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Sequoia 0680 Chesapeake Drive Redwood City CA 9400(415) 364%00 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 /> PDS Services Client Project ID Unocal #5886, 2701 W March Ln, Stockton <br /> 2401 Stanwell Dr , Ste 300 Matrix <br /> Concord, CA 94520 <br /> Attention Jarrel Crider OC Sample Group 7090242-252 Reported Sep 17, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel MTBE <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 EPA 8260 <br /> Analyst- K NIII K NIII <br /> y K NIII K N111 A Kemp A Kemp <br /> MS/MSD <br /> Batch#' 7090245 7090245 7090245 7090245 B090997A 7090179 <br /> Date Prepared 9/11/97 9/11/97 9/11/97 9/11/97 9/9/97 9/4/97 <br /> Date Analyzed. 9/11/97 9/11/97 9/11/97 9/11/97 9/10/97 9/10/97 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 HP-3A GC/MS-2 <br /> Conc Spiked 20 pg/L 20 P91L 20 pg/L 60 09/L 500 ltg/L 50 pg/L <br /> Matrix Spike <br /> % Recovery 90 95 90 95 63 112 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery 90 90 90 93 85 114 <br /> Relative% <br /> Difference 00 5 4 0 0 18 32 00 <br /> LCS Batch#. 5LCS091197 5LCS091197 5LCS091197 5LC8091197 LC8090997 LCS091597 <br /> Date Prepared 9/11/97 9/11/97 9/11/97 9/11/97 9/9/97 9/15/97 <br /> Date Analyzed 9/11/97 9/11/97 9/11/97 9/11/97 9/10/97 9/15/97 <br /> Instrument I D # HP-5 HP-5 HP-5 HP 5 HP-3A GC/MS-2 <br /> LCS % <br /> Recovery 95 95 95 98 66 100 <br /> ° Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 60-140 65-135 <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 /> nature 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 /> 7090242 MPD <7> <br />