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Clean fill material will then be used to fill the excavation around the riser pipe to grade, as <br /> described in Section 2 8 The annular space around the vapor observation point will be sealed <br /> below grade using hydrated bentonite, and the observation point will be protected at the <br /> surface using a truck-rated traffic box. <br /> 2.3.5 Backfilling and Site Restoration <br /> Following installation of the vapor observation point, the excavation will be backfilled and <br /> ecompacted (Figure 3) The excavated area above the pea gravel will be lined with PVC <br /> geomembrane to prevent influx of fine grained native soil into the excavation and to prevent <br />' leakage of vapor from the backfill material into the pea gravel <br /> Clean backfill material will be tailgated into the excavation in six inch loose lifts The lifts <br /> will be compacted using a mechanized compactor Water spraying will be performed as <br /> necessary, in conjunction with the compaction, to obtain a minimum wet compaction of 90 <br /> percent Standard Proctor density Compaction is required to prevent settlement of the area <br /> Compaction testing will be performed at the rate of approximately one per five lifts to verify <br /> the required compaction is achieved Copies of the compaction test results will be provided <br /> in the post-construction report. <br /> The backfill will be compacted to a depth of approximately 6 inches below grade A second <br /> PVC geomembrane will be set on top of the compacted fill and extended approximately one <br /> foot beyond the excavation in all directions An asphalt cover will then be installed over the <br /> ' geomembrane to seal the surface <br /> 2.3.6 Sol! Disposal <br /> Once the stockpiled soil has been characterized, a determination will be made regarding the <br /> method of disposal I€ the analytical results are within acceptable levels, the impacted soil <br /> will be transported to a soil recycling facility. Once the soil is recycled, the generator will <br /> obtain a Certificate of Destruction from the recycling facility. If analytical results are above <br /> acceptable levels, the impacted soil will be transported and disposed at an appropriate <br /> disposal facility Soil that is not impacted may be used as backfill material at the facility or <br /> be shipped to a recycling/disposal facility, at the discretion of Van Den Bergh Foods <br /> MZ/1 1-29-94/UST/94-0201 nbr 6 <br />