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' C-SHADRIFS.6/WPADD.13 <br /> 05/24/90 <br /> ' 4. Five samples of soils immediately above the A-zone aquifer in <br /> the vicinity of well 407A; <br /> ' 5. Five samples of soils immediately below the A-zone aquifer in <br /> the vicinity of well 407A; and <br /> ' 6. Water and filtered suspended solids from five wells with <br /> elevated arsenic concentrations, including well 407A. <br /> ' To identify the solid phase arsenic-containing material, it may be ' <br /> necessary to concentrate the sample by fractionation. American Society <br /> ' for Testing and Materials (ASTM) Method D-422 is a particle-size <br /> distribution technique for soils which may be used to separate samples <br /> ' into size fractions for chemical analysis. Density fractionation of <br /> soils samples for arsenic analysis may also be carried out using heavy <br /> liquids. <br /> The samples will be analyzed chemically, and, when elevated <br /> concentrations are found, those samples will be analyzed using scanning <br /> electron microscopy and/or X-ray diffraction techniques to identify the <br /> arsenic-bearing compound. <br /> 13 <br /> 1 <br />