HomeMy WebLinkAboutSubsurface Investigation & OWTS Design'•
A L
•
Four Wheel Drive Rd
Carbondale, CO 11623
970-309-5259
~rn~t~l ~ , ' r.
May 6, 2015
Joe and Chris Striefel
trurealestate@gmail.com
Subsurface Investigation and Onsite Wastewater Treatment System Design
2-Bedroom Residence (4-Bedroom OWTS Design)
700 Lions Ridge Road
Garfield County, Colorado
Joe and Chris,
Project No. C1131
ALL SERVICE septic, LLC performed a subsurface investigation and 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: Lot 4, Lions Ridge Estate
SITE CONDITIONS
The property is currently undeveloped. A 2-bedroom, single-family residence is planned, with the
possibility of 2 future bedrooms.
A community water system will serve the residence with potable water. The water line coming into the
residence will be more than 25-feet from both the proposed septic tank and soil treatment area (STA).
The proposed STA location has approximately a 14 percent slope to the south toward the Roaring Fork
River. The slopes drops steeply to the south below elevation line 964'. The proposed STA location is
covered with native grasses and sagebrush.
SUBSURFACE
The subsurface was investigated on March 26, 2015 by digging two soil profile test pit excavations (Test
Pits). A visual and tactile soil analysis was completed by Carla Ostberg at the time of excavation.1
The materials encountered in the Test Pit #1 consisted of dark brown topsoil to 2.0-feet, underlain by light
brown to tan loamy sand to a maximum depth explored of 6 .0-feet. No bedrock or groundwater was
encountered.
The materials encountered in Test Pit #2 were consistent with those encountered in Test Pit #1 . The
Test Pit was explored to a maximum depth of 7.5-feet. No bedrock or groundwater was encountered.
A tactile analysis of the soils was taken from Test Pit #1 at 3-feet below grade. The soil formed a ball,
but did not form a ribbon. Soil structure shape was granular, soil structure grade was moderate, and
consistence was friable .
1 Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile
Evaluation of Soils Training.
·.
Page2
STA sizing is based on Soil Type 1, Loamy Sand with granular structure type and moderate structure
grade. A long term acceptance rate (l TAR) of 0.8 gallons per square foot will be used to design
the OWTS , in accordance with Table 10-1 Soil Type 1 presented in the Garfield County On-Site
Wastewater Treatment System Regulations, adopted April 14, 2014.
Test Pit #1
View of test pit #1
Sidewall of test pit
Test Pit sidewall
\ ..
Backfill from test pit
Page 3
DESIGN SPECIFICATIONS
Design calculations will be based on 4-bedrooms. A wastewater design flow of 525 gallons per day will
be used.
Design Calculations:
Average Design Flow= 75 x 2 x 3 Bedrooms= 450 GPO + 75 (4th bedroom) = 525 GPO
LTAR = 0.8 GPO/SF
525 GPO x 48 hour retention time = min. 1250 gallons
525 GPO I 0.8GPO/SFx1.0 (gravity trenches) x 0.7 (chambers)= 459 SF
459SF/12 SF/chamber= min. 38 chambers
The system installation will include a new 1250-gallon, two-compartment concrete septic tank with an
effluent screen on the outlet tee. We recommend the Orenco® effluent filter, specification attached. A
distribution box, accessible from grade, must also be installed. The STA will consist of four gravelfess
chamber trenches, each with 10 'Quick 4' Infiltrator® chambers for a total of 40 chambers and 480
square feet of infiltrative area. Inspection ports must be placed in the end plates at the beginning and
end of each trench. These ports may be cut to grade and covered with a sprinkler box.
Trenches should be kept as shallow as possible, with the infiltrative area installed just below the topsoil
horizon. There must be at least 6-feet of undisturbed soil between each trench. The trench location
should be placed as close to the house as possible, while maintaining the required 20-foot setback,
allowing as much separation as possible from where the slope drops steeply to the south.
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 Garfield 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,
alternating 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
Page4
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.
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 backfill , 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 Re vi ewed By:
~~))
Carla Ostberg, MPH, REHS
Liability Clause: Under no circumstances whatsoever shall the liability of ALL SERVICE septic, LLC, in connection with
any contract , directly or indirectly, exceed the total amount paid by the cfient to ALL SERVICE septic, LLC for the services
and/or goods which are the subject of the contract in connection with which the liability arises.
Item#
1250T-2CP
Top
ALLOWABLE BURY View
(Ba88d on Water Table)
WATER TABLE ALLOWABLE
EARTHFll
O' -0" 2!-0"
1·-0· 3'-O"
2!-O" 3'-O"
3'-0" 4'-0"
DRY 4'-0"
DESIGN NOTES
• Design per perf'onnance test
per ASTM C1227
• Top surface area 56.25 ft2
• fc @ 28 days; concrete = 6,000
PSI Min.
lnatallatlon:
• Tank to be set on 5" min. sand
bed or pea gmvel
• Tank to be backfilled uniformly on
all sides In lifts less than 24• and
mechanically compacted
• Excavated material may be used for
backfill, provided large stones are
removed
• Excavation should be dewalefVd and
tank filled with water prior to being
put In service for Installation with
water table less than 2' below grade
56"
• Meets C1644-06 for resUlent connectors
• Inlet and OuUet 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
1250 Gallon Top Seam
Two Compartment
-----135"----· ____;..
! 60" 1 .
1~
_..,. .-. .J .. :L._ ~ _J_~
• • ' •. • • ... 'O ." • •I •• I I • .•. ~ • • • ~
Digging Specs Invert
13' Long x 7' Wide Inlet Outlet Length Width
56" below inlet invert 56" 53" 135" 60"
NltC~
Inlet Side ' Outlet Side Tolal
843 gallons 416 gallons 1.259 gallons
Nit Weight
Ud T•nk Tot.I
3, 120 lbs 10,880 Iba 14,000 Iba
Height
68"
Water&
Wastewater (719) 395-8784 2B005 CA Rd. 317
P.O.Boc925
t 0 VALLEY •Systems
•Products Fax: (719) 395-3727 Buena\llsta, COS1211
Website: www.valleyprecast.oom 0 PRECAST, lac. •Service Emall: frontdesk@valleyprecast.am
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Applications
Our patented• 4·in. {I OO·mm) Biocube Effiuent Filcers, Biorube Jr., Biocube
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the cank, dramatically improving wastewater quality and extending the: life
of residential drainficlds.
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ll 'l
••
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~
8-ilJ. (200-111111)
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~.1 :f
1 .
4·in. ( 100-111111)
/11s1•n Filti•r
J(
\' r
Ormmi supawr 1jj/11mt jiltas rt•sist c/(}g,giug b1•tt1•r than 111/ (}fher lmwrls. Our Sftlll·
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so/rl /~1· 11th1•r 11111111t}rct11ras. For fllnks with t'.\"isri11g 1111tl1·t t1't'S, the Bio111hr Insert 1-iltt'I'
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To Order
Call your 111.:.ucsc Orcnco Systems", Inc. distributor. For nc:arc:st discribu ·
tor, call Orcnco at 800·348·9843 or go to www.orcnco.com and click on
"Disrribmor Loe.nor."
APS·FT·l
Rev. 3.4 CC> 11/10
Orenco Systems"'. 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
Filler. 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.
Orenco Systemst
Incorporated
Chm1gi11g 1hr 1r~1· 1hr
\\"i1rU Dors \\w1r11•a1rr N
www.orenco.com
Nomenclatures
4-in. Biotube Filter (standard )
FT 00 04 0D -DDD
1Topt1ons
Blank no optt0ns
M Uow modldatjon p!ate lflSla:led
A -float blacket at~1che0
Cartridge heigh! 20· and 36" aic staildard
Hous119 heigh! 36 " and 44• are s!<ma1d
Frltcr drame1e1 (mdresl
W = I.ts Type 3034 outiel p:pe
S = I.ts Schedule 40 outlet pipe
B!ank = 110· f.!!Jalion
P = 1/16" li:uatoo
l!lotulJc etfkJCr.l IJ1ci seues
8-in. Biotube Riter (base inlet model)
FT Oos 22.14 sD
1
-,-;ons·
A float \Jraclo.cl
FS 2" outlet Of~ICC
FSO 2" outlet m lice and ovc1flow p'atc·
Base rnie1 model
Gart11d9e liet!)ht 14 • s:andard
Housmg hc'!)ht 22" s:andard
fiaer d:amctci (inches)
08 = 8"
B:ank = 1/8" f1illa!1on
P = 1/Hl" f;ltration
B.otuhe eflluem f1:icr series
• A.'So av:i.!a\Jlc 1·r.th coup:"19 and slre.-e as a ·kit· FT ·OVERFLOWKlT
4-in. Biotube Jr. (includes cartridge and housing)
FT J 00 0418 0
w s
1--r;ons
Blank = no ~tKH1S
M = fi01·1 mod11taMn p!a:c 1nsta!ied
A = lloat lpockel atta<:hcO
Cartri1k)e heiglll (.nchcsl
rn:cr diame:er (inches)
l.!S Type 3034 oullel ICC
r.:s Schellu!c 40 ou:lct tee
Blank 110· f,arat:on
P 1116" !Ulia:101
Jull:OI series
4-in. Biotube Riter Insert !cartridge onlyl
FT i Do4 18 -0 -D
11 !;for customized op!1011s (cg NC
1rld1CJ:cs f1orlh Caro:uia 1cg ons1
W = f.ts Type 303~ ou\ict tee
S • I.ts Schclfu'.e 40 outlet !ec
Canud\Jc height (iochcsl
F i!te1 d:ame:er (nches)
B!ank 118 · l.l!Ja:1011
p ~ 1/16" r.aration
lnsen
B o:ubc clhtcnt l1ltc1 series
4-in. Biotube
Effluent Riter
4-in. Biotube Jr.
,----,.___ Extendible PVC handle _...r-.,.
1---Filt er housing ---11
000
Distributed By:
o· 25' 50'
Scale: 1" = 50'-0"
~·· .. ·.
"( \ ···· ... ("_·.·.:::.-....
~ ~-· -~-
' 4-BE~ ol I M RESIDENCE "---------. I
t------------__ .... :
I ~I
l" J ~""=---=-" - - - - - --__.,,,,,
33 Four Wheel Drive Road
Carbondale, Colorado 81623
Phone 970.309.5259
carla@allserviceseptic.com
DROPS
STEEPLY TO
SOUTH
LOT4
2.47 ACRES
CD SITE PLAN
11 • w'-o'
Stouffer Residence
700 Linons Ridge Road
Garfield , County
Project Number: C1131
DRAWINGS MUST BE USED IN
CONJUNCTION WITH DESIGN
LEITER DATED 5/8/15
Date: 05/08115
Designed By: CBO w 1 . 0
Reviewed By: RHP
Drawn By: ANG Sheet 1 of 4
N
~
I I I
O' 10' 20'
Scale: 1 • = 20'-0"
ALL L ~rn1m1 W
'-------
~
33 Four Wheel Drive Road
Carbondale, Colorado 81623
Phone 970.309.5259
carla@allserviceseptic.com
'
35.0'
4-BEDROOM
RESIDENCE
~
8
0
N
0
~----4' DIA SDR-35 SEWER LINE WITH
DOUBLE-SWEEP CLEANOUT
(MIN 2% SLOPE TO TANK)
-------1250-GALLON,
TWO-COMPARTMENT,
CONCRETE SEPTIC TANK WITH
EFFLUENT SCREEN
_:--4" DIA SDR-35 SEWER LINE
(MIN 1% SLOPE TOD-BOX)
z
~ ~ ~ ............_ D-BOX ACCESSIBLE FROM
'----4·0'----1
NOTE:
TRENCHES TO STAY AS CLOSE
TO HOUSE AS POSSIBLE WHILE
MAINTAINING MIN 20' SETBACK
(2) PROPOSED OWT~. ··' ·'
Stouffer Residence
700 Linons Ridge Road
Garfield, County
Project Number: C 1131
GRADE
------4" DIA SDR-35 SEWER LINE (MIN
1 % SLOPE TO TRENCH)
------INSPECTION PORT AT
BEGINNING AND END OF EACH
TRENCH
----'QUICK-4' CHAMBER TRENCHES.
4 ROWS OF 10 CHAMBERS= 40
CHAMBERS= 480 SF
Date: 05108115
Designed By: CBO
Reviewed By: RHP
Drawn By: ANG
W2.0
Sheet 2 of4
ALL ~ 1rn1m1 ~
CHAMBER TRENCH CROSS SECTION -TYP.
r .,, .. c ..
f. 3.5'["'"
LIMIT OF
EXCAVATION
-w:g~·Tuw=w·"""'=·~ -~ =W--"°''''"'llt=t~!",,W· tlf")' ~-~,, -;· [1
i'' UNDISTURBED '
,. SOIL
6' min------..-
SCARIFY SURFACE-----"
GRA VELLESS 'QUICK-4'
CHAMBER (4' x 3')
@ TRENCH SECTION
HOT ro SCALE;
~INFILTRATOR
/ ENO PLATE
12'
---------40'--------...,
33 Four Wheel Drive Road
Carbondale, Colorado 81623
Phone 970.309.5259
carla@allserviceseptic.com
10 CHAMBERS PER TRENCH
---SMALL VALVE COVER
BOX OR IRRIGATION
VAL VE BOX AT GRADE
INFIL TRATOR(R) QUICK4(TM) CUT SHEET
,,JO
.---52 '--++-i
4"PVC
OBERVATION
PIPE ATTACH CAP OR THREADED
CLEANOUT ASSEMBLY -~~;r:::~-~-'1""~,:¥~~.......-~il:::EI~r-"""""'-ZZZilli.~--J ~~·-:-1,~1 fR{::.t.\.Vi.,\ .-~.\~'-~,\-r ... -· -....... ~ . -···
Jm rrm:r\ ~ t~2·J~
COMPACT SOIL:
BASE TO SUPPORT
BOX
USE HOLE SAW TO
4" PVC PIPE CUT TO
FIT
LINES TO ENTER
AND EXIT IN TOP
PORT OF CHAMBER
END PLATE--~
~~6 ;~~TOP OF ~d ¥1 II II"' <'II II II Ill= I
0 CHAMBER DETAILS
Hor ro SCALE;
4" DIA SDR-35 SEWER
LINE (MIN 1% SLOPE TO
TRENCH)
~ GRAVELLESS 'QUICK-4'
/ CHAMBER (4' x 3')
(5) TRENCH PLAN Not 1o scill
Stouffer Residence
700 Linons Ridge Road
Garfield, County
Project Number: C1131
l 4• OJA SDR-35
EFFLUENT PIPE FROM
SEPTIC TANK
\__DISTRIBUTION
BOX, ACCESSIBLE AT
GRADE
PIPES PLACED IN
TOP PORT OF CHAMBER
END PLATES
INSPECTION PORT AT
BEGINNING ANO END OF
EACH TRENCH
Date: 05/08/15
Designed By: CBO
Reviewed By: RHP
Drawn By: ANG
W3.0
Sheet 3 of 4
SLIP-ON PVC CAP------..
DO NOT GLUE
INSULATED COPPER
TRACER WIRE
4" DIASDR-35---......
SEWER LINE
TO TANK
FINISHED GRADE
TO HOUSE
® CLEANOUT DETAIL
NOl TO SCAI£
DESIGN
4-BEDROOM RESIDENCE
(75 GAL/PERSON/DAY x 2 PERSONS/BEDROOM x 3 BEDROOMS)
+ 75 GAL (4TH BEDROOM)= 525 GPO
WASTEWATER FLOW= 525 GPO
TANK:
525 x 48 HOUR RETENTION TIME = MIN. 1250 GALLONS
SOIL TREATMENT AREA (STA):
LONG TERM ACCEPTANCE RATE (LTAR) = 0.8 GAU SQ FT
CALCULATED STA= Q/LTAR = 525 / 0.8 = 656 SF
GRAVITY, TRENCHES= 656 SF X 1.0 = 656 SF
CHAMBERS= 656 SF X 0.7 = 459 SF/ 12 SF I CHAMBER= 38 CHAMBERS
FOUR GRAVELLESS CHAMBER TRENCHES
10 'QUICK 4' CHAMBERS IN EACH TRENCH
TOTAL 40 'QUICK 4' CHAMBERS
ALL ~
~rn~m1 ~~H11 llJ
33 Four Wheel Drive Road
Carbondale, Colorado 81623
Phone 970.309.5259
carla@allserviceseptic.com
SLIP-ON PVC CAP
DO NOT GLUE
SPRINKLER VALVE
BOX AT GRADE
4" DIA SDR-35 ~ I FINISHED GRADE
INSPECTION PIPE <:::::: -i"'Jn:J.!, :;;;:: iii"';Jl!!',.
4" DIA PERFORATED
PIPE INTO STA
MEDIA
1/4" DIA HOLE DRILLED
INTO TWO SIDES OF PIPE
FOR VENTILATION
(BELOW SLIP ON CAP)
0
1
2
3
t1i1-4 w
LL
J:I--5 r
~
l1J
01_5
7
8
9
10
t.-,._. STA FILTER
MEDIA
0 INSPECTION PORT .. ~ET~~~
SOIL PROFILE TEST PIT NO. 1
.,
•'
::
:.:·1 ·'
.·:
·'
•••• 1 ..
:·:"'
.... 1
•'
2'TOPSOIL
LOAMY SAND WITH GRANULAR
STRUCTURE SHAPE, MODERATE
STRUCTURE GRADE, AND FRIABLE
CONSISTENCE
NO GROUNDWATER OR BEDROCK ENCOUNTERED
DURING EXCAVATION
BOX AND COVER BROUGHT TO GRADE l
CONCRETE LID~
FINSHED GRADE
0000
OUTLETS
DISTRIBUTION BOX
_ BAFFLE OR
ANGLED PIPE
TOBE USED
AT INLET
® D-BOX DETAIL
NOT TO SCAL£
SOIL PROFILE TEST PIT NO. 2
:· .-: ....
I•• ••
:· .·:
"r•" ·-..
~ -.·: ...
1 ..... -:--.-: ----I•:·-:.:·
·--.. :•,•:I
2'TOPSOIL
LOAMY SAND WITH GRANULAR
STRUCTURE SHAPE, MODERATE
STRUCTURE GRADE, AND FRIABLE
CONSISTENCE ._ ... ....
:· .... 1
LEGEND
·-·· .... . . . ...
~ ...
•r ••
:~
~. p •
~~
~
NO GROUNDWATER OR BEDROCK ENCOUNTERED
DURING EXCAVATION
~
fl . .
topsoil
loamy
sand
®?OILS LOGS
NOT TO SCAL£
Stouffer Residence
700 Linons Ridge Road
Garfield, County
Project Number: C1131
Date: 05/08/15
Designed By: CBOI W 4. Q
Reviewed By: RH
Drawn By: ANG I Sheet 4 of 4