HomeMy WebLinkAboutOWTS Design129 Cains Lane
Carbondale, CO 81623
970.309.5259
carla.ostberg@gmail.com
July 5, 2022 Project No. C1733
Darlene Snyder
174 Black Diamond Mine Road
Glenwood Springs, CO 81601
Subsurface Investigation and Onsite Wastewater Treatment System Design
4-Bedroom Residence
174 Black Diamond Mine Road
Garfield County, Colorado
Darlene,
CBO Inc. performed a subsurface investigation and completed an onsite wastewater treatment system
(OWTS) design for the subject residence. The 10-acre property is located outside of Glenwood Springs,
in an area where OWTSs and wells are necessary.
Legal Description: Section: 9 Township: 7 Range: 89 SWNENE
Parcel ID: 2395-091-00-016
SITE CONDITIONS A 4-bedroom, single-family residence presently exists on the property and is utilizing an existing OWTS
that not functioning properly. Garfield County Individual Sewage Disposal System Permit 2875
documents this system. The system consists of a 1250-gallon, two-compartment concrete septic tank
followed by four gravelless chamber trenches for a total of 42 ‘Standard’ Infiltrator® chambers. The
system was sized to accommodate 4 bedrooms. The permit received final approval from Garfield County
on December October 22, 1997.
We explored the sewer line between the septic tank and distribution box. There were no issues in the
sewer line. We located the distribution box and excavated for access. We jetted each sewer line to the
four trenches, and all were found to be saturated. The existing septic tank will remain in use and the
existing soil treatment area (STA) abandoned in place.
The residence is served by a private well located in the northeast corner of the property. We have
estimated the location of the well to the best of our ability. The well is greater than 50-feet from the
existing septic tank and greater than 100-feet from the proposed STA.
The proposed soil treatment area (STA) location has an approximate ten percent slope to the east.
There should be no traffic or staging of material over the future STA site to avoid compaction of soils
prior to construction of the STA.
Page 2
SUBSURFACE
The subsurface was investigated on June 8, 2022 by digging two soil profile test pit excavation (Test Pit). A
visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.1
The materials encountered in Test Pit #1 consisted of dark brown topsoil to 6-inches, underlain by medium
brown clay loam to 5-feet, underlain by reddish brown clay loam to a maximum depth explored of 6-feet
where we encountered an old sewer line and septic tank. No bedrock or groundwater was encountered.
The materials encountered in Test Pit #2 consisted of dark brown topsoil to 6-inches, underlain by medium
brown clay loam to 4-feet, underlain by reddish brown clay loam to a maximum depth explored of 6-feet,
underlain by gray silt loam to a maximum depth explored of 7.0-feet. No bedrock or groundwater was
encountered.
A sample of the soil was taken from Test Pit #2 at 3-feet below grade. Soil structure grade was
moderate. The soil formed a ball and a ribbon 1 to 2-inches in length before breaking. Soil structure
shape was blocky and consistence was friable to firm. Soil texture was both gritty and smooth.
STA sizing is based on Soil Type 3, Clay Loam with moderate structure grade. A long term acceptance
rate (LTAR) of 0.35 gallons per square foot will be used to design the OWTS.
Test pit #1 looking south Test Pit #1 (encountered old sewer line and septic tank)
1 Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile
Evaluation of Soils Training.
Page 3
Test Pit #2 Backfill
Test Pit #2 looking north Backfill
Page 4
Test Pit #2 sidewall Backfill (reddish brown near bottom)
Sieved sample Ribbon 1-2 inches in length
DESIGN SPECIFICATIONS The existing STA will be abandoned in place. If desired, a Bull Run Valve (or similar) can be placed on
the sewer line existing the septic tank. The valve can be closed to the existing system and the STA can
be rested for an extended time for drying and used as a back-up in the future.
Design Calculations:
Average Design Flow = 75 GPD x 2 people/bedroom x 3 Bedrooms + 75 GPD (4th Bedroom) = 525 GPD
LTAR = 0.35 GPD/SF
525 GPD / 0.35 GPD/SF x 1.0 (gravity trenches) x 0.7 (chambers) = 1050 SF
Page 5
The OWTS design is based on 4-bedrooms. An average daily wastewater flow of 525 GPD will be used.
For the purposes of this OWTS design, Benchmark Elevation has been established as 100’ as the sewer
line exiting the existing septic tank. CBO Inc. should be notified of any discrepancies or problems with
grade elevations of proposed components during installation of the OWTS.
OWTS Component Minimum Elevation
Distribution Box Approximate horizontal distance 20’ / min. 1% fall /
min. 2.5” fall
Infiltrative Surface Approximate horizontal distance to the furthest
trench 42’ / min. 1% fall / min. 5.25” fall
*Elevations are based upon standard OWTS installation practices. Component elevations may change during
installation due to site conditions. Minimum grade refers to piping between components.
The existing sewer line from the house to the septic tank will remain. The sewer line entering the septic
tank should be properly aligned. An Orenco® Biotube Effluent Filter should also be installed exiting
septic tank. If desired, a Bull Run Valve (or similar) may be installed on the sewer line existing the septic
tank to route effluent to the old STA as a back-up, once the STA has dried out. This could take a year or
more, depending on many factors. The new STA has been sized to accommodate the entire residence,
so the installation of this valve is optional.
A new 4-inch SDR-35 sewer line will be installed to a new distribution box. The distribution box must be
accessible from grade and must have flow equalizers, or similar product, installed on each outlet pipe in
the distribution box to assure equal flow to each trench.
Five gravelless chamber trenches will be installed. Each trench will consist of 18 ‘Quick 4’ Standard Plus
Infiltrator® chambers for a total of 1080 square feet of infiltrative area. There must be at least 4-feet of
undisturbed soil between each trench. Inspection ports must be installed at the beginning and end of
each trench. Ports may be cut to grade and placed in sprinkler boxes for access.
COMPONENT SPECIFICATIONS
The component manufacturers are typical of applications used by contractors and engineers in this area.
CBO Inc. must approve alternative components prior to installation of the OWTS. Requests must
be submitted, in writing, to our office for approval prior to installation. Component technical data
sheets are available upon request.
COMPONENT MANUFACTURER MODEL NO. COMMENTS
Effluent Filter Orenco® 4-inch diameter Full size
Bull Run Valve
(OPTIONAL)
BRVBULK
Distribution Box Polylok Distribution box, lids,
rises, and (5) flow
equalizers
Chambers Infiltrator® Standard Plus 90 ‘Quick 4’
Construction must be according to Garfield County On-Site Wastewater Treatment System Regulations, the
OWTS Permit provided by Garfield County Building Department, and this design.
Page 6
INSTALLATION CONTRACTOR
CBO Inc. expects that the installer be experienced and qualified to perform the scope of work outlined in this
design. The installer must review this design thoroughly and coordinate with our office in advance of
installation. Any additional conditions in this design or county permit must be completed and documented
prior to final approval of the OWTS installation. Communication between the installer and this office is
expected throughout the installation.
INSTALLATION OBSERVATIONS CBO Inc. must view the OWTS during construction. The OWTS observation should be performed before
backfill, after placement of OWTS components. Septic tanks, distribution devices, pumps, dosing
siphons, and other plumbing, as applicable, must also be observed. CBO Inc. should be notified 48 hours
in advance to observe the installation.
In an effort to improve the accuracy of the record drawing, we request that the installer provide a
sketch of the installation, including path of the sewer lines, water line installation (if applicable),
septic tank location, STA location, and measurements from building corners or another fixed
objects on the property. This sketch is most easily provided on Sheet W2.0 of the OWTS Design
Packet. Photographs of the installation and final cover are also requested to supplement our installation
documentation.
REVEGETATION REQUIREMENTS
An adequate layer of good quality topsoil capable of supporting revegetation shall be placed over the entire
disturbed area of the OWTS installation. A mixture of native grass seed that has good soil stabilizing
characteristics (but without taproots), provides a maximum transpiration rate, and competes well with
successional species. No trees or shrubs, or any vegetation requiring regular irrigation shall be placed over
the STA. Until vegetation is reestablished, erosion and sediment control measures shall be implemented
and maintained on site. The owner of the OWTS shall be responsible for maintaining proper vegetation
cover.
OPERATION INFORMATION AND MAINTENANCE
The property owner shall be responsible for the operation and maintenance of each OWTS servicing the
property. The property owner is responsible for maintaining service contracts for manufactured units,
alternating STAs, and any other components needing maintenance.
Geo-fabrics or plastics should not be used over the STA. No heavy equipment, machinery, or materials
should be placed on the backfilled STA. Machines with tracks (not wheels) should be used during
construction of the STA for better weight distribution. Livestock should not graze on the STA. Plumbing
fixtures should be checked to ensure that no additional water is being discharged to OWTS. For example, a
running toilet or leaky faucet can discharge hundreds of gallons of water a day and harm a STA.
If an effluent filter or screen has been installed in the OWTS, we recommend this filter or screen be cleaned
annually, or as needed. If the OWTS consists of a pressurized pump system, we recommend the laterals be
flushed annually, or as needed.
The homeowner should pump the septic tank every two years, or as needed gauged by measurement of
solids in the tank. Garbage disposal use should be minimized, and non-biodegradable materials should not
be placed into the OWTS. Grease should not be placed in household drains. Loading from a water softener
should not be discharged into the OWTS. No hazardous wastes should be directed into the OWTS.
Mechanical room drains should not discharge into the OWTS. The OWTS is engineered for domestic waste
only.
Page 7
ADDITIONAL CONSTRUCTION NOTES If design includes a pump, weep holes must be installed to allow pump lines to drain to minimize risk of
freezing. The pump shall have an audible and visual alarm notification in the event of excessively high-
water conditions and shall be connected to a control breaker separate from the high-water alarm breaker
and from any other control system circuits. The pump system shall have a switch so the pump can be
manually operated.
Excavation equipment must not drive in the excavation of the STA due to the potential to compact soil.
Extensions should be placed on all septic tank components to allow access to them from existing grade.
Backfill over the STA must be uniform and granular with no material greater than minus 3-inch.
LIMITS: The design is based on information submitted. If soil conditions encountered are different from conditions
described in report, CBO Inc. should be notified. All OWTS construction must be according to the county
regulations. Requirements not specified in this report must follow applicable county regulations. The
contractor should have documented and demonstrated knowledge of the requirements and regulations of
the county in which they are working. Licensing of Systems Contractors may be required by county
regulation.
Please call with questions.
Sincerely,
CBO Inc.
Carla Ostberg, MPH, REHS
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GARFIELD COUNTY BUILDING AND SANITATION , DEPARTMENT Permit 287 a
109 (ith Street Suite 303 Assessor's Parcel No.
Glenwood Springs, Colorado 81601
Phone (303) 945-8212
This does not constitute
INDIVIDUAL SEWAGE DISPOSAL PERM a building or use permit.
PROPERTY
Owner's Name Gerald I. Tfmlas P resent Address 0174 CR 126 Glenwood Phone 945 -4413
System Location 0174 County Road' 126, Glenwood Springs
Legal Description of Assessor's Parcel No.9 I) FLOC - GEACk - 13 et° Lour n 1 6{
ft or Patti ss 0 if CtoaAdEn PO lo 2SSYSTEMDESIGN6prt' y 6 1)1 T AtNCCfES
1 2SO if Pr „ CM `1)1•
a en- R
1
Septic Tank Capacity (gallon)Other t Geo >a'
it e1,1 N
J /`Percolation Rate (minutes /inch) Number of Bedrooms (or other)
4
Required Absorption Area - See Attached
Special Setback Requirements:
Date 1 0 – 1.3 – `17 Inspector Act fY
FINAL SYSTEM INSPECTION AND APPROVAL (as installed)1
Call for Inspection (24 hours notice) Before Covering Installation
System Installer Joe t p M O i A
Septic Tank Capacity
1 2 S O
ASepticTankManufacturerorTradeNameCQr t 1 4 t
Septic Tank Access within 8" of surface E,$
Absorption Area G tT o isR el) 7 rwHC Pi c S
Absorption Area Type and /or Manufacturer or Trade Name 1 M plc 7 ti-A7 O as c
Adequate compliance with County and State regulations /requirements Y es
Other
e
Date Q _ V AJInspector a g c
RETAIN WITH RECEIPT RECORDS AT CONSTRUCTION SITE
CONDITIONS:
1. All Installation must comply with all requirements of the Colorado State Board of Health Individual Sewage Disposal Systems Chapter
25, Article 10'R.R.S. 1973, Revised 1984.
2. This permit is valid only for connection to structures which have fully complied with County zoning and building requirements. Con-nection to or use with any dwelling or structures not approved by the Building and Zoning office shall automatically be a violation or e
requirement of the permit and cause for both legal action and revocation of the permit.
3. Any person who constructs, alters, or installs an individual sewage disposal system in a manner which involves a knowing and materialvariationfromthetermsorspecificationscontainedIntheapplicationofpermitcommitsaClassI, Petty Offense ($500.00 fine -8
months in Jail or both).
White - APPLICANT Yellow - DEPARTMENT
PQWER A
EQUIPMENT COMPANY OW•• eIu°••••• CO. )
DENVER GRAND JUNCTION CASPER ALBUQUERQUE
303 - 288 -8801 303 -243 -0722 307 - 577 -9700 505 -344 -9488
303 -288 -8809 FAX 303- 243 -0728 FAX 307- 577 -9703 FAX 505 -345 -4715 FAX
800- 883 -9284 800 -898 -7319 800 -883 - 9275 800 -880 -2320
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CEDARAPIDS • CHAMPION • EL JAY • EAGLE • EUCLID • HITACHI • HYPAC
PREMIER - PEERLESS • RAMMER • VOLVO CONSTRUCTION EQUIPMENT
ACCESSORY LINES
BRUNNER & LAY • BUCYRUS BLADES • COLUMBIA STEEL • CUMMINS
DIPACO • HELSER MACHINE PARTS • INTERTRACTOR • IRATHANE SYSTEMS
KAWASAKI • LUDLOW- SAYLOR • MINNPAR • SPOKANE STEEL FOUNDRY
SUPERIOR CONVEYOR PARTS • WEG ELECTRIC MOTORS • WESTERN WIRE
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INDIVIDUAL SEWAGE DISPOSAL SYSTEM APPLICATION
OWNER 7 C 5 o 455o
ADDRESS 0/ 7/ / 4 Ola>PHONE 91 /5 - W/3
CONTRACTOR N tOt I9ft? QR J
ADDRESS 10 AVi p/y PHONE 9a7327
PERMIT REQUEST FOR NEW INSTALLATION ALTERATION REPAIR
Attach separate sheets or report showing entire area with respect to surrounding areas, topography of rea,
habitable building, location of potable water wells, soil percolation test holes, soil profiles in test holes (See page 41.
LQCATION OF PROPOSED FACILITY:
p/. , UNearwhatCityofTownOZIfi/ ,(/O/Size of Lot O / (
Legal Description or Address L54 : Q /T
WASTES TYPE:X DWELLING TRANSIENT USE
COMMERCIAL OR INDUSTRIAL NON - DOMESTIC WASTES
OTHER - ` DESCRIBE
BUILDING OR SERVICE TYPE:ND6
Number of Bedrooms Number of Persons D
X Garbage Grinder pc Automatic Washer Dishwasher
SOURCE AND TYPE OF WATER SUPPLY: WELL SPRING STREAM OR CREEK
If supplied by Community Water, give name of supplier:Ww t 1 \(L
DISTANCE TO NEAREST COMMUNITY SEWER SYSTE NV4 I 0 9L-DC
Was an effort made to connect to the Community System?
A site plan is required to be submitted that indicates the following MINIMUM distances:
Leach Field to Well:100 feet
Septic Tank to Well:50 feet
Leach Field to Irrigation Ditches, Stream or Water Course:50 feet
Septic System to Property Lines:10 feet
YOUR INDIVIDUAL, SEWAGE DISPOSAL SYSTEM PERMIT WILL NOT BE ISSUED
WITHOUT A SITE PLAN.
CROlIND CONDITIONS:
Depth to first Ground Water Table 1 S C 1 I' ` (( (
Percent Ground Slope
2
TYPE OF INDIVIDUAL SEWAGE DISPOSAL SYSTEM PROPOSED:
9( SEPTIC TANK AERATION PLANT VAULT
VAULT PRIVY COMPOSTING TOILET RECYCLING, POTABLE USE
PIT PRIVY INCINERATION TOILET RECYCLING, OTHER USE
CHEMICAL TOILET OTHER - DESCRIBE
FINAL DISPOSAL BY:
ABSORPTION TRENCH, BED OR PIT EVAPOTRANSPIRATION
UNDERGROUND DISPERSAL SAND FILTER
ABOVE GROUND DISPERSAL WASTEWATER POND
OTHER - DESCRIBE
WILL EFFLUENT BE DISCHARGED DIRECTLY INTO WATERS OF THE STATE?
pERCOT,ATION TEST REST TITS: (To be completed by Registered Professional Engineer, if the Engineer does
the Percolation Test)
Minutes per inch in hole No. 1 Minutes per inch in hole NO. 3
Minutes per inch in hole No. 2 Minutes per inch in hole NO.
Name, address and telephone of RPE who made soil absorption tests:
Name, address and telephone of RPE responsible for design of the system:
Applicant acknowledges that the completeness of the application is conditional upon such further mandatory and
additional tests and reports as may be required by the local health department to be made and furnished by the
applicant or by the local health department for purposed of the evaluation of the application; and the issuance of the
permit is subject to such terms and conditions as deemed necessary to insure compliance with rules and regulations
made, information and reports submitted herewith and required to be submitted by the applicant are or will be
represented to be true and correct to the best of my knowledge and belief and are designed to be relied on by the
local department of health in evaluating the same for purposes of issuing the permit applied for herein. I further
understand that any falsification or misrepresentation may result in the denial of the application or revocation of any
permit granted based upon said application and in legal action for perjury as provided by law.
LagA 1, y
Signed 1 Date 1 7
PLEASE DRAW AC CL7RATEl YO O1TY!!
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EXHIBIT A
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H %:j,- :"r,;•:- . ::e' =T. ^Year= : ?, ° +;;5wh8tkNE:, Section 9, Township 7 South, Range 89 Nest of the 6thPrincipalMeridian. TOGETHER with a 60 foot easement situated in
C•Lot 1 of Section 9, and Lot 1 of Section 10, all in Township 7
w J South, Range 89 West of the Sixth Principal Meridian, being 30 feetoneachsideofthefollowingdescribedcenterline:
Beginning at a point on the Northerly line of said Lot 1, of saidSection9, whence the Northeast Corner of said Lot 1 bears:S. 89'46'0 E. 647.07 feet; thence along said centerline5. 16'02'31" E. 159.98 feet; thence 35.06 feet along the arc of acurvetotheright, having a radius of 47.86 feet, the chord of whichbears: 5. 69 ° 51'40" E. 34.28 feet; thence S. 48'52'31" E. 108.05feet; thence 76.42 feet along the arc of a curve to the left, havingaradiusof104.75 feet, the chord of which bears S. 69 E. 74.feet; thence U. 09'19'29" E. feet: thence 116.47 feet along thearcofacurvetotheleft, having a radius of 196.66 feat, the chordofwhichbears: N. 72'21'29" E. 114.78 feet; thence N. 55'23'29" E.147.76 feet; thence 101.36ffeet along the arc of a curve to the right
94.95
having feet; thence S. 53'21''35 " E. 112.29 ofeet; cthens 0 03"
ce67.57feet
along the arc of a curve to the left, having a radius of 105.02 feet,
mrl ystrxw.m'i A.D iW 6t the chord of which bears: S. 71'47'30' E.. 66.41 feet, more or Tess, t•a point on the Westerly right of way line of the Four Mill County Roo.
as constructed and in place.
COUNTY OF GARFIELD
STATE OF COLORADO
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6/1/22, 9:05 AM qPublic.net - Garfield County, CO - Property Record Card: R080013
https://qpublic.schneidercorp.com/Application.aspx?AppID=1038&LayerID=22381&PageTypeID=4&PageID=9447&KeyValue=R080013 1/2
Gar eld County, CO
View Map
SNYDER, DARLENE
0174 COUNTY ROAD 126
GLENWOOD SPRINGS CO 81601
Building #1
Units 1
Building Type SFR
Abstract Codes / (Property Type)SINGLE FAM.RES-IMPROVEMTS-1212 (RESIDENTIAL PROPERTY)
Architectural Style 1-STRY/BSM
Stories 1
Frame WOOD FRAME
Actual Year Built 1974
Basement Area 725
Finish Basement Area 725
Gross Living Area 2,091
Total Heated SqFt 2,816
Bedrooms 3
Baths 2.25
Heating Fuel ELECTRIC
Heating Type ELEC BS BD
Air Conditioning NONE
Roof Type GABLE
Roof Cover CEDAR SHAK
Assessed Year 2022 2021 2020
Land Actual $190,000.00 $190,000.00 $190,000.00
Improvement Actual $402,720.00 $402,720.00 $369,050.00
Total Actual $592,720.00 $592,720.00 $559,050.00
Assessed Year 2022 2021 2020
Land Assessed $13,210.00 $13,590.00 $13,590.00
Improvement Assessed $27,990.00 $28,790.00 $26,390.00
Total Assessed $41,200.00 $42,380.00 $39,980.00
Tax Year 2021 2020 2019 2018
Taxes Billed $3,369.72 $3,002.52 $3,026.40 $2,760.36
Click here to view the tax information for this parcel on the Gar eld County Treasurer's website.
Sale Date Deed Type Reception Number Book - Page Sale Price
1/5/2021 SUPPLEMENTAL AFFIDAVIT 948982 $0
8/30/1999 QUIT CLAIM DEED 551320 1148-228 $0
8/30/1999 WARRANTY DEED 551319 1148-226 $297,000
8/30/1985 WARRANTY DEED 364615 0674-0769 $170,000
10/15/1977 WARRANTY DEED 281468 0502-0196 $107,000
Summary
Account R080013
Parcel 239509100016
Property Address 174 126 COUNTY RD, GLENWOOD SPRINGS, CO 81601
Legal Description Section: 9 Township: 7 Range: 89 SWNENE
Acres 10
Land SqFt 0
Tax Area 131
Mill Levy 79.5120
Subdivision
Owner
Land
Unit Type SINGLE FAM.RES.-LAND - 1112 (RESIDENTIAL PROPERTY)
Square Feet 0
Buildings
Actual Values
Assessed Values
Tax History
Transfers
Garfield County, CO
Developed by
Account
Number
R080013
Par cel Number 239509100016
Acr es 10
Land SqFt 0
T ax Ar ea 131
2019 Mill Levy 79.5120
Physical
Addr ess
174 126 C OUNTY RD
GL ENWOOD SPRINGS 81601
Owner A ddr ess SNYDER, DARLENE
0174 C OUNTY ROAD 126
GL ENWOOD SPRINGS C O
81601
2019 T otal Actual
Value
$592,720 Last 2 Sales
Date Pr ice
1/5/2021 $0
8/30/1999 $0
Date created: 6/1/2022
Last Data Uploa ded: 6/1/2022 2:10:35 AM
461 ft
Overvi ew
Legend
Parcels
Roa ds
Parcel/Account
Number s
Highw ays
Limited Access
Highwa y
Major Road
Loca l Roa d
Minor Road
Other Road
Ra mp
Ferry
Pedestria n Way
Owner Na me
Lakes & River s
County Boundar y
Line