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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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX{916)921 0100 <br /> �jl� <br /> eettler-Ryan Client Project ID UNOCAL#5429 - Stockton <br /> 6747 Sierra Court, Suite J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine OC Sample Group 8041413-414 Reported Apr 22, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH MTBE <br /> Benzene <br /> QC Batch# SP042198 SP042198 SP042198 SP042198 SP042198 SP041498 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 8020EXA 8260EXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M EPA 8260 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb N Nelson <br /> MS/MSD # 8041276 8041276 8041276 8041276 8041276 8040873 <br /> Sample Conc ND ND N D N D N D ND <br /> Prepared Date 4/21/98 4/21/98 4/21/98 4/21/98 4/21/98 4/14/98 <br /> Analyzed Date 4/21/98 4/21/98 4/21/98 4/21/98 4/21/98 4/15/98 <br /> Instrument 1 D # HP-4 HP-4 HP-4 HP-4 HP-4 GC/MS-2 <br /> Conc Spiked 0 80 mg/Kg 0 80 mg/Kg 0 80 mg/Kg 2 4 mg/Kg 6 4 mg/Kg 1300 pg/Kg <br /> Result 059 0 65 063 20 99 1000 <br /> MS % Recovery 74 81 79 83 155 77 <br /> Dup Result o 61 067 066 21 99 1100 <br /> MSD % Recov 76 84 83 88 155 85 <br /> RPD 33 30 47 49 00 95 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 0-25 <br /> LCS # 4LCSO42198 4LCSO42198 4LCSO42198 4LCSO42198 4LCSO42198 LCS042198EXA <br /> Prepared Date 4/21/98 4/21/98 4/21/90 4/21/98 4/21/98 4/21/98 <br /> Analyzed Date 4/21/98 4/21/98 4/21/98 4/21/98 4/21/98 4/21/98 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 HP-4 GC/MS 2 <br /> Conc Spiked 0 40 mg/kg 0 40 mg/kg 0 40 mg/kg 1 2 mg/kg 6 4 mg/Kg 130011g/Kg <br /> LCS Result 034 038 038 12 66 1300 <br /> LCS % Recov 85 95 95 98 103 100 <br /> LCS 50-150 50-150 50-150 50-150 60-140 65-135 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> EQUOIA 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 /> 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 /> e **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference <br /> La orat Direct6 <br /> 8041413 GET <4> <br />