I did not save all the addresses for the construction, trucking and even the Murphy Sand & Gravel. We have seen satellite views of the pit over the months and it is most interesting. You can see it just by putting "pearl river, LA" into google earth and looking just east/ north east from town- the aqua lakes formed by the dredging are easy to find. You can even see the dredges in the water- looking like a foot bridge.
I took the time to look up the HQ address: 504 Water Street in Madisonville, Louisiana.
But that is all I have time to help you with on this company. Good luck!