HomeMy WebLinkAbout20182717.tiffApril 5, 2018
Richard Dumm (ufcowdoc@msn.com)
P.O. Box 250
Severance, CO 80546
C
Re: Test Pit Observation Results and OWTS Design Document
Dairy Tech OWTS
Weld County, Colorado
EEC Project No. 18-01-052
Mr. Dumm:
C
EARTH
ENGINEERING
COMPANY, INC.
On March 23'', 2018, Earth Engineering Company, Inc. (EEC) personnel completed the
percolation testing you requested for the above referenced project. The purpose of this
letter is to provide "design documentation" for the new facility and existing 2 -bedroom
residence in accordance with the Weld County Department of Public Health and
Environment regulations.
To complete the site soil evaluation, EEC personnel observed two (2) soil profile test pits
to a depth of approximately 8 feet below present site grade. The logs of the 8 feet deep test
pits are included with this report.
The referenced site is located northeast of the intersection of Weld County Roads 21 and
70, north of Windsor in Weld County, Colorado. The site had an approximately 2% slope
toward the east and was presently developed with existing buildings and a driveway atthe
time of our field workAccording to the information made available to EEC, there are no
utilities or easements in conflict with the presented locations of the system components.
The materials encountered in the profile test pits at the on -site wastewater treatment system
(OWTS) site generally consisted of brown/light brown sandy lean clay soils and
brown/dark brown sandy clay apparent fill materials underlain by grey/tan and rust
claystone bedrock at a depth of approximately 7 feet below present site grades which
extended to the depths explored. At the time of excavating, no groundwater was observed
in the test pits.
P.O. Box 271428, Fort Collins, CO80527S phone: 970.775.2004 fax: 970.6 63.0282
Earth Engineering Company, Inc.
EEC Project No. 18-01-052
April 5, 2018
Page 2
Based upon the visual soil classification, the site sandy lean clay soils and the site sandy
lean clay apparent fill materials classify as Soil Type 4A which corresponds to a
percolation rate of 91 to 120 minutes per inch. Soil Type 4A classification should be
assumed in the design. Weld County standards also require that neither groundwater nor
bedrock be encountered within 6 feet below ground surface in the area of a conventional
absorption field. The test pit completed indicates the near surface site soils do meet the
bedrock and groundwater criteria. Based on the results as outlined above, it appears and
engineered -type septic absorption system would be required for the residence and Weld
County Health Department regulations will require a design document for the system. In
siting of the absorption field, Weld County criteria concerning proximity to drainage ways,
property lines and other site features should be addressed.
Wastewater Strength
We expect the wastewater disposed through the OWTS for this site will be within the range
of properties for average residential applications as shown in the following table:
Table 8: Typical Composition of Untreated Domestic Wastewater
Composition
Units
Concentration
Weak
Average
Strong
Total
Suspended
Solids
Mg/L
100
220
350
BOLD
at 20°C
Mg/L,
1 1 0
220
400
0
Nitrogen
(:total
as
N)
Mg.IL
20
40
85
Phosphorus (total
as P)
Mgt
4
8
15
Mg/L.
50
100
150
Fats,
Oil
&. Grease (FOCI)
Total
Colifornn
Mg/L
106-107
107-108
10k-109
Source: Table 8, Typical Composition of Untreated Domestic Wastewater from
Wastewater Engineering, Treatment, Disposal and Reuse, Metcalf & Eddy, 1991
Assumptions
It is our understanding the existing residence at the site contains 2 bedrooms and the
proposal Dairy Tech facility will have a maximum of 20 office workers. Based on Weld
County Guidelines, the residence will contribute 300 gpd and the Dairy Tech facility will
Earth Engineering Company, Inc.
EEC Project No. 18-01-052
April 5, 2018
Page 3
contribute 15 gallons per worker per day, or 300 gpd. A design flow rate of 600 gpd as
determined from Table 30--1 and 30-6-2 was used to size the absorption field. In addition,
a Long Term Absorption Rate (LTAR) of 1.0 gpd/ft2 was determined from Table 30-10-1
utilizing the absorption rate of the unlined sand filter. Initial size calculations indicate 600
ft2 of required absorption area, which was used in the design. Applying the equivalent area
for Quick4 Infiltrators of 12 ft2 per chamber for a bed system, a required number of 52
chambers was determined. The prepared design incorporates 52 Quick4 Infiltrator
chambers in a pressure dosed sand filter system consisting of 4 rows of 13 chambers per
row as shown on the attached site layout plan.
System Component Specifications
The system is intended to incorporate a 1,000 gallon two -chamber precast concrete septic
tank to serve the proposal Dairy Tech building and a 1,000 gallon two -chamber precast
tank to serve the existing residence, both leading to a 1,000 gallon single -chamber pump
tank equipped with an Orenco PESO Fligh Head Effluent pump for pressure dosing of the
absorption field. The septic tanks and pump chamber shall comply with the structural
design criteria of ASTM C1227-12 (Standard Specification for Precast Septic Tanks). 30"
risers may be needed to facilitate required bury depth based on pipe elevations exiting the
house. Shop drawings and specifications should be furnished by the installer once a tank
supplier is selected. Groundwater was not observed in the test borings at the site, therefore
anchoring of the septic tank does not appear necessary.
The distribution lines shall consist of 2" diameter schedule 40 PVC pips with 1/8" holes
drilled every 4 feet on center. The pipes should be laid directly on the imported sand bed
and the pipe holes shall be oriented to spray upwards with one drain hole drilled on the
underside of the pipe at the far end of each line to allow the pipe to drain when the pump
cycles off
Installation Procedures
It appears the system could be installed using conventional excavation equipment (i.e.
rubber tire backhoe or track hoe). All system components shall be installed using current
Earth Engineering Company, Inc.
EEC Project No. 18-01-052
April 5, 2018
Page 4
state -of -practice technology by a licensed installer approved by the Weld County
Department of Health and Environment.
After the bed area has been excavated, the imported replacement concrete sand shall be
moistened and lightly compacted to reduce the potential for chamber settling. The end of
each pressure pipe shall be fitted with a flushing valve assembly and inspection ports shall
be installed at the corners of the field.
System Operation and Maintenance
Please find attached A Homeowner's Guide to Septic Systems as prepared by the United
States Environmental Protection agency. This guide contains useful information regarding
the operation and maintenance of your septic system. The guide may also be found online
at http://www.epa.gov/o m/septic/pubs/homeowner_guide_long.pdf
GENERAL COMMENTS
The analysis and recommendations presented in this report are based upon the data
obtained from the soil test pits performed at the indicated locations and from any other
information discussed in this report. This report does not reflect any variations which may
occur across the site. The nature and extent of such variations may not become evident
until construction. If variations appear evident, it will be necessary to re-evaluate the
recommendations of this report.
It is recommended that the geotechnical engineer be retained to review the plans and
specifications so comments can be made regarding the interpretation and implementation
of our geotechnical recommendations in the design and specifications. It is further
recommended that the geotechnical engineer be retained for testing and observations
during earthwork and foundation construction phases to help determine that the design
requirements are fulfilled.
This report has been prepared for the exclusive use of Richard Dumm for specific
application to the project discussed and has been prepared in accordance with generally
accepted geotechnical engineering practices. No warranty, express or implied, is made. In
the event that any changes in the nature, design or location of the project as outlined in this
Earth Engineering Company, Inc.
EEC Project No. 18-01-052
April 5, 2018
Page 5
report are planned, the conclusions and recommendations contained in this report shall not
be considered valid unless the changes are reviewed and the conclusions of this report are
modified or verified in writing by the geotechnical engineer.
We appreciate the opportunity to be of service to you on this project. If you have any
questions concerning this report, or if we can be of further service to you in any other way
please do not hesitate to contact us..
Very truly yours,
Earth Engineering Company, Inc.
Michael J. Cole . P.E.
Principal Engineer
N
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hi
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Not To Scale
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SHED
EXISTINC RESIDENCE
X DC x
FENCE
DRIVEWAY
X
EXISTING BUILDING
PROPOSED LEACHFIELD SITE
TP 2
EXIST1NO BUILDING
SLIGHT TO MODERATE SLOPE
DRIVEWAY
D TCH
WELD COUNTY ROAD 70
LEGEND
-S1-TP-1 TEST PIT LOCATION
SITE PHOTOS
PHOTOS TAKEN Ipc APPROXIMATE S%NBOL tWCAT1ON IN OIRECTION OF aRROw
TEST PIT LOCATION DIAGRAM
DAIRY TECH OWTS
WELD COUNTY, COLORADO
PROJECT NUMBER: 18 01-052 DATE: MARCH 2018
EARTH ENGINEERING COMPANY
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DAIRY TECH � WTS
WELD COUNTY, CO
EEC PR� JECT Pdo . 14 -01 - 052
NIARCH 2O18
� � � CC�N1f�A6�lYl �NC.
WELD
DAIRY
TECH - OWTS
COUNTY, COLORADO
PROJECT NO: 18-01-052
DATE: MARCH 2018
LOG OF TEST PIT NO. 1
RIG TYPE: BACKHOE
1
WATER
DEPTH
SHEET 1 OF
FOREMAN: SM
START DATE
3/23/2018
WHILE EXCAVATING
None
AUGER TYPE: N/A
FINISH DATE
3/23/2018
AFTER EXCAVATING
None
SPT HAMMER: MA
SURFACE ELEV
N/A
24 HOUR
N/A
SOIL DESCRIPTION
D
N
QU
MC
DD
A -LIMITS
-200
SWELL
TYPE
(FEET)
(BLOWS/FT)
(PSF)
(%)
(PCF)
LL
PI
(%)
PRESSURE
%
@
500 PSF
6" TOPSOIL AND VEGETATION
_ _
1
SANDY LEAN CLAY (CL)
brownllight brown
2
very stiff
— —
silty with a slight amount of gravel
BS
3
14.6
4
BS
5
14.8
28
15
58.3
6
brownlgrey/rust
— —
BS
7
16.9
26
11
67.9
CLAYSTONE
grey/tar/rust. moderately hard
BS
8
19.0
8' BOTTOM OF TEST PIT
_ —
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Earth Engineering Company
WELD
DAIRY
TECH - OWTS
COUNTY, COLORADO
PROJECT NO: 18-01-052
DATE: MARCH 2018
LOG OF TEST PIT NO. 2
RIG TYPE: BACKHOE
1
WATER
DEPTH
SHEET 1 OF
FOREMAN: SM
START DATE
3/23/2018
WHILE EXCAVATING
None
AUGER TYPE: N/A
FINISH DATE
3/23/2018
AFTER EXCAVATING
None
SPT HAMMER: MA
SURFACE ELEV
I
N/A
24 HOUR
N/A
SOIL DESCRIPTION
D
N
QU
MC
DD
A -LIMITS
-200
SWELL
TYPE
(FEET)
(BLOWS/FT)
(PSF)
(%)
(PCF)
LL
PI
(%)
PRESSURE
%
@
500 PSF
FILL: SANDY LEAN CLAY (CL)
brownldark brown
very stiff
1
2
silty with gravel
_ _
BS
3
9.4
27
12
48.1
4
BS
5
11.6
SANDY LEAN CLAY (CL)
_ _
greylb rownlru s t
6
very stiff
_ _
silty with claystone fragments
BS
7
16.3
CLAYSTONE
_ _
grey/tan/rust. moderately hard
BS
8
20.5
8' BOTTOM OF TEST PIT
— —
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Earth Engineering Company
Earth Engineering Company, Inc.
Summary of Laboratory Gradation Test
100.0%
90.0%
80.0%
70.0%
Percent Finer by Weighs
60.0%
50.0%
40.0%
30.0%
20.0%
10.0%
0.0i1 0
1 00
10
0. 1
Grain Size in Millimeters,
0.0 1
0.00 1
Project: Dariy Tech O TS
City Location:
Project Number: 18-01-15.2
Date: March 2018
S i eve Size
Percent Pass in g
No.
4
99%
No.
10
98%
No.
40
95%
No. 200
58%
Weld County, Colorado
Sample Location: TP-1, 5-2 @ 4'
Description: Brown/Light Brown Sandy Lean Clay
C
EARTH
ENGINEERING
COMPANY, INC,
Earth Engineering Company, Inc.
Summary of Laboratory Gradation Test
Percent Finer by Weighs
100.0%
90.0%
80.0%
70.0%
60.0%
50.0%
40.0%
30.0%
20.0%
10.0%
0.0i1 0
1 00
0-
10
0. 1
Grain Size in Millimeters,
0.0 1
0.00 1
Project: Dariy Tech O TS
City Location:
Project Number: 18-01-15.2
Date: March 2018
Sieve Size
Percent Passing
No.
4
100%
No.
10
99%
No.
40
96%
No. 200
68%
Weld County, Colorado
Sample Location: TP-1, S-3 @ 6'
Description: Brown/Grey/Rust Sandy Lean Clay
C
C
C
EAPTH
ENGINEERING
COMPANY, INC.
Earth Engineering Company, Inc.
Summary of Laboratory Gradation Test
100.0%
90.0%
80.0%
70.0%
Percent Finer by Weighs
60.0%
50.0%
40.0%
30.0%
20.0%
10.0%
0.0i1 0
1 00
10
0. 1
Grain Size in Millimeters,
0.0 1
0.00 1
S i eve Size
Percent Pass in g
No.
4
99%
No.
10
97%
No.
40
91%
No. 200
48%
Project: Dariy Tech OWTS
City Location: Weld County, Colorado
Project Number: 18-01-15.2
Date: March 2018
Sample Location: TP-2, 5-2 @ 4'
Description: Fill: Brown/Dark Brown Sandy Lean Clay
C
C
EARTH
ENGINEERING
COMPANY, INC,
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Pump Selection for a Pressurized System - Commerical Project
Dairy Tech 1 EEC Project No. 18-01-052
Parameters
Discharge Assembly Size
Transport Length
Transport Pipe Class
Transport Line Size
Distributing Va lve Model
Max Elevation Lift
Manifold Length
Manifold Pipe Class
Manifold Pipe Size
Number of Laterals per Cell
Lateral Length
Lateral Pipe Class
Lateral Pipe Size
Orifice Size
Orifice Spacing
Residual Head
Row Meter
"Add-on' Friction Losses
Calculations
2.00 inches
295 feet
40
2.00 inches
None
5 feet
10 feet
40
2.00 inches
4
52 feet
40
2.00 inches
1/8 inches
4 feet
5 feet
None inches
0 feet
Minimum How Rate per Orifice
Number of Orifices per Zone
Total Row Rate per Zone
Number of Laterals per Zone
% Row Differential 1st/Last Orifice
Transport Velocity
Frictional Head Losses
0.43
56
24.2
4
0.1
2.3
gpm
gpm
fps
Loss through Discharge
Loss in Transport
Loss through Valve
Loss in Manifold
Loss in Laterals
Loss through Flowmeter
'Add-on' Friction Losses
Pipe Volumes
1.2
3.1
0.0
0.0
0.0
0.0
0.0
feet
feet
feet
feet
feet
feet
feet
Vol of Transport Line
Vol of Manifold
Vol of Laterals per Zone
Total Volume
51.4
1.7
36.3
89.4
Minimum Pump Requirements
gals
gals
gals
gals
Design Flow Rate
Total Dynamic Head
0.1416t
aiii
Orenco Systems
Incorporated
Qxnngrng the Way the
World Does Wastewater'
24.2 gpm
14.3 feet
40
C, u. 100
0
_ 0
E
C
a
3 60
2
60
70
10 20 30 40 50
Net Discharge (gpm)
Pu mp Data
PF5005 High Head Effluent Pump
50 GPM, 1/2HP
11 5/230V 10 60Hz,200,230V30501r
PF5007 High Head Effluent Pump
50 GPM, 3/4HP
230V 1060Hz, 60Hz, 200/230/460V 30 60Hz
PF5410 High Head Effluent Pump
50 GPM, 1HP
230V 10 60Hz, 20014660V 306011z
PF5015 High Head Effluent Pump
50 GPM, 1-1/2HP
230V 10 60Hz, 200V 30 60Hz
Legend
System Curve:
Pump Curve:
Pump Optimal Ranges
Operating Point°
Design Point°
80
k
1
i
Fn _
1
ti
II
1
11
V
co
t
1
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t
t
\s
k
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North
1"=.507
i
0
\f�
2•
t
t
s
ti
1
1
t
Li
17;;;;G fi
!f UILDING
J`
ISTLG
HUILDING
I
t
t
S
S
S
EXISTING
BUILDING
skt
s:":i"\s\s\k\s'':'ss>so'H'vi\::s\H\c.,,,\:\\o\\vl\\\\:izic\\\\1\:::::::;1:
\NSC.1% \\1/4\k:
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1 `fit \ \
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septic tank
I. satin
C \
EXISTLIG
EDGE OF
ASPHALT
f1,000 gal
pump tank
OWTS LOCATION DIAGRAM
PROPOSED DAIRY TECH BUILDING
WELD COUNTY, COLORADO
PROJECT NUMBER: 18-01-052 DATE: APRIL 2018
1 {gyp YEAR
HXL-816.60
FLOVAJNE
TOP OF
BERM -4817.00
20' SPILLWAY
ELEV=4816.SO
WATER QUALITY
OUTLET
STR'UDTIIRE,
SEE DETAIL
18.2 LF 12:
PVC AT 1.0%
SLOPE (LENGTH
INO..UDES FES)
TOP OF
BERM -4E
EARTH ENGINEERING COMPANY
From
Purnp
1,000 go
Tonk
L.-1
11 Limits of Overexcovation
(17.5'x94')
Septic Field Limits 098 ft2)
r
-
li
I
'I 7-4„
1
i
I
Inspection Port (Type)
Quick4 Infiltrator'"
Unit lTvp,)
,•�
1
1
NOTES:
— 2" SCHEDULE 40 LINE SHALL
BE USED FROM
PUMP TANK TO MANIFOLD
— FLUSHING VALVE ASSEMBLY SHALL
AT THE END OF EACH PRESSURE
— FLOATS TO BE ON' SEPARATE
— CONTROL PANEL SHALL BE ORENCO
APPROVED EQUIVALENT
STEM
BE
PIPE
FROM
S1
INSTALLED
R0
PUMP
ETMCT
PIPING
OR
T�;i
E'i=:tiria -r �:�e
1r _ 1; --1
:`)
4-
p ,
+
Scope to Drain_
- 4 Seeded Topsoil
8" Min
Existing Ground
18 Max Surface
_
L
_Sond•••: Lean Clay
\\\,\,�
Clay/Fill
�'r
,,.a
Units—�
—
/\.\
UtJtd
T
r
, '
• • •'.. Claystone \ )S23.
2" Perforated Pipe
f•
min— ' f • ,: Y5,. ..;i" •V
Infiltrator
_ • _ ' 4" Topsoil & Vegetation ; • : • .
(SM)
ELL .-
.
—.
S
FU T
N
,'
I
\
r
2" Perforated
Drilled
ELL
Pipe
per report
D P�A,••
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SCALE SECTION
rr_��}
SIZING CALCULATIONS
— LAP. II'•:'IER L''iUNTY STANDARDS
LTA ;. for Concrete Sand: I(LTAR = 1,0)
Required Bed Area According to Equation
2 Bedroom
30-10-20D:
Residence
600
and Hew
ft 2
Facility (Q=600 gpd)
Area per Quick -4 Infiltrator' Unit = 12 ftz
Total Number cif Infiltrator' Units Required = 52
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