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MATRIX ENVIRONMENTAL LABORATORIES <br /> ANALYSIS BTEX SPIKE SUMMARY <br /> CLIENT: Helmick & Lerner, Inc. <br /> CONTACT: D. Nakamoto Date Sampled: N/A <br /> COC No: 4173 Date Received: N/A <br /> Project No: City of Tracy Fire Dept.2 Date Extracted: 10/13/93 <br /> Sample ID: N/A Date of Analysis: 10/13/93 <br /> Lab ID: LCS/LCSD Matrix: SOIL <br /> CONC CONC PERCENT <br /> COMPOUND SPIKED MEASURED RECOVERY <br /> mg/kg LCS LCSD LCS LCSD RPD <br /> (ppm) <br /> BENZENE 1. 0. 96 0.96 96% 96% 0% <br /> TOLUENE 1. 0.91 0.91 91% 91% 0% <br /> ETHYL BENZENE 1. 0. 86 0 . 85 86% 85% 1% <br /> TOTAL XYLENES 3 . 2 . 54 2 .52 85% 84% 1% <br /> SURROGATE RECOVERY 93% 93% ACCEPTABLE RANGE <br /> 70% TO 130% <br /> LCS= LABORATORY CONTROL SPIKE <br /> LCSD= LABORATORY CONTROL SPIKE DUPLICATE <br /> RPD= RELATIVE PERCENT DIFFERENCE <br /> CONC= CONCENTRATION <br /> i <br />