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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> 404 N W get Lane Walnur Creek CA 94598 (510)988 9600 FAX(510)988 Q673 <br /> Analytical <br /> p ��� ���� 819 Striker Avenue Suite 8 Sacramento CA 95834 1916)9ZS 9600 FAX (916) 921 0100 <br /> Iwo [ Ali "55 55 b1,Dowell Blvcf Vnrrh ',re rr) Pet ilunn�-C\ ^»)54 `7071 792 1 865 FAX 1707 792 0342 <br /> 0 <br /> Delta Environmental Consultants Client Project ID Exxon 7-3708 D093-809 <br /> 31 b4 Gold Camp Drive #200 Matrix Liquid <br /> Rancho Cordova CA 95670 <br /> Attention Jim Brownell Work Order # 98031-29 -01-07 Reported Apr 10 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toiuene Ethyl xylenes Gas <br /> Benzene <br /> QC Batch## GC040398BTE.X06A SC0403986TEX06A GC040398BTEXOrA GCO40398BTEX06A GC040398BTEX06A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 9803H1601 98031-11601 98031-11601 9803H1601 9803H1601 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Analyzed Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked 1Cgo/L lopg/L 1opg/L 30pg/L 50jig/L <br /> Result 98 9 7 99 30 fit <br /> MS % Recovery 98 97 99 100 103 <br /> Dup Result 12 12 12 36 15 <br /> MSD % Recov 12.0 120 120 120 123 <br /> RPD 20 21 19 18 19 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK040398 BLK040398 BLK040398 BLK040398 BLK040398 <br /> Prepared Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Analyzed Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conic Spiked ICpg/L lopg/L 10Pg/1- 30ug/L 60pg/L <br /> LCS Result 11 11 11 34 71 <br /> LCS % Recov 110 110 110 113 118 <br /> 60-14q 60 140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <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 /> EQUOIA 8WALYTICAL 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 tall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> 0ectManaqer <br /> ego <br /> ry <br /> y *"MS-Matrix Spike MSD=MS Duplicate RPD Relative °a Difference 98031-29 DLT <1> <br />