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680 Chesapeake Drive Redwood Gry CA 94063 (550)364-9600 FAX(650) 4-9233 <br /> Sequoia 404 N Wiget Cara Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue,Suite sacraments 95834 (416)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North,Ste D Petaluma.G 99 4954 (707)792-1865 FAX(707)792-0342 <br /> v-0r4+.vun.W'S r,,.yv r�-.w+nuu}y.y+vr rY ik]nv ,N Jn O'rvvv . +'^y Sn 6}+ r�•�n` r wv]n vv r niu;r n, nr� lr rr.. ».i10`kr,+.4,xw ryy <br /> 'i r rr, . r ♦ ry n rr vj. <br /> �Gettler Ftyan/Geostrategles Cilent+Proiect ID Chevron 916171, Stockton n <br /> u6747 Sierra Court, Ste J Matrix Liquid <br /> iDublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9808B24 -01-07 Reported Sep 9, 1998 - <br /> i Su ^r.+hY r.Vv i n ♦n r ` t {'` r ~i n 'i^e r r~ C n.vu�.r,n rr}, rWa4YAvrrK'r/r r nvn xr v v r r r x ,x v n <br /> 4'G' v,Mv`+. rvr rr r vn N j'v4N}=+.+ ++.., r r,+.v ,n,x n,♦u r <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC Batch# GC083198802009A GCO83198802009A GCO83198802009A GCO83198802009A GCO83198802009A <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- D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD#: 8082021 8082021 8082021 8082021 8082021 <br /> Sample Conc ND N D N D N D ND <br /> Prepared Date: 8/31/98 8/31/98 8/31/98 8/31/98 8/31/98 <br /> Analyzed Date 8/31/98 8/31/98 8/31/98 8/31/98 8/31/98 <br /> Instrument LD #: HP9 HP9 HP9 HP9 HP9 <br /> Conc, Spiked 20 pg/L 20 pg/L 20 pg/L 60 pg/L 230 pg/L <br /> Result 17 18 22 65 540 <br /> MS % Recovery* 85 90 110 108 235 <br /> Dup. Result. 18 20 20 64 280 <br /> MSD % Recov 90 100 100 107 122 <br /> RPD 57 105 95 16 634 <br /> RPD LimFt: 0-20 0-20 0-20 ago 0-50 <br /> LCS #: LCS083198 LCS083198 LCS083198 LCS083198 LCS083198 <br /> Prepared Date. 8/31/98 8/31/98 8/31/98 8/31/98 8/31/98 <br /> Analyzed Date- 8/31/98 8/31/98 8/31/98 8/31/98 8/31/98 <br /> Instrument LD #. HP9 HP9 HP9 HP9 HP9 <br /> Conc Spiked 20 pg/L 20 pg/L 20,u9/L 60 pg/L 230pg/L <br /> LCS Result 19 20 22 65 280 <br /> LCS %Recov.: 95 100 110 108 122 <br /> 60-140 60-140 60-140 ' 60-140 <br /> LCS 70-130 70-130 70.130 70-130 60-140 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> Elap #1 71 preparation,and analytical methods employed for the samples The matrix spike is an allquot 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 fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> ego <br /> Pro ct Manager '*MS-Matrix Spike,MSD=MS Duplicate, RPD-Relative%Difference 9808B24 GET <1> <br /> r� <br />