HomeMy WebLinkAboutEngineer's OWTS Design PlanK-CROATI(P.(). Box 40
Mack, C0 Br
9 7 o. 2 j o. o 57 2 f ka ch ay I a. cr o nl< @ outlooh. c ont
Onsite Wastewat e T rcatrrrent System Desrgn
August IB, ZO25
Pattison Project
-TBD- CRZZ3
Rifle, CO 81550
Parcel No. 21 77 -0I2-OO-542
Prepared By:
K-Cronk Engineering, Inc.
P.O. Box I40
Mack, CO 81525
970-250-0572
Site History
The owner of the property wishes to construct a three-bedroom residence, which will be served by a new
onsite wastewater treatment system (OWTS).
The site consists of approximately 3.6 acres of cultivated native soil. Drainage is approximately 2Yotothe
south. A soils evaluation and site study were conducted on the proper(y of reference on 08/08/25 by
Kachayla R. Cronku. Soils evaluation trench A was located approximately 175' north of the south property
line and 180' east of the west property line.
This OWTS design has been prepared for the project based on information disclosed during the site study
mentioned above. A discussion ofthe engineered OWTS design follows. The location ofthe soils evaluation
trenches are shown on the Plot Plan included in this report.
Development of Design Parameters
Soils evaluation trench A was extended to a depth of 84" below ground surface (BGS). No groundwater or
evidence of periodically saturated soils was observed to a depth of 84" BGS. No limiting layer was
identified to a depth 84" BGS. The soils evaluation indicates two distinct soil horizons underlie the site. A
lithological description follows:
depth (in.) description
0" - 30"
30" - 84"
sandy clay loam, brown
(Soil Type 3, USDA - sandy clay loam, granular, moderate structure)
sandy clay loam, brown
(Soil Type 3,A, USDA - sandy clay loam, massive, structureless)
Soils evaluation trench B was extended to a depth of 48" below ground surface (BGS). The soils lithology
matched that described for trench A above.
Based on the results from the 08108125 soils evaluation, Soil Type 34 and corresponding long term
acceptance rate (LTAR) of 0.30 are chosen for overall system sizing for an infiltrator trench soil treatment
area designed to discharge to subsoils below the 24" depth.
u Kachayla R. Cronk holds a Certificate of Attendance and Examination from the CPOW Visual and Tactile
Evaluation of Soils Training.
-1-
System Design
The installer shall confirm the feasibility of gravity discharge of sewage effluent from the foundation line
to the soil treatment area by field verification of required parameters. Gravity sewer lines that transport
solid waste material must maintain a minimum fall of l/4" per foot (2% slope); gravity effluent lines that
transport only liquid waste material must maintain a minimum of l/8" per foot (l% slope).
If site conditions do not allow for the requirements mentioned above to be maintained, gravity discharge of
septic effluent cannot be assured, and a lift station may be required. Please contact the design engineer and
Garfield County to address any design modifications necessary if these design assumptions are not upheld.
A chamber trench soil treatment system is proposed for discharge of septic effluent at the site. Construction
of the system will consist of excavating level trenches in the area comprising the soil treatment area.
Grading during construction may affect slope. therefore contractor shall verifv slope at time of
installation. Soil treatment area orientation mav be adiusted per site variations to facilitate consistent
trench denth runnins llel fo final contorrrs-The initial excavation shall be continued to a level depth
of 24" BGS (see Soil Treatment Area Cross Section). If consistent trench degth cannot be maintained.
be installed level at
Following completion of the trench excavations, chambers will be used to construct a septic effluent
distribution system in the open excavations. The chambers will be installed in accordance with the
manufacturer's specifications, available here for Infiltrator Quick4 Standard Chambers:
httos://www.infiltratorwater.com/Customer-Content/ www/CMS/files/chamber-manuals/PLUS09
052913.pdf
After the chamber distribution system is installed, non-woven geotextile filter fabric will be placed over the
chambers and the system will be covered with a soil cap. The soil cap will consist of approximately 12"
min. of sandy loam. The soil cap will be mounded SYo above the existing ground surface to promote surface
run off away from the soil treatment area.
A 1,000 gallon, two compartment septic tank is required to provide a minimum of 48 hours retention time
for sewage generated from the proposed project. The tank must be approved and accepted by CDPHE for
use as a septic tank. A list of such tanks may be found here: https://cdphe.colorado.gov/OWTS under
"Regulation 43: product acceptance lists". Water-tight risers to surface with securely fitted lids for access
to all compartments of the septic tank will be provided. A non-corrodible filter shall be installed at the final
outlet tee of the septic tank to limit the size of solids and sludge passing into the soil treatment area. The
filter must be accessible for cleaning and replacement from the ground surface. A distribution box is
required to provide equal distribution of septic effluent from the septic tank to the soil treatment area
laterals. The distribution box must be placed on stable native soil or compacted structural fill to prevent
settling and assure equal distribution of septic effluent. The distribution box must be accessible for cleaning
and replacement from the ground surface.
1-L-
DESIGN CALCULATIONS
DESIGN LOADING RATE OF 3 BEDROOMS @ 150 GAL.iBEDROOM-DAY:450 gal.lday
DESIGN SOIL TYPE 34,
DESIGN LONG TERM ACCEPTANCE RATE (LTAR):0.30 GAL./SQ.FT./DAY
A: a - wHERE-LTAR'
A: SOIL TREATMENT AREA (SQ. FT.)
Q: DESTGN FLOW (GAL./DAY)
LTAR: LONG TERM ACCEPTANCE RATE (GAL./SQ.FT./DAY)
A:#= 15oo sQ'Fr
SOIL TREATMENT AREA ADJUSTMENT FACTOR FOR GRAVITY TRENCH DESIGN : I.O
SOIL TREATMENT AREA ADJUSTMENT FACTOR FOR USE OF CHAMBERS : 0.7
ADJUSTED SOIL TREATMENT AREA: 1500 SQ.FT. X 1.0 X 0.7: 1,050 SQ. FT.
LENGTH OF 3' WIDE TRENCH REQ',D: 1050 SQ.FT. l3 FT,:350 FT.
USE 4 TRENCHES WITH 18 QUICK4 STANDARD INFILTRATORS (or equivalent) EACH, FOR A
TOTAL OF 90 UNITS
SOIL TREATMENT AREA SIZED AT 5 TRENCHES 3 FT. WIDE X72FT LONG: 1,080 SQ. FT.
As shown in the included graphics, the trench soil treatment system will consist of five (5) trenches 3'
wide x 24" deepxT2' longwith eighteen (18) INFILTRATOR QUICK4 chambers (or equivalent) each
for a total of ninety (90) units. The soil treatment area will encompass an area of 11080 sq. ft.
-J-
Installation - Setbacks" Notifications. and Inspections
The owner and installer shall be aware of and comply with the following installation and system operation
requirements.
The installer must be approved and licensed by Garfield County for installation of onsite
wastewater treatment systems.
All installation activities shall be conducted in accordance with cunent Garfield Countv OZZ,S
Regzla/iorzs. If at any time durins construction. subsurface site conditions are encountered
which differ from the design parameters previously described. construction activities will stop.
and the design engineer and Garfield County will be contacted to address any necessary desien
modifications.
The final cover shall not be placed on sewer lines, septic tank, or the soil treatment area until
the system has been inspected and approved by the design engineer and Garfield County. The
installer shall provide 48-hour notice for all required inspections.
Installation procedures including grade, location, setbacks, septic tank size, and soil treatment
size shall conform with the attached graphic details. Construction activities and system
components will not encroach upon existing easements or utility corridors.
The installer must maintain all setbacks to utility lines, easements, property lines, or other
adverse conditions, whether they are known and shown on the attached graphics or have been
disclosed during construction. Minimum setbacks for system components are:
Septic Tank,
Dosing Tank
Building Sewer,
Effluent Lines
STA
sprins/well/cistem 50 50 100
ootable water suoolv line t0 5 25
structure w/ crawlspace 5 0 20
structure w/o crawlspace 5 0 l0
property lines, piped or
lined inisation
l0 10 l0
subsurface drain,
intermittent irrieation
10 l0 25
lake, water course,
irrieation ditch. stream
50 50 50
cut slope steeper than
3H:lV
10 l0 25
septic tank 5
. Four-inch,Z-way clean out must be installed within 5 ft of the outside of the building.
o All gravity sewer/effluent piping shall rneet minimum ASTM-3034 PVC standard, be 4-inch
in diameter, and have glued joints. Gravity sewer lines that transport solid waste material shall
employ sweep 90's or 2-45's at all tums. Sewer/effluent lines under driveways shall meet
minimum SCHD 40 PVC standards. Additionally, sewer/effluent lines in traffic areas with less
than24" of cover shall be encased in 6" CMP or flow fill and covered with minimum 2" high
density blue board insulation.
r Sewer/effluent lines or domestic water lines shall be encased in minimum SCHD 40 with water-
tight end caps or a minimum of 6" of flow fill at all points with less than 5' separation between
sewer and domestic water lines.
a
a
a
a
a
-4-
a
a
Four-inch clean outs shall be installed at maximum 100' intervals in all gravity sewer lines that
transport solid waste material that exceeds 100' in length.
A minimum of 12" of soil cover (18" recommended) shall be maintained over all gravity
draining OWTS components to prevent freezing of septic effluent (excepting septic tank access
ports which must be extended to the ground surface).
The system contractor shall be aware of the potential for construction activities to reduce soil
permeabilities at the site through compaction, smearing, and shearing. The following
precautions and construction procedures should be employed during installation to minimize
disturbance to native soils:
i. Excavation should proceed only when the moisture content of the soil is below the
plastic limit. If a sample of soil forms a rope instead of crumbling when rolled
between the hands it is too wet and should be allowed to dry before excavation
continues.
ii. Excavation and backfill equipment should work from the surface where at all
practical to avoid compaction of the soils at depth.
iii. The bottom and sidewalls of the excavation should be left with a rough, open
surface. The appearance should be that ofbroken or ripped soil as opposed to a
sheared, smeared, or troweled surface. Any smoothed or smeared surfaces should
be removed with a toothed rake or shallow ripper, taking care to remove loose
residues from the bottom of the excavation by hand if necessary.
iv. Care should be taken in placing fill materials in the excavation to avoid damaging
the exposed soil surfaces.
a
5
Operation - Maintenance and Inspections
The owner shall install a structural barrier if necessary and take precautions to preventvehicular
traffic, excessive surface watering, accidental flooding, or other activities in the vicinity of the
soil treatment area which may compact, saturate, or otherwise alter the subsurface soil
parameters used in designing the septic system.
The owner will plant and maintain grass or other shallow rooted cover crop to prevent erosion
and promote evapotranspiration over the soil treatment area.
Every month:
o Inspect backfill over the septic tank and soil treatment area for signs of settling - provide
additional mounding as needed.
o Inspect area of septic tank and soil treatment area for signs of intrusion by bunowing
animals and deep rooted plants and take measures to prevent future intrusions as needed.
Every year:
o Remove tank lids and inspect outlet effluent filter for damage and clean as needed.
r Inspect soil treatmentarea through the ports provided at the beginning and ends of each
lateral trench for signs of excessive moisture or pooling water.
o Inspect tank risers for signs of high water level markings that may indicate slow drainage
Every four years:
o Remove accumulated sludge from the septic tank by pumping all compartments -
interval may be adjusted to less than four years or more than four years depending on
family specific usage and habits.
OWTS Component Descriptions:
a
ComDonent:Model:Notes:
Septic Tank Infiltrator IM- 1 060-2CP, or equivalent
Tank Riser Infi ltrator EZsnap Riser SNAPIS-24##
&Lid, or equivalent
2", 6o', &, 12" available
Optional Safety Star: SNAPSAFT-
2400
Effluent Filter Orenco Model FTW0436-28
Distribution
Media
Infiltrator Quick4 Standard Chambers +
endcaps, or equivalent
Filter Fabric Non-woven permeable geotextile fabric
(max. 2 oz. lsq. yd), or equivalent
-6-
Limitations
This report is a site-specific design for the installation of an onsite wastewater treatment system and is
applicable only for the client for whom our work was performed. Use of this report under other
circumstances is not an appropriate application of this document. This report is a product of K-Cronk
Engineering, Inc. and is to be taken in its entirety. Excerpts from this report may be taken out of context
and may not convey the true intent of the report. It is the owner's and owner's agent's responsibility to read
this report and become familiar with the recommendations and design guidelines contained herein.
The recommendations and design guidelines outlined in this report are based on: 1) the proposed site
development and plot plan as furnished to K-Cronk Engineering, Inc. by the client, and2) the site conditions
disclosed at the specific time of the site investigation of reference. K-Cronk Engineering, Inc. assumes no
liability for the accuracy or completeness of information fumished by the client. Site conditions are subject
to external environmental effects and may change over time. Use ofthis plan under different site conditions
is inappropriate. If it becomes apparent that current site conditions vary from those anticipated, the design
engineer and Garfield County should be contacted to develop any required design modifications. K-Cronk
Engineering, Inc. is not responsible and accepts no liability for any variation in assumed design parameters.
K-Cronk Engineering, Inc. represents this report has been prepared within the limits prescribed by the
owner and in accordance with the current accepted practice of professional engineering in the area. No
warranty or representation, either expressed or implied, is included or intended in this repoft or in any of
our contracts.
SEAL
Kad^"a,yla"R. CronJ<,
Kachayla R. Cronk, P.E.
os/78/202s
Date
NOTE: This OWTS design is meant to include the following five pages:
1) plot plan
2) septic layout plan
3) notes for your installer
4) soil treatment area plan view
5) soil treatment area cross section.
The plan is not to be implemented in the absence of these sheets.
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NOTEI
CDNTACT DESiGN ENGINEER AT
KACHAYLA,CRENKEEUTLI]EK.COM
PRiER TE INSTALL Tt] OBTAIN
ENTIRE OVTS DESIGN DECUMENT
DRAWINGS MUST BE USED IN
CDNJUNCTIBN WITH'PATTISEN
PROJECT O!/TS DESIGN' DATEI)
AUGUST 18, 2t)E5
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3,6 acres
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K-CROI{/(
PATTISEN PREJECT
- I Bt- LR tt3
?177-Ote-00-54?
PLET PLAN
AUGUST 18, 2025
SCALET 1'=60'
GRAPHIC SHEET 1 UF 4
+
n
NERTH
NETE
THE FOLLOVING SETBACKS MUST BE MAINTAINEDI
SEPTICTANK STA
SPRIN6S,/VELLS 50'
LAKE/STREAM/tRRIG. DITCH-s0,
INTERMITTENT IRRIG. DiTCH-10,
GATET PIPE 10'
SELID PIPE,/LINED IITCH
DoMESTIC VATER CISTERN
-50,DOMESTIC VATER LINE
STRUCTURE V,/CRAVLSPACE
-
5'
STRUCTURE V,/[CRAVLSPACE _ 5'
PRBPERTY LINE 10'
100'
50'
25',
25',
10'
100'
?s',
?0'
10'
10'
dnive
3,5 ocres
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SCHD 40
cteon out
1,250 gqtton, two
conpontnent septlctonk w/ efftuentfitter (ESI Modet
FTV0436-28)
soit treotrnent o.reo (STA)
conslsting of 5 rows of 18
Quick4 Stqndord Infi(trotors(on equlvolent) fon q tototof ninety units
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repalr oneo
NETE
CALL 811 FER UTILITY LI]CATES
pnoposed
nesldence
tlDTEr
THE INSTALLER SHALL CENFIRM THE FEASIBILITY NF
GRAVITY DISCHARGE OF SEVAGE EFFLUENT FRNM THE
IOUN}ATIEN LINE TO THE SOiL TREATMENT AREA BY FIELD
VERIFICATIEN NF THE REOUIRED PARAMETERS. GRAVITY
SEVER LINES THAT TRANSPNRT SELiD VASTE MATERIAL
MUST MAINTAIN A MINIMUM FALL EF I/4' PER FDtrT <?7.
SLI]PE)I GRAVITY EFFLUENT LINES THAT TRANSPDRT ENLY
L]OUID WASTE MATERIAL MUST MAINTAIN A MINIMUM EFI/8' PER FIET (12 SLI]PE),
IF SITE CBNDITIENS DO NET ALLEV FER THE
?EOUIREMENTS MENTIINED ABOVE TE BE MAINTAINED,
SRAVITY DISCHARGE EF SEPTIC EFFLUENT CANNET BE
ASSUREN, AND A LIFT STATION MAY 3E REAUIRED,
NETEI
CENTACT DESIGN ENGINEER AT
KACHAYLA,CRONKEEUTLEIK.CNM
PRIOR TE INSTALL TD ESTAiN
ENTIRE NVTS DES]GN DICUMENT
DRAVINGS MUST BE USED IN
CDNJUNCTIEN V1TH'PATTISNN
PROJECT EVTS
'ESIGN'
DATED
AUGUST 18, 2025
NETE
IF SITE CENDITIONS LIMIT
PRACTICAL INSTALLATII]N BF
STA AS SHI]VN, INSTALLER
MAY CONTACT ENGINEER TO
MI]DIFY TRENCH LAYEUT
PRIER TE INSTALLATION,
NOTE
CDNTRACTER TB VERIFY
SLOPEI SOIL TREATMENT
AREA ORIENTATIEN TO BE
ADJUSTED PER SITE
VARIATIONS TE FACILITATE
CONSISTENT TRENCH DEPTH,
RUNNING PARALLEL TI]
CENTI]URS.
NETE
MAINTAIN FELLEVING
EFFSETS FRDM VELLI
VELL TB TANKI 50' MIN,
VELL T0 STAI 100' MIN,
PATT]SNN PREJECT
-TBn- CR 2e3
?777-01?-00-54?
SEPTIC LAYBUT PLAN
AUGUST 18, 2025
SCALET 1'=30'
GRAPHIC SHEET 1 EF 4
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NIIRTH
,.-K-CROI{K
Uqi'h4'?'ri/.2y|---------|-
K-CROTfK F.tl. &i.t l-1o
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{il-rr, Ji{}, {IiiJ I furrfi rrulo, t'rrrtt&*Aottf Jiu,ft,u:rtnl
NOTES FOR YOUR INSTALLER
This is a STAMPED. ENGINEERED design - yeS, septics are "simple" and water runs downhill.
However, like anything that is engineered, it is critical that you follow the design so the system
performs as intended - I cannot approve a system that was not installed to plans!
If, FOR ANY REASON, you need to:
1. Change the location/rotation of the septic tank (i.e. plumbing was stubbed out of
different wall, etc.)
2. Change the location/rotation of the soil treatment area (i.e. slope differed from the
design, owner has changed the site plan, etc.)
YOU MUST CONTACT THIS OFFICE FOR A REVISED DESIGN!
The revision must be submitted and approved through the County (with a County $ revision
fee) prior to calling in for inspection. Revisions take time, so please be prompt when
contacting us to ensure the project is not delayed.
Next, and I cannot stress this enough - DO NOT install the chambers DEEPER than the maximum
depth stated in the design - the depth is determined by factors that the design engineer cannot
control. This includes SATURATED/POOR SOIL CONDITIONS & COUNTY OWTS
CODE. Our designs give the widest range of depth possible for the specific site - if the required
depth cannot be met, other options may need to be explored.
If the soil treatment area is installed at a depth greater than allowed, there are very few solutions
to resolve the problem. Examples include:
o Removing all components and reinstalling them in a different location at correct depth.
o Backfilling trenches to an acceptable depth (using WASHED CONCRETE SAND
ONLY), installing a pump chamber, effluent pump, and pressurizing the system.
Please reach out at any time during the installation process if you have any questions - this office
has experienced several installations that have failed County inspections due to issues described
above - I would like to see every system PASS without comment as this makes everyone's job
easier.
Kr*irrlh. re &.116
/
Kachayla Cronk, P.E. - (970) 250-0572
flve (5) rows of elghteen (18) INFILfRATDR
OUICK4 STANDARD charnbens (or equlvolent)
for o totql of nlnety (90) unlts
x, 77' w/ endcaps, typ
of chornbens,
SOIL TREATMENT AREA - PLAN VIEV
(TYP. 3 EF 5)
SCALET 1'=10'
provlde inspectlon port o
eoch endcop qs shown
SCRE\4/ DETAIL
NTS
NITEr
CINTACT DESIGN ENGINEER AT
KACHAYLA,CRINKEt]UTLOOK,CEM
PRIDR Tt] INSTALL Tt] IBTAIN
ENTIRE IVTS DESIGN DOCUMENT
DRAVINGS MUST BE USEI] IN
CONJUNCTION VITH'PATTISIN
PRDJECT OVTS DESiGN' DATEI)
AUGUST 18, 2025
fosten odJocent chonbens w/
<3> 3/4' screws ot
opproxln'rotely 10 o'ctock, 12
o'ctock, ond 2 o'ctock posltlon,
tvp.
PATTISON PR[JECT
-TBD- CR 223
?t77-0t?-00-54?
SBIL TREATMENT AREA-PLAN ViEV
AUGUST 18, 2025
SCALET 1'=10'
GRAPHIC SHEET 3 t]F 4
I
I
I
I
ci
+
\o(')
t48'l
f*'o'l
o
\screws, typ,(see detolt)
o1'
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0Ji6c
JPEEo+3t
b
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tor
c
-K-CRONKt-l@+ql,ha|l-_T_
exlsting
gnound
surfoce
w/ slope
lnpllvi{ugt_ !=qchqs_ rlug! bS lele_l _
otong entlne tengtht trenches o,re
Inflttnqtor Qulck4 Stqndord
chqnbens, on equlvotent
SI]IL TREATMENT AREA - CROSS SECTII]N
(TYPICAL 3 OF 5)
SCALET 1'-5'
, ELEVATItrN TESIGN SPECIFICATIONS
DESIGN DISTANCE FREM FDUNDATIEN LINE TO INLET [F SEPTIC TANK = 10.
DESIGN DISTANCE FROM EUTLET OF SEPTIC TANK TE STA = 20.
ASSUMED ELEVATIEN 0F GR0UND SURFACE AT ENTRY T0 STA = 100'00'
ELEVATIEN OF BETT0M [F CHAMBERS AT ENTRY TO STA = 98.00'
INVERT ELEVATIIN [F SEVAGE LINE AT ENTRY DF DIST. BEX = 98.58,
INVERT ELEVATIIN [F SEVAGE LINE AT OUTLET EF SEPTiC TANK = 98,78,
INVERT ELEVATIEN EF SEVAGE LINE AT INLET OF SEPTIC TANK = 99.03,
INVERT ELEVATIEN [F SEWAGE LINE AT FDUNDATIEN LINE = 99.23,
provlde lnspectlon pont
of eqch endcop os shown
provlde sondy loon
soll cqp (nound 5Z),
tvp,
non-woven,penrneobte
Fobnlc, typ.geotextlte
-30'
-84',
SEILS LI]G
(SEE NOTES)
NITEI
CINTACT DESIGN ENGINEER AT
KACHAYLA.CRINKEDUTLt]OK.COM
PRIIR TD INSTALL TD NBTAIN
ENTIRE NVTS DESIGN DI]CUMENT
DRA\T/INGS MUST BE USED IN
CONJUNCTIIN WITH'PATTISIN
PRNJECT I]WTS DESIGN' DATED
AUGUST 18, 2025
PATTIS[N PRIJECT
-TBD- CR 223
?r77-012-00-542
SIIL TREATMENT AREA - CROSS SECTION
AUGUST 18, 2025
SCALEI AS SHIVN
GRAPHIC SHEET 4 [F 4
4' nln,
10' recomnendednot nequlred to be Ieve( retqtive
to eo,ch other - equol dlstrlbutlon
ensuned by distnlbutlon box
NUTE'
IF CINSISTENT TRENCH DEPTH
CANNOT BE MAINTAINED, CHAMBERS
MAY BE INSTALLED LEVEL AT 24'
MIN. AND 36' MAX BCS
NITEr
SPEED LEVELERS SUCH AS TUF-TITE SL_4([R EOUIVALENT) MAY BE INSTALLED AS
NEEDED AT IUTLETS DF DISTRIBUTIDN BEX
TE ENSURE EOUAL DISTRIBUTIDN T[ EACH
TRENCH
eo,ch trench
OUTLETS AS REOUIRED
DISTRIBUTIEN BOX DETAIL
SCALE' I'=1'
typlcot chomber
cnoss sectlon
!*1
#2
SOILS LDG NETES
#1 SOIL TYPE 3, USDA - SANDY CLAY LOAM, GRANULAR, MODERATE
STRUCTURE
#2 SOIL TYPE 34, USDA - SANDY CLAY LOAM, MASSIVE, STRUCTURELESS
N[ GRI]UNDVATER [R EVIDENCE [F PERII]DICALLY SATURATED SIILS
OBSERVED TE A DEPTH NF 84' BELIV GRI]UND SURFACE (BGS)
INLET)
CI]MPACTED NATIVE SIIL [R STRUCTURAL
FILL T[ PREVENT
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