HomeMy WebLinkAboutCDP 02-42; 2200 HIGHLAND DR; RESPONSE TO CITY REVIEW OF GEOTECHNICAL INVESTIGATION; 1991-03-04March 4, 1991
KarenBlumenshine
P.O. Box 850
Carpenteria, California 93013
SUBJECT: RESPONSE TO CITY REVIEW
Minor Subdivision No. 818
Carlsbad, California
Reference: City of Carlsbad, January 30, 1991, Review of Grading plans
Ron Gutier, Erik J. Nelson, February 17, 1989, "Geotechnical Investigation, Proposed
Lot Split, Three-Acre Site, 2202 Highland Drive, Carlsbad, California"
Dear Karen:
I have received the city engineers comments regarding my review of the grading plans. My review
of the plans indicates that the plans shown are in conformance with the intent of the recommendations
of the referenced report. Some minor differences do exist as outlined in the city's response.
I. The slopes shown are steeper than was recommended in the original report. The
recommendations presented in that report were purposefully conservative to allow for some
flexibility in the design process. In addition the full height of the slope is achieved by using
two smaller 2:1 slopes which result in an overall top to bottom slope ratio of 2.3:1. I have
performed additional calculations on the slope as shown and have obtained a factor of safety
of 1.5. Copies of the calculations are included attached to this report.
2. The city does not feel that the map shows the removal of all unsuitable fill soils. It is my
opinion that reconstruction of the storm drain will result in the replacement of all
uncompacted fills in the main canyon area. No new fill should be placed over previously
uncompacted fill, and all new fills placed against slopes need to be benched into competent
soil or bedrock. This recommendation includes any fill soils located below or over the new
stormdrain pipe. Uncompacted fill soils may still remain in other areas of the site but are not
expected to have an effect on the planned structures.
There is a possibility that a minor amount of unsuitable fill will be encountered in the eastern
building area once it has been cut to the proposed grade. Since the majority of this area is
expected to be in bedrock cut, any fill soils left should be minor amounts which can be easi•y
removed and replaced during grading operations.
3. The proposed grading plan shows a 1 percent typical drainage for the site instead of the 2
percent recommended in the report. Due to the relatively high permeability and non
expansive nature of the. on-site soils, a one percent slope should be sufficient.
i
i I '. '
' ; ..
' f, . I
! I
1:/·::
Karen Blumenshine
Subdivision No. 818
March 4, 1991
Page 2
This opportunity to be of service has been appreciated. Should any questions arise or if further
services are necessary please feel free to contact me at your convenience.·
Respectfully yours,
Erik J. Nelson, P.E. C 44102
Registration Expires: 6-30-93
Civil Engineer
Run Date:
** PCSTABL5 **
by
Purdue University
--Slope Stability Analysis--
Simplified Janbu, Simplified Bishop
or Spencer's Method of Slices
12-27-90
Time of Run: 6: 17
Run By:
Input Data Filename:
01.1tput Filename:
EJN
SECTZ-Z'
SECTZ-Z'.OUT
PROBLEM DESCRIPTION SECTION Z-Z', KAREN BLUMENSHINE, LOT SPL
IT
BOUNDARY COORDINATES
6 Top Boundaries
10 Total Boundaries
Boundary X-Left Y-Left X-Right Y-Right Soil Type
N,::i. (ft) (ft) (ft) (ft) Belc,w Bnd
1 .01 7 4. 12)12) 32. 00 80.00 3
2 32.00 80.00 '34. 00 110. 00 1
3 94.00 110. 012) 106.00 110. 00 1
4 106.00 110.00 1 '35. 00 150. 00 1
5 195. 012) 150.00 254.00 150.00 1
6 254.00 150.00 350.00 150.00 2
7 32.00 80. 00 102. 12)0 90.00 3
8 102.00 90.00 250.00 134.00 3
9 250. 00 134. 00 254.00 150.00 2
10 250.00 134.00 350.00 134.00 3
ISOTROPIC SOIL PARAMETERS
3 TypeCs> of Soil
Soil Total Saturated C,::ihesion FYiction Pore Pressure Piez.
Type Unit Wt. Unit Wt. Intercept Angle Pressure Constant Surface
No. (pcf) (pcf) (psf) (deg) Param. (psf) No.
1 120.0 125.0 50.0 28.0 .00 .0 1
2 120.0 125. 0 140. 0 2'3.0 . 12)12) .0 1
3 120.0 125.0 .0 34.0 .00 .0 1
' !.. !' -: ' • I .•
l:f;~
I [·
I
'
I
, .. · •:,
100 Trial Surfaces Have Been Generated.
10 Surfaces Initiate From Each Of 10 Points Equally Spaced
Along The Ground Surface Between X = 10.00 ft.
and X = 60.00 ft.
Each Surface Terminates Between
and
X = 200.00 ft.
X = 250.00 ft.
Unless Further Limitations Were Imposed, The Minimum Elevation
At Which A Surface Extends Is Y = .00 ft.
17.50 ft. Line Segments Define Each Trial Failure Surface.
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 Janbu Method**
Failure Surface Specified By 12 Coordinate Points
Point
Ni:,.
l
•':I ..:..
3
4
5
6
7
8
9
10
11
12
X-Surf
(ft)
43.33
60.65
77.83
94.81
111.57
128.05
144.22
160.03
175.45
1 '30. 44
204. '36
207.95
Y-Surf
(ft)
85.48
87. '38
91.34
'35. 55
100.61
106. 4'3
113.19
120.68
128.96
137. 9,3
147.76
150.00
*** 1.463 ***
~L-<Y ~, /.!?
c'A(%1K "''~ >)l'-,~s #~,~.
Failure Surface Specified By 12 Coordinate Points
t
P,:iint X-Surf Y-S1.1r f
N,::i. (ft) (ft)
1 43.33 85.48
2 60.56 88.58
3 77.63 92.41
,::, .. 1 ,:::r:, ,:,c ,::,c:
j.
L· ..
>.
..J J. J. J. .... ....., ,J. .:.;...:.. .. ---. 6 127.68 108.17
7 143.86 114.83
8 159.75 122.16
9 175.31 130.17
10 1'30. 52 138.82
11 205.35 148.12
12 208. 0'3 150. (2)0
*** 1. 473 ***
Failure Surface Specified By 11 Coordinate Points
Point X-Surf Y-81.lrf
Ne,. (ft) (ft)
1 60.00 '33. 55
2 77.50 93.86
3 '34. 90 '35. 68
4 112.08 9'3. 01
5 128. ':H 103.81
6 145.26 110.05
7 161.01 117.68
8 176.04 126.65
'3 1 '30. 23 136. 8'3
10 203.48 148.32
11 205.13 150.00
*** 1.476 ***
Failure 81.lrface Specified By 13 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 ":):.■:• --:---, .,;/.L.■44 80.11
2 49.58 82.35
3 66.82 85.37
4 83.90 8'3. 15
5 100.80 "93. 69
6 117. 4'3 98. '37
7 133.92 1(2)4.99
8 150.07 111. 74
9 165.90 119.1'~
10 181.38 127.35
11 196.49 136.18
1•") ..:.. 211. 19 145.68
13 217.26 150.00
*** 1.47'3 ***
Failure Surface Specified By 12 Coordinate Points
i •
I
I I• I • I .. ; .
! l::· .•
Point X-Surf Y-Surf
►
Ne:•. (ft) (ft)
1 48.89 88.17
2 66.39 88.03
3 83.85 8'3. 26
4 101.15 91.86
5 118.20 95.82
6 134.88 101. 11
7 151. 0'3 107.70
8 166.74 115.54
'3 181. 71 124.59
10 1'35. 93 134.79
11 209.31 146.(2)8
1.-, .::.. 213.27 150.00
*** 1. 4"32 "***
Failure Surface Specified By 13 Coordinate Points
Pciint X-Surf Y-Surf
Ne,. (ft) (ft)
1 43.33 85.48
2 60.62 88.19
3 77.80 '31.55
4 94.84 95.54
5 111. 72 100.16
6 128.41 105.41
7 144.90 111.28
8 161.15 117.76
'3 177. 15 124.84
10 192.88 1?·-:• t::'.•") \J..:.... ;:.J..:..
11 208.31 140.77
1.-, .::.. 2:23.42 149.60
13 224.05 150.00
*** 1. 545 ***
Failure Surface Specified By 12 Coordinate Points
Point X-Surf Y-Surf
No. (ft) (ft)
1 43.33 85.48
2 60.83 85.13
3 78.2'3 86.25
4 ·35.60 88.82
5 112. 63 '32. 85
6 129.27 98.29
7 145.38 105.11
8 160.87 113.26
'3 175.62 122.68
10 18"3. 52 133.30
11 202.49 145.(2)6
• -""•-r ........ .--... ~ l""I "''I
·. •:-: :: :-:-·-
.=~ i);::
£;.?.'.(;-
• . I
'·.:.
*** 1.548 ***
Failure Surface Specified By 11 Coordinate Points
P,::iint X-Surf Y-Surf
Ni:,. (ft) ( ft:>
1 60.00 '33. 55
2 77.36 95.76
3 94. 5•9 '38. 81
4 111.66 112!2. 7121
5 128.51 107.41
6 145.11 112.94
7 161.43 119.27
8 177.41 126.39
':J 193.04 134.27
10 208.26 142.'31
11 21 '3. 44 150.00
*** 1.557 ***
Failure Surface Specified By 13 Coordinate Points
P,::iint X-Surf Y-Surf
No. (ft) (ft)
1 37.78 82.80
2 55.25 83.74
3 72.65 85.61
4 89.93 88.40
5 107 .1214 '32. 0'3
6 123.92 96.68
7 140.54 102.16
8 156.85 108. 512)
'3 172.80 115.70
1121 188.35 123.73
11 203.46 132.57
12 218.08 142.19
13 228.68 150. 00
*** 1.571 ***
Failure Surface Specified By 14 Coordinate Points
Point X-Surf Y-Surf
N,::i. (ft) (ft)
1 15.56 76.92
2 33.04 76.23
3 50. 53 76.83
4 67. '33 78. 6'3
= --., --. --
i
L-1
..
•'·
.,,:,•
l I
c:., J."-'-• .L~ Wua
7 118.68 91.79
8 134.81 '98. 58
9 150.40 106.52
10 165.37 115.58
11 17'3. 64 125.71
12 193.14 136.85
13 205.79 148.94
14 :206.75 150.00
*** 1.628 ***
y A X I s F T
.00 43.75 87.50 131.25 175.00 218.75
X .00 +---------+------*--+---------+---------+---------+
43.75 +
A 87.50 +
.
.
X 131.25 +
I 175.00 +
s 218.75 +
262.512) +
F 306.25 +
. . . .
. . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . .
IZ)
1
. 045 .
. . 713
0.4 .
. 9
.518.
.04
... 7.18.*
.0* . • .7 1 * .054 . . • . '3 . . . . .7512
.
. . . . . . • • • • • • . • •3
....... 731
.054 . . . . . . . . . 9731.
. .
.
. . . . . . . . . . . . 54 . . . . . . . . . . . . . . . . . . . . . . .
. .
. . . .
. . . . . .9 712 . . . . 54 . . .9.631
• • 4. *
. 9 .. 71
. . . . . . . .641
.. 94
.6 . . . . . . . . . . . . .
*
!· ..
1·
::·.:;•: .....
......
1.-·
t/i
.. :: ...
R•.tn Date:
** PCSTABL5 **
by
Purdue University
--Slope Stability Analysis--
Simplified Janbu, Simplified Bishop
or Spencer~s Method of Slices
12-27-'30
Time c,f Run: 6:26
Run By:
Inpµt Data Filename:
O•.ttput Filename:
EJN
SECTZ-Z'
SECTZ-Z'.OT2
PROBLEM DESCRIPTION SECTION Z-Z', KAREN BLUMENSHINE, LOT SPL
I T., .!7/&,?~ #e-bt-,.-L.
BOUNDARY COORDINATES
6 Top Boundaries
10 Total B,::iundaries
Boundary X-Left Y-Left X-Right Y-Right Soil Type
N,:,. (ft) (ft) (ft) (ft) Below Bnd
1 .01 74.00 32. 00 80.00 3
2 32.00 80.00 94. 00 110.00 1
3 94.00 110.00 106.00 1112). 00 1
4 106.00 110. 00 1'35. 00 150.00 1
5 1'35. 00 150. 00 254.00 150.00 1
6 254.00 150.00 350.00 150.00 2
7 32.00 80. 00 102.00 90. 00 3
8 102.00 '30. 00 250.00 134.00 3
9. 250.00 134. 12)12) 254.00 150.00 2
10 250.00 134.00 350.00 134.00 3
ISOTROPIC SOIL PARAMETERS
3 Type(s) of Soil
Scail Total Saturated Cohesion Frictic,n P,::ire Pressure Piez.
Type Unit Wt. Unit Wt. Intercept Angle Pressure c,:,nstant Surface
No. (pcf) (pcf) (psf) (deg) Param. (psf) No.
1 120.0 125.0 50.0 28.0 .00 .0 1
2 120. 0 125.0 140.0 29.0 .00 .0 1
3 120.0 125.0 .0 34.0 .00 .0 1
i;f}
•' .. L : •
,··
!· .··•
' i· !
I j.
'
Point X-Surf Y-Surf
No. (ft) (ft)
1 43.33 85.48
2 60.65 87.98
3 77.83 ':H. 34
4 '34. 81 95.55
5 111.57 100.61 ! •
6 128.05 106. 4'3
7 144.22 113. 1'3
8 160.03 120.68
'3 175.45 128.96
10 190.44 137. 9'3 [• ... ..
11 204. '36 147.76 r
12 207. '35 150.00 '. ,.
f
Spencer's FOS FOS r~'.tr.
Theta C:Mc•ment) <:Force) I.•:
(deg) (Eqr.ti 1. ) C:Equil.)
12.50 1. 641 1. 477
18.75 1.554 1.484
24.89 1. 250 1. 4'32
20.58 1. 506 1. 487
19.57 1. 535 1.485
21. 77 1.463 1.488
20.77 1.500 1.487
20.88 1. 4'36 1. 487
21.14 1. 487 1.487
Factor Of Safety F,:,r The Preceding Specified Sr.tr face =~
Spencer's Theta = 21. 14 ,-,:Jt.Me,L Vf" 6, /. 5
~
Factor Of Safety Is Calculated By Spencer's Methc•d C•f Slices
*** Line of Thrust ***
Slice X y Side F,::irce
N,::i. C•::iord. Cc,ord. L/H ( 1 bs)
1 60.65 90.08 .357 2100.
2 77.83 94.36 . 278 5708 .
3 94.00 '3'3. 07 . 254 9075 .
4 '34. 81 '39. 31 . 260 9264 .
5 106.00 103.10 .377 10608.
6 111.57 105.01 .370 11231.
7 128.05 111. 14 .346 11841.
8 144.22 117.71 .323 11040.
9 160.03 124.73 . 298 8928 .
10 175.45 132.22 . 266 5846 .
11 190.44 140.37 .2313 2403.
1•";• .... 1 '35. 00 143.27 .247 1286 .
13 204.96 160.23 5.566 19.
14 207. '35 160.17 .000 20. I
y A X I s F T I
.00 43.75 87.50 131.25 175. (2)(2) 218.75
X .00 +---------+------*--+---------+---------+---------+
*
43.75 + s
s
s
A 87.50 +
s * * s *
X '131.25 + s
s
s
I 175.00 +
s 218.75 +
262.50 +
F 306.25 +
T 350.00 +
**************iHE-************************* ****** STOP -Illegal Command ******
*****************************************
Legal Commands -PROFIL
LOADS
TIES
WATER
SURFAC
EXECUT
s
s
* s
s
* *
* *
::>•:i,;
._•;.,:,
wWJ.L
RANDOM
CIRCLE
CIRCL2
BLOCK
BLOCK2
LIMITS
ANISO
SURBIS
SPENCR
i I i ! '
[,, ,: I· . I • • •
'.t
','
I ;
I I I I
I I i l I I I
I ! I i
f i
/4 '/{ C /, .v /.:Z.O I .!.:<? , I
I I -f-Z& i ~~
I ~ /.:Z..C:,, I ~r-5 ,1"7"0
;L~ I I I I i/11 i I i i .e,
I I ·I 1/ 1 1°1 I f, ! I ! I . I : f I i ! :
I f :
I
I I i If; 6'
I I • ~
I I
,jf :l {,P
I I ! I di.I-,' ;}4 I -! ,./' I IY' ! I , I
I . j I •
! ! I I (1)
I I' I
,,a \10 ~ ~4'11'")'
~. ~C.• ' --------'
I ,1~ --Mt' ----~.sa.,. V.,.-' I· , i ~ I ltlO· I . : I j I I I
I I ; ·, ' I I ' I ~ ! : I p 'l-) "?'7 ' i
'I.,,
0'. .. -
! ' ,.,
0 ! I §J,fl ,,,,, IS~ "LflP ' '. 1.1, ~o s+"
' i
i I
~ I
, .. ,.,, .. -' ,.• I.··
_,./
_,,,
,,.,------'
·, I \ I \ \ \
'· \
--· .-·-·· ...-
\
~c:::::::;v-AL I'~~
c:::::;,:= ~~~E n'LL-~ ~ ~#v' ,: :,L//G".,L/L..AVO •
~A/~/0\/ ~ .:...;bC.%?l
?~ ~A'-L-e:e:=-,,q/~ T~
V'/Ze= 0/...57VR-8/Nt::5 ./v".,.4'T/V~
: )'::"'"7:2t"77c::>/,./
~ ....5,-¼:tL-L-ez:=: ~~ ~
~A/ d' --2 c::::' J!r 7V .h1'G",4/~ .0~/~
I
I ~\
' \
I
\
r· .
• \ -------------
\ \
••'
.. __ ,,
. ·-·,,,. ••
'·-.'. ) / ) . . / ,
~~ • t.--. l ....,.,,.I¼-'
~ov_-i ~~--····-~
\
\ \
\ \
. •.. " ~ ~ / G°"~6"~
~ ---~~A#v' . -. ,, .
A •, . ........... -, ' .. __ '· ........ ...... "-..... ...... __ • ....... ' ....... .. "" '-• •• ," ··,.. ',.,
-. ·1 ... ........__ ... ,..... .. ... , ··...... • ' "· ' ... , ~ ',
'"---
";,r/(.-~ ', __ -20%' -.•
' /
-.-..
\
\
?'h...-·,
·if?· .•
_,,.,,•
8.--., '
~~A<.,t
C/~72::
~Lf/"'")J.,I,. /,,-::_