Injection ConfiningZone Lithology and Chemistry

The injection well is in the same area as the Monsanto well, so the geology and native water chemistry are very similar to that described before. Figure 20.13 shows the stratigraphy of the immediate area

FIGURE 20.13 American Cyanamid Injection Facility hydrogeologic cross-section. (From U.S. EPA, Assessing the Geochemical Fate of Deep-Well-Injected Hazardous Waste: A Reference Guide, EPA/625/ 6-89/025a, U.S. EPA, Cincinnati, OH, June 1990.)

and distances between the injection and monitoring wells. The lower limestone of the Floridan aquifer is used as the injection zone (1230 to 1440 ft), and the confining Bucatunna clay is about 50 m (165 ft) thick. TDS levels range from 12,000 to 12,700 mg/L, with chloride ion concentrations of 6700 mg/L. The pH ranges from 7.3 to 7.6, and temperature from 30°C to 32°C. Caliper and flowmeter tests made in the injection wells suggest that the waste moves almost exclusively within the top 18 m (55 ft) of the lower limestone. The preinjection groundwater flow direction is south-southwest.

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