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BETTER PEOPLE•BETTER SERVICE•BETTER RESULTS
May 15,2015 Project No. 15802-12A
Paul and Andy Laubach
PROVIDENCE CAPITAL GROUP,LLC
183 Calle Magdalena,Suite 100
Encinitas,CA 92024
Subject: Interpretive Report for Infiltration System Design, Proposed Commercial Development,
Assessor's Parcel Number 910-272-011, Located at 41427 Sanborn Avenue, City of Temecula,
Riverside County,California
Earth-Strata, Inc. is pleased to present this interpretive report for the proposed commercial development, located
at 41427 Sanborn Avenue, in the City of Temecula, Riverside County, California. The purpose of our study was to
determine the infiltration rates and physical characteristics of the subsurface earth materials within the proposed
development. We have provided guidelines for the design of onsite bio swale retention systems,where applicable.
This study is intended to provide onsite infiltration rates for the earth materials at the approximate depth near the
proposed retention basins.
PROPERTY DESCRIPTION
The subject property is located at 41427 Sanborn Avenue in the City of Temecula, Riverside County, California (see
Figure 1). The subject property consists of an undeveloped parcel of land with relatively flat terrain. The subject
property is underlain by compacted fill and alluvium.
PROPOSED CONSTRUCTION
Based on information provided by you, the proposed development will consists of a parking lot with interior
driveways, utilities and on-site retention basins.
SUBSURFACE EXPLORATION AND INFILTRATION TESTING
SUBSURFACE EXPLORATION
Subsurface exploration of the subject site consisted of 3 exploratory excavations to a depth of 11 Y2 feet, conducted
on May 12, 2015. The exploratory holes were excavated to evaluate insitu permeability rates. The approximate
location of the exploratory excavations are shown on the attached Infiltration Location Map, Plate 1.
EARTH MATERIALS
A general description of the earth materials observed on site is provided below.
• Artificial Fill Undocumented (map symbol AO: Undocumented artificial fill materials were encountered
throughout the site within the upper 5 feet during exploration. These materials are typically locally
derived from the native materials and consist generally of yellowish brown clayey sand. These materials
are generally inconsistent,well consolidated fills.
• Quaternary Young Fan Deposits (tromp symbol Oyfl: Quaternary old fan deposits were encountered to a
maximum depth explored. These alluvial deposits consist predominately of gray brown, fine to coarse
grained sand interlayered with sandy silt. These deposits were generally noted to be in a moist, medium
dense.
GROUNDWATER
Groundwater was not observed within the exploratory excavations.
INFILTRATION TESTING
The continuous presoak test method was utilized to perform a total of four (4) infiltration tests on April 25, 2015
to evaluate near surface infiltration rates in order to estimate the amount of storm water runoff that can percolate
into the onsite bio Swale retention basins. The infiltration tests were performed in general accordance with the
requirements of insitu infiltration testing.
The infiltration tests were performed within 3 inch perforated pipes, 3 to 4 feet deep. The locations of the
infiltration test holes are indicated on the attached Infiltration Location Map, Plate 1. The infiltration test holes
were located by property boundary measurement on the site plan and by using geographic features. For the
continuous presoak testing method,the pipe was filled with water and allowed to stand.
After the presoak,testing was performed by adjusting the water level to near the top of the pipe. The drop in water
level was measured from a fixed initial reference point for more reliable readings, with measurements having an
accuracy of 1/8-inch. After each measurement, the water level was brought up to the original test level.
Infiltration test data recorded in the field is summarized in the following table and is included within Appendix A.
INFILTRATION TEST SUMMARY
TEST FILTRATION INFILTRATION
NUMBER HOLE DEPTH (ft.) RATE (mpi)
P-1 3.5 60 Silty SAND
P-2 3.5 60 Silty SAND
P-3 4 48 Silty SAND
P-4 3 60 Silty SAND
The infiltration test rates ranged from 48 to 60 minutes per inch (mpi).
CONCLUSIONS AND RECOMMENDATIONS
Based on the data presented in this report and the recommendations set forth herein, it is the opinion of Earth-
Strata that the retention basin can be designed for a infiltration rate of 60 mpi.
EARTH-STIRLA A, Inc. 2 May 15, 2015
Project Number 15802-12A
The following equation was used in order to convert the infiltration rates to infiltration rates.
I, _ AH (601 r
At (r+ 2Havg)
The infiltration rate of 60 mpi is to be used for the design. This rate is used in the conversion equation utilizing the
Porchet Method to obtain the infiltration rate of 0.1 inch/hour.The infiltration rate is below county standards. See
Attached Sheets.
GRADING PLAN REVIEW AND CONSTRUCTION SERVICES
This report has been prepared for the exclusive use of Providence Capital Group, LLC and their authorized
representative. It likely does not contain sufficient information for other parties or other uses. Earth-Strata should
be engaged to review the final design plans and specifications prior to construction. This is to verify that the
recommendations contained in this report have been properly incorporated into the project plans and
specifications. Should Earth-Strata not be accorded the opportunity to review the project plans and specifications,
we are not responsibility for misinterpretation of our recommendations.
Earth-Strata should be retained to provide observations during construction to validate this report. In order to
allow for design changes in the event that the subsurface conditions differ from those anticipated prior to
construction.
Earth-Strata should review any changes in the project and modify and approve in writing the conclusions and
recommendations of this report This report and the drawings contained within are intended for design input
purposes only and are not intended to act as construction drawings or specifications. In the event that conditions
encountered during grading or construction operations appear to be different than those indicated in this report,
this office should be notified immediately,as revisions may be required.
REPORT LIMITATIONS
Our services were performed using the degree of care and skill ordinarily exercised; under similar circumstances,
by reputable soils engineers and geologists, practicing at the time and location this report was prepared. No other
warranty,expressed or implied, is made as to the conclusions and professional advice included in this report.
Earth materials vary in type, strength, and other geotechnical properties between points of observation and
exploration. Groundwater and moisture conditions can also vary due to natural processes or the works of man on
this or adjacent properties. As a result, we do not and cannot have complete knowledge of the subsurface
conditions beneath the subject property. No practical study can completely eliminate uncertainty with regard to
the anticipated geotechnical conditions in connection with a subject property. The conclusions and
recommendations within this report are based upon the findings at the points of observation and are subject to
confirmation by Earth-Strata during construction. This report is considered valid for a period of one year from the
time the report was issued.
EARTH-STRATA, Inc. 3 May 15, 2015
Project Number 15802-12A
This report was prepared with the understanding that it is the responsibility of the owner or their representative,
to ensure that the conclusions and recommendations contained herein are brought to the attention of the other
project consultants and are incorporated into the plans and specifications. The owners'contractor should properly
implement the conclusions and recommendations during grading and construction, and notify the owner if they
consider any of the recommendations presented herein to be unsafe or unsuitable.
Respectfully submitted,
EARTH-STRATA, INC.
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/s!vo. 692 p i!
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4Stepen . Poole, PE 40219 *~J' ^' t
President �EL1N1`
Principal Engineer sl��FOF gA`�FpQ6'
SMP/ca
Distribution: (4)Addressee
Attachments: Figure 1 -Vicinity Map(Rear of Text)
Appendix A- Infiltration Test Sheets(Rear of Text)
Plate 1 -Infiltration Location Map(Rear of Text)
EARTFI-STRATA. Irec 4 May 15, 2015
Project Number 15802-12A
FIGURE 1
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APPENDIX A
INFILTRATION TEST SHEETS
Job No.: 15802-12A Tested By: TI "It"is the tested infiltration rate.
Job Name: providence II Time interval, Ni Initial Depth to Water,D,
Test Hole Number: P-1 Test Hole Diameter(inches): 8 Final Depth to Water,D. Total Depth of Test Hole,D 1
Soil Classification: GP Date Excavated: 4/24/2015 2Test Hole Radius,r
Test Hole Depth(ft): 3.5 Date Tested: 4/25/2015 The conversion equation Is used:
Time Interval of Presoak "Havg"is the average head height over the time interval.
Date/Time 0
Start 4/25/1511:00 Amount of Water Used/Comments It = , AN 60r
Stop 4/25/1517:00 0 At(r+2Havg)
Final Percolate Total total
Time Inftlal Water Water water nRafe Depth of 77.1 Initial Final Depthof Roduisof all 60 glut ELAPSED
71me Interval Level Dlap
(min.J Level(Irrchesl Level percoloHo interval Water Water test Xak Pere llok (nrNap)J TAf
M nHole 4l He HI Di r dH MAvg It Ahk
11:00 30 13 15 2.00 15 42.00 30.00 29.00 27.00 42.00 4.00 2.00 28.00 0.27 30.D0
11:30
11:30 30 15 17 2.00 15 42.00 30.00 27.00 25.00 42.00 4.00 2.00 26.00 0.29 60.00
12:00
12:00 30 17 18 1.00 30 42.00 30.00 25.00 24.00 42.00 4.00 1.00 24.50 0.15 90.00
12:30
12:30 30 18 19 E0.5060
42.00 30.00 24.00 23.00 42.00 4.00 1.00 23.50 0.16 120.00
1300
13: 00 30 19 19.5 42.00 30.00 23.00 22.50 42.00 4.00 0.50 22.75 0.08 150.00
1330
13:30 30 19.5 20 42.00 30.00 22.50 22.00 42.00 4.00 0.50 22.25 0.08 180.00
14:00
14:00 30 20 20.5 42.00 30.00 22.00 21.50 42.00 4.00 0.50 21.75 0.08 210.00
14:30
14:30 30 20.5 21 0.50 60 42.00 30.00 21.50 21.00 42.00 4.00 0.50 21.25 0.09 240.D0
15:00
15:00 30 21 21.5 0.50 60 42.00 30.00 21.00 20.50 42.00 4.00 0.50 20.75 0.09 270.00
15:30
15:30 30 21.5 22 0.50 60 42.00 30.00 20.50 20.00 42.00 4.00 0.50 20.25 0.D9 300.00
16:00
16:00 30 22 22.5 0.50 60 42.00 30.00 20.00 19.50 42.00 4.00 0.50 19.75 0.09 330.00
16:30
16:30 30 22.5 23 0.50 60 42.00 30.00 19.50 19.00 42.00 4.00 0.50 19.25 0.09 360.00
17:00
Job No.: 15802-12A Tested By: TI "It"is the tested infiltration rate.
Job Name: Providence II Time interval, V Initial Depth to Water,IY
Test Hole Number: P-2 Test Hole Diameter(inches): a Final Depth to Water,1) Total Depth of Test Hole.D,
Soil Classification: GP Date Excavated: 4/24/2015 Jest Hole Radius,r
Test Hole Depth(it): 3.5 Date Tested: 4/25/2015 The conversion equation is used:
Time interval of Presoak "Havg"is the average head height over the time interval.
Date/Time 0
Start 4/25/1511:01 Amount of Water Used/Comments It _ AH 60r
Stop 11251201517:01:00 PN 0 At(r@Havg)
Final percolatloI
rota
Time Initial Water Water Water n Nate Initial Final Depth of Raduks of AH 60 r)/fAt ELAPSED
'Time Interval InelOrop Water Wirter T Perc Hole (r�2HaW)) TIME
_ Nr HI AN HAvq It 41
11:01 30 14 16 2.00 15 30.00 28.00 26.00 42.00 4.00 2M 27.00 0.28 3000
11:3111:31 30 16 18 2.00 15 30.DO 26.00 24.00 42.00 4.00 2.00 25.00 0.30 60.00
12:0112:01 30 18 19.5 1.50 20 30.00 24.00 22.50 42.00 4.00 1.50 23.25 0.24 90,00
12:31
12:31 30 19.5 21 1.50 20 42.00 30.00 22.50 21.00 42.00 4.00 1.50 21.75 0.25 120.00
13:03
13:01 30 21 21.5 0.50 60 42.00 30.00 21.00 20.50 42.00 4.00 0.50 20.75 0.09 150.00
13:31
13:31 30 21.5 22 0.50 60 42.00 30.00 20.50 20.00 42.00 4.00 0.50 20.25 0.09 180.00
14:01
14:01 30 22 22.5 0.50 60 42.00 30.00 20.00 19.50 42.00 4.D0 0.50 19.75 0.09 210.00
14:31
14:31 30 22.5 23 0.50 60 42.00 30.00 19.50 19.00 42.00 4.00 0.50 19.25 0.09 240.00
15:01
15:01 30 23 23.5 0.50 60 42.00 30.00 19.00 18.50 42.00 4.00 0.50 18.75 0.10 270.00
15:31
15:31 30 23.5 24 0.50 60 42.00 30.00 18.50 18.00 42.00 4.00 0.50 18.25 0.20 300.00
16:01
16:01 30 24 24.5 0.50 60 42.00 30.00 18.00 17.50 42.00 4.00 0.50 17.75 0.10 330.00
16:31
16:31 30 24.5 25 0.50 60 42.00 30.00 17.50 17.00 42.00 4.00 0.50 17.25 0.10 360.00
17:01
Job No.: 15802-12A Tested By: TI "It"is the tested infiltration rate.
Job Name: Providence It Time interval, N1 Initial Depth to Water,I)
Test Hole Number: P-3 Test Hole Diameter(inches): 8 Final Depth to Water,1) Total Depth of Test Hole,D i
Soil Classification: GP Date Excavated: 4/24/2015 .Test Hole Radius,r
Test Hole Depth(ft): 4 Date Tested: 4/25/2015 The conversion equation is used:
Time Interval of Presoak "Havg"is the average head height over the time interval.
Date/Time 0
Start 4/25/1511:02 Amount of Water Used/Comments It _ dH 60 r
Stop 4/25/1517:02 0 6t(r+2Havg)
Final Water Percalada Total
Time Initial Water Water nRare Depths Time MINaI Fhwl Rodllb of , r//fdt EUGSEO
Time Mrerval Level(Inchesl Level L4rv�ILllap in twat Water Water It IYrt Note, Il _
Inches) 0, r dN MAvg It
11:02 30 13.5 15.5 2.00 15 48.00 30.00 34.50 32.50 48.00 4.00 2.00 33.50 0.23 30.G0
11 32
1132 30 15.5 17.5 2.00 15 48.00 30.00 32.50 30.50 48DC 4.00 2.00 31.50 0.24 60.00
12:02
12:02 30 17.5 18.25 0.75 40 48.00 30.00 30.50 29.75 48.00 4.00 0.75 30.13 0.D9 90.00
12:32
12:32 30 18.25 19 0.75 40 48.00 30.00 29.75 29.00 48.00 4.00 0.75 29.38 0.10 120.00
13:02
13:02 30 19 20 1.00 30 48.00 30.00 29.00 28.00 48.00 4.00 1.00 28.50 0.13 150.00
13:32
13:32 30 20 21 1.00 30 48.00 30.00 28.00 27.00 48.00 4.00 1.00 27.50 0.14 180.00
14:02
14:02 30 21 22 1.00 30 48.00 30.00 27.D0 26.00 48.00 4.00 1.00 26.50 0.14 210.00
14:32
14:32 30 22 23 1.00 30 48.00 30.00 26.00 25.00 48.D0 4.00 1.00 25.50 0.15 240.00
15:02
15:02 30 23 24 1.00 30 48.00 30.00 25.00 24.00 48.00 4.00 1.00 24.50 0.15 270.00
15:32
15:32 30 24 25 1.00 30 48.00 30.00 24.00 23.00 48.00 4.00 1.00 23.50 0.16 300.00
16:02
16:02 30 25 26 1.00 30 48.00 30.00 23.00 22.00 48.00 4.00 1.00 22.50 0.16 330.00
16:32
16:32 30 26 27 1.00 30 48.00 30.00 22.00 21.00 48.00 4.00 1.00 21.50 0.17 360.00
1 ::02
Job No.: 15802-12A Tested By: Tl "It"is the tested Infiltration rate.
Job Name: Providence II Time interval, %I Initial Depth to Water,1)
Test Hole Number: P-4 Test Hole Diameter(inches): 8 Final Depth to Water,I h Total Depth of Test Hole,D i
Soil Classification: GP Date Excavated: 4/24/2015 2Test Hole Radius,r
Test Hole Depth(ft) 3 Date Tested: 4/25/2015 The conversion equation is used:
rime Interval of Presoak "Havg"is the average head height over the time interval.
Date/Time 0
Start 4/25/15 11:03 Amount of Water Used/Comments AH 60 r
Stop 4/25/1517:03 0 It - At(r+2Havg)
fin WoWateral Percolatb' Total
Time Initial Water Water .Sole Thrrc lawal Final Depth./ 8adulsof AN W g1tat ELAPSEDTime Imerval Level(Inches) Level Level Drop (Mtn./Mch Teat Hole Perc Hok (02Navp)) TIME
finches)
(Inches) iMwMd&6 Dr I am N It At
11:03 30 30 13 3.00 30 36.00 30.00 26.00 23.00 36.00 4.00 3.00 24.50 0.45 30.00
21:33
11:33 30 13 15 2.00 15 36.00 30.00 23.00 21,00 36.00 4.00 2.00 22.DO 0.33 60.DO
12:03
12.03 30 15 16 1.00 30 36.00 MOD 21.00 20.00 36.00 4.00 1.DO 20.50 0.18 90.00
12:33
12:33 30 16 17 1.00 30 36.00 30.00 20.00 19.00 36.00 4.00 1.00 19.50 0.19 120.00
13:03
13:03 30 17 18 1.00 30 36.00 30.00 19.00 18.00 36.00 4.00 1.00 18.50 0.20 150.00
13:33
13:33 30 18 19 1.00 30 36.00 30.00 18.00 17.DO 36.00 4.00 1.00 17.50 0-21 180.00
14:03
14:03 30 19 19.5 0.50 60 36.00 30.00 17.00 16.50 36.00 4.00 0.50 16.75 0.11 210.00
14:33
14:33 30 19.5 20 0.50 60 36.00 30.00 16.50 16.00 36.00 4.00 0.50 16.25 0.11 240.00
15:03
15:03 30 20 20.5 0.50 60 36.00 30.00 16.00 15.50 36.00 4.00 0.50 25.75 0.11 270.00
15:33
15:33 30 20.5 21.5 1.00 30 36.00 30.00 15.50 14.50 36.00 4.00 1.00 15.00 0.24 300.00
16:03
16:03 30 20.5 22 1.50 20 36.00 30.00 15.50 14.00 36.00 4.00 1.50 14.75 0.36 330.00
16:33
16:33 30 22 22.5 0.50 60 36.00 30.00 14.00 13.50 36.00 4.00 0.50 13.75 0.13 360.00
17:03