HomeMy WebLinkAboutRevised-Engineer's Design Plan 10.04.2023 2789 Riverside Parkway
Grand Junction, Colorado 81501
Phone: 970-255-8005
Info@huddlestonberry.com
September 6, 2023
Project#00505-0027
Keystone Custom Builders, Inc.
PO Box 1807
Grand Junction, Colorado 81502
Attention: Mr. Jarred Eddy
Subject: OWTS Design
68 Wilson Lane
Rifle, Colorado
Reference: Geotechnical Investigation, 68 Wilson Lane, Rifle, Colorado by Huddleston-
Berry Engineering & Testing, LLC for Jarred Eddy, July 28, 2023.
Dear Mr. Eddy,
At your request, Huddleston-Berry Engineering & Testing, LLC completed design of an Onsite
Wastewater Treatment System (OWTS) for a new shop building at 68 Wilson Lane in Rifle,
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. However, a small garage structure was present
in the southeastern portion of the site. The site sloped moderately down to the north. Site
topography is shown on Figure 2. Vegetation consisted primarily of grasses. Vegetation
consisted primarily of grasses and weeds with a few trees. The site was bordered to the north by
E. 7th Street, to the west and south by open land, and to the east by an existing residence.
Subsurface Investigation
As discussed in the referenced report, the subsurface conditions at the site were the subsurface
conditions at the site were variable. However, Using visual-tactile classification methods, the
soil profile in most of the test pits consisted of 1.0 foot of topsoil above reddish tan, moist, soft to
medium stiff, structureless sandy loam soils (Soil Type 2A). The loam soils were underlain by
tan, moist, medium dense to dense sand with gravel and cobbles (<35% rock, Soil Type 1) 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 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.
68 Wilson Ln.
#00505-0027
10/04/23
Z:\2008 ALL PROJECTS\00505 - Keystone Custom\00505-0027 68 Wilson Lane\200 - Geo\00505-0027 LR100423.doc 2
Onsite Wastewater Treatment System
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 shop structure with a lavatory and kitchen sink.
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 = (1 lavatory)(8.4 GPD/lavatory)(1 person)+
(1 kitchen sink)(5.8 GPD/kitchen sink)(1 person)+
(1 travel trailer hookup)(50 GPD/travel trailer hookup)
= 65 GPD
Soil Treatment Area = (65 GPD / 0.5) = 130 Square Feet
Adjusted Soil Treatment Area = (130 SF)(1.0)(0.7) = 91 Square Feet
# of Quick4 Chambers = (91 / 12) = 8 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 ±2% 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.
68 Wilson Ln.
#00505-0027
10/04/23
Z:\2008 ALL PROJECTS\00505 - Keystone Custom\00505-0027 68 Wilson Lane\200 - Geo\00505-0027 LR100423.doc 3
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
Michael A. Berry, P.E.
Vice President of Engineering
10/04/23
FIGURES
Gar eld County, CO
Developed by
Account
Number
R210826
Parcel
Number
217710300022
Acres 2
Land SqFt 0
Tax Area 021
2019 Mill Levy 66.3370
Physical
Address
9 294 COUNTY RD
RIFLE 81650
Owner
Address
SCHMUESER, LARRY R II &
LORI J
68 WILSON LANE
RIFLE CO 81650
2019 Total Actual
Value
$129,000 Last 2 Sales
Date Price
5/23/2016 $44,000
n/a $
Date created: 7/11/2023
Last Data Uploaded: 7/11/2023 2:08:10 AM
826 ft
Overview
Legend
Parcels
Roads
Parcel/Account
Numbers
Owner Name
Lakes & Rivers
County Boundary
Line
TP-1 TP-2 TP-3
55
7
6
2789 Riverside Parkway
Grand Junction, CO 81501
Project No.: 00505-0027
Date: 09/06/23
By: MAB
68 WILSON LANE
PARCEL#217710300022
FIGURE 2 - SITE PLANTEST PIT
C.I. = 2 FT
SCALE: 1" = 40'
**NOTE: TANK AND BED LOCATIONS APPROXIMATE AND MAY SHIFT SOME DURING
CONSTRUCTION BASED UPON SITE TOPOGRAPHY, OWNER PREFERENCE, AND/OR OTHER
FACTORS AS LONG AS APPLICABLE SETBACKS ARE MET. ACTUAL LOCATION OF TANK AND
BED WILL BE INDICATED ON AS-BUILT DRAWINGS.**
TP-5
TP-4 5560
5570
5574 5572 5568 5566
5564
5562
5558
5556
~24'
(10' MIN)
~124'
~51'
60'
110'
~18'
~28'
~226'
~19'
~184'
~34'
~23'
5' MIN
3'
32'~144'
NEW SHOP
ANTICIPATED WATER LINE
REPAIR AREA
MINIMUM 500
GALLON TANK
STA
GRAVEL DRIVEWAY
EXISTING SHED
TP-6
10/04/23
2789 Riverside Parkway
Grand Junction, CO 81501
Project No.: 00505-0027
Date: 10/04/23
By: MAB
MINIMUM SETBACKS
(UNITS = FT)
**OTHER SETBACKS NOT LISTED HERE SHOULD BE IN ACCORDANCE WITH GARFIELD COUNTY OWTS REGULATIONS
**USE SWEEP 90'S OR
TWO 45'S AT 90
DEGREE BENDS**
DETAIL AREA
SCALE: 1" = 30'
68 WILSON LANE
PARCEL#217710300022
FIGURE 3 - SEPTIC SYSTEM
DETAILS
4-INCH DIAMETER SEWER AND
EFFLUENT PIPE MEETING ASTM
D1785, SCHEDULE 40 OR SDR 35
SEPTIC TANK WITH
MINIMUM 500
GALLON CAPACITY
ANTICIPATED WATER LINE
INFILTRATOR SYSTEMS QUICK4
STANDARD CHAMBERS
NEW SHOP
INSPECTION PORTS
GENERALIZED SYSTEM PROFILE
GENERALIZED BED PROFILE
COVER SOIL; NATIVE SOILS OR OTHER SUITABLE
TOPSOIL. GRADE TO CARRY SURFACE WATER
AWAY FROM BED.
NONWOVEN, NEEDLE PUNCHED, GEOTEXTILE
FABRIC IMMEDIATELY ABOVE CHAMBERS
INFILTRATOR SYSTEMS QUICK4
STANDARD CHAMBERS ~51'
5' MIN
3'
32'
10/04/23
APPENDIX A
Typed Test Pit Logs
Sandy Loam with Organics (TOPSOIL)
Sandy Loam, reddish tan, moist, soft to medium stiff, structureless
(Soil Type 2A)
Sand with Gravel and Cobbles (<35% Rock), tan, moist, medium
dense to dense, structureless (Soil Type 1)
Bottom of test pit at 8.0 feet.
MC
1 93 7
NOTES
GROUND ELEVATION
LOGGED BY TEC
EXCAVATION METHOD Trackh/Backhoe AT TIME OF EXCAVATION Dry
AT END OF EXCAVATION Dry
AFTER EXCAVATION ---
TEST PIT SIZE
EXCAVATION CONTRACTOR Wiseland GROUND WATER LEVELS:
CHECKED BY MAB
DATE STARTED 6/23/23 COMPLETED 6/23/23
DE
P
T
H
(f
t
)
0.0
2.5
5.0
7.5
GR
A
P
H
I
C
LO
G
ATTERBERG
LIMITS
MATERIAL DESCRIPTION
SA
M
P
L
E
T
Y
P
E
NU
M
B
E
R
FI
N
E
S
C
O
N
T
E
N
T
(%
)
RE
C
O
V
E
R
Y
%
(R
Q
D
)
BL
O
W
CO
U
N
T
S
(N
V
A
L
U
E
)
PO
C
K
E
T
P
E
N
.
(t
s
f
)
DR
Y
U
N
I
T
W
T
.
(p
c
f
)
MO
I
S
T
U
R
E
CO
N
T
E
N
T
(
%
)
LI
Q
U
I
D
LI
M
I
T
PL
A
S
T
I
C
LI
M
I
T
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PAGE 1 OF 1
TEST PIT NUMBER TP-1
CLIENT Keystone Custom Builders
PROJECT NUMBER 00505-0027
PROJECT NAME 68 Wilson Lane
PROJECT LOCATION Rifle, CO
GE
O
T
E
C
H
B
H
C
O
L
U
M
N
S
0
0
5
0
5
-
0
0
2
7
6
8
W
I
L
S
O
N
L
A
N
E
O
W
T
S
.
G
P
J
G
I
N
T
U
S
L
A
B
.
G
D
T
1
0
/
4
/
2
3
Huddleston-Berry Engineering & Testing, LLC
2789 Riverside Parkway
Grand Junction, CO 81501
970-255-8005
Sandy Loam with Organics (TOPSOIL)
Sandy Loam, reddish tan, moist, soft to medium stiff, structureless
(Soil Type 2A)
Sand with Gravel and Cobbles (<35% Rock), tan, moist, medium
dense to dense, structureless (Soil Type 1)
Bottom of test pit at 6.0 feet.
NOTES
GROUND ELEVATION
LOGGED BY TEC
EXCAVATION METHOD Trackh/Backhoe AT TIME OF EXCAVATION Dry
AT END OF EXCAVATION Dry
AFTER EXCAVATION ---
TEST PIT SIZE
EXCAVATION CONTRACTOR Wiseland GROUND WATER LEVELS:
CHECKED BY MAB
DATE STARTED 6/23/23 COMPLETED 6/23/23
DE
P
T
H
(f
t
)
0.0
2.5
5.0
GR
A
P
H
I
C
LO
G
ATTERBERG
LIMITS
MATERIAL DESCRIPTION
SA
M
P
L
E
T
Y
P
E
NU
M
B
E
R
FI
N
E
S
C
O
N
T
E
N
T
(%
)
RE
C
O
V
E
R
Y
%
(R
Q
D
)
BL
O
W
CO
U
N
T
S
(N
V
A
L
U
E
)
PO
C
K
E
T
P
E
N
.
(t
s
f
)
DR
Y
U
N
I
T
W
T
.
(p
c
f
)
MO
I
S
T
U
R
E
CO
N
T
E
N
T
(
%
)
LI
Q
U
I
D
LI
M
I
T
PL
A
S
T
I
C
LI
M
I
T
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PAGE 1 OF 1
TEST PIT NUMBER TP-2
CLIENT Keystone Custom Builders
PROJECT NUMBER 00505-0027
PROJECT NAME 68 Wilson Lane
PROJECT LOCATION Rifle, CO
GE
O
T
E
C
H
B
H
C
O
L
U
M
N
S
0
0
5
0
5
-
0
0
2
7
6
8
W
I
L
S
O
N
L
A
N
E
O
W
T
S
.
G
P
J
G
I
N
T
U
S
L
A
B
.
G
D
T
1
0
/
4
/
2
3
Huddleston-Berry Engineering & Testing, LLC
2789 Riverside Parkway
Grand Junction, CO 81501
970-255-8005
Sandy Loam with Organics (TOPSOIL)
Sandy Loam, reddish tan, moist, soft to medium stiff, structureless
(Soil Type 2A)
Sand with Gravel and Cobbles (<35% Rock), tan, moist, medium
dense to dense, structureless (Soil Type 1)
Bottom of test pit at 6.0 feet.
NOTES
GROUND ELEVATION
LOGGED BY TEC
EXCAVATION METHOD Trackh/Backhoe AT TIME OF EXCAVATION Dry
AT END OF EXCAVATION Dry
AFTER EXCAVATION ---
TEST PIT SIZE
EXCAVATION CONTRACTOR Wiseland GROUND WATER LEVELS:
CHECKED BY MAB
DATE STARTED 6/23/23 COMPLETED 6/23/23
DE
P
T
H
(f
t
)
0.0
2.5
5.0
GR
A
P
H
I
C
LO
G
ATTERBERG
LIMITS
MATERIAL DESCRIPTION
SA
M
P
L
E
T
Y
P
E
NU
M
B
E
R
FI
N
E
S
C
O
N
T
E
N
T
(%
)
RE
C
O
V
E
R
Y
%
(R
Q
D
)
BL
O
W
CO
U
N
T
S
(N
V
A
L
U
E
)
PO
C
K
E
T
P
E
N
.
(t
s
f
)
DR
Y
U
N
I
T
W
T
.
(p
c
f
)
MO
I
S
T
U
R
E
CO
N
T
E
N
T
(
%
)
LI
Q
U
I
D
LI
M
I
T
PL
A
S
T
I
C
LI
M
I
T
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PAGE 1 OF 1
TEST PIT NUMBER TP-3
CLIENT Keystone Custom Builders
PROJECT NUMBER 00505-0027
PROJECT NAME 68 Wilson Lane
PROJECT LOCATION Rifle, CO
GE
O
T
E
C
H
B
H
C
O
L
U
M
N
S
0
0
5
0
5
-
0
0
2
7
6
8
W
I
L
S
O
N
L
A
N
E
O
W
T
S
.
G
P
J
G
I
N
T
U
S
L
A
B
.
G
D
T
1
0
/
4
/
2
3
Huddleston-Berry Engineering & Testing, LLC
2789 Riverside Parkway
Grand Junction, CO 81501
970-255-8005
Sandy Loam with Organics (TOPSOIL)
Sandy Loam, reddish tan, moist, soft to medium stiff, structureless
(Soil Type 2A)
Sand with Gravel and Cobbles (<35% Rock), tan, moist, medium
dense to dense, structureless (Soil Type 1)
Bottom of test pit at 8.0 feet.
GB
1 80432171515
NOTES
GROUND ELEVATION
LOGGED BY TEC
EXCAVATION METHOD Trackh/Backhoe AT TIME OF EXCAVATION Dry
AT END OF EXCAVATION Dry
AFTER EXCAVATION ---
TEST PIT SIZE
EXCAVATION CONTRACTOR Wiseland GROUND WATER LEVELS:
CHECKED BY MAB
DATE STARTED 6/23/23 COMPLETED 6/23/23
DE
P
T
H
(f
t
)
0.0
2.5
5.0
7.5
GR
A
P
H
I
C
LO
G
ATTERBERG
LIMITS
MATERIAL DESCRIPTION
SA
M
P
L
E
T
Y
P
E
NU
M
B
E
R
FI
N
E
S
C
O
N
T
E
N
T
(%
)
RE
C
O
V
E
R
Y
%
(R
Q
D
)
BL
O
W
CO
U
N
T
S
(N
V
A
L
U
E
)
PO
C
K
E
T
P
E
N
.
(t
s
f
)
DR
Y
U
N
I
T
W
T
.
(p
c
f
)
MO
I
S
T
U
R
E
CO
N
T
E
N
T
(
%
)
LI
Q
U
I
D
LI
M
I
T
PL
A
S
T
I
C
LI
M
I
T
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PAGE 1 OF 1
TEST PIT NUMBER TP-4
CLIENT Keystone Custom Builders
PROJECT NUMBER 00505-0027
PROJECT NAME 68 Wilson Lane
PROJECT LOCATION Rifle, CO
GE
O
T
E
C
H
B
H
C
O
L
U
M
N
S
0
0
5
0
5
-
0
0
2
7
6
8
W
I
L
S
O
N
L
A
N
E
O
W
T
S
.
G
P
J
G
I
N
T
U
S
L
A
B
.
G
D
T
1
0
/
4
/
2
3
Huddleston-Berry Engineering & Testing, LLC
2789 Riverside Parkway
Grand Junction, CO 81501
970-255-8005
Sandy Loam with Gravel, and Cobbles (FILL)
Sandy Loam, reddish tan, moist, soft to medium stiff, structureless
(Soil Type 2A)
**Front half of pit exposed cement foundation that starts at 4' and
goes to 7'
Bottom of test pit at 8.0 feet.
NOTES
GROUND ELEVATION
LOGGED BY TEC
EXCAVATION METHOD Trackh/Backhoe AT TIME OF EXCAVATION Dry
AT END OF EXCAVATION Dry
AFTER EXCAVATION ---
TEST PIT SIZE
EXCAVATION CONTRACTOR Wiseland GROUND WATER LEVELS:
CHECKED BY MAB
DATE STARTED 6/23/23 COMPLETED 6/23/23
DE
P
T
H
(f
t
)
0.0
2.5
5.0
7.5
GR
A
P
H
I
C
LO
G
ATTERBERG
LIMITS
MATERIAL DESCRIPTION
SA
M
P
L
E
T
Y
P
E
NU
M
B
E
R
FI
N
E
S
C
O
N
T
E
N
T
(%
)
RE
C
O
V
E
R
Y
%
(R
Q
D
)
BL
O
W
CO
U
N
T
S
(N
V
A
L
U
E
)
PO
C
K
E
T
P
E
N
.
(t
s
f
)
DR
Y
U
N
I
T
W
T
.
(p
c
f
)
MO
I
S
T
U
R
E
CO
N
T
E
N
T
(
%
)
LI
Q
U
I
D
LI
M
I
T
PL
A
S
T
I
C
LI
M
I
T
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PAGE 1 OF 1
TEST PIT NUMBER TP-5
CLIENT Keystone Custom Builders
PROJECT NUMBER 00505-0027
PROJECT NAME 68 Wilson Lane
PROJECT LOCATION Rifle, CO
GE
O
T
E
C
H
B
H
C
O
L
U
M
N
S
0
0
5
0
5
-
0
0
2
7
6
8
W
I
L
S
O
N
L
A
N
E
O
W
T
S
.
G
P
J
G
I
N
T
U
S
L
A
B
.
G
D
T
1
0
/
4
/
2
3
Huddleston-Berry Engineering & Testing, LLC
2789 Riverside Parkway
Grand Junction, CO 81501
970-255-8005
Sandy Loam with Organics (TOPSOIL)
Sandy Loam, reddish tan, moist, soft to medium stiff, structureless
(Soil Type 2A)
Sand with Gravel and Cobbles (<35% Rock), tan, moist, medium
dense to dense, structureless (Soil Type 1)
Bottom of test pit at 8.0 feet.
NOTES
GROUND ELEVATION
LOGGED BY TEC
EXCAVATION METHOD Trackh/Backhoe AT TIME OF EXCAVATION dry
AT END OF EXCAVATION dry
AFTER EXCAVATION ---
TEST PIT SIZE
EXCAVATION CONTRACTOR Wiseland GROUND WATER LEVELS:
CHECKED BY MAB
DATE STARTED 9/1/23 COMPLETED 9/1/23
DE
P
T
H
(f
t
)
0.0
2.5
5.0
7.5
GR
A
P
H
I
C
LO
G
ATTERBERG
LIMITS
MATERIAL DESCRIPTION
SA
M
P
L
E
T
Y
P
E
NU
M
B
E
R
FI
N
E
S
C
O
N
T
E
N
T
(%
)
RE
C
O
V
E
R
Y
%
(R
Q
D
)
BL
O
W
CO
U
N
T
S
(N
V
A
L
U
E
)
PO
C
K
E
T
P
E
N
.
(t
s
f
)
DR
Y
U
N
I
T
W
T
.
(p
c
f
)
MO
I
S
T
U
R
E
CO
N
T
E
N
T
(
%
)
LI
Q
U
I
D
LI
M
I
T
PL
A
S
T
I
C
LI
M
I
T
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PL
A
S
T
I
C
I
T
Y
IN
D
E
X
PAGE 1 OF 1
TEST PIT NUMBER TP-6
CLIENT Keystone Custom Builders
PROJECT NUMBER 00505-0027
PROJECT NAME 68 Wilson Lane
PROJECT LOCATION Rifle, CO
GE
O
T
E
C
H
B
H
C
O
L
U
M
N
S
0
0
5
0
5
-
0
0
2
7
6
8
W
I
L
S
O
N
L
A
N
E
O
W
T
S
.
G
P
J
G
I
N
T
U
S
L
A
B
.
G
D
T
1
0
/
4
/
2
3
Huddleston-Berry Engineering & Testing, LLC
2789 Riverside Parkway
Grand Junction, CO 81501
970-255-8005