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Table ES-1 r <br /> Background Screening Leyels - Total Metals <br /> NCS Stockton F <br /> Page 2of2 a <br /> N <br /> SOIL UCTE I)EON DATA MEAN ° Std° MAXIMUM BACKGROU�fD <br /> ANALS"TF, TYPE FW:QUt NCY DN-TRFR(mON a (mg/kg) SCREENING LEVEU(mglkg) z <br /> LEAD Santl 100% normal 2.99 i.11 . 5.2 6.32 <br /> Silt&. ASineral Clay IW% normal 6.9 1.72 10.4 12.1 r <br /> 1 Z <br /> organic Clay 100% normal 11-5 2.84 IS 10 <br /> iNAP2GANIsSE Sand 10090 lognannal 335 215 739 979 rTI <br /> r <br /> 1 A 7 Silt&irfinerai Ciay IW76 lognormal 655 452 6,740 2,01 1 <br /> G Organic Clay IW% lognormal 606 228 1,129 1,289 <br /> 13 MERCURY All Soil Types 5% .-- --- 0.26_1 0.173 <br /> 11 MOLYBDCNUM All Soil 'iypes 2976 --- --- 7.1 4.98 <br /> NICKFI, Sand 100% normal 27.8 19.3 75.2 85.7 <br /> Silt& Mineral Clay 100% lug,normal 36.4 12.3 79.7 73.1 <br /> Organic Clay 100% normal 62 13.9 _ 83.3 1(}4 <br /> 4^ SFI.EN[I7M Alt Soil Types S% --. _ __ 2.5 1.18 <br /> SiL1'i.R Alt Soil Typcs 4070 --- 5.3 1.41 <br /> TI{AI,I_lUM All Soil Types 45% -- -- 1.8 1.67 <br /> VANADIUM Sand 100% normal 39.9 10.7 55.6 72 <br /> Ir� Silt& Mineral Clay 100% normal 60.7 11.3 94.4 101 <br /> Organic Clay 100% normal 103 29.7 148 192 <br /> ZINCSancf lUO�, nnrroai 37.4 12,8 58.3 75.8 <br /> Sill & Mincral Clay lW9s normal 71.4 . 11 3 101 105 <br /> Organic.Clay 100'x. normal 76.8 17.7 105 130 <br /> Nmes (a) The,lisdribution 11m be5d appruxlmatrs Uic dala <br /> (h) The wran It catculsied using lugtransrurmNd data(base c)for data diet Are distrilmcd lugnorrnal)y <br /> (c) Stradeil rows indicate detection frequencies c Sp%. An aiynoximatiun to the 97.7" <br /> (xrcentile(cgairalcm to wenn + 2 stands rd dariations for a normal lisiribution) <br /> 5eivcs as the hackgmumt screening Ierd in these cases <br /> (d) Nos;irplilable Clue to detection frequency < 50% <br /> mg f kg - Mitligtxnes per kilogram <br />