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• 680 Chesapeake prlve Redwood Cuy CA 940153 (650)364-9600 FAX(650)364-9233' <br /> a u Q x� 404 hk WI[ t Lane Walnut Creek CA 94598 (925)988-9600 FAX(92S)98&9673 <br /> 1 619 Striker Avenue Suite 8 Sacramento CA 95834 (916)92L-%W FAX(916)921-0100 <br /> Analytical. <br /> J 1455 M�owelt Blvd North Ste D Petaluma CA§4454 (707)792-1865 FAX(707)792-0342 <br /> An 1,51 1 kufustr$Road San Carlos CA 94070-41 f 1 (650)232-9600 FAX(650)Z32-9612 <br /> £ _ C- v <br /> Gettler•Ryan-Dublin Client Project ID Tosco S$#6981, Stockton \c> . <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding GC Sample Group 9041854-868 Reported May 14, 1999 <br /> g <br /> QUALITY CON ©L DATA REPORT � <br /> f <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE i <br /> Benzene i <br /> Method EPA 8020 EPA 802()�_ EPA 8020 EPA 8020 EPA 8260 <br /> Analyst J Mrnkei J 6Nnkel J Minkel J Minke! N Nei-son <br /> MS/MSD <br /> Batch# 9041955 9041955 9041955 9041955 9041859 <br /> Date Prepared, 4/29/99 4/29/99 4/29/99 4/29/99 4/29/99 <br /> Date Analyzed 4/29/99 4/29/99 4/29/99 4/29/99 4/29/99 <br /> Instrument l D # HP 2 HP-2 HP 2 HP 2 GC/MS-2 <br /> Conc Spiked 20,wg/L 20Ng/L 20lig/L 60ug/L Soap/L <br /> Matrix Spike <br /> %Recovery 97 100 97 107 82 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 97 95 97 112 82 <br /> Relative % <br /> Difference 00 51 010 46 t]0 <br /> LCS Batch# 2LCSO42999 2LCSO42999 2LC6042999 2LCSO42999 LCSO42999 <br /> Date PteRared 4/29/99 4/29/" 4/29/99 4/29/99 <br /> Date Anetyz4a c 4/29/99 4/29/M ' ` 4/29/99 4/29/99 -4M/99 <br /> Instrument LD # HP-2 HP-2 HP-2 -HP-2 =fiW5-2 <br /> r <br /> I <br /> LCS % <br /> i Recovery` L y 95 w 90 95 100 <br /> ecov ryF <br /> Control Limits. M130 70-130 70.130 �130 - 70-130 <br /> - - i <br /> tPlease Note <br /> The LCS is'a control sample of known,interferent free matrig theAttIsfnIXzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #127# preparation,and analytical methods employed far"sampiee fha,r�trp's spike is an aliquot of sample <br /> f9rtlfled with known quantities of specific compoundsani$subJ046d tg t fa antlrl!analytical procedure If + <br /> the reCey4ry of analytes from the matrix spike does riot fa LWJthin Vedfled control limns due to matrix I <br /> interference the LCS recovery is to be used to valldate the tx tcFC�l <br /> l , <br /> alanne Begley <br /> Project Manager <br /> 9041854 GEC <20a <br /> t� <br /> u t� <br />