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For a network of 103 wells and a number of strata
<br />(logarithms of TFM total pumpage divided into
<br />equal subdivisions) greater than 10, the resulting
<br />mean and standard deviation indicates that, for
<br />any given year, there is a 95- percent probability
<br />that the difference in aggregated pumpage
<br />between the TFM and PCC approach would be
<br />between about -3.41 and 1.59 percent.
<br />The difference in aggregated pumpage would be
<br />expected to be smaller as the number of well sites
<br />becomes larger. Assuming the distribution of
<br />total TFM pumpage is the same for 1998 data set,
<br />there is a 95- percent probability that the differ-
<br />ence in aggregated pumpage between the TFM
<br />and the PCC approach, for any given year, for a
<br />network of 1,000 wells would be between -1.71
<br />and -0.11 percent. This assumes that the large
<br />differences in pumpage are confined to wells
<br />with smaller pumpage. It also is important to
<br />emphasize that only 1998 pumpage data were
<br />used for this analysis, so the effect of temporal
<br />variations of PCC's on total network pumpage is
<br />not known.
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<br />* U.S. GOVERNMENT PRINTING OFFICE: 1999 - 573 -627 / M7973 Region No. 8
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