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AMERICAN ENGINEERING TESTING, INC. AET Project No. 22-00012 <br /> Based on the conditions found in our borings and test pits, it is possible that the contractor will <br /> encounter groundwater during soil correction. We also observed old sewers or draintile in Test <br /> Pits 2, 5, and 11. It is likely that the excavator will encounter old drain tile during site <br /> preparation. Drain tile is often filled with water and when the tile is broken, significant amounts <br /> of water can drain from the pipe into the excavation. The excavation must be properly <br /> dewatered so that the base soils can be observed and tested, and to allow proper placement and <br /> compaction of new fill. This can likely be performed with sump pits and pumps. <br /> The clayey soils on this site have relatively high moisture contents, and they are very sensitive to <br /> disturbance from construction equipment and worker foot traffic. If the contractor is not careful, <br /> excessive amounts of soil disturbance will occur, requiring remedial subcutting and backfilling. <br /> Stripping and subcutting of the topsoil should be performed using backhoes with smooth-edged <br /> buckets. If very soft clay is below the topsoil, it may also need to be stripped. Filling should be <br /> performed immediately after the subgrade has been cut to the suitable naturally-occurring non- <br /> organic soils. We recommend that construction equipment not travel over the cut subgrade; the <br /> fill should be "pushed" in place with construction equipment traversing the new fill rather than <br /> the clay subgrade. <br /> 6.1.2 Fill Placement and Compaction <br /> The finished floor elevations for the buildings have been set about 3 to 4 feet above existing <br /> grade. Because of the soft clay that we found in our borings, we strongly recommend that the <br /> foundation construction not be started until at least one month after the fill has been completed to <br /> final grade over the entire footprint of each building. This would allow some consolidation of the <br /> soils to occur before footing construction begins,to reduce post-construction building settlement. <br /> We also recommend that you monitor the fill settlement at least twice weekly during this waiting <br /> period, to determine when the settlement has stabilized; the settlement elevation should be shot <br /> to the nearest 0.005 foot. We can assist you in analyzing the settlement data. <br /> Page 11 of 28 <br />