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Q Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 111W 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 /> T <br /> ettler Ryan/Geostra#egles Client Pro)ect ID Unocal 2859, Stockton <br /> 747 Sierra Court, Ste J <br /> ublin, CA 94568 <br /> ttention Deanna Harding QC Sample Group 9806C89/C90 Reported Jul 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 310 2 <br /> Analyst K CESAR <br /> ANALYTE ALKALINITY <br /> QC Batch # IN0619983102FIA <br /> Sample No 9806C90-10 <br /> Date Prepared 6119198 <br /> Date Analyzed 6119196 <br /> Instrument I D# FIA <br /> Sample Cone , mg/L 540 <br /> Cane Spiked, mg/L 100 <br /> Matrix Spike, mg/L 630 <br /> % Recovery 90 <br /> Matrix <br /> *Spike Duplicate, mglL 640 <br /> % Recovery 100 <br /> Relative % Difference 11 <br /> RPD Control Limits 0-20 <br /> LCS Batch# LCS061998 <br /> Date Prepared 6/19/98 <br /> Date Analyzed 6/19198 <br /> Instrument I D# FIA <br /> Cone Spiked, mg/L 34 <br /> LCS Recovery, mg/L 34 <br /> LCS % Recovery 100 <br /> Percent Recovery Control Limits <br /> MSIMSD 75125 <br /> LCS 80 120 <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 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 fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager <br /> 19$ <br />