The radioactive mixed waste account is created within the state treasury. All receipts received from facilities assessed service charges established under RCW
70A.300.460 must be deposited into the account. Moneys in the account may be spent only after appropriation. Expenditures from the account may only be used for carrying out the department's powers and duties under this chapter related to the regulation of facilities that treat, store, or dispose of mixed waste or mixed waste facilities that are undergoing closure.