The URL can be used to link to this page

Home My WebLink AboutCT 03-01-02; LA COSTA RESORT AND SPA PHASE 2; GEOTECHNICAL OBSERVATION AND TESTING SERVICES REPORT LOT 31; 2007-01-09&1OOI4- Sladden Engineering 6782 Stanton Ave., Suite A, Buena Park, CA 90621 (714) 5234952 Fax (714) 523-1369 77-725 Enfield Lane, Suite 100, Palm Desert, CA 92211 (769) 772-3893 Fax (760) 772-3895 114 S. California Avenue, Beaumont, CA 92223 (951) 845-7743 Fax (951) 845-8863 15438 Cholarne Road, Suite A Victorville, CA 92392 (760)962-1868 Fax (760) %2-1878 January 9 2007 Project 42.2-5019-2 SBPO7-01-007 La Costa Resort and Spa 2100 Costa Del Mar Road Carlsbad, CA 92009 Subject Geotechnical Observation and Testing Services Report La Costa Resort and Spa Resort Villas - Lot 31 2100 Costa Del Mar Road Carlsbad, California - This report presents the results of geotechnical observation and testing services provided -by Sladden Engineering (Sladden) for the project located at 2100 Costa Del Mar Road in the City of Carlsbad, California The field services described herein were performed between December 12 2006 and January 7, 2007 Geotechnical field testing services provided in, Sladden for this - - - project included observation and compaction testing for construction of the building pad. This letter summarizes our observations and presents the results of our field density testing. SITE GRADING - Sladden provided observation and testing of site grading operations that were performed for construction of the building pad Grading operations included removal of the 18 inches of existing stirficial fill. Following the removal of the surficial fill, the bottom of excavation was., scarified, moisture-conditioned, and compacted. The excavation bottoms were scarified to a depth of 6 inches brought to optimum moisture content and compacted to a minimum 90% of maximum dry density as determined by test method ASThI D 1557-90 The on site excavated soil was then placed in 12" thick lifts and compacted to a minimum of 90% of maximum dry density, as required Compaction was obtained using conventional 'heavy grading equipment FIELD TESTING Field density test were periodically performed to check that compacied fill met project specifications. The field tests were conducted with a nuclear density gauge in accordance with ASTMD2922. Our Geotechnical Inestigation Report dated November 11 2004 presented recommendations for relative compaction of 90 percent for the overlying fill As sho n in Table 1 tests met or - exceeded the requirements for relative compaction. • Results of the field density test are presented in Table 1. Approximate test locations are presented on Figure 1. - ••• • La. Costa Resort and Spa January 9, 2007 •, Page . LABORATORY TESTING The maximum dry density and optimum moisture content for representative samples. of various soil materials were determined in the laboratory in accordance with ASTM D1557. The results were used to calculate the relative compactiOn of fill materials. The laboratOry test results for maximum dry density and optimum moisture content are summarized in Table 1. CONCLUSIONS Based on the 'results of the field density test and other laboratory tests, the grading work associated with the construction of the proposed building was performed in general accordance with the project specifications and our geotechnical recommendations. The work completed under the purview of this report is considered adequate for the intended use. Footings should extend at least 18 inches beneath lowest adjacent grade. Isolated square or rectangular footings at least 2 feet square may be designed using an allowable bearing pressure of., . 2500 pounds per square foot. Continuous footings at least 12 inches wide may be designed using an allowable bearing value of 2000 pounds per square foot. The allowable bearing pressures may be increased by 200 psf for each additional' one foot of'width and 250 psf for each additional 6 inches of depth, if desired. The maximum allowable bearing pressure should be 3000 psf. The allowable bearing pressure are for dead and frequently applied live loads, and' may be increased by 1/3 to, resist wind, seismic or other transient loading. Drainage form the building area should be rapid and complete. CLOSURE ' Professional judgment presehted in this report are based' on evaluation of the technical information gathered, on our understanding of the proposed construction, and in accordance with general accepted soil engineering-and geologic principles and practices., No warranty is express or implied. ' " ' ' ' • ' ' , ' The presence of the geotechnidal consultant at the site was to provide the client with a source of,, professional advice and opinions, based upon testing and observation of the client's work, and did not include superintending nor supervision. The data and conclusion contained 'herein shbuild be considered to relate only to the specific location discussed herein. Sladden is' not responsible for any conclusion or recommendations that may be made by others; unless we 'have been -given an opportunity to review such conclusions or recommendations and concur in writing We hope that this report fulfills the current 'needs of the project. If you have' any questions, or require additional information, please call the undersigned. Respectfully submitted, , ' ' ' , ' ' ' . ' • - SLADDEN EN RING EsSlo& pND Principal Engineer Copies. 6/ La Costa Resort and Spa. Test Date Test T~pe i Approximate Location2 • Approximate Elevation Moisture iContent (%) Dry Unit Weight 1 Soil No. Relative Compaction Remarks I 12/29/2006 N Building Area 41 8 105 1120 1 93 2 12/29/2006 N Building Area 43.O. 11 '.7 1100 I 92 3 1/2/2007 N Building Area 41.8 ' lOS 1901 1 91 4 1/2/2007 N Building Area 430 11 .7 1120 I 93 5 1/3/2007 N Building Area .41-.0 124 1080 I 90 6 1/3/2007 N Building Area 425 JII 1180 2 92 7 1/4/2007 N Building Area 42 5 124 1170 2 91 8 1/4/2007 N Building Area 410 117 1110 1 93 9 1/4/2007 N Building Area 420 10.5', 1090 1 91 10 1/7/2007 N Building Area Subgrade II 1 1120 1 93 I 1/7/2007 N Building Area Subgrade lOS 1150 2 90 12 1/7/2007 N Building Area Subgrade 124 1170 2 91 13 1/7/2007 N Building Area Subgiade 107 1140 1 95