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I. H. KLEINFELDER& ASSOCIATES <br /> File: W-2019-1 <br /> April 16, 1986 <br /> Page 4 <br /> presented on Plate Nos. 4 through 9 with a copy of the <br /> Unified Soils Classification System (used to identify the <br /> soil) included as Plate No. 3. The soils encountered during <br /> drilling consisted of sandy silt, clayey silt, clay- &silt. <br /> At the time of drilling, free water was encountered between <br /> 11 and 13 feet- in all three borings. <br /> B. Monitoring Well Construction <br /> Ground water monitoring wells were installed in each of <br /> the soil borings, at the locations shown on Plate No. 2 . The <br /> monitoring wells were constructed using steam-cleaned, two- <br /> inch diameter Schedule 40 PVC pipe, with 0.02 inch machine- <br /> slotted screen and flush-threaded joints. In monitoring <br /> wells MW-1 and MW-22, perforated pipe was placed in the <br /> borehole from 40 feet to 10 feet and completed with blank <br /> pipe to the surface. Monitoring well MW-3 was constructed to <br /> a depth of 35 feet -with a screened interval from 35 feet to 5 <br /> feet. In the annulus of all three wells a filter pack of e3 <br /> sand was placed to 2 feet above the perforated interval. A <br /> two foot bentonite seal was placed above the sand pack as an <br /> Impervious seal and the remaining annular space was grouted <br /> to the surface with a neat cement. slurry of five parts <br /> bentonite powder to 100 parts Portland type two cement. <br /> 'Christy boxes were set flush to the pavement to cover the <br /> wells. <br />