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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233-- <br /> 404 N Wigec Lane Walnut Crcck CA 94598 (514) 998 9600 FAX (510)988%73 <br /> 11 Analytical 819 Striker Avenue,Suite 8 Sa[ramento CA 95834 (916) 911 9600 FAX (916) 921 0100 <br /> A <br /> Pacific Environmental Group, Inc Client Project ID Arco 2133, Stockton <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> '-Attention Greg Barclay QC Sample Group 6031010-25 Reported Apr 3, 1996 <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 v0/8W VO/BW VO/BW VO/BW <br /> Concentration <br /> Spiked. 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS032896 LCS032896 LCSW2896 LCS032896 <br /> Date Prepared 03/28/96 03/28/96 03/28/96 03/28/96 <br /> Date Analyzed- 03/28/96 03/28/96 03/29/96 03/28/96 <br /> Instrument I D.#- GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery. 92 94 96 95 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> 4i{ yv....+L` c +`S! vu ? t . v 14•♦ c{%v•.w. S rf rhanh nv+r nv ryq *1 A+ • 1 r r } H{{raJu. t Y v}} vin} ��^.u'Ow4,Y> <br /> r. } + +s,rr: ♦{ir}H,.n-rvr v w tttr,r. } + rn "R r} , ,.s ry r`!{',• '` Sx~~.vw..vrwls`vhry} tr Y� vn un },,, ry{}t v r v xxrc } <br /> MS/MSD <br /> Batch # 6031174 6031174 6031174 6031174 <br /> Date Prepared- 03/28/96 03/28/96 03/28/96 03/28/96 <br /> Date Analyzed. 03/28/96 03/28/96 03/28/96 03/28/96 <br /> Instrument I D #: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 86 86 87 86 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 86 87 88 87 <br /> Relative % <br /> Difference. 00 12 11 12 <br /> SEQUOIA ANALYTICAL Please(vote <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> I/��L~tr✓��� ����� ' preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> 1 G validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors Try <br /> 6031010 PES a8> <br />