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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> ,!D1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686-9600 FAX(510)686 9689 <br /> IQF Analytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> Ol-6 West,'(nc ' n `" "A v Mien+t P`rojeci ll) Shell, 141 Nf EI Dorado, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Air <br /> Roseville, CA 95678 <br /> Attention Sudhakar Talankl OC Sample Group 5050730-732 Reported May 17, 1995 <br /> x r vl x w +Y w k }f f {4v rs iJ. v[ s .s viN f�,.-�vi�.v .�.'`�trr:... 4i.v w-"rt7 i ♦} Fv �y,v N-0n r x { v nt rro r4 v r ,. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst- C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 2 0 mg/m' 2 0 mg/ms 2 0 mg/ma 6 0 mg/m' <br /> LCS Batch#- LCSDS1295 LCS051295 LCS051295 LCS051295 <br /> Date Prepared 5/12/95 5/12/95 5/12/95 5/12/95 <br /> Date Analyzed, 5/12/95 5/12/95 5/12/95 5/12/95 <br /> Instrument 1-D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> is Recovery: 95 95 96 9s <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> r rr f.f +fy+4n n1 n ' ley fw t ry n4v nv.hr hvfh{.M fN N + vv ,.v ♦ t + w u t r 4 <br /> { ry t f { o f f rc nn n <br /> n w vv v +. ry v {nrrxr r v + Jnr r r + ++ + w+. vw+ v .vh+.w v ffr_ r vi v v+ vv ♦r 1 +• <br /> MS/MSD <br /> Batch # BLK051295 BLK051295 BLK051295 BLK051295 <br /> Date Prepared 5/12/95 5/12/95 5/12/95 5/12/95 <br /> Date Analyzed 5/12/95 5/12/95 5/12/95 5/12/95 <br /> Instrument I D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 95 95 96 95 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery` 92 89 93 93 <br /> Relative % <br /> Difference: 32 65 3 2 21 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> /,J/, validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> inda C Schne der and are not used to accept or reject batch results <br /> Project Manager <br /> 5050730 FUG <2> <br />