HomeMy WebLinkAboutEngineer's Design PlanHuddleston-Berry
Engineering & Tssting, LLCI
August 26,2024
Projecf#02890-0001
Reeves & Sons Electric
1560 Main Street
Silt, Colorado 81652
Attention: Mr. Andrew Reeves
OWTS Design
111 W. Main Street
Silt, Colorado
Dear Mr. Reeves,
At your request, Huddleston-Ben)' Engineering & Testing, LLC completed design of an Onsite
Wastewater Treatment System (OWTS) for 111 W. Main Street in Silt, Colorado. HBET
understands that a new commercial building is proposed at the site. The site location is shown
on Figure I - Site Location Map. A site plan is included as Figure 2.
Site Descrintion
At the time of the investigation, an existing residence occupied the eastern portion of the site.
The remainder of the site was open. The site sloped generally gently down to the east. Site
topography is shown on Figure 2. Vegetation consisted primarily of grasses and weeds with a
few trees. The site was bordered to the north by Main Street, to the south by railroad tracks, to
the west by an existing commercial property, and to the east by a vacant lot.
Subsurface Investisation
In order to evaluate the subsurface conditions at the site, two pits were excavated in the vicinity
of the Soil Treatment Area (STA). Using visualtactile classification methods, the soil profile
consisted of tan, moist, medium stiff, structureless sandy loam (Soil Type 2A) to the bottoms of
the excavations.
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 9.0 feet below the existing grade at this site.
2789 Riverside Parkway
Grand Junction, Colorado 81501
Phone: 970-255-8005
Info@hudd lestonbeny. com
Subject:
The locations of the test pits are shown on Figure 2. Copies of the test pit logs are included in
Appendix A.
lll W, Main St.
#02890-0001
08/26124
Onsite Wastewater Treatment Svstem
Huddleston-Berry
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Seepage Bed Deslgn
The design of the absorption system generally follows the requirements of the Garfield County
On-Site Wastewater Treatment System (OWf\ Regulations, effective June 2018. Based upon
infonlation provided, HBET understands that the new commercial structure will serve six
employees for one shift/day with no showers.
Based upon the visualltactile soil classificationo a Long-Term Acceptance Rate (LTAR) of 0.5
will be utilized for the absorption field design. 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.
Averege Daily Flow: (6 persons)(2O GPD/person)
- 120 GPD
Soil Treatment Area = (120 CPD / 0.5) = 240 Squnre Feet
Adjusted Soil Treatment Area : (240 SFXl.2X0.7):202 Square Feet
# of Quick4 Chambers : (202 I 121:17 Chambersl Use 18 Chambers
System Installation
The installation of the septic tank, plumbing lines, Infiltrators, etc, should be completed in
accordance with the Garfield County regulations and Infiltrator Systems, Inc. specifications. In
addition, the following construction procedures are recommended:r 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 *2Yo of
optimum moisture content. However, up to 3-inches of washed rock or pipe bedding
passing the f -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 t2o/o 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 septio 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. Veriff proper fall between inverts.. Observe and veriff installation of the absorption bed prior to placement of cover and
backfill.
2Z:'2008 ALL PROJECTS\02,990 - Reeves ohd Sons Electrici02S90-000 I I I I W Moin Street 20O - Geo 02890-000 I OWTS0826t4,doc
l l l W. Main St.
#02890-0001
08126124
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In conformance with Garfield County regulations, HBET will be required to provide Garfield
County with documentation certifi/ing that the OWTS was placed in conformance to the plan and
profile and Garfield County regulations.
General Ngtes
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 Engineerlng and Testingo LLC
Michael A, Berry, P.E.
Vice President of Engineering
3
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FIGURES
t-
Locatlon
e€Hi
CACI'
Hffi
trffiffi
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OYERALL SITE PLAN
SCALE: 1'r:301
C.I. = I FT
A TESTPIT
+
I
ProjectNo.: 02890-0001
Date: 08/26124
By: MAB @ lluddloston Bcrry
Iiilghwrirg& IcsriuB, LLC
2789 Rivercido Parkway
CnndJunction,CO 81501
1I I lV. MAIN STRTET
PARCEL# 2r79091000t2
FIGURS2.SITEPLAN
GENERALIZED SYSTEM PROFILE
COilHERCIAL
STNUCTURE
RISERS (AS NECESSARY)
INFiL CHATBERS IO FI HIN
Egx rr4 8[LOW
h*ISHS OMDE MAX"
ER
l0s
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SCALE
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MINIMUM SETBACKS
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SCALE: l" - 20'
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SSPTICTANK VITH
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NHLIR1\TOR
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Project No.r 02890-0001
DEte: 08n6/24
By: MAB
lluddleston Beny
Englrcrht & I'c!rhg, LLC
2789
lII W. MAIN STREET
PARCEL# 2r7e0el000l2
FIGI'RE 3 - SEPTIC SYSTEM
DETAILS
APPENDIX A
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