Ditch, Gulch, or Cut Bank Septic Tank Absorption Trenches 100’ 25’ 20’ 10’ 50’ 25’ 5’ Septic Tank 50’ 10’ 5’ 10’ 50’ 10’ - Building Sewer Lines 50’ 5’ 0’ 10’ 50’ 10’ - HOMEOWNER PRECAUTIONS The OWTS will require periodic inspection and maintenance to function properly. A properly designed, installed, and maintained system can greatly increase its lifespan. The level of maintenance will vary depending on the complexity of the system and water use habits of the residents. Below are some basic recommendations for the OWTS operation and maintenance. HOUSEHOLD RECOMMENDATIONS 1. Use of a kitchen garbage disposal 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 increase tank pumping frequency. 2. Water use should be monitored, and plumbing leaks fixed immediately as this may generate up to 1,000 gallons per day, which may flood the system and cause a hydraulic overload of the STA. 3. Use of high efficiency water fixtures is recommended to decrease the hydraulic load on the OWTS system. 4. Do not irrigate the area on top of or directly adjacent to the STA as this may cause a hydraulic overload of the STA. 5. Do not dispose of household waste down household drains as this may clog or damage the OWTS components. Examples of household waste includes, but is not limited to: dental floss, cotton swabs, coffee grounds, paper towels, feminine products, and many other kitchen or bath items, etc. 6. Do not dispose of household chemicals, greases, oils, paints, hot tub water, or water softener brine in household drains. A separate drywell, if feasible, may be necessary for hot tub water or water softener brine disposal. 7. Limit the use of bleach as this may harm the useful bacteria in the septic tank and STA. 8. Liquid dishwasher and clothes detergent is recommended for households using an OWTS. Clay substances used as fillers in powder detergents may result in clogging of the STA. MAINTENANCE 1. The effluent in septic tanks can freeze during extended period of non-use in cold weather. We recommend that a tank heater be installed in this system to help prevent freezing. 2. Inspect the septic tank, vault filter, distribution box, treatment system, and soil treatment area at least annually for problems or signs of failure. 3. The vault filter should be cleaned annually by spray washing solids into the first chamber of the septic tank. 1335 cordillera Way Project Number: 21-1184 [7] Locations: Summit County & Lakewood, Colorado  Psalm 20  Phone: 970.409.9670  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A  Lakewood, Colorado 80211 Phone: 303.238.1770  Office@BestEngineeringUSA.com B.E.S.T. 4. 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 soil treatment area, which may shorten the life span. 5. Pumping of the septic tank should take place when the level of the sludge and scum layers combined take up 25 to 33% of the capacity of the first chamber of the tank. LIMITATIONS This study has been conducted in accordance with generally accepted engineering practices in this area for exclusive use by the client for design purposes. Copying of this report or portions of this report without the express written permission of Best Engineering Solutions and Technologies, LLC (BEST), is specifically prohibited. We make no warranty either express or implied. The conclusions and recommendations submitted in this report are based upon data obtained from the exploratory test pits at the locations indicated on Figure 2, soil texture analysis, and the proposed construction. This report may not reflect subsurface variations that occur between the explorations. The nature and extent of variations across the site may not become evident until site grading and excavations are performed. If fill, soil, rock or water conditions appear to be different from those described herein, BEST should be advised at once so that a re-evaluation of the recommendations presented in this report can be made. BEST is not responsible for liability associated with interpretation of subsurface data by others. B.E.S.T. 175 12721-118410-2 BS01537818 36 46WSS= 0.0Type 2 Sandy loam12-6 BS0730 6 43 30 27 Type 2 Sandy loam10-1 BS01545 12 15 31 53 Type 2 Loam11-8 BS0845 10 5 30 65 Type 2 LoamTABLE: 1 Page 1 of 1 Matt@BestEngineeringUSA.com  Depth Sample Type (Note 1)ATTERBERG LIMITSPit No.BS=Bag SampleNat. Dry Density (PCF)Natural Moist. (%)NOTE 1- Sample TypeC1= Unconfined Compressionhttps://bestengineeringusa.sharepoint.com/Shared Documents/Projects/21-1000 Summit Projects/21-1184 1335 Cordillera Way/Calcs/[21-1184 1335 Cordillera WayTABLE 1.1SUMMARY OF LABORATORY TEST RESULTSPROJECT:LOCATION: SOURCE:PROJECT NO:Field Test Pit / Lab TestingDATE:1335 Cordillera WayEdwards, COMay 7, 2021% Gravel +No. 4Additional Test Results (Note 3)CT=Consolidation Test% Swell and Consolidation% Sand -No. 4 +No. 200% Fines -No. 200C2=Miniature CompressionC3=Pocket PenetrometerNOTE 2-Shear Strength TestsSoil DescriptionLL PIGRADATIONNOTE 3- Additional Test ResultsTT=Triaxial TestPT=ProctorWSS=Water Soluble SulfatesRA=Radon Testing (pCi/L)pH = pH of soilAD=Air DriedCA=California SampleRM=Remolded SampleOR = Organic content of soilSS=Split Spoon SampleLocations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com AS=Auger SampleST=Shelby TubeHD=Hand DriveC4=Pocket Value B.E.S.T. 21‐1184 Matt@BestEngineeringUSA.com  SITE MAP      Project Number        Figure 1Locations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com NNot to Scale B.E.S.T. 21‐1184 Matt@BestEngineeringUSA.com        Project Number        Figure 2Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com PIT LOCATION       LEGEND:  TP‐1 – Indicates approximate location of exploratory pitLocations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●NNot to Scale May 7, 202121-1184 1335Cordillera Way21-1184 1335 Cordillera WayEdwards, ColoradoLakewood Office:747 Sheridan Blvd, Unit 2ALakewood, CO 80214SEPTIC LAYOUTProject Location:SCALE: 132" = 1'-0"FIGURE: 5PROJECT NO:DRAWN BY: KMHREVIEWED BY: MABDATE:ProposedStructureTP-1SEPTIC FIELDAND TANK AREACleanoutSepticTankDistributionBoxTP-2STANProposedStructure25' May 7, 2021 21-1184 1335 Cordillera Way 21-1184 1335 Cordillera Way Edwards, Colorado Lakewood Office: 747 Sheridan Blvd, Unit 2A Lakewood, CO 80214 SOIL TREATMENT AREA CALCULATIONS Project Location:SCALE: Vertical: NTS Horizontal:NTS FIGURE: 6PROJECT NO: DRAWN BY: KMH REVIEWED BY: MAB DATE: OWTS SOILS TREATMENT AREA CALCULATIONS In accordance with the current Eagle County Onsite Wastewater Treatment Systems Regulations, dated August 24, 2018, the absorption area was calculated as follows: CALCULATION OF OWTS DESIGN FLOW Q = (F)(B)(N), where: Q = Design Flow F = Average flow per person per day B = Number of bedrooms N = Number of persons per bedroom F = 75 Gallons per day/Person B = 4 Bedrooms N = 2 Persons per bedroom x First 3 bedrooms + 1 Person for the additional 1 bedroom Q = 525 Gallons per day SEPTIC TANK CAPACITY Septic tank should be listed as “Accepted for use in Colorado on-site wastewater treatment systems.” Minimum tank capacity = 1,250 gallons; Minimum first compartment capacity = 625 gallons (Per Table 15.1) CALCULATION OF OWTS TREATMENT AREA Minimum soil treatment area (STA) = Q / Loam LTAR, Where: Q = 525 Gallons per day Type 2 Loam LTAR (Eagle County Table 10-1) = 0.6 Gallons/square foot/day Minimum STA = 875 square feet Adjustment factor for trenches, 1.0; for infiltrator chambers, 0.7 (Eagle County Table 10-2 and 10-3) Required STA = Min. STA x trench adjustment x infiltrator adjustment Required STA = 613 Square Feet OWTS DESIGN TREATMENT AREA Standard Chamber Trench Width 3 feet; Standard Chamber Length = 4 feet Area per Chamber = 12 SF Minimum Trench Separation = 4 feet Minimum Number of Chambers = 613/ 12 = 52 Four Trenches with 13 chambers and 52 feet long, See Figure 6. May 7, 2021 21-1184 1335 Cordillera Way 21-1184 1335 Cordillera Way Edwards, Colorado Lakewood Office: 747 Sheridan Blvd, Unit 2A Lakewood, CO 80214 SOIL TREATMENT AREA CALCULATIONS Project Location:SCALE: Vertical: NTS Horizontal:NTS FIGURE: 7PROJECT NO: DRAWN BY: KMH REVIEWED BY: MAB DATE: N Min. 4 Ft Spacing between Trenches Typ. Trench Width 3 Ft Typ. SOIL TREATMENT AREA PLAN VIEW Scale 132" = 1'-0" Pipes, SDR 35 Distribution Box W/Equalizers TRENCH 1: 13 Infiltration Chambers TRENCH 2: 13 Infiltration Chambers TRENCH 3: 13 Infiltration Chambers 52' 3' 4'24' TRENCH 4: 13 Infiltration Chambers SOIL TREATMENT AREA CROSS SECTION Scale 12" = 1'-0" 12" Tall Infiltrator Chambers Min. 12" Native Soil Backfill - Do Not Compact Native Loam 1/4" Perforations spaced at 4' On-Center along bottom of pipe 4" Dia. Inspection Port Lateral Pipe Perforated SDR 35 Scarify Soil 3" Below Level & Rake Do Not Compact or Smear Trench Bottom 6" MIN 12" 12" 3' Max. Infiltration Elev. 7,928 ft SOIL TREATMENT AREA CROSS SECTION Scale 14" = 1'-0" Infiltration Elev. 7,922 ft Ground Surface Varies Lateral Pipe, Perforated SDR 35 Lateral Pipe, Perforated SDR 35 Native Loam Lateral Pipe, Perforated SDR 35 Max. 36" Min. 12"Native Loam Ground Surface Varies Infiltration Elev. 7,926 ft Lateral Pipe, Perforated SDR 35 Native Loam Infiltration Elev. 7,928 ft Infiltration Elev. 7,924 ft 11/9/23, 7:05 AM 20220507_095439.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 11/9/23, 7:05 AM 20220515_120956.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 11/9/23, 7:05 AM 20220515_121010.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 11/9/23, 7:05 AM 20221019_115634.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 11/9/23, 7:05 AM IMG_1234.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 11/9/23, 7:05 AM IMG_1393.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1