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EXPLANATION OF "YES" AND "MAYBE" ANSWERS <br /> 1 (b) and (c) . The surface impoundments closure activities at <br /> the site will involve one of the four following alternatives: <br /> 1. Excavation and off-site disposal of soil requiring <br /> remediation. The area will be graded and compacted to <br /> provide drainage after the soil is removed. The area <br /> will then be covered with grass seed or sod to control <br /> erosion. <br /> 2 . Leaving the soil requiring remediation in place and <br /> placifig a RCRA cover over the areas of Pond 1 and Pond 2. <br /> The RCRA cover will consists of a one foot layer of sand <br /> cover, a two foot clay cover, and a one foot deep soil <br /> cover, graded and compacted to provide drainage. The <br /> soil cover will be seeded with grass or sod to provide <br /> erosion control. Runoff from the cap will drain to a <br /> cement drainage ditch. <br /> 3 . Moving the soil requiring remediation to an on-site <br /> cell in the Pond 2 area. The RCRA cell will consist of a <br /> high-density polyethylene (HDPE) liner overlain with a <br /> sand blanket or geogrid. The soil will be contained in <br /> an inner liner of 100 mil HDPE. The cell will be topped <br /> with a six inch sand or gravel layer. The entire cap <br /> will be covered with 18 inches of soil and landscaped to <br /> form a protective cover. <br /> 4 . If it is determined that the soil does not pose a <br /> threat to human health or the environment, the soil will <br /> be graded in the Pond 1 and Pond 2 areas to divert <br /> drainage away from the pond areas. <br /> The addition of the clay cap and vegetative cover to the area <br /> requiring excavation of soil will change the topography of the <br /> site, but it will not be a substantial modification. The new <br /> topography on the site will have drainage features constructed <br /> in order that the local precipitation is environmentally <br /> controlled. <br /> J <br />