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2. WORKING PLATFORM CONSTRUCTION <br />To create a working platform, the Contractor cleared vegetation by bulldozing. Loveland <br />Ready Mix had installed a perimeter drain around the proposed slurry wall alignment and in <br />doing so, left a trench approximately six feet deep and 40 feet wide between approximate <br />stations 18+00 and 25+00. WRS Compass had to expand the width of that trench. WRS <br />Compass had to construct an elevated platform at approximately station 26+00 to approximately <br />station 28+00 due to the topography. <br />2.1 Slurry Wall Alignment Survey <br />The slurry wall alignment was staked and surveyed by CDS Engineering Corporation before <br />construction of the slurry wall. The Contractor established construction stationing at 10-ft <br />intervals along the alignment using a tape measure. All stationing referred to in the text and <br />tables of this report used the construction stationing as laid out by the contractor. The as-built <br />slurry wall alignment is shown on Figure 1. <br />2.2 Deviations from the Plans and Specifications <br />The profile drawings in the Lyman Henn design report show various elevated working <br />platform segments located throughout the project. Slurry wall construction needed to occur <br />on a stable and flat working platform from which excavation, backfill mixing, and a backfill <br />placement take place. An elevated platform was shown in these areas to create a separation <br />above the groundwater table. The contractor excavated test pits at locations where the <br />working platform was to be elevated and allowed them to remain open for several days to <br />verify that the ground water was deeper than the required four feet from the working surface. <br />This verification eliminated the need for the elevated working platform. The perimeter drain <br />installed by Loveland Ready Mix possibly contributed to the acceptable groundwater levels. <br />The contractor continued with the slurry wall operations once the proper depth to groundwater <br />was verified. The monitoring wells installed by Loveland Ready Mix, were also used to <br />determine the ground water level at the site. <br />GAPROJECfSUG7021-000 Loveland Ready Mix Slurry Wall\R. Records and Correspondence\R.11 Reports\As-Built report stufl\As-built report_Final.doc 2