ARCHIVED REPORTS_XR0008135 - Laserfiche WebLink

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soil overburden will be removed with a backhoe and bulldozer and segregated for later replacement. Approximately 7500 cubic yards of contaminated soil will then be excavated using a backhoe. A loader will then either load the material into trucks or transport the material directly to the landfarming area, depending on the distance to the available on-site location. When the contaminated soil has been removed, a second excavation will be used to generate fill for the first excavation to allow immediate closure and paving of the site. This clean fill and the clean overburden soil will then be returned to the first excavation, graded, and packed. 6.3.2.3 Landfarming Landfarming includes treating soils with nutrients and water in order to promote the natural aerobic bacterial degradation of hydrocarbon contaminants in the soil. Landfarming at the site will be carried out on several acres of available space where the total amount of diesel containing soil can be laid out in an even 1-foot thick layer. To prepare the location for the landfarming operation, existing fine silt/clayey soils will be used to create a one foot thick cap over the entire landfarming surface to prevent infiltration of the water used to promote bacterial growth. The contaminated soils will be placed on this pad, disked biweekly, watered, and allowed to aerate for several months. The surface of the soil will be watered as necessary to moisten the soil and prevent ezcessive particulate emissions. The soil will be tested monthly for TPS diesel concentrations, and once the concentrations are below 100 ppm diesel, the soil will be used for clean fill on site. After remediation is complete, the pad mould be tested to detect if contaminants have leached into the pad. rn any event the pad itself will be disked and otherwise treated to return it to its original service. 6-11 BS/0204b