HomeMy WebLinkAboutEngineer's Design PlanHuddleston-Berry
Engineering & Testing, LLC
Monico Murillo
250 County Road 127 #2
Glenwood Springs, Colorado 81601
2789 Riverside Parkrval'
Crand Junction. Colorado 8 1 50 I
Phone: 970-255-8005
Inlo@huddlestonberry.com
September 26,2023
Project#0263 I -000 I
Subject:
Reference
OWTS Design
Parcel 212728100386
Garfi eld County, Colorado
Geotechnical Investigation, Parcel 212728100386, Garfield County, Colorado by
Huddleston-Berry Engineering & Testing, LLC for Monico Murillo, May 2,2023.
Dear Mr. Murillo,
At your request, Huddleston-Berry Engineering & Testing, LLC completed design of an Onsite
Wastewater Treatment System (OWTS) for a single-family residence at Parcel 212728100386 in
Garfield County, Colorado. The site location is shown on Figure I - Site Location Map. A site
plan is included as Figure 2.
Site Description
At the time of the investigation, an existing barn occupied the eastern portion of the investigated
area. The remainder of the site was open and sloping down towards the west. Site topography is
shown on Figure 2. Vegetation consisted of weeds, grasses, brush, bushes, and trees. The site
was bordered to the north, south, west, and east by large vacant parcels.
Subsu rface Investiqation
As discussed in the referenced report, the subsurface conditions at the site were fairly consistent.
Based upon visual-tactile soil classification methods, the soil profile consisted of 1.0 to 1.5 feet
of topsoil above tan to brown, moist, loose to dense sandy loam soils to the bottoms of the
excavations. A large boulder was encoLlntered at a depth of 6.0 feet in TP-3. Groundwater was
not encountered at the time of the investigation.
The locations of the test pits are shown on Figure 2. Copies of the test pit logs are included in
Appendix A.
Onsite Wastewater Treatment System
In order to evaluate the site soils for onsite wastewater treatment, percolation testing was
conducted at the site in accordance with Garfield County regulations. The percolation rate in the
native soils ranged from 9 to 30 minutes-per-inch. The percolation testing data are included in
Appendix B.
Parcel 21278100386
#0263 l -000 r
09t26/23
Illddleston-Berry
Engin.ctug&Icsin8, LLC
In accordance with Garfield Cor-rnty regLrlations, a percolation rate of between 5 to 60 minlrtes-
per-inch is required for soils to be deemed suitable for onsite wastewater treatment. Therefore.
based upon the results of the percolation testing. HBET believes that the native soils are suitable
for onsite wastewater treatment.
In addition to the percolation rate of the subsr-rrface materials, the seasonal high groundwater
elevation is an imporlant factor in determining the suitability of the site for Onsite Wastewater
Treatment Systems. For OWTS suitability, the seasonal high groundwater elevation should be at
least four feet below the bottom of the proposed absorption bed. As discussed previously,
groundwater was not encountered at the tirne of the investigation. In general, based upon the
results of the subsurface investigations, HBET believes thatthe seasonal high groundwater level
is deeper than 10.0 feet'below the existing grade at this site.
Seepage Bed Design
The design of the absorption system generally follows the requirements of the Garfield County
Department of Public Works as or,rtlined in the Garfield County On-Site Wastewater Treatment
System Regulations, effective June 2018. The proposed construction at the site is anticipated to
include a five-bedroom home.
Based upon the soil percolation rate and visual-tactile classification, a Long-Term Acceptance
Rate (LTAR) of 0.5 will be utilized for the absorption field design. Infiltrator Systems Quick4
Standard Chambers are proposed. The daily flow of the sewage disposal system is calculated
below and a plan and profile of the absorption system are shown on Figure 3.
Average Daily Flow: (8 persons)(75 GPD/person)
:600 GPD
Soil Treatment Area: (600 GPD / 0.5;: 1,200 Square Feet
Adjusted Soil Treatment Area: (1,200 SFXl.2X0.7): 1,008 Square Feet
# of Quick4 Chambers : ( I ,008 I 121 :84 Chambers
System Instullation
The installation of the septic tank, plumbing lines, Infiltrators, etc. should be completed in
accordance with the Garfield County On-Site llastewater Treatment System Regulations and
Infiltrator Systems, Inc. specifications. In addition, the following construction procedures are
recommended:. The septic tank and distribution box should be placed level over native soils that have
been scarified to a depth of 8 to l2 inches, moisture conditioned, and recompacted to
a minimum of 95Yo of the standard Proctor maximum dry density, within +2o/o of
optimum moisture content. However, up to 3-inches of washed rock or pipe bedding
passingthe l-inch sieve may be used as a leveling course underthe septic tankand/or
distribution box.
' The bottoms of trenches and backfill around the septic tank and distribution box
which will support sewer or effluent lines should be compacted to at least 90 percent
of the standard Proctor maxirnum dry density, within +2%o of optimum moisture
content. Pipe bedding should have a maximum particle size of I -inch.
Z:003ALl,PROJE('TSr0l6ll-llonico\lurrllo\026-ll'000lPaLcel:ll7lsl00lSo,l00-Ceo0l6il-000lLR09l6l-ldoc 2
Parcel 21278100386
#0263 l -000 r
09/26123
Iluddleston-Berry
Enairaing&T$dnE, LLc
Vehicular or heavy eqLripment traffic and placement of structures should not encroach
within 10 feet of the septic tank or distribution box.
Inspection Schedule
Huddleston-Berry Engineering & Testing LLC should be retained to monitor the construction of
the OWTS. The following schedule of observation and/or testing should be followed:. Observe the absorption bed excavation prior to placement of Infiltrator chambers.. Observe placement of the septic tank, distribution box, and all connecting sewer and
effluent lines prior to backfill. Verify proper fall between inverts.. Observe and verify installation of the absorption bed prior to placement of cover and
backfill.
In conformance with Garfield County regulations, HBET will be required to provide the Garfield
County Health Department with documentation certifying that the OWTS was placed in
conformance to the plan and profile and Garfield County regulations.
General Notes
The OWTS design was based upon the results of the subsurface investigation and on our local
experience. The design is valid only for the proposed construction.
We are pleased to be of service to your project. Please contact us if you have any questions or
comments regarding the contents of this report.
Respectfully Submitted:
Huddleston-Berry Engineering and Testing, LLC
MichaelA. Berry, P.E.
Vice President of Engineering
Z \ 2008 ALt. PROJ ECTS\026j I - trlonico !l uril l0\016i I -000 I Parc.'l I I l713 I 001 36,100 - Ceo 0:b i I -000 I LR0ql6lj doc J
FIGURES
G)qPublic.net''' Garfie ld County, CO
Date created: 3/3O/2023
Last Data Uploaded;3/30/2023 2:39:58 AM
FIGURE 1
Site Location Map
D e ve ro pe d tt Ct 9Flrgl""idF[
APPENDIX A
Typed Test Pit Logs
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I-[uddleston-Berry Engineering & Testing. LLC
2789 Riverside Parkrvav
Grand .lunction. CO 8 t 50 I
970-255-8005
TEST PIT NUMBER TP.z
PAGE 1 OF 1
CLIENT Monico Murillo PROJECT NAME Parcel 212728100386
PROJECT NUMBER 02631-OOO1 PROJECT LOCATION Garfield County, CO
DATE STARTED 3131123 COMPLETED 3/31/23 GROUND ELEVATION TEST PIT SIZE
EXCAVATION CONTMCTOR C|ieni GROUND WATER LEVELS:
AT TIME OF EXCAVATION
AT END OF EXCAVATION
AFTER EXCAVATION ---
EXCAVATION METHOD
LOGGED BY TEC
Trackh/Backhoe Dry
CHECKED BY MAB Drv
NOTES
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APPENDIX B
Percolation Testing Results
PERCOLATION TESTING
STP322Iluddleston-Berry
Etrgilrrcri[g.( Tcitiig, LI-C
Project Name: Parcel 212728100386 Location: Garfield County, CO
Testing Conducted By:
Supervising Engineer:
TEST PIT DIMENSIONS
SOIL PROFILE
T. Collins
M. Be
o.
TP.3
313112023
Test Pit No.
Date:
Water Level Depth (ft)Length
(ft)
width
(ft)
Depth
(ft)Depth (ft)Not Encountered
8.0 XI
Depth (ft)Description Remarks
0-1 Sandv Loam with Orqanics (TOPSOIL)
1-8
Sandy Loam, tan to brown, moist, medium dense to dense, weak
qranular structure
Test Number: 1
Top of Hole Depth: e tttl
Diameter of Hole: 3 (in)
Depth of Hole: 18 (in)
Time
(min.)
Water
Depth
fin.)
Change
(in.)
0 1.625
10 2.125 0.5
20 2.375 o.25
30 2.875 0.5
40 3.375 0.5
50 3.625 0.25
60 4.'t25 0.5
70 4.375 o.25
80 4.625 0.25
90 4.875 0.25
100 5.375 0.5
110 5.625 0.25
120 5.875 o.25
30 Rate (min/in):Rate (min/in)
20
Test Number: 1
Top of Hole Depth: S ftl
Diameter of Hole: 3 (in)
Depth of Hole: 17 (in)
Test Number:
Top of Hole Depth:
-
(ft)
Diameter of Hole: (in)
Depth of Hole: (in)
Time
(min.)
Water
Depth
(in.)
Change
(in.)
0 1.875
10 6.625 4.75
20 9.125 2.5
30 11.125 2
40 12.625 1.5
50 14j25 '1.5
60 15j25 I
7A 16.125 1
80 17j25 1
90 17.625 0.5
100 Drv
110 1
120 3 2
o
Time
(min.)
Water
Depth
(in.)
Change
(in.)
Average Percolation Rate (min/in)
Rate (min/in)
Project No.: 0263 1-0001
Date: 09/21123
By: MAB
Huddlest0n-Berry
Engineering & Testing, LLC
2 789 Riverside Parku'a,v
Grand Junction. CO 81501
PARCEL#212728100386
FIGURE2-SITEPLAN
NEW HOME
STA
,,
,
a
,,
WELL
,
WELL
TER LINE
__t
SITE PLAN ENLARGED VIEW tnF\Ri9<funr.ev ?la J
20' PRIVATE DRIVE AND
EMERGENCY ACCESS
EASEMENT
(
\
REPAIR AREA-'Y
\
A
TP-3
TP.1
TER LINE
1O'UTILITY EASEMENT
SCALE: l":40'
'-NOTE: TANK AND BEO LOCATIoNS APPROXIIVIATE AND l\,lAY SHIFT SOI\IE DURING
CONSTRUCTION BASED UPON SITE TOPOGRAPHY, OWNER PREFERENCE. AND/OR OTHER
FACTORS AS LONG AS APPLICABLE SETBACKS ARE MET. ACTUAT IOCATION OF TANK AND
BED WILt BE INDICATED ON AS.BUILT DRAWINGS,*
SCALE: l":200'
C.I. : 1 FT
A TEST PIT
NEW HOME
SEPTTC TANK(S)
WITH MINIMUM
1,500 GALLON
CAPACITY
POLE
N
t(
GENERALIZED SYSTEM PROFILE
NNT TO
SCALE
RESIDENTIAL
STRUCTURE
RISERS (AS NECESSARY)
UCH THAT LIDS ARE AT OR INFlLTRATER OUICK4
STANDARD CHAMBERSCLEUTVE FINISHED GRADE
1.0 FT MIN. CNVER
ON EFFLUENT EST 6,0T[ 8.0 FT EST, 2,0 FT
4,0 FT MAX,
1.0 FT MIN, CI]VER
DISTRIBUTIDN BOX
TIC TANK
GENERALI ZED BED PROFILE
NET TB
SCALE
COVER SOIL; NATIVE SOILS OR OTHER SU]TABLE
TOPSOIL. GRADE TO CARRY SURFACE WATER
AWAY FROM BED.
INFILTRATOR SYSTEMS QUICK4
STANDARD CHAMBERS
NON\A/OVEN. NEEDLE PUNCHED. GEOTEXTILE
FABRIC IMIVIED]ATEL\' ABOVE CHAMBERS
MINIMIJM SETBACKS
(UNITS: FT)
VELLS VJATER LINE ORY 6ULCH, CU]
BANK, AND FILL LINED DITCH FLEODED
FIELDS
LAKE, STREAM,
UNLINED DITCH DVELLING UNOCCUPIED
BUILDlNG PRT]PERTY LINE
SEPTIC TANK 50 10 10 10 t0 50 5 10
AA\URI- I lUN
BEI)100 e5 e5 10 a5 50 20 5 10
LT I. LULN I
I TNFS 50 10 10 10 10 50 10
ffic'(#
\7.MIN,O,5Z FALL MIN.
\NZ
'(r,\\
*xOTllER SETIIACKS NO'f l".lSTED IJEI{E SIJOUI-D IIE IN ACC'ORDANUE \\'11-11(;.ARFTIrl-D COUNTY O\\-TS ILEGLILATIONS
DETAIL AREA **USE S\\'EEP 9O'S OR
TWO 45',S AT 90
i]EGREE BENDSs"SCALE: l":20'
N
INSPECTION PORTS
INFILTRATOR SYSTEMS QUICK4
STANDARD C]JAMBERS
INSPECTION PORTS
DISTR]BUTION BOX
THAT ENSURES EVEN
DISTRIBUTION OF
EFFLUENT
MI
SEPTIC TANK WJTH
4-]NCH DIA]\,{ETER SEWER AND r\4lNIMUNI 1,500
EFFLUENT P]PE MEETING AS GA]-I-ON CAPAC]TY
Dr785. SCHEDULE40 OR SDRA
\ IATER LINE----\
NEW HOME
Project No.: 0263 1-0001
Date: 09126123
BY: MAB
Huddleston-Berry
Engineering & Testing, LLC
2789 Riverside Parku'ay
Grand Junction. CO 81501
PARCEL#212728I 00386
FIGURE3-SEPTICSYSTEM
DETAILS