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).
Primary causes may be kidney stones, certain medications or infection. Generally, the normal pH range for urine is between 4.6 to 8.0, although it may vary depending on the laboratory testing your urine. If you exhibit a low pH level of less than 4.6, this may indicate diabetic ketoacidosis, diarrhea or starvation.