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Groundwater Monitoring Well Construction Diagram <br /> MW28 <br /> Ground Surface lY" <br /> IA - <br /> 8" <br /> Traffic rated manhole cover <br /> Min 3" casing protrusion capped with lock <br /> a <br /> Surface concrete seal <br /> Annular Seal <br /> (Bentonite Cement Slurry) <br /> Bentonite Seal <br /> Minimum diameter borehole <br /> 5' <br /> 2" Sch 40 PVC casing <br /> 10' Groundwater level <br /> Sand Pack(No. 3 Sand) <br /> 0.01 slot size screening on Sch 40 PVC <br /> 20' <br /> Figure 7: Well Construction <br /> Frontier Transportation <br /> 425 Larch Road <br /> Tracy, CA <br /> DRAWN BY DATE- PROJECT'. <br /> DR March 2010 Frontier. 01 <br /> t� Arni Adini <br /> I� & Associates, Inc. <br />