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3rd Interim Action Construction Report <br />Kimberly-Clark Upland Site <br /> 0121049.080.084 <br />July 30, 2024 2-5 landauinc.com <br />controlled density fill (CDF) or by removal. Any additional abandoned underground pipes (within 75 ft <br />inland of the shoreline) encountered during subsurface activities within the work zone were <br />decommissioned consistent with requirements of the Work Plan by being filled with a CDF or grout plug <br />equal to five times the diameter of the pipe. Additionally, abandoned underground pipes 15 inches in <br />diameter or greater encountered during subsurface activities throughout the Site will be filled with CDF <br />or removed and replaced with quarry spall backfill. <br />Sheet D2.1 of the as-built plans (Appendix A) illustrates abandoned pipes that were decommissioned. As <br />noted on this sheet, the contractor potholed to locate pipes identified on the plans prior to <br />decommissioning; some pipes were not located and may have been previously decommissioned by <br />removal and/or were not accurately depicted on historical plans. Select photographs of pipe <br />decommissioning are included in Appendix D, and include the following: <br />• A 36-inch wood stave pipe at the eastern edge of the Site was decommissioned after being <br />exposed and prior to being filled with quarry spalls. <br />• A 48-inch steel pipe along the eastern Site boundary was capped at its northern end and <br />elevated concentrations of methane were detected when the pipe was cut. The pipe was <br />decommissioned by being filled with grout under the supervision of an industrial hygienist. <br />• A 36-inch wood stave pipe running east/west, just northwest of the existing warehouse was full <br />of water when exposed. A hydrogen sulfide odor was observed. The pipe was decommissioned <br />by being filled with quarry spalls and CDF under the supervision of an industrial hygienist. <br />2.3 Cap Construction <br />Following intrusive activities and general site grading, a low-permeability cap consisting of low- <br />permeability pavement materials was constructed to further reduce surface water infiltration and to <br />prevent exposure of terrestrial ecological receptors. The pavement was graded so that all rainfall is <br />routed to stormwater conveyance system inlet structures. A total of approximately 33.2 acres were <br />capped. The total pavement area includes the originally planned 29.5 acres of pavement, plus an <br />additional acreage at the northern portion of the Site to result in a total pavement area of 33.2 acres. <br />The extent of the capped area and pavement section details are illustrated on Sheets C3.1 and C3.2 of <br />the as-built plans (Appendix A). Photographs of the completed cap are also included in Appendix D. <br />Based on an approximate maximum capping area of 40.84 acres presented in the Work Plan, <br />approximately 81 percent of the maximum capping area of the Site described in the AO has been <br />capped, which far exceeds the 30 percent infiltration reduction performance goal of the Interim Action. <br />2.4 Utility Installation <br />During earthwork activities and prior to cap construction, the project included installation of subgrade <br />utilities to minimize future disturbance of the cap. Utilities installed included a storm drainage system, <br />potable water, sanitary sewer, electrical and communications, and electrical for light poles; additional <br />subsurface foundation installations were required for light pole installation and other aboveground <br />utility infrastructure.