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Table A-2 <br /> Analytical Test Methods and Sample Holding Times <br /> Parameter Test Holding <br /> Matrixa Method Time Reference <br /> Volatile Halocarbons 601 14 days 1 <br /> Volatile Aromatics 602 14 days 1 <br /> Metals 200 Seriesb 6 months c 2 <br /> Hexavalent Chromium 7195 24 hours 2 <br /> Alkalinity 310.1 14 days 2 <br /> Chemical Oxygen 410.2 28 days 2 <br /> Demand <br /> Chloride 325.3 28 days 2 <br /> Hardness 130.2 6 months 2 <br /> Methylene Blue Activated 425.1 48 hours 2 <br /> Substances <br /> Nitrate-Nitrogen 352.1 14 days 2 <br /> Nitrogen-Ammonia 350.3 28 days 2 <br /> pj9\939\93901 11 c <br />