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<br />Table 10 <br /> <br />The Distribution of Lead in Snow and in Snow Melt <br />As A Function of Sampling Locations <br />(LaBarre, Milne and Oliver, 1973) <br /> <br />Location <br /> <br />Number of <br />samples <br /> <br />-1 <br />Mean lead level (ppm) Vg g <br /> <br />Filtrate <br /> <br />Sediment <br /> <br />Total sample <br /> <br />Range of lead <br />levels (ppm) <br />for total sample <br /> <br />Snow dumps <br /> <br />Industrial street <br /> <br />149 <br />3 <br />41 <br />6 <br /> <br />0.052 <br /> <br />555 <br /> <br />4.8 <br /> <br />0.02 50 <br /> <br />Major highway <br /> <br />0.060 <br /> <br />3287 <br /> <br />102 <br /> <br />86 113 <br /> <br />commercial street <br /> <br />0.042 <br /> <br />822 <br /> <br />3.7 <br /> <br />0.02 11. 3 <br /> <br />0.048 <br /> <br />935 <br /> <br />4.7 <br /> <br />0.06 14.3 <br />0.12 10.2 <br /> <br />'" <br />'" <br /> <br />Residential street <br /> <br />9 <br /> <br />0.014 <br /> <br />1228 <br /> <br />2.0 <br /> <br />Roof samples <br /> <br />5 <br />39 <br /> <br />0.041 <br /> <br />0.12 <br /> <br />0.02 0.25 <br /> <br />Snow dump run-off <br /> <br />0.009 <br /> <br />1322 <br /> <br />0.11 <br /> <br />0.004 0.51 <br /> <br />Storm sewer run-off <br /> <br />50 <br /> <br />0.007 <br /> <br />1791 <br />479 <br />448 <br /> <br />0.13 <br /> <br />0.002 1.19 <br /> <br />Raw sewage <br /> <br />5 <br /> <br />0.026 <br /> <br />Treated sewage <br /> <br />13 <br /> <br />0.027 <br /> <br />0.09 <br />0.06 <br /> <br />0.05 0.16 <br /> <br />0.003 0.14 <br /> <br />River <br /> <br />8 <br /> <br />0.006 <br /> <br />69* <br /> <br />0.03t <br /> <br />0.004 0.046 <br /> <br />* Value for river bed sediments (22 samples). <br /> <br />t Calculated using levels in transported sediment (av. 494 ppm) as opposed to river bed <br />sediments. <br /> <br />. <br /> <br />.. . <br />