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12-8a-1997 9:06af4 FROt.1 ENG. VoEST ELK t-FINE 970 9295050 P 2a <br />NOV 6'97 15:19 FR BARR ENGINEERING 612 832 2601 TO 9295595--0626016 P.05i10 <br />To: Ne~Sveq <br />Proms PhBip 8. SoLeng <br />8aljsae Wac EDc D9m-Landdids <br />Ate Nor.mlat 8, 1897 <br />~eyess OR'[6~ItRwW00t Peas 4 <br />Work Plan <br />Based upon the findings as described in items 1 through 6 and as shown in <br />attached Figure 1 the following is concluded relative to cross section A-A and the <br />respective action items are proposed: <br />(a) Vertical pumping wells appear to be effective near the substation in <br />reducing hydrostatic preaeure and 1 additional well between W-1D and <br />W-lE is recommended to be installed. The pumping well should be <br />~. installed the same as W-1 to a depth of 190 feet. Another well west of <br />W-1 is being considered and will be con5rmed later. <br />(b) A shallow pumping test well between piezotneters B-10 and &11 is <br />recommended to determine the effectiveness of using vertacal pumping <br />Wells (or dewatering wells) to dewater the shallow groundwater. It is <br />recommended that the test well be as follows: 12-inch diameter hole- <br />50 feet deep. 6-inch diameter casing with a 40-foot long screen, gravel <br />pack to within 5 feet of the surface and then grouted the surface. The <br />test weII may or may not yield much water bat it will determine the <br />method and type of dewatering system to be used to dewater the shallow <br />groundwater. <br />(c) Aa in situ shear test of the shear plane st I-7 (49- to 51-foot depth), at <br />I-6 (36- to SS- and ?6- to ?8-foot depths) and at W-1C (102- to 104foot <br />depth) using the borehole shear test device (BHST). Also, obtain <br />thinwall samples at the shear planes identified for laboratory testing. <br />(Note: the borehole sheaz test requires a thinwall sample for preparation <br />of testing). Perform consolidated undrained tria~al testing with pore <br />obssor+~s-ear-vcsr <br />