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i <br /> 680 Chesapeake Drive 1 <br /> Sequoia P Redwood Crry CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> 404 N WigeT Lane Walnut Creek CA 94598 (9Z5)988 9,500 FAX(925)988 9673 <br /> Ana�yt1Ca� 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 Of00 <br /> 1455 McDowell Blvd North Sre D Petaluma,CA 94954 (707)79Z 1 865 FAX(707)792 0342 <br /> € <br /> f <br />�A ENGINEERING Client Project 1D EXXON 7-3942, 5153942 3300 <br /> 468 Mt Diablo Blvd Ste B100 <br /> afayette, CA 94549 <br /> �ttentlon Chrlsta Marting QC Sample Group 980SC98 Reported Sep 24, 1998 <br /> QUALITY CONTROL DATA REPORT i <br /> E <br /> Matrix Liquid 1 <br /> Method EPA 8020 <br /> Analyst M MCMI€Ian <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO82698BTEX21A 1 <br /> Sample No 9808821-07 <br /> Date Prepared 8/26/98 8/26198 8/26/98 8/26198 <br /> Date Analyzed 8/26/98 8/26/98 8126198 8126/98 I <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Sample Cone , ug/L N D N D N D N D t <br /> Cone Spiked ug/L 10 10 10 30 r <br /> Matrix Spike, ug/L 100 9 5 9 3 29 <br /> % Recovery 100 95 93 95 <br /> W <br /> atnxplicate ug/L 11 1010 31 { <br /> % Recovery 109 104 103 105 + <br /> lelative % Difference 8 6 9 0 10 10 <br /> RPD Control Limits 0-25 0-25 0 25 0 25 I <br /> LCS Batch# GWLCS082698A <br /> Date Prepared 8126/98 8/26/98 8126198 8126198 <br /> Date Analyzed 8/26/98 8/26198 8/26/98 8/26198 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 F <br /> Cone Spiked ug/L 10 10 10 30 <br /> SCS Recovery ug/L 9 9 9 4 94 29 <br /> LCS % Recovery 99 94 94 95 <br /> �rcent Recovery Control Limits <br /> MSIMSD 60140 60140 60 140 60140 <br /> LCS 7D 130 70 130 70 130 70 130 i <br /> My Assurance Statement All standard operating procedures and quality control requirements have been met <br /> F.terfefence <br /> Note <br /> LCS is a control sample of known interferent free matrix that is analyzed using the same reagents 7t` <br /> OIA ANALYTICAL tion and analytical methods empioyed for the samples The matrix spike is an aliquot of sample r <br /> • fortified with known quantities of specific compounds and subjected to the entire analytical procedure If [ <br /> very of analytes from the matrix spike does not fall within specif ed control limits due to matrix <br /> the LCS recoveryis to be used to validate the batch S <br /> ei Shin <br /> ct Manager i <br /> I <br /> 1 ' <br />