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Sequoia 680 Cheupeake Drive Redwood City,CA 94060 (415) !64.9600 FAX(415)904.0711 <br /> 1900 Eater Avenue,Suite L Cogrord,CA 94330 (310) 616.9600 FAX(310)4814.9619 <br /> Analytical 119 Striker Avenue,Suite f Sen:renlenio,CA 938!4 (916) 921.9600 FAX(916)921.0100 <br /> Altars Geosclence Client Protect ID: Mobil 04443,Tracy <br /> 30-A Lindbergh Ave. Matrix: Liquid <br /> Livermore, CA 94550 <br /> Attention: Kevin Keenan OC Sample Group: 4100724735 Reported: Oct 21, 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: A.Tuzon A.Tuzon A.Tuzon A.Tuzon K.V.S. <br /> MS/MSD <br /> Batch#: 4100728 4100728 4100728 4100728 BLK101394 <br /> Date Prepared: 10/18/94 10/18/94 10/18/94 10/18/94 10/13/94 <br /> Date Analyzed: 10/18/94 10/18/94 10/18/94 10/18/94 10/14/94 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 HP-3A <br /> Conc. Spiked: 20frg/L 20pg/L 20Ng/L 60pg/L 300 pg/L <br /> Matrix Spike <br /> %Recovery: 110 110 105 105 81 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 120 120 120 113 68 <br /> Relative % <br /> Difference: 8.7 8,7 13 7.3 17 <br /> LCS Batch#: 3LCS101894 3LCS101894 3LCS101894 3LCS101894 BLK101394 <br /> Date Prepared: 10/18/94 10/18/94 10/18/94 10/18/94 10/13/94 <br /> Date Analyzed: 10/18/94 10/18/94 10/18/94 10/18/94 10/14/94 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 HP-3A <br /> LCS % <br /> Recovery: 74 118 124 123 81 <br /> Recovery <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. K <br /> 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 /> wren L. Enstrom <br /> Project Manager <br /> 4100724.ALT <5> <br /> h\ <br /> A <br />