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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 96W FAX(510) 988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> MPDS Services Client project ID Tosco#5886 2701 W March Lane,Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider CC Sample Group 71 201 63-1 73 Reported Dec 19, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xyienes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst K Ndl K Ntll K Nill K Ndl <br /> MS/MSD <br /> Batch# 7120160 7120160 7120160 7120160 <br /> Date Prepared 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Date Analyzed 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP 4 <br /> Conc Spiked 20pg/L 20ug/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 85 80 80 82 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 95 100 <br /> Relative % <br /> Difference 16 22 17 20 <br /> LCS Batch# 4LCS120897 4LCS120897 4LCS120897 4LCS120897 <br /> Date Prepared 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Date Analyzed 12/8/97 12/8/97 12/8/97 12/8/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP 4 <br /> LCS % <br /> Recovery- 75 75 85 87 <br /> ecovery <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 /> QU IA 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 /> 7120163 MPD <11> <br />