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<br />TABLE 7 <br /> <br />Snow Samples Collected from Six Different <br />Streets in Stockholm; February 1969 <br />(Soderlund, Lehtinen and Finberg, 1970) <br /> <br /> Arithmetic Standard Reference ; <br />Analysis (mg/~) Mean Deviation Sample <br />Dry solids 3.600 1,900 43 <br />Volatile DS 500 480 37 <br />,Suspended solids 2,700 1,800 48 <br />Volatile SS 300 190 19 <br />Oil 40 35 1 <br />Lead 20 10 Traces <br />Cl 320 140 5 <br /> <br />days after the snowfall. The results from this sampling are <br /> <br />shown in Table 7. The reference sample, appearing in the third <br /> <br />column, was one of untouched snow from a park in the area. After <br /> <br />a cold period, the sampling of the melt-water from the area was <br /> <br />continued in March. The first spring rain, in April, and the <br /> <br />following rains were also collected. A strong correlation was <br /> <br />found between the pollutional load and the air temperature. This <br /> <br />was due to the increased melting of the polluted snow in a warmer <br /> <br />atmosphere and also a washing of the street with the melt-water. <br /> <br />From the figures presented in their report, the approximate <br /> <br />concentration ranges presented in Table 8 can be found from the <br /> <br />runoff in the tunnel of March 25-26th, 1969. <br /> <br />14 <br />