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The watershed-scale component comprised 26 sampling stations distributed over 214.6 stream kilometers in central-eastern Trinity County near Weaverville, Douglas City, and Junction City (Figure 1, Supplementary Material, Appendix B). Between one and nine sampling stations were established within eight Trinity River subwatersheds (Table 1). Sampling stations ranged in elevation from 487 to 1,129 m (median: 690 m; sd: 147.93 m), drainage area from 4.2 to 190.51 km2 (median: 56.53 km2; sd: 64.79 km2), and were established on public lands (Shasta-Trinity National Forest and Bureau of Land Management Public Domain Land) and private lands with the prior permission of landowners.

Table 1

Quantity of POCIS sampling stations within each Hydrologic Unit Code (HUC) 10 watershed and HUC12 subwatershed in Trinity County, California, USA. POCIS were placed to monitor selected pesticides

Watershed (HUC10)Subwatershed (HUC12)Sampling locations
Browns Creek Lower Browns Creek 8 
Upper Browns Creek 3 
Canyon Creek Lower Canyon Creek 2 
Upper Canyon Creek 1 
North Fork Trinity River Lower North Fork Trinity River 1 
Weaver Creek-Trinity River Deadwood Creek-Trinity River 2 
Rush Creek 2 
Weaver Creek 7 
  26 
Watershed (HUC10)Subwatershed (HUC12)Sampling locations
Browns Creek Lower Browns Creek 8 
Upper Browns Creek 3 
Canyon Creek Lower Canyon Creek 2 
Upper Canyon Creek 1 
North Fork Trinity River Lower North Fork Trinity River 1 
Weaver Creek-Trinity River Deadwood Creek-Trinity River 2 
Rush Creek 2 
Weaver Creek 7 
  26 

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