cumulativeGallons on a PurgeInterval tracks pumping progress through the purge. As each PurgeInterval is recorded, cumulativeGallons shows how much water has been removed so far, allowing the technician to track progress toward the minimum volume requirement alongside parameter stabilization. The final PurgeInterval's cumulativeGallons should match or approach the PurgeLog's totalVolumeGallons, providing a consistency check on the data.
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Cumulative Gallons
`cumulativeGallons` on a PurgeInterval records the running total of water removed from the well at the moment this stabilization check was taken.