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s <br /> 680 Chesapeake Drive Redwood Cloy CA 94063 (650)364-9600 FAX(6501364-9733 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)98&9600 FAX(925}988-9673 <br /> 819 Striker Avenue Swte 8 Sacramento CA 95834 {916)921-9600 F"(916)921-0100 <br /> Blvd <br /> Petalurnat CA 94954 (707) <br /> Ci)- 1455 Analytical 1551 Indust"McDowell <br /> lRoad North Sri D San Carlos CA 94070-411 1 (650)232 79Z-1865 <br /> 6W FAX(650)732-9612 <br /> ac�f.�� 3\A '}..}NY � h }r n} '4+.v. •• M 'ri.Nr aY'�{w.klvJw.T4r*�{ <br /> Gettler-Ryan-Dublin W Client Project IDV Unocal SS#5886. Stockton M n <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding CC Sample Group 9060540-560 Reported Jun 17, 1999 ' <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Diesel MTBE MTBE MTBE <br /> Method EPA 8015M EPA 8260 EPA 8260 EPA 8260 <br /> Analyst K.Grubb San Carlos San Carlos San Carlos <br /> MS/MSD <br /> Batch# BLK060799B L906200-01 L906220-14 L90622M4 <br /> Date Prepared 617/99 6/14/99 6/14/99 6/14/99 <br /> Date Analyzed 6/9/99 6/14/99 6/15/99 6/15/99 <br /> Instrument I D# HP 3A - <br /> Conc Spiked 500 y9/L 50 pg/L 50 Ng/L 50 u9/L <br /> Matrix Spike <br /> %Recovery 62 125 90 138 <br /> . Matrix Spike <br /> Duplicate% <br /> Recovery 72 119 98 127 <br /> Relative% <br /> Difference 15 49 85 8 3 <br /> LCS Batch# LCS061499 LCS061499 LCS061499 <br /> Date Prepared 6/14/99 6/14/99 6/14/99 <br /> Date Analyzed 6/14/99 6/15/99 6/15/99 <br /> Instrument I D # - - - <br /> LCS % <br /> Recovery - 124 109 112 <br /> Recovery <br /> Control Limits 60-140 70-130 70-130 70-130 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL, #12711 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> „& San Carlos fortified with known quantities of specific compounds and subjected to the entire analytical procedure It <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> ullanne Fegley <br /> roject Manager <br /> 9060540 GET <33> <br />