HomeMy WebLinkAboutEngineer's Design Plan129 CAINS LNruE
CARBONDALE,CO A1623
970.309.5259
cnn le, osre Enc@c u4l I-. cqvt
r:il':lyl. I (" ( r{ ri\t t( ! I.'l.ll\ (i
December 1,2023 Project No. C171 1
Jon Duffy
duffvion0T@outlook.com
Subsurface lnvestigation and Onsite Wastewater Treatment System Design
4-Bedroom Residence + 1-Bedroom Accessory Dwelling Unit (ADU)
1360 CR 331
Garfield County, Colorado
Jon,
CBO lnc. performed a subsurface investigation and completed an onsite wastewater treatment system
(OWTS) design for the subject residence. The 35.013-acre property is located outside of Silt, in an area
where OWTSI and wells are necessary. Original design documents dated March 15,2023 reflected
sizing for only a 4-bedroom residence. A 1-bedroom ADU is also contemplated. Those original design
documents should be discarded and replaced with these, dated December 1,2023.
Legal Description: Section: 15 Township: 6 Range: 92 ALL THAT PART OF NWSW LYING ELY OF CO
RD 331 35.013 ACRES
Parcel lD: 2179-153-00-489
SITE CONDITIONS
The property is currently undeveloped. A 4-bedroom residence, a detached garage with a 1-bedroom
ADU, and shop with no plumbing are proposed.
The residence and ADU will be served potable water by a private well on the property. The well is
located on the western portion of the property, south of the existing gravely driveway. The well is located
greater than SO-feet from the proposed septic tanks and greater than 1OO-feet from the proposed soil
treatment area (STA).
Dry Hollow Creek runs along the western portion of the property. No OWTS component will come within
'1OO-feet of Dry Hollow Creek.
The proposed soil treatment area (STA) location has an approximate ten percent slope to the south. The
proposed area is sparsely vegetated with sage and native grasses.
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.
SUBSURFACE
The subsurface was investigated on April 12,2022 by digging two soil profile test pit excavations (Test Pits)
and then again on November 16,2022 after the location of the proposed residence was changed, A visual
Page2
and tactile soil analysis was completed by Carla Ostberg at the time of excavations.l
The materials encountered in Test pit #1 consisted of light brown clay loam topsoil to 2.O-feet, underlain by
gray weathered claystone to a maximum depth explored of 9.O-feet. No bedrock or groundwater was
encountered.
The materials encountered in Test pit #2 consisted of light brown clay loam topsoil to 4.O-feet, underlain by
gray weathered claystone to a maximum depth explored of 9.O-feet. No bedrock or groundwater was
encountered.
The materials encountered in Test Pit #3 consisted of medium brown clay loam topsoil to 1'O-foot,
underlain by gray weathered claystone to a maximum depth explored of 8.O-feet. No bedrock or
groundwater was encountered.
The materials encountered in Test Pit #4 consisted of medium brown clay loam topsoil to 6-inches,
underlain by gray weathered claystone to a maximum depth explored of 8.0-feet. No bedrock or
groundwater was encountered.
A sample of the soil was taken from Test Pit #1 at 3-feet below grade. The soil formed a ball and a
ribbon 1 to 2-inches in length before breaking. Soil structure shape was blocky and consistence was
extremely firm.
A sample of the soil was taken from Test Pit#4 al2-feet below grade. The soil formed a ball and a
ribbon between 1 and 2-inches in length before breaking. Soil structure shape was blocky and
consistence was extremelY firm.
These soits were difficult to classify as they were different than those we typically encounter' We did
additional research of the soils in the area through USGS Web Soil Survey. The report is enclosed. The
area of the proposed STA is identified by map unit symbol 67. The map unit name is Torriorthents-Rock
outcrop complex, steep. When searching for the Torriorthents-Rock outcrop complex, the Paintrocks
series was referenced. The Paintrock series consists of very shallow, excessively drained soils formed in
granitic residuum. The paintrocks soils are on mountains, hills, and pediments. Slope ranges from 2 to 50
[ercent. The mean annual precipitation is about 5 inches and the mean annual air temperature is about
64 degrees F.
We have also enclosed CTL Thompson's report dated August25,2022. They have described the
subsoils as weathered claystone.
With this information, we are classifying the soils as Soil Type 3, Clay Loam. A long'term acceptance
rate of 0.35 gallons/square foot will be used to design the STA.
r Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile
Evaluation of Soils Training.
Page 3
411212022
Test Pit #1
Test Pit #1
Page 4
i
i
!r.
Backfill Test Pit #2
Page 5
t:;
Sieved sample
1111612022
View of new proposed STA location north of driveway
,,,.,. _*Ti.
View to the southeast toward house location excavation / Test Pit #3
Page 6
Sieved sample and peds
PageT
i
et
.*;,
qhy-1Hfl#-."1.{ir+ -... .,-r*.
Page 8
Test Pit #4
DESIGN SPECIFICATIONS
Desiqn Calculations:
@=75GPDx2people/bedroomx3Bedrooms+75GPD(4thBedroom)=525GPD+
150 GPD (1-Bedroom ADU)= 675 GPD
LTAR = 0.35 GPD/SF
675 GPD / 0.35 GPD/SF = 1928.5 SF
1928.5 SF x 0.8 (pressure dosed trenches)x 0.7 (chambers)= 1080 SF
The OWTS design is based on 4-bedrooms in the residence and 1-bedroom in the ADU, An average
daily wastewater flow of 675 GPD will be used.
For the purposes of this OWTS design, Benchmark Elevation at grade 5525,66'tras been established as
100'. The Finished Floor (FF) of the-proposed residence will be 5526.69'. The Finished Floor of the
detached garage / ADU *itt n" approximately 5538'. CBo lnc. should be notified of any discrepancies or
problems ivitfr lraOe elevations of proposed components during installation of the OWTS.
*Elevations are based uPon stand
installation due to site conditions.
ard OWTS installation Practices
Minimum grade refers to PiPing
Page9
Component elevations may change during
between components.
The 4-inch SDR-35 sewer lines exiting the residences must have a double-sweep clean outs and a
minimum 2o/o grade to the septic tank. Any area subject to traffic should be minimum Schedule 40
strength sewei pipe. There must be a clean out a minimum of every 10O-feet of length. The sewer line
from fhe ADU should tie into the sewer line serving the residence before the septic tank with a vvye fitting'
The system installation will include a 1S00-gallon, two-compartment septic tank with an Orenco@ Biotube
fffluent Filter. Effluent will gravity flow to a Soo-gallon, single-compartment pump chamber with an Orenco@
Biotube Pump Vault and an Orenco@ PF3005 pump. We have specified Valley Precast concrete septic
tanks, but any state-approved concrete or poly septic tanks may be used. The floats should be set to dose
approximately 7l gallans each pump cycle, allowing approximately 8 gallons of drain back....The
cbntrol panel for the pump must be located within line of sight of the septic tank. An electrician will
responsible for wiring the pumping system and the installer responsible for connecting the plumbing in the
pumping system, This office should be contacted for testing of the system.
Pum Table
Effluent will be pumped through a 1.S-inch diameter pump line from the pump chamber to an Orenco@
automatic distributing valve (ADV), model 6605. This pump line must have a minimum 1o/o grade for proper
drain back into the tank after each pump cycle. The pump line will cross the driveway. We recommend
installing a minimum Schedule 40 on stronger conduit for the pump line. The ADV must be placed at a high
point in the system in an insulated riser with access from grade. Screened rock must be placed below the
AOV to suppbrt the ADV and to assure the clear pipes exiting the ADV remain visible for future inspection
and maintenance.
owTs c Minimum Elevation
Primary Tank lnlet lnvert (from residence)
Pump Chamber lnlet lnvert
Approximate horizontal distance 40'l min. 2%fall I
min. 10" fall
Approximate horizontal distance 43' lmin' 1%fall I
min. 5.375 fall
Automatic Distributing Valve (from pump chamber)Approximate horizontal distance 73' I min. 1o/o rise I
min.9.125" rise
lnfiltrative Surface Approximate horizontal distance 35' to furthest
trench I min.1o/o fall to STA / min. 4.375" fall
Dose Range Max = 176.75 gal. (675 GPD x
25% + 8 gal drain back)
Min. 52 gal. (11 gal x 4) + 8 gal
drain back
Dose Setting 77 gallons/dose 8 gallons drain back (73' I 1.5"
diameter oump line)
Float Separation 500 gallon single-compartment
Valley Precast concrete sePtic
tank
7" onloff float separation
(10.1 gal/inch)
Pump Criteria 17.1 gallons per minute (GPM)20.5 feet total dynamic head
(TDH)
Page l0
Effluent will be pressure dosed through 1.S-inch diameter pipes to five gravelless chamber trenches,
each with 1B ,Quick 4' plus standard lnfiltrator@ chambers, for a total of 90 chambers and 1080 square
feet of infiltrative area. There must be at least 4-feet of undisturbed soil between each trench.
Effluent will be pressure dosed to 1.S-inch diameter laterals, which must be hung with zip ties from the
underside of the chambers. Laterals will have 5132-inch diameter orifices facing up, with the exception of
the first and last orifices facing down for drainage. Orenco@ Orifice Shields may be placed under e_a_ch
Jownward-facing orifice. ThJorifices must be placeO 3-feet on center. Each lateral must end in a 90
degree ell facing- up with a ball valve for flushing. Valves may be placed in a valve box, accessible from
grJd", for acceis. lnspection ports must be placed at the beginning and end of each trench' Ports may
be cut to grade and covered with a valve box for access'
COMPONENT SPECIFICATIONS
The component manufacturers are typical of applications used by contracto_rs anq engineers in this area.
GBO lnc. 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.
Construction must be according to the jurisdiction's adopted On-Site Wastewater Treatment System
Regulations, the OWTS Permit, and this design.
PERMIT APPLICATION INSTRUCTIONS
An OWTS Permit Application must be submitted to Garfield County Environmental Health Department.
COMPONENT MANUFACTURER MODEL NO.
-_EOMMENTS
Septic Tank Valley Precast tem # 1500T-2CP 2-com partment concrete
seotic tank
Effluent Filter Orenco@ diameter, full size
Iter
Pump Chamber Valley Precast tem # 500-1CP-HH
Pump Orenco@ PF300511 %HP
120 Volt
Biotube ProPak PumP
Packaqe
Orenco@ BPP3ODD an
demand dose
Tank Risers and Lids Orenco@ sers an
(24" diameter)
ADV Orenco@ v6605A n an
ADV Riser and Lid Orenco@ Double-walled PVC Risers
and Lids (30" diameter)
Orifice Shields Orenco@ os150 1.5 inch diameter (10 total)
Flushing Assembly Orenco@ 1.5" diameter (2) 45" or 90" long sweeP onlY
(5 totat)
Chambers lnfiltrator@ Plus Standard 90 'Quick 4' chambers
m
Packet-Dec..-201 9.pdf. lf
Application, it should be s
All questions regarding permit submission can be directed to Garfield County Environmental Health
Department, 970-945-661 4 x81 50.
the OWTS Permit Application will be submitted with a Building Permit
ubmitted directly to Garfield County Building Department.
Page l1
INSTALLATION CONTRACTOR
CBo lnc. 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
instjtation. Any additional conditions in th'[ 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 oiher plumbing, as applicable, must also be observed. CBo lnc. should be notified 48 hours
in advance to observe the installation.
ln 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
pafuet. photogiaphs ofthe installation and final cover are also requested to supplement our installation
documentation.
REVEGETATION REQUI REM ENTS
An adequate layer of good quality topsoil capable of supporting revegetation shall be placed over the entire
disturbed area of tnjOwf'S inltallation. A mixture of native grass seed that has good soil stabjlizing
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. Untii vegetation is reestablished, erosion bnd 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'
lf an effluent filter or screen has been installed in the OWTS, we recommend this filter or screen be cleaned
annually, or as needed. lf 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 drainJshould not discharge into the OWTS. The OWTS is engineered for domestic waste
only.
Page 12
ADDITIONAL CONSTRUCTION NOTES
lf design includes a pump, weep holes must be installed to allow pump lines to drain to minimize risk of
freezirig. The pump shail'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. lf soil conditions encountered are different from conditions
describeJ in report, CBO lnc. 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
co-ntractor 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
K-CROAI/(
Sincerely,
l1(), Bo.r r4o
lfar'fr, C0,9r
CBO lnc,
)7 o, ! io,a iI r f &acl uI ln. crort&urot rdoct&.cottr
Reviewed By:
&r'\[a }sthr-].E
Carla Ostberg, MPH, REHS
Kaehayla R. Ctouk, P.E.
Colorado Licerrse No. 61440
Pump Selection for a Pressurized System - Single Family Residence Project
Duffy
Parameters 300
Discharge Assembly Size
Transport Length Before Valve
Transport Pipe Class
Transport Line Size
Distributing Valve Model
Transport Length After Valve
Transport Pipe Class
Transport Pipe Size
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
Calculations
1.25
73
40
1.50
6605
35
40
1.50
5
0
40
1.50
5
72
40
'1.50
5132
5
None
0
feet
feet
inches
inches
inches
inches
feet
inches
inches
feet
feet
inches
feet
250
150
100
feet
feet
200ool!
IoF
d(0oE
.9
Eo
o
(U
e
Minimum Flow Rate per Orifice
Number of Orifices per Zone
Total Flow Rate per Zone
Number of Laterals per Zone
% Flow. Differential 1 suLast Orifice
Transport Velocity Before Valve
Transport Velocity After Valve
Frictional Head Losses
0.68
25
17 .1
I
4.4
2.7
2.7
gpm
gpm
%
fps
fps
50
Loss through Discharge
Loss in Transport Before Valve
Loss through Valve
Loss in Transport after Valve
Loss in Manifold
Loss in Laterals
Loss through Flowmeter
'Add-on' Friction Losses
Pipe Volumes
2.0
1.4
(o
0.6
0.0
0.5
0.0
0.0
feet
feet
feet
feet
feet
feet
feet
feet
0 15 20 25
Net Discharge (Spm)
30 35 4005 10
PumpData d
Vol of Transport Line Before Valve
Vol of Transport Line After Valve
Vol of Manifold
Vol of Laterals per Zone
Total Vol Before Valve
Total Vol After Valve
7.7
3.7
0.0
7.6
7.7
11 .3
gals
gals
gals
gals
gals
gals
PF3005 High Head Effluent PumP
30 GPM, 1/2HP
1151230V 1A 60H2,200V 3A 60Hz
PF3007 High Head Effluent PumP
30 GPM, 3/4HP
230V 1g 60H2,2001460V 3A 60Hz
PF3010 High Head Effluent PumP
30 GPM, ,IHP
230V 1A 60H2,2001460V 30 60Hz
PF3015 High Head Effluent PumP
30 GPM, 1-1l2HP
230V 1A 60Hz.,20012301460V 3@ 60Hz
remsnts
17 .1
20.5
gpm
feet
5Y$1[[4$M
t\
\
System Curve:-
Pump Curve: *
Pump Optimal Range:-
a1
Operating Poini: *
o
Design Point:
a
N
LINE
SCALE: 1 = 50'=0"
SHOP
4.BEDROOM
RESIDENCE
FF = 5526.69'
rP2
TP1
PUMP
CHAMBER
TP3
- TANK
SEPTIC
STA
TP
':r'i'-r:
Y{2.0
PROPOSED DRIVEWAY__tT-
Duffy Residence
1360 CR 331
Garfield County, Colorado
Project Numben C'1711
lDate: 03/15/2023
lRevised:1211/2023
lDesigned by: CBo
I Reviewed by: KRC
lDrawn by: DD
i':
DRAW|NGS
LETTER DATED 1ZO1I2O23
WITH DESIGN
BE USED IN
-. t. il'.1
l:
PROPOSED 1-BEDROOM
AND GARAGE
FF = APPROX.5538'
THE LOCATION OF PROPOSED IMPROVEMENTS SHOWN ARE
NOT THE RESULT OF A PROPERTY SURVEY. THE LOCATIONS
ARE APPROXIMATE. IT IS THE HOMEOWNERS'DUTYTO
ENSURE ALL CONSTRUCTION AND IMPROVEMENT LOCATIONS
ARE ACCURATE. PROPERTY LINES AND SETBACK DISTANCES
SHOULD BE CONFIRMED PRIOR TO EXCAVATION. SCALED
FOR PRINTING ON 1 1' X 17' PAPER-
/ASITE PLAN
i'-S{
CALL811 FOR
UTILIry LOCATES
w1 .0
CBO lnc.
129 Cains Lane
Carbondale, Colorado 8 1623
Phone 970.309.5259
€rla.ostberg@gmail-6m Sheet 1 0F 4
CBO lnc.
129 Cains Lane
Carbondale, Colorado 81623
Phone 970.309.5259
€rla.ostberg@9mail.@m
F-15.5,----------|*-
l**
1.j]r
TP3
1.5" DIA SCH-40 DISTRIBUTION
LINES TO EACH TRENCH
FLUSHING VALVE AT
END OF EACH LATEML
5 TRENCHES EACH WITH 18 'QUICK 4' CHAMBERS = 90
CHAMBERS = 1080 SF
1.5" DIA SCH-40 PVC SUSPENDED LATERALS WITH 5/32"
DIA ORIFICES 3' O.C. FACING UP. FIRST AND LAST
ORIFICES FACING DOWN FOR DRAINAGE COVERED WITH
ORIFICE SHIELDS
^t\- {^'l *\11--
\:J
,J)
ADV MODEL 6605 AT HIGH POINT,
ACCESSIBLE AT GRADE
4' DIA SDR-35 INSPECTION PORT
AT BEGINNING AND END OF EACH
TRENCH
SCALE: 1" = 20-0"
N
ill1.
1r'
v"'(:)
)
n\
,":.,)
q-*]
",2{ '^. -i
50O-GALLON
SINGLE.COMPARTMENT PUMP
CHAMBERWITH AN
ORENCO PUMP PACKAGE,
RISERS AND LIDS TO GRADE
1 sOO-GALLON 2.COMPARTMENT
SEPTIC TANK WITH AN
EFFLUENT FILTER ON THE OUTLET
TEE, RISERS AND LIDS TO GRADE
PROPOSED
4.BEDROOM
RESIDENCE
FF = 5526-69'
PROPOSED
SHOP
./ \ ./'/\,/
Duffy Residence
1 360 CR 331
Garfield County, Colorado
PrcjectNumber: C1711
lo^t, ostlstzozg
lRevised'.1z1t2o29
lDesigned by: cBo
lReviewed by: KRC
lDrawn by: DD
\
TP+
4" DIA SDR-35 SEWER PIPE WITH CLEANOUT
MIN 2% FALL TO TANK
1.5" DIA SCH-40 PUMP LINE WITH MIN.
SCHED4O CONDUIT PIPE UNDER THE
DRIVEWAY.
(MIN 1% DRAIN BACKTO TANK)
i\\\.\\\
4" DIA SDR-35 SEWER PIPE
(MlN 1% FALL) TO TIE INTO SEWER L|NE
SERVING PROPOSED RESIDENCE WITH
WYE FITTING (CLEAN OUTS MIN. EVERY
1 00)
4' DIA SDR-35 SEWER PIPE WITH CLEANOUT --
MIN 1% FALL TO PUMP CHAMBER
PROPOSED
1-BEDROOIVI ADU
AND GARAGE
FF = APPROX.5538'
w2.o
Sheet 2 0F 4
'outcK4'
END PUTE
DIA SDR.35 INSPEC]ION
CilMBER (4' x 3)1.5" DIA SCH40
DISTRIBUTION LINE TO
EACH TRENCH
1-5" DtA SDR-35
EFFLUENT PIPE FRO[,,|
DIASDR-35
INSPECTION
PORT
30" DIAMETER PVC
RISER
FROM
PUMPING
CHAMBERTANK
ADV Wfr ACCES AT
GMDE
PUCED IN TOP PORT
OF CHAMBER END PLATES
DISRIBUTION LINES
SOIL
LIMIT
EXCAVATION
24'MtN-
3'MtN.
8" MtN.
/ATRENCH DETAIL\9r--aF@
L j"
TO OTHER TRENCH (5
TOTAL)
SUSPEND LATERALS WTH
ZP-TIES TO UNDERSIDE
OF CMMBERS
GRAVELLESS 'QUICK-4'
CHAIjBER (4'x 3')
SCARIry SURFACE
/A CHAMBER 1RENCH SECTION\gr----lrlttr
DISTRIBU'IlNG
VALVE ASSEMBLY
DtA Sct-t4o
PVC INLETAND
OUTLETS
A AUTOMATIC DIS1RIBUIING\9r-VAL\E DETAILEND EACH LATEML IN A9O'LONG
SWEEPING ELL FACING UP WTH ABALL
VALVE IN A VALVE BOX ACCESSIBLE AT
GMDE
1.5' DTA SCH4O PVC SUSPENDED LATERAL
WITH 5/32" DIA ORIFICES AT 3'O.C. FACING
UP. FIRST AND LASTORIFICES FACE DOWN
WITH N ORIFICE SHIELD FOR DRAINAGE
A CHAMBER IRENCH PLAN\r,-
SffiIL VALVE COWR
BOX OR IRRIGATION
VALVE BOX AT GMDE
PORTAT BEGINNING AND
END OF EACH TRENCH
/AINSPECION PORT DETAIL\9|----Erntr
A,v
/^.ror. r.r.",*n
xf^lEF3?=,x$:*DIA VALVE BOX
WTH SECURED LID
PVC SLIP X MALE
FINISHED GRADE
CAP OR THREADEO
CLEANOUTASSilBLY
PVC PIPE CS TO
FIT
4' DIA SDR-35 SEWER LINE
(MrN 2% SLOPE TO TANK)
SCREENED
/i FLUSHING VALVE DEIAIL\y
PIPE THREAD
ADAPTERWCAP
1.5" DIA BALL
VALVE
'1.5' DIA SCH-40 PVC
LONG SWEEP 90'ELBOW
CHAMBER END CAP
1.5" DtA SCH-40 PVC
SUSPENDED TATERAL
w3.0
COIVPACT
BASE TO SUPPORT
BOX
USE HOLE SAWTO
CUT THRU TOP OF
END PLA
OR SAND FOR
BEDDING
Duffy Residence
1360 CR 331
Garfield County, Colorado
Project Number: C1711
baje: O3|15DO23
hevised:12112023
lDesigned by: CBo
lReviewed by: KRC
lDrawn
bV: DD
CBO lnc.
129 Cains Lane
Carbondale, ColoEdo 81623
Phone 970.309.5259
€rla.ostberg@gmail.@m Sheet 3 0F 4
DESIGN
4€EDROOM RESIDENCE + .I-BEDROOM ADU
75 cPD x 2 PERSONSiBEDROOM x 4 BEDROOMS + 75 GPD (4th BEDROOM) +
150 GPD (ADU) = 675
WASTEWATER FLOW = 67s GPD
TANK:
MIN. 1550 GALLONS
USE 1sOO.GALLON, TWO.COMPARTMENT SEPTIC TANK FOLLOWED BY A
sOO-GALLON SINGLE-COMPARTMENT PUMP CHAMBER WITH ORENCO
PUMPING SYSTEM
SOIL TREATMENT AREA (STA):
LONG TERM ACCEPTANCE RATE (LTAR) = 0.3s GAU SF
CALCULATED STA = OATAR = 675/ 0.35 = 1928.5 SF
PRESSURE-DOSED, TRENCHES = 1928.s SF X 0.8 = 1543 SF
CHAMBERS = 154:i SF X 0.7 = 1080 SF i 12 SF / CHAMBER = 90 CHAMBERS
FIVE GRAVELLESS CHAMBER TRENCHES
18 'QUICK 4 CHAMBERS IN EACH TRENCH
TOTAL 90'OUICK4' CHAMBERS
SOIL PROFILE TEST PIT NO. 1
LIGHT BROWN CLAY LOAM
GRAY WEATHERED CLAYSTONE
SLIP.ON PVC
DO NOT GLUE
INSULATED
TMCERWIRE FINISHED GRADE
4'DIA
SEWER LINE
TO TANK HOUSE
//iCLEAN OUT DETAIL\rt------ft,E
SOIL PROFILE TEST PIT NO. 2
LIGHT BROWN CLAY LOAM
GRAY WEATHERED CLAYSTONF
/isolls LoG\:/
STATO DRY HOLLOW CREEK 50'Mg
STA TO WELL 100'470'
STA TO HOUSE 20'105'
PUMP CHAMBERTO DRY HOLLOWCREEK 50'527
PUMP CHAMBER TO WELL 50'525',
HOUSE TO SEPTIC TANK 5',33'
OWTS COMPONENTS AND
PHYSICAL FEATURES
MINIMUM REQUIRED
SETBACK
APPROXIMATE PROPOSED
SETBACK
'ASEIBACK CHART\v
SOIL PROFILE TEST PIT NO. 4 LEGEND
V a"v
loam
Fl weattrerea
daystone2
SOIL PROFILE TEST PIT NO. 3
MEDIUM BROWN CLAY LOAM
GRAY WEATHERED CLAYSTONE
MEDIUM BROWN CLAY LOAM
GRAY WEATHERED CLAYSTONE
4
b
7
8
I
'10 NO GROUNDWATER OR BEDROCK ENCOUNTERED
DURING EXCAVATION
CBO Inc.
129 Cains Lane
Carbondale, ColoEdo 81623
Phone 970-309-5259
carla.ostberg@gmail.mm
Duffy Residence
1360 CR 331
Garfield County, Colorado
ProjeciNumber: C1711
lDa'.: ogt1st2o23
lRevised:1211/2023
I Designed by: CBo
I Reviewed by: KRC
lDrawn by: DD
w4.0
Sheet 4 0F 4
$tf -;
.a:
I
=
6
3 Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties
2719
Web Soil Survey
National Cooperative Soil Survey
39" 31'3a" N 39. 31'3'N
z71W
Natural Resources
Conservation Service
271110 27118n t1n z71g
Map Scale: 1:3,290 if prinbd on A landscape (11" x 8.5) shed.
M€ters0 45 90 180 270
Feet0 150 300 600 9@
Map prot:edion: Web Mqcator Comer oodinates: WGS84 Edge tics: UTM Zone 13N WGSB4
=
6
=
b
LN
A
USDA
-
3118t2023
Page 1 of 3
39. 31'23" N
2714@ 2715?0 271ffi 271670
390 3f 23' N
Natural Resources
Conservation Service
Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties
Web Soil Survey
National Cooperative Soil Survey
3l'1812023
Page 2 of 3
MAP LEGEND MAP INFORMATION
The soil surveys that comprise your AOI were mapped at
1:24,O00.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can Gluse
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
SurveyArea Data: Version 15, Sep 6,2022
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Aug 25, 2021-Sep
5,2021
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Area of lnterest (AOl)
=
Area of lnterest (AOl)
Soils
n Soil Map Unit Polygons
#' Soil Map Unit Lines
E Soil Map Unit Points
Special Point Features
f€t Blowout
El Bonow Pit
H Clay Spot
O Closed Depression
X Gravel Pit
& Gravelly Spot
S Landfill
& Lava Flow
& Marsh or swamP
fr. Mine or Quarry
S Miscellaneous Water
& Perennial Water
tg Rock Outcrop
+ Saline Spot
i: Sandy spot
€' Severely Eroded Spot
S Sinkhole
b Slide or Slip
@ Sodic Spot
El Spoil Area
& StonySpot
x$ VeryStonySpot
W WetSpot
,5 Other
t. Special Line Features
Water Features
Streams and Canals
Transportation
1-i.1 Rails
# lnterstate Highways
Ad US Routes
;:"";j; Major Roads
:i /. Local Roads
Background
I Aerial Photography
USDA
-
Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties
Map Unit Legend
Percenl of AOIAcresln AOIMap Unit Symbol
27.7o/o13.9Arvada loam, 1 to 6 Percent
slopes
J
13.7o/o6.9Torriorthents-Camborthids-
Rock outcrop comPlex,
steep
bb
58.6%29.5Torriorthents-Rock outcroP
complex, steep
67
100.0%50.3Totals for Area of lnterest
USDA:Natural Resources
Gonservation Service
Web Soil Survey
National Cooperative Soil SurveY
3t1812023
Page 3 of 3