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I ) <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> -� - -- - --- -- ----404 N Wiget Lane - - - Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673--- - - <br /> 819 Striker Avenue Suite 8 _Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 Mcu trial Road <br /> North Ste D Petaluma CA 94954 {707)792-1865 FAX(707)792-0342 <br /> 1551. Industrial Road San Carlos CA 94070-4111 1650)232-9600 FAX(650)232-9612 <br /> Gettler-Ryan-Dublin Client Project ID Unocal 88#5886, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample-Group�9060540=560_— _ _ _ _Reported —Jun i7, 1999 _ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Diesel MTBE MTBE MTBE <br /> Method EPA 8015M EPA 8260 EPA 8260 EPA 8260 <br /> ' <br /> Analyst K Grubb San Carlos San Carlos San Carlos <br /> MS/MSD :r <br /> Batch# BLK060799B L906200 01 L906220-14 L906220 04 <br /> Date Prepared 6/7/99 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 ug/L 50yg/L 50 Ng/L 50 ug/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 8 5 83 <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, #1271 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 if . <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix r� <br /> interference,the LCS recovery is to be used to validate the batch <br /> ulianne Fe ley <br /> rolect Manager <br /> 9060540 GET <33> <br />