HomeMy WebLinkAboutCT 05-06; CASSIA PROFESSIONAL OFFICES; AS-GRADED GEOTECHNICAL REPORT O'DAY MEDICAL OFFICE BUILDING; 2006-09-1400 - ' . .Q
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TABLEOF CONTENTS
1 SECTION PAGE
1 SITE DESCRIPTION AND PROPOSED DEVELOPMENT 1
IA'. SITE PREPARXTION
111 Primary Equipment 1 1 11 2 Initial Site Grading 2 I ll 3 Site Grading by Southern California Soil and Testing 2 1 -1.4. Cut/Fill Transition 2
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1.1.5: Keyways ...... . ................. .............. .................................. . .... ................................................. ..3 ' :,.L l.6. 6 Fill Slopes
1.1.7.. Roadways 3 1.2. FIELD OBSERVATION AND TESTING 3
I ... I .3. LABORATORY TESTS ......... ........................................................... . .............. . .......................... 4 1.4. REMAINING WORK 4
2 4 CONCLUSIONS
I 3 LIMITATIONS 4
I ATTACHMENTS -
PLATES I
I Plate 1 Limits of Removals and Fill Elevations by Geocon, Inc
Plate 2 FieldL Density Test Locations
Plates 3-4 Field Density and , Laboratory Compaction Test Results
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4 SOIL & TESTING INC San Diego Office Indio Office
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: PHON.E P0. Box 600627. •. PHONE . 87.4o citrus Avenue — 0 619' 280-4321 (760) 775-5983 . . -
0 ... San Diego, CA, 92160-0627 . Suite G v 41 6280 Riverdale Street
Indio cA 92201 3438 San Diego CA 92120 FAX
(619) 280-4717' www scst corn (760) 8362 www scat corn
1 September 14, 2006 - SCS&T No 0611114
Report No 3
I Mr. Pat
O'Day Consultants
2710 Loker Avenue West
I Carlsbad, California 92008
Subject AS GRADED GEOTECHNICAL REPORT
I O'DAY MEDICAL OFFICE BUILDING
2020 CASSIA ROAD
CARLSBAD, CALIFORNIA
I Reference 1) 'Geotechnical Investigation, Cassia Road Site, Carlsbad, California prepared by
Geocon, Inc.; dated December 16, 2004 (07431-22-,01)..
I Dear Mr O'Day
I
I
In accordance with your request, this report has beep,
,prepared to present the results of field
observations and tests performed in conjunction with the grading operations and site improvements
at the subject site Our services were performed between August 8 nd August 23, 2006 The
I grading was performe1d by Vinci Pacific Corporation of Rancho Santa Fe, California To assist., n
determining the locations and elevations of our field density tests, we were provided with a grading
plan prepared by O'Day Consultants dated July 2005, which defines the general extent of site
-
grading
I i SITE DESCRIPTION AND PROPOSED DEVELOPMENT
The project site is a.3-acre triangular-shaped parcel located east of El Camino Real and north of the
extension of Cassia Road Grading was performed to provide for two building pads, roadways,
slopes and incidental areas necessary for the development of two office buildings
I i 1 SITE PREPARATION
'0• .1.1.1. Primary Equipment
. . : •.
I 1 The primary equipment employed for the mass gradfng operation consisted of
1
- Caterpillar 950 Loader. 1 - Water hose
I 1-John Deere 700 poze?
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Pat O'Day . . . . . . . - . •.: September 14, 2006 O'Day Medical Office Building . . SCS& T Na. 0611114-3. 2020 Cassia Rd., Carlsbad, GA.
. . , . . . .. . Page 2
1.1.2. Initial Site Grading
.......... The potentially compressible topsoil deposits were removed in their entirety from ihe.propàsed
building pads The bottoms of the removal areas typically exposed Santiago Formation The I removals extended five feet laterally beyond the extent of each building These removal limits
and fill placed were observed by, Geocon, Inc The limits of removals and fill elevations are
illustrated on Plates No 1 and 2
1.1.3. Site Grading by Southern California Soil and Testing
I 'Southern California Soil and Testing began performing geotechnical observation and testing on
August 8, 2006 Six in-place density tests were performed on August 8, 2006 in the previously, ' placed fill The potholes revealed that some of the fill contained roots and other organic matter.
The fill in the building pad area's was removed to a depth of one foot and scarified to a depth of
one additional foot The detrimental material generated from these operations was exported I . frónithe site.,. . . .'. : . .. .
..
Potentially compressible topsoil deposits were removed in their entirety from the areas to receive
fill and from beneath settlement-sensitive improvements under SCS&T observation beginning
August 8, 2006 The bottoms of the removal areas typically exposed Santiago Formation
I deposits These removals extended throughout the site and at least two feet beyond the
retaining wall and pavement areas Limits of the removals are shown on Plate No 2 Additional
removals in the proposed pavement area will be performed during subsequent 'stages of I ... construction The additional removal areas are shown on Plate No 2
The soils generated from the removal operations and the on-site cuts were placed in the
removal areas as compacted fill material Some imported soils also were used Typically, fill soils
were placed in thin moiture conditioned lifts and compacted until field density tests indicated a
minimum of 90 percent of maximum dry density Compaction was achieved by means of ,,a
Caterpillar 950 rubber tire loader and other heavy construction equipment This process
I continued until design -elevations were reached
1.1.4'. Cut/Fill Transition
Where a transition between cut and fill material occurred within three feet of finish pad grade
the cut portions of the pads wereover-excavated to a minimum depth of three feet below
I finished pad grade The over-excavation was performed to create a uniform condition beneath
the proposed structures and improvements and to lessen the potential for differential
settlements Undercuts were all performed in parking areas to remove expansive soils The fill
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Pat 0 Day September 14 2006
I .
O'Day Medical Office Building . . .
. . . . . SCS& T No. 0611.1.14-3 2020 Cassia Rd.,-Carlsbad; CA •. I . . . Page.3
material was generally placed and compated as previously described until design elevations
I were reached -
I 115 Keyways
To provide adequate support for the proposed fill slopes located in the eastern portion of the
site, keyways were cut into formational materials along the toes of the slopes The keyways
I were generally 15 feet wide and sloped back into the existing sloping terrain at an approximate
gradient of two percent The keyway bottoms were scarified to a depth of 12 inches, moisture
I conditioned and compacted prior to receiving additional fill
1.1.6. /Fill Slopes
I Typically, the fill slopes were over-filled and wheel rblled by a rubber-tire dozer and other heavy
equipment, at two-foot vertical increments ..After approximate final grades were obtained, the
I slopes were cut back to designed inclinations In order to further compact the fill slopes and to
provide fora uniformly compacted slope surface, the faces of the slopes were track-walked with
a crawler dozer. . . . . . . .. .
1- 1.1.7. Roadways - -
I The project site included the rough grading for the widening of El Camino Real and the
extension of Cassia Road Site preparation for Cassia Road essentially consisted of the same
operations that were employed for the project site The original topsoil was removed until the top
I of competent material was encountered Fill material was placed in thin moisture conditioned lifts
and compacted to a least 90 percent of maximum dry density Additional removals for the
I extension of Cassia Road will be performed at a later date
- The rough grading for the widening of El Camino Real essentially consisted of removing the
I topsoil and formational deposits to the elevations of the existing El Camino Real Road
1.2..: FIELD OBSERVATION AND TESTING
I Field observations and density tests were performed at the locations shown on Plate No 2 by a
representative of SCS&T during the grading operations The density tests were performd according
to ASTM D 2922-01 (nuclear gauge) procedures The results of these tests are shown on Plate Nos
3 and '4.. The accuracy of the in-situ density test locations and elevations is a function of the
I
accuracy of the survey control provided by others Unless otherwise noted, their locations and
elevations were determined by pacing and hand level methods and should be considered accurate
only to the degree implied by the method used
I -
Pat O'Day . . . . . . September 14,2006 O'Day Medical Office Building - . . .. SCS& T No. 0611114-3
- I .• ,
.2020 Cassia Rd., Carlsbad, CA : . . . Page 4
As used herein, the term "observation" implies only that we observed the progress of work we were
I involved with, and performed field density tests, which in conjunction with ourobservations, were the
basis for our opinion as to whether the work was performed in substantial conformance with the
I geotechnical recommendations and the requirements of the applicable agencies
1.3.-. LABORATORY TESTS
I Maximum dry density determinations were performed on representative samples of the soils used in
the compacted fills according to ASTM D. 1557-00 The results of these tests, presented on Plate
1 No 4, were used in conjunction with the field density tests to determine.the'degrep of relative
compaction of the compacted fill
1 The expansi9n potential of fill soils within th upper three feet of finish grade was determined using
UBC Test Method 18-2 The results of the tests are shown on Plate No 4 rhe results of these tests
I indicate non detrimentally expansive soil conditions
1.4., REMAINING WORK
I The following operations remain to be completed It is recommended that field observations and
relative compaction tests be performed dunng these operations to verify that these operations are
I being performed in accordance with job requirements and local grading ordinances
Additional grading of the on -site paved areas and widening of Cassia Road,
I • Preparation and the placement of the roadway, parkway, and curb and gutter subgrade,
Preparation of the parking lots and Cassia Road subgrade and base courses,
I • Backfilling the underground utility trenches
2 CONCLUSIONS
I Based on our field observations and the in place density test results, it is the opinion of SCS&T that
the grading work was performed substantially in accordance with the recommendations contained in
the referenced geotechnical report, the City of Carlsbad Grading Ordinance, the
Grading/Improvement Plan Drawing Number 438-3A, and the California Building Code Minimum
I
recommendations for the design of the foundations, as presented in the referenced report, remain
applicable
3 LIMITATIONS
This report covers only the services performed between August 8 and August 23, 2006 Our
opinions presented herein are based on our observations and the relative compaction test results
/
Pat 0 Day September 14 2006 / .' O'Day Medical Office Building
.• . .
; • -SCS&T.No. 0611114-3 2020 Cassia Rd., Carlsbad, CA .. . : • . Page 5
and are limited by the scope of the service that we agreed to perform Our services were performed
in accordance with the currently accepted standard of practice and in such a manner as to provide a
reasonable measure of the compliance of the grading operations with the job requirements No
I warranty, express or implied, is given or intended with respect to the services Iwhich we have
performed, and neither the performance of those services nor the submittal of this report should be
I
construed as relieving the contractor of his responsibility to conform with the job requirements
Our services were generally performed on an "on call" basis Therefore, the in-place density tests
I performed by our field representative can only be construed as representative of the areas tested
If you have any questions or need additional information, please call Steve Ward or me at 619-280-
4321
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James, CIA ..
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SCS&T LEGEND
320.0! Approximate Elevations of Fill
Signed Off by Geocon, Inc.
- Approximate Limits of Removals
Signed Off by Geocon, Inc.
LOT 4R04=
077 ACRES
f _=,320. 9
PAL7=1202
16.5[
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316.5
, A SL
09 r 1318.5
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372
0
20' 0' 20' 40' ><
Le SCALE: 1"=20'
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20
SC.
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SOUTHERN CALIFORNIA
SOIL & TESTING, INC.
O'Day Medical Office Building
By: SWIDCD Date: 08/12/06
Job No.: 0611114-3 Plate: 1
SCS&T LEGEND
47 Approximate Location of In-Place Density Test
1316.01 Approximate Removal Bottom Elevations
- Approximate Limits of Removal
I • Approximate Limits of Keyway
Area To Be Removed At a Later Date
Approximate Limits of Removal Signed Off by
Geocon, Inc.
f OR SIC R
314
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19
20' 0' 20' 40' 80'
SCALE: I ll
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SIT
SOUTHERN CALIFORNIA
SOIL & TESTING, INC.
O'Day Medical Office Building
By: SW/DCD Date: 08112106
Job No.: 0611114-3 Plate: 2
I.
JOB NAME: O'Day Medical/Office Building JOB NUMBER: 0611114-3
IN-PLACE DENSITY TESTS
TEST ELEVATION MOISTURE DRY DENSITY SOIL REL.COMP. NO. DATE . LOCATION - (féet,MSL) (percent) (p.c.f.) TYPE (percent)
Grading . 1 8/8/06 Building 318.0 11.3 114.8 1 , 92.1
2 8/8/06 Building B 318.0 12.2 121.5 2 98.1
3 8/8/06 Building B 319.5 12.3 114.5 1 -91.8
4 8/8/06 .Building 318.0 14.2 115.0 2 92.8
5 8/8/06 Building . 315.0 12.2 113.9 2 91.9
6 8/8/06 Street between Buildings A & B 315.0 13.7 113.7 2 91.8
7 8/9/09 Building B 319.0 14.3 114.3 2 92.3
8 8/9/06 Street between Buildings A & B 316.0 12.0 113.9 2 91.9
9 8/10/06 Street between Buildings A & B 316.5 11.7 115.1 1 92.3
10 8/10/06 Street between Buildings A & B 317.5 13.5 114.6 2 92.5
11 8/10/06 Northeast Parking Lot 314.5 11.5 114.5 2 92.4
12 8/10/06 Northeast Parking Lot 315.5 12.0 117.1 . 1 93.9
13 8/10/06 Northeast Parking Lot 316.0 13.1 '113.5 2 91.6
14 8/10/06 Northeast Parking Lot 316.0 13.5 • 112.5 2 ,y90.8 15 8/11/06 Southeast Parking/Driveway 316.0 12.4 115.6 1 92.7
16 8/11/06 East Parking Lot 318.0 - 12.7 116.8 1 " 93.7
17 8/11/06 East Parking Lot 318.0 . 13.9 118.2 1 94.8
18, 8/11/06 East Parking Lot 318.0 11.5 118.4 1 94.9
19 8/11/06 East Parking Lot 315.0 12.5 112.5 2 . 90.8
.20 8/14/06 East Parking Lot 318.5 13.3 116.7 1 93.6
21 8/14/06 East Parking Lot . 319.0 13.2 113.8' 2 91.8
22 8/15/06 South Parking Lot/Street 318.0 15.1 113.4 2 91.5
23 8/15/06 South Parking Lot/Street 318.0 12.6 115.2 2. 93.0 , 24 8/15/06 South Parking Lot/Street 318.0 11.5 113.9 2 . 91.9
25 8/16/06 South side of Building B 320.0 10.7 113.9 2 . 91.9.
26 8/16/06 South side of Building B . 318.0 11.8 115.2 2 93.0
27 8/16/06 West side of Building B , 318.0 - 9.9 114.1 2 ' 92.1
28 8/16/06 North side of Building B . 314.0 12.5 112.5 2 90.8
29 8/16/06 North side of Building B . 313.0 11.5 111.8 2 90.2
30 8/16/06 North side of Building B . 316.0 12.6 111.7 . 2 90.2
31 8/16/06 North side of Building B . 316.0 13.9 112.0 2 90.4
32 8/16/06 North side of Building B . 318.0 10.0 113.8 . 2 91.8
33 8/16/06 North side of Building . 317.0 11.7 114.5 2 92.4
34 8/18/06 Building A 318.5 14.0 118.6 1 . 95.1
35 8/18/06 Building A , . . 318.5 12.4 116.0 1 93.0
36 . 8/18/06 ParkingLot - NorthsidebuildingA . 310.0 . 15.2 107.7 3 91.3
37 8/18/06 Parking Lot - West of building A 312.0, 12.6 108.5 3 1 91.9 38 8/19/06 DW between Pads A&B 320.0 . 12.4 106.7 3 .90.4
,39 8/19/06 DWbetween Pads A&B . 319.0 13.9 108.3 3 91.8
40 8/19/06 North side of Building A . 314.0 13.2 107.4 3 i 91.0
41 8/19/06 North side of Building .A 314.0 11.6 108.5 3 . 91.9 42 8/19/06 North side of Building A 315.0 12.7 106.9 3 90.6
43 8/21/06 Parking lot - North of Building A 3,10.0 13.7 109.4 . 3 . 92.7
44 8/21/06 Parkinglot - NorthofBuildingA 312.0 ' 15.1 108.1 .3 91.6 45 8/21/06 Parking lot - North of Building A 315.0 14.2 - 108.7 3 '92.1
46 8/21/06 Parking lot - North of Building A . 315.0 13.5 106.6 - 3 90.3 47 8/22/06 Parking lot - North of Building B 320.0 12.6 112.8 2 91.0
48 8/22/06 Parking lot - North of Building B 320.0 13.7 113.6 2 . 91.7 49 8/22/06 Parking lot - North of Building A 317.0 :12.5 .. 108.0 3 ' 91.5 50 8/23/06 Parking lot - North of Building A . 319.5
,
. 10.4 1090 3 92.4
PLATE NO! 3
JOB NAME: O'Day Medical/Office Building JOB NUMBER: 0611114-3
IN-PLACE DENSITY TESTS
TEST ELEVATION MOISTURE DRY DENSITY SOIL REL.COMP.
NO. DATE LOCATION (feet,MSL) (percent) (p.c.f.) TYPE (percent)
51 8/23/06 Parking lot - North of Building A 319.5 9.9 116.0 2 93.6
52 8/23/06 Building A 319.5FG 11.2 117.5 IMP1 91.7
53 8/23/06 Building B 320.0 FG 9.5 113.6 2 91.7
MAXIMUM DENSITY AND OPTIMUM MOISTURE SUMMARY (ASTM D1557)
Soil Maximum Optimum
Type Soil Description Density, pcf Moisture, %
1 Dark Brown Silty Sand 124.7 8.8
2 Tan to Light Brown Silty Sand with Clay 123.9 . 9.1
3 Yellow Silty Sand (Santiago Formation) 118.0 9.6
IMPi Import: Orange to Brown Siltry Sand 128.2 9.1
. . •.:.•.' .. . .. ...... EXPAN.SIQNIN
EXPANSION SAMPLE EXPANSION EXPANSION
TEST SAMPLE LOCATION INDEX POTENTIAL
Eli Pad 32 Low
El Pad 29 Low
PLATE NO. 4