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n"11'1')r:; v"J_i....1.{..:U Table 6. Lake/reservoir and snow sampling siles Site neme Duck Lake near Grant, Colorado Lower Cabin Creek Reservoir near Georgetown. Colorado Clear Lake near Georgetown, Colorado Green Lake near Georgetown, Colorado [L,lake sampling site; SN, snow sampling site; identification number is the latitude and longitude of the site with a two~digit sequence number at the end; see figure 6 for site location] SlIe number Ll L2 L3 LA u.S. Geological Survey Identification number 393454105432900 393937105423900 394011105425700 394032105421700 SNI SN2 393434105432600 393643105425200 Duck Lake snow site Clear Creek snow site Collected organisms and material were transferred from the collection jar of the sampler to wide-mouth, plastic sample jars. Samples collected from some stream reaches were composited, whereas the five cross-section samples from other reaches were processed separately. Samples were preserved with a 70-percent ethanol solution. Periphyton samples were collected concur- rently with the macroinvertebrate samples at the II sites according to methods in Porter and others (1993). A device called an SG-92, which is constructed from part of a syringe body. a toothbrush. and a rubber O-ring, was used to scrub the attached periphyton from a rock surface and allow that solution of water and algae to be collected in a hand pipette for transfer to a wide-mouth plastic jar. The device has an area 00.66 cm2. which is used in density calculations. Five rocks were collected at each of the five cross sections. and the SG-92 was used on a single spot on each rock at streamside. The cumulative sample area was then 91.5 cm2 for the composited periphyton sample. Formalin was added to each composite sample to equal 3-5 percent of the total sample volume for preservation. Bulk Atmospheric-Deposition Sampling Bulk atmospheric-deposition samples were collected at a total of 12 sites during 3 periods: July 3 to August 1, 1995, at 3 ofthe sites; August 9 to August 23, 1995, at 10 of the sites; and October 4 to October 25,1995. at 10 of the sites. Sampling sites are listed in table 8 and in figure 8. White polyethylene buckets (5-gal capacity) were placed 50 ft apart at different distances from the edge of the travel lane on the curbside. Four sites had collectors placed 15 ft from the edge of the travel lane on both sides ofthe road. Collectors were placed at 15, 100, and 500 ft from the road for three sites. Two additional reference sites had three collectors clustered at least 500 ft away from the road. A site next to Geneva Creek had collectors on only one side of the road because Geneva Creek was too close for proper placement of the collectors. The collectors were anchored at ground level with plastic ties to painted reinforcing bars pounded into the ground. A clear plexiglas, vertical baffle was placed in each collector to prevent wind from swirling the contents. The collectors were washed and kept covered by lids until the beginning of each collection period. At the end of each collection period, the collectors were tightly covered in the field and transported to the lab for processing. The bulk atmospheric-deposition collectors accumulated material deposited from the air above the collectors. This material could include precipita- tion, atmospheric particles, side-cast or windblown particles, loose particles bouncing downslope, raindrop-impact splash, throughfall from vegetation, vegetation debris, and insects. These data include only deposited material and might not relate to visible or fugitive dust. METHODS OF DATA COLLECTION AND ANALYSIS 15