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Page -3 <br />P-6x03 <br />CONCLUSIONS <br />Based on our review to date, rt is our opinion that the geotechnical investigation performed by KE for this <br />parcel does not conform to accepted geotechnical standards of practice and the Vineyard Avenue Condor <br />Specific Plan. A number of issues exist which we believe will require the submittal of supplemental <br />documentation. These items are discussed mdwidually below. <br />1. Soil Expansion Potential The existing recommendations for footing foundations and slabs-on- <br />grade may not result in adequate performance if more highly expansive materials are present than <br />indicated by the KE laboratory tests. Either the recommendations should be revised ur addrtional <br />tests performed to verify the results from the adjacent parcels do not extend onto the subject site. <br />2. Existing Fill "Chickncss - KE should further evaluate the thiclrness of the existing fill materials <br />present on the site and discuss the potential consequences ~f substantially deeper than expected <br />materials are encountered during project grading. <br />3. Published Maps - It is unclear which published maps KE has reviewed because only an <br />incomplete listing of citations is provided. KE should list all published maps reviewed, and <br />provide the information they have obtained from the maps. As a minimum, the references listed at <br />the end of this letter should be reviewed and discussed. <br />LIMITATIONS <br />Our services have been performed m accordance with generally accepted geotechnical principles and <br />practices. This warranty is in lieu of all other warranties, either expressed or implied. Our services have <br />been provided at the request of the City of Pleasanton. Ot~r role has been to provide technical assistance to <br />the City as it considers its permit decisions in this application, and we understand our firm is provided the <br />same protection as the Crty under State law. <br />We hope this information is adequate for your needs. Please call the undersigned if you have any <br />questions. <br />Very truly yours, <br />Alan Kropp, U.E. <br />Principal Engineer <br />AK/sa <br />2 No. 487 <br />Exp. 12/31/07 <br />C~TFC H~~~'Pe <br />Copies: Addressee (3) ` <br />Korbmacher Engineering (1) <br />peer review Itr <br />