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. - . Sequoia 680 Chesapeake Drive Redwood City CA 94063 415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 510) 686 9600 FAX(510) 686 9689 <br /> Analytical <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 {916) 921 9600 FAX(916)921 0100 <br /> to <br /> o West, Inc Client Project ID Shell, 141 N El Dorado, Stockton, CA <br /> Melody Lane, Ste 160 Matrix Air <br /> Roseville, CA 95678 <br /> Attention Paul Graff CSC Sample Group 4070402-404 Reported Jul 18, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravailoti Chlaravanctl Chlaravallotl Chiarevailotl <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m° 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# BLK071294 BLK071294 BLK071294 BLK071294 <br /> Date Prepared 7/12 94 7/12/94 7/12/94 7/12/94 <br /> Date Analyzed. 7/12 94 7/12/94 7/12/94 7/12/94 <br /> Instrument l D # H°2 HP 2 HP-2 HP 2 <br /> LCS <br /> Recovery ^.5 100 100 100 <br /> Control Limits 76 125 75-125 75 125 75 125 <br /> MS/MSD <br /> Batch # BLK071294 BLK0712-4 BLK071294 SLK071294 <br /> Date Prepared 7/12 94 7/12/94 7/12/94 7/12/94 <br /> Date Analyzed 7/12 94 7/12/94 7/12/94 7/12/94 <br /> Instrument I D # HP 2 HP-2 QIP-2 HP 2 <br /> Matrix Spike <br /> % Recovery 5 100 100 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 105 105 102 <br /> Relative% <br /> Difference 0 0 49 49 20 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> preparation ano analytical methods empfayed for the samples The LCS%recovery data 1s used for <br /> validation of samele batch results Due to matrix effects the CC limits for MS/MSOs are advisory only <br /> Linda C Schneider and are not uses to accept or reject batch results <br /> Project Manager <br /> »070402 FUG <3> <br />