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HomeMy WebLinkAbout136 Sage Grouse - 210716406001Environmental Health
Department
P.O. Box 179
500 Broadway
Eagle, CO 81631-0179
Phone: (970) 328-8730
Fax: (970) 328-7185
Permit
Permit No. OWTS-023679-2022
Permit Type: OWTS Permit
Work Classification: New
Permit Status: Active
Issue Date: 3/24/2022 Expires: 1/23/2023
On-Site Wastewater
Treatement System
Project Address Parcel Number
136 SAGE GROUSE TRL, EDWARDS AREA,210716406001
Owner Information Address
Jeffrey & Rebecca Christoff Phone: (513) 678-1856
Cell:
Email: jchristoff@deloitte.com
Inspections:
For Inspections Call: (970)
328-8755
Engineer Phone Email
KUMAR & ASSOCIATES, Dave Young (970) 945-7988 dyoung@kumarusa.com
Contractor License Number Phone Email
Permitted Construction / Details:
Install the new system exactly as depicted in the Kumar and Associates design dated July 9th, 2021, stamped and
signed on July 12th, 2021 by David A Young, PE. The new system will be sized to accommodate the maximum daily
flows for a 5 bedroom residence.
This OWTS consists of one sewer line from the residence. A Valley Precast 1,500 gallon, three-compartment septic
tank with a total volume of 2,000 gallons will be used with an Orenco PF3005 submersible effluent pump, or
equivalent, enclosed in an Orenco Biotube Pump Vault in the third compartment. The pump floats will be set to
pump 100 gallons per dose.
The soil treatment area is a 2 foot mounded sand filter. The mound consists of a one foot thick gravel bed with a
distribution area of 62.5 feet long by 12 feet wide. The sand filter should be sloped at 3 horizontal to 1 vertical or
flatter. The basal area should be 62.5 feet long by 27.5 feet wide. Gradation analysis must confirm that sand is
secondary sand media. Do not install in wet or frozen ground.
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.
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.
Wednesday, August 10, 2022 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
Danielle Salinsky
Date
March 24, 2022
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 PERMIT4.1.6(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
Wednesday, August 10, 2022 2
***************************************************************************
APPLICATION FOR ON-SITE WASTEWATER TREATMENT SYSTEM (OWTS) PERMIT
INCOMPLETE APPLICATIONS MAY NOT BE ACCEPTED (SITE PLAN MUST BE INCLUDED)
FEE SCHEDULE
APPLICATION FEE FOR NEW OWTS OR MAJOR REPAIRS $800.00 MINOR REPAIR FEE $400.00
Fee includes the design review, permitting and maintenance of OWTS records
Make all checks payable to: Eagle County Treasurer
Property Owner: _______________________________________Phone: ________________________
Owner Mailing Address: ________________________________ email: _________________________
Professional Engineer: __________________________________ Phone: ________________________
Applicant / Contact Person: ______________________________Phone: ________________________
Licensed Systems Contractor Name / Company: ___________________________________________
Contractor Mailing Address: _________________________________ Contractor License #:_______
Contractor Phone Number: ________________________ email: ______________________________
OWTS Permit Application is for: ____ New Installation ____ Alteration ____ Repair
Tax Parcel Number: _________________________________ Lot Size: ________________________
Assessor’s Link: www.eaglecounty.us/patie/
Physical Address: _____________________________________________________________________
Legal Description: ____________________________________________________________________
Building Type: _____ Residential / Single Family
_____ Residential / Multi Family
_____ Commercial / Industrial
Number of Bedrooms: ______
Number of Bedrooms: ______
Type of Use: _______________
*As of 06/27/2014, all systems require design by a Registered Professional Engineer.
Type of Water Supply: ____ Private Well ____ Spring ____ Surface ____ Public
If Public, Name of Supplier: ____________________________________________________________
Applicant Signature: ______________________________________Date:_______________________
****************************************************************************
Office Use Only: OWTS PERMIT # __________________ BUILDING PERMIT # ____________________
Amount Paid: ___________ Receipt #: ___________ Check #: ___________ Date: ______________
DEPARTMENT OF
ENVIRONMENTAL HEALTH
(970) 328-8755
FAX: (970) 328-8788
TOLL FREE: 800-225-6136
www.eaglecounty.us
P.O. Box 179
500 Broadway
Eagle, CO 81631
environment@eaglecounty.us
Jeff Christoff 513-678-1856
1788 MACKENZIE TRCE
BATAVIA, OH 45103-8670 jchristoff@deloitte.com
David Young / Kumar & Assoc. 970-945-7988
Sean McGinley - MMH 970-471-8202
TBD
2107-164-06-001 3.205 acres
136 Sage Grouse Trail, Cordillera, CO 81632
CORDILLERA SUB FIL 36 Block: 2 Lot: 1
5
Eagle River Water & San District
03 / 14 / 2022
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-524897-2023 Permit Number: OWTS-023679-2022
Inspection Date: 08/25/2023
Inspector: Weems, Kirk
Permit Type: OWTS Permit
Inspection Type: OWTS Final Inspection
Work Classification: NewOwner:Jeffrey & Rebecca Christoff
Job Address:136 SAGE GROUSE TRL IVR Pin Number:195536
EDWARDS AREA, CO Project:<NONE>
Parcel Number:210716406001
Contractor:Phone: / Cell:
Inspection Status: Approved
Inspection Notes
Pre-Backfill performed on 08/25/23 - Need gradation analysis for mound sand.
Inspector Comments
Added Item: Septic Tank
Confirm 5'6" setback from building. A Valley Precast 1,500 gallon, three-compartment septic tank with
a total volume of 2,000 gallons was installed with an Orenco PF3005 submersible effluent pump
enclosed in an Orenco Biotube Pump Vault in the third compartment.
Added Item: Record Drawing
Received 9/22/2023 from K&A.
Added Item: Record Photos
Received 9/22/2023 from K&A.
Added Item: Site and Soil
Received 3/16/2022.
Added Item: Final Certification Letter
Received 9/22/2023 from K&A.
Added Item: General Plan
Received 3/16/2022. 8/25/23 - Pre-backfill inspection performed. All components installed according
to plan. Fabric on site for covering STA prior to backfill.
Added Item: Soil Treatment Area (STA)
8/25/23 - STA sand and gravel installed according to plan. Need Sand Gradation analysis. Brought
this up with GC while on site for inspection. 9/22/2023 Gradation analysis received. The soil treatment
area is a 2 foot mounded sand filter. The mound consists of a one foot thick gravel bed with a
distribution area of 62.5 feet long by 12 feet wide. The basal area is 62.5 feet long by 27.5 feet wide.
Monday, September 25, 2023
For more information visit: http://www.eaglecounty.us
Page 1 of 2
Added Item: Identification of Systems Contractor
8/25/23 - JV Excavating
Monday, September 25, 2023
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
September 20, 2023
Allen-Guerra Architecture
Attn: Suzanne Allen Sabo
P.O. Box 5540
Frisco, Colorado 80443
suzzanne@allen-guerra.com
Project No. 21-7-486
Permit No. OWTS-023679-2022
Subject: Certification of Onsite Wastewater Treatment System, Proposed Christoff
Residence, Lot 1, Block 2, Filing 36, Cordillera, 136 Sage Grouse Way, Eagle
County, Colorado
Dear Suzanne:
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 Allen-Guerra Architecture dated May 26, 2021.
We previously designed the OWTS for the residence as submitted in our report dated July 9,
2021, Project No. 21-7-486. The system was designed for five bedrooms. The OWTS was
installed by Meadow Mountain Homes under Permit No. OWTS-023679-2022.
We performed our as-built evaluations on August 11, 28 and 29, 2023. 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. The distance locations to the septic tank
shown on Figure 1 were made by taping.
On June 21, 2023, a sample of the secondary sand media was obtained and the results of
gradation analysis test are attached. On August 29, 2023, 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
system or improper backfill and site grading could affect the operation and effectiveness of the
OWTS.
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 81.0
No. 16 1.18 64.0
No. 30 0.6 45.0
No. 50 0.3 19.0
No. 100 0.15 6.0
No. 200 0.075 2.0
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
1.06 millimeters
0.196 millimeters 0.25 to 0.60 FAIL 0.15 to 0.60 PASS
5.39 unitless ratio < or = 4.0 FAIL < or = 7.0 PASS
2.0 millimeters < or = 3 PASS < or = 3 PASS
Uniformity Coefficient (D60 / D10)
Percent passing thru #200 Sieve
06/21/2023
21-7-486
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 Glenwood Springs
Allen-Guerra Architecture
Western Slope Materials - Silt
Secondary Sand
06/21/2023
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
OWTS PHOTOGRAPH LOG
CHRISTOFF RESIDENCE
LOT 1, BLOCK 2, FILING 36, CORDILLERA
136 SAGE GROUSE WAY
EAGLE COUNTY, COLORADO
Project No. 21-7-486
Photograph 1: Sewer line
exiting residence, cleanout, and
Valley Precast 1,500-gallon, 3
chamber septic tank.
Photograph 2: Sewer line
entering tank and inlet tee.
OWTS PHOTOGRAPH LOG
CHRISTOFF RESIDENCE
LOT 1, BLOCK 2, FILING 36, CORDILLERA
136 SAGE GROUSE WAY
EAGLE COUNTY, COLORADO
Project No. 21-7-486
Photograph 3: Pump installed
in the third chamber of the septic
tank.
Photograph 4: 1.5” Schedule 40
effluent transport line exiting
septic tank to soil treatment area
(STA).
OWTS PHOTOGRAPH LOG
CHRISTOFF RESIDENCE
LOT 1, BLOCK 2, FILING 36, CORDILLERA
136 SAGE GROUSE WAY
EAGLE COUNTY, COLORADO
Project No. 21-7-486
Photograph 5: Soil treatment
area (STA): aggregate bed
distribution cell over sand filter.
Photograph 6: 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 CHRISTOFF RESIDENCE
LOT 1, BLOCK 2, FILING 36, CORDILLERA
136 SAGE GROUSE WAY
EAGLE COUNTY, COLORADO
PROJECT NO. 21-7-486
JULY 9, 2021
PREPARED FOR:
ALLEN-GUERRA ARCHITECTURE
ATTN: SUZANNE ALLEN SABO
P. O. BOX 5540
FRISCO, COLORADO 80443
(suzzane@allen-guerra.com)
Kumar & Associates, Inc. Project No. 21-7-486
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 -
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 ORIFICE SHIELD TECHNICAL DATA SHEET
ORENCO PF3005 EFFLUENT PUMP CURVE
Kumar & Associates, Inc. Project No. 21-7-486
INTRODUCTION
This report provides the results of an onsite wastewater treatment system (OWTS) design for the
proposed Christoff residence to be located on Lot 1, Block 2, Filing 36, Cordillera, 136 Sage
Grouse 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 in accordance with our agreement for professional services to Allen-
Guerra Architecture dated May 26, 2021.
PROPOSED CONSTRUCTION
The proposed residence will be a five-bedroom structure with a walkout basement level and an
attached garage located on the lot as shown on Figure 1. The proposed OWTS soil treatment
area (STA) will be located to the west of the residence. Water service will be provided to the
residence by the public water supply from Sage Grouse Way to the northeast of the residence.
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 terrain at the proposed STA location slopes moderately steeply down to the west at
grades of about 15 to 20%. Vegetation consists of grass and sagebrush. Basalt flow outcrops are
visible on the lot. No surface water features were observed in the near vicinity of the lot. The
water service line supply to the residence will be from the end of Sage Grouse Way and located
well outside the required 25 feet minimum set-back from the OWTS. We are not aware of any
nearby water wells.
SUBSURFACE CONDITIONS
The field exploration for the OWTS was conducted on December 11, 2018. Three profile pits
(Profile Pits 1, 2 and 3) were excavated with a mini-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.
- 2 -
Kumar & Associates, Inc. Project No. 21-7-486
Log of Profile Pit 1
Depth USDA Classification
0-1’ TOPSOIL; gravelly organic Loam, loose, moist, dark brown.
1’-1½’ BASALT FLOW; hard, slightly moist, gray.
• Bottom of pit @ 1½ feet where digging refusal with the mini-excavator occurred.
• No free water or redoximorphic features observed at time of excavation.
Log of Profile Pit 2
Depth USDA Classification
0-½’ TOPSOIL; gravelly organic Loam, loose, moist, dark brown.
½’-1’ BASALT FLOW; hard, slightly moist, gray.
• Bottom of pit @ 1 foot where digging refusal with the mini-excavator occurred.
• No free water or redoximorphic features observed at time of excavation.
Log of Profile Pit 3
Depth USDA Classification
0-1’ TOPSOIL; gravelly organic Loam, loose, moist, dark brown.
1’-1½’ BASALT FLOW; hard, slightly moist, gray.
• Disturbed bulk sample taken from ½ to 1 foot.
• Bottom of pit @ 1½ foot where digging refusal with the mini-excavator occurred.
• 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 hard basalt
flow that extended down to the depths explored of 1 to 1½ feet. Practical digging refusal was
encountered with the mini-excavator in the basalt flow material due to its hardness. 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, the soils have been classified as Soil Type R-1; Option 1
and Soil Type 3 per State regulations, which equates to a long-term acceptance rate (LTAR) of
0.35 gallons per square foot per day. 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.
OWTS ANALYSIS
Based on the site conditions, profile pit evaluations and our experience in the area, an aggregate
bed overlying a minimum 2 feet thick mounded sand filter is needed to provide adequate
treatment of the effluent from the residence. The sand filter is needed due to the excessive rock
content of the subsoils. The STA aggregate bed will be sized for five bedrooms (eight persons)
using an LTAR of 0.8 gallons per square foot per day for the imported “secondary sand media”.
- 3 -
Kumar & Associates, Inc. Project No. 21-7-486
The STA basal area of the sand will be sized for Soil Type 3 with an LTAR of 0.35 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.
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 and we will re-evaluate our design recommendations.
SOIL TREATMENT AREA
• The STA will consist of a 1 foot thick aggregate (gravel) bed that is 62.5 feet long by
12 feet wide (750 square feet) constructed on a two feet thick mounded sand filter. The
aggregate area is sized based on an LTAR of 0.8 gallons per square foot per day for the
sand filter. A pressure distribution system will be used to dose the effluent to the STA at
regular intervals.
• The minimum basal area of the mounded sand filter is 62.5 feet long by 27.5 feet wide
(1,719 square feet). The mounded sand filter basal area is sized based on an LTAR of
0.35 gallons per square foot per day for Soil Type 3.
• The base of the aggregate bed must be above existing grade.
• Soil treatment area calculations are shown on Figure 2.
• The sand media will be placed on the scarified native ground surface.
• Vegetation should be removed and the surface scarified in the existing ground surface
that is to be under the STA.
• Sand filter material should extend one foot horizontally from the perimeter of the
aggregate bed and then be sloped at 3 Horizontal to 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 for the
filter media. A sample of the sand filter media 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.
- 4 -
Kumar & Associates, Inc. Project No. 21-7-486
• Distribution lines, consisting of 1.5-inch diameter, Schedule 40 piping, with ⅛-inch
diameter orifice holes drilled at 3-foot centers, should be installed in the aggregate bed,
see Figure 3. The orifice holes should face down.
• Orenco Orifice Shields, or equivalent, should be installed on the effluent distribution
piping within the aggregate bed at each orifice location to limit potential masking holes
by the gravel. A technical data sheet of the shields is provided as an attachment.
• A minimum of 12 inches and a maximum of 24 inches of cover soil should be placed
over the STA. Prior to placement of cover soil, a Hanes Geocomponents Pro Silver
2 ounce/square yard filter fabric, or equivalent, should be placed over the gravel. Mirafi
140N or 160N filter fabric is not suitable for this use.
• Backfill should be graded to deflect surface water away from the STA and should be
sloped at 3 Horizontal to 1 Vertical (3H:1V) maximum in all directions.
• 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 system piping.
• Four-inch diameter inspection ports should be installed vertically into each corner and in
the middle of the aggregate bed. 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 should be perforated.
• The STA must be a minimum of 20 feet from the residence.
• The STA must be a minimum of 25 feet from potable water supply line.
• The STA must be a minimum of 10 feet from any property line.
• 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 in each of the distribution lines in the STA. A typical
cleanout detail is provided as 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, or equivalent, is proposed for
primary treatment and dosing. A detail of the tank is provided as an attachment to the
report.
- 5 -
Kumar & Associates, Inc. Project No. 21-7-486
• 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 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.
• Schedule 40 PVC pipe is required underneath driveway surfaces and should be provided
with at least 48 inches of soil cover, and be insulated on top and sides with 2-inch thick
rigid foam insulation board.
• 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.
- 6 -
Kumar & Associates, Inc. Project No. 21-7-486
• 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 are other sewer lines exiting the residence.
Effluent Transport Piping
• 1.5 inch diameter Schedule 40 effluent transport piping should be sloped at 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 50 feet.
• The elevation difference from pump discharge to the STA manifold is estimated to be
4 feet.
• An equivalent pump must be capable of operating at 24.7 gallons per minute at 17.8 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.
- 7 -
Kumar & Associates, Inc. Project No. 21-7-486
• 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 0.9%.
• An 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 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 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.
• 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.
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Kumar & Associates, Inc. Project No. 21-7-486
• 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.
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
Kumar & Associates
Kumar & Associates
Kumar & Associates
1' THICK LAYER OF 1.5"SIZE AGGREGATE WITH8.5" BELOW PIPES AND2" ABOVE PIPES. AGGREGATE BEDMUST BE ABOVE EXISTING GRADE.HANES GEOCOMPONENTS PROSILVER FILTER FABRIC, OREQUIVALENT, OVER AGGREGATE BEDNATIVE SOILSREMOVE VEGETATION AND SCARIFYUPPER 6" OF GROUND SURFACEPRIOR TO SAND PLACEMENT SAND FILTER27.5' MINIMUMBASAL WIDTH1'12.0'4" DIAMETEROBSERVATION PORT10" MIN. COVER SOIL.3H:1V MAX. SLOPE.2.0' MIN. SANDFILTER UNDERAGGREGATE BEDUPHILL SWALE TO DIVERTSURFACE WATER1'Kumar & Associates
Install 6" valve box
at ground surface Insulate lid with 2"
blue board
1.5" Sch. 40,
threaded cap
1.5" Sch. 40,
90° long-sweep
or two 45°
elbows
Backfill valve box
to bottom of cap
with onsite soil
Orenco Orifice
Shields
Ground Surface
Cover Soil
Aggregate Bed
Sand Media
Kumar & Associates
Orenco Systems® Inc. , 814 Airway Ave., Sutherlin, OR 97479 USA • 800-348-9843 • 541-459-4449 • www.orenco.com NTD-SF-OS-1
Rev. 2.0, © 03/17
Page 1 of 1
Orifice Shields
Technical Data Sheet
General
Orenco Orifice Shields snap-fit onto laterals. They may be placed on
top of or beneath a lateral, depending on the location of the orifice.
Orifice shields are covered by method-of-use patent # 5,360,556.
Standard Models
OS075, OS100, OS125, OS150, OS200
Product Code Diagram
Material of Construction
PVC per ASTM D-1784
Physical Specifications
Model Shield O.D. Lateral pipe O.D.
in. (mm) in. (mm)
OS075 3.5 (89) 1.05 (27)
OS100 3.5 (89) 1.315 (33)
OS125 3.5 (89) 1.66 (42)
OS150 4.5 (114) 1.90 (48)
OS200 4.5 (114) 2.375 (60)
Applications
Orenco® Orifice Shields are used in a pressurized distribution system
to protect the orifices from backfill debris that might cause orifice
blockage.
Orifice shield installed on lateral pipe, standard configuration
Shield
Orifice
Cutaway view, standard configuration
Shield
Orifice
Cutaway view, cold weather configuration
OS
Lateral pipe size, nominal:
075 = 0.75 in. (20 mm)
100 = 1.00 in. (25 mm)
125 = 1.25 in. (32 mm)
150 = 1.50 in. (40 mm)
200 = 2.00 in. (50 mm)
Orifice shield
Pump Selection for a Pressurized System - Single Family Residence Project
21-7-486 / 136 Sage Grouse 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
50
40
1.50
None
4
6
40
1.50
3
56.5
40
1.50
1/8
3
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
57
24.7
3
0.9
3.9
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
4.3
1.8
0.0
0.1
0.1
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
5.3
0.6
17.9
23.8
gals
gals
gals
gals
Minimum Pump Requirements
Design Flow Rate
Total Dynamic Head
24.7
15.3
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: