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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 8260B or 601 Series 14 days <br /> Compounds <br /> Metals 6000 and 7000 6 months <br /> Series <br /> Hexavalent Chromium 7199 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 9030B 7 days <br /> Total Dissolved Solids 160.1 7 days <br /> Total Organic Carbon 415.1 28 days <br /> Semi-volatile organic 8270 7 days to extraction <br /> compounds <br /> Organophosphorous 8141 7 days to extraction <br /> compounds <br /> Chlorophenoxy Herbicides 8.151A 7 days to extraction <br /> Cyanide 9010B 14 days <br /> Oil and Grease 413.2 28 days <br /> Metals analyzed by ICP(USEPA Method 6010),with the exception of antimony(USEPA Method 7041),arsenic <br /> (USEPA Method 7062),cadmium(USEPA Method 7131A),lead(USEPA Method 7421),mercury(USEPA Method <br /> 7470A),nickel(USEPA Method 7521),selenium(USEPA Method 7742),and thallium(USEPA Method 7841). <br /> ' b Holding time for all metals is 6 months,with the exception of mercury(28 days). <br /> N:\Miscellaneous\Groundwater Info-All Sites\SAP_AppendixA.doc <br /> Groundwater Monitoring A-10 Department of Public Works/Solid Waste <br /> County of San Joaquin <br />