WATER RESOURCES OF ORANGE COUNTY 131
when the drainage well was operated again. It seemed almost certain that the drainage well was the source of contamination, but the Orange County Health Department decided to make a more exhaustive check.
Background data were collected for several months on the natural chloride (salt) content of five supply wells located from 100 to 1,000 feet from the drainage well (fig. 61). The background chloride content ranged from 9 to 12 ppm. On March 13, 1961, 500 pounds of common salt was put into the drainage well and water samples were taken at intervals from the supply wells. When the Northcrest supply well, 1,000 feet from the drainage
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EXPLANATION
* Drainage well
APOPKA 095 Supply well. Number
--- is depth of well, in feet, where known.
0 500 1000 1500 feet
Figure 61. Location of wells used in salt test in Lake Pleasant area.