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PETRA
OFFICES THROUGHOUT SOUTHERN CALIFORNIA
' June 20, 2002
J.N. 119-02
BGR 011201
' THE GARRETT GROUP, LLC
43529 Ridge Park Drive
Temecula, California 92590
Attention: Mr. John Leway
' Subject: Response to Riverside County Building and Safety Department Plan
Check Corrections Review Sheet, Dated January 14, 2002,
Tract 29734, Temecula Area of Riverside County, California
Petra Geotechnical, Inc. (Petra) has prepared this response to the subject Riverside
County Building and Safety Department geotechnical report review sheet for
' Tract 29734 located in the Temecula area of Riverside County, California. The
following response provides the specific review-sheet comments with a point-by-point
response to each item by Petra. A copy of the original review sheet is also included
at the end of this report for your convenience.
RESPONSE TO RIVERSIDE COUNTY
• PLAN CHECK CORRECTIONS REVIEW SHEET
• Item No. 047 — "Slope stability report is required for cut and fill slopes
constructed steeper than 2 horizontal to 1 vertical or cut and fill slopes constructed
over 30 feet in height. Submit slope stability report as indicated below: <0457>
' "CONFIRM HEIGHT OF EASTERLY SIDE OF OFFSITE SLOPE ADJACENT
TO LOT 17. SLOPES CONSTRUCTED OVER 30 FEET IN HEIGHT REQUIRE
' SLOPE STABILITY REPORT."
Response—Petra has reviewed the rough-grading plan for Tract 29734, prepared
' by TransPadific Consultants, which was date-stamped April 8, 2002. The existing
descending slope situated behind Lots 17 and 18 was constructed during the rough
grading of Tract 23064-2 in 1997 (Petra, 1997c). The portion of the slope in
' PETRA GEOTECHNICAL, INC.
41640 Corning Place • Suite 107 • Murrieta • CA 92562 • Tel: (909) 600-9271 • Fax: (909) 600-9215
1
THE GARRETT GROUP, LLC June 20, 2002
TR 29734/Temecula Area J.N. 119-02
Page 2
' question constitutes the southern end of a variable-height descending 2:1
(horizontal:vertical) fill slope constructed adjacent to Lots 31 through 42 of
Tract 23064-2. The fill slope transitions to a natural slope at its southern terminus.
' The rough-grading plan for Tract 23064-2, prepared by Ranpac Engineering and
dated May 21, 1997, indicates that the slope attained a localized maximum height
' of approximately 65 feet at the time of construction. Subsequent to the mass-
grading of Tract 29734, the maximum slope height has been reduced to
approximately 45 feet.
Based on geologic mapping of the west-facing cut slope at the rear of Lots 17
through -• _ . . -. • ..Is
‘Issaralks 19 of Tract 29734, the offsite slope behind Lots 17 and 18 is underlain
by sandstone and silty sandstone/sandy siltstone bedrock of the Pauba Formation.
A gradational contact between the sandstone and sandstone/siltstone in noted in
' Cross-Section A-A' (Figure 2),depicted by the apparent dip of the mapped bedding
and shear-surface attitudes observed in the cut slope behind Lots 17 through 19 of
Tract 29734. As indicated in the aforementioned rough-grading plan for
Tract 23064-2, the slope face has been constructed a fill slope, presumably
equipment-width in thickness.
Both gross- and surficial-stability analyses have been performed for the slope
represented in Cross-Section A-A'. Soil and bedrock strength parameters deemed
representative of the site conditions were utilized in the static and seismic analyses
of global (gross) stability using the computer program GSTABL7 by Garry H.
Gregory, P.E. Based on the Modified Bishop Method of analysis, acceptable factors
of safety of 2.11 and 1.49, for static and pseudo-static (seismic) conditions were
obtained. Analytical results are presented in Appendix A.
In addition to global stability, the surficial stability of the slope was analyzed, using
the infinite-slope method. This method assumes a slope of infinite height, saturated
to a vertical depth of 4 feet below the slope face. The results of the analysis,
presented in Appendix A, indicated an acceptable factor of safety of 1.8.
' This report has not been prepared for use by parties or projects other than those named
or described above. It may not contain sufficient information for other parties or other
purposes.
77e 97._? 0
I
THE GARRETT GROUP, LLC June 20, 2002
TR 29734/Temecula Area J.N. 119-02
I
Page 3
I The professional opinions contained herein have been derived in accordance with
current standards of practice and no warranty is expressed or implied.
We appreciate this opportunity to be of service. If you have any questions, please
Icontact this office.
Respectfully submitted,
IPETRA GEOTECHNICAL, INC. p PaoFEss;
e ,
I �c ',tsoN A i -`
��G�NEERING /. VPP \,F'\
��� rG< L . ti t '� cc No.871 53 .
`� 2�• '0, e fi ins Gra son R. Walk t* EXp 3
' Q I- No. 76 d$ • ssot�e Geologist Senior Associate S g 1r ag ; ) r;
'' Exp. t7 162 GE 871 sy ' /
1tir;tGl>
Is�NTFOFCAt-tom, ' /TLJ/keb G1
Attachments: Riverside County Review Sheet
Figure I - Geologic Map
Figure 2 - Cross-Section A-A'
References
Appendix A - Slope-Stability Analyses
I Distribution: (4) Addressee
(2) Riverside County Building and Safety
Attention: Mr. Mack Hakakian
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COUNTY OF RIVERSIDE
` ; j_r � TRANSPORTATION ANDg1." �•
LAND MANAGEMENT AGENCY • d �
°"1,
*�'e Building and Safety Department
I
T. H. Ingram
Director
DATE: January 14,2002
TO THE APPLICANT:
I The following list of corrections needs your attention and follow-up.Please revise the plans and supporting
calculations, if any, and resubmit these recheck including a correction response. Indicate on the corrected
plan where the corrections are made and clearly distinguish all revisions using clouds,revision triangles,etc.
Iso plan check can be accomplished in a timely manner.
BUILDING AND SAFETY, GRADING DIVISION
» PLAN CHECK CORRECTIONS «
• SITE : TR29734 LOTS 1-43 • P/C LOG# : BGR 011201
I • COUNTY GRADING CONTACT: • PREPARED BY:
Abdul Behnawa, P.E. Michael Eby, P.E.
Senior Civil Engineer Geopacifica
Phone: (909)600-6119 3060 Industry Street, Suite 105
I
Oceanside,CA 92054-4859
Phone: (760)721-5488
Fax: (760) 721-5539
GENERAL.
002 Obtain Flood Control approval before a grading permit will be issued. <CONDITION>
I60.FLOOD RI. 1
I 003 Obtain Transportation Department approval before a grading permit will be issued. <CONDITION>
MAY ALSO REQUIRE TRANSPORTATION DEPARTMENT APPROVAL FOR EXPORT HAUL
I
ROUTE.
004 Obtain Planning Department approval before a grading permit will be issued. <CONDITION>
County of Riverside,South County Office 0 39493 Los Alamos Road,Suite A
I 0 Murrieta,California 92563
0 Phone: (909)600-6100 000Fax: (909)600-6145
RevPlanCheckTemplatei.doc I
I
5
I
' DAYLIGHT CONNECTIONS OF PROPOSED GRADES CORRECTLY MATCH
CORRESPONDING EXISTING GRADES.
I
17 • Slope stability report is required for cut and fill slopes constructed steeper than 2 horizontal to I
I vertical or cut and fill slopes constructed over 30 feet in height. Submit slope stability report as
indicated below: <0457>
. CONFIRM HEIGHT OF EASTERLY SIDE OF OFFSITE SLOPE ADJACENT TO LOT 17.
ISLOPES CONSTRUCTED OVER 30 FEET IN HEIGHT REQUIRE SLOPE STABILITY REPORT.
068 Construction activities including but not limited to clearing, grading or excavation of land, which.,
disturbs 5 acrcs or more, or on sites which arc part of a larger common plan of development which
disturbs 5 acres or more are required to comply with the National Pollutant Discharge Elimination
I System (NPDES) and shall bcfore grading permit to submit the following:
A. A copy of the Notice of Intent (NOI) filed with the State Water Resources Control Board
(SWRCB) including discharger's identification number.
I B. The name, address and phone number (including 24-hour emergency phone number) of the
person responsible for implementing,inspecting and reporting of the site Storm Water Pollutant
I Prevention Plan.(SWPPP). Any change of such person, address or phone number shall be filed
within 24 hours with the Department of Building and Safety and shall include the grading log
number.
IFull text of NPDES requirements are available from the County.
I 083 Bond is required prior to grading permit. Contact Steve Dondalski or Nan Williams at phone (909)
955-2020. <0457>
I 084 Bonds and erosion landscape plans are required prior to grading permit. Contact Steve Dondalski or
Nan Williams at phone(909)955-2020.
' C,RADING:
I 020 Provide street names, edge of pavement, right of way dimension, direction of flow, and grades of
streets and TC/FL elevations as indicated below: <B3309>
SHOW FLOW ARROWS ALONG CURB LINES AND LABEL ALL HIGH POINTS..
I
021 B3309>
Show original ground contours as indicated below: <
I
County of Riverside, South County Office 0 39493 Los Alamos Road, Suite A
0 Murrieta.California 92563
0 Phone: (909) 600-6100 000Fax: (909)600-6145
Rc PlanCheckTemplarel.doc 3
. EXPLANATION
- ,t.V t ((LOCATIONS ARE APPROXIMATE)
I
�' 4 ',4?-_,. ..A.14 4 ',tAZ--.7.1„_!:41;01t a 1 C ARTIFICIAL FILL, COMPACTED
,gym. ttr p.F. ':i Y
r'£eStall'r,u -' ,r Y;j ;y '' ,'i` i`i. Qps QUATERNARY PAUBA FORMATION
�cfi ` tt ,G lit j f" SANDSTONE
P d gg
T 44
.Y'.
) 4 -2,
i Ara,`. r? - �� GEOLOGIC CONTACT
i V Qps 4 t�, " ,A A;
Po-fit t ,3 t y.' , GEOLOGIC CROSS SECTION
® w
w
1 1 7 ,. v a4 .zi � 50 BEDDING ATTITUDE
44
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GEOTECHNICAL MAP
I '10,45PETRA GEOTECHNICAL, INC.
I . Scale
0 40 Feet JN 165-01 JUNE,2002
FIGURE 1
I
inn n me mean n n o a a a a a se a
. .
cc
AU,m A
2 EXISTING
1240— FEI°m GROUND •
L, SURFACE —1240
LOT 18 `
,(6'WIDEDRAIN TERRACE
afc
Z—•-• afc GOLF COURSE
1200- I
1200
F-
W H
\ W
W W
W
Z Qps (SANDSTONE) LLZ
6 1160- ` - 1160 ZO
W >
JW
W "•-..,_, J
-N--%.„.
W
1120- t ~ - 1120
Qps (SANDSTONE/SILTSTONE) z\_
•
1080— —1080
CROSS SECTION A-A'
0 PETRA GEOTECHNICAL, INC.
JN 165-01 JUN.,2002
• FIGURE 2 .
t
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' REFERENCES
' Earth Research Associates, Inc., 1987, Evaluation of Faulting and Liquefaction Potential, Portion of Wolf Valley
Project, Rancho California, County of Riverside,California, J.N. 298-86, dated November 20, 1987.
' , 1988, Preliminary Soils Engineering and Engineering Geologic Investigation, Red Hawk Project, Rancho
California Area, County of Riverside,California, J.N. 298-87,dated February 2, 1988.
, 1989, Supplemental Soils Engineering and Engineering Geologic Investigation,Portion of Redhawk Project,
' Vesting Tentative Tract map Nos.23064, 23065,23066 and 23067, Rancho California,County of Riverside,
California, J.N. 298-87, dated May 8, 1989.
' Petra Geotechnical, Inc., 1989a, Supplemental Evaluation of Faulting, Southwest Portion of Redhawk Project,Rancho
California Area, County of Riverside,California,J.N. 298-87,dated March I, 1989.
, 19896,Supplemental Soils Engineering and Engineering Geologic Investigation,Portion of Redhawk Project,
Vesting Tentative Tract Map Nos.23064,23065,23066 and 23067, Rancho California, County of Riverside,
California,Volumes I and II, J.N. 298-87, dated May 8, 1989.
' , 1997a, Summary of Interim Fault Evaluation Report, Model Lot Complexes, Tract 23064, Phase I and
Phase 2,Redhawk Development,Riverside County, California;for Redhawk Homebuilding Partnership LTD,
J.N. 569-96, dated April 8, 1997.
' , 19976, Revised Supplemental Fault Evaluation, Tract 23064-1, 23064-2 and 23064-3, Redhawk
Development, County of Riverside, California, J.N. 569-96, dated July 22, 1997. •
' , 1997c, Geotechnical Report of Rough Grading, Lots 6, 7, 13 through 48, 53 through 66 and 68 through 84
(Construction Phase 2)Tract 23064-2,Redhawk Development,County of Riverside, California;for Redhawk
Homebuilding Partnership LID,J.N. 569-96,dated October 24, 1997.
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' PETRA GEOTECHNICAL, INC. JUNE 2002
J.N. 119-02
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APPENDIX A
1
SLOPE STABILITY ANALYSIS
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a a a S I IIIb la MB OM a IIIb a a a a I a I a
Tract 29734, Lots 17/18 Off-Site Slope (Static)
C:1STEDWIN\PROJEC-1\43601 ST1.PL2 Run By: Petra Geotechnical, Inc. 06/10/2002 9:28AM
1290
'nit Points:24.to 52.
# FS Soil Soil Total Saturated Cohesion Friction Pore Pressure Piez. i "
a 2.11 Desc. Type Unit Wt. Unit Wt. Intercept Angle Pressure Constant Surface Term Limits: 120.to 290.
b 2.13 No. (pcf) (pcf) (psf) (deg) Param. (psf) No.
c 2.13 Fill 1 130.0 130.0 240.0 32.0 0.00 0.0 0
d 2.13 Qps-ss 2 130.0 130.0 200.0 32.0 0.00 0.0 0
e 2.15 Qps-slt 3 130.0 130.0 480.0 30.0 0.00 0.0 0
f 2.15 a
g 2.15 ecY{�
1240 --11`2.16 It -
i 2.17
j 2.17 6 r R
2 9 10
2 3
•
5
1190 1\ 1 � �- �//
2
TJ 3
\� 4,3
\V 1140
( ,V`
vV
1090 -
ii h
ii
ii i
1040 : i
0 50 100 150 200 250 300 350
. GSTABL7 FSmin=2.11
Safety Factors Are Calculated By The Modified Bishop Method
l� l� MB a r a a 1 a a a a I OM Oa
•
Tract 29734, Lots 17/18 Off-Site Slope (Static)
1290 C:\STEDWIN\PROJEC-1\43601 ST1.PLO Geometry Preview 06/10/2002 9:29 AM
Soil Soil Total Saturated Cohesion Friction Pore Pressure Piez. Inn Points:24:to 52.
Desc. Type Unit Wt. Unit Wt. Intercept Angle Pressure Constant Surface Term Limits: 120.to 290.
No. (pcf) (pcf) (psf) (deg) Param. (psf) No.
Fill 1 130. 130. 240. 32. 0. 0. 0
Qps-ss 2 130. 130. 200. 32. 0. 0. 0
Qps-slt 3 130. 130. 480. 30. 0. 0. 0
1240 — —
6 / Termination Limits
2 2 9 10
2 3
5
/ 20 Initiation P.'• —- 2
1
1
1190 --- -
2,.
15
3
1140 Min.Surface Elevation 1140
1090
Segment Len.-410.0 ft
1040
0 50 100 150 200 250 300 350
•
II
C:\stedwin\projec-1\43601stl.OUT Page 1
*+* GSTABL7 **+
** GSTABL7 by Garry H. Gregory, P.E. **
' ** Version 1.0, January 1996; Version 1.14, Sept 1999 **
--Slope Stability Analysis--
Simplified Janbu, Modified Bishop
or Spencer's Method of Slices
II
(Based on STABL6-1986, by Purdue University)
Run Date: 06/10/2002
Time of Run: 9:28AM
Run By: Petra Geotechnical, Inc.
I/
'Input Data Filename: C:43601st1.
Output Filename: C:43601st1.OUT
Unit System: English •
Plotted Output Filename: C:43601stl.PLT
PROBLEM DESCRIPTION Tract 29734, Lots 17/18
II
Off-Site Slope (Static)
BOUNDARY COORDINATES
Note: User origin value specified.
Add 0.00 to X-values and 1040.00 to Y-values listed.
II10 Top Boundaries
15 Total Boundaries
Boundary X-Left Y-Left X-Right Y-Right Soil Type
II
No. (ft) (ft) (ft) (ft) Below Bnd
1 0.00 160.00 12.00 158.00 1
2 12.00 158.00 24.00 153.00 1
3 24.00 153.00 36.00 153.00 1
II
4 36.00 153.00 52.00 160.00 1
5 52.00 160.00 80.00 170.00 1
6 80.00 170.00 135.00 196.00 1
7 135.00 196.00 141.00 193.00 2
i 8 141.00 193 .00 176.00 177.00 2
9 176.00 177.00 272.00 177.00 2
10 ,272.00 177.00 350.00 177.00 3
11 24 .00 150.00 42.00 150.00 2
12 42.00 150.00 64.00 160.00 2
I
13 64.00 160.00 92.00 170.00 2
14 92.00 170.00 141.00 193.00 2
15 0.00 53.00 284.00 177.00 3
ISOTROPIC SOIL PARAMETERS
II
3 Type(s) of Soil '
Soil Total Saturated Cohesion Friction Pore Pressure Piez.
Type Unit Wt. Unit Wt. Intercept Angle Pressure Constant Surface
No. (pcf) (pef) (psf) (deg) Param. (psf) No.
II
1 130.0 130.0 240.0 32.0 0.00 0.0 0
2 130.0 130.0 200.0 32.0 0.00 0.0 0
3 130.0 130.0 460.0 30.0 0.00 0.0 0
A Critical Failure Surface Searching Method, Using A Random
II
Technique For Generating Circular Surfaces, Has Been Specified.
1000 Trial Surfaces Have Been Generated.
50 Surfaces Initiate From Each Of 20 Points Equally Spaced
Along The Ground Surface Between X = 24.00(ft)
and X = 52.00(ft)
II
Each Surface Terminates Between X = 120.00(ft)
and X = 290.00(ft)
Unless Further Limitations Were Imposed, The Minimum Elevation
At Which A Surface Extends Is Y =100.00(ft)
ll
10.00(ft) , Line Segments Define Each Trial Failure Surface.
Restrictions Have Been Imposed Upon The Angle Of Initiation.
The Angle Has Been Restricted Between The Angles Of -30.0
And 20.0 deg.
II
Following Are Displayed The Ten Most Critical Of The Trial
Failure Surfaces Examined. They Are Ordered - Most Critical
First.
* * Safety Factors Are Calculated By The Modified Bishop Method * *
II
Failure Surface Specified By 13 Coordinate Points
Point X-Surf Y-Surf
II ,L;
II
IIC:\stedwin\projec-1\43601st1.OUT Page 2
No. (ft) (ft)
1 35.79 153.00
' 2 45.79 152.89
3 55.77 153.47
4 65.69 154.74
5 75.50 156.70
' 6 85.15 159.32
7 94.59 162.61
8 103.79 166.55
9 112.69 171.11
10 121.25 176.27
II
11 129.43 182.01
12 137.20 188.31
13 141.83 192.62
Circle Center At X = 42.4 ; Y = 297.4 and Radius, 144.5
II
*** 2.111 ***
Individual data on the 20 slices
Water Water Tie Tie Earthquake
Force Force Force Force Force Surcharge
' Slice Width Weight Top Bot Norm Tan Igor Ver Load
No. (ft) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs)
1 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
2 9.8 2796.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0
II 3 2.9 1897.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0
4 3.3 2599.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0
5 3.8 3585.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 .
6 8.2 9430.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0
' 7 1.7 2188.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0
8 9.8 13923.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0
9 4 .5 6955.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0
10 5.1 8426.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0
11 6.9 12058.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
II 12 2.6 4757.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0
13 9.2 17320.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0
14 8.9 16801.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0
15 8.6 15349.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0
II
16 8.2 13081.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0
17 5.6 7536.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
18 2.2 2301.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0
19 3.8 1910.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0
ll 20 0.8 62.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Failure Surface Specified By 13 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
ll 1 41.68 155.49
2 51.65 154.69
3 61.65 154.73
4 71.61 155.63
' S 81.46 157.37
6 91.13 159.93
7 100.54 163.31
8 109.63 167.47
9 118.34 172.39
II 10 126.59 178.03 •
11 134.34 184.35
12 141.53 191.31
13 142.43 192.34
' Circle Center At X = 56.1 ; Y = 272.4 and Radius, 117.8
*** 2.133 ***
Failure Surface Specified By 14 Coordinate Points
Point X-Surf Y-Surf
II No. (ft) (ft)
1 31.37 153.00
2 41.26 151.54
3 51.24 150.94
II 4 61.24 151:19
5 71.18 152.30
/4/
II
' C:\stedwin\projec-1\43601st1.0UT Page 3
6 80.99 154.26
7 90.59 157.05
IC 99.92 160.65
9 108.90 165.04
10 117.48 170.18
11 125.58 176.05
' 12 133.15 182.58
13 140.13 189.74
14 142.32 192.40
Circle Center At X = 53.3 ; Y = 267.1 and Radius, 116.2
***
II 2.135 ***
Failure Surface Specified By 14 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 34 .32 153.00
II
2 44 .27 152.01
3 54 .27 151.82
4 64 .25 152.41
5 74 .15 153.79 .
II 6 83 .92 155.96
7 93.48 158.88
8 102.78 162.56
9 111.76 166.96
' 10 120.36 172.05
11 128.54 177.81
12 136.23 184.20
13 143.39 191.18
' 14 143.85 ***191.70
Circle Center At X = 51.8 ; Y = 278.0 and Radius, 126.2
*** 2.135
Failure Surface Specified By 13 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 34.32 153.00
2 44.26 151.95
3 54.26 151.86
ll 4 64.22 152.71
5 74.06 154 .50
6 83.68 157.23
7 93.01 160.85
' 8 101.94 165.34
9 110.41 170.66
10 118.33 176.76
11 125.64 183.59
12 132.27 191.07
13 135.63 195.69
Circle Center At X = 50.3 ; Y = 257.0 and Radius, 105.2
*** 2.146 ***
' Failure Surface Specified By 13 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 40.21 154.84
2 50.08 153.26
II
3 60.07 152.66
4 70.06 153.04
5 79.97 154.41
6 89.69 156.75
7 99.13 160.04
8 108.21 164 .24
9 116.82 169.32
10 124.90 175.22
II 11 132.35 181.88
12 139.11 189.25
13 141.68 192.69
Circle Center At X = 61.2 ; Y = 253.9 and Radius, 101.3
' *** 2.148 ***
Failure Surface Specified By 13 Coordinate Points
4
II
' C:\stedwin\projec-1\43601st1.OUT Page 4
Point X-Surf Y-Surf
No. (ft) (ft)
II 1 38.74 154 .20
2 48.55 152.29
3 58.52 151.46
4 68.52 151.73
' S 78.42 153.08
6 88.13 • 155.50
7 97.51 158.96
8 106.46 163.42
9 114.87 168.82
II 10 122.64 175.12
11 129.69 182.21
12 135.92 190.04
13 138.56 194.22
II
Circle Center At X = 61.1 ; Y = 243.2 and Radius, 91.8
*** 2 .154 *** •
Failure Surface Specified By 14 Coordinate Points
Point X-Surf Y-Surf
' No. (ft) (ft)
1 24.00 153.00
2 33.83 151.17
3 43.78 150.19
11 4 53.78 150.07
•
5 63.75 150.81
6 73.63 152.41
7 83.32 154 .86
' 8 92.77 158.13
9 101.90 162.21
10 110.65 167.06
11 118.94 172.64
I
12 126.73 178.92
13 133.94 185.85
14 140.45 193.28
Circle Center At X = 50.2 ; Y = 265.9 and Radius, 115.9
*** 2.156 ***
II Failure Surface Specified By 12 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 47.56 158.07
' 2 57.58 158.27
3 67.53 159.19
4 77.40 160.84
5 87.12 163.20
II 6 96.64 166.25
7 105.91 169.99
8 114.89 174.40
9 123.52 179.44
' 10 131.77 185.10
11 139.58 191.34
12 141.25 192.89
Circle Center At X = 49.9 ; Y = 295.2 and Radius, 137.2 • •
*** 2.168 ***
I
Failure Surface Specified By 14 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 29.90 153.00
II 2 39.84 151.96
3 49.84 151.64
4 59.83 152.05
5 69.76 153 .19
I
6 79.59 155.04
7 89.25 157.61
8 98.71 160.87
9 107.90 164 .81
II 10 116.77 169.42
11 125.30 174 .65
II /
1
C:\stedwin\projec-1\43601st1.OUT Page 5
12 133.41 180.49
13 141.08 186.91
. 14145.33 191.02
Ce
Circle Center At X = 49.2 Y = 288.5 and Radius, 136.9
*
2.168 ***
1
1
1
i
1
1
1
Al
i i i i i i i i i a• i i i i i i i i i
•
•
Tract 29734, Lots 17/18 Off-Site Slope (Seismic) •
1290 C:\STEDWIN\PROJEC-1\43601SS1.PL2 Run By: Petra Geotechnical, Inc. 06/10/2002 9:27AM
# FS Soil Soil Total Saturated Cohesion Friction Pore Pressure Piez.i Load Value: !nit Points:24.to 52.
a 1.49 Desc. Type Unit Wt. Unit Wt. Intercept Angle Pressure Constant Surface Horiz Eqk 0.150 g< Term Limits: 120.to 290.
b 1.50 No. (pcf) (pcf) (psf) (deg) Param. (psf) No.
c 1.50 Fill 1 130.0 130.0 240.0 32.0 0.00 0.0 0
d 1.50 Qps-ss 2 130.0 130.0 200.0 32.0 0.00 0.0 0
e 1.51 Qps-slt 3 130.0 130.0 480.0 30.0 0.00 0.0 0
f 1.51 a
g 1.52
1240 - h- 1.52 ' -
E,
i 1.52
j 1.52 6 .
2 9 0
2 3 •
S
1190 1
2
•
3
1140 -
•
1090 ' -
•
•
•
1040 •
• 0 50 100 150 200 250 300 350
GSTABL7 FSmin=1.49
PETRA Safety Factors Are Calculated By The Modified Bishop Method
00
1111111 a NM SOB 611111 11•11 11111 NM UM MINI 811111 a 1E111 Ma Si 111111,
Tract 29734, Lots 17/18 Off-Site Slope (Seismic)
1290 C:\STEDWIN\PROJEC-1\43601SS1.PLO Geometry Preview 06/10/2002 9:28 AM
Soil Soil Total Saturated Cohesion Friction Pore Pressure Piez.
Mit Points:24.to 52.
Desc. Type Unit Wt. Unit Wt. Intercept Angle Pressure Constant Surface Term Limits: 120.to 290.
No. (pcf) (pcf) (psf) (deg) Param. (psf) No.
Fill 1 130. 130. 240. 32. 0. 0. 0
Qps-ss 2 130. 130. 200. 32. 0. 0. 0
Qps-slt 3 130. 130. 480. 30. 0. 0. 0
1240 •- -
6 4 Termination Limits
2 2 0
9 • •
2 3
5
/ 20 Initiation P.., = 2
1
1190 1
2 _
•
'V /5
"''�VVII 3
b1140 - Min. Surface Elevation 1140
V
1090
Segment Len.=10.0 ft
1040 1 1
0 50 100 150 200 250 300 350
PETRA
IC:\stedwin\projec-1\43601ss1.OUT Page 1
*** GSTABL7 ***
** GSTABL7 by Garry H. Gregory, P.E. **
' ** Version 1.0, January 1996; Version 1.14, Sept 1999 **
--Slope Stability Analysis--
Simplified Janbu, Modified Bishop
or Spencer's Method of Slices
II (Based on STABL6-1986, by Purdue University)
Run Date: 06/10/2002
Time of Run: 9:27AM
Run By: Petra Geotechnical, Inc.
' Input Data Filename: C:93601ss1.
Output Filename: C:43601ss1.0UT
Unit System: English
Plotted Output Filename: C:43601ss1.PLT
PROBLEM DESCRIPTION Tract 29734, Lots 17/18
II Off-Site Slope (Seismic)
BOUNDARY COORDINATES
Note: User origin value specified.
Add 0.00 to X-values and 1040.00 to Y-values listed.
II10 Top Boundaries
15 Total Boundaries
Boundary X-Left Y-Left X-Right Y-Right Soil Type
I
No. (ft) (ft) (ft) (ft) Below Bnd
1 0.00 160.00 12.00 158.00 1
2 12.00 158.00 24 .00 153.00 1
3 24 .00 153.00 36.00 153.00 1
' 4 36.00 153.00 52.00 160.00 1
5 52.00 160.00 80.00 170.00 1
6 80.00 170.00 135.00 196.00 1
7 135.00 196.00 141.00 193.00 2
IS 141.00 193.00 176.00 177.00 2
9 176.00 177.00 272.00 177.00 2
10 272.00 177.00 350.00 177.00 3
11 24.00 150.00 42.00 150.00 2
12 42.00 150.00 64.00 160.00 2
II 13 64.00 160.00 92.00 170.00 2
14 92.00 170.00 141.00 193.00 2
15 0.00 53.00 284 .00 177.00 3
ISOTROPIC SOIL PARAMETERS
II 3 Type(s) of Soil
Soil Total Saturated Cohesion Friction Pore Pressure Piez.
Type Unit Wt. Unit Wt. Intercept Angle Pressure Constant Surface
No. (pcf) (pcf) (psf) (deg) Param. (psf) No.
I 1 130.0 130.0 240.0 32.0 0.00 0.0 0
2 130.0 130.0 200.0 32.0 0.00 0.0 0
3 130.0 130.0 480.0 30.0 0.00 0.0 0
A Horizontal Earthquake Loading Coefficient
II Of0.150 Has Been Assigned
A Vertical Earthquake Loading Coefficient
0f0.000 Has Been Assigned
Cavitation Pressure = 0.0(psf)
' A Critical Failure Surface Searching Method, Using A Random
Technique For Generating Circular Surfaces, Has Been Specified.
1000 Trial Surfaces Have Been Generated.
50 Surfaces Initiate From Each Of 20 Points Equally Spaced
Along The Ground Surface Between X = 24.00(ft)
ll
and X = 52.00(ft)
Each Surface Terminates Between X = 120.00(ft)
and X = 290.00(ft)
Unless Further Limitations Were Imposed, The Minimum Elevation
II At Which A Surface Extends Is Y =100.00(ft)
10.00(ft) Line Segments Define Each Trial Failure Surface.
Restrictions Have Been Imposed Upon The Angle Of Initiation.
The Angle Has Been Restricted Between The Angles Of -30.0
And 20.0 deg.
Following Are Displayed The Ten Most Critical Of The Trial
' • Pt
II
' C:\stedwin\projec-1\43601ss1.OUT Page 2
Failure Surfaces Examined. They Are Ordered - Most Critical
First.
' * * Safety Factors Are Calculated By The Modified Bishop Method * *
Failure Surface Specified By 13 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
' 1 35.79 153.00
2 45.79 152.89
3 55.77 153.47
4 65.69 154.74
5 75.50 156.70
II
6 85.15 159.32
7 94.59 162.61
8 103.79 166.55
9 112.69 171.11
' 10 121.25
129.43 176.27
11 182.01
12 137.20 188.31
13 141.83 192.62
' Circle Center At X = 42.4 ; Y = 297.4 and Radius, 144.5
*** 1.486 ***
Individual data on the 20 slices
Water Water Tie Tie Earthquake
' Force Force Force Force Force Surcharge
Ver
Slice Width Weight Top Bot Norm Tan for Load
No. (ft) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs)
1 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
' 2 9.8 2796.4 0.0 0.0 0.0 0.0 419.5 0.0 0.0
3 2.9 1897.4 0.0 0.0 0.0 0.0 284.6 0.0 0.0
4 3.3 2599.6 0.0 0.0 0.0 0.0 389.9 0.0 . 0.0
5 3.8 3585.4 0.0 0.0 0.0 0.0 537.8 0.0 0.0
6 8.2 9430.3 0.0 0.0 0.0 0.0 1414.5 0.0 0.0
7 1.7 2188.3 0.0 0.0 0.0 0.0 328.2 0.0 0.0
8 9.8 13923.1 0.0 0.0 0.0 0.0 2088.5 0.0 0.0
9 4.5 6955.4 0.0 0.0 0.0 0.0 1043.3 0.0 0.0
10 5.1 8426.4 0.0 0.0 0.0 0.0 1264.0 0.0 0.0
' 11 6.9 12058.0 0.0 0.0 0.0 0.0 1808.7 0.0
0.0 0.0
12 2.6 4757.7 0.0 0.0 0.0 0.0 713.6 0.0
13 9.2 17320.3 0.0 0.0 0.0 0.0 2598.1 0.0 0.0
14 8.9 16301.7 0.0 0.0 0.0 0.0 2520.2 0.0 0.0
II 15 8.6 15349.1 0.0 0.0 0.0 0.0 2302.4 0.0 0.0
16 8.2 13081.4 0.0 0.0 0.0 0.0 1962.2 0.0 0.0
17 5.6 7536.0 0.0 0.0 0.0 0.0 1130.4 0.0 0.0
18 2.2 2301.1 0.0 0.0 0.0 0.0 345.2 0.0 0.0
' 19 3.8 1910.1 0.0 0.0 0.0 0.0 286.5 0.0 0.0
20 0.8 62.1 0.0 0.0 0.0 0.0 0.0 0.0
Failure Surface Specified By 14 Coordinate Points 9.3
Point X-Surf Y-Surf
No. (ft) (ft)
II
1 34.32 153.00
2 44.27 152.01
3 54.27 151.82
4 64 .25 152.41
' S 74.15
83.92 153.79
6 155.96
7 93.48 158.88
8 102.78 162.56
I
9 111.76
120.36 166.96
10 172.05
11 128.54 177.81
12 136.23 184.20
I13 143.39
143.85 191.18
14 191.70
Circle Center At X = 51.8 ; Y = 278.0 and Radius, 126.2
*** 1.498 ***
' Failure Surface Specified By 13 Coordinate Points
Point X-Surf Y-Surf
I
020
•
II
' No. (ft) (ft) C:\stedwin\projec-1\43601ss1.OUT Page 3
1 41.68 155.49
' 2 51.65 154.69
3 61.65 154.73
4 71.61 155.63
5 81.46 157.37 .
6 91.13 159:93
II
7 100.54 163.31
8 109.63 167.47
9 118.34 172.39
10 126.59 178.03
'
11 134.34 184.35
12 141.53 191.31
13 142.43 192.34
Circle Center At X = 56.1 ; Y = 272.4 and Radius, 117.8
1 *** 1.502 *** •
Failure Surface Specified By 14 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
' 1 31.37 153.00
2 41.26 151.54
3 51.24 150.94
4 61.24 151.19
' 5 71.18 152.30
6 80.99 154.26
7 90.59 157.05
8 99.92 160.65
9 108.90 165.04
II 10 117.48 170.18
11 125.58 176.05
12 133.15 182.58
13 140.13 189.74
II
14 142.32 192.40
Circle Center At X = 53.3 ; Y = 267.1 and Radius, 116.2
*** 1.504 ***
Failure Surface Specified By 14 Coordinate Points
II Point X-Surf Y-Surf
No. (ft) (ft)
1 29.90 153.00
2 39.84 151.96
ll 3 49.84 151.64
4 59.83 152.05
5 69.76 153.19
6 - 79.59 155.04
ll7 89.25 157.61
8 98.71 160.87 •
9 107.90 164.81
10 116.77 169.42
11 125.30 174.65
II 12 133.41 180.49
13 141.08 186.91
14 145.33 191.02 •
Circle Center At X = 49.2 ; Y = 288.5 and Radius, 136.9
' *** 1.512 ***
Failure Surface Specified By 14 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
' 1 34 .32 153.00
2 44 .30 152.46
3 54.30 152.59
4 64.27 153.38
II 5 74.16 154.83
6 83.94 156.93
7 93.56 159.68
8 102.97 163.06
II9 112.13 167.06
10 121.01 171.66
IIA
1 A
II
I . 11 129.57 176.83 C:\stedwin\projec-1\43601ssl.OUT Page 4
12 137.76 182.57
' 13 145.55 188.83
14 147.07 190.23
Circle Center At X = 47.4 ; Y = 302.6 and Radius, 150.2
*** 1.514 ***
Failure Surface Specified By 13 Coordinate Points
II
Point X-Surf Y-Surf
No. (f t) (ft)
1 40.21 154.84
2 50.08 153.26
' 3 60.07 152.66
4 70.06 153.04
5 79.97 154.41
6 89.69 156.75
II 7 99.13 160.04
8 108.21 164.24
9 116.82 169.32
10 124.90 175.22
' 11 132.35 181.88
12 139.11 189.25
13 141.68 192.69
Circle Center At X = 61.2 ; Y = 253.9 and Radius, 101.3
*** 1.518 ***
Failure Surface Specified By 14 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 31.37 153.00
II
2 41.30 151.81
3 51.29 151.36
4' 61.28 151.67
5 71.23 152.72
' 6 81.06 154.52 '
7 90.74 157.05
8 100.20 160.29
9 109.39 164.24
' 10 118.26 166.86
11 126.75 174.13
12 134 .83 180.03
13 142.44 186.51
114 146.47 190.50
Circle Center At X = 52.2 ; Y = 284.3 and Radius, 133.0
*** 1.520 ***
Failure Surface Specified By 14 Coordinate Points
' Point X-Surf Y-Surf
No. (ft) (ft)
1 28.42 153.00
2 38.40 152.39
3 48.40 152.42
II 4 58.38 153.08
5 68.30 154.38
6 - 78.11 156.30
7 87.78 158.85
' 8 97.27 162.00
9 106.54 165.75
10 115.55 170.09
11 124.27 174.98
' 12 132.66 180.43
13 140,69 186.39
14 145.86 190.78
Circle Center At X = 43.0 ; Y = 309.0 and Radius, 156.7
*** 1.522 ***
Failure Surface Specified By 14 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 24.00 153.00
II2 33.83 151.17
' 3 43 .78 150.19 C:\stedwin\projec-1\43601ss1.OUT Page 5
4 53.78 150.07
5 63 .75 150.81
6 73.63 152.41
7 83.32 154.86
8 92.77 158.13
' 9 101.90 162.21
10 110.65 167.06
11 118.94 172.64
12 126.73 178.92
13 133 .94 185.85
14 140.45 193.28
Circle Center At X = 50.2 ; Y = 265.9 and Radius, 115.9
*** 1.524 ***
1
1
1
t
1
C244
SURFICIAL SLOPE STABILITY ANALYSIS
•
❑ Cut Slope
' 54 Fill Slope
o Natural Slope
sIzp
\ces
FSO
1 a
Parameters
Z = Depth of Saturation (feet) = 4
yb = Buoyant Unit Weight of Soil (pct) 130. 0
y, = Total Unit Weight of Soil (pct)
a = Slope Angle = 3(,-•c
= Angle of Internal Friction = 32
tc = Cohesion (psf) = 340
Force Tending To Cause Movement
Fa = Zy,cosasina= '/Zy,sin2a
Force Tending to Resist Movement
•
FR = Zybcos2atan$ + c
' Factor of Safety
z 4 ((4 -E6�32 +240 31S
FS = Zybcos atan<h + c =
0,5 (4 (13o.0)siv% s5) sob bk
'/z (Zy,sin2a)
' r PETRA GEOTECHNICAL, INC.
�tzACT Z9-734-
43&-61
1