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Sequoia 610 Chesapeake Untie Redwood City,CA 9406! (413) 364.9600 FAX(415) l64-923! <br /> Analytical 111,1 Avenue,Suite L Concord,CA 9452o (510) 616.9600 FAX(Sio)w.96i9 <br /> 119 Striker Avenue,Suite 1 Saeramerrlo,G 95*14 (916) 921.9600 FAX(916)931.0100 <br /> Alton Geoscience Client Project ID: Mobil 04,343/30-0136-15 <br /> 30-A Lindbergh Ave. Matrix: Liquid <br /> Livermore, CA 94550 <br /> Attention: Kevin Keenan QC Sample Group: 4050255-66 <br /> A...:......... . . . .: .:.., .���•*::.�����.>:<r.. . ,r,. :: : ,\.,.,. .,• Reported: May 11, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> EPA <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod. <br /> Analyst: J.Fontechs J.Fontecha J.Fontecha J.Fontecha K.Wimer <br /> MS/MSD <br /> Batch#: 4041417 4041417 4041417 4041417 BLK050994 <br /> Date Prepared: 5/10/94 5/10/94 5/10/94 5/10/94 5/9/94 <br /> Date Analyzed: 5/10/94 5/10/94 5/10/94 5/10/94 5/10/94 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 HP-M <br /> Conc. Spiked: 20ug/L 20pg/L 20ug/L song/L 300 ug/L <br /> Matrix Spike <br /> %Recovery: 8o 95 100 102 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 75 90 95 98 91 <br /> Relative% <br /> Difference: 6.5 5.4 5.1 4.0 3.7 <br /> n..r...us.5.\.:...:nr.;S yi:::i.:myriiii•.iv:.l\4:i fti.J;:-:lc::riS-::::.:.:::y <br /> LCS Batch#: 1LCS051094 1LCS051094 1LCS051094 il-Mos1094 Buwso%4 <br /> Date Prepared: 5/10/94 5/10/94 5/10/94 5/10/94 5/9/94 <br /> Date Analyzed: 5/10/94 5/10/94 5/10/94 5/10/94 5/10/94 <br /> Instrument I,D.#: HP-2 HP-2 HP-2 HP-2 HP-3A <br /> LCS% <br /> Recovery: 98 101 100 105 88 <br /> Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 28-122 <br /> ease <br /> The LCS Is a control sample of known.Interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA YTICAL, #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, i <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> _-. <br /> ren L Enstrom interference the LCS recave Is to be used to validate the batch. <br /> Project Manager <br /> 405025MT ssa <br />