HomeMy WebLinkAbout850 Cordillera Wy - 210712203022Environmental Health Department P.O. Box 179 500 Broadway Eagle, CO 81631-0179 Phone: (970) 328-8730 Fax: (970) 328-7185 Permit Permit No. OWTS-020695-2021 Permit Type: OWTS Permit Work Classification: New Permit Status: Active Issue Date: 4/15/2021 Expires: 8/13/2021 On-Site Wastewater Treatement System Project Address Parcel Number 850 CORDILLERA WY, EDWARDS AREA,210712203022 Owner Information Address Joe Menendez Phone: Cell: (443) 621-6768 Email: Inspections: For Inspections Call: (970) 328-8755 and call the Design Engineer Engineer Phone Email Best Engineering Solutions and Technologies, Matthew Best (970) 409-9670 matt@bestengineeringusa .com Contractor License Number Phone Email Blue Monster Service bluemonsterservice@gmai l.com (970) 390-1898 Contractor License Number Phone Email Slopeside Construction Inc.mike.dantas67@gmail.co m (970) 376-5444 Permitted Construction / Details: This system is designed to serve a new single-family residence. Install the new system exactly as depicted in the Best Engineering Solutions and Technologies design, dated and stamped November 24th, 2020 by Matthew A. Best, P.E.. This system is designed to accommodate the maximum daily flows for a 5 bedroom residence. This OWTS consists of one sewer line from the residence. A 1,500 gallon, two-compartment, precast septic tank with an effluent filter in the outlet tee shall be used. The tank chosen must be on the CDPHE Water Quality Control Department approved tank list (attached). A distribution box equipped with flow equalizers will be accessible at grade. The STA consists of 3 shallow trenches of 20 Infiltrator Quick4 Plus Standard chambers for a total of 60. 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 April 15, 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, April 15, 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: ___________ Receipt #: ___________ Check #: ___________ Date: ______________ DEPARTMENT OF ENVIRONMENTAL HEALTH (970) 328-8755 FAX: (970) 328-8788 TOLL FREE: 800-225-6136 www.eaglecounty.us P.O. Box 179 500 Broadway Eagle, CO 81631 environment@eaglecounty.us Joe Menendez 443-621-6768 Best Engineering Solutions and Technologies 303-238-1770 970-376-5444 2107-122-03-022 850 Cordillera Wy Subdivision: CORDILLERA SUB FIL 1 & 2 PO Box 369, Edwards, CO 81632 joemenendez58@gmail.com 3.516 970-620-1631 gonzalez_mata@hotmail.com Blue Monster Service LLC PO Box 407, Gypsum, CO 81637 Eagle River Water & Sanitation District Mike Dantas/Slopeside Construction Inc OWTSPL-000018-2019 INSPECTION WORKSHEET (EDWARDS AREA - 850 CORDILLERA - 512921) FOR EAGLE COUNTY GOVERNMENT OWTS-020695-2021Case Number:Case Module:Permit Management 12/21/2021 ApprovedInspection Status:Inspection Date: OWTS Final InspectionInspection Type:Inspector: Job Address:Parcel Number:850 Cordillera Wy Edwards Area, CO 210712203022 Company Name NameContact Type Contractor Blue Monster Service Jose Gonzalez Slopeside Construction Inc.Mike Dantas Engineer Best Engineering Solutions and TechnologiesMatthew Best Owner Joe Menendez CommentsPassedChecklist Item True A 1500 gallon two compartment concrete septic tank from Front Range Precast Concrete was used. Septic Tank - Septic Tank True Received 1/14/2022 from BEST Engineering.Record Drawing - Record Drawing True Received 2/11/2022 from BEST Engineering.Record Photos - Record Photos True Received 3/8/2021 from BEST Engineering.Site and Soil - Site & Soil True Received 2/11/2022 from BEST Engineering.Final Certification Letter - Final Certification Letter True Received 3/8/2021 from BEST Engineering.General Plan - General Plan True Originally Due to the soil conditions, trenches 1 and 2 contained 19 chambers and trench 3 contained 22 chambers. Soil Treatment Area (STA) - Soil Treatment Area (STA) True Blue Monster was the licensed installer for this project.Identification of Systems Contractor - Identification of Systems Contractor February 15, 2022 Page 1 of 1P.O. Box 179, 500 Broadway, Eagle, CO 81631-0179 Locations: Summit County & Lakewood, Colorado  Psalm 20  Matt@BestEngineeringUSA.com Mailing: 747 Sheridan Boulevard, Unit 2A, Lakewood, Colorado 80214  Phone: 303.238.1770  Office@BestEngineeringUSA.com January 14, 2022 Mike Dantas 2121 North Frontage Road West, PMB 206 Vail, Colorado 81657 Subject: Septic Installation Observation 850 Cordillera Way Edwards, Colorado 81632 Project No. 20-1248 At your request, Best Engineering Solutions and Technologies, LLC (BEST) reviewed the drawings and pictures of the subject site in December 2021 to provide observations during installation of the onsite wastewater treatment system. We used information from our Onsite Wastewater Treatment System Design report, dated November 24, 2020, and revised April 13, 2021, project number 20-1248. 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. 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. Principal Engineer 1/14/22 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 850 CORDILLERA WAY EDWARDS, COLORADO 81632 PROJECT NUMBER 20-1248 NOVEMBER 24, 2020 REVISED APRIL 15, 2021 PREPARED FOR SLOPESIDE CONSTRUCTION INC. MIKE DANTAS 2121 N FRONTAGE ROAD W, PMB 206 VAIL, COLORADO 81657 Prepared By: Reviewed By: Kamal M. Hasan, E.I.T. Thomas J. Krasovec, P.E. Staff Engineer Engineering Manager 4/15/2021 Thomas Krasovec Digitally signed by Thomas Krasovec Date: 2021.04.15 09:25:23 -06'00' 850 cordillera Way Project Number: 20-1248 [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 850 cordillera Way Project Number: 20-1248 [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 850 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 five 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 7,610 to 7,645 feet MSL. FIELD EXPLORATION Exploratory test pits were excavated on September 18, 2020 and March 11, 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 was encountered to an approximate depth of 4 foot Below Existing Grade (BEG). TP-2 & TP-3 encountered native silty loam was encountered to an approximate depth of 7 foot 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 five 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 850 cordillera Way Project Number: 20-1248 [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 three trenches, and 20 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 (North to South) Number of Chambers Trench Length (ft) Anticipated Infiltration Elevation (ft) Trench 1 20 80 7,785 Trench 2 20 80 7,785 Trench 3 20 80 7,785 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 1,500 gallon, two-chamber, precast septic tank is proposed for the OWTS. The first compartment must be at least 750 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. 5. The septic lids must extend to final surface grade and made to be easily located. 850 cordillera Way Project Number: 20-1248 [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. 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. 850 cordillera Way Project Number: 20-1248 [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. 850 cordillera Way Project Number: 20-1248 [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. 174 12620-1248TP-1 1.5-5 BS011 46 Type 2 Sandy LoamTP-2 0-2.5 BS0831 12 78 Type 2 Silty LoamTP-2 2.5-7 BS0633 12 4 17 79 Type 2 Silty LoamTP-3 0-3 BS0829 7 21 79 Type 2 Silty LoamTP-3 3-7 BS0933 17 20 80 Type 2 Silty 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 soil% 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=Proctorhttps://bestengineeringusa.sharepoint.com/Shared Documents/Projects/20-1000 Summit Projects/20-1248 850 Cordillera Way/Calcs/[20-1248 850 Cordillera WayTABLE 1.1SUMMARY OF LABORATORY TEST RESULTSPROJECT:LOCATION: SOURCE:PROJECT NO:Field Test Pit / Lab TestingDATE:850 Cordillera Way Edwards, COApril 15, 2021Depth (ft)Sample Type (Note 1)ATTERBERG LIMITSTest Pit No.BS=Bag SampleNat. Dry Density (PCF)Natural Moist. (%)NOTE 1- Sample TypeC1= Unconfined Compression B.E.S.T. 20‐1248 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. 20‐1248 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 TEST PIT LOCATIONS       LEGEND:  TP‐1 – Indicates approximate location of exploratory pit      Project Number        Figure 2NNot to Scale April 15, 202120-1248 850 CordilleraWay.dwg20-1248 850 Cordillera WayEdwards, ColoradoLakewood Office:747 Sheridan Blvd, Unit 2ALakewood, CO 80214SEPTIC LAYOUTProject Location:SCALE: 132" = 1'-0"FIGURE: 5APROJECT NO:DRAWN BY: KMHREVIEWED BY: TJKDATE:COVEREDDINING SLOPE8:12SLOPE8:12SLOPE3:12HOTTUBWATER WALLSLOPE8:12FIREPIT SLOPE8:1220'@6%96'95.6'45'@8%94'92'33'@6%90'89.5'88'89'88'18'@3%88'89.5'89'89.5'90'77987796779477927790778877867790778877807782778677847788ASPHALTDRIVESTAMPEDCONCRETELAWN AREAASPHALTDRIVE+89GUEST DROP OFFENTRYCONTROLPOINT+89SIGN+85.5+85PRIVATE PATIOACCESS PANELPREVIOUSHOUSELOCATIONPREVIOUS HOUSELOCATIONPREVIOUSHOUSELOCATIONPREVIOUS HOUSELOCATIONSLOPE3:12SLOPE3:12SLOPE3:12SLOPE8:12SLOPE8:12SLOPE8:12SLOPE8:12778477827780N35°45'CleanoutSepticTankDistributionBoxSTATP-2TP-3TP-1 April 15, 202120-1248 850 CordilleraWay.dwg20-1248 850 Cordillera WayEdwards, ColoradoLakewood Office:747 Sheridan Blvd, Unit 2ALakewood, CO 80214SEPTIC LAYOUTProject Location:SCALE: 164" = 1'-0"FIGURE: 5BPROJECT NO:DRAWN BY: KMHREVIEWED BY: TJKDATE:1297798.090gb20.000lc1307798.440gb30.000lc1317798.674si40.000lc1327799.008et.67800.01850.000lc7799.1887799.8497799.2231377795.710gb1387794.975gb1397792.005gb1407790.851gb120.000lc1417789.920gb130.000lc1427789.544gb140.000lc150.000lc987795.278fac1017799.896eoa1027799.050eoa1037798.406eoa1047797.626eoa1057796.990eoa1067796.140eoa1077795.655eoa977795.001bm wmh1087794.923eoa1097794.735eoa1107794.400eoa1117794.033eoa1127793.596eoa1137793.278eoa1147793.450wv1157793.330wv1167793.433wmk1177792.599gb1187793.225gb1197793.423gb1207793.965gb1217794.729gb1227795.336gb1237795.517gb1247796.149gb1257796.649gb1267797.579dt1.01277797.580dt1.01287797.369gb1437788.830gb1447788.277gb1457788.271et.51467787.293gb1477786.627gb1487784.938gb1497783.515gb1507783.938et.51517783.392e trans1537783.288e trans1547783.021pped1557782.780em1567778.251g1577779.786g1587781.069g1597787.622et.51607786.662et.51617788.487et.51627786.545g957784.685fac20695967786.158g1637787.182g1647788.334g1657790.221g1667789.720g1677788.903g1687787.681g1697789.645g1707790.457et.41717790.445et.41727791.264et.41737790.139et.41747789.923et.81757789.756et.81767788.566et.81777788.631et.51787788.463et.51797786.938et.51807786.937g1817786.796g1827786.992g1837786.999g1847785.986g189g190g1917792.271et1.01927791.190g1937790.076si1947789.138post1957789.505g1967787.079g1977783.013g1987786.315g1997782.670g2007768.762g2017781.403g2027775.602g2037770.157g2047765.940g2057770.858g2067770.855g2077763.809g2087766.048g2097773.797g2107778.301g2117779.549g2127778.587g2137781.625g2147779.972g2157773.572g2167768.740g2177769.175g2187768.832g2197774.285g2207780.084g7783.8597787.5877787.8092247788.176et.72257788.856et.72267787.872g2277787.665g2287788.260g2297788.759g7789.1087789.5142327790.730g7788.6707785.6777784.4347786.9597786.4117786.7547786.9707787.4297787.5247786.7907784.8497784.2997783.1677782.8412477784.510g2487783.859g2497783.052g7782.9332517777.853g2527778.842g2537777.312g7781.4267782.5207781.7072587778.152g2597774.174g2607770.773g2617767.106g2627769.755g2637767.704g2647773.704g20'@4%95.6'20'@6%96.8'45'@8%7790779277947796779894'90'77887786778877907788 7786 7784 7782 7780 92'89.5'90'90'18'@3%33'@6%96'89'LAWN AREACOVEREDDININGHOTTUBWATER WALL PRIVATE PATIOFIREPIT ACCESS PANELSIGN+89+89+85.5+8589.5'89'88'88'88'89.5'GUEST DROP OFFENTRYSTAMPEDCONCRETEASPHALTDRIVEASPHALTDRIVESLOPE3:12SLOPE3:12 SLOPE3:12SLOPE3:12SLOPE3:12 SLOPE3:12SLOPE8:12SLOPE8:12 SLOPE8:12SLOPE8:12SLOPE3:12 SLOPE8:12SLOPE8:12SLOPE8:12SLOPE8:12 TYPICAL CLEANOUT3"Ø SDR35 SEWER PIPE22 FEET @2 - 4% SLOPE1500 GALLON TWOCHAMBER CONCRETESEPTIC TANKDISTRIBUTION BOX, TUF-TITED BOX WITH SPEED LEVELERSOR APPROVED EQUIVALENTINFILTRATOR CHAMBERS3' X 4' X 12" - QUICK4 PLUS4'4'PROPERTY LINE45'PROPERTY LINE 7'27'NOTES:1.NO KNOW EASEMENTS WERE IDENTIFIED ON THE SITE.2.NO WETLANDS WERE NOTED ON THE SITE.3.THE STA WILL BE AT LEAST 45' FROM PROPERTY BOUNDARIES.4.NO WELLS ARE PRESENT ON SITE AS THERE IS PUBLIC WATER SERVICE AVAILABLE.WATER LINES ARE MORE THAN 60 FEET FROM THE OWTS.5.NO SURFACE WATER HAS BEEN IDENTIFIED IN OR AROUND THE SITE PROPERTY LINE.6.REGULATIONS REGARDING SEPTIC TANKS THEIR TIGHTNESS AND CONNECTIONS ARENOTED IN THE REPORT AS THEY RELATE TO EAGLE COUNTY REGULATIONS AND STATEOF COLORADO DEPARTMENT OF HEALTH AND ENVIRONMENT REGULATIONS BY REFERENCE.7.CLEAN-OUT LOCATIONS ARE AS NOTED ON THIS FIGURE.8.STA INSPECTION PORTS ARE AS NOTED ON THE ATTACHED DETAIL FIGURE.9.NO LIMITING LAYER WAS IDENTIFIED IN THE TEST PITS EXCAVATED IN THE STA AREA.10.SITE CONTOURS ARE SHOWN ON THIS FIGURE AND PREVIOUSLY SUBMITTED SITE PLANS.11.A FINISHED FLOOR ELEVATION OF 100 WAS USED TO ASSESS ANTICIPATED INVERT ELEVATIONFOR THE SEWER PIPE TO THE SEPTIC TANK OF APPROXIMATELY 98'.12.THE DISTANCE THE HOUSE AND THE SEPTIC TANK IS AT LEAST 7 FEE FROM THE HOUSE TOTHE STA IS 27 FEET.13.ANTICIPATED INFILTRATION ELEVATIONS ARE SHOWN IN TABLE A BUT WILL NOT EXCEED 3FEET FROM EXISTING GRADES April 15, 2021 20-1248 850 Cordillera Way.dwg 20-1248 850 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: TJK 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: 20 Infiltration Chambers TRENCH 2: 20 Infiltration Chambers TRENCH 3: 20 Infiltration Chambers 80' 3' 4' 17' Trenches SOIL TREATMENT AREA CROSS SECTION Scale 12" = 1'-0" 12" Tall Infiltrator Chambers Min. 12" Native Soil Backfill - Do Not Compact Native Silt 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. 7,785 ft Trenches SOIL TREATMENT AREA CROSS SECTION Scale 3 8" = 1'-0" Infiltration Elev. 7,785 ft Ground Surface Varies Lateral Pipe, Perforated SDR 35 Lateral Pipe, Perforated SDR 35 Native Silt Loam Lateral Pipe, Perforated SDR 35 Max. 36" Min. 12" Native Silt Loam Native Silt Loam Ground Surface Varies Infiltration Elev. 7,785 ft April 15, 2021 20-1248 850 Cordillera Way.dwg 20-1248 850 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: TJK 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 = Design flow per person per day B = Number of bedrooms N = Number of persons per bedroom F = 75 Gallons per day B = 5 Bedrooms N = 2 Persons per bedroom Q = 600 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 = 1,500 gallons; Minimum first compartment capacity = 750 gallons (Per Table 9-1) CALCULATION OF OWTS TREATMENT AREA Minimum soil treatment area (STA) = Q / Sandy Loam LTAR, Where: Q = 600 Gallons per day Type 2 Sandy Loam LTAR (Eagle County Table 10-1) = 0.60 Gallons/square foot/day Minimum STA = 1,000 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 = 700 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 = 700/ 12 = 59 Three Trenches with 20 chambers and 80 feet long, See Figure 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 ONSITE WASTEWATER TREATMENT SYSTEM DESIGN 850 CORDILLERA WAY EDWARDS, COLORADO 81632 PROJECT NUMBER 20-1248 NOVEMBER 24, 2020 REVISED APRIL 13, 2021 PREPARED FOR SLOPESIDE CONSTRUCTION INC. MIKE DANTAS 2121 N FRONTAGE ROAD W, PMB 206 VAIL, COLORADO 81657 Prepared By: Reviewed By: Kamal M. Hasan, E.I.T. Thomas J. Krasovec, P.E. Staff Engineer Engineering Manager 4/13/2021 Thomas Krasovec Digitally signed by Thomas Krasovec Date: 2021.04.13 11:16:08 -06'00' 850 cordillera Way Project Number: 20-1248 [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 ............................................................................................................................................................................................. 5 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 850 cordillera Way Project Number: 20-1248 [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 850 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 five 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 7,610 to 7,645 feet MSL. FIELD EXPLORATION An exploratory test pits were excavated on September 18, 2020 and March 11, 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 was encountered to an approximate depth of 4 foot Below Existing Grade (BEG). TP-2 & TP-3 encountered native silty loam was encountered to an approximate depth of 7 foot 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 three 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 shall flow 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 different than those that are described in this report, please contact us and we will re-evaluate our design recommendations. 850 cordillera Way Project Number: 20-1248 [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. SOIL TREATMENT AREA 1. The treatment system will consist three trenches, and 20 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. 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. 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 4 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 (North to South) Number of Chambers Trench Length (ft) Infiltration Elevation (ft) Trench 1 20 80 7,786.0 Trench 2 20 80 7,786.0 Trench 3 20 80 7,786.5 OWTS COMPONENTS Recommended OWTS components provided below are based on our design details and our experience with the specific component manufacturers. Equivalent components may be feasible but need to be approved by us prior to construction. SEPTIC TANK 1. A minimum 1,500 gallon, two-chamber, precast septic tank is proposed for the OWTS. The first compartment must be at least 750 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. 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. 850 cordillera Way Project Number: 20-1248 [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. 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 drain to the Manifold. 2. We recommend solid SDR 35 be used for the Manifold pipes. The Manifold pipes should be sloped at 2% minimum to drain from the Manifold. 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 and Manifold 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 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. 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. 850 cordillera Way Project Number: 20-1248 [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. 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, pump vault filter, treatment system, and soil treatment area at least annually for problems or signs of failure. 3. The pump vault filter should be cleaned annually by spray washing solids into the first chamber of the septic tank. 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. 850 cordillera Way Project Number: 20-1248 [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. 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. 174 12620-1248TP-1 1.5-5 BS011 46 Type 2 Sandy LoamTP-2 0-2.5 BS0831 12 78 Type 2 Silty LoamTP-2 2.5-7 BS0633 12 4 17 79 Type 2 Silty LoamTP-3 0-3 BS0829 7 21 79 Type 2 Silty LoamTP-3 3-7 BS0933 17 20 80 Type 2 Silty LoamTABLE: 1 Page 1 of 1 Matt@BestEngineeringUSA.com  Depth (ft)Sample Type (Note 1)ATTERBERG LIMITSTest Pit No.BS=Bag SampleNat. Dry Density (PCF)Natural Moist. (%)NOTE 1- Sample Typehttps://bestengineeringusa.sharepoint.com/Shared Documents/Projects/20-1000 Summit Projects/20-1248 850 Cordillera Way/Calcs/[20-1248 850 Cordillera WayTABLE 1.1SUMMARY OF LABORATORY TEST RESULTSPROJECT:LOCATION: SOURCE:PROJECT NO:Field Test Pit / Lab TestingDATE:850 Cordillera Way Edwards, COApril 13, 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 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 AD=Air DriedC1= Unconfined CompressionCA=California SampleRM=Remolded SampleOR = Organic content of soilAS=Auger SampleST=Shelby TubeHD=Hand DriveC4=Pocket Value B.E.S.T. 20‐1248 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. 20‐1248 Matt@BestEngineeringUSA.com        Project Number        Figure 2Locations: 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 TEST PIT LOCATIONS       LEGEND:  TP‐1 – Indicates approximate location of exploratory pitNNot to Scale April 13, 202120-1248 850 CordilleraWay Septic.dwg20-1248 850 Cordillera Way SepticEdwards, ColoradoLakewood Office:747 Sheridan Blvd, Unit 2ALakewood, CO 80214SEPTIC LAYOUTProject Location:SCALE: 132" = 1'-0"FIGURE: 5APROJECT NO:DRAWN BY: KMHREVIEWED BY: TJKDATE:COVEREDDINING SLOPE8:12SLOPE8:12SLOPE3:12HOTTUBWATER WALLSLOPE8:12FIREPIT SLOPE8:1220'@6%96'95.6'45'@8%94'92'33'@6%90'89.5'88'89'88'18'@3%88'89.5'89'89.5'90'77987796779477927790778877867790778877807782778677847788ASPHALTDRIVESTAMPEDCONCRETELAWN AREAASPHALTDRIVE+89GUEST DROP OFFENTRYCONTROLPOINT+89SIGN+85.5+85PRIVATE PATIOACCESS PANELPREVIOUSHOUSELOCATIONPREVIOUS HOUSELOCATIONPREVIOUSHOUSELOCATIONPREVIOUS HOUSELOCATIONSLOPE3:12SLOPE3:12SLOPE3:12SLOPE8:12SLOPE8:12SLOPE8:12SLOPE8:12778477827780N35°45'CleanoutSepticTankDistributionValveSTATP-2TP-3TP-1 April 13, 202120-1248 850 CordilleraWay Septic.dwg20-1248 850 Cordillera Way SepticEdwards, ColoradoLakewood Office:747 Sheridan Blvd, Unit 2ALakewood, CO 80214SEPTIC LAYOUTProject Location:SCALE: 164" = 1'-0"FIGURE: 5BPROJECT NO:DRAWN BY: KMHREVIEWED BY: TJKDATE:10.000lc1297798.090gb20.000lc1307798.440gb30.000lcsi40.000lc1327799.008et.61377795.710gb1387794.975gb1397792.005gb1407790.851gb1417789.920gb1427789.544gb140.000lc150.000lc987795.278fac1037798.406eoa1047797.626eoa1057796.990eoa1067796.140eoa1077795.655eoa7795.001bm wmh1087794.923eoa1097794.735eoa1107794.400eoa1117794.033eoa1127793.596eoa1137793.278eoa1147793.450wv1157793.330wv1167793.433wmk1177792.599gb1187793.225gb1197793.423gb1207793.965gb1217794.729gb1227795.336gb1237795.517gb1247796.149gb1257796.649gb1267797.579dt1.01277797.580dt1.01287797.369gb1437788.830gb1447788.277gb1457788.271et.51467787.293gb1477786.627gb1487784.938gb1497783.515gb1507783.938et.51517783.392e trans1537783.288e trans1547783.021pped1557782.780em1567778.251g1577779.786g1587781.069g1597787.622et.51607786.662et.51617788.487et.51627786.545g957784.685fac20695967786.158g1637787.182g1647788.334g1657790.221g1667789.720g1677788.903g1687787.681g1697789.645g1707790.457et.41717790.445et.41727791.264et.41737790.139et.41747789.923et.81757789.756et.81767788.566et.81777788.631et.51787788.463et.51797786.938et.51807786.937g1817786.796g1827786.992g1837786.999g1847785.986g189g190g1917792.271et1.01927791.190g1937790.076si1947789.138post1957789.505g1967787.079g1977783.013g1987786.315g1997782.670g2007768.762g2017781.403g2027775.602g2037770.157g2047765.940g2057770.858g2067770.855g2077763.809g2087766.048g2097773.797g2107778.301g2117779.549g2127778.587g2137781.625g2147779.972g2157773.572g2167768.740g2177769.175g2187768.832g2197774.285g2207780.084g7783.8597787.5877787.8092247788.176et.72257788.856et.72267787.872g2277787.665g2287788.260g2297788.759g7789.1087789.5142327790.730g7788.6707785.6777784.4347786.9597786.4117786.7547786.9707787.4297787.5247786.7907784.8497784.2997783.1677782.8412477784.510g2487783.859g2497783.052g7782.9332517777.853g2527778.842g2537777.312g7781.4267782.5207781.7072587778.152g2597774.174g2607770.773g2617767.106g2627769.755g2637767.704g2647773.704g20'@4%95.6'20'@6%96.8'45'@8%7790779277947796779894'90'77887786778877907788 7786 7784 7782 7780 92'89.5'90'90'18'@3%33'@6%96'89'LAWN AREACOVEREDDININGHOTTUBWATER WALL PRIVATE PATIOFIREPIT ACCESS PANELSIGN+89+89+85.5+8589.5'89'88'88'88'89.5'GUEST DROP OFFENTRYSTAMPEDCONCRETEASPHALTDRIVEASPHALTDRIVESLOPE3:12SLOPE3:12 SLOPE3:12SLOPE3:12SLOPE3:12 SLOPE3:12SLOPE8:12SLOPE8:12 SLOPE8:12SLOPE8:12SLOPE3:12 SLOPE8:12 SLOPE8:12SLOPE8:12SLOPE8:12 TYPICAL CLEANOUT3"Ø SDR35 SEWER PIPE1250 GALLON TWOCHAMBER CONCRETESEPTIC TANKDISTRIBUTION VALVEINFILTRATOR CHAMBERS3' X 4' X 12" - QUICK4 PLUS4'4'PROPERTY LINE45'PROPERTY LINEN NOTES:1.NO KNOW EASEMENTS WERE IDENTIFIED ON THE SITE.2.NO WETLANDS WERE NOTED ON THE SITE.3.THE STA WILL BE AT LEAST 45' FROM PROPERTY BOUNDARIES.4.NO WELLS ARE PRESENT ON SITE AS THERE IS PUBLIC WATER SERVICE AVAILABLE.WATER LINES ARE MORE THAN 60 FEET FROM THE OWTS.5.NO SURFACE WATER HAS BEEN IDENTIFIED IN OR AROUND THE SITE PROPERTY LINE.6.REGULATIONS REGARDING SEPTIC TANKS THEIR TIGHTNESS AND CONNECTIONS ARENOTED IN THE REPORT AS THEY RELATE TO EAGLE COUNTY REGULATIONS AND STATEOF COLORADO DEPARTMENT OF HEALTH AND ENVIRONMENT REGULATIONS BY REFERENCE.7.CLEAN-OUT LOCATIONS ARE AS NOTED ON THIS FIGURE.8.STA INSPECTION PORTS ARE AS NOTED ON THE ATTACHED DETAIL FIGURE.9.NO LIMITING LAYER WAS IDENTIFIED IN THE TEST PITS EXCAVATED IN THE STA AREA.10.SITE CONTOURS ARE SHOWN ON THIS FIGURE AND PREVIOUSLY SUBMITTED SITE PLANS.11.A FINISHED FLOOR ELEVATION OF 100 WAS USED TO ASSESS ANTICIPATED INVERT ELEVATIONSAND ANTICIPATED ELEVATION OF INFILTRATIVE SURFACES. April 13, 2021 20-1248 850 Cordillera Way Septic.dwg 20-1248 850 Cordillera Way Septic 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: TJK 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 Manifold TRENCH 1: 20 Infiltration Chambers TRENCH 2: 20 Infiltration Chambers TRENCH 3: 20 Infiltration Chambers 80' 3' 4' 17' Trenches SOIL TREATMENT AREA CROSS SECTION Scale 12" = 1'-0" 12" Tall Infiltrator Chambers Min. 12" Native Soil Backfill - Do Not Compact Native Silt Loam Infiltration Elevation 1/4" Perforations spaced at 4' On-Center along bottom of pipe 4" Dia. Inspection Port Lateral Pipe Perforated Schedule 40 Scarify Soil 3" Below Level & Rake Do Not Compact or Smear Trench Bottom 6" MIN 12" 12" Trenches SOIL TREATMENT AREA CROSS SECTION Scale 3 8" = 1'-0" Infiltration Elev. 7,786 ft Ground Surface Varies Lateral Pipe, Perforated SDR 35 Lateral Pipe, Perforated SDR 35 Native Silt Loam Lateral Pipe, Perforated SDR 35 Max. 48" Min. 12" Native Silt Loam Native Silt Loam Ground Surface Varies Infiltration Elev. 7,786 ft April 13, 2021 20-1248 850 Cordillera Way Septic.dwg 20-1248 850 Cordillera Way Septic 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: TJK 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 = Design flow per person per day B = Number of bedrooms N = Number of persons per bedroom F = 75 Gallons per day B = 5 Bedrooms N = 2 Persons per bedroom Q = 600 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 = 1,500 gallons; Minimum first compartment capacity = 750 gallons (Per Table 9-1) CALCULATION OF OWTS TREATMENT AREA Minimum soil treatment area (STA) = Q / Sandy Loam LTAR, Where: Q = 600 Gallons per day Type 2 Sandy Loam LTAR (Eagle County Table 10-1) = 0.60 Gallons/square foot/day Minimum STA = 1,000 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 = 700 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 = 700/ 12 = 59 Three Trenches with 20 chambers and 80 feet long, See Figure 6. Locations: Summit County & Lakewood, Colorado  Psalm 20 Mailing: 1393 South Inca Street, Denver, Colorado 80223  Phone: 303.238.1770  Office@BestEngineeringUSA.com December 27, 2021 Revised February 11, 2022 Mike Dantas 2121 North Frontage Road West, PMB 206 Vail, Colorado 81657 Subject: Septic Installation Observation 850 Cordillera Way Edwards, Colorado 81632 Project No. 20-1248 At your request, Best Engineering Solutions and Technologies, LLC (BEST) reviewed the drawings and pictures of the subject site in December 2021 to provide observations during installation of the onsite wastewater treatment system. We used information from our Onsite Wastewater Treatment System Design report, dated November 24, 2020, and revised April 13, 2021, project number 20-1248. 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. A modification to the trench length was noted in the as-built construction. Due to the soil conditions, trenches 1 and 2 contained 19 chambers and trench 3 contained 22 chambers. This is an acceptable change to the design, since the treatment area remains the same size. 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. Principal Engineer 2/11/22 Matthew A. Best Digitally signed by Matthew A. Best Date: 2022.02.11 15:18:57 -07'00' 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 850 CORDILLERA WAY EDWARDS, COLORADO 81632 PROJECT NUMBER 20-1248 NOVEMBER 24, 2020 PREPARED FOR SLOPESIDE CONSTRUCTION INC. MIKE DANTAS 2121 N FRONTAGE ROAD W, PMB 206 VAIL, COLORADO 81657 Prepared By: Reviewed By: Kamal M. Hasan, E.I.T. Matthew A. Best, P.E. Staff Engineer Project Engineer 11/24/2020 850 cordillera Way Project Number: 20-1248 [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 ............................................................................................................................................................................................. 5 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 850 cordillera Way Project Number: 20-1248 [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 850 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 five 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 7,610 to 7,645 feet MSL. FIELD EXPLORATION An exploratory test pit was excavated on September 18, 2020, 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 Native sandy loam was encountered to an approximate depth of 4 foot Below Existing Grade (BEG). The soils encountered were slightly moist to moist. Groundwater was not encountered at the time of the pit. Fluctuations in the groundwater levels may occur seasonally or with precipitation events. Samples taken from the exploratory test pit 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 three 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 shall flow 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 different than those that are described in this report, please contact us and we will re-evaluate our design recommendations. 850 cordillera Way Project Number: 20-1248 [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. SOIL TREATMENT AREA 1. The treatment system will consist three trenches, and 20 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. 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. 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 4 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 (North to South) Number of Chambers Trench Length (ft) Infiltration Elevation (ft) Trench 1 20 80 7,786.0 Trench 2 20 80 7,786.0 Trench 3 20 80 7,786.5 OWTS COMPONENTS Recommended OWTS components provided below are based on our design details and our experience with the specific component manufacturers. Equivalent components may be feasible but need to be approved by us prior to construction. SEPTIC TANK 1. A minimum 1,500 gallon, two-chamber, precast septic tank is proposed for the OWTS. The first compartment must be at least 750 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. 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. 850 cordillera Way Project Number: 20-1248 [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. 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 drain to the Manifold. 2.We recommend solid SDR 35 be used for the Manifold pipes. The Manifold pipes should be sloped at 2% minimum to drain from the Manifold. 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 and Manifold 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 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. 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. 850 cordillera Way Project Number: 20-1248 [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. 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, pump vault filter, treatment system, and soil treatment area at least annually for problems or signs of failure. 3. The pump vault filter should be cleaned annually by spray washing solids into the first chamber of the septic tank. 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. 850 cordillera Way Project Number: 20-1248 [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. 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. 173 12620-124811.5-5 BS01146Type 2 Sandy Loam000000000TABLE: 1 Page 1 of 1 Matt@BestEngineeringUSA.com  Depth Sample Type (Note 1)ATTERBERG LIMITSBoring No.BS=Bag SampleNat. Dry Density (PCF)Natural Moist. (%)NOTE 1- Sample Typehttps://bestengineeringusa.sharepoint.com/Shared Documents/Projects/20-1000 Summit Projects/20-1248 850 Cordillera Way/Calcs/[20-1248 850 Cordillera WayTABLE 1.1SUMMARY OF LABORATORY TEST RESULTSPROJECT:LOCATION: SOURCE:PROJECT NO:Field Test Boring / Lab TestingDATE:850 Cordillera WayEdwards, CONovember 24, 2020% 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 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 AD=Air DriedC1= Unconfined CompressionCA=California SampleRM=Remolded SampleOR = Organic content of soilAS=Auger SampleST=Shelby TubeHD=Hand DriveC4=Pocket Value B.E.S.T. 20‐1248 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. 20‐1248 Matt@BestEngineeringUSA.com        Project Number        Figure 2Locations: 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 pitNNot to Scale November 24, 202020-1248 850 CordilleraWay Septic.dwg20-1248 850 Cordillera Way SepticBreckenridge, ColoradoLakewood Office:747 Sheridan Blvd, Unit 2ALakewood, CO 80214SEPTIC LAYOUTProject Location:SCALE: 132" = 1'-0"FIGURE: 5PROJECT NO:DRAWN BY: KMHREVIEWED BY: MABDATE:COVEREDDIN ING SLOPE8:12SLOPE8:12SLOPE 3 :12HOTTUBWATER WALLSLOPE8: 1 2FIREPIT SLOPE8:1 2 20'@4%96.8'20'@6%96'95.6'45'@8%94'92'33'@6%90'89.5'88'89'88'18'@3%88'89.5'89'89.5'90'77987796779477927790778877867790778877807782778677847788 ASPHALTDRIVESTAMPEDCONCRETELAWN AREAASPHALTDRIVE+89GUEST DROP OFFENTRYCONTROLPOINT+89SIGN+85.5+85PRIVATE PATIOACCESS PANELPREVIOUSHOUSELOCATIONPREVIOUS HOUSELOCATIONPREVIOUSHOUSELOCATIONPREVIOUS HOUSELOCATIONSLOPE3:12SLOPE3:12SLOPE3:12SLOPE8:12SLOPE8:12SLOPE8:12SLOPE8:12778477827780SepticTankCleanoutsSTAManifold November 24, 2020 20-1248 850 Cordillera Way Septic.dwg 20-1248 850 Cordillera Way Septic Breckenridge, 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: 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 = Design flow per person per day B = Number of bedrooms N = Number of persons per bedroom F = 75 Gallons per day B = 5 Bedrooms N = 2 Persons per bedroom Q = 600 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 = 1,500 gallons; Minimum first compartment capacity = 750 gallons (Per Table 9-1) CALCULATION OF OWTS TREATMENT AREA Minimum soil treatment area (STA) = Q / Sandy Loam LTAR, Where: Q = 600 Gallons per day Type 2 Sandy Loam LTAR (Eagle County Table 10-1) = 0.60 Gallons/square foot/day Minimum STA = 1,000 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 = 700 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 = 700/ 12 = 59 Three Trenches with 20 chambers and 80 feet long, See Figure 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 GEOTECHNICAL ENGINEERING STUDY 850 CORDILLERA WAY EDWARDS, COLORADO 81632 PROJECT NUMBER 20-1248 OCTOBER 7, 2020 PREPARED FOR SLOPE SIDE CONSTRUCTION INC. MIKE DANTAS 2121 N FRONTAGE ROAD W, PMB 206 VAIL, COLORADO 81657 Prepared By: Reviewed By: Kamal M. Hasan, E.I.T. Thomas J. Krasovec, P.E. Staff Engineer Project Engineer Reviewed By: Matthew A. Best, P.E. Project Engineer 850 Cordillera Way Project Number: 20-1248 [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 EXECUTIVE SUMMARY ...................................................................................................................................................................... 3 PURPOSE AND SCOPE OF WORK ...................................................................................................................................................... 4 PROPOSED CONSTRUCTION .............................................................................................................................................................. 4 SITE CONDITIONS ................................................................................................................................................................................ 4 FIELD EXPLORATION ......................................................................................................................................................................... 4 SUBSURFACE CONDITIONS ............................................................................................................................................................... 4 FOUNDATION DESIGN RECOMMENDATIONS ............................................................................................................................... 5 FLOOR SLABS ....................................................................................................................................................................................... 6 SEISMIC CONSIDERATIONS .............................................................................................................................................................. 7 SURFACE DRAINAGE .......................................................................................................................................................................... 7 UNDERDRAIN SYSTEM ....................................................................................................................................................................... 8 HOMEOWNER PRECAUTIONS ........................................................................................................................................................... 8 DESIGN AND CONSTRUCTION SUPPORT SERVICES .................................................................................................................... 8 LIMITATIONS ........................................................................................................................................................................................ 8 TABLE 1 FIGURE 1 – LOCATION AND SITE MAP FIGURE 2 – LOCATION OF EXPLORATORY PIT FIGURE 3 – PIT LOG FIGURE 4 – LEGEND AND NOTES 850 Cordillera Way Project Number: 20-1248 [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. EXECUTIVE SUMMARY Best Engineering Solutions and Technologies, LLC (BEST) completed a geotechnical engineering study for the project located at 850 Cordillera Way in Edwards, Colorado. Design parameters and a discussion of geotechnical engineering considerations related to construction of the proposed residences are included in this report. A summary of the findings includes: 1. Subsurface exploration encountered native, sand and clay to the maximum depth explored of 5 feet. Groundwater was not encountered during excavation of the test pit. Fluctuations of the groundwater may occur seasonally or with precipitation events. 2. Based on the subsurface conditions encountered in the test pit and the nature of the proposed construction, we recommend the proposed structures be founded on spread footings bearing on native soils. Spread footings bearing as recommended should be designed for an allowable bearing pressure of 2,500 pounds per square foot (psf). 3. Native soils or imported structural fill are suitable for support of concrete slab construction. 4. A representative of our office should observe the construction operations discussed in this report. 5. Keep any exposed soils from excessive drying or wetting during the construction process. 6. More detailed recommendations are made throughout this report. These must be reviewed to assure proper consideration in the design. 850 Cordillera Way Project Number: 20-1248 [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. PURPOSE AND SCOPE OF WORK This report presents the results of a geotechnical engineering study for the project located at 850 Cordillera Way in Edwards, Colorado. The project site is shown on Figure 1. The study was conducted to provide foundation design and support of slabs-on-grade recommendations. Field exploration consisted of one exploratory pit completed to collect information on the subsurface conditions. Samples of the subsoils collected during the field exploration were tested in the laboratory to determine their classification and engineering characteristics. The results of the field exploration and laboratory testing were analyzed to develop recommendations for foundation types, depths, and allowable soil bearing pressures for the proposed building foundations. This report has been prepared to summarize the data obtained during this study and to present our conclusions and recommendations based on the proposed construction and the subsurface conditions encountered. Design parameters and a discussion of geotechnical engineering considerations related to construction of the proposed residences are included in this report. PROPOSED CONSTRUCTION We understand that the proposed construction will consist of a single-family home with an attached garage. Conventional wood frame construction, with column loads expected to be low to moderate and typical of this type of structure, will be used above grade with cast-in-place concrete foundations below grade. Ground floors will be slab-on-grade. Site development is expected to include sidewalk and landscaped areas. Local utilities will generally be underground, except for surface stormwater runoff and overhead electric. If the loadings, locations, or grading plans for the structures change significantly 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 7,802 to 8,812 feet MSL. FIELD EXPLORATION The exploratory pit was excavated on September 18, 2020, approximately at the location shown on Figure 2 to evaluate the subsurface conditions. The pit was excavated using mini excavator and were logged by a representative of BEST. Samples of the soils were taken with bag sampling methods and the depth of the pit and samples are shown on the Pit Log, Figure 3 and Legend and Notes, Figure 4. SUBSURFACE CONDITIONS Native sand and clay to the maximum depth explored of 5 feet. Hard rock excavating may be required at this location to achieve foundation depth requirements. The soils encountered were slightly moist to moist. Groundwater was not encountered at the time of the pit. Fluctuations in the groundwater levels may occur seasonally or with precipitation events. Samples taken from the exploratory pit were obtained for laboratory testing and inspected by a project engineer. The results of the tests performed on the samples obtained from the test pit are shown on Table 1. Laboratory 850 Cordillera Way Project Number: 20-1248 [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. testing included index property tests, such as moisture content and density and minus #200 sieve analysis. The testing was performed on bag samples from the test pit. FOUNDATION DESIGN RECOMMENDATIONS The native soils are suitable to support lightly to moderately loaded slab-on-grade construction. Based on the subsoil conditions encountered in the exploratory pit and the nature of the proposed construction, we recommend that the structures be founded on spread footings bearing on native soils. The design and construction criteria presented below should be observed for a spread footing foundation system. 1. Footings placed on the native soils should be designed for an allowable soil bearing pressure of 2,500 pounds per square foot (psf). Based on experience it is expected that total settlement of the footings, designed and constructed as discussed in this report, would be approximately 1.5-inches or less. Differential movements are estimated to be approximately ½ to ¾ of the total settlement. Most of this settlement will occur during the construction phase. 2. Spread footings placed on native soils should have a minimum footing width of 18 inches for continuous footings and 24 inches for isolated pads. 3. Exterior footings and footings beneath unheated areas should be provided with adequate soil cover above their bearing elevation for frost protection. Placement of foundations at least 36 inches below exterior grade is required by the Eagle County. 4. Continuous foundation walls should be reinforced top and bottom to span local anomalies by assuming an unsupported length of at least 10 feet. 5. A grounding system (Ufer Ground) may be installed where the grounding system is contained within the exterior building wall and the concrete foundation wall. This is in place of having a copper ground rod installed adjacent to the foundation wall. 6. The lateral resistance of a spread footing placed on undisturbed native soils or properly compacted granular structural fill material will be a combination of the sliding resistance of the footing on the foundation materials and passive earth pressure against the side of the footing. Based on the soil characteristics, the resistance to sliding at the bottoms of the footings can be calculated based on a coefficient of friction of 0.40. Passive pressure against the sides of the footings can be calculated using an equivalent fluid unit weight of 400 pounds per cubic foot (pcf). The at-rest lateral pressures on the walls can be calculated using an equivalent fluid density of 55 psf per foot of depth. The active lateral earth pressures should use an equivalent fluid density of about 35 psf per foot of depth. These lateral resistance values are working values. 7. All loose or soft soils should be removed, and the footing shall bear on native soils or properly compacted structural fill. Any disturbed surface of the native soils should be compacted prior to concrete placement. 8. Interior backfill should consist of onsite native soils and should be placed in uniform lifts not to exceed 10 inches thick and compacted to at least 98% of the standard Proctor (ASTM D 698) maximum dry density and within 2 percentage points of the optimum moisture content. Interior backfill should extend laterally beyond the edges of the footings at a distance at least equal to the depth of the fill below the footing subgrade. Prior to the fill placement, any loose subgrade soils should be compacted. Any wet and soft or frozen 850 Cordillera Way Project Number: 20-1248 [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. subgrade soils should be removed prior to fill placement. The backfill material should be free of snow and ice, vegetation, topsoil, organics, trash, construction debris, oversized rocks greater than 8 inches in diameter, and other deleterious material. 9. Exterior backfill may consist of the onsite native soils or imported structural fill and should be properly placed and compacted to reduce the risk of settlement and distress. Onsite backfill material placed on the exterior of the structure should be placed and compacted to at least 95% of the standard Proctor (ASTM D 698) maximum dry density within 2 percentage points of the optimum moisture content. 10. Backfill in pavement and walkway areas should also be compacted to at least 95% of the standard Proctor (ASTM D 698) maximum dry density and within 2 percentage points of the optimum moisture content. Care should be taken when compacting around the foundation walls and underground structures to avoid damage to the structure. Hand compaction procedures may be used to prevent excessive lateral pressures from exceeding the design values. 11. Backfill in landscaped areas may consist of native onsite soils or imported structural fill. It should be placed in uniform lifts and compacted to at least 90% of the standard Proctor (ASTM D 698) maximum dry density within 2 percentage points of the optimum moisture content. 12. Utility backfill should be compacted as appropriate for the proposed surface uses (landscape, building, pavement, etc.). 13. All foundation and retaining structures should be designed for appropriate hydrostatic and surcharge pressures, such as adjacent footings, traffic, construction materials, and equipment. The buildup of water behind a wall or an upward sloping backfill surface will increase the lateral pressure imposed on a foundation wall or retaining structure. An underdrain system should be provided to prevent hydrostatic pressure buildup behind the walls. The lateral resistance values identified above assume drained conditions behind the walls and a horizontal backfill surface. Refer to the Underdrain System section for further information. Minor cracking of concrete foundation walls should be expected. 14. Based on our experience, we recommend all concrete exposed to the onsite materials meet the cement requirements for Class 0 exposure of sulfate attack on concrete as presented in ACI 318-14. Alternatively, the concrete could meet the CDOT requirements for Class 0 exposure as presented in Section 601.04 of the CDOT Standard Specifications for Road and Bridge Construction (2017). 15. Depending upon depth of excavation and seasonal conditions, groundwater may be encountered within excavations on the site. Pumping from sumps may be utilized to control water within excavations, if necessary. BEST is available to provide further dewatering recommendations if this issue arises. 16. A BEST representative should observe all footing excavations prior to concrete placement to evaluate soil bearing conditions. FLOOR SLABS The native soils are suitable to support lightly to moderately loaded slab-on-grade construction. To reduce the effects of differential movement, floor slabs should be separated from all bearing walls and columns with expansion joints, which allow unrestrained vertical movement. Interior non-bearing partitions resting on floor 850 Cordillera Way Project Number: 20-1248 [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. slabs should be provided with slip joints so that, if the slabs move, the movement cannot be transmitted to the interior structure. This detail is also important for wallboards, stairways and door frames. Slip joints which will allow at least 1.5 inches of vertical movement are recommended. Floor slab control joints should be used to reduce damage due to shrinkage cracking. Joint spacing is dependent on slab thickness, concrete aggregate size, and slump, and should be consistent with recognized guidelines such as those of the Portland Cement Association (PCA) and American Concrete Institute (ACI). The joint spacing and slab reinforcement should be established by the designer based on experience and the intended slab use. Fill placed beneath floor slabs may consist of native onsite soils, an imported structural fill, or non-expansive, predominantly granular material. The geotechnical engineer should evaluate the suitability of fill materials prior to placement. Slab performance is greatly dependent on the amount of moisture introduced to the underlying soils, which could result in potential excessive movement causing uneven slabs and cracking. Proper surface grading and foundation drain installation will help to reduce water infiltration in the sub-slab soils. Recommendations within the Surface Drainage and the Underdrain System sections below, should be followed. Recommendations provided in this section are meant to reduce the possible distress caused by slab movement but will not completely eliminate risk. A structurally supported floor system should be used if the owner cannot tolerate potential movement. SEISMIC CONSIDERATIONS This area of Edwards is located in Seismic Design Category “B”. The soil at the foundation level has a very dense soil profile. The average soil profile in the top one-hundred feet provides an overall “stiff soil” profile, which provides a Site Class of “D”. Based on the subsurface profile, site seismicity, and the anticipated ground conditions; liquefaction is not a design consideration. SURFACE DRAINAGE Proper surface drainage is very important for acceptable performance of the slab-on-grade during construction and after the construction has been completed. The following recommendations should be used as guidelines and changes should be made only after consultation with the geotechnical engineer. 1. Excessive wetting or drying of the excavation and underslab areas should be avoided during construction. 2. The ground surface surrounding the exterior of the building should be sloped to drain away from the foundation in all directions. We recommend a minimum slope of 12 inches in the first 10 feet in unpaved areas and a minimum slope of 3 inches in the first 10 feet in paved areas. Free-draining wall backfill should be capped with approximately 2 feet of the onsite finer graded soils to facilitate surface drainage. Site drainage beyond the 10-foot zone should be designed to promote runoff and reduce infiltration. These slopes may be changed as required for handicap access points in accordance with the Americans with Disabilities Act. 3. Xeriscaping should be considered with limited irrigation within 4 feet of the foundation walls. Roof downspouts and drains should discharge well beyond the limits of all backfill and onto splash blocks. 850 Cordillera Way Project Number: 20-1248 [8] 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. UNDERDRAIN SYSTEM The slab-on-grade construction precludes the need for an underdrain system. It is recommended that an impermeable plastic sheet be placed beneath the floor slab in any living spaces to reduce moisture migration through the concrete slab. The sheet should be secured to the interior of the foundation walls. There should be a minimum one-foot side lap and at least two-feet of end lap. HOMEOWNER PRECAUTIONS All new construction has an adjustment period after construction is completed. Exterior and interior observations should be performed on a regular basis. The exterior backfill should be checked for positive drainage away from the foundation. No ponding of water should be observed. Roof downspouts and splash blocks should direct water away from the foundation. The discharge of any sump should be free of blockage and discharge away from the foundation. DESIGN AND CONSTRUCTION SUPPORT SERVICES Please consider retaining BEST to provide the following services: 1. Review of the project plans and specifications for conformance with the recommendations provided in this report. 2. Observation and testing to document that the intent of this report and that the requirements of the plans and specifications are being followed during construction. 3. Identification of possible variations in subsurface conditions from those encountered in this study, so that recommendations can be re-evaluated, if needed. 4. Preparation of a shoring plan, if necessary, for the protection of adjacent structures. BEST is also available to assist the design team in preparing specifications for the geotechnical aspects of the project and performing additional studies if necessary, to accommodate possible changes in the proposed construction. LIMITATIONS This study has been conducted in accordance with generally accepted geotechnical 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 pit at the locations indicated on Fig. 2, and the proposed construction. This report may not reflect subsurface variations that occur between the pits. 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. The scope of services for this project does not include any environmental assessment of the site or identification of contaminated or hazardous materials or conditions. In addition, this study does not include determination of 850 Cordillera Way Project Number: 20-1248 [9] 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. the presence, prevention, or possibility of mold or other biological contaminants developing in the future. If the owner is concerned about the potential for such contamination, other studies should be undertaken. Matthew A. Best, P.E. Project Engineer 4/13/2021 Eagle County Government Mail - 850 Cordillera Way - Design Submittal https://mail.google.com/mail/u/0?ik=08c22beb03&view=pt&search=all&permthid=thread-a%3Ar-3193582908389485833&simpl=msg-a%3Ar-64099118…1/1 Danielle Sell <danielle.sell@eaglecounty.us> 850 Cordillera Way - Design Submittal 1 message Danielle Sell <danielle.sell@eaglecounty.us>Tue, Apr 13, 2021 at 5:17 PM To: Matt Best <Matt@bestengineeringusa.com>, Tom Krasovec <Tom@bestengineeringusa.com>, "Michael R. Dantas" <mike.dantas67@gmail.com>, joemenendez58@gmail.com, Kamal Hasan <Kamal@bestengineeringusa.com> Cc: Claire Lewandowski <claire.lewandowski@eaglecounty.us> Good afternoon, The design as submitted for 850 Cordillera Way cannot be approved. There are many inconsistencies noted in the design. It is mentioned in one area that this system is sized for 3 bedrooms and then it is sized for 5 in another spot. The drawing specifies a 1,250 gallon tank but the septic tank description describes a 1,500 gallon tank. The drawing also conflicts between figure 5A and figure 6 where a distribution valve is noted and then a manifold is noted. Did you mean distribution box? If so, can you provide specifications on this? Flow equalizers or equivalent are required by the regulations for distribution boxes to adjust flow to the laterals. Please also describe how the distribution box will be accessible at grade. It is not recommended that a manifold be used in a gravity system. What is the specific setback distance of the septic tank and STA from the house? What is the length of the sewer line? It also looks like there is a previous house location noted on the drawing. Is there foundation remaining in this area? If the soil is disturbed from this, the STA should not be located in this area. It is also specified that the maximum cut for the uphill side of the excavation shall be 4 feet to the infiltration surface. Because the test pits were only dug to 7 feet, the maximum cut should be 3 feet to the infiltration surface for vertical separation. It should also be noted that the trenches should be installed level. -- Danielle Sell, M.S. Environmental Health Specialist I Eagle County Public Health and Environment Office: (970) 328-8755 Direct: (970) 471-6481 danielle.sell@eaglecounty.us 4/13/2021 Eagle County Government Mail - 850 Cordillera Way - Design Submittal https://mail.google.com/mail/u/0?ik=08c22beb03&view=pt&search=all&permthid=thread-a%3Ar-2191391708482936647&simpl=msg-a%3Ar37021054…1/3 Danielle Sell <danielle.sell@eaglecounty.us> 850 Cordillera Way - Design Submittal 6 messages Danielle Sell <danielle.sell@eaglecounty.us>Tue, Mar 9, 2021 at 4:56 PM To: Tom@bestengineeringusa.com, Kamal@bestengineeringusa.com, "Michael R. Dantas" <mike.dantas67@gmail.com>, Matt@bestengineeringusa.com, joemenendez58@gmail.com Cc: Claire Lewandowski <claire.lewandowski@eaglecounty.us> Good afternoon, The design received for 850 Cordillera Way is denied. The submission does not meet ECPHE regulations and engineering practices for OWTS. Please let us know if you'd like to discuss this further over email or if you'd like to schedule a virtual meeting. -- Danielle Sell, M.S. Environmental Health Specialist I Eagle County Public Health and Environment Office: (970) 328-8755 Direct: (970) 471-6481 danielle.sell@eaglecounty.us For the most recent COVID-19 information, including vaccine distribution, please visit www.eaglecountycovid.org | CovidQuestions@eaglecounty.us Tom Krasovec <Tom@bestengineeringusa.com>Wed, Mar 10, 2021 at 5:49 AM To: Danielle Sell <danielle.sell@eaglecounty.us>, Kamal Hasan <Kamal@bestengineeringusa.com>, "Michael R. Dantas" <mike.dantas67@gmail.com>, Matt Best <Matt@bestengineeringusa.com>, "joemenendez58@gmail.com" <joemenendez58@gmail.com> Cc: Claire Lewandowski <claire.lewandowski@eaglecounty.us> Danielle, Please provide details for the denial so that we can look to address. Thank You TJK [Quoted text hidden] Danielle Sell <danielle.sell@eaglecounty.us>Wed, Mar 10, 2021 at 4:52 PM To: Tom Krasovec <Tom@bestengineeringusa.com> Cc: Kamal Hasan <Kamal@bestengineeringusa.com>, "Michael R. Dantas" <mike.dantas67@gmail.com>, Matt Best <Matt@bestengineeringusa.com>, "joemenendez58@gmail.com" <joemenendez58@gmail.com>, Claire Lewandowski <claire.lewandowski@eaglecounty.us> Hi Tom, 4/13/2021 Eagle County Government Mail - 850 Cordillera Way - Design Submittal https://mail.google.com/mail/u/0?ik=08c22beb03&view=pt&search=all&permthid=thread-a%3Ar-2191391708482936647&simpl=msg-a%3Ar37021054…2/3 I have attached the plan review checklist for the OWTS design with the items missing highlighted. Please let me know if you have any additional questions. Thanks, Danielle [Quoted text hidden] Plan.Rvw.Checklist.OWTS.pdf 315K Claire Lewandowski <claire.lewandowski@eaglecounty.us>Wed, Mar 10, 2021 at 5:46 PM To: Danielle Sell <danielle.sell@eaglecounty.us> Cc: Tom Krasovec <tom@bestengineeringusa.com>, Kamal Hasan <Kamal@bestengineeringusa.com>, "Michael R. Dantas" <mike.dantas67@gmail.com>, Matt Best <Matt@bestengineeringusa.com>, "joemenendez58@gmail.com" <joemenendez58@gmail.com> Thank you, Danielle! Tom and Matt, along with the checklist highlights that are missing, and the choice to use a manifold on a gravity equal trench distribution system, that would not provide for equal distribution in case of ground settling and preferential flow, I am also curious as to your choice to include perforated laterals along the length of each chambered media trench. This option is usually used in dosed or pressure dosed systems or rock and pipe beds. I do not often see it in chambered media gravity equal distribution systems as it then would require flushing laterals. I do not see it as prohibited but don't see the benefit either so I am interested in your professional opinion in the benefits of this choice..let me know your thoughts. As for the manifold, a distribution box with flow equalizers would be more appropriate, otherwise option for serial or sequential distribution could be used. Please let us know what questions you have. Sincerely, Claire Claire Lewandowski, REHS Environmental Health Specialist III Eagle County Public Health & Environment 970-328-8747 [Quoted text hidden] Claire Lewandowski <claire.lewandowski@eaglecounty.us>Tue, Mar 23, 2021 at 2:58 PM To: "Michael R. Dantas" <mike.dantas67@gmail.com>, Matt Best <Matt@bestengineeringusa.com>, Tom Krasovec <tom@bestengineeringusa.com> Cc: Kamal Hasan <Kamal@bestengineeringusa.com>, "joemenendez58@gmail.com" <joemenendez58@gmail.com>, Danielle Sell <danielle.sell@eaglecounty.us> Good afternoon all, We received a call today from the Cordillera design review team asking if 850 Cordillera has an OWTS permit. I let them know the design was denied and sent back on March 9th and nothing has been resubmitted. Please let us know if you have questions or concerns. Thank you, Claire [Quoted text hidden] 4/13/2021 Eagle County Government Mail - 850 Cordillera Way - Design Submittal https://mail.google.com/mail/u/0?ik=08c22beb03&view=pt&search=all&permthid=thread-a%3Ar-2191391708482936647&simpl=msg-a%3Ar37021054…3/3 -- Claire Lewandowski, REHS Environmental Health Specialist III 970-328-8755 (office) 970-328-8747 (direct) environment@eaglecounty.us www.eaglecounty.us For current information on COVID19 in Eagle County, please visit http://eaglecountycovid.org/ CovidQuestions@eaglecounty.us | 970-328-9750 Michael R. Dantas <mike.dantas67@gmail.com>Tue, Mar 23, 2021 at 5:46 PM To: Claire Lewandowski <claire.lewandowski@eaglecounty.us>, Matt Best <Matt@bestengineeringusa.com>, Tom Krasovec <tom@bestengineeringusa.com> Cc: Kamal Hasan <Kamal@bestengineeringusa.com>, joemenendez58@gmail.com, Danielle Sell <danielle.sell@eaglecounty.us> Claire, we know that the design has been denied. We might have the changes to you tomorrow. Mike Dantas/Slopeside Construcon Inc 2121 N Frontage Rd W, PMB 206 Vail, CO 81657 970-376-5444 mike.dantas67@gmail.com [Quoted text hidden] 2/14/22, 3:04 PM IMG_0164.JPEG https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 3:04 PM IMG_0165.JPEG https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 3:04 PM IMG_0166.JPEG https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 3:05 PM IMG_0167.JPEG https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 3:05 PM IMG_0168.JPEG https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 3:05 PM IMG_0169.JPEG https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 3:05 PM IMG_0170.JPEG https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 3:05 PM IMG_0171.JPEG https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 3:05 PM IMG_0172.JPEG https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 3:05 PM IMG_0173.JPEG https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 2:57 PM IMG_9784.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 2:57 PM IMG_9785.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 2:57 PM IMG_9786.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 2:57 PM IMG_9788.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/14/22, 2:57 PM IMG_9789.jpg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1 2/15/22, 8:09 AM IMG_8125.jpeg https://mail.google.com/mail/u/0/#inbox?projector=1&messagePartId=0.1 1/1