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treasure valley road dust study: final report - ResearchGate

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Table A-11. Laboratory Silt Analysis of Winter 2001 West Park Dr. Sample<br />

Sample ID: RS574<br />

Composite Gross Weight Tape<br />

BOISL013 331.0 masking<br />

BOISL014 269.9 gray duct<br />

BOISL015 233.0 clear<br />

Total 833.9<br />

Sieving:<br />

pan sample diff % diff<br />

Tare 342.8<br />

20 min 396.8 54.0<br />

30 min 398.1 55.3 1.3 2.4<br />

40 min 398.6 55.8 0.5 0.9<br />

Mass Determination<br />

Screen Tare weight (g) Final Weight(g) Net weight(g)<br />

Lid 215.8 215.9 0.1<br />

1/4 inch 488.7 488.9 0.2<br />

4 mesh 444.0 444.6 0.6<br />

18 mesh 369.6 548.2 178.6<br />

30 mesh 444.4 607.1 162.7<br />

50 mesh 408.1 517.6 109.5<br />

100 mesh 383.6 427.8 44.2<br />

200 mesh 378.7 419.1 40.4<br />

Pan 342.8 398.6 55.8<br />

Total Stack 3479.4 4068.4 589.0<br />

Total Stack (with sample) 4068.5<br />

Total Stack (calc) 3475.7 4067.8 592.1<br />

.<br />

Silt Calculation<br />

Total stack 4068.4<br />

Tare stack 3479.4<br />

Total sample 589.0<br />

Total silt 55.8<br />

% Silt (

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