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Sequoia 680 Chesapeake Drive Redwood Ctty,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 4D <br /> 4ll,r Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *PDS Services Client Project ID Unocal #6981, 4707 Pacific Ave , Stockton <br /> 2401 Stanwell Dr , Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrell 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 K Nill K Nil] K Nill K Nill <br /> MS/MSD <br /> Batch# 6050059 6050059 6050059 6050059 <br /> Date Prepared 5/6/96 5/6/96 1/6/96 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 20ug/L 20 pg/L 20 jug/L 60 jug/L <br /> Matrix Spike <br /> % Recovery 115 115 120 117 <br /> is Matrix Spike <br /> Duplicate % <br /> Recovery 115 115 120 117 <br /> Relative % <br /> Difference 00 00 00 0 0 <br /> LCS Batch# 2LCS050696 2LCS050696 2LCS050696 2LCS050696 <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 110 110 115 113 <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, #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 /> egnature 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 <5> <br />