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� 4 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 1a) Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 A <br /> i <br /> Gettler Ryan/Geostrategies Client Project ID 180138 85/6981, 4707 Pacific <br /> ,6747 Sierra Court, Ste J Matrix Liquid <br /> 'Dublin.-CA 94568 - <br /> _ Attention Deanna Harding Work Order-#__ _981 OB87__01_12_ ---Reported -- Nov 41-1998 ----- <br /> 9810889 13 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC Batch# GC102298802005A GC102298802005A GC102298802005A GC102298802005A GC102298802005A <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. C Westwater C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD# 8101646 8101646 8101646 8101646 8101646 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 10/22/98 10/22/98 10/22/98 10/22/98 10/22/98 <br /> Analyzed Date. 10/22/98 10/22/98 10/22/98 10/22/98 10/22/98 <br /> Instrument I.D # HP5 HP5 HIPS HP5 HP5 <br /> Conc Spiked 20ug/L 20u9/L 20ug/L 60ug/L 290,ug/L <br /> Result 19 19 19 59 320 <br /> MS % Recovery 95 95 95 98 110 <br /> Dup Result 22 22 21 65 270 • <br /> MSD % Recov 110 110 105 108 93 <br /> RPD 146 146 10 97 169 <br /> RPD Limit. 0-20 0-20 0-20 0-20 0-50 <br /> LCS# LCS102298 LCS102298 LCS102298 LCS102298 LCS102298 <br /> Prepared Date* 10/22/98 10/22/98 10/22/98 10/22/98 10/22/98 <br /> Analyzed Date 10/22/98 10/22/98 10/22/98 10/22/98 10/22/98 <br /> Instrument 1.13# HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20ug/L 20ug/L 20pg/L 60u9/L 290ug/L <br /> LCS Result 23 23 23 70 330 <br /> LCS%Recov.. 115 115 115 117 114 <br /> LCS 70-130 70-130 70-130 70-130 60-140 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-tree matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> FLAP#1271 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 /> l Tod Granlctler <br /> Protect Manager "MS=Matrix Spike,MSO aVIS Duplicate,RPD=Relative%Difference 981OB87 GET a2> <br /> 1 <br />