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Sequoia680 Chcsapeakc Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 361 9233 <br /> 404 N W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 Oleo <br /> DS Services Client Project ID Tosco ##5886 2701 W March Ln Stockton <br /> 401 Stanwell Dr Ste 300 Matrix Liquid <br /> Concord CA 94520 <br /> Attention Jarrel Crider OC Sample Group 7050197-210 Reported May 14 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE Diesel <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 EPA 8015 <br /> Analyst K Nill K Nill K Nill K NJI I Dalvand D Sharma <br /> MS/MSD <br /> Batch# 7050188 7050188 7050188 7050188 7050185 BLK050897 <br /> Date Prepared 5/6/97 5/6/97 5/6/97 5/6/97 5/7/97 5/8/97 <br /> Date Analyzed 5/6/97 5/6/97 5/6/97 5/6/97 5/7/97 519/97 <br /> Instrument I D # HP 2 HP-2 HP 2 HP 2 GC/MS 2 HP 3A <br /> Conc Spiked 20Ng/L 20pg/L 20pg/L 60pg/L 50 <br /> Yg/L 300 pg/L <br /> Matrix Spike <br /> % Recovery 90 115 105 108 86 80 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 105 100 100 88 B0 <br /> Relative % <br /> Difference 57 91 48 80 23 00 <br /> LCS Batch# 2LCS050697 2LCS050697 2LCS050697 2LCS050697 LCS050797 LCS050897 <br /> Date Prepared 5/6/97 5/6/97 5/6/97 5/6/97 5/7/97 5/8/97 <br /> Date Analyzed 5/6/97 5/6/97 5/6/97 5/6/97 5/7/97 5/9/97 <br /> Instrument I D # HP 2 HP 2 HP 2 HP 2 GC/MS-2 HP 3A <br /> LCS % <br /> Recovery 60 95 90 88 90 83 <br /> Recovery <br /> Control Limits 60 140 60 140 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 /> nature 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 /> 7050197 MPD <9> <br /> k�. <br />