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MATRIX ENVIRONMENTAL LABORATORIES <br /> ANALYSIS• BTEX SPIKE SUMMARY <br /> CLIENT: Western GEO <br /> CONTACT: G. Converse Date Sampled: 12/9/92 <br /> COC No• 3665 Date Received: 12/9/92 <br /> Project No: Regal 603 Date Extracted: N/A <br /> Sample ID: MS, MSD Date of Analysis: 12/11/92 <br /> Lab ID: 924301 Matrix: WATER <br /> CONC CONC PERCENT <br /> COMPOUND SPIKED MEASURED RECOVERY <br /> MS MSD MS MSD RPD <br /> BENZENE 20. 0 18 . 3 20. 4 92% 1.02% 11% <br /> TOLUENE 20. 0 18. 5 20. 6 93% 103% 11% <br /> ETHYL BENZENE 20. 0 18 . 6 20. 5 93% 103% 10% <br /> TOTAL XYLENES 60. 0 55. 6 61. 4 93% 102% 10% <br /> MS= MATRIX SPIKE <br /> MSD= MATRIX SPIKE DUPLICATE <br /> RPD= RELATIVE PERCENT DIFFERENCE <br /> CONC= CONCENTRATION <br /> 3017 KILGORE ROAD# 100 • RANCHO CORDOVA, CA 95742 PHONE (916) 635-3962 e FAX (916) 635-9331 <br />