SITE INFORMATION AND CORRESPONDENCE

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�i �� p I � le.a�nup Decision * Y � mmv Fact Sheet i The human health risk assessment determine lhaf fte -ccrataminaLed soil must be cleaned up to an incremen- �� tat cancer risk less than 1 V for DDT,DDI aaa� Tfie latid.�rse for Site l4 is industrial,while the land use �� I�. for Sites 5G, 5H,and IAS-9 is recreationaRMas"eca ties _la nse scenarios,the cleanup goal is 3 milligrams per kilogram combined DDT DDD,and vamliigra�m per kilogram for Site 5H_ A cleanup 32R I� goal of 4.5 milligrams per kilogram has been seifur sttitntteSG to ensure that the cumulative risk due to arsenic found in the soil is below I in 1 mitort � ) rtes 4,561-and5H to these.levels will reduce -asa rsifid �, �I the potential cancer risk to I in 1 million(1 ' °yrs f e bTCP s range of acceptable human health risk. 3,- y. g ; Placement of a cap on IAS-9(road)will elosure pathways,thereby reducing human s � � ash I in I million(10-6). health risks to below - NATURE OF DDT DDT is an agriculturalpesticide.esticide. Its use was banned in the United States in 1972 but it is still used in other areas of the world. DDT takes many years to break down in the environment,so although its use was banned in 1972,DDT can still be found in soil in many agricultural areas of the United States. The U.S. Environ- mental Protection Agency classifies DDT as a"probable human carcinogen l'meaning that strong evidence exists to suggestest DDT may cause cancer. The che ical is also documented'to harm wildlife most notably birds. Birds exposed to DDT may lay eggs with very thin shells,which easily crack killing the young inside. DDT's harmful effects are most pronounced in animals at the top of the food chain(such as cattle or hu- mans),because the DDT concentration in the consumed plant or animal accumulates in the animal that preys . on it. Oil j l M SUMMARY OF RISKS TO THE ENVIRONMEN"t Vft"RM N,Aa � �' Just as the human health risk assessment evatutp to people,.an ecological risk assessment evalu- { 1W W6, MRX ates potential harm to animals and the envotpos're to site contamination. The first step in an ecological risk.assessment is a scoping asscsism aTlie�scoptng assessment determines if an exposure WAM pathway exists which could harm the envirtmmeOEM � � ? A scoping assessment was conducted in the spt g of�99i6Jor rtes 4.5G,SH,and IAS-9. The scoping assess- ment showed that the removal of soil in 1994 a munate exposure pathways to the environment at Sites 4,5G, and SH. Therefore,an ecological risk does natxese sites However,the scoping assessment OR I} :j R� showed that exposure pathways to the environment_exia gt a ie�&__9 ;Because a$otential risk to the environment. t .wI M was identified at IAS-9;further ecological rssk aAsesstnent wMEA411 be conducted. 01, '��- ' The ecological risk assessment work will avaIuatK39.4o Ah cap needs to be to eliminate environmental exposure,and(2)the potential for DDT,DDD;and DDE ka trove into the groundwater. 9 A *Words in bold are defined in th.eglossary 7 ja l