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Home My WebLink AboutX2009-1453 - SoilsI 14og1 Dr. MACTEC PCB: / fl3_ zoo9 CITY OF NEWPORT BEACH BUILOING DEPARTMENT engineering and constructing a better t$ H ESE PLANS DOES NOT II :.TIT HTE EH a S` GR EJ 0 CONSTRUCT ANY BIIL01 G �d101 ON C "-� WIM THE ORDINANCE PEN AND PO CES ifIE GDr d . APPR DVAL COPS VGT CUf r:. EE Th T H _ Pt An A 'V COU'PEANCE WITH O,TY BUILDING AND 7ONI UPDIN 11 ES PL THE CITY F EArORTPEACHR FkV h iT0 JUly24,2009 REVIf0T•[BLI DIN^. rc T I eC BEFORE r1LRING Oli AFTEr CC 1S nUCTI N ,F ") Y 1 ORDIN 'jCES, PLANS AND POLECIES OF THE CITY OF NEWPORT BEACH PERMIT -TES ACKNOWLEDGEMENT, REPA T,firNT SIGNFTLRc Mr. Cary Brooks Senior Project Manager F,, Hoag Memorial Hospital Presbyterian Gs.DIN S' GNAT'URE1 500 Superior Avenue, Suite 300 _ Newport Beach, California 92663 BY Subject: Revised Geotechnical Recommendations Proposed Lower Campus Temporary Parking Hoag Memorial Hospital Presbyterian One Hoag Drive Newport Beach, California MACTEC Project 4953-09-1121 Dear Mr. Cary: As requested, this revised letter presents geotechnical recommendations for support and earthwork for the proposed Lower Campus temporary parking at the Hoag Memorial Hospital Presbyterian in Newport Beach, California. This revised later supersedes our July 23, 2009 letter. We have been provided Sheets CI.00, C1.01 and C1.02, C2.00 and C2.01 prepared by Halladay & Mim Mack, Inc. for the proposed temporary parking. Our predecessor firms of LAW/Crandall, Inc. (LAW) and LeRoy Crandall and Associates (LCA) previously performed numerous geotechnical investigations at the hospital campus; a number of our prior projects are in the immediate vicinity of to the proposed project. The results of the prior pertinent geotechnical investigations are presented in the following reports: • Employee Child Care Center, report dated April 20, 1990 (LCA Project No. 089083.AEB). • Hoag Cancer Center; report dated May 26, 1987 (LCA Project No. AE-87147) • Preparation of Master Plan and Environmental Impact Report; report dated May 20, 1991 (LCA Project No. 089034.AEO). Data from the prior pertinent subsurface explorations adjacent to the proposed improvement as presented in the prior reports referenced above are considered applicable for the proposed improvements. We accept responsibility for the use and interpretation of the data presented in these reports, and we concur MACTEC Engineering and Consulting, Inc. 5628 East Slauson • Los Angeles. CA 90040.4554 • Phone: 323.889.5300 • 323.889-5398 www.mactec.com Hoag Memorial Hospital Presbyterian -Geotechnical Recommendations July 24. 2009 MAC7'EC Engineering and Consulting, Inc.. Project 4953-09-/ /2/R with the interpretation of data as presented in the reports. No new borings were drilled for this geotechnical consultation. It is planned to provide temporary parking located north of the existing ATP Building and west of the existing Cancer Center at the Lower Campus at the Hoag Memorial Hospital Presbyterian. We understand that the proposed temporary parking will only be used temporary for construction equipment and vehicles, and is not intended to support future development. It is planned to use a 3 inch thick layer of gravel or crushed rock for the proposed temporary parking. The proposed temporary parking will have a stabilized construction entry and a chain link fence with height of about 6 feet with green fabric screen as enclosure. In addition, the existing storm drain riser located at the center of the site is to remain and protected with the placement of temporal concrete K-rail barrier surrounding the storm drain riser. The proposed temporary parking will require the removal of existing granite ditch, area drain, vegetation and on -grade irrigation system. We understand that wet and soft soil conditions were previously encountered due to excessive irrigation but have since dried off. To provide support for the 3 inch layer consisting of gravel or crushed rock for the temporary parking, it is recommended that existing vegetation excavated and removed. The exposed soils should be carefully observed for the removal of all unsuitable deposits. Next, the exposed soils should be proofrolled to detect soft soils which should be removed. Next, the exposed soils should be scarified to a depth of 6 inches, brought to near -optimum moisture content, and compacted. At least the upper 12 inches of the exposed soils should be compacted to at least 90% of the maximum dry density obtainable by the ASTM Designation D1557-07 method of compaction. The onsite soils, less any debris or organic matter, can be used in required fills. Cobbles larger than 4 inches in diameter should not be used in the fill. Any required import material should consist of relatively non -expansive soils with an expansion index of less than 35. The imported materials should contain sufficient fines (binder material) so as to be relatively impermeable and result in a stable subgrade Hoag Memorial Hospital Presbyterian—Geotechnical Recomendalions July 23, 2009 MACTEC Engineering and Consulting, Inc., Project 4953-09-1121 when compacted. All proposed import materials should be approved by our personnel prior to being placed at the site. Excavations should be observed by personnel of our firm so that any necessary modifications based on variations in the soil conditions can be made. All applicable safety requirements and regulations, including OSHA regulations, should be met. It has been a pleasure to be of professional service to you. Please call if you have any questions or if we can be of further assistance. Sincerely, MACTEC Engineering and Consulting, Inc. Lan-Anh Tran Project Engineer Marshall Lew, Ph.D. Senior Principal Engineer Vice President P:14953 Geotech12009-proj191121 Hoag Lower Campus Stoope & PCH14.1 Reporrs14953-09-1121L0I.doclLT:tm (6 copies submitted)