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HomeMy WebLinkAbout1360 Cordillera Wy - 210712103010Environmental Health
Department
P.O. Box 179
500 Broadway
Eagle, CO 81631-0179
Phone: (970) 328-8730
Fax: (970) 328-7185
Permit
Permit No. OWTS-017483-2019
Permit Type: OWTS Permit
Work Classification: New
Permit Status: Expired
Issue Date: 9/25/2019 Expires: 1/11/2021
On-Site Wastewater
Treatement System
Project Address Parcel Number
1360 CORDILLERA WY, EDWARDS AREA,210712103010
Owner Information Address
Carpenter Kenyon PO Box 2459
Edwards, 81632
Phone: (214) 507-6777
Cell: (214) 507-6777
Email: ckenyon1114@gmail.com
Inspections:
For Inspections Call: (970) 328-8755
and call the Design Engineer
Engineer Phone Email
KUMAR & ASSOCIATES, Dave Young (970) 945-7988 dyoung@kumarusa.com
Contractor License Number Phone Email
Shoup Land Development judshoup@hotmail.com(970) 376-3704OWTSPL-000069-20
20
Permitted Construction / Details:
Install the OWTS exactly as depicted in the Kumar & Associates, Inc design dated August 5, 2019, signed, stamped,
and dated August 6, 2019 by David A. Young, PE. The system is designed to serve a four bedroom single family
residence.
The OWTS system consists of a 1,500 gallon Valley Precast three-compartment septic tank (2,000 gallon total
capacity) with a Orenco PF3005 submersible pump enclosed in an Orenco Biotube Pump Vault, set floats to deliver
approximately 100 gallons of effluent and maximum distance of 60 feet to the manifold of the mounded soil
treatment area (STA). The STA consists of two rows of 20 Infiltrator Quick4 Plus Low Profile chambers set atop a
minimum of 18 inches of secondary sand filter, 6 feet wide by 80 feet long. Install inspection ports as depicted, in all
four corners of the distribution cell sand filter. The sand filter is to be placed over a 5,120 square foot basal area, 106
foot wide and 70 feet long, including the 3:1 slope. Be sure to rake the natural ground surface prior to placing sand
filter media.
Note: Gradation of the sand media use must be completed within one month prior to the installation and confirmed
with the design engineer. If the sand does not conform to secondary or preferred sand media requirements, it
cannot be use for the sand treatment media.
Contact Eagle County Environmental Health and the design engineer well in advance of requesting inspections prior
to backfilling any component of the OWTS. The design engineer is responsible for conducting all inspections
necessary to certify the installation and assure functionality of the system. System certification, along with photos,
gradation analysis and a record drawing is required to be submitted to, and approved by, Eagle County
Environmental Health prior to the use of the system or occupancy of the dwelling.
THIS PERIMT EXPIRES BY TIME LIMITATION AND BECOMES NULL AND VOID IF THE WORK AUTHORIZED BY THE PERMIT IS NOT COMMENCED WITHIN 120 DAYS OF
ISSUANCE, OR BEFORE THE EXPIRATION OF AN ASSOCIATED BUILDING PERMIT
Issued by: Environmental Health Department, Eagle County, CO
Claire Lewandowski
Date
September 25, 2019
CONDITIONS
1.
2.ALL INSTALLATIONS MUST COMPLY WITH ALL REQUIREMENTS OF THE EAGLE COUNTY PUBLIC HEALTH AGENCY ON-SITE WASTEWATER TREATMENT SYSTEM
REGULATIONS ADOPTED PURSUANT TO AUTHORITY GRANTED IN CR.S. 25-10-101, et seq., AS AMENDED
3.THIS PERMIT IS VALID ONLY FOR PERFORMING WORK ON OWTS ASSOCIATED WITH STRUCTURES WHICH HAVE FULLY COMPLIED WITH COUNTY ZONING AND
BUILDING REQUIREMENTS CONNECTION TO, OR USE WITH, ANY DWELLING OR STRUCTURE NOT APPROVED BY THE ZONING AND BUILDING DEPARTMENTS
SHALL AUTOMATICALLY BE A VIOLATION OF A REQUIREMENT OF THE PERMIT AND WILL RESULT IN BOTH LEGAL ACTION AND REVOCATION OF THE PERMIT
4.1.6(A)(1) EAGLE COUNTY PUBLIC HEALTH AGENCY ON-SITE WASTEWATER TREATMENT SYSTEM REGULATIONS REQUIRES ANY PERSON WHO CONSTRUCTS,
ALTERS OR INSTALLS AN ON-SITE WASTEWATER TREATMENT SYSTEM TO BE LICENSED
Thursday, September 24, 2020 1
17483-2019
73260
17169-2019
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-516530-2022 Permit Number: OWTS-017483-2019
Inspection Date: 08/23/2022
Inspector:
Permit Type: OWTS Permit
Inspection Type: OWTS Final Inspection
Work Classification: NewOwner:Carpenter Kenyon
Job Address:1360 CORDILLERA WY IVR Pin Number:189021
EDWARDS AREA, CO Project:<NONE>
Parcel Number:210712103010
Contractor:Phone: (970) 376-3704 / Cell: (970) 376-3704Shoup Land Development
Inspection Status: Approved
Inspection Notes
Inspector Comments
Added Item: Septic Tank
Inspected 7/29/2022. A Valley Precast 1,500 gallon three chamber concrete tank was installed with a
pump in the third chamber.
Added Item: Record Drawing
Received 8/18/2022 from Kumar & Associates.
Added Item: Record Photos
Received 8/18/2022 from Kumar & Associates.
Added Item: Site and Soil
Inspected 7/29/2022. Received 9/24/2019 from Kumar & Associates.
Added Item: Final Certification Letter
Received 8/18/2022 from Kumar & Associates.
Added Item: General Plan
Received 9/24/2019 from Kumar & Associates.
Added Item: Soil Treatment Area (STA)
Inspected 7/29/2022. 2 rows of 20 Infiltrator Quick4 Plus Standard low profile chambers.
Added Item: Identification of Systems Contractor
Shoup Land Development was the licensed installer.
Tuesday, August 23, 2022
For more information visit: http://www.eaglecounty.us
Page 1 of 2
Tuesday, August 23, 2022
For more information visit: http://www.eaglecounty.us
Page 2 of 2
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
August 15, 2022
Highline Homes
Attn: Tyler Aldrich
P.O. Box 661
Wolcott, Colorado 81655
tyler@treelinecohomes.com
Project No. 19-7-198.03
Permit No. OWTS-017483-2019
Subject: Certification of Onsite Wastewater Treatment System, Proposed Kenyon/
Carpenter Residence, Lot 21, Filing 2, Divide at Cordillera, 1360 Cordillera Way,
Eagle County, Colorado
Dear Tyler:
A representative of Kumar & Associates observed the installation of the Onsite Wastewater
Treatment System (OWTS) for the residence at the subject site as required by the Eagle County
Environmental Health Department. Our observations and recommendations are presented in this
report. The services are supplemental to Kumar & Associates agreement for professional
services to Pinnacle Construction dated March 28, 2019.
We previously designed the OWTS for the residence as submitted in our report dated August 5,
2019, Project No. 19-7-198.02. The system was designed for four bedrooms. The OWTS was
installed by Shoup Land Development under Permit No. OWTS-017483-2019.
We performed our as-built evaluations on October 23 and 30, 2020, May 28, 2021 and August 2,
2022. The OWTS components observed included: sewer line, cleanout, septic tank, effluent line,
pump, control panel and soil treatment area (STA) and the locations of these components. The
installation and locations of the system components were verified as shown on Figure 1. Pictures
of the OWTS components made during the site visits are included with this report. Additional
pictures were provided by the installer as noted on the photograph log. The distance locations to
the septic tank shown on Figure 1 were made by taping.
On October 30, 2020, a sample of the secondary sand media was obtained and the results of
gradation analysis test are attached. On August 2, 2022, after power had been supplied to the
pump, a pump performance test was performed with adequate pump pressure observed.
It is our opinion that the OWTS was installed in general conformance with the above referenced
design.
The observations and recommendations presented above are based on our site observations and
our experience in the area. We make no warranty either express or implied. Alterations to the
Kumar & Associates
GRADATION ANALYSIS TEST
LABORATORY TEST REPORT DATA
Laboratory
Client:
Location / Plant:
Sample / Product:
Sample Date:
Lab Test Date:
Job Number:
SIEVE SIEVE OPENING IN
MILLIMETERS
PERCENT
PASSING THRU
SIEVE
3"75 100.0
1.5 37.5 100.0
3/4"19 100.0
3/8"9.5 100.0
No. 4 4.75 100.0
No. 8 2.36 82.0
No. 16 1.18 66.0
No. 30 0.6 42.0
No. 50 0.3 19.0
No. 100 0.15 5.0
No. 200 0.075 1.8
GRADATION RESULTS COMPARED TO PREFERRED AND SECONDARY SAND FILTER SPECIFICATIONS
Value Units
Preferred
Sand Value
Pass / Fail
Preferred
Sand
Secondary
Sand Value
Pass / Fail
Secondary
Sand
1.04 millimeters
0.204 millimeters 0.25 to 0.60 FAIL 0.15 to 0.60 PASS
5.08 unitless ratio < or = 4.0 FAIL < or = 7.0 PASS
1.8 millimeters < or = 3 PASS < or = 3 PASS
Uniformity Coefficient (D60 / D10)
Percent passing thru #200 Sieve
10/30/2020
19-7-198.03
Parameter
D60 - Diameter that 60 percent of the sample is
finer than.
Effective Size - D10 - Diameter that 10 percent
of the sample is finer than.
Kumar GWS
Highline Homes
United
Sand Filter
10/30/2020
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100Percent Passing SieveDiameter of Particle in Millimeters
Plot of Gradation Analysis
3"1.5"3/4"3/8"#4#8#30#50#100#200 #16
Z:\2019 Jobs\19-7-198.03\Sand Gradation Analysis Spreadsheet.xlsx
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 21, FILING 2, DIVIDE AT CORDILLERA
1360 CORDILLERA WAY
EAGLE COUNTY, COLORADO
Project No. 19-7-198.03
Photograph 1: Sewer line
exiting residence and cleanout.
Photograph 2: Entering septic
tank.
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 21, FILING 2, DIVIDE AT CORDILLERA
1360 CORDILLERA WAY
EAGLE COUNTY, COLORADO
Project No. 19-7-198.03
Photograph 3: Valley Precast
1,500-gallon, 3-chamber septic
tank.
Photograph 4: 1.5” Schedule 40
effluent transport line exiting
septic tank to soil treatment area
(STA). (Provided by installer)
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 21, FILING 2, DIVIDE AT CORDILLERA
1360 CORDILLERA WAY
EAGLE COUNTY, COLORADO
Project No. 19-7-198.03
Photograph 5: Soil treatment
area (STA) with observation
ports installed and cleanouts.
(Provided by installer)
Photograph 6: Sand filter
placed in the basal area.
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 21, FILING 2, DIVIDE AT CORDILLERA
1360 CORDILLERA WAY
EAGLE COUNTY, COLORADO
Project No. 19-7-198.03
Photograph 7: Pump installed
in the third chamber of the septic
tank.
Photograph 8: Control panel.
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
ONSITE WASTEWATER TREATMENT SYSTEM DESIGN
PROPOSED KENYON/CARPENTER RESIDENCE
LOT 21, FILING 2, DIVIDE AT CORDILLERA
1360 CORDILLERA WAY
EAGLE COUNTY, COLORADO
PROJECT NO. 19-7-198.02
AUGUST 5, 2019
PREPARED FOR:
PINNACLE CONSTRUCTION
ATTN: DAVID PETERSON
96 LADY BELLE PLACE
EDWARDS, COLORADO 81632
(pinnacledwp@gmail.com)
Kumar & Associates, Inc. ® Project No. 19-7-198.02
TABLE OF CONTENTS
INTRODUCTION ........................................................................................................... - 1 -
PROPOSED CONSTRUCTION ..................................................................................... - 1 -
SITE CONDITIONS ....................................................................................................... - 1 -
SUBSURFACE CONDITIONS ...................................................................................... - 2 -
OWTS ANALYSIS ......................................................................................................... - 3 -
DESIGN RECOMMENDATIONS ................................................................................. - 3 -
SOIL TREATMENT AREA ....................................................................................... - 3 -
OWTS COMPONENTS .............................................................................................. - 5 -
OWTS OPERATION AND MAINTENANCE .............................................................. - 8 -
OWTS HOUSEHOLD OPERATION ......................................................................... - 8 -
OWTS MAINTENANCE ........................................................................................... - 9 -
OWTS CONSTRUCTION OBSERVATION ............................................................... - 10 -
LIMITATIONS ............................................................................................................. - 10 -
FIGURE 1 OWTS SITE PLAN
FIGURE 2 SOIL TREATMENT AREA CALCULATIONS
FIGURE 3 SOIL TREATMENT AREA PLAN VIEW
FIGURE 4 SOIL TREATMENT AREA CROSS SECTION
FIGURE 5 CLEANOUT DETAIL
ATTACHMENTS
VALLEY PRECAST SEPTIC TANK DETAIL
ORENCO PF3005 EFFLUENT PUMP CURVE
Kumar & Associates, Inc. ® Project No. 19-7-198.02
INTRODUCTION
This report provides the results of an onsite wastewater treatment system (OWTS) design for the
proposed Kenyon/Carpenter residence to be located on Lot 21, Filing 2, Divide at Cordillera,
1360 Cordillera Way, Eagle County, Colorado. The purpose of this report was to provide design
details for the OWTS in accordance with the 2018 Eagle County Onsite Wastewater Treatment
System Regulations and the Colorado Department of Public Health and Environment’s
Regulation #43. The study was performed as part of our agreement for geotechnical engineering
services to Pinnacle Construction dated March 28, 2019. We previously prepared a subsoil study
for foundation design of the residence and submitted our findings in a report dated May 20,
2019, Project No. 19-7-198.
PROPOSED CONSTRUCTION
The residence will be a four-bedroom, two-story structure over a partial walkout basement with
an attached garage on the lot as shown on Figure 1. Ground floor will be partially over
crawlspace and partially slab-on-grade. The proposed OWTS soil treatment area (STA) will be
located to the southeast of the residence. Water service will be provided to the residence by the
public water supply from Cordillera Way.
If proposed construction is different than that described, we should be contacted to re-evaluate
our design recommendations.
SITE CONDITIONS
The lot was vacant at the time of field exploration and the ground surface appeared mostly
natural. The proposed residence is on a low hilltop with strongly sloping to moderately steep
slopes down from the residence site. The terrain at the planned STA slopes moderately steeply
down to the southeast at grades from about 20 to 25%. Vegetation consists of grass, weeds,
brush with scattered juniper trees. No surface water features were observed in the near vicinity
of the lot. We are not aware of any nearby water wells.
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Kumar & Associates, Inc. ® Project No. 19-7-198.02
SUBSURFACE CONDITIONS
The field exploration for the OWTS was conducted on July 23, 2019. Two profile pits (Profile
Pits 1 and 2) were excavated with a medium sized trackhoe at the approximate locations shown
on Figure 1 to evaluate the subsurface conditions. The pits were logged by a representative of
Kumar & Associates. Logs of the profile pits are provided below.
Log of Profile Pit 1
Depth USDA Classification
0-½’ TOPSOIL; Loam with organics, loose, slightly moist, brown.
½’-2’ GRAVELLY SILTY CLAY LOAM; massive structure, stiff, slightly moist, brown
to reddish brown.
2’-5’ WEATHERED SILTSTONE BEDROCK; medium hard to hard, slightly moist,
reddish brown.
• Practical digging refusal in bedrock @ 5 feet.
• Bottom of pit @ 5 feet.
• No free water or redoximorphic features observed at time of excavation.
Log of Profile Pit 2
Depth USDA Classification
0-1’ TOPSOIL; Loam with organics, loose, slightly moist, brown.
1’-1½’ SILTY CLAY LOAM; massive structure, stiff, slightly moist, brown.
1½’-6’ WEATHERED SILTSTONE BEDROCK; medium hard to hard, slightly moist,
grayish brown.
• Practical digging refusal in bedrock @ 6 feet.
• Bottom of pit @ 6 feet.
• No free water or redoximorphic features observed at time of excavation.
The soils encountered consisted of about ½ to 1 foot of organic topsoil overlying ½ to 1½ feet of
Silty Clay Loam to Gravelly Silty Clay Loam underlain by Weathered Siltstone Bedrock to the
depths explored of 5 and 6 feet. Based on the subsurface conditions, the near surface soils have
been classified as Soil Type 3A per State regulations, which equates to a long-term acceptance
rate (LTAR) of 0.30 gallons per square foot per day at treatment level 1 (TL1). No free water
was encountered in the pits at the time of excavation and no indications of seasonal high
groundwater were observed in the soil profiles.
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Kumar & Associates, Inc. ® Project No. 19-7-198.02
OWTS ANALYSIS
Based on the site conditions and profile pit evaluations, the site will require a mounded sand
STA to provide adequate treatment of the effluent from the residence. Bedrock is present at
about 1½ feet in depth and the sand filter is needed due to shallow bedrock. The sand filter will
be a minimum of 18 inches thick to maintain 3 feet of soil separation to the bedrock. The system
will consist of chambers in a bed configuration. The STA bed will be sized for four bedrooms
(seven persons total) using an LTAR of 0.8 gallons per square foot per day for the imported
“secondary sand media”. The STA basal area of the sand will be sized for Soil Type 3A and
TL1 for an LTAR of 0.30 gallons per square foot per day.
The sewage will gravity flow from the residence to the septic tank for primary treatment then be
pressured dosed on a regular basis to the STA for dispersal and final treatment. Pressure dosing
is necessary for the vertical separation to bedrock and for the mounded sand system.
DESIGN RECOMMENDATIONS
The design recommendations presented below are based on the proposed construction, the site
and subsurface conditions encountered, and our experience in the area. If conditions
encountered during construction are different than those that are described in this report, please
contact us to re-evaluate our design recommendations.
SOIL TREATMENT AREA
• The STA will be a distribution cell consisting of 2 rows of 20 Infiltrator Quick4 Plus
Standard Low Profile chambers in a bed configuration installed over a minimum 18
inches thick mounded sand filter. A pressure distribution system will be used to dose the
effluent to the STA at regular intervals.
• The distribution cell was sized based on an LTAR of 0.80 gallons per square foot per day
for secondary sand media and a linear loading rate (LLR) of 4.8 gallons per day per linear
foot. The basal area of the STA was sized on an LTAR of 0.30 pre square foot per day
for Soil Type 3A and TL1.
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Kumar & Associates, Inc. ® Project No. 19-7-198.02
• A 30% reduction of the STA size was applied for use of Infiltrator chambers in a bed
configuration.
• The minimum bed dimensions with reductions are 6 feet wide by 77 feet long (462
square feet). The bed dimensions will be 6 feet wide by 80 feet long (480 square feet).
• The minimum basal width is 16 feet. The minimum basal area is 1,280 square feet. Due
to the slope of the site, the basal width is estimated to be 64 feet for a total basal area of
5,120 square feet (see Figure 4).
• Soil treatment area calculations are shown on Figure 3.
• Vegetation should be removed and the ground surface under the STA basal area scarified
prior to sand filter placement.
• Sand filter material should extend one foot horizontally from the edges of the Infiltrators
and then be sloped at 3 Horizontal:1 Vertical (3H:1V) maximum in all directions.
• The sand filter media should meet the requirements of the current Eagle County OWTS
Regulations for “secondary sand media”. ASTM C33 concrete sand is suitable. A
sample of the sand should be obtained with about 1 month prior to installation for
gradation analysis with the sample provided to us for testing or the test results provided
to us for approval of the material.
• The sand filter material shall be placed in lifts not exceeding 10 inches thick. Each lift
shall be track or bucket compacted until settlement ceases.
• Distribution lines, consisting of 1.5-inch diameter, Schedule 40 piping, with ⅛-inch
orifice holes drilled at 4-foot centers near the center of the chambers, should be installed
along the complete length of the chambers, see Figure 4. The distribution lines should be
suspended approximately 2 inches from the top surface of the chambers by pipe ties. The
orifice holes should face up toward the chamber surface above.
• A ⅛-inch hole should be drilled on the bottom of each end of the distribution pipe to
allow for complete drainage of the distribution line following pressure dosing. Install
splash plates below drain holes.
• The bed should be oriented along ground contours to minimize soil cover.
• A minimum of 10 inches and a maximum of 24 inches of cover soil should be placed
over the chambers and sand filter media.
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Kumar & Associates, Inc. ® Project No. 19-7-198.02
• Backfill should be graded to deflect surface water away from the STA and should be
sloped at 3 Horizontal:1 Vertical (3H:1V) maximum in all directions. This may require a
ground surface swale along the up-slope side.
• Disturbed ground should be re-vegetated as soon as possible with a native grass mix. No
trees, shrubs or other plants with deep roots should be planted on or near the STA as this
may damage the s ystem piping.
• Four-inch diameter inspection ports should be installed vertically into the knockouts of
the Infiltrator endcaps at each corner of the bed. The inspection port piping should be
screwed into the top to the chambers and should not extend down to the ground surface
inside the chambers. The inspection ports should extend at least 8 inches above the
finished ground surface or be protected in a valve box at finished grade.
• A plan view of the STA is presented on Figure 3 and a cross section of the STA is
presented on Figure 4.
• Cleanouts must be installed at the end of each of the distribution line in the STA. A
typical cleanout detail is provided on Figure 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
• A Valley Precast 1,500 gallon, three-chamber septic tank (2,000 gallons total) will be
used for primary treatment and dosing to the STA. The first two chambers of the tank
will be utilized for treatment and settling, and the third chamber of the tank will contain
the dosing pump. A detail of the tank is provided as an attachment to the report.
• A submersible effluent pump enclosed in a Biotube Pump Vault will be installed in the
third chamber. A copy of the septic detail is provided as an attachment to this report.
• The tank must be a minimum of five feet from the residence and from the STA. The tank
must be a minimum of 10 feet from any potable water supply lines.
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Kumar & Associates, Inc. ® Project No. 19-7-198.02
• The tank must be set level. The excavation bottom must be free of large rocks or other
objects that could damage the tank during placement. A road base or gravel bedding
material will likely be needed to prevent tank damage during placement and act as a
leveling course.
• The tank lids must extend to final surface grade and made to be easily located.
• Install the tank with 2 feet minimum cover soil for frost protection. Maximum tank soil
cover is 4 feet.
Sewer Pipe
• The sewer line to the septic tank should not be less than the diameter of the building
drains and not less than 4 inches in diameter.
• The sewer pipes should have a rating of SDR35 or stronger.
• The sewer pipe should be sloped between 2% to 4% to help limit disturbance of solids in
the tank and potential sewage bypass of the first chamber of the tank. If a steeper slope is
needed, this can be accomplished with vertical step-downs in the sewer line.
• A minimum 36 inches of cover soil should be provided over the sewer pipes. Paved
areas, patios or other areas without vegetative cover may be more susceptible to frost.
We recommend 48 inches of soil cover over the sewer pipe in these areas and the pipe be
insulated on top and sides with 2-inch-thick blue foam insulation board. If adequate soil
cover is not possible, we should be contacted for re-evaluation prior to installation.
• The sewer pipe should be bedded in compacted ¾ inch road base or native soils provided
that the native soils contain no angular rocks or rocks larger than 2½ inches in diameter
to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and
damage piping.
• Install cleanout pipes within 5 feet of the building foundations, where the sewer pipes
bend 90 degrees or more and every 100 feet of sewer pipe.
• All 90-degree bends should be installed using a 90-degree long-sweep or by using two
45-degree elbows.
• The sewer line location shown on Figure 1 is considered conceptual. We assume that
there will be only one sewer line exiting the residence. It is the responsibility of the
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Kumar & Associates, Inc. ® Project No. 19-7-198.02
owner/contractors 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 residence.
Effluent Transport Piping
• The effluent transport piping should be 1.5-inch diameter Schedule 40 pipe sloped at a
2% minimum to drain to the STA manifold from the dose chamber.
• The effluent transport pipe should be bedded in compacted ¾ inch road base or native
soils provided that the native soils contain no angular rocks or rocks larger than 2½
inches in diameter to help prevent settlement of the pipe. Sags could cause standing
effluent to freeze and damage piping.
• A minimum 18 inches of cover soil should be provided over the effluent transport pipe.
Paved areas, patios or other areas without vegetative cover may be more susceptible to
frost. We recommend 48 inches of soil cover over the effluent pipe and insulation with at
least 2 inches of rigid foam insulation in these areas. If adequate cover soil is not
possible, we should re-evaluate soil cover prior to installation.
• The effluent pipe should be double encased with larger diameter Schedule 40 PVC pipe
underneath driveway surfaces and be provided with at least 48 inches of soil cover and
be insulated on top and sides with 2-inch-thick foam insulation board.
• All 90-degree bends should be installed using a 90 degree long-sweep or by using two
45-degree elbows.
Effluent Pumping System
• An Orenco PF3005, 115-volt, submersible effluent pump with a 1.25-inch diameter
discharge assembly, or equivalent, will be required for effluent pumping.
• The pump should be enclosed in an Orenco Biotube Pump Vault for effluent filtering and
to protect the pump from vibration.
• The maximum effluent transport distance from the pump discharge to the manifold is
estimated to be 60 feet.
• The elevation difference from pump discharge to the STA manifold is estimated to be 2
feet lower.
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Kumar & Associates, Inc. ® Project No. 19-7-198.02
• An equivalent pump must be capable of operating at 18.2 gallons per minute at 10.8 feet
of total dynamic head. A pump performance curve is provided as an attachment to this
report.
• The floats should be set to provide a dose volume of approximately 100 gallons. To
achieve the desired dose volume, the upper (“ON”) and lower (“OFF”) floats should be
set approximately 10 inches apart.
• The high-water alarm float should be placed approximately 3 inches above the pump
“ON” float in the dose chamber. The high-water alarm must be wired on a separate
electrical circuit from the pump.
• The flow differential between the first and last orifices is estimated to be 1.6%.
• A ⅛ inch diameter weep hole should be drilled in the effluent transport line prior to
exiting the dose chamber of the septic tank so the transport line can drain after each
pumping cycle.
OWTS OPERATION AND MAINTENANCE
The OWTS will require periodic inspection and maintenance to function properly. A properly
designed, installed and maintained system can greatly increase its lifespan. The level of
maintenance will vary depending on the complexity of the system and water use habits of the
residents. We recommend that an OWTS Operation and Maintenance (O&M) Manual be
developed. Depending on the complexity of the system a contract with an OWTS maintenance
provider may be prudent. Below are some basic recommendations for the OWTS O&M.
OWTS HOUSEHOLD OPERATION
The OWTS will require periodic inspection and maintenance to function properly. A properl y
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 O&M.
• Use of high efficiency water fixtures is recommended to decrease the hydraulic load on
the OWTS system.
• Fix plumbing leaks immediately as this may cause a hydraulic overload of the STA.
- 9 -
Kumar & Associates, Inc. ® Project No. 19-7-198.02
• Do not irrigate the area on top of or directly upgradient of the STA as this may cause a
hydraulic overload.
• Do not dispose of household waste down household drains as this may clog or damage
OWTS components. Examples of household waste includes: dental floss, cotton swabs,
coffee grounds, paper towels, feminine products and many other kitchen and bath items.
• Use of kitchen garbage disposals is not recommended. If a garbage disposal is utilized,
kitchen wastewater should be screened thoroughly. Many kitchen solids are not
decomposed in the septic tank and may cause increased tank pumping frequency.
• Do not dispose of household chemicals, greases, oils, paints, hot tub water or water
softener backwash in household drains. A separate drywell, if feasible, may be necessary
for hot tub water or water softener backwash disposal.
• Limit the use of bleach as this may harm useful bacteria in the septic tank and STA.
• Liquid dishwasher and clothes washer detergent is recommended for households served
by an OWTS. Clay substances used as fillers in powder detergents may result in
clogging of the STA.
• The effluent in septic tanks can freeze during extended periods of non-use in cold
weather. We recommend that a tank heater be installed in this system to help prevent
freezing.
OWTS MAINTENANCE
• Inspect the septic tank, effluent pump, effluent pump vault filter and soil treatment area at
least annually for problems or signs of failure.
• The pump vault filter should be cleaned annually by spray washing solids into the first
chamber of the septic tank.
• 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 absorption area,
which may shorten its life span.
• Pumping of the septic tank should take place when the level of the sludge and scum
layers combined take up 25 to 33% of the capacity of the first chamber of the tank.
- 10 -
Kumar & Associates, Inc. ® Project No. 19-7-198.02
OWTS CONSTRUCTION OBSERVATION
The Eagle County Environmental Health Department requires that the designer of the system
provide a record drawing and certification of the OWTS construction (As-Built). We should be
provided with at least 48-hour notice prior to the installer needing the inspections. Prior to
issuance of our certification letter, we require observation of all system components prior to
backfill. The number of site visits required for the inspection will depend on the installer’s
construction schedule.
LIMITATIONS
We have conducted this design in accordance with generally accepted engineering principles and
practices in this area at this time. We make no warranty either expressed or implied. The
recommendations provided in this report are based on the site conditions, profile pit evaluations,
soil texture analysis, the proposed construction and our experience in the area. Variations in the
subsurface conditions may not become evident until excavation is performed. If conditions
encountered during construction appear different from those described in this report, we should
be notified so that re-evaluation of the recommendations may be made.
This report has been prepared for the exclusive use by our client for design purposes. We are not
responsible for technical interpretations by others of our information. As the project evolves, we
should provide continued consultation and field services during construction to review and
monitor the implementation of our recommendations, and to verify that the recommendations
have been appropriately interpreted. Significant design changes may require additional analysis
or modifications to our design.
It is our opinion, that the designed location of the OWTS components does not violate any
setback requirements of the current Eagle County Regulations. Below is a table of common
minimum horizontal setbacks to OWTS components. Refer to the Eagle County Regulations for
a complete list of required setbacks. We recommend the OWTS components be surveyed by a
Professional Colorado Land Surveyor.
Kumar & Associates
Kumar & Associates
Kumar & Associates
NATIVE SOILSREMOVE VEGETATION AND SCARIFYUPPER 3" OF GROUND SURFACEPRIOR TO SAND PLACEMENTINFILTRATOR QUICK 4 PLUSSTANDARD LOW PROFILECHAMBERSEXISTING GROUND SURFACESAND FILTER PLACED ONEXISTING GROUND SURFACE16' MIN.BASAL WIDTH4" DIAMETEROBSERVATION PORT6.0'8.0'10" COVER SOIL.3:1 MAX. SLOPE.18" MIN. SAND FILTERBELOW CHAMBERS64' ESTIMATEDBASAL WIDTHDUE TO SLOPEKumar & AssociatesNOTE: SAND FILTER A MINIMUM 18" THICK BELOW EFFLUENTDISTRIBUTION CELL WITH SAND SURFACE SLOPE AT 3HORIZONTAL TO 1 VERTICAL..
Ground Surface
Insulate lid with 2" blue
board
Backfill valve box to bottom of
cap with onsite soil
1.5" Sch. 40, 90° long-sweep or two 45°
elbows
1.5" Sch. 40,
threaded cap
Install 6" valve box at ground
surface
Kumar & Associates
NOT TO SCALE
Notes
1.All piping, fittings and valves should be Sch. 40 39C.
2.Install distribution line cleanouts at the end of each distribution line.
Pump Selection for a Pressurized System - Single Family Residence Project
19-7-198.02 / 1360 CORDILLERA WAY
Parameters
Discharge Assembly Size
Transport Length
Transport Pipe Class
Transport Line Size
Distributing Valve Model
Max Elevation Lift
Manifold Length
Manifold Pipe Class
Manifold Pipe Size
Number of Laterals per Cell
Lateral Length
Lateral Pipe Class
Lateral Pipe Size
Orifice Size
Orifice Spacing
Residual Head
Flow Meter
'Add-on' Friction Losses
1.25
60
40
1.50
None
2
3
40
1.50
2
80
40
1.50
1/8
4
5
None
0
inches
feet
inches
feet
feet
inches
feet
inches
inches
feet
feet
inches
feet
Calculations
Minimum Flow Rate per Orifice
Number of Orifices per Zone
Total Flow Rate per Zone
Number of Laterals per Zone
% Flow Differential 1st/Last Orifice
Transport Velocity
0.43
42
18.2
2
1.6
2.9
gpm
gpm
%
fps
Frictional Head Losses
Loss through Discharge
Loss in Transport
Loss through Valve
Loss in Manifold
Loss in Laterals
Loss through Flowmeter
'Add-on' Friction Losses
2.3
1.3
0.0
0.0
0.2
0.0
0.0
feet
feet
feet
feet
feet
feet
feet
Pipe Volumes
Vol of Transport Line
Vol of Manifold
Vol of Laterals per Zone
Total Volume
6.3
0.3
16.9
23.6
gals
gals
gals
gals
Minimum Pump Requirements
Design Flow Rate
Total Dynamic Head
18.2
10.8
gpm
feet
0 5 10 15 20 25 30 35 40
0
50
100
150
200
250
300
Net Discharge (gpm)
Legend
System Curve:
Pump Curve:
Pump Optimal Range:
Operating Point:
Design Point:
PumpData
PF3005 High Head Effluent Pump
30 GPM, 1/2HP
115/230V 1Ø 60Hz, 200V 3Ø 60Hz
PF3007 High Head Effluent Pump
30 GPM, 3/4HP
230V 1Ø 60Hz, 200/460V 3Ø 60Hz
PF3010 High Head Effluent Pump
30 GPM, 1HP
230V 1Ø 60Hz, 200/460V 3Ø 60Hz
PF3015 High Head Effluent Pump
30 GPM, 1-1/2HP
230V 1Ø 60Hz, 200/230/460V 3Ø 60Hz
6/10/2021 Eagle County Government Mail - Kenyon Carpenter OWTS Swale
https://mail.google.com/mail/u/0?ik=da50768ddd&view=pt&search=all&permmsgid=msg-f%3A1701926346709695272&simpl=msg-f%3A17019263467…1/2
Claire Lewandowski <claire.lewandowski@eaglecounty.us>
Kenyon Carpenter OWTS Swale
David Young <dyoung@kumarusa.com>Mon, Jun 7, 2021 at 10:30 AM
To: Claire Lewandowski <claire.lewandowski@eaglecounty.us>
Cc: Shane Mello <smello@kumarusa.com>, Tyler Aldrich <tyler@treelinecohomes.com>
Claire, we are needing to put in a swale further up the slope from the STA at Kenyon/Carpenter residence. See
attached. The picture is current and the detail is our plan, no groundwater type intercept drain, but along with the swale
we thought we would include a pipe and some gravel. Drain/swale will be 10’ from the STA.
Judd Shoup is installer and Tyler is the new GC. Permit attached.
We are at the As-built phase, following up from last year and but wanted to keep you in the loop. Let us know if you are
ok with this approach.
Thanks
David A. Young, P.E.
Associate Principal | Project Manager
5020 County Road 154
Glenwood Springs, Colorado 81601
P: (970) 945-7988
M: (970) 618-4846
D: (970) 384-4837
E: dyoung@kumarusa.com
www.kumarusa.com
Denver (HQ) | Parker | Colorado Springs | Fort Collins | Glenwood Springs | Summit County
Geotechnical Engineering | Engineering Geology | Construction Materials Testing | Environmental Services
6/10/2021 Eagle County Government Mail - Kenyon Carpenter OWTS Swale
https://mail.google.com/mail/u/0?ik=da50768ddd&view=pt&search=all&permmsgid=msg-f%3A1701926346709695272&simpl=msg-f%3A17019263467…2/2
Confidentiality Notice: The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential
and/or privileged material. Any review, copying, transmission, disclosure, distribution, dissemination or other use of, or taking of any action in
reliance upon this information by person or entities other than the intended recipient is prohibited. If you received this in error, please contact
the sender and delete the material from any computer.
3 attachments
Carpenter.png
1873K
KenyonCarpenterSwale.pdf
288K
OWTS_Permit-9-25-2019.pdf
73K
8/1/2022
To Whom It May Concern:
We have been to the following site(s):
1360 Cordillera Way, Edwards
We have verified that the system was started properly. The System went through several
cycles with no issues.
Sincerely,
Scott McIntosh
Service Manager