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HomeMy WebLinkAbout1335 Cordillera Wy - 210712204004Environmental Health
Department
P.O. Box 179
500 Broadway
Eagle, CO 81631-0179
Phone: (970) 328-8730
Fax: (970) 328-7185
Permit
Permit No. OWTS-021529-2021
Permit Type: OWTS Permit
Work Classification: New
Permit Status: Active
Issue Date: 6/14/2021 Expires: 4/10/2023
On-Site Wastewater
Treatement System
Project Address Parcel Number
1335 CORDILLERA WY, EDWARDS AREA,210712204004
Owner Information Address
Robert Kedrowski 1335 Cordillera WAY
Edwards, CO 81632
Phone: (970) 390-4341
Cell:
Email: kedrowskibuilders@gmail.com
Inspections:
For Inspections Call: (970)
328-8755
Engineer Phone Email
Best Engineering Solutions and Technologies,
Matthew Best
(970) 409-9670 matt@bestengineeringusa
.com
Contractor License Number Phone Email
Bronn Excavating Bronn4867@yahoo.com(970) 977-0261OWTSPL-000179-20
22
Permitted Construction / Details:
Install the new system exactly as depicted in the B.E.S.T. Engineering Solutions design stamped and signed on
June 11th, 2021 by Matthew Best, PE. The new system will be sized to accommodate the maximum daily flows for a
4 bedroom residence.
The OWTS consists of one sewer line from the residence. A Valley Precast 1,250 gallon, two compartment septic
tank with an effluent filter in the outlet tee will be used. A distribution box equipped with flow equalizers will be
accessible at grade. The STA consists of 4 shallow trenches of 13 Infiltrator Quick 4 Plus Standard chambers for a
total of 52. An additional test pit adjacent to the STA must be conducted and reviewed by the Design Engineer, prior
to installation.
Contact Eagle County Environmental Health and the design engineer well in advance of requesting inspections prior
to backfilling any component of the OWTS. The design engineer is responsible for conducting all inspections
necessary to certify the installation and assure the functionality of the system. System certification, along with
photos and a record drawing is required to be submitted to and approved by Eagle County Environmental Health
prior to the use of the system.
THIS PERIMT EXPIRES BY TIME LIMITATION AND BECOMES NULL AND VOID IF THE WORK AUTHORIZED BY THE PERMIT IS NOT COMMENCED WITHIN 120 DAYS
OF ISSUANCE, OR BEFORE THE EXPIRATION OF AN ASSOCIATED BUILDING PERMIT
Issued by: Environmental Health Department, Eagle County, CO
Danielle Salinsky
Date
June 14, 2021
CONDITIONS
1.
2.ALL INSTALLATIONS MUST COMPLY WITH ALL REQUIREMENTS OF THE EAGLE COUNTY PUBLIC HEALTH AGENCY ON-SITE WASTEWATER TREATMENT SYSTEM
REGULATIONS ADOPTED PURSUANT TO AUTHORITY GRANTED IN CR.S. 25-10-101, et seq., AS AMENDED
3.THIS PERMIT IS VALID ONLY FOR PERFORMING WORK ON OWTS ASSOCIATED WITH STRUCTURES WHICH HAVE FULLY COMPLIED WITH COUNTY ZONING AND
BUILDING REQUIREMENTS CONNECTION TO, OR USE WITH, ANY DWELLING OR STRUCTURE NOT APPROVED BY THE ZONING AND BUILDING DEPARTMENTS
SHALL AUTOMATICALLY BE A VIOLATION OF A REQUIREMENT OF THE PERMIT AND WILL RESULT IN BOTH LEGAL ACTION AND REVOCATION OF THE PERMIT
4.1.6(A)(1) EAGLE COUNTY PUBLIC HEALTH AGENCY ON-SITE WASTEWATER TREATMENT SYSTEM REGULATIONS REQUIRES ANY PERSON WHO CONSTRUCTS,
ALTERS OR INSTALLS AN ON-SITE WASTEWATER TREATMENT SYSTEM TO BE LICENSED
Thursday, October 13, 2022 1
Inspection Result
Eagle County, Colorado
P.O. Box 179 500 Broadway Eagle, CO
Phone: (970) 328-8730 Fax: (970) 328-7185
IVR Phone: 1-866-701-3307
Inspection Number: INSP-527058-2023 Permit Number: OWTS-021529-2021
Inspection Date: 11/09/2023
Inspector:
Permit Type: OWTS Permit
Inspection Type: OWTS Final Inspection
Work Classification: NewOwner:Kedrowski Builders
Job Address:1335 CORDILLERA WY IVR Pin Number:193237
EDWARDS AREA, CO Project:<NONE>
Parcel Number:210712204004
Contractor:Phone: (970) 977-0261 / Cell: (970) 977-0261Bronn Excavating
Inspection Status: Approved
Inspection Notes
Inspector Comments
Added Item: Septic Tank
A Valley Precast 1,250 gallon, two compartment septic tank with an effluent filter in the outlet tee was
installed. A distribution box is accessible at grade.
Added Item: Record Drawing
Received 11/8/2023.
Added Item: Record Photos
Received 11/8/2023.
Added Item: Site and Soil
Received 6/1/2021.
Added Item: Final Certification Letter
Received 11/8/2023.
Added Item: General Plan
Received 6/1/2021.
Added Item: Soil Treatment Area (STA)
The STA consists of 4 shallow trenches of 13 Infiltrator Quick 4 Plus Standard chambers for a total of
52.
Added Item: Identification of Systems Contractor
Bronn Excavating was the licensed installer.
Thursday, November 9, 2023
For more information visit: http://www.eaglecounty.us
Page 1 of 2
Thursday, November 9, 2023
For more information visit: http://www.eaglecounty.us
Page 2 of 2
1393 South Inca Street, Denver, Colorado Psalm 20 Phone: 303-238-1770 Office@BestEngineeringUSA.com
December 22, 2022
Bob and Barbara Kedrowski
Kedrowski Builders
1335 Cordillera Way
Edwards, Colorado 81632
Subject: Septic Installation Observation &
As-built Submittal
1335 Cordillera Way
Edwards, Colorado 81632
Project No. 21-1184
At your request, Best Engineering Solutions and Technologies, LLC (BEST) visited the subject site on October
20, 2022, to provide observations during installation of the onsite wastewater treatment system. We used
information from our Onsite Wastewater Treatment System Design report, dated April 29, 2021, and revised
June 11, 2021, project number 21-1184. Our observations and recommendations are presented below.
The onsite wastewater treatment system was observed for consistency with the design as shown in our report,
listed above. The tank, pipes, and soil treatment area were installed in general conformance with standard
construction practice and our design during our site visit. No deviations from our report are necessary. An as-
built drawing had been requested and is attached as Figure 1.
Our observation and recommendations submitted in this report are based on the conditions observed during our
site visit. Best Engineering Solutions and Technologies, LLC is not responsible for liability associated with
construction defects contrary to the recommendations in our design report.
If you have any questions regarding this report, please feel free to contact us.
Respectfully submitted,
BEST ENGINEERING
Matthew A. Best, P.E. 12/22/22
Principal Engineer
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
ONSITE WASTEWATER TREATMENT SYSTEM DESIGN
1335 CORDILLERA WAY
EDWARDS, COLORADO
81632
PROJECT NUMBER 21-1184
APRIL 29, 2021
REVISED JUNE 11, 2021
PREPARED FOR
KEDROWSKI BUILDERS
BOB AND BARBARA KEDROWSKI
340 CORDILLERA WAY
EDWARDS, COLORADO
81632
Prepared By: Reviewed By:
Kamal M. Hasan, E.I.T. Matthew A. Best, P.E.
Staff Engineer Project Engineer
6/11/2021
Matthew Best Digitally signed by Matthew Best
Date: 2021.06.11 12:14:00 -06'00'
1335 cordillera Way
Project Number: 21-1184
[2]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
Table of Contents
PURPOSE AND SCOPE OF WORK ...................................................................................................................................................... 3
PROPOSED CONSTRUCTION .............................................................................................................................................................. 3
SITE CONDITIONS ................................................................................................................................................................................ 3
FIELD EXPLORATION ......................................................................................................................................................................... 3
SUBSURFACE CONDITIONS ............................................................................................................................................................... 3
OWTS ANALYSIS .................................................................................................................................................................................. 3
DESIGN RECOMMENDATIONS .......................................................................................................................................................... 3
SETBACKS ............................................................................................................................................................................................. 6
HOMEOWNER PRECAUTIONS ........................................................................................................................................................... 6
LIMITATIONS ........................................................................................................................................................................................ 7
FIGURE 1 –SITE MAP
FIGURE 2 – LOCATIONS OF EXPLORATORY TEST PITS
FIGURE 3 – TEST PITS LOGS
FIGURE 4 – LEGEND AND NOTES
FIGURE 5 – SEPTIC LAYOUT
FIGURE 6 – SOIL TREATMENT AREA CALCULATIONS
FIGURE 7 – SOIL TREATMENT AREA DETAILS
1335 cordillera Way
Project Number: 21-1184
[3]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
PURPOSE AND SCOPE OF WORK
This report presents the results of an onsite wastewater treatment system (OWTS) design for the project at 1335
cordillera Way in Eagle County, Colorado. The purpose of this report is to provide design details for an OWTS
in accordance with the 2018 Eagle County Onsite Wastewater Treatment System Regulations. The project site
is shown on Figure 1. Please refer to this report for subsurface information and recommendations.
PROPOSED CONSTRUCTION
We understand that the proposed residence will be a single-family home with an attached garage. The residence
will have four bedrooms. The home will be conventional wood frame construction.
If the number of bedrooms for the residence are different from those described above, we should be notified to
re-evaluate the recommendations contained in this report.
SITE CONDITIONS
At the time of our field exploration, the property consisted of vacant lot. The site is bounded by residential single-
family homes and undeveloped lots. The topography in the area slopes toward the north and east and is at an
approximate ranging elevation of 7,870 to 7,980 feet MSL.
FIELD EXPLORATION
Exploratory test pits were excavated on April 20, 2021, approximately at the locations shown on Figure 2 to
evaluate the soil treatment area (STA) subsurface conditions. The test pits were excavated with a mini-excavator
and logged by a representative of BEST. Samples of the soils were taken with disturbed sampling methods and
the depths of the samples are shown on the Test Pits Logs, Figure 3 and Legend and Notes, Figure 4.
SUBSURFACE CONDITIONS
TP-1 encountered native sandy loam to the maximum depth explored of 6 feet Below Existing Grade (BEG).
TP-2 encountered native loam to the maximum depth explored of 8 feet BEG. The soils encountered were slightly
moist to moist. Groundwater was not encountered at the time of the pits. Fluctuations in the groundwater levels
may occur seasonally or with precipitation events.
Samples taken from the exploratory test pits were retained for laboratory testing and inspected by the project
engineer. The results of the tests performed on the field samples are shown on Table 1. Laboratory testing
included index property tests, for moisture content and gradation analysis. The testing was performed on
disturbed bulk samples and were in general conformance with recognized test procedures, primarily, ASTM and
United States Department of Agriculture (USDA).
OWTS ANALYSIS
We recommend trench construction and infiltrator chambers be used to provide effluent treatment from the
proposed residence. The STA was sized for a maximum of four bedrooms, Type 2 soil with a Long-term
acceptance rate (LTAR) of 0.60, and TL1. Calculations are provided on Figure 6. The effluent will gravity flow
to the septic tank for primary treatment and gravity flow through a distribution box with equalizers to the STA
for final treatment.
DESIGN RECOMMENDATIONS
The design recommendations presented below are based on the proposed construction, the site, and subsurface
conditions encountered and our experience in this area. If conditions encountered during construction are
1335 cordillera Way
Project Number: 21-1184
[4]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
different than those that are described in this report, please contact us and we will re-evaluate our design
recommendations.
SOIL TREATMENT AREA
1. The treatment system will consist of four trenches, and 13 infiltration chambers long, see Table A below.
The trenches shall be a maximum width of 36-inches and shall be spaced at least 48-inches from trench
wall to trench wall. The STA was placed outside the former structure area which has been previously
removed.
2. The chambers shall be Quick4 Plus Standard infiltrator chambers, or an approved equivalent. Chambers
shall be installed in accordance with the manufacture’s recommendations and remain level across the
length of each set of chambers.
3. Topsoil within the proposed STA shall be stripped and removed prior to excavation of the trenches.
4. The maximum cut for the uphill side of the excavation shall be 3 feet to the infiltration surface. The base
excavation should be scarified prior to chamber placement.
5. A minimum 12 inches of cover soil should be placed over the geotextile. The soil cover may consist of
native sandy loam Type 1 or 2 materials.
6. Backfill should be graded to deflect surface water away from the STA and should be sloped at 3H:1V
maximum.
7. Disturbed soil should be re-vegetated as soon as possible with a native grass seed mixture. No trees,
shrubs, or other plants with deep roots should be planted on or near the STA as this may damage the
system.
8. Four-inch diameter inspection ports should be installed vertically into the beginning and end of each
trench. The inspection ports should extend at least 8 inches above the finished ground surface or be
protected in a valve box at finished grade. The portion that lies within the gravel layer should be perforated.
9. A plan view of the STA is presented on Figure 2 with a cross section view presented on Figure 5.
TABLE A – TRENCH CHAMBER SCHEDULE
Trench Number
Number of Chambers
Trench Length (ft)
Anticipated
Infiltration Elevation (ft)
Trench 1 13 52 7,928
Trench 2 13 52 7,930
Trench 3 13 52 7,932
Trench 4 13 52 7,934
OWTS COMPONENTS
Recommended OWTS components provided below are based on our design details and our experience with the
specific component manufacturers. Equivalent components may be feasible but need to be approved by us prior
to construction.
SEPTIC TANK
1. A minimum 1,250 gallon, two-chamber, precast septic tank is proposed for the OWTS (Valley Precast
1250M-2CP, or equivalent). The first compartment must be at least 625 gallons. The baffle or wall
between the first and second compartments must be properly sealed to prevent cross-compartment flow.
2. The tank must be set level. The bottom of the excavation shall be free of large rocks or other objects that
could damage the tank during placement. A gravel or road base bedding material may be necessary to
prevent tank damage during placement and act as a leveling course.
3. Tank shall be backfilled uniformly on all sides in lifts less than 24” and mechanically compacted.
4. Install tank with 2 feet minimum cover soil for frost protection. Maximum soils cover depth is 4 feet.
1335 cordillera Way
Project Number: 21-1184
[5]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
5. The septic lids must extend to final surface grade and made to be easily located.
6. An effluent filter shall be located prior to exiting the tank. The effluent filter shall be provided with a
handle located within 12-inches of the tank lid to allow for removal and cleaning of the screen.
SEWER PIPE
1. The sewer line from the residence to the septic tank should not be less than the diameter of the building
drain and not less than 4 inches in diameter.
2. Install cleanout pipes within 5 feet of the building foundations and if necessary, where the sewer pipe
bends 90 degrees or more and every 100 feet of sewer pipe.
3. The sewer pipe should have a rating of SDR35 or better. The sewer pipe should be sloped between 2%
and 4% to help limit disturbance of solids in the tank and potential sewage bypass of the first chamber of
the tank. If a steeper slope is necessary, this can be accomplished with vertical step-downs in the sewer
line, prior to the last 5 feet the tank.
4. A minimum of 36 inches of cover soil should be provided over the sewer pipe. Paved areas, patios, or
other areas without vegetative cover may be more susceptible to frost. We recommend a minimum of 48
inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with 2-
inch think blue foam insulation board. If adequate soil cover is not possible, we should be contacted for
re-evaluation prior to construction. If the sewer pipe passes under a paved area the pipe shall be SDR 35.
5. The sewer pipe should be bedded in compacted ¾-inch road base or native soils provided that the native
soils contain no angular rocks or rocks larger that 2.5-inches in diameter to help prevent settlement of the
pipe. Sags could cause standing effluent to freeze and damage piping.
6. All 90-degree bends should be installed using a 90-degree long sweep or by using two 45-degree elbows.
7. The sewer line location shown on Figure 2 is considered conceptual. We assume that there will be only
one sewer line exiting the residence. It is the responsibility of the owner to locate all sewer line exit
locations and connections to the septic tank. We should be notified if there are other sewer lines exiting
the residences.
EFFLUENT PIPING
1. We recommend a 3.0-inch diameter, solid, SDR 35 effluent distribution pipe that should be sloped at 2%
minimum to the distribution box and then to the drain field.
2. We recommend solid SDR 35 be used for the distribution pipes. The distribution pipes should be sloped
at 2% minimum to the drain field from the distribution box.
3. We recommend perforated SDR 35 be used for the lateral pipes. The lateral pipes should be attached close
to the chamber dome with an all-weather plastic pipe strap at every chamber connection.
4. The effluent distribution pipe should be bedded in compacted ¾-inch road base or native soils provided
that the native soils contain no angular rocks or rocks larger than 2.5-inches in diameter to help prevent
settlement of the pipe. Sags could cause standing effluent to freeze and damage piping.
5. A minimum of 24-inches of cover soil should be provided over the effluent piping. Paved areas, patios,
or other areas without vegetative cover may be more susceptible to frost. We recommend a minimum of
48 inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with
2-inch think blue foam insulation board. If adequate soil cover is not possible, we should be contacted for
re-evaluation prior to construction.
6. The effluent pipe should be double encased with larger diameter Schedule 40 PVC pipe underneath
driveway surfaces and be provided with a minimum of 48 inches of soil cover and be insulated on top and
sides with 2-inch-thick foam insulation board.
7. All 90-degree bends should be installed using a 90-degree long sweep or by using two 45-degree elbows.
1335 cordillera Way
Project Number: 21-1184
[6]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
SETBACKS
Below is a table of common minimum horizontal setbacks to OWTS components. Refer to the Eagle County
Regulations for a complete list of required setbacks. We recommend that OWTS components be surveyed by a
Professional Land surveyor licensed in Colorado and verified by BEST prior to the system permitting.
TABLE B – COMMON MINIMUM HORIZONTAL SETBACKS FROM OWTS COMPONENTS
Wells
Water
Supply
Line
Occupied
Dwelling
with
Basement
Property
Lines, or
Lined Ditch
Lake,
Irrigation Ditch,
Stream,
Wetland
Dry Ditch,
Gulch, or
Cut Bank
Septic
Tank
Absorption
Trenches
100’ 25’ 20’ 10’ 50’ 25’ 5’
Septic Tank 50’ 10’ 5’ 10’ 50’ 10’ -
Building Sewer
Lines
50’ 5’ 0’ 10’ 50’ 10’ -
HOMEOWNER PRECAUTIONS
The OWTS will require periodic inspection and maintenance to function properly. A properly designed, installed,
and maintained system can greatly increase its lifespan. The level of maintenance will vary depending on the
complexity of the system and water use habits of the residents. Below are some basic recommendations for the
OWTS operation and maintenance.
HOUSEHOLD RECOMMENDATIONS
1. Use of a kitchen garbage disposal is not recommended. If a garbage disposal is utilized, kitchen wastewater
should be screened thoroughly. Many kitchen solids are not decomposed in the septic tank and may cause
increase tank pumping frequency.
2. Water use should be monitored, and plumbing leaks fixed immediately as this may generate up to 1,000
gallons per day, which may flood the system and cause a hydraulic overload of the STA.
3. Use of high efficiency water fixtures is recommended to decrease the hydraulic load on the OWTS system.
4. Do not irrigate the area on top of or directly adjacent to the STA as this may cause a hydraulic overload
of the STA.
5. Do not dispose of household waste down household drains as this may clog or damage the OWTS
components. Examples of household waste includes, but is not limited to: dental floss, cotton swabs,
coffee grounds, paper towels, feminine products, and many other kitchen or bath items, etc.
6. Do not dispose of household chemicals, greases, oils, paints, hot tub water, or water softener brine in
household drains. A separate drywell, if feasible, may be necessary for hot tub water or water softener
brine disposal.
7. Limit the use of bleach as this may harm the useful bacteria in the septic tank and STA.
8. Liquid dishwasher and clothes detergent is recommended for households using an OWTS. Clay substances
used as fillers in powder detergents may result in clogging of the STA.
MAINTENANCE
1. The effluent in septic tanks can freeze during extended period of non-use in cold weather. We recommend
that a tank heater be installed in this system to help prevent freezing.
2. Inspect the septic tank, vault filter, distribution box, treatment system, and soil treatment area at least
annually for problems or signs of failure.
3. The vault filter should be cleaned annually by spray washing solids into the first chamber of the septic
tank.
1335 cordillera Way
Project Number: 21-1184
[7]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
4. The septic tank should be pumped and cleaned every 3 to 5 years depending on use. Longer pumping
intervals may increase the amount of solids that reach the soil treatment area, which may shorten the life
span.
5. Pumping of the septic tank should take place when the level of the sludge and scum layers combined take
up 25 to 33% of the capacity of the first chamber of the tank.
LIMITATIONS
This study has been conducted in accordance with generally accepted engineering practices in this area for
exclusive use by the client for design purposes. Copying of this report or portions of this report without the
express written permission of Best Engineering Solutions and Technologies, LLC (BEST), is specifically
prohibited. We make no warranty either express or implied. The conclusions and recommendations submitted in
this report are based upon data obtained from the exploratory test pits at the locations indicated on Figure 2, soil
texture analysis, and the proposed construction. This report may not reflect subsurface variations that occur
between the explorations. The nature and extent of variations across the site may not become evident until site
grading and excavations are performed. If fill, soil, rock or water conditions appear to be different from those
described herein, BEST should be advised at once so that a re-evaluation of the recommendations presented in
this report can be made. BEST is not responsible for liability associated with interpretation of subsurface data
by others.
B.E.S.T. 189 14121-118410-2 BS01537818 36 46WSS= 0.0Type 2 Sandy loam12-6 BS0730 6 43 30 27 Type 2 Sandy loam10-1 BS01545 12 15 31 53 Type 2 Loam11-8 BS0845 10 5 30 65 Type 2 LoamTABLE: 1 Page 1 of 1 Matt@BestEngineeringUSA.com AS=Auger SampleST=Shelby TubeHD=Hand DriveC4=Pocket ValueSS=Split Spoon SampleLocations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com WSS=Water Soluble SulfatesRA=Radon Testing (pCi/L)pH = pH of soilAD=Air DriedCA=California SampleRM=Remolded SampleOR = Organic content of soilC2=Miniature CompressionC3=Pocket PenetrometerNOTE 2-Shear Strength TestsSoil DescriptionLL PIGRADATIONNOTE 3- Additional Test ResultsTT=Triaxial TestPT=ProctorAdditional Test Results (Note 3)CT=Consolidation Test% Swell and Consolidation% Sand -No. 4 +No. 200% Fines -No. 200https://bestengineeringusa.sharepoint.com/Shared Documents/Projects/21-1000 Summit Projects/2021 Archives/21-1184 1335 Cordillera Way/Calcs/[21-1184 1335TABLE 1.1SUMMARY OF LABORATORY TEST RESULTSPROJECT:LOCATION: SOURCE:PROJECT NO:Field Test Pit / Lab TestingDATE:1335 Cordillera WayEdwards, COJune 11, 2021Depth Sample Type (Note 1)ATTERBERG LIMITSPit No.BS=Bag SampleNat. Dry Density (PCF)Natural Moist. (%)NOTE 1- Sample TypeC1= Unconfined Compression% Gravel +No. 4
B.E.S.T. 21‐1184 Matt@BestEngineeringUSA.com SITE MAP Project Number Figure 1Locations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com NNot to Scale
B.E.S.T. 21‐1184 Matt@BestEngineeringUSA.com Locations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com PIT LOCATION LEGEND: TP‐1 – Indicates approximate location of exploratory pit Project Number Figure 2NNot to Scale
June 11, 202121-1184 1335Cordillera Way21-1184 1335 Cordillera WayEdwards, ColoradoLakewood Office:747 Sheridan Blvd, Unit 2ALakewood, CO 80214SEPTIC LAYOUTProject Location:SCALE: 124" = 1'-0"FIGURE: 5PROJECT NO:DRAWN BY: KMHREVIEWED BY: MABDATE:ProposedStructure25'ProposedStructureTP-1SEPTIC FIELDAND TANK AREACleanoutSepticTankDistributionBoxTP-2STA102'-3"28'115'-10"28'-10"Water LineProperty LineProperty Line
June 11, 2021
21-1184 1335
Cordillera Way
21-1184 1335 Cordillera Way
Edwards, Colorado
Lakewood Office:
747 Sheridan Blvd, Unit 2A
Lakewood, CO 80214
SOIL TREATMENT AREA
CALCULATIONS
Project Location:SCALE:
Vertical: NTS
Horizontal:NTS
FIGURE: 6PROJECT NO:
DRAWN BY: KMH
REVIEWED BY: MAB
DATE:
OWTS SOILS TREATMENT AREA CALCULATIONS
In accordance with the current Eagle County Onsite Wastewater Treatment Systems Regulations,
dated August 24, 2018, the absorption area was calculated as follows:
CALCULATION OF OWTS DESIGN FLOW
Q = (F)(B)(N), where:
Q = Design Flow
F = Average flow per person per day
B = Number of bedrooms
N = Number of persons per bedroom
F = 75 Gallons per day/Person
B = 4 Bedrooms
N = 2 Persons per bedroom x First 3 bedrooms + 1 Person for the additional 1 bedroom
Q = 525 Gallons per day
SEPTIC TANK CAPACITY
Septic tank should be listed as “Accepted for use in Colorado on-site wastewater treatment
systems.”
Minimum tank capacity = 1,250 gallons; Minimum first compartment capacity = 625 gallons (Per
Table 15.1)
CALCULATION OF OWTS TREATMENT AREA
Minimum soil treatment area (STA) = Q / Loam LTAR, Where:
Q = 525 Gallons per day
Type 2 Loam LTAR (Eagle County Table 10-1) = 0.6 Gallons/square foot/day
Minimum STA = 875 square feet
Adjustment factor for trenches, 1.0; for infiltrator chambers, 0.7 (Eagle County Table 10-2 and
10-3)
Required STA = Min. STA x trench adjustment x infiltrator adjustment
Required STA = 613 Square Feet
OWTS DESIGN TREATMENT AREA
Standard Chamber Trench Width 3 feet; Standard Chamber Length = 4 feet
Area per Chamber = 12 SF
Minimum Trench Separation = 4 feet
Minimum Number of Chambers = 613/ 12 = 52
Four Trenches with 13 chambers and 52 feet long, See Figure 6.
June 11, 2021
21-1184 1335
Cordillera Way
21-1184 1335 Cordillera Way
Edwards, Colorado
Lakewood Office:
747 Sheridan Blvd, Unit 2A
Lakewood, CO 80214
SOIL TREATMENT AREA
CALCULATIONS
Project Location:SCALE:
Vertical: NTS
Horizontal:NTS
FIGURE: 7PROJECT NO:
DRAWN BY: KMH
REVIEWED BY: MAB
DATE:
Inspection
Ports
N
Min. 4 Ft Spacing
between Trenches Typ.
Trench Width
3 Ft Typ.
SOIL TREATMENT AREA PLAN VIEW
Scale 132" = 1'-0"
Pipes,
SDR 35
Distribution Box
W/Equalizers
TRENCH 1: 13 Infiltration Chambers
TRENCH 2: 13 Infiltration Chambers
TRENCH 3: 13 Infiltration Chambers
52'
3'
4'24'
TRENCH 4: 13 Infiltration Chambers
SOIL TREATMENT AREA CROSS SECTION
Scale 12" = 1'-0"
12" Tall Infiltrator Chambers
Min. 12" Native Soil
Backfill - Do Not Compact
Native Loam
1/4" Perforations spaced at 4'
On-Center along bottom of pipe
4" Dia. Inspection Port
Lateral Pipe
Perforated
SDR 35
Scarify Soil 3" Below Level & Rake
Do Not Compact or Smear Trench Bottom
6" MIN
12"
12"
3' Max.
Infiltration Elev. 7,928 ft
SOIL TREATMENT AREA CROSS SECTION
Scale 14" = 1'-0"
Infiltration
Elev. 7,922 ft
Ground Surface Varies
Lateral Pipe,
Perforated
SDR 35
Lateral Pipe,
Perforated
SDR 35
Native Loam
Lateral Pipe,
Perforated
SDR 35
Max. 36"
Min. 12"Native Loam
Ground Surface Varies
Infiltration
Elev. 7,926 ft
Lateral Pipe,
Perforated
SDR 35
Native Loam
Infiltration
Elev. 7,928 ft
Infiltration
Elev. 7,924 ft
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
ONSITE WASTEWATER TREATMENT SYSTEM DESIGN
1335 CORDILLERA WAY
EDWARDS, COLORADO
81632
PROJECT NUMBER 21-1184
APRIL 29, 2021
REVISED MAY 7, 2021
PREPARED FOR
KEDROWSKI BUILDERS
BOB AND BARBARA KEDROWSKI
340 CORDILLERA WAY
EDWARDS, COLORADO
81632
Prepared By: Reviewed By:
Kamal M. Hasan, E.I.T. Matthew A. Best, P.E.
Staff Engineer Project Engineer
5/7/2021
Matthew Best Digitally signed by Matthew Best
Date: 2021.05.07 10:51:14 -06'00'
1335 cordillera Way
Project Number: 21-1184
[2]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
Table of Contents
PURPOSE AND SCOPE OF WORK ...................................................................................................................................................... 3
PROPOSED CONSTRUCTION.............................................................................................................................................................. 3
SITE CONDITIONS ................................................................................................................................................................................ 3
FIELD EXPLORATION ......................................................................................................................................................................... 3
SUBSURFACE CONDITIONS ............................................................................................................................................................... 3
OWTS ANALYSIS .................................................................................................................................................................................. 3
DESIGN RECOMMENDATIONS .......................................................................................................................................................... 3
SETBACKS ............................................................................................................................................................................................. 6
HOMEOWNER PRECAUTIONS ........................................................................................................................................................... 6
LIMITATIONS ........................................................................................................................................................................................ 7
FIGURE 1 –SITE MAP
FIGURE 2 – LOCATIONS OF EXPLORATORY TEST PITS
FIGURE 3 – TEST PITS LOGS
FIGURE 4 – LEGEND AND NOTES
FIGURE 5 – SEPTIC LAYOUT
FIGURE 6 – SOIL TREATMENT AREA CALCULATIONS
FIGURE 7 – SOIL TREATMENT AREA DETAILS
1335 cordillera Way
Project Number: 21-1184
[3]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
PURPOSE AND SCOPE OF WORK
This report presents the results of an onsite wastewater treatment system (OWTS) design for the project at 1335
cordillera Way in Eagle County, Colorado. The purpose of this report is to provide design details for an OWTS
in accordance with the 2018 Eagle County Onsite Wastewater Treatment System Regulations. The project site
is shown on Figure 1. Please refer to this report for subsurface information and recommendations.
PROPOSED CONSTRUCTION
We understand that the proposed residence will be a single-family home with an attached garage. The residence
will have four bedrooms. The home will be conventional wood frame construction.
If the number of bedrooms for the residence are different from those described above, we should be notified to
re-evaluate the recommendations contained in this report.
SITE CONDITIONS
At the time of our field exploration, the property consisted of vacant lot. The site is bounded by residential single-
family homes and undeveloped lots. The topography in the area slopes toward the north and east and is at an
approximate ranging elevation of 7,870 to 7,980 feet MSL.
FIELD EXPLORATION
Exploratory test pits were excavated on April 20, 2021, approximately at the locations shown on Figure 2 to
evaluate the soil treatment area (STA) subsurface conditions. The test pits were excavated with a mini-excavator
and logged by a representative of BEST. Samples of the soils were taken with disturbed sampling methods and
the depths of the samples are shown on the Test Pits Logs, Figure 3 and Legend and Notes, Figure 4.
SUBSURFACE CONDITIONS
TP-1 encountered native sandy loam to the maximum depth explored of 6 feet Below Existing Grade (BEG).
TP-2 encountered native loam to the maximum depth explored of 8 feet BEG. The soils encountered were slightly
moist to moist. Groundwater was not encountered at the time of the pits. Fluctuations in the groundwater levels
may occur seasonally or with precipitation events.
Samples taken from the exploratory test pits were retained for laboratory testing and inspected by the project
engineer. The results of the tests performed on the field samples are shown on Table 1. Laboratory testing
included index property tests, for moisture content and gradation analysis. The testing was performed on
disturbed bulk samples and were in general conformance with recognized test procedures, primarily, ASTM and
United States Department of Agriculture (USDA).
OWTS ANALYSIS
We recommend trench construction and infiltrator chambers be used to provide effluent treatment from the
proposed residence. The STA was sized for a maximum of four bedrooms, Type 2 soil with a Long-term
acceptance rate (LTAR) of 0.60, and TL1. Calculations are provided on Figure 6. The effluent will gravity flow
to the septic tank for primary treatment and gravity flow through a distribution box with equalizers to the STA
for final treatment.
DESIGN RECOMMENDATIONS
The design recommendations presented below are based on the proposed construction, the site, and subsurface
conditions encountered and our experience in this area. If conditions encountered during construction are
1335 cordillera Way
Project Number: 21-1184
[4]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
different than those that are described in this report, please contact us and we will re-evaluate our design
recommendations.
SOIL TREATMENT AREA
1. The treatment system will consist of four trenches, and 13 infiltration chambers long, see Table A below.
The trenches shall be a maximum width of 36-inches and shall be spaced at least 48-inches from trench
wall to trench wall. The STA was placed outside the former structure area which has been previously
removed.
2. The chambers shall be Quick4 Plus Standard infiltrator chambers, or an approved equivalent. Chambers
shall be installed in accordance with the manufacture’s recommendations and remain level across the
length of each set of chambers.
3. Topsoil within the proposed STA shall be stripped and removed prior to excavation of the trenches.
4. The maximum cut for the uphill side of the excavation shall be 3 feet to the infiltration surface. The base
excavation should be scarified prior to chamber placement.
5. A minimum 12 inches of cover soil should be placed over the geotextile. The soil cover may consist of
native sandy loam Type 1 or 2 materials.
6. Backfill should be graded to deflect surface water away from the STA and should be sloped at 3H:1V
maximum.
7. Disturbed soil should be re-vegetated as soon as possible with a native grass seed mixture. No trees,
shrubs, or other plants with deep roots should be planted on or near the STA as this may damage the
system.
8. Four-inch diameter inspection ports should be installed vertically into the beginning and end of each
trench. The inspection ports should extend at least 8 inches above the finished ground surface or be
protected in a valve box at finished grade. The portion that lies within the gravel layer should be perforated.
9. A plan view of the STA is presented on Figure 2 with a cross section view presented on Figure 5.
TABLE A – TRENCH CHAMBER SCHEDULE
Trench Number
Number of Chambers
Trench Length (ft)
Anticipated
Infiltration Elevation (ft)
Trench 1 13 52 7,922
Trench 2 13 52 7,924
Trench 3 13 52 7,926
Trench 4 13 52 7,928
OWTS COMPONENTS
Recommended OWTS components provided below are based on our design details and our experience with the
specific component manufacturers. Equivalent components may be feasible but need to be approved by us prior
to construction.
SEPTIC TANK
1. A minimum 1,250 gallon, two-chamber, precast septic tank is proposed for the OWTS. The first
compartment must be at least 625 gallons. The baffle or wall between the first and second compartments
must be properly sealed to prevent cross-compartment flow.
2. The tank must be set level. The bottom of the excavation shall be free of large rocks or other objects that
could damage the tank during placement. A gravel or road base bedding material may be necessary to
prevent tank damage during placement and act as a leveling course.
3. Tank shall be backfilled uniformly on all sides in lifts less than 24” and mechanically compacted.
4. Install tank with 2 feet minimum cover soil for frost protection. Maximum soils cover depth is 4 feet.
1335 cordillera Way
Project Number: 21-1184
[5]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
5. The septic lids must extend to final surface grade and made to be easily located.
6. An effluent filter shall be located prior to exiting the tank. The effluent filter shall be provided with a
handle located within 12-inches of the tank lid to allow for removal and cleaning of the screen.
SEWER PIPE
1. The sewer line from the residence to the septic tank should not be less than the diameter of the building
drain and not less than 4 inches in diameter.
2. Install cleanout pipes within 5 feet of the building foundations and if necessary, where the sewer pipe
bends 90 degrees or more and every 100 feet of sewer pipe.
3. The sewer pipe should have a rating of SDR35 or better. The sewer pipe should be sloped between 2%
and 4% to help limit disturbance of solids in the tank and potential sewage bypass of the first chamber of
the tank. If a steeper slope is necessary, this can be accomplished with vertical step-downs in the sewer
line, prior to the last 5 feet the tank.
4. A minimum of 36 inches of cover soil should be provided over the sewer pipe. Paved areas, patios, or
other areas without vegetative cover may be more susceptible to frost. We recommend a minimum of 48
inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with 2-
inch think blue foam insulation board. If adequate soil cover is not possible, we should be contacted for
re-evaluation prior to construction. If the sewer pipe passes under a paved area the pipe shall be SDR 35.
5. The sewer pipe should be bedded in compacted ¾-inch road base or native soils provided that the native
soils contain no angular rocks or rocks larger that 2.5-inches in diameter to help prevent settlement of the
pipe. Sags could cause standing effluent to freeze and damage piping.
6. All 90-degree bends should be installed using a 90-degree long sweep or by using two 45-degree elbows.
7. The sewer line location shown on Figure 2 is considered conceptual. We assume that there will be only
one sewer line exiting the residence. It is the responsibility of the owner to locate all sewer line exit
locations and connections to the septic tank. We should be notified if there are other sewer lines exiting
the residences.
EFFLUENT PIPING
1. We recommend a 3.0-inch diameter, solid, SDR 35 effluent distribution pipe that should be sloped at 2%
minimum to the distribution box and then to the drain field.
2. We recommend solid SDR 35 be used for the distribution pipes. The distribution pipes should be sloped
at 2% minimum to the drain field from the distribution box.
3. We recommend perforated SDR 35 be used for the lateral pipes. The lateral pipes should be attached close
to the chamber dome with an all-weather plastic pipe strap at every chamber connection.
4. The effluent distribution pipe should be bedded in compacted ¾-inch road base or native soils provided
that the native soils contain no angular rocks or rocks larger than 2.5-inches in diameter to help prevent
settlement of the pipe. Sags could cause standing effluent to freeze and damage piping.
5. A minimum of 24-inches of cover soil should be provided over the effluent piping. Paved areas, patios,
or other areas without vegetative cover may be more susceptible to frost. We recommend a minimum of
48 inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with
2-inch think blue foam insulation board. If adequate soil cover is not possible, we should be contacted for
re-evaluation prior to construction.
6. The effluent pipe should be double encased with larger diameter Schedule 40 PVC pipe underneath
driveway surfaces and be provided with a minimum of 48 inches of soil cover and be insulated on top and
sides with 2-inch-thick foam insulation board.
7. All 90-degree bends should be installed using a 90-degree long sweep or by using two 45-degree elbows.
1335 cordillera Way
Project Number: 21-1184
[6]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
SETBACKS
Below is a table of common minimum horizontal setbacks to OWTS components. Refer to the Eagle County
Regulations for a complete list of required setbacks. We recommend that OWTS components be surveyed by a
Professional Land surveyor licensed in Colorado and verified by BEST prior to the system permitting.
TABLE B – COMMON MINIMUM HORIZONTAL SETBACKS FROM OWTS COMPONENTS
Wells
Water
Supply
Line
Occupied
Dwelling
with
Basement
Property
Lines, or
Lined Ditch
Lake,
Irrigation Ditch,
Stream,
Wetland
Dry Ditch,
Gulch, or
Cut Bank
Septic
Tank
Absorption
Trenches
100’ 25’ 20’ 10’ 50’ 25’ 5’
Septic Tank 50’ 10’ 5’ 10’ 50’ 10’ -
Building Sewer
Lines
50’ 5’ 0’ 10’ 50’ 10’ -
HOMEOWNER PRECAUTIONS
The OWTS will require periodic inspection and maintenance to function properly. A properly designed, installed,
and maintained system can greatly increase its lifespan. The level of maintenance will vary depending on the
complexity of the system and water use habits of the residents. Below are some basic recommendations for the
OWTS operation and maintenance.
HOUSEHOLD RECOMMENDATIONS
1. Use of a kitchen garbage disposal is not recommended. If a garbage disposal is utilized, kitchen wastewater
should be screened thoroughly. Many kitchen solids are not decomposed in the septic tank and may cause
increase tank pumping frequency.
2. Water use should be monitored, and plumbing leaks fixed immediately as this may generate up to 1,000
gallons per day, which may flood the system and cause a hydraulic overload of the STA.
3. Use of high efficiency water fixtures is recommended to decrease the hydraulic load on the OWTS system.
4. Do not irrigate the area on top of or directly adjacent to the STA as this may cause a hydraulic overload
of the STA.
5. Do not dispose of household waste down household drains as this may clog or damage the OWTS
components. Examples of household waste includes, but is not limited to: dental floss, cotton swabs,
coffee grounds, paper towels, feminine products, and many other kitchen or bath items, etc.
6. Do not dispose of household chemicals, greases, oils, paints, hot tub water, or water softener brine in
household drains. A separate drywell, if feasible, may be necessary for hot tub water or water softener
brine disposal.
7. Limit the use of bleach as this may harm the useful bacteria in the septic tank and STA.
8. Liquid dishwasher and clothes detergent is recommended for households using an OWTS. Clay substances
used as fillers in powder detergents may result in clogging of the STA.
MAINTENANCE
1. The effluent in septic tanks can freeze during extended period of non-use in cold weather. We recommend
that a tank heater be installed in this system to help prevent freezing.
2. Inspect the septic tank, vault filter, distribution box, treatment system, and soil treatment area at least
annually for problems or signs of failure.
3. The vault filter should be cleaned annually by spray washing solids into the first chamber of the septic
tank.
1335 cordillera Way
Project Number: 21-1184
[7]
Locations: Summit County & Lakewood, Colorado Psalm 20 Phone: 970.409.9670 Matt@BestEngineeringUSA.com
Mailing: 747 Sheridan Boulevard, Unit 2A Lakewood, Colorado 80211 Phone: 303.238.1770 Office@BestEngineeringUSA.com
B.E.S.T.
4. The septic tank should be pumped and cleaned every 3 to 5 years depending on use. Longer pumping
intervals may increase the amount of solids that reach the soil treatment area, which may shorten the life
span.
5. Pumping of the septic tank should take place when the level of the sludge and scum layers combined take
up 25 to 33% of the capacity of the first chamber of the tank.
LIMITATIONS
This study has been conducted in accordance with generally accepted engineering practices in this area for
exclusive use by the client for design purposes. Copying of this report or portions of this report without the
express written permission of Best Engineering Solutions and Technologies, LLC (BEST), is specifically
prohibited. We make no warranty either express or implied. The conclusions and recommendations submitted in
this report are based upon data obtained from the exploratory test pits at the locations indicated on Figure 2, soil
texture analysis, and the proposed construction. This report may not reflect subsurface variations that occur
between the explorations. The nature and extent of variations across the site may not become evident until site
grading and excavations are performed. If fill, soil, rock or water conditions appear to be different from those
described herein, BEST should be advised at once so that a re-evaluation of the recommendations presented in
this report can be made. BEST is not responsible for liability associated with interpretation of subsurface data
by others.
B.E.S.T. 175 12721-118410-2 BS01537818 36 46WSS= 0.0Type 2 Sandy loam12-6 BS0730 6 43 30 27 Type 2 Sandy loam10-1 BS01545 12 15 31 53 Type 2 Loam11-8 BS0845 10 5 30 65 Type 2 LoamTABLE: 1 Page 1 of 1 Matt@BestEngineeringUSA.com Depth Sample Type (Note 1)ATTERBERG LIMITSPit No.BS=Bag SampleNat. Dry Density (PCF)Natural Moist. (%)NOTE 1- Sample TypeC1= Unconfined Compressionhttps://bestengineeringusa.sharepoint.com/Shared Documents/Projects/21-1000 Summit Projects/21-1184 1335 Cordillera Way/Calcs/[21-1184 1335 Cordillera WayTABLE 1.1SUMMARY OF LABORATORY TEST RESULTSPROJECT:LOCATION: SOURCE:PROJECT NO:Field Test Pit / Lab TestingDATE:1335 Cordillera WayEdwards, COMay 7, 2021% Gravel +No. 4Additional Test Results (Note 3)CT=Consolidation Test% Swell and Consolidation% Sand -No. 4 +No. 200% Fines -No. 200C2=Miniature CompressionC3=Pocket PenetrometerNOTE 2-Shear Strength TestsSoil DescriptionLL PIGRADATIONNOTE 3- Additional Test ResultsTT=Triaxial TestPT=ProctorWSS=Water Soluble SulfatesRA=Radon Testing (pCi/L)pH = pH of soilAD=Air DriedCA=California SampleRM=Remolded SampleOR = Organic content of soilSS=Split Spoon SampleLocations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com AS=Auger SampleST=Shelby TubeHD=Hand DriveC4=Pocket Value
B.E.S.T. 21‐1184 Matt@BestEngineeringUSA.com SITE MAP Project Number Figure 1Locations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com NNot to Scale
B.E.S.T. 21‐1184 Matt@BestEngineeringUSA.com Project Number Figure 2Mailing: 747 Sheridan Boulevard, Unit 2A ● Lakewood, Colorado 80211● Phone: 303.238.1770 ●Office@BestEngineeringUSA.com PIT LOCATION LEGEND: TP‐1 – Indicates approximate location of exploratory pitLocations: Summit County & Lakewood, Colorado ● Psalm 20 ● Phone: 970.409.9670 ●NNot to Scale
May 7, 202121-1184 1335Cordillera Way21-1184 1335 Cordillera WayEdwards, ColoradoLakewood Office:747 Sheridan Blvd, Unit 2ALakewood, CO 80214SEPTIC LAYOUTProject Location:SCALE: 132" = 1'-0"FIGURE: 5PROJECT NO:DRAWN BY: KMHREVIEWED BY: MABDATE:ProposedStructureTP-1SEPTIC FIELDAND TANK AREACleanoutSepticTankDistributionBoxTP-2STANProposedStructure25'
May 7, 2021
21-1184 1335
Cordillera Way
21-1184 1335 Cordillera Way
Edwards, Colorado
Lakewood Office:
747 Sheridan Blvd, Unit 2A
Lakewood, CO 80214
SOIL TREATMENT AREA
CALCULATIONS
Project Location:SCALE:
Vertical: NTS
Horizontal:NTS
FIGURE: 6PROJECT NO:
DRAWN BY: KMH
REVIEWED BY: MAB
DATE:
OWTS SOILS TREATMENT AREA CALCULATIONS
In accordance with the current Eagle County Onsite Wastewater Treatment Systems Regulations,
dated August 24, 2018, the absorption area was calculated as follows:
CALCULATION OF OWTS DESIGN FLOW
Q = (F)(B)(N), where:
Q = Design Flow
F = Average flow per person per day
B = Number of bedrooms
N = Number of persons per bedroom
F = 75 Gallons per day/Person
B = 4 Bedrooms
N = 2 Persons per bedroom x First 3 bedrooms + 1 Person for the additional 1 bedroom
Q = 525 Gallons per day
SEPTIC TANK CAPACITY
Septic tank should be listed as “Accepted for use in Colorado on-site wastewater treatment
systems.”
Minimum tank capacity = 1,250 gallons; Minimum first compartment capacity = 625 gallons (Per
Table 15.1)
CALCULATION OF OWTS TREATMENT AREA
Minimum soil treatment area (STA) = Q / Loam LTAR, Where:
Q = 525 Gallons per day
Type 2 Loam LTAR (Eagle County Table 10-1) = 0.6 Gallons/square foot/day
Minimum STA = 875 square feet
Adjustment factor for trenches, 1.0; for infiltrator chambers, 0.7 (Eagle County Table 10-2 and
10-3)
Required STA = Min. STA x trench adjustment x infiltrator adjustment
Required STA = 613 Square Feet
OWTS DESIGN TREATMENT AREA
Standard Chamber Trench Width 3 feet; Standard Chamber Length = 4 feet
Area per Chamber = 12 SF
Minimum Trench Separation = 4 feet
Minimum Number of Chambers = 613/ 12 = 52
Four Trenches with 13 chambers and 52 feet long, See Figure 6.
May 7, 2021
21-1184 1335
Cordillera Way
21-1184 1335 Cordillera Way
Edwards, Colorado
Lakewood Office:
747 Sheridan Blvd, Unit 2A
Lakewood, CO 80214
SOIL TREATMENT AREA
CALCULATIONS
Project Location:SCALE:
Vertical: NTS
Horizontal:NTS
FIGURE: 7PROJECT NO:
DRAWN BY: KMH
REVIEWED BY: MAB
DATE:
N
Min. 4 Ft Spacing
between Trenches Typ.
Trench Width
3 Ft Typ.
SOIL TREATMENT AREA PLAN VIEW
Scale 132" = 1'-0"
Pipes,
SDR 35
Distribution Box
W/Equalizers
TRENCH 1: 13 Infiltration Chambers
TRENCH 2: 13 Infiltration Chambers
TRENCH 3: 13 Infiltration Chambers
52'
3'
4'24'
TRENCH 4: 13 Infiltration Chambers
SOIL TREATMENT AREA CROSS SECTION
Scale 12" = 1'-0"
12" Tall Infiltrator Chambers
Min. 12" Native Soil
Backfill - Do Not Compact
Native Loam
1/4" Perforations spaced at 4'
On-Center along bottom of pipe
4" Dia. Inspection Port
Lateral Pipe
Perforated
SDR 35
Scarify Soil 3" Below Level & Rake
Do Not Compact or Smear Trench Bottom
6" MIN
12"
12"
3' Max.
Infiltration Elev. 7,928 ft
SOIL TREATMENT AREA CROSS SECTION
Scale 14" = 1'-0"
Infiltration
Elev. 7,922 ft
Ground Surface Varies
Lateral Pipe,
Perforated
SDR 35
Lateral Pipe,
Perforated
SDR 35
Native Loam
Lateral Pipe,
Perforated
SDR 35
Max. 36"
Min. 12"Native Loam
Ground Surface Varies
Infiltration
Elev. 7,926 ft
Lateral Pipe,
Perforated
SDR 35
Native Loam
Infiltration
Elev. 7,928 ft
Infiltration
Elev. 7,924 ft
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