HomeMy WebLinkAboutEngineer's OWTS DesignIED Huddleston-Berry
Engineering &Testing, LLC
Joe Reider
1620 County Road 21
Brighton, Colorado 80603
Subject: OWTS Design
Parcel 24072300004
Parachute, Colorado
2789 Riverside Parkway
Grand Junction, Colorado 81501
Phone: 970-255-8005
Info huddlestonberry.com
August 27, 2024
Project#02850-0001
Reference: Geotechnical Investigation, Parcel 24072300004, Parachute, Colorado by
Huddleston-Berry Engineering & Testing, LLC for Joe Reider, June 7, 2024.
Dear Mr_ Reider,
At your request, Huddleston-Berry Engineering & Testing, LLC completed design of an Onsite
Wastewater Treatment System (OWTS) for a single-family residence at Parcel 24072300004 in
Parachute, 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 investigated area was open. The northwest portion of the site
was fairly flat, and vegetation primarily consisted of grasses and weeds. The center and southeast
portions of the site contained moderate to steep slopes down to the adjacent canyon, and
vegetation consisted of grasses, weeds, and trees. Site topography is shown on Figure 2.
Vegetation consisted primarily of weeds and grasses. The site was bordered to the north by a
vacant lot and a rural residential property, to the west and south by rural residential properties,
and to the east 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 1.0 foot of topsoil above
reddish -tan to brown, moist, medium dense silt loam to silt loam with gravel soils with a
moderate granular structure that extended to the bottoms of the borings and excavations. The
site soils are consistent with Soil Type 2 with less than 35% rock.
Groundwater was not encountered in the subsurface at the time of the investigation. In general,
based upon the results of the subsurface investigation, MET believes that the seasonal high
groundwater elevation is deeper than 8.0 feet below the existing grade at this site.
The locations of the borings and test pits are shown on Figure 2. Copies of the boring and test
pit logs are included in Appendix A.
Parcel 240702300004
#02850-0001
08/27/24
Onsite Wastewater Treatment System
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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 June 2018. The proposed construction at the site is anticipated to
include a single bedroom home. However, Garfield County regulations that a minimum of two
bedrooms be considered per habitable structure. Therefore, the design will consider a two -
bedroom home.
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)
= 300 GPD
Soil Treatment Area = (300 GPD / 0.6) = 500 Square Feet
Adjusted Soil Treatment Area = (500 SF)(1.2)(0.7) = 420 Square Feet
# of Quick4 Chambers = (420 / 12) = 35 Chambers; Use 36 Chambers
System Installation
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 95% of the standard Proctor maximum dry density, within ±2% of
optimum moisture content. However, up to 3-inches of washed rock or pipe bedding
passing the 1-inch sieve may be used as a leveling course under the septic tank and/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 maximum dry density, within f2% 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 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.
V:12008 ALL PR0JECTS102850 - Joe Reidzrr%2850-000I Panel 2407023000041200 - Ce W2850-Ooai OWFS082724.doc 2
Parcel 240702300004
#02850-0001
08/27/24
8 Huddleston-Berry
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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
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Wayne D. Anderson, P.E.
Project Engineer
V:52006 ALL PROfECTS102050 - foe Reider102050-000I Parcel 240702300004\200 - Geo\0285MOOI OWTS062724.doc 3
�gPublic.net`" Garfield County, CO
Date created: 5/16/2024
Last Data Uploaded: 5/16120242:17:10AM
Developed by" Schneider
GE SPATIAL
FIGURE 1
Site Location Map
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APPENDIX A
Typed Boring & Test Pit Logs
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Huddleston-Berry Engineering & Testing LLC BORING NUMBER B-2
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2799 Riverside Parkway PAGE 1 OF 1
Grand Junction, CO 81501
s 970-255-8005
CLIENT Joe Reider PROJECT NAME Parcel 240702300004
PROJECT NUMBER 02B50-0001 PROJECT LOCATION Parachute, CO
DATE STARTED 5/20/24 COMPLETED 5/20/24 GROUND ELEVATION HOLE SIZE 4-Inch
MILLING CONTRACTOR S. McKracken GROUNDWATER LEVELS:
DRILLING METHOD Simco 2000 Truck Rig_ _ AT TIME OF DRILLING Dry
LOGGED BY TC CHECKED BY MAB AT ENDOF DRILLING Dry
NOTES AFTER DRILLING --
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= Grand Junclion, CO 81501
970-255-8005
CLIENT Joe Reider PROJECT NAME Parcel 240702300004
PROJECT NUMBER 02850-0001 PROJECT LOCATION Parachute, CO
DATE STARTED 5120124 COMPLETED 5120/24 GROUND ELEVATION TEST PIT SIZE
EXCAVATION CONTRACTOR Wiseland GROUND WATER LEVELS:
EXCAVATION METHOD TrackhlBackhoe AT TIME OF EXCAVATION Dry _
LOGGED BY TC CHECKED BY MAB AT END OF EXCAVATION Dry
NOTES AFTER EXCAVATION -
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970-255-8005
CLIENT Joe Reider PROJECT NAME Parcel 240702300004
PROJECT NUMBER 02850-0001 PROJECT LOCATION Parachute, CO
DATE STARTED 5/20124 COMPLETED 5120124 GROUND ELEVATION TEST PIT SIZE
EXCAVATION CONTRACTOR Wiseland GROUND WATER LEVELS:
EXCAVATION METHOD Trackh/Backhoe AT TIME OF EXCAVATION Dry
LOGGED BY TC CHECKED BY MAB AT END OF EXCAVATION Dry
NOTES AFTER EXCAVATION --
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