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• <br /> MATRIX ENVIRONMENTAL LABORATORIES <br /> ANALYSIS BTEX SPIKE SUMMARY <br /> CLIENT: Helmick & Lerner, Inc. <br /> CONTACT: D. Nakamoto Date Sampled: N/A <br /> COC No: 4292 Date Received: N/A <br /> Pro3ect No: Tracy F.D. No 2 HLI 10101 Date Extracted: N/A <br /> Sample ID: N/A Date of Analysis: 10/25/93 <br /> Lab ID: LCS/LCSD Matrix: WATER <br /> CONC CONC PERCENT <br /> COMPOUND SPIKED MEASURED RECOVERY <br /> ug/L LCS LCSD LCS LCSD RPD <br /> (ppb) <br /> BENZENE 20. 23 . 30 22 . 05 117% 11.0% 6% <br /> TOLUENE 20. 23 . 28 22 . 03 116% 110% 5% <br /> • ETHYL BENZENE 20. 22 .81 21. 60 11.4% 108% 5% <br /> TOTAL XYLENES 60. 67 .65 64 . 64 113% 108% 5% <br /> SURROGATE RECOVERY 113% 108% 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 />