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i <br /> rD Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 1 FAX(415) 364 9233 <br /> 1900 Bates Avrnuc,Suite L Concord CA 94520 (510) 686-9600 FAX(510)686-9689 <br /> �I - Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAx(916)921 OIDO <br /> M <br /> -- u V"i <br /> RESNA s+1,`hr N, �3+453�,aYF..Aai+«x^VS,Y�✓..vYh,�cAc.,\r+�roac],v'r4i!FG.cf9i[a4Xn.1\k.,.K.. <br /> F <br /> Client Project ID 150103 01, Chevron Stockton <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 ' <br /> Attention John Lane CC Sample Group 9409015-01-2 x Rgported Seip 15, 1994 <br /> '" n <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch#: 940912106 940912106 940912106 940912106 <br /> Date Prepared- - - - - <br /> Date Analyzed: 9/12/94 9/12/94 9/12/94 9/12/94 <br /> Instrument I D.#: GCHP-17 GCHP-17 GCHP-17 GCHP-17 <br /> Conc. Spiked: 1opg/L 10ug/L 10pg/L 30ug/L <br /> Matrix Spike <br /> % Recovery. 99 96 96 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 100 <br /> Relative% <br /> Difference: 10 41 41 30 <br /> "� }a.M 2.'K<��uamcN r� ,-•' � , " ,� � ? w t. ,n> f. 4 `n S•.Yhyn{+bw+•ir t�'f,nv,h Y+Y{4)�C+f"++n^< <br /> '�F'v \a[Fo•�'�A.�'.��Piti�) � t� Fvx 41'. �� . FS� yx Y hv, n. . S { \ S 44r h S '�''}ti.r h iT$v Gt# �}x <br /> LCS Batch#: - - - - <br /> Date Prepared: - - - - <br /> Date Analyzed: - - - <br /> Instrument I.D.#: - - - - <br /> LCS% <br /> Recovery: - - - - <br /> %Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 <br /> Please Nate <br /> The LCS is a control sample of known,interferent tree matrix that is analyzed using the same reagents. <br /> SEQUOIA ANALYTICAL 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 I <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tagtte Clark <br /> Project Manager 9409015 WAT <2> <br />