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HomeMy WebLinkAboutHDP 91-23; WELDON RESIDENCE; UPDATE GEOTECHNICAL AND COASTAL REPORT; 1990-01-301 550 Hotel Circle North San Diego, California 92108 (61 9) 294-9400 Fax: (619) 293-7920 January 30, 1990 Project No. 8851329E-UDP2 Mr. Charles R. Weldon Southwest Law Center 12749 Norwalk Boulevard Suite 104, Box 1110 Norwalk, California 90651 Woodward-Clyde Consultants UPDATE GEOTECHNICAL/COASTAL REPORT TIERRA DEL ORO PROPERTY CARLSBAD, CALIFORNIA Dear Mr. Weldon: In accordance with our agreement dated January 23, 1990 and signed by you on January 26, 1990, we have made an update study of the subject property. The site consists of Lot 16 of Map No. 3052 in the City of Carlsbad, California and is located on the west side of Tierra Del Oro Street. A Geotechnical Investigation and Coastal Engineering study was made by Woodward-Clyde Consultants (WCC) and a report issued on October 26, 1988. The scope of our update study is to review the previous work, make a general visual reconnaissance of the property, and prepare a letter report. The purpose of the letter report is to document any obvious significant changes in site conditions and to provide additional geotechnical or coastal engineering recommendations, if required. It is our understanding from Mrs. Debra L. Fischer, that the proposed residence has been redesigned so that it lies entirely behind the indicated string lines on the survey and topography plan prepared by Brian Smith Engineers, Inc. and dated September 6, 1988. It is further understood that the main floor elevation will be approximately +45.25 feet and that the lower finish floor elevation will be approximately +36.0 feet (plan datum). EXISTING SITE CONDITIONS The writer made a visual observation of the site on January 22, 1990. This site visit revealed that site conditions are generally similar to those indicated in our October 26, 1988 report. There has been some additional minor erosion of the exposed near vertical terrace bluff (less than 12 inches average) and the cobbles have generally been removed from the exposed sandstone surface (Santiago formation) west of the bluff. The cobble berm in this area has also generally been moved out and spread on the beach and the sandy/cobble beach appeared to be slightly lower than at the time of our previous study. CONCLUSIONS It is our opinion, based on our current understanding of the proposed construction, our review of the previous studies, and our visual observations of the site, that the geotechnical and coastal engineering design recommendations presented in our October 26, 1988 report are still valid for the subject project. The uncertainty and limitations indicated in the report Consulting Engineers, Geologists and Environmental Scientists Offices in Other Principal Cities Southwest Law Center Project No. 8851329E-UDP2 January 30, 1990 Page2 Woodward-Clyde Consultants also apply to this update study. We recommend that WCC review the final grading, foundation, and revetment design plans to verify that the intent of the recommendations presented in our October 26, 1988 report have been properly interpreted and incorporated into the contract documents. If you have any questions of if we can be of further service, please call at your convenience. Very truly yours WOODWARD-CLYDE CONSULTANTS of?(r/4 R.E.14tv LJL/csn cc: Ms. Debra L. Fischer a/ljl6