HomeMy WebLinkAboutEngineer's OWTS Design PlanHuddleston-Berry
Engíneering & Testlng, LLC
October 4,2023
Project#U271 6-0001
J.lNlafünez & Co.
1161 Munro Avenue
Rifle, Colorado 81650
Attention: Mr. James Martinez
Subject:OWTS Design
Parcel 217535400193
Garfield County, Colorado
Geotechnical Investigation, Pqrcel 217535400193, Garfield County, Coloradoby
Huddleston-Berry Engineering & Testing, LLC for J. Martinez &, Co., September
12,2023.
Reference
2789 Riverside Parkway
Grand Junction, Colorado 81501
Phone: 970-255-8005
Info@huddlestonberry.com
Dear Mr. Martinez,
At your request, Huddleston-Berry Engineering & Testing, LLC completed design of an Onsite
Wastewater Treatment System (OWTS) for a single-family residence at Parcel 217535400193 in
Garfield County, Colorado. The site location is shown on Figure 1 - Site Location Map. A site
plan is included as Figure 2.
Site Description
At the time of the investigation, the site was open with undulating tercain. However, the
topography in the vicinity of the investigated area was sloping down towards the north. Site
topography is shown on Figure 2. Vegetation consisted of weeds, grasses, bushes, and trees.
The site was bordered to the north and west by a large agricultural/residential property, to the
south and east by vacant parcels.
Subsurface Investigation
As discussed in the referenced report, the subsurface conditions at the site were fairly consistent.
Using visual-tactile classification methods, the soil profile consisted of 1.0 foot of topsoil above
tan, moist, medium stiff to stiff sandy loam soils with some gravels, cobbles, and boulders
(<35% rock) to the bottoms of the excavations. The site soils are consistent with Soil Type 24.
Groundwater was not encountered in the subsurface at the time of the investigation. In general,
based upon the results of the subsurface investigation, HBET believes that the seasonal high
groundwater elevation is deeper than 8.0 feet below the existing grade at this site.
The locations of the test pits are shown on Figure 2. Copies of the test pit logs are included in
Appendix A.
Parcel 217 535400193
#027t6-0001
t0104123
Onsite Wastewater Treatment System
lluddleston.Bcrry
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Seepage Bed Design
The design of the absorption system generally follows the requirements of Garfield County and
State of Colorado regulations. The proposed construction at the site is anticipated to include a
four-bedroom home.
Based upon the visual tactile classification of the soils, 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: (7 persons)(75 GPD/person)
:525 GPD
Soil Treatment Area : (525 GPD / 0.5) : 1,050 Square Feet
Adjusted Soil Treatment Area : (1,050 SFXl.2X0.7):882 Square tr'eet
# of Quick4 Chambers : (882 / 12):74 Chambers; Use 76 Chambers
System Instøllatìon
The installation of the septic tank, plumbing lines, Infiltrators, etc. should be completed in
accordance with Garfield County 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 12 inches, moisture conditioned, and recompacted to
a minimum of 95o/o of the standard Proctor maximum dry density, within L2%o of
optimum moisture content. However, up to 3-inches of washed rock or pipe bedding
passing the l-inch sieve may be used as a leveling course under the septic tank andlor
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 maximum dry density, within +2o/o of optimum moisture
content. Pipe bedding should have a maximum particle size of 1-inch.. Vehicular or heavy equipment 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 lnfiltrator chambers.. Observe placement of the septic tank, distribution box, and all connecting sewer and
effluent lines prior to backfill. Verif' proper fall between inverts.. Observe and verifu installation of the absorption bed prior to placement of cover and
backfill.
22:\2008 AI"L PROJECTS\02716 -J Martinez ând Co\02716{001 - Parcel 217535400193U00 - Geo\02716-000t LRl00423.doc
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In conformance with Garfield County regulations, HBET will be required to provide Garfield
County with documentation certifuing 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
Michael A. Berry, P.E.
Vice President of Engineering
32:\2008ALLPROJECTS\o271ó-JMôrti[czåndCo\027164001-lurecl2l7535400l93\200 Coú\027160001LR10012].doc
FIGURES
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FIGURE2-SITEPLAN
Huddleston-Besy
Enginæriag & fc$iug, LLC
2789 fuverside Parkway
Grand Junctior¡ CO 81501
Project No.: 02716-0001
Date: 10/04123
By: MAB
OVERALL ENLARGED SITE PLAII
SITE /f---l
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SCALE: l":300'
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SYSTÊMS QUICK4
STANDARD CHAMBERS
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PARCEL# 217535400193
FIGURE3-SEPTICSYSTEM
DETAILS
Huúficstoü-Berry
Efg¡nær'úg & TeÊtirg, LLc
2789 Riverside Parkway
Grand.Junetioq CO 81 501
Project No.: 02716-0001
Date: 10104123
By: MAB
GEI{ERALLZED SYSTEM PROFILE
RESI¡ENTIAL
STRUCTURE
RISÊRS (AS NËCESSARY)
THAT LIDS ARE AT trR
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INFIL CHA|43ÊRS t,o FT MtN. cnvER
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GENERALTZED BED PROFILE
NOT fO
SCALE
INFILTRATOR SYSTEMS QUICK4 COVER SOIL; NATwE SOILS OR OTHER SUITÀBLE
TOPSOIL. GF.ADE TO CARRY SURFACE WATERSTANDARD
BED.
NEEDLE PL]NCHED,
FABRIC IMMEDIATELY ABO!'E CHAMBERS
MINIMUM SETBACKS
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PROPÊRIY LINE
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APPEI{DIX A
Typed Test Pit Logs
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