HomeMy WebLinkAboutEngineer's Design Report 06.20.2015NI L6
June 20, 2015
'•i
33 Four Wheel Drive Rd
Carbondale, CO 91823
970-309.5259
Tim Herreid
herreidcpaavahoo.com
Subsurface Investigation and Onsite Wastewater Treatment System Design
3 -Bedroom Residence
1125 Kings Row Avenue
Garfield County, Colorado
Tim,
Project No. C1155
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 in Missouri Heights,
outside of Carbondale, in an area where OWTSs are necessary.
Legal Description: Section: 27 Township: 7 Range: 87 Subdivision. KINGS ROW SUB. 1ST. Lot: 27
SITE CONDITIONS
A 3 -bedroom, single-family residence presently exists on the property. The property owner is proposing
a new, detached garage. The OWTS was inspected for proper functioning and location as part of the
proposed development. An overview of the existing OWTS is enclosed. With the existing OWTS aging,
a new OWTS is proposed.
The Kings Row Subdivision is served by a community water system.
come within 25 -feet of any existing water line.
The proposed STA location is relatively flat, sloping slightly to the west
are present in the area of the propose STA.
There are no potential future land use changes or bedroom additions planned for the property.
SUBSURFACE
No component of the OWTS will
. Native vegetation and grasses
The subsurface was investigated on June 20, 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.'
The materials encountered in the Test Pit #1 consisted of dark brown, moist, Silty Clay Loam to 3 -feet,
underlain by tan Loamy Sand (caliche) to a maximum depth explored of 6 -feet. Backhoe refusal was
encountered at 6 -feet due to Targe boulders. No bedrock or groundwater was encountered.
The materials encountered in the Test Pit #2 were consistent with those in Test Pit #2.
'Carla Ostberg holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile
Evaluation of Soils Training.
Page 2
A tactile analysis of the soils was taken from Test Pit #1 at 2 -feet below grade. The soil formed a ball
and a ribbon 1 to 2 -inches before breaking. Soil structure shape was blocky, soil structure moderate, and
consistence was friable. This soil horizon is classified as Silty Clay Loam, Soil Type 3.
A tactile analysis of the soils was also taken from Test Pit #1 at 3.5 -feet below grade. The soil formed a
ball, but no ribbon. Soil structure shape was granular (fine grain), structure grade strong, and
consistence was friable. This soil horizon is classified as Loamy Sand.
We are basing the STA sizing on Soil Type 2, as a conservative estimate of the lower, Loamy Sand
horizon. A long term acceptance rate (LTAR) of 0.6 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.
Test Pit #1
3-6 feet
0-3 feet
Pit to 3 -feet
Backfill from pit
Sidewall of pit below 3 feet
Sieved sample of silty clay loam
Sieved sample of loamy sand
Test Pit #2
Silty clay loam
Page 3
Loamy Sand
DESIGN SPECIFICATIONS
The existing septic tank can either be abandoned by collapsing the sidewalls and top of the tank and
remaining void filled with gravel, sand, or compacted soil, or by removing the tank. The existing STA will
be abandoned in place.
Design Calculations:
Average Design Flow = 75 x 2 x 3 Bedrooms = 450 GPD
LTAR = 0.6 GPD/SF
450 GPD 10.6 GPD/SF x 1.0 (gravity trenches) x 0.7 (chambers) = 525 SF
The new OWTS design is based on 3 -bedrooms. An average daily wastewater flow of 450 GPD will be
used. The system installation will include a new 1000 -gallon, two-compartment concrete septic tank with
an effluent filter or screen on the outlet tee of the septic tank.
Effluent will gravity flow from the septic tank to a distribution box, which must be accessible from grade.
Flow equalizers, or similar product, must be used to assure equal distribution to all trenches. The STA
will consist of four trenches, each with 11 'Quick 4' Infiltrator® chambers for a total area of 528 square
feet of infiltrative area. The infiltrative area must be placed below the Silty Clay Loam horizon, but may
not exceed 4 -feet below native grade. If conditions throughout the STA do not allow this depth of
installation, our office must be contacted.
There must be at least 6 -feet of undisturbed soil between each trench. Inspection ports must be placed
at both the beginning and end of each trench. Inspection ports may be cut to grade and placed in a
sprinkler or valve box for access.
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.
Page 4
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
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.
Page 5
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
Nei -La 0S -(-6(A-8
Carla Ostberg, MPH, REHS
Reviewed By:
25 50
Scale: 1" = 50'0"
Lot 26
LEGAL DESCRIPTION
LOT 27 KINDS ROW SUMO-91S•ON. F LINO NO
OABFILb COONry. COLORADO
La! ?6
11-14,0s
' fit . rwor
-9y-te" lF• .ve
0 SITE PLAN
J
3 BEDROOM
RESIDENCE
Lal 29
DRAWINGS MUST BE USED IN
CONJUNCTION WITH DES -AN
LETTER DATED 6/20/1S
ALL
sinic[
33 Four Wheel Drive Road
Carbondale, Colorado 01623
Phone 970.309.5259
W ria®alleerviceseptk.com
Herded Residence
1211 Kings Row
Garfield County, Colorado
Project Number. C1155
Date: 06/20115
Designed By: CBO
Reviewed 0tr RHP
Drawn Br ANG
w1.o
Sheet 1 of 3
J[N
111=18
0' 10' 20'
Scale: V .217-0"
INSPECTION PORT IN
CHAMBER END CAP AT END
OF EACH ROW
'QUICK -4' CHAMBER TRENCH.
4 ROWS OF 11 CHAMBERS = 44
CHAMBERS = 528 SF
SOL PROFILE
TEST PIT NO.2
DESIGN
3 -BEDROOM RESIDENCE
(75 GALIPERSONIDAY x 2 PERSONS/BEDROOM x 3 BEDROOMS)
WASTEWATER FLOW = 450 GALLONS
TANK:
450 x 48 HOUR RETENTION TIME = MIN. 1000 GALLONS
USE 1000 -GALLON, TWO-COMPARTMENT TANK
SOIL TREATMENT AREA (STA):
LONG TERM ACCEPTANCE RATE (LTAR) = 0.6 GAL! SO FT
CALCULATED STA = QILTAR = 450 / 0.6 = 750 SF
GRAVITY, TRENCHES = 750 SF X 1.0 = 750 SF
CHAMBERS = 750 SF X 0.7 = 525 SF 112 SF / CHAMBER = 44 CHAMBERS
FOUR GRAVELLESS CHAMBER TRENCHES
11 'QUICK 4' CHAMBERS IN EACH TRENCH
TOTAL 44 'QUICK 4' CHAMBERS
NEW 1000 -GALLON,
TWO-COMPARTMENT,
CONCRETE SEPTIC TANK
WITH EFFLUENT SCREEN
4" DIA SDR -35 SEWER LINE
WITH DOUBLESWEEP
CLEANOUT
(MIN 2% SLOPE TO TANK)
1.0
.....,,
4' DIA SDR -35 SEWER LINE ! • 1
(MIN 1% SLOPE TO TRENCH) `� SOIL PROFILE ,+
TEST PIT NOV /
DISTRIBUTION BOX WITH
ACCESS AT GRADE
4" DIA SDR -35 SEWER UNE
(MIN 1% SLOPE TO D -BOX)
ABANDON EXISTING
TANK AND STA
a•Q
SINGLE - STORY
FRAME HOUSE
THRESHHOLD
ASSUMED ELEV.
0.00'
EP T
•
• • •
i
VIEWS
0
•
O PROPOSED OWT
ALt
MCI'
33 Four Wheel Drive Road
Carbondale, Colorado 81623
Phone 970.309.5259
Cada®allservIcesep6C-Com
Harried Residence
1211 Kings Row
Garneld County, Colorado
Project Number C1155
Date: 06/20/15
Designed By: CBO
Reviewed By: RHP
Drawn 9r ANG
W2.0
Sheet 2 of 3
INFILTRATOR R OUICK4
CUT SHEET
1
52'
48'
(EFECTIVELENG
mum
a•
r
ma
LINES TO ENTER
AND EXIT IN TOP
PORT OF CHAMBER
END PLATE
INFILTRATOR
END PLATE
SMALL VALVE COVER
4" PVC BOX OR IRRIGATION
OBERVATION VALVE BOX AT GRADE
PIPE ATTACH CAP OR THREADED
CLEANOUT ASSEMBLY
COMPACT SOIL
BASE TO SUPPORT
BOX
USE HOLE SAW TO
CUT THRU TOP OF
END PLATE
0 CHAMBER DETAa S 'ter
INSPECTION PORT AT BEGINNING
AND END OF EACH TRENCH
6' min
44.
11 CHAMBERS PER TRENCH
111
4' PVC PIPE CUT TO
FIT
GRAVELLESS'OUICKd'
CHAMBER (4' x 3')
LIMIT OF
EXCAVATION
SCARIFY SURFACE
STA SECTION
SUP -ON PVC CAP
DO NOT GLUE
4" DIA SDR -35
INSPECTION PIPE
O STA PLAN
4" DIA SDR -35
INSPECTION
PORT
STA FILTER_
MEDIA
ALL 1:1,
SISYICI
3' MIN TO
CALICHE HORIZON
GRAVELLESS'OUICK.c
CHAMBER (4' x 3')
SPRINKLER VALVE
BOX AT GRADE
FINISHED GRADE
114" DIA HOLE DRILLED
INTO TWO SIDES OF PIPE
FOR VENTILATION
(BELOW SLIP ON CAP)
OINSPECTION PORT DETAL
pr r6 sod
33 Four Wheel Drive Road
Carbondale, Colorado 61623
Phone 870.309.5259
cartaaallservkeaept1C.cdn
1.61 T8 Y.xI
4" DIA SDR 35
EFFLUENT PIPE FROM
SEPTIC TANK
DISTRIBUTION
BOX ACCESSIBLE AT
GRADE
PIPES PLACED IN
TOP PORT OF
CHAMBER END
PLATES
SLIP-ON PVC CAP—,.
DO NOT GLUE
INSULATED COPPER
TRACER WIRE - FINISHED GRADE
4" DIA SDR -35
SEWER LINE
TO TANK
TO HOUSE
CLEANOUT DETAIL
l4 • 1.01 10 YUL
BOX AND COVER BROUGHT TO GRADE
CONCRETE LID
FINSHED GRADE
Harried Residence
1211 Kings Raw
Garfield County, Colorado
Project Number. C1155
0000li
OUTLETS
, BAFFLE OR
DISTRIBUTION BOX ANGLED PIPE
TO BE USED
AT INLET
D–BOX DETAIL
66116Vd
Date: 06120/15
Designed By. CBO
Reviewed By: RHP
Drawn By ANG
W3.0
Sheet 3 of 3
Item #
1000T-2CP
Top
View
Section
View
1000 Gallon Top Seam
Two Compartment
111"
*Meets ASTM C-1227 spec
including C-1644-06 for resilient
connectors
• 6000 psi concrete
• Delivered complete with internal piping
• PVC, poly or concrete risers available
• Option of pump or siphon installed
106"
Digging Specs Invert
11' Long x 7' Wide Inlet Outlet Length Width Height
56. below Inlet invert 58' 53' 111' 60' 68'
Dimensions
Net Capacity
Inlet Side Outlet Side Total
687 gallons 323 gallons 1,010 gallons
Lid
2,820 !be
Net Weight
Tank Total
9.380 Ibs 12,000 Is
Water &(719) 3954764 29005 Co` Rd' 317
Wastewater P.O. B ic925
• Systems Fax: {719) 395-3727 Buena Vista, C081211
Q VALLEY • Products website: www.valieypnecastoom
❑ PRECAST, Inc. •service Email: finntdesk@valleyprecastoom
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 Targe solids from leaving
the tank, dramatically improving wastewater quality and extending the life
of residential drainfields.
4 -in. (100 -min) Biotube Effluent Filter
4 -in. (100 -nim.' Biotube Jr.
(4 -in. Biotube cartridge avail-
able separately as Insert Filter)
8 -in. f200 -min,.;
Base Inlet Filter
4 -in. (100 -rani)
Insert Filter
Orenco superior effluent filters resist clogging better than all other brands. Ourstan-
dard, frill -sized 4 -in. (100 -nim) Biotube .Effluent Filter provides maximum long-term
protection in a complete package, with housing. Our 4 -in. 100 -min) Biotube Jr., at
half the size of our standard model, has more filtering capacity than the full-sizedfilters
sold by other manufacturers. For tanks with existing outlet tees, the Biotube Insert Filter
is ideal Andfar low profile tanks, there's the Base Inlet Filter.
• covered by pment numbers 5.491,635 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
Rev. 3.4 ®11110
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
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.
Orenco Systems"
Incorporated
Changing the Way the
World Don Wastewarera
www.orenco.eom
Nomenclatures
4 -in. Biotube Filter (standard)
FT000400-000
I Options:
Blank = no options
M = flow modulation plate insla led
A = float bracket attached
Cartridge height. 28" and 36" are standard
Housing height: 36" and 44" are standard
Filler diameter (inches)
W = fitsType 3034 outlet pipe
S = fits Schedule 40 outtet pipe
Blank = 118" filtration
P = 1116" titration
Biotube effluent filler series
8 -in. Biotube Filter (base inlet model)
FT008 22-14 B
Ophons:
A = float bracket
FS = 2" outlet orifice
FSO = 2" outlet orifice and overflow p ate'
Base inlet model
Cartridge height: 14" standard
Housing height: 22" standard
Filte diameter (inches)
08 = 8"
Blank = 118" filtration
P = 1116" filtration
Biotube effluent filler series
'Also available with coupling and sleeve as a lel": FT•OVERFLOWKfT
4 -in. Biotube Jr (includes cartridge and housing)
FTJ 0004 18
1 Options
Blank = no options
M = flow modulation plate installed
A = float bracket attached
Cartridge height (inches)
Fite diameter (inches)
W li s Type 3034 outlet tee
5 = fi s Schedule 40 outlet tee
Blank = 118" filtration
P = 1116" filtration
Junior series
Biotube effluent filter series
4 -in. Biotube Filter Insert (cartridge only)
FT 004 18 -0-
1 For customized options (e g NC
indicates North Carolina regions)
W = fits Type 3034 outlet tee
S = fits Schedule 40 outlet tee
Cartridge height (inches)
Filter diameter (inches)
Blank = 118' filtration
P = 1116" filtration
Insert
Biotube effluent filler series
4 -in. Biotube 4 -in. Biotu
Effluent Filter
Extendible PVC handle
Stainless steel set screws'
Top seal plate
Air Vents
Biotubeo filter cartridge
)000'
„Solid base' ,.
.t— Riser
ti wall
Filter housing
Tank wall
Distributed By:
Item #
DBox 8C
Concrete Distribution Box
(1 inlet, 7 outlets) & Riser
Top View
End View
Riser Section
28" 15"
ock Down Baffle
12"
Side View
12"
End View
Section View
y
28"
25"
rl
14"
5"'
7"
WE.
28"
r
7
Lid View
• 6000 PSI Concrete
• 7 Outlet equal flow
• Slide -in Baffle
• 4" Pipe penetration ports
• Connectors cast into the box
• 1? Riser available
Weight:
D -Box with Baffle - 200 lbs
D -Box Lid - 75 lbs
D -Box Riser -140 lbs
Water & (719) 3954764 X005 Co. Rd 317
Wastewater P.O Bcoc925
F a • Systems Fax: (719) 395'3727 Buena Vista, CO 81291
O VALLEY • Products website: www.valleyprecastcom
D PRECAST,Inc. • Serviced; trvntdesk@valleyprecastoom
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May 15, 2015
CBO Inc.
33 Four Wheel Drive Road
Carbondale, CO 81623
cell) 970-309-5259 office) 970-704-0484
caria.ostbero( omail.com
Brad Zeigel
A4 Architects, LLC
242 North Seventh Street
Carbondale, CO 81623
Onsite Wastewater Treatment System (OWTS) Overview
1211 Kings Road
Garfield County, Colorado
Mr. Zeigel,
As requested, CBO Inc. performed site visit to 1211 Kings Row, Carbondale, Colorado on May 14, 2015.
A shed will be constructed on the property and there is a desire to locate components of the OWTS to
assure the shed will not be cover any of the existing OWTS components. Records were requested from
Garfield County Community Development Department and none were found.
Observations on the property leads us to believe the OWTS consists of concrete Jet® Aeration septic
tank followed by a mounded soil treatment area (STA) located to the south and west of the existing
residence. We speculate the STA is pipe and gravel. The aerator in the Jet® system has been removed.
Attached is a schematic of a typical Jet® tank for your reference.
Accumulation of scum in the first compartment of the Jet® tank warrants pumping. There was no access
to the third compartment of the jet tank at the time of our visit.
In order to verify the exact location of the STA, we recommend running a camera through the outlet line
of the septic tank to identify the path of the sewer line and where the STA begins. Three inspection ports,
all broken, were located in the area of the STA, which allows us to identify an approximate footprint.
There was no evidence of failure or surface saturation at the time of our visit. Recommendations for
location and maintenance of the existing OWTS components are as follows:
Recommendations:
• Uncover outlet side of Jet® tank;
• Run a camera through outlet line of septic tank to verify exact sewer line path and depth AND
identify where sewer line enters STA. Sewer line may require jetting if too dirty. Material and
condition of the line should be accessed during this process. If cast iron is found, we recommend
replacement.
• Run a camera through the inlet line of septic tank toward the house. Sewer line may require
jetting if too dirty. Material and condition of the line should be accessed during this process. If
cast iron is found, we recommend replacement.
• Pump septic tank.
• Cap inspection ports in STA.
Please report findings to our office. Findings may result in additional recommendations. Adjusting the
location of the shed or relocation of OWTS components may be necessary.
Please call with questions.
Sincerely,
(!ah (a D8
Carla Ostberg, MPH, RENS
NAWT Certified Inspector
Certification # 110441TC Exp. 2016
Inlet side of septic tank (thick accumulation of scum) Aeration chamber. Aerator not present.
Electrical
line
3 inspection ports observed / all broken / recommend capping
Gog1e earth feet 300
meters 100