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).
Brook trout are beautiful fish. Although the intensity of the color may vary, they often have vibrant golden specks on an olive/green to to dark brown background with subtle blue, red, and purple specks mixed in. There are less specks on the very top of the fish which is darker and on the bottom where it becomes a brilliant yellow-orange-red.