HomeMy WebLinkAbout; Parking Lot Rancho Santa Fe Railway; Parking Lot Rancho Santa Fe Railway; 1982-10-26GeoS0ttSf Inc.
Soil Mechanics • Geology • Foundation Engmeering
9295 Chesapeake Dr.. Suite E • San Diego. Cahfornia 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 Lea^'sed Parcel
City of Carlsbad, Califomia
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 moderPte traffic loads. The plans
indicate the reir\pval of approximately 300 cubic yards of soil
Los AngeJes Office; (213} 785-2158 • Orange County Office: (714) 547-6703 , i'^^'
Rick Engineering Company Page 2
October 26, 1982
W.O. 309-SD
during grading. No significant slopes are proposed.
Our site study included a visual appraisal of surface exposures
and the excavation and retention of representative underlying
soils. These were subjected to "R"rvalue testing for pavement
design criteria. This transmittal summarizes our findings and
presents construction recommendations consistent with the indicated
field conditions.
GeoSoitSf Ine,
Rick Engineering Company Page 3
October 26, 1982
W.O. 309-SD
SITE- CONDITTONS
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 frora periodic dumping and railroad
construction. Underlying soils consist chiefly of brown silty
fine sand in a compact condition below loose surficial soils.
Minor trash debris was noted in the upper exposures.
GeoSoils, Inc.
1^1 VICINITY MAP 1^1 HATF Oct. Ql WO NQ 309 D M 1^1 Soil Mechanics • Geology • Foundation Engineering
Rick Engineering Company Page 4
October 26, 1982
W.O. 309-SD
RECOHMENDRTIONS
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 "R"-value test result is attached herein. Pavement
recoiranendations 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
parking. However, based upon available information, a
depth of one to two feet should be assumed for estimating
purposes. This value may vary dependirng upon actual
conditions exposed during grading.
GmoSoitSf Ine.
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 "R"-value 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 inches Base/Decomposed" Granite
8 inchies 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"-»rvalue 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.
GooSoilSy Ine.
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
GooSoilSy Inc.
Testing EngineersSan Diego
3467KurtzSt., P.O. Box80985, SanDiego, 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
A B c D
COMPACTOR PRESS - PS.I. 350 350 350
MOIST COMPACTION - % 8.2 8.6 9.0
DENSITY • */Cu. FT. 127.9 126.8 126.0
R-VALUE - STABILOMETER 83 74 72
ExuD. PRESSURE - P.S.I. 690 200' 180
STAB. THICK - FEET 0.24 0.37 0.40
ExPAN. PRESS, THICK-FEET 0.17 0.13 0
T. I. (ASSUMED)
BY STAB • 300 PS.I. EXUD. 78
BY EXPANSION PRESSURE -
AT EQUILIBRIUM • 78
SAND EQUIVALENT =
BEARING VALUE (CALIFORNIA HIGHWAY METHOD)
CoMPACTEp ANB^SQAK^D FOUR DAY;
PENETRATION STANDARD % OF
INCHES P.S.I. P.S.I. STANDARD
o.l tooo
0-2 1500
0.3 I900
0.4 2300
0-5 2eoo
MOISTURE AFTER SOAKING *
EXPANSION *
COMPACTION TEST;
METHOD — CALIFORNIA BEARING
OPTIMUM MOISTURE »
OPTIMUM DRY DENSITY. LBS./cu. FT.
PLASTIC CHARACTERISTICS;
LIQUID LIMIT
PLASTIC LIMIT
PLASTICITY INDEX
REPORTED TO: (1) GeoSoils, Inc.
TESTtNG ENGINEERS • SAN DIEGO
RCVIEWED BY
WJDicd