What is the trend of E. coli in the water?
E. coli concentrations are not changing in Bull Creek District Park based on all available non-storm to date. E. coli concentrations are increasing at the upstream Loop 360 site, and recent samples are the highest non-storm concentrations yet measured at that site. No regular monitoring by COA has occurred in the park since the end of the education campaign effect assessment in April 2008. 2. What is the trend of E. coli in the sediment? Why is sediment important? Bacteria in sediment at the park are greater than background levels from other Bull Creek sites. Bacteria in sediment at the park appear to be highly variable over time. Bacteria in sediment at Loop 360 upstream of the park are increasing over time and have been greater than park sediments in last 2 sample events. Sediment is important because it may act as a refuge for fecal bacteria in streams. Re-suspension of bacteria attached to sediments may re-introduce bacteria to the water column. Removal of sediment from the stream
