We have a customer with a silo half-filled with powder-activated carbon. We need to remove the remaining PAC in order to inspect and repair the bin bottom. This will cause us to remove the bin bottom from below the hopper. There is no access door or hatch to get to the remaining PAC. We are concerned about the volatility of the PAC and cutting into the silo with anything that may generate sparks or heat and the potential for a fire or explosion. Can we safely cut an opening in the side of the silo and install an inspection door that will allow us to both remove the remaining PAC and use the hatch for future inspections and repairs?