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 Patsy, the tinge is probably overflow from the rainwater either spilling into the pond or if it was a heavy rain, then the rainwater would splash into the pond. The dirt will give it a slight color. Remember that ponds do go through cycles and they are not swimming pools.here are two inter-related factors to consider before deciding to use rain water for fish: pH values affect fish health considerably. The typical pH of rain water is about 5 â 6. However industrially produced sulphuric oxides and carbon monoxide in the atmosphere can reduce the rainâs pH to 4 or below.