HomeMy WebLinkAbout8758; Santa Fe Railway Leased Parcel; Parking Lot Santa Fe Railway; 1982-10-26GeoSoi Is, Inc.
Soil Mechanics • Geology • Foundation Engineering
9295 Chesapeake Dr., Suite E • San Diego, California 92123 • [714] 560-7827
October 26, 1982
W.O. 209-SD
Rick Engineering Company
3088 Pio Pico Drive
Carlsbad, California 92008
Attention: Mr. Bob Stockton
Subject: Proposed Parking Lot
Santa Fe Railway Leaded Parcel
City of Carlsbad, California
Gentlemen:
In accordance with your request, GeoSoils, Incorporated has
reviewed the grading and site plan and completed a reconnaissance
study of the subject project area. The grading plan was recently
prepared by Rick Engineering Company.
We understand that the site is planned for a redeveloped parking
lot which will support light to moderate traffic loads. The plans
indicate the rempval of approximately 300 cubic yards of soil
Los Angeles Office: (213) 785-2158 • Orange County Office: (714) 547-6703
Rick Engineering Company Page 2
October 26, 1982
W.O. 309-SD
during grading. No significant slopes are proposed.
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Our site study included a visual appraisal of surface exposures
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and the excavation and retention of representative underlying
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soils. These were subjected to "Revalue testing for pavement
design criteria. This transmittal summarizes our findings andii
presents construction recommendations consistent with the indicated
field conditions.
GeoSoils, Inc.
Rick Engineering Company Page 3
October 26, 1982
W.O. 309-SD
"•SITE: CONDITIONS
The planned parking lot will occupy a rectangular shaped parcel
which fronts on Elm Street adjacent to the existing railroad
tracks, in the City of Carlsbad. The site is relatively flat
and currently supports an enclosed parking lot in the rear
(southern).half.
Surface exposures suggest the presence of shallow fill soil deposits.
These likely developed from periodic dumping and railroad
construction. Underlying soils consist chiefly of brown silty
fine sand in a compact condition below loose surfxcial soils.
Minor trash debris was noted in the upper exposures.
GeoSoils, Inc.
VICINITY MAP
DATE _Oc£_Q2 BY D A?
Soil Mechanics • Geology • Foundation Engineenng
Rick Engineering Company Page 4
October 26, 1982
W.O. 309-SD
RECOMMENDATIONS
The following construction recommendations have resulted from
our site reconnaissance and the results of an "R"-value test
performed by Testing Engineers on a representative soil sample.
A copy of the "Revalue test result is attached herein. Pavement
recommendations given below reflect a traffic index value of 4.5
as indicated by the Engineering Department of the City of Carlsbad.
1. Existing surface structures, including paving and trash
debris should be removed from the site. '
2. Exposed surface soils should be removed, brought to
optimum moisture levels and mechanically recompacted to
90 percent of the laboratory maximum value.
Removal depths are difficult to determine at this time
as much of the surface area is currently utilized for
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parking. However, based upon available information, a
depth of one to two feet should be assumed for estimating
purposes. Th±s value may vary depending upon actual
conditions exposed during grading.
GeoSoils, Inc.
Rick Engineering Company Page 5
October 26, 1982
W.O. 309-SD
Removal and recompaction efforts should be inspected,
tested and approved by the project soils engineer.
3. Test results indicate an "Revalue of 78 for the under-
lying site soils. Based -upon this value and an assumed
traffic index of 4.5, the following pavement section is
recommended.
2 inches Asphalt Concrete
6. gnches Base/Decomposed' Granite
8 inches Total Thickness
Placement and construction of the recommended pavement section
should be performed in accordance with the Standard
Specifications For Public Works Construction. Decomposed
granite may be used as indicated and should have a minimum
"R"^value of 78 and a minimum sand equivalent of 30.
4. Finish grades should be such that surface waters are
directed off the lot area in a positive manner.
GeoSoils, Inc.
Rick Engineering Company Page 6
October 26, 1982
W.O. 309-SD
Should you have any questions, or wish to discuss this matter
in further detail, please feel welcome to contact our office.
Sincerely yours,
Dennis Middleton, CEG 980
Engineering Geologist
Roy E. Moore, RCE 28119
Principal Engineer
REM/
/DM/
/em
GeoSoils, Inc.
Testing Engineers—San Diego
3467KurtzSt, P.O. Box 80985, San Diego, Ca. 92138 (714)225-9641
1903 West Vista Way, UnitB, Vista, California 92083 (714) 758-3730
LABORATORY NUMBER SD37-2671 REPORT OF SOIL TESTS DATE 10/22/82
JOB DATA: File //5070-1 . .
PROJECT: Elm Street, Oceanside
CLIENT: GeoSoils, Inc . .
9295 Chesapeake
San Diego, CA 92123
.SAMPLE DATA: Material submitted
to the laboratory on 10/18/82.
R-VALUE DATA
COMPACTOR PRESS - P.S.I.
MOIST e> COMPACTION •%
DENSITY - #/Cu. FT.
R-VALUE - STABILOMETER
EXUD. PRESSURE - P.S.I.
STAB. THICK - FEET
EXPAN. PRESS. THICK-FEET
DESIGNR. VALUEA
350
8.2
127.9
83
690
0.24
0.17
B
350
8.6
126.8
74
200.;
0.37
0.13
c
350
9.0
126.0
72
180
0.40
0
D
T. 1. (ASSUMED) •= —
BY STAB, e> 3OO P.S.I. EXUD. « 78
BY EXPANSION PRESSURE =
AT EQUILIBRIUM * . -,n
SAND EQUIVALENT = .
BEARING VALUE (CALIFORNIA HIGHWAY METHOD)
COMPACTED AND SOAKED'FOUR DAYS
PENETRATION STANDARD % OF
INCHES P.S.I. P.S.I. STANDARD
O.I IOOO
O.2 15OO
O.3 19OO
O.4 23OO
O.5 26OO
MOISTURE AFTER SOAKING %
EXPANSION. . . <4
COMPACTION TEST:
METHOD — CALIFORNIA BEARING
OPTIMUM DRY*DENSITY LBS /cu FT
PLASTIC CHARACTERISTICS:
LIQUID LIMIT -
PLASTIC LIMIT -
PLASTICITY INDEX -
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REPORTED To: fl) GeoSoils, Inc
TESTING ENGINEERS • SAN DIEGO
REVIEWED BY - t
WJD:cd William J.^eBerrfT R.C.E. i?34545