HomeMy WebLinkAboutCT 72-21; TANGLEWOOD; COMPACTION TEST RESULTS; 1974-02-28. -, •. q 't \'~,
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Vo.;j ~ --,\)-77 t,l' '4Ftt£, ·dttY f-< / \
Lockwood-Singh 8< ASS~ -" -~,~,>,
A CORPORATION ~ ..
Con sui tin 9 F 0 u n d 8 t Ion En 9 I n e e'r s 8 n d G e <> log 1st.
9977 Jeffer,son Boulevard' Culve'r City, Caiifornia' 90.230
Telephone; (2 13,) 870 -733,5
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R BRuce LOCKWOOD, REG
Proj. Ref. 234-42
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AWTAR SINGH C E
-') 51010 I
.2. 16 I
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February 28, 1974
Larnin Company
910'0 Wilshire Boulevard
Beverly Hills, California 90212
SUBJECT: CO:.1PACTION TEST RESULTS
ABOVE ELEVATION 100, TENrATIVELY
NAMED TP.NGLEWOOD TRACT 7 Z ... 21 CARLSBAD, CALIFORNIA '
Gentlemen:
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This report presents the results of field density and 1aboTa-'
tory testi~ of fill soils above elevation 100 at the subject
,site. Te7.'ting was confined to tW9 relatively fla-t previously
graded aT-eas within Tanglewood Tract 72:-21 which at this
time is!devoid of stnlctures. For the' pm"poses :of this' I _. ' " repoY't;.' these areas are hereIn des~gnated-as Parcel, I: &" Parcel
II. ,Parcel I is ~~eQ....Qn."..!h~gr~1'i<.llr.,2n..Ro_~.~mLi~_
sepa1!aJ§Q __ tf:9!!l ~w~l~IDg$_. 9n "th~~_,~,a,s.:LQl.._!2ved a~cess toad .•
paly"ctl II IS boundecr on the west by Er'CamlnC>ReaI HigT-iWay
and:,on the east by a natural west facIng slope. ' . .
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Testing of the fill was accompolished on Februal)r 27, 1914 u~~ng a c~terp~ll~r tractor-Ioa~er which. excav~ted a ~otal of
1§ test pItS Wl thIn parcels I & II. A. vIsual' lnspectlop was m~de of each test pit foI10\,"ooby taking field density te'sts
d,f' the fill soils. No oversize boulgers, or cemented deleterious
materials were observed in the test pits. Field density tests
were taken at frequent intervals above elevation 100 to
ascertain the compaction characteristics of the fill soils'.
All in situ density testing 'was accompolished lnaccorciance .
with ASTM D-1556-64. Laboratory determination of the maximum
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Proj. Ref. 234-42
Larwin -2-February 28, 1974
density of the fill soils was accompolished in ac\:ordance
with ASTM D l557-66T. The data for field density tests
and laboratory testing is presented in the attached' Tables I
.& II. Approximate location of test pits and compaction tes·ts
are indicated on Plate A. Generally, the compaction ··charac-
·tetistics of the fill soils were satisfactory i. e:. percent·
compaction was 90% or greater, exc.ept for localized porlions
which may have to be recompacted when actual building areas
have been established. Surface tests within top 6 inches were·
in general substandard which is probably due to the clayey
fraction within the upper'l foot of the soil wherein an increase
in volume may have occurred when in contact with wi:l:~er.
These areas may have to be re-compacted prior to construction .. . '
Minor surficial erosion of Parcel II was noted which has been
caused by runoff from the adjacent natural slope onto' the
pad area. No signi~icant erosion was noted within Parcel 1.
Allowable bearing values may be assumed at 2000 psf for'
foundations placed a minimum of 18 inches into either
compacted fill soils or naturargtound. Att~npt$ shOUld be
made not to place foundations astride natural ground/fill
interface. , ~ -
Surface fill soils· at the site generally exhibited 1m.,r
swelling potential, however, due to the expansiv~ charac~
teristics of topsoil which 'was mixed with the fill soilS·
during grading, local expansive conditions may underlie
proposed floor slabs. Al though expansive soils are not anti-:-
cipated to be very prevalent, inspections should be made
prior to construction.
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Soil ~ -The soils encountered in the fill above elevation .
100 in both the parcels were predominently sandy; clayey silts.
Plate B shows the moisture density curve of the fill soil. The.
plate also shows, in dotted lines, approximate lTloisture density
~urves of some of the other fill soils below elevation .
-100. The latter data is based on work of others; dated
June 5, 1973. We recognize approximate 6-7 different:sbii '
types in the fill.
Respectfully submitted,
LOCKWOOD-SINGH & ASSOCIATES
~(~ ~.;.f
Awtar Singh
CE 17727
AS:ml
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I Test,
No. Date ....---
I 1. 2/27/74
2 " 3 " I' 4 n
5 " 6 'II
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7 " 8 " 9 ,t
10 II
11 " 12 " 13 " IJ 14 Ii
15 " :lQ Ii
I 17 " IS " 19 "
I 2'0 II;
21 , "
22 il
I 23 II
24 II
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Proj. Ref. 234-42
Larwin
TABLE I
-3-February 28, '1914
SUMMARY OF FIELD DENSITY DETERMINATIONS . "
In Situ In Situ ReI. Test Test Soil Dry, Moisture Compac-' Location Elev. ~ Density (% dry wt.) tion NOTE
See Plate A lOS A 109' 14.S 90 " 105 " 112 11.4 92 " 104 II, 111 15.8 91 " 102 II 109 18.3 90
" 102 " 11S 12.8 97
" 110 " 111 i2.7 91
" '108 " 122 15.2 100 " 101 1.1 109 15.3 90
" 106 " 114 14.7 94 " 103 ' " 100 22.'5 82* Surface Test " 100 " 109' 14.5 90 " 103 'II 114, 15.3 94
" 106 " 105 15.0 86* ' Surface Test " 102 " 99 17 .5 82* Su:cface Test " 102 " 99 14 .. 9 82* Surface Test " 114 " 104 12.0 86* Surface Test _ ..... -.... ~-.
" 101 II ' , 114 '10.8 ' '~, --'9'4""'-'·'''''-''''''' '
" 103 " 109· 9.5 90 " 101 " 109 13.5 90 " 105 " 97 16.6 'S:O * Surface Test " 101 " 114 13.8 94 " 107 " 117 8.4 96 " 102 " 109 14.2 .90
" 110 " 123 6.2 101
I * Denotes substandard compaction.
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Soil.
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A
Proj. REf. 234-42
Larwin -4-FebrUary 28, 1974
TABLE· 'I I
Sffi\-1MARY OF LABORATORY'DENSI1Y DETERMiNATIONS
Description
Buff, very fine-
grained sandy silt ,
(slightly clayey).
Max " D· * 1.lTUl11l ry .
Density (pcf) .
121.5
Optimum
Moisture· Content
. (% .. dry. wto.) .
10.0
*Compaction standard AS1M D-1557 (5 layers) .
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150 t'
140
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120'
I 80
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I 70
I 60
o 10
. H8ISTlJRE-DENS.lTY CURVE
20 30
JOB NAME.----!LA::,..:. ~RW:.:..:I:..:..N:."..-C~:J\R=L=SJ::::..3AD;:.::.·.-..--------"'~.O.".----,..-,''
JOB NO. ---,,-'0---=2:.::::3.-:.,4 -.....:~-=2--"-'---~---.,... __ ---'-______
DATE February .28, .1974
SOIL LOC1\TION~-:--__ --,_--,---,--__
SOl L 1Y.PE __ ----.;_---. .......... _....:...,...-'--'-----,~"---,J
'test No. I !, i .••. __ ..... -. ., '1 I ,---~~~._~et._:~~.~~_ .~.{--~~ .J_._I
Wt. mold ....... ". ---L ,: ! ' I ~1~~;t _~O_i~_-~: ~-~+ -= r"---: .~---i .
--"-." . . . .---.-~. --f~: -to, -1-_0-"---,-: -' -'--
We~_.9-~~~!Y.,,_. __ .. _ ... :.._,L . ...,. _' .;:: ---"...
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Wt. wet·~$·;-il-&-t~~e '! I . :
Wt-.-dry ~~ii-&-.. t~re--···--~-· -:';-.1 ';i--~~
~--.; ___ -._0.-...... -. ____ ,_1 --~, '
Wt. tare " ---"'-----_. ---------.-I .,-.;;. .. _. ---.;....,.
Wt. 'moisture ,I .~ . -----~ -------------, -.-'-. I , Wt. dry soil i ! . _ :: --------. ...:.--.-... -----"-'---.--:---. -------
Moisture content,% 'I . .! I;
---,_ .... -.' . , ..•. '-,. '. I".
Dry density :1 ; . .,
. -,-_ ...
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Max .. Dry Density
Opt. Moisture
.. lb/it3
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% of dry wt. -------
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40 50 60 70
Moisture as % of Dry Weight
PLATE .. B