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Page 19 FE 382-063-00 <br /> around the structures and backfilling with gravel . A network of <br /> perforated pipes , buried in these trenches , collects the gases <br /> and is eventually vented to the atmosphere or burned . An <br /> additional method would consist of a barrier ( membrane ) <br /> construction beneath the structures to prevent gases generated <br /> within the fill, from moving through the fill into the confines <br /> of the structure.. <br /> Control and_Testing: A representative from this office or <br /> our parent corporation, The Twining taboratories, Inc . , should be <br /> p r e se n t At the site during :earthwork activities such as <br /> stripping, excavation, backf ill and compaction . This <br /> representative can provide the necessary testing so that <br /> f certification of conformance. to project .compaction specifications <br /> can be given.. This additional service is not, however, part of <br /> this current contractual agreement. Th-e Geotechnical Engineer <br /> will not be responsible for grades. or staking. <br /> LIMITATIONS <br /> -The recommendations made in this report .are based on the <br /> assumption that soil conditions do not vary significantly from <br /> those- disclosed in the borings: The recommendations also assume <br /> that water is not allowed free access to foundation , slab , or <br /> paved. areas. If any variations or undesirable conditions are <br /> encountered during construction , the Soils Engineer should be <br /> notified so that supplemental recommendations can be made. <br /> Tie Foundation Engineers, Inc. <br />