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e. Biotic layer - this is made up of cobbles. Sizes ranged from three inches to one foot, <br />which will prevent animals from burrowing into the landfill. <br />f. Filter layers - These consist of two layers of six -inches of imported graded material to <br />prevent the migration of finer soil material from the topsoil and vegetative layers into the <br />biotic layer. <br />g. Topsoil layer - This consists of two feet of silty and loamy soil materials derived from <br />on-site borrow areas. <br />h. Vegetative layer -This layer consists of annual grasses with shallow root that are low <br />maintenance and drought resistant. It will provide a good erosion control and promote <br />drainage. <br />V. POST CLOSURE MONITORING OF PITS 1 AND 7 <br />Post -closure activities will be performed by LLNL-Site 300 or its subcontractors upon <br />completion of closure of the two landfills. These activities, according to the approved <br />post -closure plan and/or post -closure permit, will include: <br />1. Quarterly groundwater monitoring. <br />2. Inspection and maintenance of security requirements (fence, warning signs, etc.), <br />monitoring wells, run-on and run-off control, cover integrity and bench marks. <br />3. Inspection and maintenance of the vegetative cover which includes but not limited to <br />seeding, fertilizing and mowing. <br />4. Compliance with the land use restrictions. <br />LLNL-Site 300 is required to perform these post -closure activities for a minimum of <br />30 years. <br />U.S. EPA, Region 9 (H-3-2) <br />75 Hawthorne Street, 10th Floor <br />San Francisco, CA 94105 <br />Attn.: Vernon Christianson <br />(415) 744-1108 <br />VI. PUBLIC PARTICIPATION <br />Department of Health Services <br />700 Heinz Avenue, Bldg. F <br />Berkeley, CA 94710 <br />Attn.: Virginia Lasky <br />(415) 540-3734 <br />The U.S. EPA and DHS request written comments and may be sent to either EPA or DHS <br />address below by February 8, 1991. <br />