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3.5 BACKFILLING AND COMPACTION <br /> Upon receiving confirmation that the concentrations of diesel <br /> remaining in the soil after overexcavation have been reduced to <br /> " less than 100 ppm, DECON will backfill the entire excavation to <br /> grade. [Note: If overexcavation does not reduce the concentra- <br /> tions of diesel present to less than 100 ppm, a revised work plan <br /> will be submitted to the San Joaquin County Environmental Health <br /> Department. ] <br /> The lower 'portion of the excavation will be backfilled with clean <br /> fill dirt and compacted using a Bomag sheepsfoot roller. The <br /> stockpiled soil removed from the excavation which contains less <br /> than 100 ppm of diesel will then be used to bring the excavation <br /> up to grade. This soil will be compacted to at least 90% of its <br /> maximum dry density using a Bomag sheepsfoot roller. <br /> 3 .6 WATER RECYCLING OR TREATMENT <br /> Final disposition of the collected rainwater will be based on the <br /> analytical results received for the composite sample described in <br /> Section 3 . 3. If the water contains TPH-Diesel and BTEX at concen- <br /> trations which are acceptable to the POTW that serves the Stockton <br /> Steel Facility, the water will be discharged directly into a nearby <br /> sanitary sewer outfall. If the water contains TPH-Diesel and/or <br /> BTEX at concentrations which exceed the POTW discharge standards, <br /> it will be profiled into a nearby fuel/water recycling facility. <br /> Upon profile acceptance, it will be transported by vacuum truck to <br /> the recycling facility. <br />