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OF mwN <br /> ,• <br /> a r <br /> 4t� , �,b✓ n lea 'nup Decision <br /> Fact Sheet <br /> w� � p zEGN, <br /> 4. <br /> V:wiz <br /> RECOMMENDED CLEANUP METHODS 1F iW96'; <br /> �7"' � <br /> The Navy recommends capping and paving 9 nd�tngolvt ext�a' ction;to treat soils excavated from Sites <br /> 4,SG,and SH. The cleanup methods and emeas <br /> onsorpreferrmg them are explained below. <br /> gzz <br /> E a <br /> Capping and Paving <br /> PP g g <br /> - r <br /> a wed <br /> Ma <br /> Capping and paving creates a physical barne�aetveen eontahated.soil and humans or wildlife. It involves <br /> installing several layers of protective covey.geszgnec� We cul site,then paving the site. Since the <br /> U. <br /> DDT-contaminated soil from Sites 4,5G,auras "beers<excavated and stockpiled this alternative <br /> " a µ <br /> would apply only to the IAS-9 site. Up to 00... l V. require capping and paving. An asphalt cap, <br /> underlain b rock and a thick plastic liner, gat � ,�Ie I F on <br /> y p � ver � "� � tarrunated soil to prevent-the contaminated <br /> .V r_ � <br /> soil from moving. �� <br /> Because capping and paving uses a bamertrevnte contants from moving this method protects human <br /> s' ?„ i� M <br /> health by limiting exposure to soil and dij&`�i are em t noffrif soil and rainwater into surface water. Physi- <br /> cal barriers will be-installed under the outsiie es �h w o <br /> g e prevent animals from burrowing into the con <br /> - <br /> taminatedsoil. � �� WN <br /> Ifi <br /> The cost to cap and pave Site IAS-9 is estutrEateil � is includes the cost of visually monitoring <br /> the paved road over the years to identify an�ealw� 3niepavem�ent. This cost does not include the <br /> installation of biological barriers because ologica]receptors and burrowing depth have not <br /> been defined. Capping and paving IAS-9 wuldGakeip �nnas. The future use of the road would be limited <br /> s�a v",a 4. <br />'f by deed restrictions to ensure the cap rema �laee � <br /> �� <br /> i <br /> Capping and paving would be used at Site 0 SN91b c3ng Vie,.-'wlogieal risk assessment shows that the environ- <br /> ment would be protected by this method. ' .hum nT� M h sk4ssessment for IAS-9 demonstrates that human <br /> health would be protected with this metho �fiV vantages csf pmg and paving IAS-9 are that this method is <br /> y <br /> I <br /> inexpensive compared to the cost of excav� oilromoadurface and treating the soil,while remaining <br /> fully protective of human health and the enronnaent ,`�-thee it would take to cap and pave IAS-9 is very <br /> short compared to other methods. If the e91herat determines that capping and paving IAS-9 <br /> e � M <br /> would not protect the environment,excavagibn would be the recommended alternative for <br /> IAS-9. If only a portion of IAS-9 requiresccavafionlueoolgical risk,then the excavation would be <br /> backfilled and paved,and the remaining setions otheoadaid.be capped and the entire road paved. <br /> *Words in bold are defined in the gl ssaryj <br /> 8 <br />