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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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> APDS Services Client Project 1D Tosco #6981, 4707 Pacific Ave , Stockton <br /> 01 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7070934-944 Reported Jul 31, 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 Nill K Nill K Nill <br /> MS/MSD <br /> Batch# 7070888 7070888 7070888 7070888 <br /> Date Prepared 7/24/97 7/24/97 7/24/97 7/24/97 <br /> Date Analyzed 7/24/97 7/24/97 7/24/97 7/24/97 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> Conc Spiked 20ug/L 20ug/L 20pg/L 60mg/L <br /> Matrix Spike <br /> % Recovery 115 120 120 118 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 115 120 120 118 <br /> Relative % <br /> Difference 00 0 0 00 00 <br /> LCS Batch# 9LCS072497 9LCS072497 9LCS072497 9LCS072497 <br /> Date Prepared 7/24/97 7/24/97 7/24/97 7/24/97 <br /> Date Analyzed 7/24/97 7/24/97 7/24/97 7/24/97 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery 110 115 115 118 <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 /> Oture 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 /> 7070934 MPD <4> <br />