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• ICAP and AA should be quantitative L 5 to 50%). The quantifies of the following trace constituents barium, <br />boron, vanadium, manganese, zinc, copper, chromium, lead, and moybdenum in the fly ash are high enough <br />that if leached they wukl exceed EPA drinking or irrigation water quality. However, the potential for a <br />leachate to occur is believed to be very slight (refer to Section 4.3.4.8). On the other hand, the <br />concentrations of silver, arsenic, selenium, and mercury are quite low and are not expected to be found in <br />significant quantities in any leachate if one should occur. <br />The chemical characterization of the bottom ash was handled similarly to that of the fiY ash. Concentrations <br />of inorganic elements found in the bottom ash are summarized in Table 4.3-5 according to the analytical <br />technpue used. Most of the trace elements' concentrations in the bottom ash were Blighty lower (20%-50°,6 <br />lower) than in the fly ash. In the unlikey event that a leachate should occur, the availability of these trace <br />consttuents for leaching from the bottom ash is expected to be significanly lower than that from the fiY ash, <br />primarty because of the physical nature of the bottom ash. Bollom ash has signficanly less surface area <br />per unit mass and is more glassy. <br />The constituent concentrations of Craig Station scrubber sludge are given in Table 4.3-8. In general, <br />scrubber sludge composition consists of about 98% calcium sulfate dihydrate (gypsum) and 2% inert material <br />and exhibits a neutral pH. <br />r1 <br />LJ <br />• <br />433 <br />Revision: ,n2-~6-7 <br />Approved: ~ f R 2 1999 <br />