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Sequoia 610 Chesapeake Drive ReAwood City,CA 94061 (415) 364.9600 FAX(415) 164.9:1i <br /> Analytical 1900 Rates Meme,Suite L Concord,G 94520 (5 10) 6i6.%oo FAX(5 10)616.9619 <br /> 119 Striker Averwe,Suite i Sacramento,U 95134 (916) 921.9600 FAX(916)921-0100 <br /> Alton Geosclence Cllent project ID: Mob1l 04.343/30-0136-15 <br /> 30-A Lindbergh Ave. Matrix: Liquid <br /> Livermore, CA 94550 <br /> Attention: Kevin Keenan OC Sample Group: 4070910-921 Reported: Jul 27, 1994 <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: J.Fontecha J.Fontecha J.Fontecha J.Fontecha K.Wimer <br /> MS/MSD <br /> Batch#: 40706W 4070680 4070580 4070680 BLK072094 <br /> Date Prepared: 7/25/94 7/25/94 7/25/94 7/25/94 7/24/94 <br /> Date Analyzed: 7/25/94 7/25/94 7/25/94 7/25/94 7/24/94 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP4 HP313 <br /> Conc. Spiked: 20pg/L 20ug/L 20)x9/L sous/L 3Wug/L <br /> Matrix Spike <br /> % Recovery: 90 90 90 93 78 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 90 90 92 89 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 1.1 13 <br /> .}:.:�:i..�... .\... <br /> ::5::: <br /> LCS Batch#: 2LCS072594 2LCS072594 2LCS072594 2LCW72594 SLK072094 <br /> Date Prepared: 7/25/94 7/25/94 7/25/94 7/25/94 7/24/94 <br /> Date Analyzed: 7/25/94 7/25/94 7/25/94 7/25/94 7/24/94 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-38 <br /> LCS % <br /> Recovery: 90 93 95 97 78 <br /> Recovery <br /> Control Limits: 71-133 72.128 72.130 71-120 28-122 <br /> PleaseNote: <br /> The LCS is a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> SEQUOIA AN ICAL, #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. 0 <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LGS IVOOVeTy is to be used to validate the batch. <br /> ren L Enstrom <br /> Project Manager <br /> 407091o.ALT <5> <br /> 47� <br />