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Page 12 - #4220 91-1043 <br /> ' should extend at least 10' back into the interior of the addition to minimize, but not <br />• necessarily eliminate, any frost heave of the lab. We also recommend that insulation <br /> (from frost) be provided behind those exteriar portions of the dock walls. <br /> 4.0 CONSTRUCTION DIFFICULTY <br /> �-- We wish to point out that some of the fine alluvium and weathered till are susceptible <br /> to disturbance when subjected to construction traffic, especially when wet. In the event <br /> that disturbance of the naturally deposited soils does occur during excavation, it will be <br /> �.-. necessary to extend the excavation deeper to expose competent undisturbed soils. We <br /> anticipate that use of backhoe excavation equipment will be required to accomplish the <br /> recommended excavation. <br /> The earthwork equipment used for placing and compacting engineered fill should be <br /> carefully matched to the site conditions at the time the work is being performed. The <br />_ engineered fill should be placed in lifts thin enough so that the entire thickness of each <br />. lift can be compacted with the type of equipment being used. <br /> '_ We anticipate that some groundwater may enter deeper portions of the excavation. We <br /> recommend water be removed to facilitate observation of the excavation and fill <br /> v� placement. Since the soils encountered are primarily relatively slow draining, we <br />