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j Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 M3 <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 /> DS Services Client Project ID Unocal #6981, 4707 Pacific Ave Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7011160-171 Reported Feb 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 Nill K NiH K Nill K Nill <br /> MS/MSD <br /> Batch# 7011160 7011160 7011160 7011160 <br /> Date Prepared 1/28/97 1/28/97 1/28/97 1/28/97 <br /> Date Analyzed 1/28/97 1/28/97 1/28/97 1/28/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20 Ng/L 20 pg/L 20 jig/L 60 pg/L <br /> Matrix Spike <br /> % Recovery 75 80 85 83 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 75 85 85 85 <br /> Relative % <br /> Difference 00 51 00 2 0 <br /> LCS Batch# 4LCS012897 4LCS012897 4LCS012897 4LCS012897 <br /> Date Prepared 1/28/97 1/28/97 1/28/97 1/28/97 <br /> Date Analyzed 1/28/97 1/28/97 1/28/97 1/28/97 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 75 85 85 88 <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 /> r fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> ature 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 /> 7011160 MPD <5> <br />