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r <br /> n� <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 4D 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> q1W Analytical 819 Straker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> MPDS Services Client Project I0 Unocal #0187, 437 E Miner Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7020227-234 Reported Feb 14, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> i <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst K Nil] K Nill K Nill K Nill <br /> MS/MSD <br /> Batch# 7020231 7020231 7020231 7020231 <br /> Date Prepared 2/7/97 2/7/97 2/7/97 2/7/97 <br /> Date Analyzed 2/7/97 2/7/97 2/7/97 2/7/97 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20frg/L 20ug/L 20Mg/L 60yg/L <br /> Matrix Spike <br /> % Recovery 90 85 90 85 <br />• Matrix Spike <br /> Duplicate % <br /> Recovery 95 85 95 88 <br /> Relative % <br /> Difference 5 4 0 0 54 3 9 <br /> LCS Batch# 5LCS020797 5LCS020797 5LCS020797 5LCS020797 <br /> Date Prepared 2/7/97 2/7/97 2/7/97 2/7/97 <br /> Date Analyzed 2/7/97 2/7/97 2/7/97 2/7/97 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 95 85 95 87 <br /> Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s 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 /> 01griature,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 /> 7020227 MPD <4> <br /> .� <br />