When an in-situ permeability rate is required for the design of a BMP, can the in-situ perc rate be utilized instead? The apparatus described in the in-situ perm test maintains a constant head. The procedure for the septic drain field perc test (that we would utilize instead) does not. Are the...
In the past I have always made my despersing agent using 40 g of sodium hexametaphosphate per liter of distilled water as stated in ASTM D422. I have recently started working for a company that uses Calgon as the dispesing agent.
I know that hexamataphosphate is the active ingredient in Calgon...
