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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 404 N.Wlget lane Walnut Crede.CA 94598 (925)988-9600 FAX(925)988-%73 819 5tr1ker Avenue.Suite 8 Sacramento.U 95834 (916)921-9600 FAX(916)921-0100 Analytical 1455 McDowell Blvd.North,Ste.D Petaluma.CA 94954 (707)792-1865 FAX(707)792-034x i::}:;:u+w._uv::....?u:`:?r:u:.++•.vn:u•n:..w.w.n:u•.•x.wnvnv�..0:..::uv:r:.xw::w: v:n:..w:.:•:e-.vw::..•.:.v..::::nv.•rx:n.nv:::n.u...::..uv:vn•.:v. ..wvwn v..::-:.nv.:vv.:v.wn ::w.. ?s.:.uy:.xx-w:-.m::x-.�.u.A'•JY.n...-- an ..:rr::..:::.: i,;,y;•.;;^;. .. ...r: .. .v.:.... ..:................... ........ ..n..-.. .-...... -.�:.::v-:::•:::.::::.:::.::.�::::.v::::::.v::::.:_:.:v::r:.^?..::.-rW.::.r^!••:::.} +} '4 .HY:: ..7' ....:.....[..:.. ..... n...n...n.........r.....x:.....:..n.. ...... ...............v......:.:n. ... .n.:.r.n...v.::..}.......}}}y.:i:::{.•:i;; ..f!:.::r: .... ..........nn. ....n:xvo.-..::........:.....:.r.: ..... .. ... :. ..,r..:.:.:.....w.... .. k r x:.�..o. Vito.+.\iai'[f.,:..:.[G`e':�:TF'::_:�:t'{�'.1:i:'i.::4{.L•w;[i. :::.-i..W:n. #Gertler Ryan ..;:...n:.:.4..v.�. ..... :....... .....::..... ::..w.:[[ -<.:...>. .. /Geostrategles Client Project ID:...Tosco,8203 E 1�th. ,16747 Sierra Court,Ste J Matrix: Liquid r>< ;;?Dublin, CA 94568 yf :y t`Attention: Deanna Harding Work Order#: 9812066 01-04 Reported: Dec 22, 1998-'3. ria ... ....:.,:. .. .. .,::...:...:.- ... :.- ....r .... .. .:..:..:r:....nr......:..w.:.....:..,.................r....:...... ..... ... :,rr.:... ...:..rrn....rr.. ....rrv�,Gv:•:vn ...... r. .v::0:=-'SRT.: ...... r.........r.r.:=i9G:•...r.....r ....rrv.::•:J:'":.... QUALITY CONTROL DATA REPORT Analyte: Benzene Toluene Ethyl Xylenes BTEC as TPH Benzene QC Batch#: GC120898802006A GC120898802005A GC120898802005A GC120898802005A GC120898802005A Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 Analyst: C.Westwater C.Westwater C.Westwater C.Westwater C.Westwater MS/MSD#: 8120292 8120292 8120292 8120292 8120292 Sample Cone.: 2.5 N.D N.D N.D N.D Prepared Date: 12/8/98 12/8/98 12/8/98 12/8/98 12/8/98 Analyzed Date: 12/8/98 12/8/98 12/8/98 12/8/98 12/8/98 Instrument l.D.#: HP5 HP5 HP5 HP5 HP5 Cane. Spiked: 20Ng/L 20Ng/L 20kg/L 60pg/L 280pg/L Result: 24 22 21 66 290 MS% Recovery: 108 1 l0 105 110 104 0 Dup. Result: 22 20 19 61 310 MSD %n Recov.: 98 100 95 102 111 RPD: 8.7 9.5 10.0 7.9 6.7 RPD Limit: 0-25 0-25 0.25 0.25 0-25 v.:.......:......:..:............ ..:.:........::..v:..,.....::.:..:...v...w.:............. :..... : .... :...:.................. ....... ...... :........... ...........,,-..--:....u:.. .Ys = >s LCS#: LCS120898 LCS120898 LCS120898 LCS120898 LCS120898 Prepared Date: 12/8/98 12/8/98 12/8/98 12/8/98 12/8/98 Analyzed Date: 12/8/98 12/8/98 12/8/98 12/8/98 12/8/98 Instrument I.D.#: HP5 HP5 HP5 HP5 HP5 Cane. Spiked: 20,ug/L 20Erg/L 20pg/L 60pg/L 2Wug/L LCS Result: 18 19 19 59 280 LCS % Recov.: 90 95 95 98 100 LCS 70.130 70-130 70-130 70-130 50.150 Control Limits Please Dote; The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, 7TodIA A ALYTICAL preparation,and analytical methods employed for the samples. The matrix spike Is an aliquot of sample 127 fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix Interference,the LCS recovery is to be used to validate the batch. nicherManager '*MS-Matrix Spike,MSD-MS Duplicate,RPD=Relative%Difference 9812068-GET <1> m