Sample Notes 



At The Trees. Fine particulate organic matter and very fine sediment were extremely 

 abundant in this sample. The sample was anoxic and black but effectively cleared with H202 



Near the Mormon Church. Fine particulate organic matter was abundant, as well as 

 extremely heavy amounts of very fine to coarse inorganic sediment. The sample was anoxic and 

 black and had a strong H2S odor, but was cleared with H2O2 



Sewage Treatment Plant. Extremely heavy amounts of very fine sediment were 

 present. Macrophytes (slender, grass-like) were abundant. The sample smelled strongly of H2S, 

 but was effectively cleared with H2O2. 



Above Highway 200. Fine particulate organic matter and inorganic sediment (silt 

 through sand-sized) were abundant. The sample was anoxic and black due to H2S, but was 

 effectively cleared with H2O2. 



Near Van Norman. Fine particulate organic matter and moderately coarse sediment 

 were abundant. The sample anoxic and black due to H2S, but cleared with H2O2. 



Near Mouth. Extremely heavy amounts of fine to very fine sediment were present. The 

 sample was anoxic and black due to H2S, but cleared with H2O2. 



Non-Diatom Algae (Table 3) 



All six sites on Big Dry Creek except one — Highway 200 — supported the usual mix of 

 diatoms, green algae and cyanobacteria found in prairie streams. Cyanobacteria were absent 

 from the sample collected at the Highway 200 site (Table 3). 



