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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 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OGD8 Services Client Project ID Unocal#0187,437 E Miner Ave Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6110523-530 Reported Nov 26, 1996 <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 815 <br /> Analyst C Westwater C Westwater C Westwater C Westwater D Sharma <br /> MS/MSD <br /> Batch## 6110121 6110121 6110121 6110121 BLK111196 <br /> Date Prepared 11/15/96 11/15/96 11/15/96 11/15/96 11/11/96 <br /> Date Analyzed 11/15/96 11/15/96 11/15/96 11/15/96 11/12/96 <br /> Instrument I D # HP-5 HP 5 HP-5 HP-5 HP-3A <br /> Conic Spiked 20pg/L 20 ug/L 20 pg/L 60 ug/L 300 erg/L <br /> Matrix Spike <br /> % Recovery 100 100 100 98 80 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 95 95 97 80 <br /> Relative % <br /> Difference 0 0 51 51 17 0 0 <br /> LCS Batch# 5LCS111596 5LCS111596 5LCS111596 5LCS111596 LCS111196 <br /> Date Prepared 11/15/96 11/15/96 11/15/96 11/15/96 11/11/96 <br /> Date Analyzed 11/15/96 11/15/96 11/15/96 11/15/96 11/12/96 <br /> Instrument I D # HP-5 HP 5 HP-5 HP 5 HP-3A <br /> LCS % <br /> Recovery 85 95 100 100 73 <br /> Recovery <br /> Control Limits 60-140 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 /> Signature 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 /> 6110523 MPD <4> <br />