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Home My WebLink AboutCT 97-09; LA COSTA PLAZA; Addendum 2 Geotechnical Investigation Carlsbad Albertsons Carlsbad, California; 2002-03-12DIAZ•YOURMAN & ASSOCIATES Project No. 300-02 Mr. Mark Steinman Albertsons 1421 South Manhattan Avenue Fullerton, CA 92831-5221 Subject: Addendum 2 Geotechnical Investigation Carlsbad Albertsons Carlsbad, California Dear Mr. Steinman: This addendum provides Diaz•Yourman & Associates' (OYA) additional geotechnical recommendations for the subject site and is based on discussions and/or meetings with the design team and project reviewers. Previously, DYA summarized the results of our geotechnical investigation services for the subject project in our report dated July 3, 2001 (Report; see Bibliography). Addendum 1 to the Report was issued on December 19, 2001. The conclusions and recommendations presented in DY A's Report and Addendum 1 remain applicable unless modified herein. DYA's Report contained the results of our field investigation, laboratory testing, and provided conclusions and recommendations for the proposed Albertsons structure and associated improvements such as Leucadia County Water District (LCWD) sewer, storm drain, and reclaimed water pipelines. As noted in Addendum 1, the proposed Albertsons building site was previously filled and monitored for settlement. The monitoring indicated that the measured settlement was significantly smaller and occurred much quicker than initially estimated by DY A and others. At the time Addendum 1 was issued, the settlement had essentially ceased. Because the Albertsons building site settlement ceased, DY A's initially recommended wick drain ground improvement was no longer necessary. Therefore, Section 4.2.1, Wick Drains, of DYA's Report is no longer applicable. Addendum 1 included revised trench specification tables for LCWD and other project utilities. Addendum 1 also contained revised recommendations for the estimated influence of excavation of trenches on nearby improvements. We now understand that the footprint of the proposed Albertsons building has been reduced since the Report and Addendum 1 was issued. A revised Figure 2 of DYA's Report that shows the reduced Albertsons building footprint is attached. Also, the Albertsons building pad site and other areas of the site (such as along the alignment of the LCWD 30-inch diameter sewer line) are essentially at grade and will not receive significant (less than one foot) additional fill. However, up to six feet of fill will be placed west of the Albertson building pad in future parking and landscaped areas. We recommend that where LCWD utilites will be placed, such as the storm drain pipeline located west of the Albertsons building pad, that the proposed fill be placed and compacted at least 30 days prior to installing the LCWD utilities. This recommendation applies to fill heights two feet or greater. As a minimum, the fill placement area should cover an area at least twice the depth of the utility embedment on either side of the LCWD utility alignment. (For construction sequenci , e en fill can be placed prior to installing the utilities.) The fill should be placed in accord ce with DY A's G:\datafls\PROJECTS\300\300·02\1 Ot addendum 2.doc 1616 EAST 17th STREET SANTAANA, CA 92705-8509 TEL. (714) 245-2920 FA Mr. Steinman Project No. 300-02 March 12, 2002 Page2 Report recommendations and the project plans and specifications. The underground utilities can then be placed by trenching through the engineered compacted fill. Placing fill prior to installing LCWD utilities will minimize the amount of the settlement because of the fill loads. Based on the settlement monitoring from the Albertsons building pad site, we estimate that most of the settlement from new fills should occur prior to placing the utilities. We anticipate that the pipeline settlement should be relatively uniform and small, less than one inch. As discussed in previous meetings with representatives with LCWD, Albertsons, the design team, and LCWD, the project utilities can be installed in accordance with the Standard Specifications for Public Works Construction (Greenbook) and in accordance with Subsection 306-1.4.8, 306-1.4.8.1 through 306-1.4.8.5 of the 2000 Regional Supplement Amendment to the Greenbook. Based on discussions with the project team that included the proposed utility and earthwork contractors, the utilities should be within the settlement tolerances outlined in the 2000 Regional Supplement Amendment to the Greenbook. In summary, the proposed Albertsons building can be supported on conventional shallow foundations supported on ground improved with rammed aggregate piers. Wick drains for the Albertsons building are no longer required. The project utilities, including those for LCWD, can be installed in accordance with the recommendations contained in DY A's Report and addenda and the Greenbook and the 2000 Regional Supplement Amendment to the Greenbook. We appreciate the opportunity to provide our services to you and look forward to working with you on this project. If you have any questions, please call. Very truly yours, DIAZ•YOURMAN & ASSOCIATES AMY:lmw cc: Ms. Meg Carroll -O'Day Consultants Mr. Don Mason -Eleven Western Builders Mr. Steve Deering -Dudek Consultants Mr. Jeff Dierck -Albertsons G:\datafls\PROJECTS\3001300-02\1 Ot addendum 2.doc ======='11- Mr. Steinman Project No. 300-02 Bibliography ,......,., "' .) March 12, 2002 Page 3 Diaz•Yourman & Associates, 2001, Geotechnical Investigation, Carlsbad Albertsons, Carlsbad, California, Project No. 300-01, July 3, 2001. Diaz•Yourman & Associates, 2001, Addendum 1, Geotechnical Investigation, Carlsbad Albertsons, Carlsbad, California, Project No. 300-01, December 19, 2001. Building News, 1997, "Greenbook," Standard Specifications for Public Works Construction. Building News, 2000, Regional Supplement Amendment to the Greenbook., 2000 Edition. G:\datafls\PROJECTS\300\300-02\1 Ot addendum 2.doc =======•= ~ ' .. 0:: 0 u z <( ....J (L w t: (/) I ' \ \ \ I ' EXPLANTION ♦ Approximate Location of OYA Boring ■ Approximate Location of Settlement Monument 0 Approximate Location of Exploration by Others ----------- Previous Albertsons Building I Not to Scale Figure 2 -SITE PLAN ======='1