Section 50.48 - Plan Updates(1) Toxics users shall complete plan updates every two years beginning with the date on which the initial plan is due pursuant to 310 CMR 50.41(1) by July 1st of the applicable year.(2) Plan updates shall include an explanation as to why the toxics user failed to implement a technology, procedure, or training program identified pursuant to 310 CMR 50.46(4) or failed to meet the schedule developed pursuant to 310 CMR 50.46(4)(d) or 310 CMR 50.46(5)(b).