Laserfiche WebLink
4 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 15) 404 N W,get Lane Walnut Creek, CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Iwo Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RPDS Services Client Project ID Unocal #6981, 4707 Pacific Ave, Stockton <br /> 2401 Stanwell Dr , Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6041975-983 Reported May 9, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst z T z T z T Z T <br /> MS/MSD <br /> Batch# MS050696 MS050696 MS050696 MS050696 <br /> Date Prepared 5/6/96 5/6/96 5/6/96 5/6/96 <br /> Date Analyzed 5/6/96 5/6/96 5/6/96 5/6/96 <br /> Instrument I D # HP-2 HP 2 HP-2 HP-2 <br /> Conc Spiked 10ltg/L 10,ug/L 10Ng/L 30pg/L <br /> Matrix Spike <br /> % Recovery 100 149 123 132 <br /> iMatrix Spike <br /> Duplicate% <br /> Recovery 113 140 118 125 <br /> Relative% <br /> Difference 12 62 41 5 4 <br /> LCS Batch# LCS050696 LCS050696 LCS050696 LCS050696 <br /> Date Prepared 5/6/96 5/6/96 5/6/96 5/6/96 <br /> Date Analyzed 5/6/96 5/6/96 5/6/96 5/6/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 102 110 117 121 <br /> Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 <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, #1$94 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 If <br /> gnature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp Interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 6041975 MPD ¢4> <br />