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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 /> ID l 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 1W Analytica <br /> QPDS Services Client Project ICS Tosco #2859, 1665 Pacific Ave Stockton <br /> 2401 Stanwell Dr , Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 705080-588 Reported May 23, 1997 <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 Ni i <br /> MS/MSD <br /> Batch# 7050580 7050580 7050580 7050580 <br /> Date Prepared 5/13/97 5/13/97 5/13/97 5/13/97 <br /> Date Analyzed 5/13/97 5/13/97 5/13/97 5/13/97 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked 20pg/L 20,ug/L 20Ng/L 60ug/L <br /> Matrix Spike <br /> % Recovery 75 90 85 83 <br /> SMatrix Spike <br /> Duplicate% <br /> Recovery 90 105 100 100 <br /> Relative% <br /> Difference 18 15 16 18 <br /> LCS Batch# 2LCS051397 2LCS051397 2LCS051397 2LCS051397 <br /> Date Prepared 5/13/97 5/13/97 5/13/97 5/13/97 <br /> Date Analyzed 5/13/97 5/13/97 5/13/97 5/13/97 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 85 100 90 92 <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 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 /> 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 /> 7050580 MPD t4> <br />