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).
Many barren lakes have been stock with brook trout, providing angling recreation where none was previously available. One of the most colorful of the chars, the brook trout is dark green above, with worm-like markings on the back and dorsal fin. Cream and red spots appear on the sides, with the red spots bordered with blue. The lower fins are reddish, the leading edges bordered with a white and black stripe.