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<br />, <br /> <br />, <br /> <br />, <br /> <br />Ms. Jackie L. Malcobn, P.E. <br />May 21, 1984 <br />page 2 <br /> <br />. <br /> <br />. <br />(3) orill 2 holes a:ljacent to the holes in the dam to a depth approximately <br />10 feet above the base of the dam. These !-Dles will not be sampled. <br /> <br />(4) Install slotted 1 1/2-inch diameter plastic pipe in all holes to facili- <br />tate groundwater measurerrents. The pipes in 2 !-Dles at the toe of the <br />dam will be perforated in be<lrock and a bentonite collar will be placed <br />above the bedrock to check fOr possible artesian groundwater pressure at <br />the toe, <br /> <br />(5) Corduct a laboratory testirg prO;)ram to evaluate the classifications, <br />swell or consolidation and moisture-density relationships of samples <br />taken durirg drillirg. One ~et of consolidated-undrained (pore pressure <br />monitored) triaxial shear st,ength tests will be perfonned on the <br />existing embankment fill. <br /> <br />(6) Analyze the results of the held ard laboratory investigations to <br />evaluate the stability of th~ d~n Eor steady state seepage (with and <br />wi t!-Dut earthquake) and rapiC! dra....oown conditions to arrive at an embank- <br />ment geanetry meeting requirEld safety factors. The downstream slope will <br />be analyzed in its present c~nfiguration and a new configuration of the <br />upstream slope will be devel~ped for analyses. Internal embankment <br />seepage will be asst.rned to o<:cur accordirg to theoretical relationships <br />for a hanogeneous earthfill <:lam. Soil strength parameters will be <br />selected on the basis of the triaxial test results and published <br />strengths Eor general soil types and standard properties, <br /> <br />(7) Prepare a report presenting ~ geolO;)ic and seismic exposure evaluation, a <br />summary of the data collecte(j and our conclusions and recommendations. <br />Embankment slope geometries ~nd drainage provisions will be included in <br />typical cross-sections in th~ embankment. The field investigation and <br />report preparation will be c~nducted under the supervision of a <br />registered professional engineer. <br /> <br />(8) Following drainage of the re~ervoir, 10;) approximately 10 test pits <br />excavated with a backh:>e provided by others. Conduct a laboratory <br />testing prO;)ram to classify the soils sampled in the pits and prepare a <br />letter report to present the data and our opinions regarding suitability <br />of these soils Eor use as embankment Eill materials. <br /> <br />Fee: Since the ..ork required to accomplish the outlined investigation cannot <br />be accurately deEined in advance, we propose our fee be based on our hourly <br />and unit costs in accordance with the attached Fee Schedule and General <br />Conditions. please note the General Conditions on the reverse side contain a <br />limitation of Chen & Associates' liability. Accordingly, we estimate our <br /> <br />chen and associates <br />