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680 Chesapeake Drive Redwood Cr CA 94063 <br /> Sequoia (650) 364 9600 FAX(650) 364 9233 <br /> 404 V Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 7ENGINEERING <br /> Ana�yt�eaX 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> 1455 McDowell 81vd North Ste D Petaluma CA 94954 (707) 79Z-1865 FAX(707) 792 0342 <br /> Client Project ID EXXON 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd Ste B100 f <br /> Lafayette, CA 94549 1 <br /> Attention Chrfsta Marting QC Sample Group 9808C98 Reported Sep 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 I <br /> Analyst N Castrop <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC083198BTEX02A <br /> Sample No 9808C97 10 f <br /> Date Prepared 8/31/98 8/31/98 8/31/98 8/31/98 <br /> Date Analyzed 8131198 8131198 8/31/98 8/31198 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Cone , ug/L N D N D N D N D <br /> Conc Spiked ug/L 10 10 10 30 <br /> iMatrix Spike, ug/L 11 11 11 31 <br /> % Recovery 107 106 105 102 <br /> WMatrix <br /> e Duplicate ug/L 10 10 99 30 <br /> % Recovery 100 100 99 100 <br /> Relative % Difference 68 5 8 5 9 2 0 <br /> RPD Control Limits 025 025 025 0-25 <br /> LCS Batch# GWLCS083198A <br /> Date Prepared 8/31/98 8/31/98 8/31/98 8/31/98 <br /> Date Analyzed 8/31/98 8/31/98 8/31/98 8131198 <br /> Instrument 1 0 # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery ug/L 9 8 9 8 9 g 29 <br /> LCS % Recovery 98 98 99 97 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70 130 70130 <br /> uahty Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> EQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> 04—� fortified with known quamitres of specific compounds and subjected to the entire analytical procedure If <br /> She recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> el Mei Shin interference the LCS recovery is to be used to validate the batch <br /> Iroject Manager <br /> { <br />