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obtained within the four weeks allowed for preparation Similarly, we <br /> have assumed that the subcontractors can be mobilized in September <br /> and will be available at the scheduled time <br /> Task 2: Excavation and Bachf filling <br /> Because only a small amount of soil will require excavation, the actual <br /> excavation should be completed quickly However, because shoring <br /> may be required, a one-day contingency has been allowed for the <br /> excavation process Backfilling is expected to require one to two days <br /> Task • Aeration <br />' As described in Section 5 the aeration process will consist of two steps <br /> the initial start-up period (where approximately 120 cubic yards of soil <br /> will be added to the soil already being aerated on a daily basis), and the <br /> actual aeration period The start-up period is expected to last no more <br /> than 10 days, and the initial aeration period has been set at four weeks <br /> Two two-week contingency periods have been allowed for the aeration <br /> process, because the weather will have a significant impact on how <br /> quickly the soil dries and how quickly the constituents of concern are <br /> remediated This estimate also includes the time required to analyze <br /> confirmation samples from the aerated soil <br /> It should be noted that this time estimate assumes that the aeration can <br /> be completed prior to the full on-set of the rainy season, if this is not <br /> the case, the project would have to be shut down for approximately <br /> four to five months? (late November through mid-March), and the <br />' schedule would be delayed correspondingly <br /> Task 4a Ground Water Extraction <br /> The ground water extraction program would occur concurrently with <br /> the aeration program The actual ground water extraction process is <br /> scheduled to occur immediately after the excavation and backfilling <br /> have been completed It has been assumed that the extraction process <br /> can be completed in one week Because the excavation process will <br /> likely remove some soils below the ground water table, a greater level <br /> of cleanup will result if ground water extraction is delayed until that <br />' removal has been completed <br /> 7 During the main portion of the rainy season, it is likely that the rains will be so frequent <br /> that the aeration time will be extremely limited <br /> i <br /> 6-2 <br />