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File No. 20-3978-01.WR9 KLEINFELDER <br /> December 9, 1996 <br /> 2.2.2 Verification of Suspected But Not Geophysically Confirmed Areas <br /> Geophysical methods are not 100 percent effective and it is possible that buried waste may not be <br /> detected by either the EM or the magnetometer. To reduce this uncertainty (and decrease the risk <br /> of missing fill areas), the areas where geophysics did not indicate waste will be potholed using <br /> the backhoe. Between 5 and 10 potholes per suspected landfill area will be dug to a depth of <br /> approximately 12 feet. If no waste is encountered in any of these potholes, no further <br /> investigation will be made. If waste is encountered, the landfill area will be trenched as <br /> described in Section 2.3.1. <br /> 2.3 Soil Sampling <br /> Soil samples will be collected from beneath the waste at the same time as trenching. Three soil <br /> samples will be collected from each landfill approximately 1 foot below the waste/soil interface. <br /> These twenty-one (21) samples will be collected and submitted to a State approved laboratory for <br /> analysis. Each sample will be analyzed for the following constituents: <br /> Analytical <br /> Constituent Method <br /> Inorganics <br /> Sb, Ba, Be, Cd, Cr (total), Co, Cu, Ag, So, V, Zn,Ni, Mn, SW6010* <br /> Pb, Tl SW7000* <br /> Hg SW7471* <br /> As, Se SM3114B* <br /> Cyanide SW9010* <br /> Sulfide SW9030* <br /> Volatile Organics SW8260 <br /> Semivolatile Organics SW8270 <br /> Organophosphorous Pesticides SW8141 <br /> Chlorinated Herbicides SW8150 <br /> * =or equivalent <br /> This list of constituents is used by the state regulators (Regional Water Quality Control Board, <br /> and California Integrated Waste Management Board) to test for releases from municipal waste <br /> landfills. <br /> 20-3978-O1.WR91MP960143 Page 4 of 9 81996, Kleinfelder, Inc. <br />