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•' I <br /> 1 Sequoia 680 Chesapeake lane Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9133 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9,573 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> z Enviros Client Project ID' Shell 4315 Waterloo, Stockton <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9602G37 -01 -04 Reported Mar 4, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes j <br /> Benzene <br /> QC Batch#. GCO22996BTEXEXA GCO22996STEXEXA GCO22996BTEXEXA GCO229966TEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst. E Cunanan E Cunanan E Cunanan E Cunanan <br /> MS/IVISD#- 9602E95-03 9602E95-03 9602E95-03 9602E95-03 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 2/29/96 2/29/96 2/29/96 2/29/96 <br /> Analyzed Date. 2/29/96 2/29/96 2/29/96 2/29/96 <br /> Instrument 1 D #• GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> Result. 020 020 020 060 <br /> MS %Recovery: 100 100 100 100 <br /> Dup Result 021 021 021 062 <br /> MSD % Recov 105 105 105 103 <br /> RPD. 49 49 49 33 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS #: GBLK022996BS-A GBLK022996BS-A ELK022996BS-A GBLK0229968S-A <br /> Prepared Date. 2/29/96 2/29/96 2/29/96 2/29/96 <br /> Analyzed Date 2/29/96 2/29/96 2/29/96 2/29/96 <br /> Instrument I.D.#: GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc. Spiked- 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Result. 020 021 021 061 <br /> LCS % Recov - 100 105 105 102 <br /> LCS 50-150 50-150 50-150 50-150 <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 /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of saMPle <br /> 0 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 /> PikeGregory <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9602G37 EEE <1 <br />