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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 months' 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 /> Ntr=-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 Mumapal and Industrial Wastewater.EPA-6W/4-82-057,July 1981 <br /> _Methods for Chemical Analysis of Water and Wastes,EPA-60OW91M,revised March 1983. <br /> 'Metals analyzed by ICP(EPA Method 200.7)with the exception of arsenic(EPA Method 206.1.),lead(EPA Method 239.2), <br /> mercury(EPA Method 245.1),and selenium(EPA Method 270w� <br /> °Holding time for all metals is 6 months with the exoeption of mercury(28 days). <br /> SAG'p�3M390040.6el-93 lfc:3 <br />