HomeMy WebLinkAbout620 Jouflas Ranch Rd - 194126401003Environmental Health
Department
P.O. Box 179
500 Broadway
Eagle, CO 81631-0179
Phone: (970) 328-8730
Fax: (970) 328-7185
Permit
Permit No. OWTS-019401-2020
Permit Type: OWTS Permit
Work Classification: New
Permit Status: Active
Issue Date: 8/24/2020 Expires: 12/22/2020
On-Site Wastewater
Treatement System
Project Address Parcel Number
620 JOUFLAS RANCH RD, WOLCOTT AREA,194126401003
Owner Information Address
Brian Nestor 000620 JOUFLAS RANCH RD, Lot 3 Phone: (719) 740-0733
Cell:
Email:
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
Permitted Construction / Details:
A licensed installer has not been identified. No person shall install, renovate, or repair an OWTS in Eagle County
(EC) without a valid EC Systems Contractor License. Any person that conducts a business as a systems contractor
without having obtained a valid license section commits a Class 1 petty offense as defined in section 18-1.3-503,
C.R.S. Please notify the department when an installer is identified, prior to installation of the OWTS.
Install the OWTS exactly as depicted in the Kumar & Associates, Inc design dated July 30, 2020, stamped, signed,
and dated, August 3, 2020 by David A. Young, PE. The OWTS is designed to serve a total of four bedrooms, one
more than the proposed three bedrooms single-family residence.
The OWTS consists of a Valley Precast 1,500 gallon three-compartment septic tank (2,000 gallon total volume) with
an Orenco PF3005 effluent pump enclosed in an Orenco Biotube Pump Vault, with floats set to pressure dose
approximately 80 gallons a maximum of 22 feet to the soil treatment area (STA). The STA is arranged with two rows
of 20 Infiltrator Quick4 Standard Low Profile chambers in a bed configuration set atop a mound consisting 6 ft wide
by 80 ft long secondary sand media distribution cell over a 24 ft wide and 80 ft long basal area, exactly as shown in
the design.
NOTE: Prior to installation the proposed water line must be located and all setbacks maintained. If any water line
setback is encroached, the design engineer and Eagle County must be notified for proposed changes.
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
used 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 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 or occupancy of the dwelling.
Monday, August 24, 2020 1
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
August 24, 2020
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
Monday, August 24, 2020 2
INSPECTION WORKSHEET (WOLCOTT AREA - 620 JOUFLAS RANCH - 510823)
FOR EAGLE COUNTY GOVERNMENT
OWTS-019401-2020Case Number:Case Module:Permit Management
12/06/2021 ApprovedInspection Status:Inspection Date:
OWTS Final InspectionInspection Type:Inspector:Claire Lewandowski
Job Address:Parcel Number:620 Jouflas Ranch Rd
Wolcott Area, CO
194126401003
Company Name NameContact Type
Applicant DW Dantas Construction Llc David Dantas
Contractor WY construction Kenny Martin
Engineer KUMAR & ASSOCIATES Dave Young
Owner Brian Nestor
CommentsPassedChecklist Item
TrueSeptic Tank - Septic Tank
TrueRecord Drawing - Record Drawing
TrueRecord Photos - Record Photos
TrueSite and Soil - Site & Soil
True Received. Prepared and Submitted by Design Engineer, Kumar
and Associates, Inc. Dated October 29. 2021
Final Certification Letter - Final Certification Letter
TrueGeneral Plan - General Plan
True Sand gradation received and conforms to required secondary
sand.
Soil Treatment Area (STA) - Soil Treatment Area (STA)
True Eagle County licensed OWTS contractor WY Construction
completed the installation.
Identification of Systems Contractor - Identification of
Systems Contractor
December 06, 2021 Page 1 of 1P.O. Box 179, 500 Broadway, Eagle, CO 81631-0179
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
October 29, 2021
Brian Nestor
P. O. Box 4089
Avon, Colorado 81620
(briannestor@alpinebank.com)
Project No. 20-7-219.02
Permit No. OWTS-019401-2020
Subject: Certification of Onsite Wastewater Treatment System, Proposed Residence, Lot 3,
Filing 2, Bear Gulch, 620 Jouflas Ranch Road, Eagle County, Colorado
Dear Brian:
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 Brian Nestor dated March 31, 2020.
We previously designed the OWTS for the residence as submitted in our report dated July 30,
2020, Project No. 20-7-219.02. The system was designed for four bedrooms. The OWTS was
installed by WY Construction under Permit No. OWTS-019401-2020.
We performed our as-built evaluations on July 1, September 15 and October 28, 2021. The
OWTS components observed included: sewer line, cleanout, septic tank, effluent line, 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. The distance locations to
the septic tank shown on Figure 1 were made by taping.
On September 15, 2021, a sample of the secondary sand media was obtained and the results of
gradation analysis test are attached. On October 28, 2021, after power had been supplied to the
pump, a pump performance test was performed with adequate pump pressure observed.
The Infiltrator Quick4 Plus Standard Low Profile chambers were changed to Quick4 Plus
Standard chambers and the change is acceptable to us.
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:
Sample:
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 84.0
No. 16 1.18 67.0
No. 30 0.6 47.0
No. 50 0.3 22.0
No. 100 0.15 7.0
No. 200 0.075 2.6
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
0.98 millimeters
0.180 millimeters 0.25 to 0.60 FAIL 0.15 to 0.60 PASS
5.43 unitless ratio < or = 4.0 FAIL < or = 7.0 PASS
2.6 millimeters < or = 3 PASS < or = 3 PASS
Uniformity Coefficient (D60 / D10)
Percent passing thru #200 Sieve
11/02/2021
20-7-219.02
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 and Associates
Brian Nestor
620 Jouflas Ranch Road
Sand Filter
09/15/2021
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:\2020 Jobs\20-7-219.02\Asbuilt\20-7-219.02 Sand Gradation Analysis Spreadsheet
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 3, FILING 2, BEAR GULCH
620 JOUFLAS RANCH ROAD
EAGLE COUNTY, COLORADO
Project No. 20-7-219.02
Photograph 1: Sewer line
entering septic tank and
cleanout.
Photograph 2: Valley Precast
1,500 gallon, three-chamber
septic tank.
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 3, FILING 2, BEAR GULCH
620 JOUFLAS RANCH ROAD
EAGLE COUNTY, COLORADO
Project No. 20-7-219.02
Photograph 3: Orenco PF3005
pump in Biotube pump vault in
third chamber of septic tank.
Photograph 4: 1.5” Schedule 40
effluent transport line exiting
septic tank.
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 3, FILING 2, BEAR GULCH
620 JOUFLAS RANCH ROAD
EAGLE COUNTY, COLORADO
Project No. 20-7-219.02
Photograph 5: Soil treatment
area (STA) with observation
ports on sides and corners.
Photograph 6: STA basal area.
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 3, FILING 2, BEAR GULCH
620 JOUFLAS RANCH ROAD
EAGLE COUNTY, COLORADO
Project No. 20-7-219.02
Photograph 7: 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 RESIDENCE
LOT 3, FILING 2, BEAR GULCH
620 JOUFLAS RANCH ROAD
EAGLE COUNTY, COLORADO
PROJECT NO. 20-7-219.02
JULY 30, 2020
PREPARED FOR:
BRIAN NESTOR
P. O. BOX 4089
AVON, COLORADO 81620
(briannestor@alpinebank.com)
Kumar & Associates, Inc. Project No. 20-7-219.02
TABLE OF CONTENTS
INTRODUCTION ...................................................................................................................... - 1 -
PROPOSED CONSTRUCTION ................................................................................................ - 1 -
SITE CONDITIONS ................................................................................................................... - 1 -
SUBSURFACE CONDITIONS ................................................................................................. - 1 -
OWTS ANALYSIS .................................................................................................................... - 2 -
DESIGN RECOMMENDATIONS ............................................................................................ - 3 -
SOIL TREATMENT AREA................................................................................................... - 3 -
OWTS COMPONENTS ......................................................................................................... - 4 -
OWTS OPERATION AND MAINTENANCE.......................................................................... - 7 -
OWTS HOUSEHOLD OPERATION .................................................................................... - 7 -
OWTS MAINTENANCE ....................................................................................................... - 8 -
OWTS CONSTRUCTION OBSERVATION ............................................................................ - 8 -
LIMITATIONS ........................................................................................................................... - 8 -
FIGURES
FIGURE 1 – OWTS SITE PLAN
FIGURE 2 – USDA GRADATION TEST RESULTS
FIGURE 3 – SOIL TREATMENT AREA CALCULATIONS
FIGURE 4 – SOIL TREATMENT AREA PLAN VIEW
FIGURE 5 – SOIL TREATMENT ARE CROSS SECTION
FIGURE 6 – DISTRIBUTION LINE CLEANOUT DETAIL
ATTACHMENTS
VALLEY PRECAST 1,500 GALLON, THREE-CHAMBER SEPTIC TANK DETAIL
ORENCO PF3005 PUMP PERFORMANCE CURVE
Kumar & Associates, Inc. Project No. 20-7-219.02
INTRODUCTION
This report provides the results of an onsite wastewater treatment system (OWTS) design for the
proposed residence to be located on Lot 3, Filing 2, Bear Gulch, 620 Jouflas Ranch Road, 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 design was
performed in general accordance with our agreement to Brian Nestor dated March 31, 2020.
PROPOSED CONSTRUCTION
The residence will be a three-bedroom single-family structure with an attached garage located on
the lot as shown on Figure 1. The proposed OWTS soil treatment area (STA) will be located to
the north of the residence. The OWTS will be designed for an additional bedroom for a total of 4
bedrooms. Water service will be provided to the residence by an onsite well located to the east
of the proposed residence. The location of the water service line is not currently designed;
however, we should be notified its route encroaches on the required 25 feet minimum setback
from the STA.
If proposed construction is different than that described, we should be contacted to re-evaluate
our design recommendations.
SITE CONDITIONS
The lot was vacant and covered with about 1 to 3 feet of snow at the time of field exploration in
April 2020. The ground surface in the proposed building area and STA appeared mostly natural
and is moderately steeply sloping down to the north at grades of from about 20% to 30%.
Elevation difference across the proposed building foot-print is about is about 10 feet. Vegetation
consists of dense oak brush with scattered aspens and conifers, and some grass and weeds. No
surface water features were observed in the near vicinity of the lot. The onsite well is
approximately 270 feet east of the proposed STA.
SUBSURFACE CONDITIONS
The field exploration for the OWTS was conducted on April 15, 2020. Two profile pits (Profile
Pits 1 and 2) were excavated with a trackhoe at the approximate locations shown on Figure 1 to
evaluate the subsurface conditions at the planned soil treatment area (STA) for the OWTS. The
pits were logged by a representative of Kumar & Associates. Logs of the profile pits are
provided below.
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Kumar & Associates, Inc. Project No. 20-7-219.02
Log of Profile Pit 1
Depth USDA Classification
0-1½’ TOPSOIL; organic loam, firm, moist, dark brown.
1½’-6½’ CLAY; cobbly to very cobbly, strong blocky structure, very stiff, moist to slightly
moist, brown.
• Bottom of pit @ 6½ feet where digging refusal in dense cobbles occurred.
• No free water or redoximorphic features observed at time of pit excavation.
Log of Profile Pit 2
Depth USDA Classification
0-2’ TOPSOIL; organic loam, firm, moist to slightly moist, dark brown.
2’-5½’ CLAY; cobbly to very cobbly, strong blocky structure, very stiff, slightly moist,
brown.
• Disturbed bulk sample taken from 3½ to 4½ feet
• Bottom of pit @ 5½ feet where digging refusal on a boulder occurred.
• No free water or redoximorphic features observed at time of pit excavation.
The soils encountered in the profile pits, below about 1½ to 2 feet of organic topsoil, consisted of
cobbly to very cobbly Clay that extended down to the depths explored of 5½ and 6½ feet.
Hydrometer and gradation analyses were performed on a disturbed bulk sample of the soils from
Profile Pit 2 from 3½ to 4½ feet depth with the results provided on Figure 2. The tested sample
(minus No. 10 size sieve fraction) classified as Clay per the USDA system. No free water was
encountered in the pits nor indications of seasonal high groundwater were observed at the time of
the pit excavations.
Based on the subsurface conditions and laboratory testing, the soils at the STA have been
classified as Type 4 per State regulations, which equates to a long-term acceptance rate (LTAR)
of 0.20 gallons per square foot per day for the Clay soils.
OWTS ANALYSIS
Based on the site conditions, the profile pit evaluations and our experience in the area, the clay
soils are expansive and tend to swell when wetted. Based on these considerations, we
recommend a sand filter wastewater treatment system for proper treatment of the effluent. The
system will consist of chambers in a bed configuration overlying a sand filter media placed on
the native ground surface. The STA will be sized four bedrooms (seven persons) using an LTAR
of 0.8 gallons per square foot per day for imported “secondary sand media”. The STA basal area
of the sand will be sized for Soil Type 4 with an LTAR of 0.20 gallons per square foot per day.
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Kumar & Associates, Inc. Project No. 20-7-219.02
The sewage will gravity flow from the residence to the septic tank for primary treatment and then
be pressured-dosed on a regular basis to the STA for dispersal and final treatment. Pressure
dosing is necessary for the sand filter treatment system.
The design location of the water service line to the residence should take into consideration for
the required setbacks.
DESIGN RECOMMENDATIONS
The design recommendations presented below are based on the proposed construction, the site
and subsurface conditions encountered and our experience in the area. A layout of the proposed
OWTS components is provided on Figure 1. If conditions encountered during construction are
different than those that are described in this report, please contact us to re-evaluate our design
recommendations.
SOIL TREATMENT AREA
• The STA will consist of 2 rows of 20 Infiltrator Quick 4 Plus Standard Low Profile
chambers in a bed configuration placed on imported secondary sand media. The sand
media will be placed on the natural ground surface after vegetation is removed. A
pressure distribution system will be used to disperse the effluent to the chambers on a
regular basis.
• 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 linear foot.
The basal area was sized based on an LTAR of 0.20 gallons per square foot per day for
Soil Type 4 for the natural clay soils.
• A 30% reduction of the STA size was applied for use of Infiltrator chambers. The
minimum distribution cell dimensions are 6 feet wide by 77 feet long. The proposed
distribution cell will be 6 feet wide by 80 feet long (480 square feet).
• The minimum basal area of the mound is 80 feet long by 24 feet wide (1920 square feet).
• Soil treatment area calculations are shown on Figure 3.
• Vegetation should be removed and the ground surface scarified to at least 3” deep prior to
the sand placement.
• Distribution lines, consisting of 1.5-inch diameter, Schedule 40 piping, with ⅛-inch
diameter orifice holes drilled at 4-foot centers near the center of the Infiltrator 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
infiltrators by pipe ties. The orifice holes should face up toward the infiltrator surface
above.
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Kumar & Associates, Inc. Project No. 20-7-219.02
• 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 the pressure dosing. Install
splash plates below drain holes.
• The sand bed should be oriented along ground contours to minimize soil cover.
• Sand filter material should extend one foot horizontally from the perimeter of the
chamber bed and then be sloped at 3 horizontal to 1 vertical 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 for the
filter media. A sample of the sand filter media should be obtained within one month prior
to installation of the system for gradation analyses testing by us or the gradation test
results of the sand provided to us for approval.
• The sand filter material shall be placed in lifts not exceeding 10 inches thick. Each lift
shall be bucket compacted until settlement ceases.
• A minimum of 12 inches and a maximum of 24 inches of cover soil should be placed
over the chambers.
• Backfill should be graded to deflect surface water away from the STA and should be
sloped at 3 horizontal to 1 vertical or flatter. This will likely require a swale along the
up-slope side of the STA.
• Disturbed soil should be re-vegetated as soon as possible with a native grass mix. No
trees, shrubs or other plants with deep roots should be planted on or near the STA as this
may damage the system piping.
• Four-inch diameter inspection ports should be installed vertically into the knockouts
provided in the Infiltrator end caps. Install ports at each 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 4 and a cross section of the STA is
presented on Figure 5.
• Cleanouts are required at the end of the distribution line. See Figure 6 for the cleanout
detail.
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.
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Kumar & Associates, Inc. Project No. 20-7-219.02
Septic Tank
• A 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.
• 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.
• The tank must be set level. The excavation bottom must be free of large rocks or other
objects that could damage the tank during placement. A road base or gravel bedding
material may be needed to prevent tank damage during placement and act as a leveling
course.
• The tank lids must extend to final surface grade and made to be easily located.
• Install the tank with 2 feet minimum cover soil for frost protection. Maximum tank soil
cover is 4 feet.
Sewer Pipe
• The sewer line to the septic tank should not be less than the diameter of the building
drains and not less than 4 inches in diameter.
• The sewer pipe should have a rating of SDR35 or stronger.
• The sewer pipe should be sloped between 2% to 4% to help limit disturbance of solids in
the tank and the potential for sewage bypass of the first chamber of the tank. If a steeper
slope is needed, this can be accomplished with vertical step-downs in the sewer line.
• A minimum 36 inches of cover soil should be provided over the sewer pipe. Paved areas,
patios or other areas without vegetative cover may be more susceptible to frost and we
recommend 48 inches of soil cover over the sewer pipe in these areas, and the pipe be
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 double encased with larger diameter Schedule 40 PVC pipe the
entire length of the sewer line if there is encroachment on the 50 feet setback to the well.
The encasing pipe should be sealed at both ends.
• The sewer pipe should be bedded in compacted ¾ inch road base or native soils provided
that the native soils contain no angular rocks or rocks larger than 2½ inches in diameter
to help prevent settlement of the pipe. Sags in the pipe could cause standing effluent to
freeze and damage the piping.
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Kumar & Associates, Inc. Project No. 20-7-219.02
• Install cleanout pipes within 5 feet of the building foundation, where the sewer pipes
bend 90 degrees or more and at every 100 feet of sewer pipe.
• All 90-degree bends should be installed using a 90-degree long-sweep or by using two
45-degree elbows.
• The sewer line location shown on Figure 1 is considered conceptual. We assume that
there will be only one sewer line exiting the residence. It is the responsibility of the
owner/contractors to locate all sewer line exit locations and connections to the septic
tank. We should be notified if there is more than one sewer line exiting the building.
Effluent Transport Piping
• The effluent transport pipe should be 1.5-inch diameter Schedule 40 piping 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 to the piping.
• A minimum 18 inches of cover soil should be provided over the effluent transport pipe.
Paved areas, patios or other areas without vegetative cover may be more susceptible to
frost. We recommend 48 inches of soil cover over the effluent pipe and insulation with at
least 2 inches of rigid foam insulation in these areas. If adequate cover soil is not
possible, we should re-evaluate the condition prior to installation.
• 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 the effluent pumping.
• The maximum effluent transport distance from the pump discharge to the STA estimated
to be 22 feet.
• The elevation difference from pump discharge to the STA is estimated to be about 1 feet.
• The pump should be enclosed in an Orenco Biotube Pump Vault for effluent filtering and
protection of the pump from vibration.
• An equivalent pump must be capable of operating at 18.2 gallons per minute at 8.9 feet of
total dynamic head. A pump performance curve is provided as an attachment to this
report.
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Kumar & Associates, Inc. Project No. 20-7-219.02
• The floats should be set to provide a dose volume of approximately 80 gallons. To
achieve the desired dose volume, the upper (“ON”) and lower (“OFF”) floats should be
set approximately 8 inches apart.
• The flow differential between the first and last orifices is estimated to be 1.6%.
• The high-water alarm float should be placed approximately 3 inches above the “ON”
float in the dose tank. The high-water alarm must be wired on a separate electrical circuit
from the pump.
• A ⅛ inch diameter weep hole should be drilled in the effluent transport line prior to
exiting the dose 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
• Use of high efficiency water fixtures is recommended to decrease the hydraulic load on
the OWTS system.
• Fix plumbing leaks immediately as this may cause a hydraulic overload of the soil
absorption system.
• Do not irrigate the area on top of or directly upgradient of the soil absorption field as this
may cause a hydraulic overload.
• Do not dispose of household waste down drains as this may clog or damage OWTS
components. Examples of household waste includes: dental floss, cotton swabs, coffee
grounds, paper towels, feminine products and many other kitchen and bath items.
• Use of kitchen garbage disposals is not recommended. If a garbage disposal is utilized,
kitchen wastewater should be screened thoroughly. Many kitchen solids are not
decomposed in the septic tank and may cause increased tank pumping frequency.
• Do not dispose of household chemicals, greases, oils, paints, hot tub water or water
softener backwash in household drains. A separate drywell, if feasible, may be necessary
for hot tub water or water softener backwash disposal.
• Limit the use of bleach as this may harm useful bacteria in the septic tank and soil
absorption system.
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Kumar & Associates, Inc. Project No. 20-7-219.02
• 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 soil absorption system.
• The effluent in septic tanks can freeze during extended periods of non-use in cold
weather. We recommend that a tank heater be installed in this system to help prevent
freezing.
OWTS MAINTENANCE
• Inspect the septic tank, pump, pump vault filter and STA at least annually for problems or
signs of failure.
• The filter should be cleaned annually by spray washing solids into the first chamber of
the septic tank.
• The septic tank should be pumped and cleaned about every 3 to 5 years depending on
use. Longer pumping intervals may increase the amount of solids that reach the STA,
which may shorten its life span.
• Pumping of the septic tank should take place when the level of the sludge and scum
layers combined take up 25 to 33% of the capacity of the first chamber of the tank.
OWTS CONSTRUCTION OBSERVATION
The Eagle County Environmental Health Department requires that the designer of the system
provide a record drawing and certification of the OWTS construction (As-Built inspection). We
should be provided with at least 48-hour notice prior to the installer needing the inspections.
Prior to issuance of our certification letter, we require observation of all system components
prior to backfill. The As-Built inspection will include a pump test for the system. The number
of site visits required for the inspection will depend on the installer’s construction schedule.
LIMITATIONS
We have conducted this design in accordance with generally accepted engineering principles and
practices in this area at this time. We make no warranty either expressed or implied. The
recommendations provided in this report are based on the site conditions, profile pit evaluations
and soil texture analysis, the proposed construction and our experience in the area. Variations in
the subsurface conditions may not become evident until excavation is performed. If conditions
encountered during construction appear different from those described in this report, we should
be notified so that re-evaluation of the recommendations may be made.
Kumar & Associates
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NATIVE SOILSREMOVE VEGETATION AND SCARIFYUPPER 3" OF GROUND SURFACEPRIOR TO SAND PLACEMENTINFILTRATOR QUICK 4 PLUSSTANDARD LOW PROFILECHAMBERSEXISTING GROUND SURFACESAND FILTER PLACED ONNATURAL GROUND SURFACE4" DIAMETEROBSERVATION PORT6.0'8.0'MINIMUM 12" COVER SOIL.3:1 MAX. SLOPE.24' MINIMUMBASAL WIDTHKumar & Associates
Kumar & Associates
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Pump Selection for a Pressurized System - Single Family Residence Project
20-7-219.02 / Lot 3, Bear Gulch
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
22
40
1.50
None
1
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
0.5
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
2.3
0.3
16.9
19.6
gals
gals
gals
gals
Minimum Pump Requirements
Design Flow Rate
Total Dynamic Head
18.2
8.9
gpm
feet
0 5 10 15 20 25 30 35 40
0
50
100
150
200
250
300
Net Discharge (gpm)
PumpData
PF3005 High Head Effluent Pump
30 GPM, 1/2HP
115/230V 1Ø 60Hz, 200V 3Ø 60Hz
Legend
System Curve:
Pump Curve:
Pump Optimal Range:
Operating Point:
Design Point: