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• / \ Sequoia 680 Chesapeake Drive Redwood City,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 /> WOAnalytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 4RPDS Services Client Project ID Unocal #2859, 1665 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider OC Sample Group 7020891-899 Reported Mar 4, 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 Ndl K NII K Ndl K Noll <br /> MS/MSD <br /> Batch# 7020797 7020797 7020797 7020797 <br /> i <br /> Date Prepared 2/20/97 2/20/97 2/20/97 2/20/97 <br /> Date Analyzed 2/20/97 2/20/97 2/20/97 2/20/97 <br /> Instrument 1 D # HP 4 HP-4 HP 4 HP 4 <br /> Conc Spiked 20Ng/L 20ug/L 20,ug/L 60frg/L <br /> Matrix Spike <br /> % Recovery 85 85 so 85 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 90 85 85 <br /> Relative% <br /> Difference 0 0 57 61 00 <br /> LCS Batch# 4LCS022097 4LCS022097 4LCS022097 4LCS022097 <br /> Date Prepared 2/20/97 2/20/97 2/20/97 2/20/97 <br /> Date Analyzed 2/20/97 2/20/97 2/20/97 2/20/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 90 95 95 95 <br /> Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 <br /> Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> E�UOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spoke is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> ognature on File the recovery of analytes from the matrix spoke 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 /> 7020891 MPD <I 1> <br />