HomeMy WebLinkAboutEngineer's OWTS Design-RevisedHuddleston-Berry
Engileering & Testing, LLC
September 20,2024
Project#D2716-0002
LMartinez & Co.
1161 Munro Avenue
Rifle, Colorado 81650
Attention: Mr. Tyler Miles
Subject:OWTS Design
5322 County Road 243
New Castle, Colorado
Dear Mr. Miles,
At your request, Huddleston-Berry Engineering & Testing,LLC completed design of an Onsite
Wastewater Treatment System (OWTS) for 5322 County Road 243 in New Castle, Colorado.
HBET understands that a new single-family residence is proposed at the site. 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 area of the proposed residence was vegetated with brush and
trees. The building site was located on a small hill with slopes down to the west towards Main
Elk Creek. Site topography is shown on Figure 2.
Subsurface Investigation
In order to evaluate the subsurface conditions at the site, three test pits were excavated in the
vicinity of the Soil Treatment Area (STA). Using visual-tactile classification methods, the soil
profile consisted of brown, dry, structureless sandy loam with gravel and trace cobbles and
boulders to the bottoms of the excavations. The soils are consistent with Soil Type 2A.
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 than7.0 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.
2789 fuverside Parkway
Grand Junction, Colorado 81501
Phone: 970-255-8005
Info@huddlestonberry. com
5322 CR243
#027t6-0002
09120124
Onsite Wastewater Treatment Svstem
lluddls*on"Dnry
Eqlnrdi&ft$hl LLc
Seepage Bed Design
The design of the absorption system generally follows the requirements of the Garfield County
On-Site Wastewater Treatment System (OWTS) Regulations, effective June 2018. The proposed
construction at the site is anticipated to consist of a four bedroom home.
Based upon the visual/tactile soil classification, a Long-Term Acceptance Rate (LTAR) of 0.5
will be utilized for the absorption fibld 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.
Average Daily Flow: (7 persons)(75 GPD/person)
:525 GPD
Soil Treatment Area : (525 GPD / 0.5) : 11050 Square Feet
Adjusted Soil Treatment Area : (1,050 SFXl.2X0.7) : 882,Square Feet
# of Quick4 Chambers = (882 / I21:74 Chambersl Use 80 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:. 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 +2o/o of
optimum moisture content. Howevet, up to 3-inches of washed rock or pipe bedding
passing the l-inch sieve fnay 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 +2Yo of optimum moisture
content. Pipe bedding should have a maximum particle size of 1-inch.. Vehicular or heavy equipment traffic and placement of structurcs 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. Verif, proper fall between inverts.. Observe and verifu installation of the absorption bed prior to placement of cover and
backfill.
2Z:U008 ALL PROJDCTS\o2716 - J Ma.tinez and Co\027 l6{002 5322 Cotnty P.oad24},00 - Geo\0271 6-0002 OWTS 092024.doc
5322 CR243
#027t6-O002
09120124
In conformance with Garfield County regulations, HBET will be required to provide Garfield
County with documentation certi$ing 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 Submittedi
Huddleston-Berry Engineering and Testing, LLC
Michael A. Berry, P.E.
Vice President of Engineering
-'tZ:V008 ALL PROJECTS\02716 - J Martinez and Co\02716{002 5322 County Road 243V00 - Geo\027t64002 OWTS 092024.doc
s322 COUIITY ROAD 243
PARCEL# 192s26100067
FIGURE2-SITEPLAN
Huddleston trerry
Engfuecrtng & Tcsriog, LLC
2789 Riverside Parkway
Grand Junction, CO 81501
Project No.: 027 16-0002
Date: 09119124
By: MAB
['
uNtu*EEX\ I I
\
t(
N OVERALL SITE PLAN DETAIL AREA
+SCALE: l":100'SCALE: l":50'
I
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+I
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--l_\!. \i\. \"__l
C.I. :5 FT
A TEST PIT
rli
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DETAILED PLAN
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SCALE: l"=20'
6',N
DISTRIBUTION
THAT ENS1JRE E!'EN
DISTRIBUTION OF
EFFLUENT
TRATOR SYSTEMS QTJICK4
STANDARD CHAMBERS
4.INCH DIAMETER SEWER AND
EFFLUENTPIPE MEETING
D1785, SCHEDULE 40 OR SDR 35 20'!IIN
SEPTIC TANK
MINIMUM I,250
CALLON CAPACITY
WATER
**usE swEEP 90's oR
TWO 45'S AT 90
DEGREE BENDS**
5322 COLINTY ROAD 243
PARCEL# t92526t0'0067
FIGURE3-SEPTICSYSTEM
DETAILS
Huddleston-Berry
Engineering & Tesring; LLC
2789 Riverside Parkway
Project No.: 02'7 16-0002
Date: 09119124
By: MAB
GENERALIZED SYS TEM PROFILE
RESIDENTIAL
STRUCTURE
RISERS (AS NECESSARY)
THAT LIDS ARE AT OR
FINISHEI GRAI]E
INFiL CHAMBERS 1.0 Fr ilrN.
1.0 FT ilIN, COVER
AN EFFLUENT EST. 6,0
TE B,B FT
**3 BELOWBDXES
2 CEIIPARTMENT SEPTIC T FINISHED GRADE MAX**
FRDM CDPHE APPRBVEI] LIST
INSTALL EFFLUENT SC
IN DUTLET TEE
GENERALIZFD BED PROFILE
NOT TO
SCALE
T-------- --------lI FILTERBEDDIMENSIoNS=Two12'X40'BEDS I
I 4 ROWS OF IO QUICK4 STANDARD INFILTRATORS OR I
I ENGINEER APPROVED EQUAI- PERBED IL-----___ I
IMILTRATOR SYSTEMS QUICK4 COWR SOIL; NATWE SOILS oR OTHER SIJITABLE
TOPSOIL. GRADE TO CARRY SURFACE WATERSTANDARD
BED.
NONWOVEN, NEEDLE PUNCHED.**3 BELOW
FABRIC IMMEDIATELY ABOVE CHAMBERS FINISHED GRADE MAX**
MINIMUM SETBACKS
(UNITS: FT)
PRPERTY LINE
10
10
10
UNOCCUPIE!
!UL!ING
5
!VELLING
10
e0
LAKE, STREAM,
UNLINED DITCH
50
50
FLOODE!
FIEL!S
10
10
LINE! DITCH
10
10
10
)RY @LCH, CU'
BANK, AND FILL
10
25
!0
VAIER LINE
10
e5
10
vus
50
50
**OTIIER SETBACKS NOT LISTED HERE SHOULD BE IN ACCORDANCE WITH GARFIELD COUNTY OWTS R,EGULATIONS
Huddleston-Berry Engineering & Testing, LLC
2789 Riverside Parkway
Grand Junction, CO 81501
970-255-8005
PROJECT NAME 5322 Countv Road 243
PROJECT NUMBER 02716-0002 PROJECT LOCATION
CLIENT J. Martinez & Co.
TEST PIT NUMBER TP.1
PAGE 1 OF 1
GROUND WATER LEVELS:
AT TIME OF EXCAVATION
AT END OF EXCAVATION
AFTER EXCAVATION ---
TEST PIT SIZE
CHECKEDBY MAB drv
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COMPLETED 9/4/15 GROUND ELEVATION
NOTES
EXCAVATION GONTRAGTOR Client
EXCAVATION METHOD Trackh/Backhoe
LOGGEDBY MAB
DATE STARTED 914115
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