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<br />~ <br />~. : ':'") <br /> <br />Woodward.clyde <br />Consultants <br /> <br />2.3 TASK 3 - SOILS LABORATORY INVESTIGATION <br /> <br />The proposed laboratory testing program for the remediation program will be conducted <br />primarily to accurately classify the various earth materials encountered in the <br />embankment and foundation and to determine selected engineering parameters for these <br />materials. The actual scope of the testing program will depend on the nature of the soils <br />and rocks encountered during the subsurface investigation. However, the following tests <br />are anticipated based on our current understanding of the project. <br /> <br />Test TWe <br /> <br />Number of Tests <br /> <br />Grain Size Analysis <br />Atterberg Limits <br />Pinhole Dispersion <br />Slake Durability <br /> <br />6 <br />4 <br />3 <br />2 <br /> <br />2.4 TASK 4 . REMEDIAL DESIGN AND REPORT PREPARATION <br /> <br />Based on the results of the field an<l laboratory investigations, possible remedial <br />alternatives will be evaluated. Such alternatives may include the following or similar <br />scenarios: <br /> <br />1.. Installation of a continuous seepage barrier through the embankment and <br />into the foundation such as a soil-bentonite slurry wall or a cement- <br />bentonite slurry wall; <br /> <br />2. Installation of a downstream filter blanket and buttress to intercept <br />seepage and control piping; <br /> <br />3. Foundation grouting to reduce flow into the foundation materials; and <br /> <br />4. Blanketing of rock outcrops and/or other identified potential sinkhole <br />locations in the impoundment with clay and/or synthetic liners to reduce <br />flow into the foundation materials. <br /> <br />92D2:!7P/~7. 06-25-9100:17pmI/PRO/54 <br /> <br />-1- <br />