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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 404 N Vget Cane Walnut Creek,CA 94598 (510) 988 9600 FAX 510)988 9673 ,!DAnalytical 899 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 0b5 Services Client Project ID Tosco #0187, 437 E Miner Ave , Stockton 2401 Stanwell Dr, Ste 300 Matrix Liquid Concord, CA 94520 Attention Jarrell Crider QC Sample Group 7050162-169 Reported May 13, 1997 QUALITY CONTROL DATA REPORT ANALYTE Benzene Toluene Ethyl Xylenes Benzene Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Analyst K Nill K Nill K Nill K Nill MS/MSD Batch# 7050069 7050069 7050069 7050069 Date Prepared 5/5/97 5/5/97 5/5/97 5/5/97 Date Analyzed 5/5/97 5/5/97 5/5/97 5/5/97 Instrument I D # HP-4 HP-4 HP-4 HP-4 Conc Spiked 20yg/L 20ug/L 20pg/L 60pg/L Matrix Spike % Recovery 75 80 80 83 Matrix Spike Duplicate% Recovery 85 90 85 83 Relative% Difference 13 12 6 1 00 LCS Batch# 4LCS050597 4LCS050597 4LCS050597 4LCS050597 Date Prepared 5/5/97 5/5/97 5/5/97 5/5/97 Date Analyzed 5/5/97 5/5/97 5/5/97 5/5/97 Instrument I D # HP-4 HP-4 HP-4 HP-4 LCS % Recovery 80 85 80 85 % Recovery Control Limits 60 140 60-140 60-140 60-140 Please Note The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, i SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample fortified with known quantities of specific compounds and subjected to the entire analytical procedure If leature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix interference,the LGS recovery is to be used to validate the batch Alan B Kemp Project Manager 7050162 MPD X57