FIGURE A-1 Influent (secondary effluent) virus concentrations on BGM cells at Water Factory 21. The x-axis is a normal probability scale. NOTE: BGM = Buffalo Green Monkey; PFU = plaqueforming units. SOURCE: Reprinted, with permission, from James Montgomery Consulting Engineers, 1979. © 1979 by James Montgomery Consulting Engineers.

ratio of the effluent to influent concentration; however the conditional framework (as shown in Figure A-2) provides a more general approach Formally the probability distribution of the product concentrations may be evaluated as a multiple integral, which can (for the indicated process train) be written as (Stuart and Ord, 1987)



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