HomeMy WebLinkAboutEngineer's OWTS Design PlanHuddleston-Berry
Engineering & Testing, LLC
October I8,2024
Project#02038-001 1
MIB Construction
789 25 Road
Grand Junction, Colorado 81505
Attention: Mr. Micah Berg
Reference:
OWTS Design
Parcel 217534300219
Rulison, Colorado
Geotechnical Investigation, Parcel 217534300219, Rulison, Colorado by
Huddleston-8e.ry Engineering & Testing,LLC for Micah Berg, June 6,2024.
2789 fuverside Parkway
Grand Junction, Colorado 81501
Phone: 970-255-8005
Info@huddlestonberry. com
Subject:
Dear Mr. Berg,
At your request, Huddleston-Berry Engineering & Testing,LLC completed design of an Onsite
Wastewater Treatment System (OWTS) for a single-family residence at Parcel 217534300219 in
Rulison, 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, the eastern portion of the site was occupied by an active natural
gas well. The remainder of the site was open and contained slight to moderate slopes down to the
north, east, and south, away from the investigated area. Site topography is shown on Figure 2.
Vegetation consisted of grasses, weeds, brush, and trees. The site was bordered to the north,
west, and east by rural residential properties, and to the south by federal land.
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 0.5 feet of topsoil above
tan to brown, moist, medium dense silt loam to silt loam with trace gravel and cobble soils with a
moderate granular strucfure to the bottoms of the excavations. The site soils are consistent with
Soil Type 2 with less than 35o/o rock.
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 below 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 217534300219
#02038-001 I
toltS/24
Onsite Wastewater Treatment Svstem
Huddleston-Berry
anehecrlr!& T.nlrg, LLc
Seepage Bed Design
The design of the absorption system generally follows the requirements of the Garfield County
Department of Public Works as outlined in the Garfield County On-Site Wastewater Treatment
System Regulations, effective July 2018. The proposed construction at the site is anticipated to
include a single bedroom home. However, the proposed construction includes an office with a
closet. In addition, Garfield County regulations require that a minimum to two bedrooms be
considered per habitable structure. Therefore, the design will consider two bedrooms.
Based upon the visual tactile classification of the soils, a Long-Term Acceptance Rate (LTAR)
of 0.6 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: (4 persons)(75 GPD/person)
:3OO GPI)
Soil Treatment Area: (300 GPD / 0.6): 500 Square Feet
Adjusted Soil Treatment Area : (500 SFXl.2X0.7): 420 Square Feet
# of Quick4 Chambers: (420 / 12):35 Chambersl Use 36 Chambers
System Installution
The installation of the septic tank, plumbing lines, Infiltrators, etc. should be completed in
accordance with the Garfield County On-Site Wastewater 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 12 inches, moisture conditioned, and recompacted to
a minimum of 95Yo of the standard Proctor maximum dry density, within +2Yo 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 +2Yo of optimum moisture
content. Pipe bedding should have a maximum particle size of l-inch.. Vehicular or heavy equipment traffic and placement of structures should not encroach
within 10 feet of the septic tank or distribution box.
fnspection Schedule
Huddleston-Berry Engineering & Testing LLC should be retained to monitor the construction of
the OWTS. The following schedule of observation andlor 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. Veri$' proper fall between inverts.
V:U008 ALL PROJECTS\02038 - MIB\02038-001 I Parcel 2 I 75341002 19U00 - ceo\02038401 I OWTSI 0l724.doc 2
Huddleston-Berry
Bnqireinr& Te$lng, ILC
. Observe and veriff 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 certiSring 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
Wayne D. Anderson, P.E.
Project Engineer
Parcel 277 534300219
#02038-001 I
l0lt8l24
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aJV:U008 ALL PROIBCTS\02038 - MIB\02038-001 I Parcel 217534300219\200 - Geo\02038-0011 OWTSl0l?24.doc
FIGURES
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FIGURE 1
Site Location MapDate ueated: 5/10/2024
Last Data Uploacled: 5/10/2024 2:43:37 AM
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Hudilleston-Berry
Engineqing & Tcsting, LLC
2789 Riverside Parkway
GrandJunction, CO 8150
PARCEL#217s343002r9
FIGURE2-SITEPLAN
Project No.: 02038-001 I
Date: l0/L8124
By: WDA
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SITE PLAN ENLARGED VIEW
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PARCEL#217534300219
FIGIIRE 3 - SEPTIC SYSTEM
DETAILS
Huddleston-Berry
Engineering & Teting, LLC
2789 Riverside Parkway
Grand Junction, CO 81501
Project No.: 02038-001 1
Date; l0ll8l24
By: WDA
GENERALTZED SYS TEM PROF'ILE
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