Section 420.65 - Separation distance requirements for handling division 1.1 and 1.3 explosives(a)Quantity. For each explosive hazard facility, a launch site operator must determine the total quantity of division 1.1 and 1.3 explosives as follows:(1) A launch site operator must determine the maximum total quantity of division 1.1 and 1.3 explosives by class and division, in accordance with 49 CFR part 173, Subpart C, to be located in each explosive hazard facility where division 1.1 and 1.3 explosives will be handled.(2) When division 1.1 and 1.3 explosives are located in the same explosive hazard facility, the total quantity of explosive must be treated as division 1.1 for determining separation distances; or, a launch site operator may add the net explosive weight of the division 1.3 items to the net explosive weight of division 1.1 items to determine the total quantity of explosives.(b)Separation of division 1.1 and 1.3 explosives and determination of distances. A launch site operator must separate each explosive hazard facility where division 1.1 and 1.3 explosives are handled from all other explosive hazard facilities, all public traffic routes, and each public area, including the launch site boundary, by a distance no less than that provided for each quantity and explosive division in appendix E of this part as follows:(1) For division 1.1 explosives, the launch site operator must use tables E-1, E-2, and E-3 of appendix E of this part to determine the distance to each public area and public traffic route, and to determine each intraline distance.(2) For division 1.3 explosives, the launch site operator must use table E-4 of appendix E of this part to determine the distance to each public area and public traffic route, and to determine each intraline distance.(c)Separation distance by weight and table. A launch site operator must:(1) Employ no less than the public area distance, calculated under paragraph (b) of this section, to separate an explosive hazard facility from each public area, including the launch site boundary.(2) Employ no less than an intraline distance to separate an explosive hazard facility from all other explosive hazard facilities used by a single customer. For explosive hazard facilities used by different customers a launch site operator must use the greater public area distance to separate the facilities from each other.(3) Separate each public area containing any member of the public in the open by a distance equal to -1133.9 + [389 *ln(NEW)], where the NEW is greater than 450 pounds and less than 501,500 pounds.(d)NEW Quantities that Fall between Table Entries. A launch site operator must, when determining a separation distance for NEW quantities that fall between table entries, use the equation provided by tables E-1, E-3, or E-4 of appendix E of this part.(e)Calculating Maximum Permissible NEW Given a Distance. A launch site operator must, when determining a permissible quantity of explosives, calculate maximum permissible NEW using the equation of tables E-1, E-3, or E-4 of appendix E of this part.Doc. No. FAA-2011-0105, 77 FR 55114 , Sept. 7, 2012