Laserfiche WebLink
NUV 6'97 I5: 19 FR BRRR ENG]NEERING 6I2 832 2601 TO 9295595--0626016 P.05i10 <br />To: Norm Every <br />Ptolse Philip B. Solwssg <br />6hbisoe w~a Elk Mjns~Laadallde <br />D.to: Novm+h's 6, 1897 <br />ptoleats 08260I4RwW001 P~ae 6 <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 reLitive 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 pressure and 1 additional well between W-1D and <br />W-1E 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 confirmed later. <br />(b) A shallow pumping test well between giezometers B-10 and ]3-11 is <br />recommended to determine the effectiveness of using vertical 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 well may or may not yield much water but it will determine the <br />method and type of dewatering system to be used to dewater the shallow <br />groundwater. <br />(c) An in situ shear test of the shear plane at I-7 (49- to 51-foot depth), at <br />I-6 (36- to 38- and 76- to 78-foot depths) and at W-1C (102- to 104-foot <br />depth) using the borehole shear test device (B$ST). 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 />ocasol~~s+aal-vcsr <br />