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treasure valley road dust study: final report - ResearchGate

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Table 2-3. Silt Content and Silt Loading from Winter Road Samples in Ada and Canyon Counties<br />

Location<br />

County Road Type<br />

Sample<br />

Date<br />

Area<br />

(m 2 )<br />

Sample<br />

Weight<br />

(g)<br />

Silt<br />

(g)<br />

Silt<br />

content<br />

(%)<br />

Silt<br />

Loading<br />

(g/m 2 )<br />

Front St. Between 3rd and<br />

5th<br />

Ada Arterial 3/4/2001 71.2 907 169 22 2.8<br />

Maple Grove North of<br />

Tillamook<br />

Ada Arterial 3/6/2001 92.7 554 151 36 2.1<br />

Garrity Blvd. Between<br />

Cavalry and 11th<br />

Canyon Arterial 3/7/2001 97.3 977 79 9.0 0.9<br />

Riva Ridge North of Reutzel<br />

Dr.<br />

Ada Collector 3/1/2001 37.2 2601 24 0.9 0.7<br />

13th St. North of Hays Ada Collector 3/4/2001 69.7 521 73 18 1.3<br />

Amity Between Colorado and<br />

Canyon<br />

Diamond<br />

Collector 3/7/2001 36.7 602 180 40 6.6<br />

Apple St. Between Wright<br />

and LaFayette<br />

Ada Local 3/3/2001 30.2 619 114 23 4.7<br />

West Park Dr. West of<br />

Milwaukee<br />

Ada Local 3/6/2001 49.5 709 56 9.5 1.4<br />

6th St. Between 6th Avenue<br />

and 7th Ave<br />

Canyon Local 3/7/2001 63.2 4342 181 8.6 5.9<br />

Howry Ada Unpaved 3/6/2001 4.2 3823 43 1.1<br />

Cloverdale Farm Road Ada Unpaved 3/17/2001 4.2 1595 33 2.1<br />

Pierce Park Ada Unpaved 3/16/2001 4.2 969 7.7 0.8<br />

Unpaved Driveway Off<br />

Happy Valley<br />

Canyon Unpaved 3/7/2001 4.2 1447 23 1.6<br />

De-icing<br />

Ada County Highway District Ada Material, TC 3/8/2001 N/A 2213 6.5 0.3<br />

Sand<br />

Table 2-4. Summary of Winter Silt Measurements by County<br />

Road Type<br />

County<br />

Average<br />

Silt %<br />

Standard<br />

Deviation<br />

Silt %<br />

Average<br />

Silt<br />

Loading<br />

(g/m 2 )<br />

Standard<br />

Deviation<br />

Silt<br />

Loading<br />

(g/m 2 )<br />

Arterial Ada 29 9.7 2.5 0.5<br />

Arterial Canyon 9.0 N/A 0.9 N/A<br />

Arterial Ada & Canyon 22 13 1.9 1.0<br />

Collector Ada 9.3 12 1.0 0.5<br />

Collector Canyon 40 N/A 6.6 N/A<br />

Collector Ada & Canyon 20 20 2.9 3.3<br />

Local Ada 16 9.4 3.0 2.4<br />

Local Canyon 8.6 N/A 5.9 N/A<br />

Local Ada & Canyon 14 8.0 4.0 2.3<br />

Unpaved Ada 1.3 0.7 N/A N/A<br />

Unpaved Canyon 1.6 N/A N/A N/A<br />

Unpaved Ada & Canyon 1.4 0.6<br />

2-6

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