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Project No. 9929.G Geotechnical Invesrigation/Vineyard Avenue, Pleasanton S August 2003 lean concrete where the trench enters/exits the building perimeter. This impervious seal should extend a minimum of 2 feet away from the building perimeter. 69. Utility trenches extending underneath all traffic areas must be backfilled with native or approved import material and compacted to a minimum relative compaction of 90% at a moisture content above optimum to within 6 inches of the subgrade. The upper 6 inches should be compacted to a minimum of 95% relative compaction in accordance with Laboratory Test Procedure ASTM D1557-91. Backfilling and compaction of these trenches must meet the requirements set forth by the City of Pleasanton, Department of Public Works. Utility trenches within landscape areas maybe compacted to a relative compaction of 85%. Proiect Review and Construction Monitoring 70. All grading and foundation plans for the development must be reviewed by the Soil Engineer prior to contract bidding or submitted to governmental agencies so that plans are reconciled with soil conditions and sufficient time is allowed for suitable mitigative measures to be incorporated into the final grading specifications. 71. TERRASEARCH, inc., should be notified at least two working days prior to site clearing, grading, and/or foundation operations on the property. This will give the Soil Engineer ample time to discuss the problems- that may be encountered in the field and coordinate the work with the contractor. 72. Field observation and testing during the grading and/or foundation operations must be provided by representatives of TERRASEARCH, inc., to enable them to form an opinion regarding the adequacy of the site preparation, the acceptability of fill materials, and the extent to which the earthwork construction and the degree of compaction comply with the specification requirements. Any work related to the grading and/or foundation operations performed without the full knowledge and under the direct observation of the Soil Engineer will render the recommendations of this report invalid. This does not imply full-time observation. The degree TERRASEARCH, inc Page 30 of 53