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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9Z33 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988-9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)911-9600 FAx(916)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792-0342 <br /> • <br /> Gettler Ryan/GeoStrategies Client Project ID Uroca! 5421, 140162 02 <br /> 6747 Sierra Court, Suite J <br /> Dublin, CA 9456$ <br /> Attention Clyde Galantine QC Sample Group 9804C43-01-03 Reported Apr 30, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015/8020 <br /> Analyst R GECKLER <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes STEX as TPFI <br /> QC Batch # GC042298BTEXEXB <br /> Sample No 98041319-1 <br /> Date Prepared 4121198 4121198 4121198 4/21/98 4/21/98 <br /> Date Analyzed 4121198 4121198 4121196 4121198 4121198 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Sample Conc , mg/Kg N D N D N D N D N D <br /> Conc Spiked, mg/Kg 020 020 020 060 1 2 <br /> Matrix Spike mg/Kg 0 19 0 18 0 19 0 57 1 2 <br /> % Recovery 95 90 95 95 100 <br /> Matrix <br /> Spike Duplicate, mg/Kg 020 019 <br /> 0 20 0 61 1 3 <br /> % Recovery 100 95 100 102 108 <br /> Relative % Difference 5 1 5 4 5 1 7 1 7 7 <br /> RPD Control Limits 0-25 0 25 0-25 0-25 0-25 <br /> LCS Batch# BLK042298 <br /> Date Prepared 4122/98 4122198 4122198 4122198 4122198 <br /> Date Analyzed 4/22198 4122198 4122198 4122/98 4122198 <br /> Instrument 1 D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc Spiked mg1K9 020 020 0 20 0 60 1 2 <br /> Recovery mg/Kg 0 21 021 0 21 064 1 4 <br /> LCS % Recovery 105 105 105 107 117 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 60140 <br /> LCS 70130 70130 70130 70130 70130 <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 fali within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Mike Gregory <br /> Project Manager <br />