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' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *Pb$ Services Client Project ID Unocal #0123, 1034 Central Ave, Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider OC Sample Group 6030121-126 Reported Mar 19, 1996 <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 <br /> Analyst L Huang L Huang L Huang L Huang J Dinsay <br /> MS/MSD <br /> Batch# 6022003 6022003 6022003 6022003 BLK030596 <br /> Date Prepared 3/6/96 3/6/96 3/6/96 3/6/96 3/5/96 <br /> Date Analyzed 3/6/96 3/6/96 3/6/96 3/6/96 3/5/96 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 GCHP-3A <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60ug/L 300frg/L <br /> Matrix Spike 220 <br /> % Recovery 105 101 100 102 73 <br /> Matrix Spike <br /> Duplicate% 200 <br /> Recovery 95 92 95 97 67 <br /> Relative % <br /> Difference 10 10 51 50 95 <br /> LCS Batch# 3LCS030696 3LCS030696 3LCS030696 3LCS030696 LCS030596 <br /> Date Prepared 3/6/96 3/6/96 3/6/96 3/6/96 3/5/96 <br /> Date Analyzed 3/6/96 3/6/96 3/6/96 3/6/96 3/5/96 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 GCHP-3A <br /> LCS % 210 <br /> Recovery 95 90 95 95 70 <br /> %Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 50-150 <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 If <br /> Signature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 6030121 MPD <4> <br />