The NFPA 70E Standard details multiple levels of Hazard Risk Categories (HRC) [see table 1.1], also called Levels. The greater the risk: the higher the HRC. Arc Rating is the factor that indicates which HRC is necessary, and can be measured in either ATPV or EBT.
The optimal pH range for brook trout appears to be 6.5-8.0,with a tolerance range of 4.0-9.5.Brook trout occur in waters with a wide range of alkalinity and specificconductance, although high alkalinity and high specific conductance usuallyincrease brook trout production (Cooper and Scherer 1967).
Their job is to determine which stream (Clinton River, Coles Creek, Gilkey Creek, and Au Sable River) is suited for planting small brook trout fish fry raised in Michiganâs fish hatcheries. Demonstrate how to use each of the data forms using the overhead transparencies. Assign student groups to evaluate all four streams, or assign one stream to each group, if time is limited. Students will: ï Review the brook troutâs water quality and habitat requirements and record in the Stream Assessment Data Table.