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Home My WebLink AboutCT 04-20; MATCHPLAY AT LA COSTA; AS-GRADED GEOTECHNICAL REPORT; 2006-04-03I 6ç04'l'O SOIL & 'STING INC San Diego Office Indio Office I P H 0 N E PO. Box 600627 P H ON E 83-740 Citrus Avenue '(619) 280-4321 (760) 775-5983, San Diego, CA 92160-0627 Suite G 5C TOLL FREE 7) 215 6280 TOLL FREE 87 -4321 (977) 215-4321 Indio, CA 92201-3438 San Diego, CAt92120 I (619) 280-4,717 www.scst.com (760) 775-8362 www scst corn I " I AS-GRADED GEOTECHNICAL REPORT MATCHPLAY AT LA COSTA I -. 2523 NAVARRA DRIVE CARLSBAD, CALIFORNIA I I 4 I PREPARED FOR I MR DAVID WRIGHT MICHAEL CREWS DEVELOPMENT 939: SOUTH. ANDREASEN . . ESCONDIDO, CALIFORNIA 92065 - . . I I I PREPARED BY - SOUTHERN CALIFORNIA SOIL & TESTING, INC 6280 RIVERDALE STREET . '.4 . ,.... 1 - " SAN DIEGo, CALIFORNIA 92120 Providing Professional Engineenng Services Since 1959 I I - / - : I , /•, , S. I .5 * TABLE OF CONTENTS SECTION I PAGE .1.1. SITE PREPARATION ..... ..;.................................................... ... ....... ...................................I 1.2. BASEMENT EXCAVATION ' I I ,13 PAD GRADING I 1.4. FIELD OBSERVATION AND TESTING 2 1:5. LABORATORY TESTS :............. .................. ............... ........................................ .• ..2 I I 6 REMAINING WORK 3 1 7 CONCLUSIONS 3 1 8 LIMITATIONS 3 1 ATTACHMENTS 1 PLATES Plate I Field Density Test Locations - Plate 2 Field Density and Laboratory Compaction Test Results I , I - - I - I - - I - SOU. 8. '5yG INC San Diego Office Indio.Office I P H 0 N E P.O. Box 600627 PH 0 N E " 83-740 CitrusAvenue (619) 280-4321 .' - - . (760)\775-5983 - - San Diegp, CA 92160-0627 Suite G (877)2154321 6280 Riverdale Street (877)2154321 Indio CA 92201-3439- FAX San Diego, CA 92120 FAX '(619) 280-4717 , www.scst.com (760) 775-8361. www.scst.com 0 1 April 3 2006 SCS&T 0612093 ReportNolR / I Mr. David Wright - , Michael Crews bevelopment -• .- S s ' ', -f c ' 939 South Andreasen Escondido, California 92029 Subject AS-GRADED GEOTECHNICAL REPORT I MA1'CHPLAY AT LA COSTA •, '' ' .• . " . '• - •-- ' 2523 NAVARRA DRIVE 'CARLSBAD, CALIFORNIA I GRADING PERMIT NO GRO5-0077 Reference Geotechnical Investigation Proposed Condominium Development Lot 41 Navarra I , Drive Carlsbad California" prepared by Western Soil and Foundation Engineering Inc.; dated Auguét 5, 2004. I Dear J. Mr. Wright I This report has been prepared to summarize the results of the in-place density tests and I observations performed on the building pad at the subject site by Southern California Soil and Testing, Inc (SCS&T) Testing and observation were performed between March 16 and 28 2006 11 SITE PREPARATION Site preparation began with demolition, cleanng -and grubbing of deleterious material fron the I development area.,Most of the material generated from these operations was exported from the -. • ,,, site. ', • . •, 'S , • -- .. ' . •-• .• i.2. BASEMENT EXCAVATION I The basement excavation was performed for the partial underground parking structure Shoring was placed where temporary-slop es could not be constructed The shoring consisted of typical beams and lagging Shoring operations were not observed by SCS&T during placement 1 1 3 PAD GRADING As outlined in the referenced report, the entire building pad area and was over-excavated to a minimum depth of 5 feet below the proposed bottom of footing elevation and a minimum of 5 feet outside the proposed building envelope The over-excavation was performed to create a uniform I I Michael Crews Development - : April 3, 2006 Matchplay at La Costa ': . ScS&TNo. 061293-1R 1 . Page 2 condition beneath the proposed structure and lessen the potential for differential settlement I However, back-cut requirements for the excavation in non-shored areas along the southern property line necessitated removals extending only 3 foot outside the proposed building envelope. The bottom of the removal area exposed terrace deposits Subsequent to the removals the excavation bottoms were scarified to a depth of 12 inches I moisture conditioned and compacted until field density tests indicated a minimum of 90 percent of maximum dry density, determined in accordance with ASTM 0 1557 laboratory test method The I soils generated from the removal operations and on-site cuts were placed in the removed areas as uniformly compacted fill material Typically, fill soils were placed in thin moisture conditioned lifts and compacted to a minimum of 90 percent relative compaction Compaction vas achieved by I means of a Caterpillar 980 rubber tire loader This process continued until planned elevations were reached. 1.4. FIELD OBSERVATION AND TESTING A representative of SCS&T performed field observations and density tests during the grading I operations at the locations shown on Plate No 1 The density tests were performed according to ASTM 02922-01 (nuclear gauge) procedures The results of these tests are shown on Plate No 2 I The accuracy of the In-situ density test locations and elevations'is a function' of theacôuracy of,the S - . S survey control provided by other than SCS&T representatives. Unless" otherwise noted, their locations and elevations were determined by pacing and hand level methods and should be I considered accurate only to the degree implied by the method used I As used herein the term "observation" implies only that we observed the progress of work we were involved with, and performed field density tests which in conjunction with our observations, were the basis for our opinion as to whether the work was performed in substantial conformance With the I geotechnical recommendations, thidthe requirements of the applicable agencies. .• . 1.5. LABORATORY TESTS 'S., . • - / • S Maximum dry density determinations were performed on representative samples of the soils used in the compacted fills according to ASTM D 1557, Procedure A The results of these tests presented on Plate No 2 were used in conjunction with the field density tests to determine the degree of relative compaction of the compacted fill The expansive potential of the fill soils within the upper three feet of finish grade was determined 'using UBC Test Method 18-2. The results of the tests are shown on Plate No. 2. The results of these tests indicate non-detrimentally expansive soil conditions S •• .'. S • •'•• •• 1111 [1 Li. I 1 Michael Crews Development Apnl 3 2006 Matchplay at L'a Costa• SCS&T No. 061293-1R I Page '11.6. REMAINING WORK I The following operations remain to be completed It is recommended that field observations and relative compaction tests be performed during these operations to verify that these operations are I being performed in accordance with job requirements 'and local gréding ordinances Removal and recompaction of driveway entrance tie-in to existing street I ' • Final grading of the driveway entrance and concrete flatwork Backfihling the underground utility, trenches 1 11J.' CONCLUSIONS Based on our field observations and the in-place density test results,t is the opinionof SCS&T that • - - the grading work was performed substantially in accordance with the recommendations contained in the referenced geotechnical reports the City of Carlsbad Grading Ordinance, the I Grading/Improvement Plan Drawing Number 431-2A and the California Building Code Minimum recommendations for the design of the foundations as presented in the referenced report, remain i applicable .1.8. LIMITATIONS 1 This report covers only the services performed between March Wand 28 2006 Our opinions presented herein are based on our observations and the relative compaction test results and are I limited by the scope of the services that we agreed to perform Our services were performed in r accordance with the currently accepted standard of practice and in such a manner as to provide a reasonable measure of the compliance of the gçading operations with the job requirements No I - warranty, express, or implied, is given or intended with respect to the services' which we have - - performed, and neither the performance of those services,nor the submittal of this report should be construed as relieving the contractor of the responsibility to conform with the job requirements Our services were generally performed on an "on-call" basis Therefore the in-place density tests performed by our field representative can only be construed as representative of the areas tested, which are, shown on the attached plates I I I , I - JOB NAME: Match Play JOB NUMBER: 0612093 TEST ELEVATION MOISTURE DRY DENSITY SOIL REL.COMP. NO. DATE LOCATION (feet,MSL) (percent) (p.c.f.) TYPE (percent) 1 3/16/06 Parking Area 62.5 8.0 129.4 1 97.7 2 3/16/06 Parking Area 62.0 8.4 120.3 1 90.8 3 3/20/06 Building Pad 62.0 11.6 122.2 1 92.2 4 3/20/06 Building Pad 62.5 11.0 123.1 1 92.9 5 3/20/06 Building Pad 64.5 10.4 122.5 1 92.5 6 3/21/06 Building Pad 66.5 8.6 111.4 1 84.1 7 3/21/06 Retest #6 66.5 10.6 119.2 1 90.0 8 3/21/06 Building Pad 62.5 9.7 124.2 1 93.7 9 3/22/06 Building Pad 63.5 16.7 .. 113.6 1 85.7 10 3/22/06 Retest #9 63.5 13.8 119.9 1 90.5 11 3/23/06 Building Pad 65.0 13.6 114.1 3 91.1 12 3/23/06 Building Pad 67.0 13.8 112.8 3 90.1 13 3/24/06 Building Pad 61.5 9.2 126.5 1 95.5 14 3/24/06 Building Pad 63.5 12.0 120.5 1 90.9 15 3/27/06 Building Pad 64.0 8.6 116.5 3 93.1 16 3/27/06 Building Pad 66.5 8.5 117.7 3 94.0 17 3/27/06 Building Pad 67.0 8.1 127.6 1 96.3 18 3/27/06 Building Pad 66.5 8.8 125.8 1 94.9 19 3/28/06 Building Pad 68.0 10.8 118.5 2 90.3 20 3/28/06 Building Pad . 68.0 11.1 116.5 3 93.1 21 3/28/06 Building Pad 68.0 9.5 121.2 1 91.5 Soil Maximum Optimum Type . Soil Description Density. pci Moisture. % 1 Brown Sand w/Trace Clay and Gravel 132.5 7.9 2 Brown Sand w/Trace Gravel 131.3 8.7 3 Brown Silty Sand w/Clay 125.2 9.7 F EXPANSION SAMPLE EXPANSION EXPANSION TEST SAMPLE LOCATION .. INDEX POTENTIAL El 1 Building Pad 41 Low PLATE NO. 2