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).
Hi joe, This fish can be easily bred in a tank measuring 24 (61 cm) with a capacity of 20 gallons (75 L). Water maintenance must be kept up in order for the fish to get in a spawning condition. The water should have a pH from 6.1-6.5, a water hardness of 4-8 dH, and a temperature from 79-82 F (26-28 C).