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Table A-2 <br /> Analytical Test Methods and Sample Holding Times <br /> ' Parameter Matrix' Test Method Holding Time <br /> Volatile Organic 8260 14 days <br /> ' Compounds <br /> Metals 6000 and 7000 6 monthsb <br /> Series <br /> Hexavalent Chromium 7196 24 hours <br /> Alkalinity(carbonate, 310.1 14 days <br /> bicarbonate total) <br /> ' Chemical Oxygen Demand 410.2 28 days <br /> Chloride 300. 28 days <br /> Nitrate+nitrite as Nitrogen 353.2 14 days <br /> Sulfate 300 28 days <br /> Sulfide 376.1 7 days <br /> Total Dissolved Solids 160.1 7 days <br /> Total Organic Carbon 415.1 28 days <br /> Semi-volatile organic 327.0 7 days to extraction <br /> compounds <br /> Organochlorine Pesticides, 8150 7 days to extraction <br /> PCBs <br /> Chlorophenoxy Herbicides 8140 7 days to extraction <br /> Cyanide 9010 14 days <br /> ' Oil and Grease 413.2 28 days <br /> °Metals analyzed by ICP(USEPA Method 6010),with the exception of arsenic(USEPA M. ethod 7060),lead(USEPA <br /> Method 7421),mercury(USEPA Method 7470),and selenium(USEPA Method 7740} <br /> ' b Holding time for all metals is 6 months,with the exception of mercury(28 days). <br /> 1 <br /> 1 <br /> SAC\S:\WES\S&APR0C.D0C-95\w:i 11 <br />