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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 Straker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RESNA Client Project ID 150002 00, Laidlaw <br /> 1710 Main Street Matrrx Liquid n, <br /> Escalon, CA 95320 <br /> Attention John Lane QC Sample Group 4E32201-2 Reported May 19, 1994,, <br /> r <br /> r r r v , .z Y ri Y n v , n r r n ra h v } n r r ♦ vv w n w v. v'}n{v r y�ir' v}r irrrrv+Arsa++rvvV ciE�}trvJ rc•L{ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl xylenes <br /> Benzene <br /> Method. EPA 8020 EPA 8020 EPA$020 EPA 8020 <br /> Analyst: J Fontcha J Fontcha J Fontcha J Fontcha <br /> MS/MSD <br /> Batch#. BLK051294 BLK051294 BLK051294 BLK051294 <br /> Date Prepared- 5/12/94 5/12/94 5/12/94 5/12/94 <br /> Date Analyzed 5/12/94 5/12/94 5/12/94 5/12/94 <br /> Instrument I D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Conc. Spiked: 20pg/L 20yg/L 20N9/L 60F+9/L <br /> Matrix Spike <br /> % Recovery. 100 100 95 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 102 <br /> Relative% <br /> Difference 00 00 51 4 0 q <br /> wFrvh <br /> i ♦ s ri r ♦ ' t r r .{ to{r vt}t~�ri s vv{vuirx.fri{n Mv4 ti4�i$rA�n i'ii{ O� <br /> LCS Batch#: lLCS051294 1LCS051294 1LCS051294 1LCS051294 <br /> Date Prepared: 5/12/94 5/12/94 5/12/94 5/12/94 <br /> Date Analyzed: 5/12/94 5/12/94 5/12/94 5/12/94 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 102 99 99 100 <br /> % Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 <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 #1271 preparation,and analytical methods employed for the samples The matnx spoke Is an aliquot of sample <br /> ,1rt� fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> U� the recovery of analytes from the matrix spike does not fall within specified control Iimits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 4E32201 WAT <2> <br />