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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 <br />7199 <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 />9030B <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 />8270 <br />7 days to extraction <br />compounds <br />Organophosphorous <br />8141 <br />7 days to extraction <br />compounds <br />Chlorophenoxy Herbicides <br />8151A <br />7 days to extraction <br />Cyanide <br />9010B <br />14 days <br />Oil and Grease <br />413.2 <br />28 days <br />a Metals analyzed by ICP (USEPA Method 6010), with the exception of antimony <br />(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 />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 />