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Table ES-2a <br /> Background Screening Levels - WET Metals r9 <br /> NCS Stockton n <br /> F" <br /> 4R1 iNAL DATA ADJi1S] D DATA USINe. fAG TRANSFORM B r_K RU Ko <br /> DETECTION MEAN 5'r`D` MEAN STD MAXTMIIM SCREENING LEVEL` <br /> Lu <br /> ANALYTE FREQUENCY (ug/L) (*L) (nglL) (ugly) tuglL) (ug/I.) <br /> ALUMINUM - Jd 100% 1,09.7 729 m <br /> 1,214 1,291 2,350 5,097 <br /> ALUMINUM-2` 100% 3,317 3,805 3,566 5.645 17,600 20,5(10 <br /> ALUMINUM 3 ' 10096 3,940 n <br /> S-b23 b,757 10,415 17,700 38,000 u <br /> ANTIMONY' 20% ---� --- - 3 -- <br /> 2.56 l <br /> ARSENIC 84% 26.3 31.6 29.3 57.4 163 201 M <br /> BARIUM 98% 144 237 134 797 1,320 725 r <br /> UCRYLLIUM 0% _ _ <br /> CADMIUM 4%' <br /> _. <br /> - 2.6 2.4 <br /> CHROMIUM 33% <br /> COBALT 1 <br /> 876 --. _._ <br /> - 31.6 27,2 <br /> --- 12.8 4.86 <br /> COPPER 59% 33.3 66.1 31.7 61.8 356 217 <br /> IRON 10095 3,876 5,114 4,048 7,152 28,300 25,3()4 <br /> !,[iAU 6495 5.6 9.6 5.64 8.67 60,2 <br /> 31.7 <br /> MANGANr51: 96% 216 382 230 571 2,360 1,944 <br /> MERCURY 1070 -- _.. _-- _ 1.1 <br /> MOLYBDENUM 49,70 <br /> - - 52.4 46.8 <br /> NICKEL 43% --- _._ - . <br /> _ <br /> ELENIUM 89'0 - '-- 78.2 32.2 <br /> -- 49 7 3.75 <br /> SILVER 2% -- - _ l.b <br /> i.6 <br /> HALLIUM 19% --- -_. <br /> 6.3 5.3 <br /> VANADIUM 88% 47.4 42.6 50.3 57.7 195 <br /> ZINC 223 <br /> 86% 26.3 34.5 27 40.7 ]79 149 <br /> Notes: (a)Srarrfatd Deviation <br /> (b) Mean al"I Starxlatd Deviation calcutatnt using Iogstansformed data(base e) <br /> (c)Shaded rows indicate detec4ion frequenters < 50%.An appronimatiorn to the 97.76 <br /> percentile(equivalent so ,,can + 2 standard devlstiom for a normal distribution) <br /> scrves as the background screening level in these cases <br /> (d) Said data set <br /> (e)Silt and Mineral clay data set <br /> (f)Organic ctay dau set <br /> (g) 'vt:pplicabte duc to detection flcgtrexy < 3056 <br /> o. <br /> ug l L = Micrograms per Ner l <br />