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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> %07Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Oettler-Ryan Client Project ID UNOCAL #5421-Stockton <br /> 6747 Sierra Court, Suite d Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine QC Sample Group Reported Apr 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 11-Dichloroethene Trichloroethene Benzene Toluene Chloro- MTBE <br /> benzene <br /> QC Batch# SP042198 SP042198 SP042198 SP042198 SP042198 SP042198 <br /> 8260EXA 6260EXA 8260EXA 8260EXA 8260EXA 8260EXA <br /> Analy Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst N Nelson N Nelson N Nelson N Nelson N Nelson N Nelson <br /> MS/MSD # 8041277 8041277 8041277 8041277 8041277 8041277 <br /> Sample Cone N D N D N D N D NO N D <br /> Prepared Date 4/21/98 4/21/98 4/21/98 4/21/98 4/21/98 4/21/98 <br /> Analyzed Date 4/23/98 4/23/98 4/23/98 4/23/98 4/23/98 4/23/98 <br /> Instrument I D # GC/MS-2 GC/MS-2 GC/MS-2 GC/MS-2 GC/MS-2 GC/MS-2 <br /> Cone Spiked 2500 pg/kg 2500pg/k9 2500 pg/kg 25001rg/kg 2500 pg/kg 2500 pg/kg <br /> Result 1300 1300 1300 1300 1500 1400 <br /> MS % Recovery 100 100 100 100 115 108 <br /> Dup Result 1300 1300 1300 1300 1500 1400 <br /> MSD % Recov 100 100 100 100 115 108 <br /> RPD 00 00 00 00 00 00 <br /> RPD Limit 025 025 0-25 0-25 0-25 0-25 <br /> LCS # LCSO42498 LCSO42498 LCSO42498 LCSO42498 LCSO42498 LCSO42498 <br /> Prepared Date 4/24/98 4/24/98 4/24/98 4/24/98 4/24/98 4/24/98 <br /> Analyzed Date 4/24/98 4/24/98 4/24/98 4/24/98 4/24/98 4/24/98 <br /> Instrument I D # GC/MS-2 GC/MS-2 GC/MS-2 GC/MS 2 GC/MS-2 GC/MS-2 <br /> Cone Spiked 2500 ug/kg 2500 Ng/kg 2500 Ng/kg 2500 pg/kg 2500 pg/kg 2500ug/kg <br /> LCS Result 1100 1100 1100 1100 1300 1200 <br /> LCS % Recov 85 85 85 85 100 92 <br /> LCS 60-140 60-140 60-140 60-140 60-140 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 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 /> (�[ the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recover is to be used to validate the batch <br /> A Ke p **MS=Matrix Spike MSD=MS Duplicate, RPD=Relative% Difference <br /> 1_4Lab atol� Director <br /> 8041418 GET <11> <br />