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• ICAP and AA should be quantitative f+ 5 to 50%). The quantities of the following trace constituents barium, <br />boron, vanadium, manganese, zinc, copper, chromium, lead, and molybdenum in the fty ash are high enough <br />that if leached they could 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 />r1 <br />LJ <br />• <br />The chemical characterization of the bottom ash was handled similarly to that of the fly ash. Concentrations <br />of inorganic elements found in the bottom ash are summarized in Table 4.3-5 according to the analytical <br />technique used. Most of the trace elements' concentrations in the bottom ash were slightly lower (20%-50% <br />lower) than in the fly ash. In the unlikely event that a leachate should occur, the availability of these trace <br />constituents for leaching from the bottom ash is expected to be significantly lower than that from the fly ash, <br />primarily because of the physical nature of the bottom ash. Bottom ash has significantly less surface area <br />per unit mass and is more glassy. <br />The constituent concentrations of Craig Station scrubber sludge are given in Table 4.3-6. In general, <br />scrubber sludge composition consists of about 96% calcium sulfate dihydrate (gypsum) and 2% inert material <br />and exhibits a neutral pH. <br />4-33 <br />Revision: M2 -a,4 <br />Approved: .Ef R 2 1999 <br />