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d <br /> I / \ Sequoia haw Chesapeake Drive Redwood City, CA 9498 , (650) 364-9600 FAX (650) 364-9233 <br /> P{ <br /> 404 N. Wiget Lane Walnureek.k. CA 94598 (925) 986-9600 FAX (925) 988-9673 <br /> 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921 -9600 FAX (916) 921 -0100 <br /> Analytical 1455 McDowell Blvd. North, Ste. D Petaluma, CA 94954 (707) 792- 1865 FAX (707) 792-0342 <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650) 232-9600 FAX (650) 232-9612 <br /> Gettler-Ryan Dublin Client Project ID : Unocal SS#8671 , Stockton <br /> 6747 Sierra Court, Suite J Matrix: Liquid <br /> Dublin, CA 94568 <br /> Attention : Deanna Harding CC Sample Group: 9051317-321 Reported : Jun 4, 19W9 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> Method : EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst: J. Minkel J. Minkel J. Minkel J. Minkel N. Nelson <br /> MS/MSD <br /> Batch# : 9051308 9051308 9051308 9051308 9050941 <br /> Date Prepared : 5/21 /99 5/21 /99 5/21 /99 5/21 /99 5/21 /99 <br /> Date Analyzed : 5/21 /99 5/21 /99 5/21 /99 5/21 /99 5/22/99 <br /> Instrument 1- D .#: HP-5 HP-5 HP-5 HP-5 GC/MS-2 <br /> Conc- Spiked : 20 pg/L 20 pg/L 20 µg/L 60pg/L 50 pg/L <br /> Matrix Spike <br /> % Recovery: 85 90 90 93 106 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 85 90 90 93 120 <br /> Relative % <br /> Difference : 0.0 0.0 0.0 0.0 12 <br /> LCS Batch#: 5LCS052199 5LCS052199 BLCS052199 5LCS052199 LCSS052799 <br /> Date Prepared : 5/21 /99 5/21 /99 5/21 /99 5/21 /99 5/27/99 <br /> Date Analyzed : 5/21 /99 5/21 /99 5/21 /99 5/21 /99 5/27/99 <br /> Instrument LD .#: HP-5 HP-5 HP-5 HP-5 GC/MS-2 <br /> LCS % <br /> Recovery: 90 95 95 97 74 <br /> Recovery <br /> Control Limits: 70-130 70.130 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 /> ` I t / �G` fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br /> t4 <br /> k the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference, the LCS recoveryIs to be used to validate the batch. <br /> lanne Fegley <br /> Project Manager <br /> 9051317.GET a6 > <br /> .9LX <br />