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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> X1,7 Analytical <br /> �Gettler-Ryan Client Project rolect ID UNOCAL#5421-Stockton <br /> 6747 Sierra Court, Suite J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine QC Sample Group 8041415-417 Reported Apr 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Anallyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC 13atch# SP042298 SP042298 SP042298 SP042298 SP042298 <br /> 8020EXB 8020EXB 8020EX13 8020EXB 8020EXB <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 8041179 8041179 8041179 8041179 8041179 <br /> Sample Cone ND ND N D ND N D <br /> Prepared Date 4/22/98 4/22/98 4/22/98 4/22/98 4/22/98 <br /> Analyzed Date 4/22/98 4/22/98 4/22/98 4/22/98 4/22/98 <br /> Instrument I D # HP 2 HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 6 8 mg/Kg <br /> Result 07 069 069 21 12 <br /> MS % Recovery 88 86 86 88 176 <br /> Dup Result 077 077 075 22 14 <br /> MSD % Recov 96 96 94 92 206 <br /> RPD 95 110 83 47 154 <br /> RPD Limit 0-20 0-20 020 0-20 0-50 <br /> LCS # 2LCSO42298 2LCSO42298 2LCSO42298 2LCSO42298 2LCSO42298 <br /> Prepared Date 4/22/98 4/22/98 4/22/98 4/22/98 4/22/98 <br /> Analyzed Date 4/22/98 4/22/98 4/22/98 4/22/98 4/22/98 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked 20 ug/L 20 ug/L 20pg/L 60 pg/L 6 8 mg/Kg <br /> LCS Result 21 20 21 62 360 <br /> LCS % Recov 105 100 105 103 106 <br /> LCS 50-150 50-150 50-150 50-150 60-140 <br /> Control Limits / <br /> Please Note <br /> The LCS is a control sample of known, interferent-free matrix that is analyzed using the <br /> S QUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an a <br /> fortified with known quantifies of specific compounds and subjected to the entire anp <br /> l the recovery of analytes from the matrix spike does not fall within specified contr- <br /> interference,the LCS recove Is to be used to validate the batch <br /> Ala a "*M6=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Laboratory Direct , <br />