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T — <br /> Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 986 9600 FAX(510)988 9673 <br /> ID l 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> � Analytica <br /> GLPDS Services Client Project ID Tosco #0123, 1034 Central Ave , Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7060358-361 Reported Jun 20, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb D Sharma <br /> MS/MSD <br /> Batch# 7060356 7060356 7060356 7060356 BLK061097 <br /> Date Prepared 6/13/97 6/13/97 6/13/97 6/13/97 6/10/97 <br /> Date Analyzed 6/13/97 6/13/97 6/13/97 6/13/97 6/18/97 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 HP-313 <br /> Cone Spiked 20 ug/L 20 yg/L 20 pg/L 60 ug/L 300 pg/L <br /> Matrix Spike <br /> % Recovery 95 95 105 100 130 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 90 90 100 95 117 <br /> Relative % <br /> Difference 54 54 4 9 51 11 <br /> LCS Batch# 5LCS061397 5LCS061397 5LCS061397 5LCS061397 LC3061097 <br /> Date Prepared 6/13/97 6/13/97 6/13/97 6/13/97 6/10/97 <br /> Date Analyzed 6/13/97 6/13/97 6/13/97 6/13/97 6/18/97 <br /> Instrument I D # HP 5 HP-5 HP-5 HP-5 HP-313 <br /> LCS % <br /> Recovery 95 95 100 98 110 <br /> Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 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 /> Osignature 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 /> 7060358 MPD <9> <br />