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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX (415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Oko-iirategieg Inc Client Projec0i)rvr Unocal#6981 v <br /> 4 3035 Prospect Park Dr, Suite 80 Matrix Air <br /> Rancho Cordova, CA 95670 <br /> 'Attention Greg Gurss QC Sample Group 5050921-922 Reported May 23, 1995 <br /> nn�+i2 `. o{ ry � r r { Ar 1 + } r ,. nN}+ � r r. h+rv� }r . r .• {v v <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/m' 2 0 mg/m' 6 0 mg/m' <br /> LCS Batch#. LCSOS1995 LCS051995 LCS051995 LCS051995 <br /> Date Prepared. 5/19/95 5/19/95 5/19/95 5/19/95 <br /> Date Analyzed 5/19/95 5/19/95 5/19/95 5/19/95 <br /> Instrument LD #. GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS <br /> Recovery 93 90 94 92 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> �'n{''v}.. „ ♦ r `• iri J ' rn vrti rr+i , ♦ r`.} r�nLti rr Kr s nr rry +r + <br /> w+,L r. n fi r{ r� M1 n + �, f} w C` ♦ s 1�4 r` r v r{v r { r r ` }�{r r♦ ry ti` {r r �r r n v r `r v v v v ry 6+} i ` •r v r ` +ry } <br /> MS/MSD <br /> Batch#' BS051995 BS051995 BS051995 B8051995 <br /> Date Prepared 5/19/95 5/19/95 5/19/95 5/19/95 <br /> Date Analyzed' 5/19/95 5/19/95 5/19/95 5/19/95 <br /> Instrument LD # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 93 90 94 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 92 92 93 93 <br /> Relative% <br /> Difference 11 22 11 11 <br /> SEQUOIA ANALYTICAL Please Dote <br /> f (, r� 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 /> validation of sample batch results pita to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Janet arlan and are not used to accept or reject hatch results <br /> Project Manager <br /> 5050921 GSI <2> <br />