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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415)364.9233 <br /> �•� 1900 Batts Avenue,Suite L Concord,CA 94520 (510) 686-9600 FAX(510)686.9689 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921.0100 <br /> b$+Ser�ices Client ro'ject It): Unocal #0788, 8203 E. 11th StTracy <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> r.Concord, CA 94520 <br /> Attention: Sarkis Karkarian QC Sample Group: 5020798-807 Reported: Mar 2, 1995';:` <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 Mod <br /> Analyst: A.Tuzon A.Tuzon A.Tuzon A.Tuzon K.Wimer <br /> MS/MSD <br /> Batch#: 5020900 5020900 5020900 5020900 BLK021795 <br /> Date Prepared: 2/22/95 2/22/95 2/22/95 2/22/95 2/17/95 <br /> Date Analyzed: 2/22/95 2/22/95 2/22/95 2/22/95 2/21/95 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3A <br /> Cone. Spiked: 20 pg/L 20 pg/L 20 pg/L 60 pg/L 300 pg/L <br /> Matrix Spike <br /> % Recovery: 85 90 90 93 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 85 90 90 93 104 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 0.0 2.3 <br /> LCS Batch#: 2LCS022295 2LCS022295 2LCS022295 2LCS022295 BLK021795 <br /> Date Prepared: 2/22/95 2/22/95 2/22/95 2/22/95 2/17/95 <br /> Date Analyzed: 2/22/95 2/22/95 2/22/95 2/22/95 2/21/95 <br /> Instrument IA.#: HP-4 HP-4 HP-4 HP-4 HP-3A <br /> LCS % <br /> Recovery: 85 90 90 91 101 <br /> % ecovery <br /> Control Limits: 71-133 72-128 72-130 71-120 28-122 <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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure. 11 <br /> ignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> 0 <br /> interference,the LCS recovea is to be used to validate the batch. <br /> Alan S. Kemp <br /> Project Manager <br /> 5020798.MPD <fi> <br />