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E ' <br /> OF P <br /> De <br /> Cleanucision <br /> r ° � �y�6yyp <br /> * ba Fact Sheet <br /> DESCRIPTION AND MSTORY OF NCS STOCKTON tp <br /> NCS Stockton,located on Rough and Ready. �s 'ftt�of he ty of Stockton in San Joaquin County, <br /> California. The installation was a naval sup ily.A of.. �sr�d�War II through 1965, and the Navy currently <br /> i� <br /> operates a communication station on the island rariousudusialiiind maintenance operations have generated <br /> t <br /> waste at NCS Stockton,and a variety of wastedaspmsaitices have been used. <br /> N� <br /> dei <br /> t���tocktc�n lCnowat to,have Iugh DDT levels. Figure 1 on page <br /> The following paragraphs describe the sites <br /> 4 shows the location of each site. Page 7 descry es a attune 0 T. <br /> Sites 4,5G,and 5H <br /> _ " <br /> Site 4 the former General Services Admimstra tn,, SA ?�aniaged Container Storage Area,was used from <br /> 1972 to 1983 to store damaged or leaking contnmers � nactive�ite was a;paved area; access is restricted <br /> 3 <br /> with a fence and locked gate. Materials-stnts,thinners,solvents,lacquers,and pestiEMY <br /> - <br /> � �a �` <br /> cider including DDT. <br /> z <br /> r � <br /> Site 5G is an open,unlined drainage ditch. fUibeee :d rats ase 'ater carrying DDT-contaminated soil from <br /> taaunated soil then settled to the bottom of the <br /> Site 5H washed into the Site 5G drainage dWmgi� e � <br /> ditch. Soil samples from Site 5G also iden <br /> � XW <br /> } et .p <br /> .pesticide storageiu $` dhe° round <br /> Site SH includes an inactive. mg soil. Pesticides were mixed and <br /> � a p <br /> stored at Site 5H. A mixture of water,pestifeers�ait3 orcaer,"and DDT was reportedly poured on the <br /> ground when spray tanks were rinsed at SiteH x <br /> art of its site investigation in 1992,thewavisaples collected from Sites 4, SG,and SH. The <br /> As <br /> p 1��NNNWVVE4s � M <br /> analytical results showed levels of DDT that sus n Unim lc to human health and the environment. In <br /> response to these hi DDT levels the Na + ntiucmp­ <br /> 'emov aNg <br /> t" ti at Saes 4,SG,and SH in 1994. The, <br /> removal action involved excavating soil.thadt"6 oaf DDT. A total of 2,160 cubic yards of soil <br /> was excavated and is currently stockpiled unc°lerrivecoverstn the central portion of NCS Stockton(Figure <br /> 1). The excavations at Sites 5G and 5H wrem tee w t earl soil brought from an off-site location;the <br /> �te� 4II I <br /> excavation at Site 4 will be backfilled with =caya �oil°a er he soil has been treated. Because the DDT- <br /> . �. s������ <br /> contaminated soil was removed, Sites 4,SG;�n��"zi�ongcr�p©seta�iuman health hazard associated with DDT. <br /> The stockpiled soil however must be treateci , D ' � �s considered protective of human health and <br /> s, ¢ � <br /> the environment. <br /> *Words in bald are defined in the glossary <br /> 3 <br />