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...
Why would you want to assume fill placed under unknown conditions is anything but unsatisfactory. It is simple enought to perform a series of borings (hand auger or with a drill rig), obtain Shelby tube samples from various depth(s), run a Proctor on the cuttings of the borings and calcuated 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...