HomeMy WebLinkAboutCT 73-18; Rancho Del Ponderosa Unit 1 Lots 17-25; Soils Report; 1975-12-08WOODWARD-CLYDE CONSULTANTS CONSIJLTING ENGINEERS. GEOLOGlSTS AND EN"lRclNMENTAL SClENTlSTS
WESTERN REGION
3467 Kurtl street San Diego December 8, 1975
Callfornla 92110 Project No. 72-253
Phone (714) 7242911
Ponderosa Homes
2082 Business Center Drive, Suite 100
Irvine, California 92664
Attention: Mr. Terry Teeple
FINAL REPORT OF ENGINEERING
OBSERVATION AND COMPACTION TESTING
RANCH0 DEL PONDEROSA UNIT NO. 1
(CARLSBAD TRACT 73-18)
LOTS 17 THROUGH
CARLSBAD, CALIFORNIA
In accordance with your request and our agreement dated October 24, 1975,
we are providing soil engineering services in conjunction with the
grading of the subject site. These services included:
(1) Engineering observation of the grading operation.
(2) Observation of the removal of loose surface and alluvial soil where
encountered prior to placing fill.
(3) Observation of the removal of potentially expansive soil from the
top 2 feet of rough lot grade where encountered.
(4) Taking field density tests in the fill placed and compacted.
(5) Performing laboratory tests on representative samples of the
material used for fill.
Site preparation, compaction, and testing were done between November 12
and December 4, 1975 in general accordance with the "Specifications for
Controlled Fill" in the Woodward-Gizienski & Associates report entitled
"Soil Investigation for the Proposed Ranch0 De1 Ponderosa Development
(Weigand Property), San Diego County, California", dated September 13, 1973.
s1010.21.58
Ponderosa Homes
Project No. 72-253
December 8, 1975
Page 2
General Site Grading
Fill was placed, compacted, and tested on Lots 17 through 25. The
grading operation essentially consisted of removing loose surface soil
where encountered, preparing the ground surface prior to placing fill
and making design cuts and fills.
As the site grading progressed, the compaction procedures were observed,
and field density tests were made to determine the relative compaction
of the fill in place. Field observations and field density test results
indicate that the fill has been compacted to 90% or more of maximum
laboratory density. The approximate locations of field density tests
and the limits of compacted fill have been recorded on a copy of the
grading glan for reference. The results of field density tests and of
relative compaction, expressed as a percent of maximum laboratory
density, are given on the attached forms.
Laboratory tests to determine moisture-density relationships, maximum
dry density, optimum moisture content, grain size distribution, plasticity
characteristics, and strength characteristics were performed on representative
samples of the material used for fill. The results of laboratory tests
are given on the attached forms.
Finish Grade Soil Conditions .__--____
All the lots covered by this report are cut-fill or fill lots. Laboratory
tests and visual inspection indicate that nonexpansive fill was placed
within 2 feet of rough grade on all fill lots and on the fill portions
of cut-fill lots noted herein.
In the case of the cut portion of cut-fill Lots 20 through 25, potentially
expansive soil was excavated and replaced with nonexpansive fill to a
depth of 2 feet below roughs lot grade and within the limits of the
entire level lot.
Rough lot grade is defined as that grade set in the field by the grade
checker from reference stakes established by the surveyor and represents
rough grade at the time we were inspecting the removal and replacement
of expansive soils. Likewise the depths of undercutting of expansive
soil and/or depths of placement of nonexpansive soil were in accordance
with Imeasurements made by and grades set by the contractor's grade
checker.
WOODWARD-CLYDE CONSULTRNTS rll*.11*11*.. L*lll”E.“.. Ih.<III>” I.,. .“O .*“I”II*“.“lll ,E,.N,l.,.
Ponderosa Homes
Project No. 72-253
December 8, 1975
Page 3
Foundation Recommendations - All Lots
(1) Foundations for single or two-story residential structures placed
on nonexpansive undisturbed soil or nonexpansive properly compacted i
fill may be designed for a bearing pressure of 2,000 psf (dead plus
live loads) at a depth of 12 inches below lowest adjacent rough or
compacted grade. Footings should have a minimum width of 12 inches.
These pressures may be increased by one-third for loads that include
wind or seismic forces.
(2) Structures that will not tolerate differential settlements (such as
foundations, swimming pools, concrete decks, walls, etc.) should
not be located within 5 feet of the top of a slope. Footings
located closer than 5 feet from the top of a slope should be extended
in depth until the outer bottom edge of the footing is 5 feet
horizontally from the outside face of the slope.
The elevations of compaction tests shown as finished grade (FG) tests
correspond to the elevations shown on the grading plans for "Carlsbad
Tract 73-18, (Ranch0 De1 Ponderosa Unit 140. l)", dated August 15, 1974,
prepared by Rick Engineering Company, San Diego, California. Elevations
and locations shown in this report are based on field surveys established
by others.
This report covers the fill placed under our observation during the
dates specified herein. Additional fill placed after these dates, as
well as the backfill in utility trenches located within 5 feet of a
building and greater than 12 inches deep, or any trench 5 feet or more
from a building and in excess of 5 feet in depth, should be compacted
under the observation of this office and tested to assure compliance
with the earthwork specifications for the project. This office should
be contacted at least 24 hours prior to backfilling operations. Utility
service trenches within 5 feet of a building that are perpendicular to
the building footings and are less than 12 inches wide and less than 3
feet deep are not subject to this recommendation.
The inspections of foundation preparation, types of materials and soil
placement and compaction as well as tests of compaction made during the
period of our services on the subject site were in accordance with the
local acceptable standards for this period. The conclusions or opinions
drawn from the tests and site inspections apply only to our work with
respect to grading and represent conditions at the date of our final
inspection.
WOODWARD-CLYDE CONSULTANTS <.<1*.1*1 Ia*” **<,,*..I,, O.,llll<l I.,. .*m .*11111*1.*11, .<:,1*1 I,,.
Ponderosa Homes
Project No. 72-253
December 8, 1975
Page 4
We will accept no responsibility for any subsequent changes made to the
site by others or by uncontrolled action of water or by failure of
others to properly repair damages caused by uncontrolled action of
water.
WOODWARD-CLYDE CONSULTANTS
,,’ ,;i’
&/g&c-&(
,~James L. Henry,
(,.-
LJL/JLH/EtiP/RPW/jr
Attachments
(1) Ponderosa IHomes
(4) Ponderosa Homes, San Diego
Attention: Karl Kreutzer
(1) Rick Engineering Company
WOODWARD-CLYDE CONSULTANTS CII”.YI,I”Y .“<I#“. . . . . O.“L‘mI.l. L”D .““I”I>*“I*I*L .c1.*11.1.
’ COMPACTION TEST RESULTS
JOB NAME RANCH0 DEL PONDEROSA UNIT NO. 1 DATE ~wor=xm ‘2-8-75
JOB NUMPER 72-253
DATES COYEREO November 12, 1975 Through December 4, 1975 PAGE 1 or 3
.llLD LA.O”AW”” “IUIIY. DIH.,,” D~“.l?-i ~0”,.cr10” -z-- KI x 0. LA.. DE”‘. --
16.9 101.7
17.6 99.5
16.9 99.6
19.0 101.9
17.6 101.8
15.6 103.3
16.9 100.3
15.6 103.9
18.3 102.3
16.9 104.0
17.6 103.8
16.3 105.2
19.0 103.1
15.6 104.9
16.9 105.2
15.G 99.0
103.5
104.9
104.3
104.3
100.3
103.9
106.0
RSl REIISl LOEATlOH rLEY*,ION NUMOFR 0, OF ,LIlT --- -
1 6.9 6.9
7.6
9.0
6.9
17.6
16.3
120' 15.6
120' 16.3
120' 15.6
120' 13.6
13.0
16.9
15.6
16.3
16.3
100.5
105.0
106.6
115.0
112.0
101.2
101.9
102.8
103.8
18.3 103.0
18.3 104.6
15.6 105.3
19.0 103.6
15.6 104.1
16.3 105.2
109.5
109.5
109.5
109.5
109.5
109.5
109.5
113.5
113.5
113.5
113.5
113.5
113.5
113.5
113.5
109.5
113.5
113.5
113.5
113.5
109.5
113.5
113.5
113.5
113.5
113.5
122.0
92.7
90.8
90.9
93.0
92.9
94.3
91.6
91.5
90.1
91.6
91.3
92.7
90.9
92.4
92.7
90.4
91.2
92.4
91.9
91.9
91.6
91.5
93.3
88.5
92.5
93.8
94.3
91.9
90.8
91.5
92.2
91.4
90.7
92.1
92.7
91.3
91.6
92.7
iiov 12
:iov 13
10
(JOV 14
ilOV 17
:IOV 18
AOV 19
LOT 27 98’
29 98’
28 100'
30 100'
LOT 27
El
102'
102'
104'
8 104'
9 2 107'
10 31 107'
11 LOT 28 10'
;L
12'
12'
12' 16
;;
LOT 33
32
I
115'
115l
115'
117'
117'
117'
118' 23
24
25
LOT 43
32
30~
28 2276
28 24 43 120'
105'
108'
110'
113'
1 22.0
1 11.5
:
11.5
11.5
1 13.5
3.5
3.5
3.5
3.5
3.5
3.5
29 26
30 27
31 26
32 27
33
34
LOT 26 115'
27 118'
26 120' 35
36
37
38
27
:B
123'
123'
123'
: COMPACTION TEST RESULTS
Joe NAME RANCH0 DEL PONDEROSA UNIT NO. 1 DATE REPORTED 12-8-,5
JOB NUMBER 72-253
DATES COYERED November 12, 1975 Through December 4, 1975 PAGE 2 or 3
DATE 3m.T IlnK,T L~CATIO” ELLYlTlDW yy.“.“f .,mLo LA.O”Aro”” “lU,lYl DIN*IT” Dml4.m co*cAcvIoY NU”BEIl 0, O.TIST !A 0”” WT. PC, ?c. Y 0. LA.. DIY.. -.- .---_
NOV 20 39 ~__
i?
42
ii
45
NOV 21 46
47
ii
50
51
NOV 22 52
53
54
55
56
z: 59 20
60 18
idOV.24 61 LOT 19
62 17
63 18
64 17
65 18
66 8
67
El
IiOV 25 70
71
72
73
74
75
76
LOT 33
44
8
34
32
30
28
LOR 8
LOT 20
::
18 2
19
30
32
34
LOT 45
44 . 42
43
::
44
123' 17.6 101.8
123' 16.3 103.3
123' 9.9 112.0
126' 13.0 113.9
126' 11.1 112.0
126' 9.3 112.9
126' 10.5 111.6
126' 18.3 103.8
123' 19.0 102.1
128' 16.3 104.7
128' 15.6 102.5
128' 16.9 103.3
128' 19.0 101.8
120' 9.9 110.3
123' 12.3 107.7
125' 11.7 111.0
127' 12.3 103.5
127' 12.3 109.0
130' 14.3 106.0
130' 13.0 105.7
133' 14.3 104.2
133' 14.3 104.7
FG 135.8' 14.9 104.5
135' 14.3 106.4
137' 12.3 106.6
FG 138.8' 15.6 106.6
FG 133.4' 14.9 106.0
129' 19.0 102.5
130' 17.6 104.0
130' 15.6 103.5
130' 15.6 103.2
128' 14.9 104.5
130' 16.9 105.0
130' 18.3 103.8
133' 17.6 104.1
133' 18.3 104.9
135' 14.9 105.0
135' 17.6 107.0
111.5
111.5
22.0
22.0
22.0
22.0
22.0
11.5
11.5
11.5
11.5
11.5
11.5
115.0
115.0
115.0
115.0
115.0
115.0
115.0
115.0
115.0
15.0
15.0
15.0
15.0
15.0
11.5
11.5
111.5
111.5
111.5
111.5
111.5
111.5
111.5
111.5
111.5
91.2
92.6
91.8
93.2
91.7
92.6
91.4
93.0
91.5
93.8
91.9
92.6
91.3
95.8
93.5
96.5
94.3
94.7
92.1
91.8
90.6
91.0
91.0
92.6
92.7
92.7
92.2
92.0
93.3
92.7
92.5
93.6
94.1
93.0
93.4
94.0
94.1
95.9
COMPACTION TEST RESULTS
JOB iNAME RANCH0 DEL PONDEROSA UNIT NO. 1 DATEREPORTED 12-8-75
Joe NUMBER 72-253
DATESCOVERED November 12, 1975 Through December 4, 1975 PAGE 3 0, 3
o*r= TC‘V 11111*1 LOCAIIOIl YOIM”E .llLD l.A.OIAro”” “.U,I”l HUMBER 0, l!LLY*TIO* 50*11N? DmNml” D~“‘,Tv COICACTIOY or TIST -.- .--__ + D”” WT. -“_ CSI # 0. LA.. Lm**.
DEC 3 77 LOT 20 FG 135.0' 13.0 106.9 115.0 92.9
:i ;: FG FG 132.6' 131.6' 13.0 14.3 1oa.5 104.6 115.0 115.0 94.2 90.9
80 23 FG 128.9' 12.3 106.0 115.0 92.1
El 125' 11.7 108.7 115.0 94.4
82 FG 127.0' 11.7 110.6 115.0 96.2
iDEC 4 LOT 28 :7
24
FG 128.2' 13.0 107.0 115.0 93.0
FG 131.2 13.0 107.1 115.0 93.1
132' 14.9 105.9 115.0 92.1
FG 128.2' 13.6 105.8 115.0 92.1
87 25 FG 127.0' 11.7 107.3 115.0 93.5
PLASTICITY CHARACTERISTICS 1 2 3 ICOBBLESI TA/y1 c, zp f 1 SILT h CLAY [
Liquid Limit, % 54 44 no
Plasticity Index, % 35 24 1001 I I I r--*--A. I I 1
Classification bv Unified Soil -,. -. I,1 I”
1 Classification l2-l CL P-l 80
60
40
E
ZERO AIR VOIDSCURVES P 20
0 1000 100 10
GRAIN SIZE, mm
MECHANICAL ANALYSIS
DIRECT SHEAR TEST DATA 12 3
Dry Density, pcf 89.6 102.2~ 90.2-
Initial Water Content, % 16.0 17.9 15.3
Final Water Content. % 2.U 24.3 27.6
Apparent Cohesion, psf 7nn 5Rf-l i ?~80
Apparent Friction Angle. degrees 80 7”” 17”
SWELL TEST DATA
lnitiel Dry Density. pcf I 1
Final Dry Density, pcf
Final Water Content. % t-l
Load. psf -
Swell, percent I I I
SAMPLE LOCATION
1 I0T # 9
2 LOT # 25
3 IOT # 77
40 LABORATORY C MPACTION
LABORATORY COMPACTION TEST TESTMETHO!,: f STM-D 1557-70 -A
FILL SUITABILITY TESTS
RANCHO DEL PONDEROSA #l
DRAWN BY: /\s CHECKED BY@ PROJECTNO: 72-253 DATE: 12-[{-75 FIGVRE NO:
W”““Wl¶R”.PI ““F r”NclllT1Iurc
151
14(
13c
1x
11c
100
90
80
PLASTICITY CHARACTERISTICS 4 5 I I COBBLESl TA/F 1 c, sp1”y f 1 SILT b CLAY
Liquid Limit, % 31
Plasticity Index, % 9
Classification by Unified Soil
Classification SYstem SC NP
VOIDSCURVES
100
g 80
g E 60
: 40
2
e 20
II II I
1000 100 10 1.0 0.1 0.01 0.001
GRAIN SIZE, mm
MECHANICAL ANALYSIS
DIRECT SHEAR TEST DATA 4 5
Dry Density, pcf 109.6 102.7
Initial Water Content, % 12.9 14.9
Final Water Content, % 3210 7.1 19.0
Apparent Cohesion. psf 280
Apparent Friction Angle, degrees 32" 30"
SWELL TEST DATA I 1
Initial Dry Density, pcf
Initial Water Content. %
Final Dry Density, pcf
Final Water Content, %
aad. psf
. . . -II
Maximum Dry
Density. pcf
: L”N I tNT, %
I” 20 30 40
LABORATORY COMPACTION TEST
FILL SUITABILITY TESTS
RANCH0 DEL PONDEROSA # 1 I
DHPiWN BY: i\s CHECKED BY: PROJECT NO: 72-253 DATE: ,2-&75 1 FlG”RENO:
WOOUWARD-CLYDE CONSULTANTS
PLASTICITY CHARAC’rERlSTlCS 11 12 13 CODBLES S!!W s>WL c f c II, , ,
Lilluid Linlit, ‘76 34 -
PI:Isticity I,xhx, X Jll’~L .L L Classification by Unified Soil
Classification System (31) SC-m (SM)
ZERD AIR VOIDS CURVES
1000 100 10 1.0 0.1 0.01
GRAIN SIZE. mm
MECHANICAL ANALYSIS
DIRECT SHEAR TEST DATA ,I ,2 I
Dry Density, pcf 111 107 ID4 1
'- Initial Water Content. % 13 16
Final Water Content, % 17 20 __ ..-- ~-.
ApparenLCaherion, psf 180 560
Apparent Friction Aoglc. dugreci 3y” 27-F --,
SWELL TEST DATA
Initial Dry Density, pcf
Initial Water Content, %
Final Dry Density, pcf
Final Water Content, %
Load, psf -.---
Swell. percent
11 12
-_ DA-..-
-- 17
__ .-La- - __ 21
-- 160 1:
-_ 0.7
kximum Dry 11 12 1
Dcnrity. pcf 118.5 115.5 116.0~-1.&M
Optimum Moisture Content. % 12.0 15.0 13.0
MOISTURE CONTENT, %
10 20 30 40
wlqk\ [ 13 1 Fill lot l@-217
LABORATORY COMPACTION TEST
FILL SUITABILITY TESTS
RANCH0 DEL POKDEROSA
DRAWNBY: BH 1 CHECKEDBY ECTNCI: 72-253F DATE: 6-14-761 FGVRE NO: 2.
WOODWARD-CLYDE CONSULT;