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).
Although they are a cold-water species, they can tolerate a large range of temperatures from 0 â 22Â°C, but prefer 13 - 18Â°C. Movement/Migration: Movements inshore and offshore are related to spawning behavior and water temperature. If the habitat becomes too warm (>22ÂºC), brook trout will migrate to seek refuge. Deep pools and tributaries are the most common sanctuaries.