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Table A-2 <br />Analytical Test Methods .; Sample Holding Times <br />Parameter Matrix' <br />Test Method <br />Holding Time <br />Volatile Organic <br />8260 <br />14 days <br />Compounds <br />Metals <br />6000 and 7000 <br />6 monthsb <br />Series <br />Hexavalent Chromium <br />7196 <br />24 hours <br />Alkalinity (carbonate, <br />310.1 <br />14 days <br />bicarbonate total) <br />Chemical Oxygen Demand <br />410.2 <br />28 days <br />Chloride <br />300. <br />28 days <br />Nitrate+nitrite as Nitrogen <br />353.2 <br />14 days <br />Sulfate <br />300 <br />28 days <br />Sulfide <br />376.1 <br />7 days <br />Total Dissolved Solids <br />160.1 <br />7 days <br />Total Organic Carbon <br />415.1 <br />28 days <br />Semi -volatile organic <br />327.0 <br />7 days to extraction <br />compounds <br />Organochlorine Pesticides, <br />8150 <br />7 days to extraction <br />PCBs <br />Chlorophenoxy Herbicides <br />8140 <br />7 days to extraction <br />Cyanide <br />9010 <br />14 days <br />Oil and Grease <br />413.2 <br />28 days <br />' Metals analyzed by ICP (USEPA Method 6010), with the exception of <br />arsenic (USEPA Method 7060), lead (USEPA <br />Method 7421), mercury (USEPA Method 7470), and selenium (USEPA <br />Method 7740). <br />b Holding time for all metals is 6 months, with the exception of mercury (28 days). <br />SAC\S:\W ES\S&AP ROC. DOC -95\w: l <br />11 <br />