HomeMy WebLinkAboutAppendix F_Infiltration EvaluationCatavina Residential Development
Draft Initial Study/Mitigated Negative Declaration
September 2025
Appendix F
Infiltration Evaluation
Catavina Residential Development
Draft Initial Study/Mitigated Negative Declaration
September 2025
This page intentionally left blank.
GEOTECHNICAL | ENVIRONMENTAL | MATERIALS
October 2, 2024
Project No. 4038-CR
Blue Fern West, LLC
18300 Redmond Way, Suite 120
Redmond, Washington 98052
Attention: Mr. Shane Bouchard
Subject: Infiltration Evaluation
Proposed Single-Family Residential Development
Catavina Project
Assessor’s Parcel Number (APN) 620-170-009
38105 Portola Avenue
Palm Desert, Riverside County, California
References: See Page 6
Dear Mr. Bouchard:
As requested and authorized, GeoTek, Inc. (GeoTek) has performed an Infiltration Evaluation in
order to provide infiltration test results for three (3) proposed stormwater basins associated
with the subject single-family residential development. The intent of this study is to evaluate
the infiltration properties of the subsurface soils within the proposed project storm water
disposal areas (basins). This report presents the results of this evaluation.
Site Description
The approximately 79.12-acre rectangular shaped project site is located at 38105 Portola
Avenue, in the City of Palm Desert, Riverside County, California (see Figure 1). The site is
currently occupied by an abandoned golf course and associated improvements. A clubhouse, a
storage warehouse building and a parking area occupy the east central portion of the site. A
vehicle maintenance building, a storage equipment building, and two cell towers are located on
the southeast corner of the site. A restroom building and a pump house are located in the
central portion of the site. A water well is understood to be associated with the pump house.
There are two large, dry ponds located in the northern and central sections of the site, and
several concrete-paved cart paths traverse the site. Power lines extend along the eastern
boundary of the site in a north-south direction.
GeoTek, Inc.
1548 North Maple Street, Corona, California 92878
(951) 710-1160 Office (951) 710-1 167 Fax www.geotekusa.com
Blue Fern West, LLC Project No. 4038-CR
Infiltration Evaluation October 2, 2024
Palm Desert, Riverside County, California Page 2
The site can be identified as Riverside County Assessor’s Parcel Number (APN) 620-170-009.
Topographically, the site can be considered as having relatively flat terrain. Site drainage is
generally directed to the south. Site elevations vary from about 270 to 285 feet above mean
sea level.
The site is bound by Frank Sinatra Drive, followed by residential development and vacant land
to the north. Vacant land, followed by Portola Avenue, Desert Willow Golf Resort
Maintenance Department and The Palm Desert Golf Academy at Desert Willow Golf Resort
bound the site to the east. A mobile home park and Palm Desert Green Golf Course bound
the site to the west. A mobile home park bounds the site to the south.
Project Description
Based upon review of a Conceptual Site Plan, prepared by MSA Consulting, Inc. and dated
August 23, 2024, site development for the project will consist of a 556-lot, single-family
residential development. Other project improvements are anticipated to include parks/open
spaces, storm water disposal facilities (basins), underground utilities, interior
street/parking/drive areas and landscape/hardscape improvements.
The three (3) proposed basins are planned in the central and southeastern portions of the
subject site (see Figure 2).
Field Exploration
Six (6) percolation test borings, Borings I-1 through I-6, were excavated within the area of the
proposed basins.
The borings were excavated to depths of about five (5) feet each below the existing grades.
Logs of the borings are presented in Appendix A. The approximate locations of the borings
are indicated on the attached Infiltration Test Location Map, Figure 2.
All borings were approximately 8-inches in diameter. Four-inch diameter slotted PVC pipes
encapsulated in filter sock were inserted into the four (4) percolation test holes. The annular
space between the test hole sidewalls and PVC pipe was filled with gravel.
G E O T E K
Blue Fern West, LLC Project No. 4038-CR
Infiltration Evaluation October 2, 2024
Palm Desert, Riverside County, California Page 3
Soil/Geologic Conditions
Dune sand deposits were encountered in all borings and extended to the maximum depth
explored (5 feet). These materials consisted of poorly graded sands (SP soil type based upon
the Unified Soil Classification System). The logs of the borings are presented in Appendix A.
Groundwater
Groundwater or perched water was not encountered nor observed in any of the borings
conducted for this evaluation. Groundwater was not encountered in any of the previous
excavations performed at the site to a maximum depth of 51.5 feet below the ground surface
(ESS, 2015a).
Infiltration Testing
Following pre-soaking of the test holes in general conformance with the referenced document
(County of Riverside, 2011), percolation testing was performed in the lower approximate 24
inches in each of the percolation borings. The percolation testing was conducted in general
conformance with the referenced document prepared by the County of Riverside. The
percolation rates were converted to an infiltration rate via the Porchet Method.
The infiltration rate for each of the borings is presented in the follow table after the water level
had stabilized.
Boring No. Infiltration Rate (inches per hour) Depth of Boring (feet)
Boring I-1 35.53 5
Boring I-2 53.51 5
Boring I-3 48.62 5
Boring I-4 16.73 5
Boring I-5 56.86 5
Boring I-6 62.03 5
Copies of the percolation data sheets and infiltration conversion sheets (Porchet Method) are
included in Appendix B.
The reported infiltration rates are the measured rate without any factor of safety applied.
Over the lifetime of the water quality facility, the infiltration rates may be affected by silt build
up and biological activities, as well as local variations in near surface soil conditions. A suitable
factor of safety should be applied to the field rates in the design of the infiltration systems.
G E O T E K
Blue Fern West, LLC Project No. 4038-CR
Infiltration Evaluation October 2, 2024
Palm Desert, Riverside County, California Page 4
It should be noted that the infiltration rates provided above were performed in relatively
undisturbed native soils. Infiltration rates will vary and are mostly dependent on the underlying
consistency of the site soils and relative density. Infiltration rates will be impacted by weight of
equipment travelling over the soils, placement of engineered fill and other various factors.
GeoTek, Inc. assumes no responsibility or liability for the ultimate design or performance of
the storm water facilities.
Representatives of GeoTek should observe the soils exposed at the bottom of the stormwater
disposal basins during construction/earthwork operations to confirm suitability and that the
conditions exposed are as anticipated for the proposed stormwater disposal basin.
LIMITATIONS
The earth materials observed on the project site appear to be representative of the tested
areas; however, soil materials vary in character between excavations and natural outcrops or
conditions exposed during site construction. Site conditions may vary due to seasonal changes
or other factors. GeoTek, Inc. assumes no responsibility or liability for work, testing or
recommendations performed or provided by others.
GeoTek’s conclusions and recommendations are professional opinions that are limited to the
extent of the available data. Observations during construction are important to allow for any
change in recommendations found to be warranted. These opinions have been derived in
accordance with current standards of practice and no warranty is expressed or implied.
Standards of practice are subject to change with time.
G E O T E K
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Blue Fern West, LLC Project No. 4038-CR
Infiltration Evaluation October 2, 2024
Palm Desert, Riverside County, California Page 6
REFERENCES
County of Riverside, 2011, “Design Handbook for Low Impact Development, Best Management
Practices”, dated September.
Earth Systems Southwest, 2015a, “Geotechnical Engineering Report, Proposed Catavina
Residential Development, Southwest Corner of Frank Sinatra Drive and Portola Avenue,
Palm Desert, Riverside County, California,” File No. 12329-01, dated February 6.
_____, 2015b, “Report of Infiltration Testing, Proposed Catavina Residential Development,
Southwest Corner of Frank Sinatra Drive and Portola Avenue, Palm Desert, Riverside
County, California,” File No. 12329-01, dated August 21.
MSA Consulting, Inc., 2024, “Conceptual Site Plan, Catavina, Palm Desert, CA”, dated August
23.
G E O T E K
Blue Fern West, LLC
Assessor’s Parcel Number (APN) 620-170-009
Catavina Project
38105 Portola Avenue
Palm Desert, Riverside County, California
Project No. 4038-CR
Figure 1
Site Location
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Topography
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APPENDIX A
LOGS OF EXPLORATORY BORINGS
Proposed Single-Family Residential Development
Catavina Project
38105 Portola Avenue
Palm Desert, Riverside County, California
Project No. 4038-CR
G E O T E K
GeoTek, Inc.
LOG OF EXPLORATORY BORING
#####
0
SP
---Small Bulk ---No Recovery ---Water Table
RV = R-Value Test
SR = Sulfate/Resisitivity Test SH = Shear Test HC= Consolidation MD = Maximum DensityLE
G
E
N
D
Sample type: ---Ring ---SPT ---Large Bulk
Lab testing:AL = Atterberg Limits EI = Expansion Index SA = Sieve Analysis
30
25
20
15
10
BORING TERMINATED AT 6.0 FEET
No groundwater encountered
Borinng backfilled with soil cuttings
5
F-m SAND, light greyish brown, slightly moist, trace silt
Sand becomes f with trace m, moist
Dr
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D
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(p
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)
Ot
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MATERIAL DESCRIPTION AND COMMENTS
Dune Sand Deposits:
SAMPLES
US
C
S
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Boring No.: I-1
Laboratory Testing
De
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(%
)
COORDINATES:33.765995, -116.374095 ELEVATION:264 ft amsl DATE:9/19/2024
PROJECT NO.:4038-CR HAMMER:140#/30"RIG TYPE:GT-16 Track
PROJECT NAME:Catavina Project - Site Plan A DRILL METHOD:Hollow Stem OPERATOR:Victor Z.
CLIENT:Blue Fern West, LLC DRILLER:2R Drilling LOGGED BY:JC
□
GeoTek, Inc.
LOG OF EXPLORATORY BORING
#####
0
SP
---Small Bulk ---No Recovery ---Water Table
RV = R-Value Test
SR = Sulfate/Resisitivity Test SH = Shear Test HC= Consolidation MD = Maximum DensityLE
G
E
N
D
Sample type: ---Ring ---SPT ---Large Bulk
Lab testing:AL = Atterberg Limits EI = Expansion Index SA = Sieve Analysis
30
25
20
15
10
BORING TERMINATED AT 6.0 FEET
No groundwater encountered
Borinng backfilled with soil cuttings
5
F-m SAND, light greyish brown, slightly moist, trace silt
Sand becomes f with trace m, moist
Dr
y
D
e
n
s
i
t
y
(p
c
f
)
Ot
h
e
r
s
MATERIAL DESCRIPTION AND COMMENTS
Dune Sand Deposits:
SAMPLES
US
C
S
S
y
m
b
o
l
Boring No.: I-2
Laboratory Testing
De
p
t
h
(
f
t
)
Sa
m
p
l
e
T
y
p
e
Bl
o
w
s
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6
i
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Sa
m
p
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e
N
u
m
b
e
r
Wa
t
e
r
C
o
n
t
e
n
t
(%
)
COORDINATES:33.766366, -116.374103 ELEVATION:265 ft amsl DATE:9/19/2024
PROJECT NO.:4038-CR HAMMER:140#/30"RIG TYPE:GT-16 Track
PROJECT NAME:Catavina Project - Site Plan A DRILL METHOD:Hollow Stem OPERATOR:Victor Z.
CLIENT:Blue Fern West, LLC DRILLER:2R Drilling LOGGED BY:JC
□
GeoTek, Inc.
LOG OF EXPLORATORY BORING
#####
0
SP
---Small Bulk ---No Recovery ---Water Table
RV = R-Value Test
SR = Sulfate/Resisitivity Test SH = Shear Test HC= Consolidation MD = Maximum DensityLE
G
E
N
D
Sample type: ---Ring ---SPT ---Large Bulk
Lab testing:AL = Atterberg Limits EI = Expansion Index SA = Sieve Analysis
30
25
20
15
10
BORING TERMINATED AT 6.0 FEET
No groundwater encountered
Borinng backfilled with soil cuttings
5
F-m SAND with trace c sand, light greyish brown, slightly moist, trace silt
Moist
Dr
y
D
e
n
s
i
t
y
(p
c
f
)
Ot
h
e
r
s
MATERIAL DESCRIPTION AND COMMENTS
Dune Sand Deposits:
SAMPLES
US
C
S
S
y
m
b
o
l
Boring No.: I-3
Laboratory Testing
De
p
t
h
(
f
t
)
Sa
m
p
l
e
T
y
p
e
Bl
o
w
s
/
6
i
n
Sa
m
p
l
e
N
u
m
b
e
r
Wa
t
e
r
C
o
n
t
e
n
t
(%
)
COORDINATES:33.768718, -116.374045 ELEVATION:275 ft amsl DATE:9/19/2024
PROJECT NO.:4038-CR HAMMER:140#/30"RIG TYPE:GT-16 Track
PROJECT NAME:Catavina Project - Site Plan A DRILL METHOD:Hollow Stem OPERATOR:Victor Z.
CLIENT:Blue Fern West, LLC DRILLER:2R Drilling LOGGED BY:JC
□
GeoTek, Inc.
LOG OF EXPLORATORY BORING
#####
0
SP
---Small Bulk ---No Recovery ---Water Table
RV = R-Value Test
SR = Sulfate/Resisitivity Test SH = Shear Test HC= Consolidation MD = Maximum DensityLE
G
E
N
D
Sample type: ---Ring ---SPT ---Large Bulk
Lab testing:AL = Atterberg Limits EI = Expansion Index SA = Sieve Analysis
30
25
20
15
10
BORING TERMINATED AT 6.0 FEET
No groundwater encountered
Borinng backfilled with soil cuttings
5
F-m SAND with trace c sand, light greyish brown, slightly moist, trace to few
silt
Moist
Dr
y
D
e
n
s
i
t
y
(p
c
f
)
Ot
h
e
r
s
MATERIAL DESCRIPTION AND COMMENTS
Dune Sand Deposits:
SAMPLES
US
C
S
S
y
m
b
o
l
Boring No.: I-4
Laboratory Testing
De
p
t
h
(
f
t
)
Sa
m
p
l
e
T
y
p
e
Bl
o
w
s
/
6
i
n
Sa
m
p
l
e
N
u
m
b
e
r
Wa
t
e
r
C
o
n
t
e
n
t
(%
)
COORDINATES:33.768763, -116.374885 ELEVATION:273 ft amsl DATE:9/19/2024
PROJECT NO.:4038-CR HAMMER:140#/30"RIG TYPE:GT-16 Track
PROJECT NAME:Catavina Project - Site Plan A DRILL METHOD:Hollow Stem OPERATOR:Victor Z.
CLIENT:Blue Fern West, LLC DRILLER:2R Drilling LOGGED BY:JC
□
GeoTek, Inc.
LOG OF EXPLORATORY BORING
#####
0
SP
---Small Bulk ---No Recovery ---Water Table
RV = R-Value Test
SR = Sulfate/Resisitivity Test SH = Shear Test HC= Consolidation MD = Maximum DensityLE
G
E
N
D
Sample type: ---Ring ---SPT ---Large Bulk
Lab testing:AL = Atterberg Limits EI = Expansion Index SA = Sieve Analysis
30
25
20
15
10
BORING TERMINATED AT 6.0 FEET
No groundwater encountered
Borinng backfilled with soil cuttings
5
F-m SAND, light greyish brown, slightly moist, trace silt
Sand becomes f with trace m, moist
Dr
y
D
e
n
s
i
t
y
(p
c
f
)
Ot
h
e
r
s
MATERIAL DESCRIPTION AND COMMENTS
Dune Sand Deposits:
SAMPLES
US
C
S
S
y
m
b
o
l
Boring No.: I-5
Laboratory Testing
De
p
t
h
(
f
t
)
Sa
m
p
l
e
T
y
p
e
Bl
o
w
s
/
6
i
n
Sa
m
p
l
e
N
u
m
b
e
r
Wa
t
e
r
C
o
n
t
e
n
t
(%
)
COORDINATES:33.768801, -116.373352 ELEVATION:275 ft amsl DATE:9/19/2024
PROJECT NO.:4038-CR HAMMER:140#/30"RIG TYPE:GT-16 Track
PROJECT NAME:Catavina Project - Site Plan A DRILL METHOD:Hollow Stem OPERATOR:Victor Z.
CLIENT:Blue Fern West, LLC DRILLER:2R Drilling LOGGED BY:JC
□
GeoTek, Inc.
LOG OF EXPLORATORY BORING
#####
0
SP
---Small Bulk ---No Recovery ---Water Table
RV = R-Value Test
SR = Sulfate/Resisitivity Test SH = Shear Test HC= Consolidation MD = Maximum DensityLE
G
E
N
D
Sample type: ---Ring ---SPT ---Large Bulk
Lab testing:AL = Atterberg Limits EI = Expansion Index SA = Sieve Analysis
30
25
20
15
10
BORING TERMINATED AT 6.0 FEET
No groundwater encountered
Borinng backfilled with soil cuttings
5
F SAND with trace m sand, light greyish brown, slightly moist, trace silt
Moist
Dr
y
D
e
n
s
i
t
y
(p
c
f
)
Ot
h
e
r
s
MATERIAL DESCRIPTION AND COMMENTS
Dune Sand Deposits:
SAMPLES
US
C
S
S
y
m
b
o
l
Boring No.: I-6
Laboratory Testing
De
p
t
h
(
f
t
)
Sa
m
p
l
e
T
y
p
e
Bl
o
w
s
/
6
i
n
Sa
m
p
l
e
N
u
m
b
e
r
Wa
t
e
r
C
o
n
t
e
n
t
(%
)
COORDINATES:33.768839, -116.377199 ELEVATION:273 ft amsl DATE:9/19/2024
PROJECT NO.:4038-CR HAMMER:140#/30"RIG TYPE:GT-16 Track
PROJECT NAME:Catavina Project - Site Plan A DRILL METHOD:Hollow Stem OPERATOR:Victor Z.
CLIENT:Blue Fern West, LLC DRILLER:2R Drilling LOGGED BY:JC
□
APPENDIX B
PERCOLATION DATA AND CONVERSION SHEETS
Proposed Single-Family Residential Development
Catavina Project
38105 Portola Avenue
Palm Desert, Riverside County, California
Project No. 4038-CR
G E O T E K
Project:Job No.:4038-CR
Test Hole No.:Tested By:Date:9/19/2024
Depth of Hole As Drilled: Before Test:After Test:60
Reading
No. Time
Time
Interval
(Min)
Total
Depth
of Hole
(Inches)
Initial
Water Level
(Inches)
Final
Water
Level
(Inches)
Δ in Water
Level
(Inches)
Rate
(Minutes
per Inch)
11:30 AM 60 24
11:55 AM 25 0 24.00
11:56 AM 60 24
12:21 PM 25 0 24.00
12:22 PM 60 24
12:24 PM 2 1.56 22.44
12:25 PM 60 24
12:27 PM 2 6 18.00
12:28 PM 60 24
12:30 PM 2 10.8 13.20
12:31 PM 60 24
12:33 PM 2 12 12.00
12:34 PM 60 24
12:36 PM 2 12.12 11.88
12:37 PM 60 24
12:39 PM 2 12.12 11.88
60 60
PERCOLATION DATA SHEET
Catavina Project - Site Plan A
I-1 JC
Comments
Trial N/A Pre-soaked with 5+ gallons
of clear water prior to Trials
Trial N/A
Testing intervals adjusted
1 0.09 for rapid infiltration rates
2 0.11
3 0.15
4 0.17
5 0.17
6 0.17
G E O T E K
Project:Job No.:4038-CR
Test Hole No.:Tested By:Date:9/19/2024
Depth of Hole As Drilled: Before Test:After Test:60
Reading
No. Time
Time
Interval
(Min)
Total
Depth
of Hole
(Inches)
Initial
Water Level
(Inches)
Final
Water
Level
(Inches)
Δ in Water
Level
(Inches)
Rate
(Minutes
per Inch)
11:30 AM 60 24
11:55 AM 25 0 24.00
11:56 AM 60 24
12:21 PM 25 0 24.00
12:22 PM 60 24
12:23 PM 1 7.56 16.44
12:24 PM 60 24
12:25 PM 1 13.44 10.56
12:26 PM 60 24
12:27 PM 1 12.6 11.40
12:28 PM 60 24
12:29 PM 1 13.92 10.08
12:30 PM 60 24
12:31 PM 1 14.4 9.60
12:32 PM 60 24
12:33 PM 1 14.52 9.48
6 0.11
4 0.10
5 0.10
2 0.09
3 0.09
Trial N/A
Testing intervals adjusted
1 0.06 for rapid infiltration rates
Comments
Trial N/A Pre-soaked with 5+ gallons
of clear water prior to Trials
60 60
PERCOLATION DATA SHEET
Catavina Project - Site Plan A
I-2 JC
G E O T E K
Project:Job No.:4038-CR
Test Hole No.:Tested By:Date:9/19/2024
Depth of Hole As Drilled: Before Test:After Test:60
Reading
No. Time
Time
Interval
(Min)
Total
Depth
of Hole
(Inches)
Initial
Water Level
(Inches)
Final
Water
Level
(Inches)
Δ in Water
Level
(Inches)
Rate
(Minutes
per Inch)
11:30 AM 60 24
11:55 AM 25 0 24.00
11:56 AM 60 24
12:21 PM 25 0 24.00
12:22 PM 60 24
12:23 PM 1 9.24 14.76
12:24 PM 60 24
12:25 PM 1 12 12.00
12:26 PM 60 24
12:27 PM 1 12.84 11.16
12:28 PM 60 24
12:29 PM 1 14.88 9.12
12:30 PM 60 24
12:31 PM 1 15.12 8.88
12:32 PM 60 24
12:33 PM 1 15.24 8.76
6 0.11
4 0.11
5 0.11
2 0.08
3 0.09
Trial N/A
Testing intervals adjusted
1 0.07 for rapid infiltration rates
Comments
Trial N/A Pre-soaked with 5+ gallons
of clear water prior to Trials
60 60
PERCOLATION DATA SHEET
Catavina Project - Site Plan A
I-3 JC
G E O T E K
Project:Job No.:4038-CR
Test Hole No.:Tested By:Date:9/19/2024
Depth of Hole As Drilled: Before Test:After Test:60
Reading
No. Time
Time
Interval
(Min)
Total
Depth
of Hole
(Inches)
Initial
Water Level
(Inches)
Final
Water
Level
(Inches)
Δ in Water
Level
(Inches)
Rate
(Minutes
per Inch)
11:30 AM 60 24
11:55 AM 25 0 24.00
11:56 AM 60 24
12:21 PM 25 0 24.00
12:22 PM 60 24
12:32 PM 10 0 24.00
12:33 PM 60 24
12:43 PM 10 1.44 22.56
12:44 PM 60 24
12:54 PM 10 2.04 21.96
12:55 PM 60 24
1:05 PM 10 2.52 21.48
1:06 PM 60 24
1:16 PM 10 2.64 21.36
1:17 PM 60 24
1:27 PM 10 2.64 21.36
6 0.47
4 0.47
5 0.47
2 0.44
3 0.46
Trial N/A
1 N/A
Comments
Trial N/A Pre-soaked with 5+ gallons
of clear water prior to Trials
60 60
PERCOLATION DATA SHEET
Catavina Project - Site Plan A
I-4 JC
G E O T E K
Project:Job No.:4038-CR
Test Hole No.:Tested By:Date:9/19/2024
Depth of Hole As Drilled: Before Test:After Test:60
Reading
No. Time
Time
Interval
(Min)
Total
Depth
of Hole
(Inches)
Initial
Water Level
(Inches)
Final
Water
Level
(Inches)
Δ in Water
Level
(Inches)
Rate
(Minutes
per Inch)
11:30 AM 60 24
11:55 AM 25 0 24.00
11:56 AM 60 24
12:21 PM 25 0 24.00
12:22 PM 60 24
12:23 PM 1 7.32 16.68
12:24 PM 60 24
12:25 PM 1 9.12 14.88
12:26 PM 60 24
12:27 PM 1 12.72 11.28
12:28 PM 60 24
12:29 PM 1 13.44 10.56
12:30 PM 60 24
12:31 PM 1 13.92 10.08
12:32 PM 60 24
12:33 PM 1 14.04 9.96
6 0.10
4 0.09
5 0.10
2 0.07
3 0.09
Trial N/A
Testing intervals adjusted
1 0.06 for rapid infiltration rates
Comments
Trial N/A Pre-soaked with 5+ gallons
of clear water prior to Trials
60 60
PERCOLATION DATA SHEET
Catavina Project - Site Plan A
I-5 JC
G E O T E K
Project:Job No.:4038-CR
Test Hole No.:Tested By:Date:9/19/2024
Depth of Hole As Drilled: Before Test:After Test:60
Reading
No. Time
Time
Interval
(Min)
Total
Depth
of Hole
(Inches)
Initial
Water Level
(Inches)
Final
Water
Level
(Inches)
Δ in Water
Level
(Inches)
Rate
(Minutes
per Inch)
11:30 AM 60 24
11:55 AM 25 0 24.00
11:56 AM 60 24
12:21 PM 25 0 24.00
12:22 PM 60 24
12:23 PM 1 11.04 12.96
12:24 PM 60 24
12:25 PM 1 12.72 11.28
12:26 PM 60 24
12:27 PM 1 13.08 10.92
12:28 PM 60 24
12:29 PM 1 13.2 10.80
12:30 PM 60 24
12:31 PM 1 13.32 10.68
12:32 PM 60 24
12:33 PM 1 13.32 10.68
6 0.09
4 0.09
5 0.09
2 0.09
3 0.09
Trial N/A
Testing intervals adjusted
1 0.08 for rapid infiltration rates
Comments
Trial N/A Pre-soaked with 5+ gallons
of clear water prior to Trials
60 60
PERCOLATION DATA SHEET
Catavina Project - Site Plan A
I-5 JC
G E O T E K
Equation -It =
Havg = (HO+HF)/2 =
It = Inches per Hour
Time Interval, Δt = 2
Client:Blue Fern West, LLC
Project:Catavina Project
Project No:4038-CR
Date:9/19/2024
Boring No.I-1
Percolation to Infiltration Rate (Porchet Method)
Final Depth to Water, DF =47.88
Test Hole Radius, r =4
Initial Depth to Water, DO =36
35.53
Total Test Hole Depth, DT = 60
ΔH (60r)
Δt (r+2Havg)
HO = DT - DO = 24
HF = DT - DF = 12.12
ΔH = ΔD = HO- HF = 11.88
18.06
G EOT E K
Equation -It =
Havg = (HO+HF)/2 =
It = Inches per Hour
Time Interval, Δt = 1
Client:Blue Fern West, LLC
Project:Catavina Project
Project No:4038-CR
Date:9/19/2024
Boring No.I-2
Percolation to Infiltration Rate (Porchet Method)
Final Depth to Water, DF =45.48
Test Hole Radius, r =4
Initial Depth to Water, DO =36
53.51
Total Test Hole Depth, DT = 60
ΔH (60r)
Δt (r+2Havg)
HO = DT - DO = 24
HF = DT - DF = 14.52
ΔH = ΔD = HO- HF = 9.48
19.26
G EOT E K
Equation -It =
Havg = (HO+HF)/2 =
It = Inches per Hour
Time Interval, Δt = 1
Client:Blue Fern West, LLC
Project:Catavina Project
Project No:4038-CR
Date:9/19/2024
Boring No.I-3
Percolation to Infiltration Rate (Porchet Method)
Final Depth to Water, DF =44.76
Test Hole Radius, r =4
Initial Depth to Water, DO =36
48.62
Total Test Hole Depth, DT = 60
ΔH (60r)
Δt (r+2Havg)
HO = DT - DO = 24
HF = DT - DF = 15.24
ΔH = ΔD = HO- HF = 8.76
19.62
G EOT E K
Equation -It =
Havg = (HO+HF)/2 =
It = Inches per Hour
Time Interval, Δt = 10
Client:Blue Fern West, LLC
Project:Catavina Project
Project No:4038-CR
Date:9/19/2024
Boring No.I-4
Percolation to Infiltration Rate (Porchet Method)
Final Depth to Water, DF =57.36
Test Hole Radius, r =4
Initial Depth to Water, DO =36
16.73
Total Test Hole Depth, DT = 60
ΔH (60r)
Δt (r+2Havg)
HO = DT - DO = 24
HF = DT - DF = 2.64
ΔH = ΔD = HO- HF = 21.36
13.32
G EOT E K
Equation -It =
Havg = (HO+HF)/2 =
It = Inches per Hour
Time Interval, Δt = 1
Client:Blue Fern West, LLC
Project:Catavina Project
Project No:4038-CR
Date:9/19/2024
Boring No.I-5
Percolation to Infiltration Rate (Porchet Method)
Final Depth to Water, DF =45.96
Test Hole Radius, r =4
Initial Depth to Water, DO =36
56.86
Total Test Hole Depth, DT = 60
ΔH (60r)
Δt (r+2Havg)
HO = DT - DO = 24
HF = DT - DF = 14.04
ΔH = ΔD = HO- HF = 9.96
19.02
G EOT E K
Equation -It =
Havg = (HO+HF)/2 =
It = Inches per Hour
Time Interval, Δt = 1
Client:Blue Fern West, LLC
Project:Catavina Project
Project No:4038-CR
Date:9/19/2024
Boring No.I-6
Percolation to Infiltration Rate (Porchet Method)
Final Depth to Water, DF =46.68
Test Hole Radius, r =4
Initial Depth to Water, DO =36
62.03
Total Test Hole Depth, DT = 60
ΔH (60r)
Δt (r+2Havg)
HO = DT - DO = 24
HF = DT - DF = 13.32
ΔH = ΔD = HO- HF = 10.68
18.66
G EOT E K