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4 <br /> Sequoia680 Chesapeake Drive Redwood C,M 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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �,Ir <br /> 14POS Services Client Project ID Tosco #0187, 437 E Miner Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention .larrel Crider OC Sample Group 7050162-169 Reported May 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 6020 EPA 8020 EPA 8020 <br /> Analyst K Nill K Nill K Nill K Nill <br /> MS/MSD <br /> Batch# 7050096 7050096 7050096 7050096 <br /> Date Prepared 5/5/97 5/5/97 5/5/97 5/5/97 <br /> Date Analyzed 5/5/97 5/5/97 5/5/97 5/5/97 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> COnc Spiked 20Mg/L 20pg/L 20ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery 8o 95 90 92 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery 85 100 95 93 <br /> Relative % <br /> Difference 61 51 54 18 <br /> LCS Batch# 2LCS050597 2LCS050597 2LC8050597 2LCS050597 <br /> Date Prepared 5/5/97 5/5/97 5/5/97 5/5/97 <br /> Date Analyzed 5/5/97 5/5/97 5/5/97 5/5/97 <br /> Instrument I D # HP-2 HP-2 HP 2 HP 2 <br /> LCS % <br /> Recovery 85 105 95 98 <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 /> *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 /> 7050162 MPD <4> <br />