HomeMy WebLinkAboutEngineer's Report 05.22.201533 Four Wheel Drive Rd
Carbondale, CO 81623
970-309-5259
REF 11
May 22, 2015
Simon Bentley
Crawford Design Build
cbdsimon& comcasLnet
Onsite Wastewater Treatment System Design
4 -Bedroom Residence
110 Sopris Lane
Garfield County, Colorado
Simon,
Project No. C1148
ALL SERVICE septic, LLC has completed an onsite wastewater treatment system (OWTS) design for the
subject residence. The property is located outside of Carbondale, in an area where OWTSs are
necessary.
Legal Description: Callicotte Ranch Subdivision, Lot 18, Amended #754313
SITE CONDITIONS
The property is currently undeveloped. A 4 -bedroom, 3575 square foot residence is proposed.
The subdivision is served by a community water system. Water lines must be greater than 25 -feet from
any OWTS component.
The proposed STA location has approximately an eleven percent slope to the southwest across the
proposed soil treatment area (STA).
There are no potential future land use changes or bedroom additions planned for the property.
SUBSURFACE
The subsurface was investigated by running percolation tests on February 25, 2015 by HP Geotech. The
investigation is documented in a letter dated March 6, 2015 under Job No. 115 035A. A soil profile pit was
also excavated as part of the subsurface investigation.
Percolation test results are documented between 20 and 30 minutes per inch, with percolation test holes
having a depth between 32 and 36 -inches.
A soil profile pit was excavated to a maximum depth explored of 8 -feet. No bedrock or groundwater was
encountered. The gradation and hydrometer analysis performed by HP Geotech shows the soil consists
of 4% gravel, 31% sand, 47% silt, and 18% clay. The USDA soil type is classified as Loam,
STA sizing is based on Soil Type 2A, Loam. A long term acceptance rate (LIAR) of 0.5 gallons per
square foot will be used to design the OWTS, in accordance with Table 10-1 presented in the
Garfield County On -Site Wastewater Treatment System Regulations, adopted April 14, 2014.
Page 2
DESIGN SPECIFICATIONS
The OWTS design is based on 4 -bedrooms_ An average daily wastewater flow of 450 GPD will be used_
DesignCalculations:
Average Design Flow = 75 gal/day x 2 people/ bedroom x 3 bedrooms + 75 gallons (4th bedroom) = 525
GPD
LTAR = 0.5 GPD/SF
525 GPD / 0.5 GPD/SF x 1.0 (gravity trenches) x 0.7 (chambers) = 735 SF
The system installation will include a 1250 -gallon, two-compartment concrete septic tank an effluent filter
on the outlet tee of the septic tank. Effluent will gravity flow to a distribution box, which must be
accessible from grade. Flow regulators must be utilized to assure equal flow to each outlet of the
distribution box.
The STA will consist of five rows of 13 'Quick 4' Infiltrator® chambers for a total area of 780 square feet
of infiltrative area. The infiltrative area may not exceed 4 -feet below native grade. There must be at least
6 -feet of undisturbed soil between the trenches. Inspection ports must be installed at both the beginning
and ends of each trench.
The component manufacturers are typical of applications used by contractors and engineers in this area.
Alternatives may be considered or recommended by contacting our office_ Construction must be
according to Garfield County On -Site Wastewater Treatment System Regulations, the OWTS Permit
provided by Garfierd County Building Department, and this design.
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 irritation 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,
altemating STAs, and any other components needing maintenance.
Geo -fabrics or plastics should not be used over the absorption area. No heavy equipment, machinery, or
materials should be placed on backfilled STAs. 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.
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 3
ADDITIONAL CONSTRUCTION NOTES
If design includes a pump, air release valves and 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 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.
INSTALLATION OBSERVATIONS
ALL SERVICE septic, LLC must view the OWTS during construction. The OWTS observation should be
performed before backfin, after placement of OWTS components. Septic tanks, distribution devices,
pumps, dosing siphons, and other plumbing, as applicable, must also be observed. ALL SERVICE septic,
LLC should be notified 48 hours in advance to observe the installation.
LIMITS:
The design is based on information submitted. If soil conditions encountered are different from conditions
described in report, ALL SERVICE septic, LLC 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,
ALL SERVICE septic, LLC
(iv, Ccs L r)6- -h
Carla Ostberg, MPH, REHS
Reviewed By:
Richard H. Petz,
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DISTRIBUTION BOX
Project Number. C1148
Item #
1250T-2CP
1250 Gallon Top Seam
Two Compartment
ALLOWABLE BURY
(Based on Water Table)
WATER TABLE
EARTH FILL
EARTH
0' - 0'
2 - 0'
1'-0'
3' -or
2'- 0'
3'- Or
3'- O'
4'- 0'
DRY
4'-O'
135"
Section
DESIGN NOTES View
• Design per performance test
per ASTM C1227
• Top surface area 56.25 it'
• fc @ 28 days; concrete = 6,000
PSI Min.
Installation:
• Tank to be set on 5" min. sand
bed or pea gravel
• Tank to be bacidlled uniformly on
all sides In lifts less than 24' and
mechanically compacted
• Excavated material may be used for
back ill, provided large stones are
removed
• Excavation should be dewatered and
tank filled with water prior to being
put in service for Installation with
water table less than 2' below grade
• Meets C1644-06 for resident connectors
• Inlet and Outlet identified above pipe
• Delivered complete with internal piping
• PVC or concrete risers available
• Secondary safety screen available with
PVC riser
• Option of pump or siphon Installed
'See installation guide on our website
Dlggirng Specs Invert
Dimensions
13' Long x T Wide Inlet Outlet Length Width Height
56" below inlet invert 56" 53" 135" 60" 68"
Net
Inlet Side Outlet Side Total
843 gallons 418 gallons 1,259 gallons
Net Weight
Lid Tank Total
3,120 lbs 10,880 lbs 14,000Ibs
Water & (719) 395.6764 29005 Co. Rd. 317
Wastewaf�sr P.O. Bot 925
o VALLEY • Systems BuemVbda, 0081211
• ystel:tS Fax (719) 395-3727
PRECAST, inc. • Service Weblike: www.valleyprecaet.com
Ema11:frontdesleavalleYPrecastcom
Residential Biotube® Effluent Filters
Applications
Our patented* 4 -In. (100 -mm) Biotube Effluent Filters, Biotube Jr., Biotube
Insert Filters, and Biotube Base Inlet Filters are ideal for residential septic
tanks and have a lifetime warranty. They prevent Iarge solids from Ieaving
the tank, dramatically improving wastewater quality and extending the life
of residential drainfields.
4 -in. (100 -mm) Biotube Effluent Filter
'PCI
4 -in. 000 -mm) Biotube Jr.
(4 -in. Biotube cartridge avail-
able separately as Insert Filter)
8•in. (200 -nim)
Base Inlet Filter
4 -in. (100 -mm)
Insert Filter
Orenco's superior effluent filters resist clogging better than all other brands. Our stan-
dard, full-sized 4 -in. (100 -mm) Biotube Effluent Filter provides maximum long-term
protection in a complete package, with housing. Our 4 -in. (100 -mm) Biotube fr. at
half the size of our standard model bas morefiltering capacity than the full-sized filters
sold by other manufacturers. For tanks with existing outlet tees. the Biotube Insert Filter
is ideal. And for low -profile tanks. there's the Base Inlet Filter.
• Covcrcd by patent numbers 5.491635 and 4.439.323
To Order
Call your nearest Orenco Systems®, Inc- distributor. For nearest distribu-
tor, call Orenco at 800-348-9843 or go to www.orenco.com and click on
"Distributor Locator."
APS -FT -1
Rei. 3.4 011/10
Omen Systeme, Inc.
Standard Features & Benefits
• Has 5-10 times
more flow area
than other brands,
so lasts many
times longer
between clean-
ings, increasing
homeowner
satisfaction
• Installs in min-
utes inside new
or existing tanks;
extendible tee
handle for easy
removal
Optional
Features &
Benefits
• Alarm available, to
signal the need for
cleaning
• Flow modulating
discharge orifices
available to limit
flow rate leaving
tank, mitigat-
ing surges and
increasing
retention time
• Custom and
commercial sizes
available
• Easy to clean by
simply hosing off
whenever the tank
needs pumping
• Removes about
two-thirds of sus-
pended solids, on
average, extending
drainfield life
• Corrosion -proof
construction, to
ensure long life
• Lifetime warranty
Biotube
Filtering
Process
Effluent from the
relatively clear zone
of the septic tank,
between the scum
and sludge layers,
horizontally enters
the Biotube Effluent
Filter. Effluent then
enters the annular
space between the
housing and the
Biotubes, utilizing
the Biotubes' entire
surface for filtering.
Particles larger than
the Biotube's mesh
are prevented from
leaving the tank.
asp
Orenco Systems
Incorpora'eo
Changing she ti ty the
Mold AM t .men uter
www.orenco.com
Nomenclatures
4 -in. Biotube Filter (standard)
FT000400-00
I Options:
Blank = no options
M = flow modulation plate installed
A = float bracket attached
Cartridge height: 28' and 36" aro standard
Housing height: 36" and 44' are standard
Alter diameter (inches)
W = fits Type 3034 outlet pipe
S = fits Schedule 40 outlet pipe
Blank = 118" filtration
P = 1116' filtration
Blotrme effluent filter series
8 -in. Biotube Filter (base inlet model)
FT 0 08 22-14 B
Optlons
A = float bracket
FS - 2" outiet orifice
FSG = 2' outlet orrice and overflow pl:itt_"
Base inlet mode
Cartridge height 14" standard
Housing height: 22' standard
Ther diameter (inches)
08 = B'
Blank = 1/8" filtration
P = 1116' filtration
Biotube effluent fitter series
` Also avallabia with coupling and sleeve as a "kit` FT OVEEFLOWI4T
4 -in. Biotube Jr. (includes cartridge and housing)
FT.! 0004 18
I Options:
Blank = no options
M = flow modulation plate installed
A = float bracket attached
Cartridge height (inches)
Filter diameter (inches)
W = Ills Type 3034 outlet tee
S = tits Schedule 40 outlet tee
Blank = 1/8" filtration
P = 1116' filtration
Junior series
Biotube effluent filter series
4 -in. Biotube Filter Insert (cartridge only)
FT 0 0418 -0-
For customized options (e.g. NC
indicates North Carolina regions)
W = filsType 3034 outlet lee
5 = fits Schedule 40 outlet tee
Cartridge height (inches)
Filter diameter (inches)
Blank = 118" filtration
P = 1116" filtratdo i
Insert
Biotube effluent fitter series
4 -in. Biotube
Effluent Filter
Extendible PVC handle
4 -in. Biotube Jr.
Stainless steel set screws
Top seal plate
Air vents
Biotube® filter cartridge
Solid base
— Riser
t wall
Filter housing — —
Tank wall
Distributed By:
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