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Table 4 Geosyntec Consultants <br /> Field and Laboratory Quality Assurance/Quality Control Sample Analysis Summary <br /> Port of Stockton <br /> Stockton, California <br /> Laboratory Matrix <br /> Analysis Analytical Field Initial Ongoing Performance Control Matrix Matrix Spike Method Surrogate <br /> Type Method Duplicate Trip Blank Calibration Calibration Check Sample Duplicates Spikes Duplicates Blank Spikes <br /> 1 per 20 1 per 20 1 per 20 1 per 20 1 per 20 Every <br /> VOCs 8260B samples 1 per shipment As needed Every 12 hours Every 12 hours samples N�' samples samples samples sample <br /> TPH as 8260E As needed Ever12 hours Ever12 hours N�'1 per 20 1 per 20 1 per 20 1 per 20 1 per 20 Every <br /> gasoline samples -- y y samples samples samples samples sample <br /> TPH as 8015B As needed Ever12 hours -- N 1 per 20 1 per 20 1 per 20 1 per 20 1 per 20 Every <br /> Diesel samples -- y samples samples samples samples sample <br /> Notes: <br /> NA:not applicable <br /> TPH:total petroleum hydrocarbons <br /> VOC:volatile organic compound <br /> Page 1 of 1 January 2019 <br />