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0 <br /> 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 Testin2 : A representative from this office or <br /> our parent corporation, The Twining Laboratories, Inc. , should be <br /> present 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 /> certification of conformance to project compaction specifications <br /> can be given . This additional service is not, however, part of <br /> this current contractual agreement. The 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 /> The Foundation Engineers, Inc. <br />