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Table A-2 <br /> Analytical Test Methods and Sample Holding Times <br /> Parameter Matrix' Test Method Holding Time Reference <br /> Volatile Halocarbons 601 14 days 1 <br /> Volatile Aromatics 602 14 days 1 <br /> Metals 200 Series' 6 monthsb 2 <br /> Hexavalent Chromium 7195 24 hours 2 <br /> Alkalinity 310.1 14 days 2 <br /> Chemical Oxygen Demand 410.2 28 days 2 <br /> Chloride 325.3 28 days 2 <br /> Hardness 130.2 6 months 2 <br /> Nitrate-Nitrogen 352.1 14 days 2 <br /> Nitrogen-Ammonia 350.3 28 days 2 <br /> Sulfate 375.4 28 days 2 <br /> Sulfide 376.1 7 days 2 <br /> Total Dissolved Solids 160.1 7 days 2 <br /> Total Organic Carbon 415.1 28 days 2 <br /> Methods for Organic Chemical Analysis of Municipal and Industrial Wastewater,EPA-600/4-82-057,July 1982. <br /> :Methods for Chemical Analysis of Water and Wastes,EPA-600/4n9/020,revised March 1983. <br /> 'Metals analyzed by ICP(EPA Method 200.7)with the exception of arsenic(EPA Method 206.2),lead(EPA Method 239.2), <br /> mercury(EPA Method 245.1),and selenium(EPA Method 270.2). <br /> n Holding time for all metals is 6 months with the exception of mercury(28 days). <br /> SAC/pj(M939\09390040.8el-95 lfc:3 <br />