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<br />3.0 SITE ACTIVITIES <br />3.1 Pre-Coustructiou Activities <br />' Prior to construction, the former Pond 3 was drained to remove free-stan~ing water in the <br />proposed berni area. In addition, accumulated sludge in the bottom off the pond was <br />washed off the existing synthetic liner. A portion of the existing liner system then was <br />cu[ and removed to expose the underlying soil within the proposed ~ootprint of the <br />' divider berm. The underlying soil was scarified to provide a workafble surface for <br />compaction, and berm construction proceeded in accordance with tl~e Construction <br />' Specifications provided in the Conceptual Design Report. No additional disturbance was <br />created at the site as a result of berni construction, since all constn~ction activities <br />' occurred within areas adjacent to the former Pond 3 that had been disturbed by previous <br />facility construction. <br />' 3.2 Berm Compaction <br />' The berm was constructed using primary fill stockpiled a[ [he site. T~re primary fill <br />originated from the Santa Fe Formation and was excavated and hauled in ~rom the on-site <br />' source location and stockpiled adjacent to the ponds. The results of a p¢eliminary field <br />classification indicated that the soil was sandy clay with less than l0percent of the <br />' particles retained on a 3(8-inch sieve and greater than 20 percent of the p~rticles retained <br />on the #4 (0.187-inch) sieve. All material larger than 3 inches in size wa~ removed from <br />' the fill prior to compaction. <br /> <br /> <br />1 <br /> <br /> <br />1 <br />Modified Proctor compaction tests (ASTM D1557 Method B) were perfo~rried on site to <br />establish the maximum dry unit weight, yd,,,,ax, and optimum moisture content, w°P,, for <br />each of the two soils. The results of the compaction tests are illustrated in (Figure 2 along <br />with the acceptable compaction zone based on the following requirements for the relative <br />density (Dr) and compaction moisture content (w) specified in [he Conceptual Design <br />Report: <br />• RELATIVE DENSITY: Dr > 90% (i.e., yd = 0.9yd,max) <br />• MOISTURE CONTENT: w°P, - 1 % < w < w°P~ + 2% <br />Snn Luis Project 4 <br />p ~pmr¢n~bmgbnnivup(lglwuar vmrmendrnndAe.miei M1udr rgrortdor <br />GeoTrnes, Inc. <br />Februmy 2D01 <br />