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680 Chesapeake Drive Redwood Gty CA 94063 (650)364-9600 FAX(650) 4-9233 <br /> Sequoia 404 N Wiget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 4x) <br /> 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 <br /> �Gettler Ryan/Geostrategies v Client Project ID v Former Unocal SS#0187 h <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9811635 01-10 Reported Nov 30, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# 8110248 8110248 8110248 8110248 8110248 <br /> Analy Method: EPA 8015M/8020M EPA 8015M/8020M EPA S015M/8020M EPA 8015M/8020M EPA8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst N A N A. N A- N a N A. <br /> MS/MSD # SLK111698 BLK111698 BLK111698 BLK111698 BLK111698 <br /> Sample Conc.: N D N D N D N D N D <br /> Prepared Date 11/16/98 11/16/98 11/16/98 11/16/98 11/16/98 <br /> Analyzed Date: 11/16/98 11/16/98 11/16/98 11/16/98 11/16/98 <br /> Instrument LD # NX N A. N A. N A. NA <br /> Conc. Spiked. 100tig/L 100pg/L 100pg/L 30oNg/L 1000 pg/L <br /> Result 914 91 921 281 <br /> MS % Recovery 914 91 921 937 <br /> Dup Result: 90 896 906 276 <br /> MSD % Recov 90 896 906 92 <br /> RPD- 154 155 164 183 <br /> RPD Limit: 0-25 0-25 0-25 0-25 <br /> LCS #' LCS111698 LCS111698 LCS 111698 LCS 111698 LCS111698 <br /> Prepared Date 11/16/98 11/16/98 11/16/98 11/16/98 11/16/98 <br /> Analyzed Date. 11/16/98 11/16/98 11/16/98 11/16/98 11/16/98 <br /> Instrument I.D.#' N A. N A. NA. N A. NA. <br /> Conc. Spiked 1001rg/L 100pg/L 100pg/L 300 jug/L 1000ug/L <br /> LCS Result 915 915 927 285 939 <br /> LCS % Recov.. 915 915 927 95 939 <br /> 62-119 80.117 66-125 73-119 53-146 <br /> LCS 84116 81-117 79-115 80-114 79.127 <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 /> GIEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> LAP #2245 fortified with known quantities of specific compounds and subjected to the entire analytical procedure N <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 /> Tod Granlcher <br /> Project Manager ""'MS-Matrix Spike,MSD-MS Duplicate,RPD-Relative%Difference 9811635 GEP 42> <br />