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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: 4192 Date Received: N/A <br /> Project 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 . 05 117 110% 6% <br /> TOLUENE 20. 23 .28 22 . 03 116% 110% 5% <br /> 10THYL BENZENE 20 . 22 .81 21. 60 114% 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 /> 3017 KILGORE ROAD k110 0 RANCHO CORDOVA CA 95742 PHONE {916) 635-3962 • FAX (916) 635-9331 <br />