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Table ES-1 <br /> Background Screening Levels - Total Metals <br /> NCS Stockton <br /> Page 1 of 2 <br /> m <br /> SolL UCI'ECTION DATA MEAN s Std a MAXIMUM BACKGROUND � <br /> ANALYTE, TYPE FREQUENCY DigmilIuriON' (tnglkg} SCREENING LKVEL`(mg&g) D <br /> 3 <br /> ALUMINUM Snud 10096 normal 9,75Y 4,107 17,800 22,080 n <br /> Silt do Mineral Clay 100% normnl 20.609 5,764 41.600 37,901 m <br /> (n <br /> Organic Clay 100% normal 30,450 7,709 35,400 53,578 77, <br /> 1 <br /> ANTIMONY All S+)il Types 45% none -•- --- 1.00 0.942 M <br /> d <br /> ARSENIC Sand 100% lognormal 4.80 3.15 15.7 14.2 <br /> Silt do Mineral Clay 100% lognormal 10.5 8.19 47.8 35.1 <br /> Organic Clay 100% nornial 14.0 8.27 30.9 38.8 <br /> BARIUM Sand 1001y. norn►aI 111 52.4 244 268 <br /> Silt& Mineral Clay 100% normal 212 61-6 362 39"1 <br /> Organic Clay 100% normal 257 72.7 398 475 <br /> BLRYL.LIUM Sand 4376 --- --- C,49 0.487 <br /> Silt& Mineral Clay 97% normal 0.745 0.247 1.40 1.49 <br /> Organic Clay 1 W% lognormal 0.992 0.158 1 1.20 1.46 <br /> CADMIUM All Soil Types 596 d -•- 1.50 <br /> (� 0.667 <br /> CHROMIUM Sand 10096 normal 22.1 9.80 39.5 51.5 <br /> Silt& Mineral Clay 100% junmal 40.0 12.3 63.3 76.9 <br /> Organic Clay 10071. wtnial 63.6 14.6 E8.2 107 <br /> CII120MiUM, VI All Soil T Its 0% --- <br /> COHAL'T Santi 1()U% normal 7.68 3.15 13.8 17.1 <br /> Silt& Mineral Clay 1009'° normal 12.7 2.27 16 3 19.5 <br /> Organic Clay 100% lognormal 15.3 4.05 28,4 77.4 <br /> COPPI-R Sand 100% togrrormai 13.2 9.90 73.8 42.9 <br /> t Silt& Mineral Clay 100% normal 33.8 20.9 138 96,5 <br /> Organic-Clay IM% normal 49.7 11.5 (4.4 84.1 <br /> IRON Sand 100% normal 17,351 5,780 26,200 34,691 <br /> Silt& Mineral Clay 100% normal 27,866 4,808 37,100 42,290 <br /> organic Clay 100% normal 30.667 6,151 39,200 49,119 <br /> 1 <br /> rs <br />