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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N 1111get lane Walnut Creek,CA 94598 (92S)988-9600 FAX(925)988-9673 <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)79Z-1865 FAX(707)79Z-0342 <br /> • <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 2859, Stockton <br /> 6747 Sierra Court, Ste J <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9806C89/C90 Reported Jul 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 160 1 <br /> Analyst P SANDROCK <br /> ANALYTE Total Dissolved Solids <br /> QC Batch # IN062398160100A <br /> Sample No LCS062398 <br /> Date Prepared 6/23198 <br /> Date Analyzed 6124198 <br /> Sample Conc , mg/L N D <br /> Conc Spiked, mg/L 500 <br /> LCS Spike, mg/L 470 <br /> % Recovery 94 <br /> . Matrix <br /> LCS Duplicate, mg/L 490 <br /> % Recovery 98 <br /> Relative % Difference 42 <br /> RPD Control Limits 0-20 <br /> LCS Batch# LCS062398 <br /> Date Prepared 6123198 <br /> Data Analyzed 6124/98 <br /> Conc Spiked mg/L 500 <br /> LCS Recovery, mg/L 470 <br /> LCS % Recovery 94 <br /> Percent Recovery Control Limits <br /> MS/MSD 75125 <br /> E� LCS 80 120 <br /> I <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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 preparation and analytical methods employed for the samples The matrix spike 4a 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 /> Tad Granicher <br /> Project Manager <br />