Permitted monitor wells
Figure 8-9 shows the distribution of WSEO and MBMG monitoring well permits in the WBRB and permits issued before and after 2000. Most monitoring wells are located near population centers and along rivers and other large surface drainages, because that is where facilities that require groundwater monitoring are concentrated. The depth vs. yield tables on Figure 8-9 show that while permits have been issued for all depth categories, by far the largest number were issued for depths of 0 to 50 feet and for yields of 0 to 25 gpm, for both total permits and permits since 2000, reflecting monitoring of the shallow water-table aquifers that are most susceptible to contamination. It is likely that most of these permits were issued for a yield of 0 gpm. One quarter of permits in the database for monitoring wells have been issued since 2000; and, as discussed above, this number is probably understated, per the 2004 WSEO policy change. Twenty percent of the monitoring-well permits are coded or have no recorded depth.
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