HomeMy WebLinkAboutOWTS DesignI(t iliþilfi#nfÉtr*iÏiå*'"
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An Employcc Owncd Compony
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
: kaglenwood@kumarusa.òom
www,kumarusa.com
REgÉflüË"dE:
Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
JAN T I 2022
GARFIELD COUNTY
COMMUNITY DEVELOPMENT
ONSITE \ryASTE\ryATER TREATMENT SYSTEM DESIGN
PROPOSED RESIDENCE
TRACT 20, ANTLERS ORCHARD
152 RUSTY SPUR TRAIL
GARFIELD COUNTY, COLORADO
PROJECT NO. 21-7-306
NOVEMBE,R29,202l
PREPARED FOR:
CHELA MURILLO
P. O. BOX 885
srLT, coLoRADO 81652
@
TABLE OF CONTENTS
INTRODUCTION.
PROPOSED CONSTRUCTION
SITE CONDITIONS
OWTS OPERATION AND MAINTENANCE......
OWTS HOUSEHOLD OPERATION
OWTS MAINTENANCE.......
OWTS CONSTRUCTION OBSERVATION
LIMITATIONS
FIGURES
FIGURE 1 _ OWTS SITE PLAN
FIGURES 2A ANd 2B _ USDA GRADATION TEST RESULTS
FIGURE 3 _ SOIL TREATMENT AREA CALCULATIONS
FIGURE 4 _ SOIL TREATMENT AREA PLAN VIEV/
FIGURE 5 _ SOIL TREATMENT AREA CROSS SECTION
ATTACHMENTS
VALLEY PRECAST 1,500 GALLON, TV/O-CHAMBER SEPTIC TANK DETAIL
TUF-TITE 4-HOLE DISTRIBUTION BOX
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SUBSURFACE CONDITIONS .......- 1 .
OWTS ANALYSIS ..-2-
DESIGN RECOMMENDATIONS ...............
SOIL TREATMENT AREA
OWTS COMPONENTS
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Kumar & Associates, lnc.ProJect No.2l-7-306
INTRODUCTION
This report provides the results of an onsite wastewater treatment system (OWTS) design for the
proposed residence to be located on Tract 20, Antlers Orchard, 152 Rusty Spur Trail, Garfield
County, Colorado. The purpose of the report is to provide design details for the OWTS in
accordance with the Garfield County Environmental Health Department Onsite'Wastewater
Treatment System Regulations and the Colorado Department of Public Health and
Environmental Regulation#A3. The services are supplemental to our agreement for professional
services to Chela Murillo dated March 29,2021.
PROPOSED CONSTRUCTION
The residence will be a three-bedroom single-family structure located on the lot as shown on
Figure 1. The OWTS will be designed for a total of five bedrooms to allow for future expansion.
The proposed soil treatment area (STA) for the OWTS will be located to the south of the
residence as shown on Figure 1. V/ater service will be provided by an onsite well. The location
of the well and route of the water supply line to the residence has not been designed at the time
of this report.
If proposed construction is different than that described, we should be contacted to re-evaluate
our design recommendations.
SITE CONDITIONS
The site was vacant at the time of our field exploration. An access road had been graded into the
building site. The terrain at proposed building area slopes down to the south at l0 to 15 percent
grade. Vegetation consists of grass and weeds with sagebrush, and alarge cottonwood tree to
east of building area. Sandstone/siltstone bedrock outcrops to the southwest of building site.
SUBSURFACE CONDITIONS
The field exploration for the OWTS was conducted on April 1, 2021. Two profile pits (Profile
Pits 1 and2) were dug with a mini-excavator atthe approximate locations shown on Figure 1 to
evaluate the subsurface conditions at the planned soil treatment area for the OWTS. The pits
were logged by a representative of Kumar & Associates. Logs of the profile pits are provided
below.
Kumar & A¡¡oclates, lnc.ProJect N0.21'7.306
Depth USDA Classification
0-1'TOPSOL; organic Loam, firm, slightly moist, brown.
1
)5 ,SANDY LOAM; moderate blocky structure, very stifÏ, slightly moist, brown.
5 )7',WEATHERED CLAYSTONE BEDROCK; hard, slightly moist, gray
o
o
a
Disturbed bulk sample obtqinedfrom 2 to 4 feet.
Bottom of pit @ 7 feet.
No groundwater or redoximorphic.features observed at time of pit excavation
n
Log of Profile Pit I
Log of Profïle Pit 2
The soils encountered in profile pits, below about 1 foot of organic topsoil, consisted of Sandy
Loam down to the pit depth of 8 feet at Profile Pit2. Af Prof,rle Pit l, the Sandy Loam was
underlain by weathered claystone bedrock at a depth of 5 feet. Hydrometer and gradation
analyses were performed on a disturbed bulk sample of the soils from Profile Pit 1 from 2 to 4
feet depth and Profile Pit 2 from l%to 3Yz feet depth with the results provided on Figures 2A
and2B., respectively. The tested samples (minus No.10 size sieve fraction) classiff as Sandy
Loam per the USDA system. No free water was encountered in the pits nor indications of
seasonal high groundwater were observed at the time of the pit excavations.
Based on the subsurface conditions and laboratory testing, the soils at the STA have been
classified as Type 2 per State regulations, which equates to a long-term acceptance rate (LTAR)
of 0.60 gallons per square foot per day.
OWTS ANALYSIS
Based on the site conditions and profile pit evaluations, the evaluated area should be suitable for
a conventional infiltration disposal system. There is adequate elevation difference from the
proposed ground floor of the residence down to the STA for gravity flow of the sewer effluent.
The STA will consist of chambers in a trench configuration based in the Sandy Loam soils. The
STA will be sized fbr five bedrooms (eight persons) and an average daily flow of 75 gallons per
person, and an LTAR of 0.60 gallons per square foot per day for the natural Sandy Loam soils.
Depth USDA Classification
0-1'TOPSOIL; organic Loam, firm, moist to slightly moist, dark brown.
1'-8',SANDY LOAM; moderate blocky structure, very stiff, slightly moist, brown.
a
a
a
Disturbed bulk sample obtqined from I % to 3 % feet
Bottom of pit @ I feet.
No groundwater or redoximorphic.features observed at time of pit excavqtion
Kumar & Assoclates, lnc.ProJect No. 21-7.300
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The effluent will gravity flow from the residence to the septic tank for primary treatment and
then gravity flow to the STA for dispersal and final treatment. The STA will consist of three
trenches with Infiltrator Quick 4 Plus Standard chambers. Equal distribution will be provided to
the chambers and trenches by a distribution box.
Due to the presence of relatively shallow bedrock at Profile Pit2, an additional profile pit should
be excavated at the time of construction near the eastern end of the STA to veri$ the required
4 feet ofsoil separation from the bottom ofthe trenches to the bedrock surface.
The location of the onsite well and the route of the planned water supply line to the residence are
currently not known. The setback of the well from the septic tank, effluent lines, and sewer lines
is 50 feet. The setback of the well from the STA is 100 feet. The required setback of the water
line from the septic tank is l0 feet, 5 feet for sewer and effluent lines, and 25 feef from the STA.
We should be notified for additional recommendations if these setbacks cannot be met.
DESIGN RECOMMENDATIONS
The design recommendations presented below are based on the proposed construction, the site
and subsurface conditions encountered and our experience in the area. A layout of the proposed
OV/TS components is provided on Figure 1. If conditions encountered during construction are
different than those that are described in this report, we should be contacted to re-evaluate our
design recommendations.
SOIL TREATMENT AREA
. The STA will consist of three trenches with 20 Infiltrator Quick 4 Plus Standard
chambers placed in each trench (60 chambers total) in the native soils. Equal distribution
will be provided to the trenches by a distribution box.
o The STA was sized based on an LTAR of 0.60 gallons per square feet per day.
o Each chamber was allowed 12 square feet of area . A 30% reduction of the STA size was
applied for use of Infiltrator chambers in a trench configuration. The total STA design
size is 720 squarc feet. Soil treatment area calculations are shown on Figure 3.
o A minimum of four feet of undisturbed soil between trenches is required.
o Trench cut depths should be a maximum of 2 feet below existing ground surface.
o The trenches should be oriented along ground contours to minimize soil cut and cover.
o The base and sidewalls of the trench excavations should be scarified prior to the chamber
placement.
o A minimum of 12 inches and a maximum of 24 inches of cover soil should be placed
over the chambers.
Kumar & A¡¡oclates, lnc.ProJgct No,21.7.306
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. Backfill should be graded to deflect surface water away from the STA and should be
sloped at 3 horizontal to 1 vertical or flatter. A swale to divert surface water flow away
from the STA may be needed along the upslope side.
o Disturbed soil should be re-vegetated as soon as possible with a native grass mix. No
trees, shrubs or other plants with deep roots should be planted on or near the STA as this
may damage the system piping.
o Four-inch diameter inspection ports should be installed vertically into the knockouts
provided in the chamber end caps. Install ports at eaih end of the trench. The inspection
port piping should be screwed into the top to the chambers and should not extend down to
the ground surface inside the chambers. The inspection ports should extend at least
I inches above the finished ground surface or be protected in a valve box at finished
grade.
o The STA must be a minimum of 100 feet from any well.
o The STA must be a minimum of 50 feet from any inigation ditch or stream.
o The STA must be a minimum of 5 feet from the septic tank.
o The STA must be a minimum of 25 feet from any potable water supply lines.
o The STA must be a minimum of 20 feet from the residence.
o A plan view of the STA is presented on Figure 4 and a cross section of the STA is
presented on Figure 5.
OWTS COMPONENTS
Recommended OWTS components provided below are based on our design details and our
experience with the specific component manufacturers. Equivalent components may be feasible
but need to be approved by us prior to construction.
Septic Tank
o A Valley Precast 1,500 gallon, two-chamber septic tank should be used for primary
treatment and dosing to the STA. A detail of the tank is provided as an attachment.
o An effluent filter should be installed in the tank outlet tee.
o The septic tank must be a minimum of 50 feet from any well.
o The tank must be a minimum of 5 feet from the residence.
o The tank must be a minimum of 10 feet from any potable water supply lines.
o The tank must be set level. The excavation bottom must be free of large rocks or other
objects that could damage the tank during placement. A road base or gravel bedding
material may be needed to prevent tank damage during placement and act as a leveling
course.
Kumar & Assoclates, lnc.ProJoct No,21.7-306
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o The tank lids must extend to final surface grade and made to be easily located.
o Install the tank with2 feet minimum cover soil for frost protection. Maximum tank soil
cover is 4 feet.
Sewer Pipe
o The sewer line to the septic tank should not be less than the diameter of the building
drains and not less than 4 inches in diameter.
o The sewer pipe should have a rating of SDR35 or stronger. Schedule 40 PVC pipe is
required beneath any driveway surfaces.
o The sewer pipe should be sloped between 2%o to 4Yo to help limit disturbance of solids in
the tank and potential sewage bypass of the first chamber of the tank. If a steeper slope is
needed, this can be accomplished with venical step-downs in the sewer line.
o A minimum 24 inches of cover soil should be provided over the sewer pipe. Paved areas,
patios or other areas without vegetative cover may be more susceptible to frost and we
recommend 48 inches of soil cover over the sewer pipe in these areas, and the pipe be
insulated on top and sides with 2-inch-thick blue foam insulation board. If adequate soil
cover is not possible, we should be contacted for re-evaluation prior to installation.
o The sewer pipe should be bedded in compacted%-inch road base or native soils provided
that the native soils contain no angular rocks or rocks larger than2% inches in diameter
to help prevent settlement of the pipe. Sags in the pipe could cause standing effluent to
freeze and damage the piping.
o Install cleanout pipes within 5 feet of the building foundation, where the sewer pipe
bends 90 degrees or more and every 100 feet of sewer pipe.
o All 9O-degree bends should be installed using a 9O-degree long-sweep or by using two
45-degree elbows.
o The sewer line location shown on Figure 1 is considered conceptual. We assume that
there will be only one sewer line exiting the residence. It is the responsibility of the
owner/contractors to locate all sewer line exit locations and connections to the septic
tank. We should be notified if there are other sewer lines exiting the building.
Effluent Transport Piping
o The effluent transport pipe should be 4-inch diameter SDR35 piping sloped at a2o/o
minimum to flow from the septic tank to the distribution box and from the distribution
box to each trench. Piping should extend at least 6 inches into the top knockout provided
in the Infiltrator end caps and be screwed in place. Splash plates should be installed
Kumar & A¡¡oclate¡, lnc.Prolect No.21.7.306
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beneath the inlet piping to help limit scouring of the infiltrative soil surface in the
chambers.
The effluent transport pipe should be bedded in compacted3/o-inch road base or native
soils provided that the native soils contain no angular rocks or rocks larger than
2Yz inches in diameter to help prevent settlement of the pipe. Sags could cause standing
effluent to freeze and damage to the piping.
A minimum 18 inches of cover soil should be provided over the effluent transport pipe.
Paved areas, patios or other areas without vegetative cover may be more susceptible to
frost. We recommend 48 inches of soil cover over the effluent pipe and insulation with at
least2 inches of rigid foam insulation in these areas. If adequate cover soil is not
possible, we should re-evaluate the condition prior to installation.
Schedule 40 PVC pipe is required underneath driveway surfaces and should be provided
with at least 48 inches of soil cover, and be insulated on top and sides with 2-inch thick
rigid foam insulation board.
All 90-degree bends should be installed using a 90 degree long-sweep or by using two
45-degree elbows.
Distribution Box
o The distribution box will be used to equally divide effluent flow between the trenches.
We recommend the Tuf-Tite 4-Hole Distribution Box since it is easily accessible from
ground surface for maintenance. A copy of the distribution box detail is provided as an
attachment to this report.
o The distribution box outlet pipes should be equipped with Tuf-Tite speed levelers for ease
of initial setup and adjustment over time.
o The distribution box should be a minimum of 18 inches below grade with risers and an
access lid at or above grade.
o The distribution box must be accessible from ground surface for inspection and
maintenance per the State guidelines.
o The effluent line from the septic tank should be directed downward into the distribution
box with a 9O-degree elbow inside the box.
o The distribution box must be installed level on a compacted road base subgrade to ensure
equal effluent distribution. If settlement of the distribution box occurs, unequal effluent
distribution may take place which could cause hydraulic overload of one of the trenches
and potential failure. The distribution box should be monitored periodically, and the
speed levelers should be adjusted as necessary for levelling.
Kumar & A¡soclatea, lnc.ProJect No.21-7.306
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The ground surface above and around the distribution box should be graded to drain away
surface water to prevent standing water near the distribution box which could freeze or
cause settlement.
OWTS OPERATION AND MAINTENANCE
The OWTS will require periodic inspection and maintenance to function properly. A properly
designed, installed and maintained system can greatly increase its lifespan. The level of
maintenance will vary depending on the complexity of the system and water use habits of the
residents. We recommend that an OWTS Operation and Maintenance (O&M) Manual be
developed. Depending on the complexity of the system, a contract with an OWTS maintenance
provider may be prudent. Below are some basic recommendations for the OWTS O&M.
OWTS HOUSEHOLD OPERATION
o Use of high efficiency water fixtures is recommended to decrease the hydraulic load on
the OWTS system.
o Fix plumbing leaks immediately as this may cause a hydraulic overload of the soil
absorption system.
r Do not irrigate the area on top of or directly upgradient of the soil absorption field as this
may cause a hydraulic overload.
o Do not dispose of household waste down drains as this may clog or damage OV/TS
components. Examples of household waste includes: dental floss, cotton swabs, coffee
grounds, paper towels, feminine products and many other kitchen and bath items.
o Use of kitchen garbage disposals is not recommended. If a garbage disposal is utilized,
kitchen wastewater should be screened thoroughly. Many kitchen solids are not
decomposed in the septic tank and may cause increased tank pumping frequency.
o Do not dispose of household chemicals, greases, oils, paints, hot tub water or water
softener backwash in household drains. A separate drywell, if feasible, may be necessary
for hot tub water or water softener backwash disposal.
o Limit the use of bleach as this may harm useful bacteria in the septic tank and soil
absorption system.
o Liquid dishwasher and clothes washer detergent is recommended for households served
by an OWTS. Clay substances used as flrllers in powder detergents may result in
clogging of the soils absorption system.
o The effluent in septic tanks can freeze during extended periods of non-use in cold
weather. We recommend that a tank heater be installed in this system to help prevent
freezing.
Kumar & As¡oclatel, lnc.ProJect No, 21.7.306
-8-
OWTS MAINTENANCE
. Inspect the septic tank, distribution box and STA at least annually for problems or signs
of failure.
o The effluent filter for the tank should be cleaned at least annually by spray washing solids
into the first chamber of the septic tank.
o The septic tank should be pumped and cleaned every 3 to 5 years depending on use.
Longer pumping intervals may increase the amount of solids that reach the STA, which
may shorten its life span.
o Pumping of the septic tank should take place when the level of the sludge and scum
layers combined take up 25 to 33o/o of the capacity of the first chamber of the tank.
OWTS CONSTRUCTION OBSERVATION
The Garfield County Environmental Health Department requires that the designer of the system
provide a record drawing and certification of the OWTS construction (As-Built inspection).
We should be provided with at least 48-hour notice prior to the installer needing the inspections
Prior to issuance of our certification letter, we require observation of all system components
prior to backfill. The number of site visits required for the inspection will depend on the
installer's construction schedule.
LIMITATIONS
We have conducted this design in accordance with generally accepted engineering principles and
practices in this area at this time. We make no rúarranty either expressed or implied. The
recommendations provided in this report are based on the site conditions, profile pit evaluations
and soil texture analysis, the proposed construction and our experience in the.area. Variations in
the subsurface conditions may not become evident until excavation is performed. If conditions
encountered during construction appear different from those described in this report, we should
be notified so that re-evaluation of the recommendations may be made.
This report has been prepared for the exclusive use by our client for design pulposes. We are not
responsible for technical interpretations by others of our information. As the project evolves, we
should provide continued consultation and field services during construction to review and
monitor the implementation of our recommendations, and to veriÛ' that the recommendations
have been appropriately interpreted. Significant design changes may require additional analysis
or modifications to our design.
Kumar & As¡oclates, lnc.ProJect No,21.7.306
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It is our opinion that the designed location of the OrülTS components does not violate any
setback requirements of the current Garfield County Regulations. Below is a table of common
minimum horizontal setbacks to OV/TS components. Refer to the Garfield County Regulations
for a complete list of required setbacks. Vy'e recommend the O\MTS components be surveyed by
a Professional Colorado Land Surveyor.
Table 1 - Common Minimum Horizontal Setbacks from OWTS
Please contact us for any necessary revisions or discussion after review of this report by Garfield
County. If you have any questions, or if we may be of further assistance, please let us know.
Respectfully Submitted,
Kumar & Associates, Inc.
:Ø**WÞ
Shane M. Mello, Staff Engineer
Reviewed by:
David A. Young,
SMMlkac
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50'10'50',5 0'10'Building
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Kumar & Associates, lnc.Project No. 21-7-306
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TREATMENT AREA (srA) r
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Fig. 1OWTS SITE PLAN21 -7 -306 Kumar & Associates
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CLAY COBBLES
,002 mm .02 '05
SAMPLE OF: SANDY LOAM
.25 ,5 I Zmm 5 20
FROM: PROFILE PIT 1 AT 2 T0 4 FEET
ENTIRE SAMPLE
PARTICLE SIZE DISTRIBUTION %
COBBLES 0
GRAVEL 2
SAND 72
SILI 15
CLAY t3
PORTION OF SAMPLE
PASSING #10 SIEVE
PARTICLE SIZE DISTRIBUTION %
SAND 73
SILT 13
CLAY 11
TOTAL SAMPLE RETAINED ON f10 SIEVE: 2%
PERCENT OF MATERIAL RETAINED ON #10 SIEVE
PASSTNG 5/4" S|EVE: 1OO%
NOTE: Hydrometer Anolysis wos Performod on o
bulk somplo followlng screenlng of oll molerlol
lorger lhon the ¡f10 sieve (2.0 mm) per USDA
guldelines.
fhca! llrl rosull! qpply only lo lhr
eqmpl.s whlch w!rc tlsl¡d. lhr
hlllng rcport sholl nol ba rcproduced,
oxcapl ln tull, wllhout lho wrlllsnqpproyol of Kumqr & A9goclql.s, lnc,
Siovr onolysl! losllng lt pcrformad ln
occordonca wlth ASTM 0,122, ASTM C135qnd/or ASTM Dtt40.
SIEVE ANALYSISHYDROMETER ANALYSIS
lIME READINCS
IMll2,4 HRS 7 HRS
CLËAR SQUARE OPENINOSU,S. SIANDARD SERIES
GRAVELSANDSILT
COARSEV. FINE FINE MEDIUM co.v. co.FINE MEDIUMFINEco.
GRAIN SIZE
(mm)SIEVE SIZE % FINER
127.00 100
78.00 100
38.1 0 1-1 /2"f00
19.05 3/4 100
9.50 3/8"100
1.75 #1 99
2.OO #10 9E
1.00 #18 97
0.50 #35 91
0.25 #60 7A
0.1 06 +1 10 17
0.045 #525 26
GRAIN SIZE
('n-)
TIME PASSED
(mln)% FINER
0.037 25
0.019 4 23
0,009 19 19
0,005 60 l9
0.002 455 15
0.001 15¡t5 11
21 -7 -306 Kumar & Associates USDA GRADATION TTST RTSULTS Fig.2A
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SAMPLE OF: SANDY LOAM
FROM: PROFILE PIT 2 AT 1'1/2 10 3-1/2 IEET
ENTIRE SAMPLE
PARTICLE SIZE DISTRIBUTION %
COBBLES 0
GRAVEL 3
SAND 68
SILT 't6
CLAY 15
PORTION OF SAMPLE
PASSING #10 SIEVE
PARTICLE SIZE DISTRIBUTION %
SAND 70
SILT 17
CLAY l3
TOTAL SAMPLE RETAINED ON jl10 SIEVE: 3%
PERCENT OF MATERIAL RETAINED ON #10 SIEVE
PASSTNG 5/4" SIEVET 1OO%
NOTE: Hydromeler Anolysls wos performed on o
bulk somple following screenlng of oll moterlol
lorger lhon the f10 sleve (2.0 mm) per USDA
guldellnes,
Thrsr losl rosull3 opply only lo lhr
sqmpbs whlch w.ro llshd, Thc
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Siovo onolycl¡ hlllng l! p€rtormrd ln
qcçordonco wlth ASTM 0,122, ASIM C136qnd,/or ASTM Dlt,lo.
HYDROMETER ANALYSIS SIEVE ANALYSIS
IIME READINOS
l MIN2,4 HRS 7 HRS
U,S. STANDARD SERIES
¡t¡
CLÊAR SQUARE OPENINGS
!/^. !tl. I ttr.
SAND GRAVELSILT
FINE MEDIUM co.v. co.FINE MEDIUM COARSEFINEæ.V, FINE
GRÀIN SIZE
(m'n)SIEVE SIZE % FINER
127.0O 100
76.00 100
58.1 0 1-1 /2"100
19.05 3/4"100
9,50 3/8"f00
4.75 *4 99
2.00 #10 97
1.00 #18 96
0.50 #35 91
0,25 #60 66
0.1 06 t|l 10 56
0.0¡t5 *325 29
GRAIN SIZE(-'n)TIME PASSED
(mln)% FINER
0.037 29
0.019 1 21
0.009 19 20
0.005 60 l8
0.002 455 15
0.001 t 545 13
21 -7 -306 Kumar & Associates USDA GRADATION TEST RESULTS Fis.2B
OWTS SOIL TREATMENT AREA CALCULATIONS
In accordance wtlh the Garfeld County OWTS Regulations and the Colorado Depatment of Publb Health
and Environment's Regulation #43, the soiltreatment area was cabulated as follows:
CALCULATION OF OWTS DESIGN FLOW:
q = (F)(N)
N = 2 PERSONS PER BEDROOM FOR FIRST 3 BEDROOMS
AND 1 PERSON PER BEDROOM FOR EACH ADDITIONAL BEDROOM
WHERE:
Q = DESIGN FLOW
F = AVERAGE FLOW PER PERSON PER DAY
B = NUMBEROF BEDROOMS
N = NUMBER OF PERSONS
þ=
$=
N=
Q=
75 GALLONS PER DAY
5 BEDROOMS
8 PERSONS
600 GALLONS PERDAY
CALCULATION OF OWTS SOIL TREATMENT AREA:
MINIUMUM TREATMENT AREA = Q + LTAR
WHERE:
Q=
LTAR (SOIL TYPE 2) =
600 GALLONS PER DAY
0.6 GALLONS/FTTDAY
MINIMUM SOIL TREATMENTAREA =1000.0 SQUARE FEET
REDUCTION FACTOR FOR CHAMBERS =0.70
MINIMUM SOIL TREATMENTAREA WITH REDUCTION = 7OO SQUARE FEET
AREA PER INFIHRATOR QUICK 4 STANDARD CHAMBER =
TOTAL CHAMBERS NEEDED =
12 SQUARE FEET
59 CHAMBERS
NUMBER OF TRENCHES =
CHAMBERS PERTRENCH =
TOTAL NUMBER OF CHAMBERS AS DESIGNED =
3 TRENCHES
20 CHAMBERS
60 CHAMBERS
TOTAL SOIL TREATMENTAREA =720 SQUARE FEET
21-7-306 Kumar & Associates SOIL TREATMENT AREA CALCULATIONS Fis. 3
4 INCH DIAMETER
NON-PERFORATED
SDR55 TRANSPORT
PIPE SLOPED AT
A 2% MIN. DOWN
TO DISTRIBUTION
BOX.
4 INCH DIAMETER
NON-PERFORATED
SDR35 TRANSPORT
PIPE SLOPED AT
A 2% MIN. DOWN
TO TRENCH.
TUF_TITE 6_HOLE
DISTRIBUTION BOX
INFILTRATOR QUICK4 PLUS
STANDARD CHAMBERS IN 3
TRENCHES. 20 CHAMBERS
PER TRENCH (60 TOTAL).
TRANSPORT PIPING SHOULD BE
INSERTED AT LEAST 6 INCHES
INTO THE UPPER KNOCKOUT IN
THE END CAP. INSTALL SPLAS
INFILTRATOR QUICK4 PLUS STANDARD
END CAP.
PLATES BENEATH INLET PIPING
TO HELP LIMIT SCOURING OF THE
INFILTRATIVE SURFACE.
4 INCH DIAMETER PVC OBSERVATION PORTS
INSTALLED VERTICALLY INTO THE KNOCKOUTS
PROVIDED IN END CAPS, INSTALL PORTS AT
EACH END OF EACH TRENCH. REMOVABLE
LID TO BE PLACED ON TOP OF PIPE, PIPE
MUST STICK UP AT LEAST 8 INCHES ABOVE
FINISHED GRADE OR BE PLACED AT GRADE IN
AN ACCESSIBLE VALVE BOX. PIPES SHOULD
NOT EXTEND TO SOIL SURFACE AND SHOULD
BE SECURED TO CHAMBER WITH SCREWS OR
COUPLINGS TO PREVENT SLIDING DOWNWARD.
1 10 0
SCALE- FEET
Notes:
.l . Chambers should be installed level on a scarified ground surface. Concrete sand may be used as a leveling course if
necessary.
2. Care should be taken by the contractor to avoid compaction of the native soils in the trench areas. The base and side walls of
trench excavations should be scarified prior to chamber installation.
3. All piping should have a rating of SDR35 or stronger.
4. Changes to this design should not be made without consultation and approval by Kumar & Associates.
S. Refer to the 2018 Gafield County Onsite Wastewater System Regulations for other applicable specifications.
21 -7 -306 Kumar & Associates SOIL TRTATMENT AREA PLAN VIEW Fig. 4
Native Soil
Trenche
Soil
Between
lnfiltrator Quick 4 Plus
Standard Chamber Excavate 36"
Wide Trench
'12" min. 24" max.
Cover Soil Graded
to Deflect Surface
Water
lnstalled Level
Approx.Existing Ground Surface
Scarify ground surface prior
to chamber placement.
Notes:
1. Chambers should be installed level on a scarified ground surface. Concrete
sand may be used as a leveling course if necessary.
2. Care should be taken by the contractor to avoid compaction of the native soils in
the trench areas. The base and side walls of trench excavations should be
scarified prior to chamber installation.
3. Changes to this design should not be made without consultation and approval
by Kumar & Associates.
2.5
SCALE- FEET
21 -7 -306 Kumar & Associates SOIL TREATMENT AREA CROSS SECTION Fig. 5
íSOO Gallon Top Seam -2CPItem #
l500T.2GP
DESIGN NOTES¡ Design per performonce test per ASTM
c|227r Top surfoce oreo 62.55 ft'¿¡ f'c @ 28 doys; concrete = 6,000 PSI
Min.
ln stollotion:¡ Tonk to be set on 5" min. sond bed or
peo grovel¡ Tonk to be bockfilled uniformly on oll
sides in lifts less thon 24" ond
mechonicolly compocted¡ Excovoted moteriol moy be used for
bockfill, provided lorge stones ore
removedo Excovotion should be dewotered ond
tonk filled with woter prior to being put
in service for instollotíon with woter
toble less thon 2' below grode¡ Meets C1644-06 for resilient connectors¡ lnlet ond Outlet identified obove pipe¡ Delivered complete with internol piping
¡ 4' Moximum bury depth
,-Eè'.ir
Top
View
l-
J 2üOearAccæs
i i¡*r lLrD j
[l
:-..-:?1.J.t
Rlsers b Gnade
Boot Rubber
Sealant
6i 3n
5i ]n
Section
View
. Disgine Sngcs
13' Long x I' Wide
56" below inlet
lnvert Dimensions Net Copocity Net Weíght
lnlet 0ullet Length width Height lnlet Side Outlet Totol Lid Tonk Totol
56"53"132"68"68"1002 gol 507 gol 1509 gol 3600 lbs 11180 lbs 14780 lbs
ALLOWABLE BURY
(Bosed on Woter Toble)
WAÏER TABLE ALLOWABLE
FARTH FILL
0'- 0"3'- 0"
1'- 0"3'-0"
2'-O"4'-O"
3'-O"4'-O"
DRY 4'- 0"
Phone: 719€956764
Fax 7l$39æ7n
Webelb: www.valleypr€castæm
Emal | : fionHesk@val le¡precasùoomBuena Vlsta, Colorado
PRECAST,Inc.
Tough
Providing
Problem
a simple, reliable, and
-
permanent means for dividing septic
tank effluent flow.
TUF-TITE Solution
A strong, stable, permanent,
non-corrosive Tuf-Tite Distribution
Box, with a Tuf-Tite Speed Leveler
in each outlet,
I lnjection molded HDPE
I Non-corrosive
f Simple to install
I Easy to level
ln a septic environment, no other
materialcan match High Density
Polyethylene in delivering a lifetime
of trouble-free service. Tuf-Tite
Distribution Boxes are injection
molded, using only premium HDPE
which contains no fillers or foam.
Snap-in pipe seals
They're patented. Simply insert your
PVC pipe and push it through the
flexible, polyethylene Tuf-Tite seal.
Pipes fit watertight. lnstallation couldn't
be easier.
They're permanent
Unlike cement-based pipe grout,
TuËTite seals will not crack or corrode
in septic conditions. They stay pliable
and watertight permanently.
TU THole
I lnjection molded.
Exceptionally
11"
2" Drop
S-35 '/l¡s-40
P-10
Choice of Fittings
S-35 Pipe Seal, for:
t Sewer and Drain
r SDR 35 T ASTM 3034
r Thin Wall r 1500 Lb. Crush
S-40 Pipe Seal, for:
I Schedule 40
I 4" Corrugated
P-10 Plug, for unused holes
strong,
Choice of Lids
Regular Lid. Molded of rugged
HDPE.
lnspection Pod Lid, For easy
access and inspection. Models
available to accept either 4" or
6" extension pipes.
Interlocking Lid. Heavy-duty
HDPE Lid is ribbed for added
strength and rigidity. Slotted
sides interlock on the
Distribution Box to assure a
tight fit.
The 4HD2 Distribution Box
comes complete with a
Regular Lid or an lnspection
Port Lid, and 5 snap-in
fittings of your choice.
Model 81 Riser. For series
81 Box. Stackable HDPE
Risers extend to grade in 6"
increments. Accept 11" x 11"
lids and grates.
Tuf-Tite Speed LevelersTM
Control the flow of effluent from
the Distribution Box. Simply
insert a Speed Leveler into each
outlet pipe. Rotate each Speed
Leveler so the flow is distributed
as desired, Available for 3" or 4"
PVC pipe.
t HDPE is non-
corros¡ve
in a septic
env¡ronment.
1sVi',
11"
I Patented snap-¡n
p¡pe seals
simplify
installation.
INSTALLATION IS
JUST THIS SIMPLE
1. Position the Distribution Box
on level virgin soil,
Do not place box on a
concrete slab.
2. lnstallthe inlet pipe and
outlet pipes. Be sure the
bottoms of all pipes rest on
virgin soil.
3. Levelthe Distribution Box
and all pipes as needed.
4. Backfill the pipes to within
two feet of the Distribution
Box. Recheck the level of the
box, then backfill up to the
top lid ridge.
5. lnstall and adjust Tuf-Tite
Speed Levelers.
6. Place lid on the Distribution
Box and finish backfilling.
'1
6"
.;1,îr"TUt'TITE'il t
Drainage and Septic Products
Tuf-Tite' Corporation
1200 Flex Court
Lake Zurich, lllinois 60047
O1 999 Tuf -Tite@ Corporation
*
f
A lull line of
innovations for
befter sepfic
systerns
Form 4HD2'3. Pr¡nled in USA