Epa 402-R-98-008 - Statistical Procedures For Certifying Phosphogypsum For Entry Into Commerce - U.s. Environmental Protection Agency - 1998 Page 17
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17decision rule reconsidered. In practice the cost of continuing to take samples and revisiting the
decision rule may become prohibitive and the attempt to certify this area of the stack for the
removal of phosphogypsum for agricultural purposes may be abandoned.
Clearly, the closer the true radium concentration is to 10 pCi/g, the greater the required
x
x
reduction in the interval between
and
*; therefore, the greater the required reduction in the
variance of the sample mean and the larger the size of the sample required. Again, the cost of
greatly increasing the sample size may become prohibitive, and the attempt to certify this area of
the stack for distribution to commerce under the provisions of Section 61.204 may be abandoned
An area of a phosphogypsum stack is rejected for distribution to commerce under the
provisions of Section 61.207(b)(3), described in Procedure 1, step (5)(b)) on p. 5, if the mean of
the sample is equal 10 pCi/g, with no provision for reconsideration using an increased sample
x
x
size. The reason is that the only way
* could be made equal 10 pCi/g if
is found to be
equal 10 pCi/g is that the sample size must be increased without limit. Since an infinitely large
x
sample is not possible, this area of the stack cannot be show to have an
* less then or equal 10
pCi/g.
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