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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> IN&V Analytical 819 Stnkcr Avenue Suite 8 Sacramento CA 95834 (916) 921 96W FAX(916) 921 0100 <br /> Pacific Environmental Group, i Inc Client Project ID Arco 2133, Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 85742 <br /> Attention Greg Barclay QC Sample Group 6091247-67 Reported Oct 11, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X enes <br /> Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst* M C mc MC M C <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCS101096 LCS101096 LCS101096 LCS101096 <br /> Date Prepared. 10/10/96 10/10/96 10/10/96 10/10/96 <br /> Date Analyzed: 10/10/96 10/10/96 10/10/96 10/10/96 <br /> Instrument I.D.#' GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> • LCS % <br /> Recovery 94 95 95 94 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch#, 6100238 6100238 6100238 6100238 <br /> Date Prepared. 10/10/96 10/10/96 10/10/96 10/10/96 <br /> Date Analyzed, 10/10/96 10/10/96 10/10/96 10/10/96 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> Recovery' 97 99 99 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 99 100 100 99 <br /> Relative % <br /> Difference 2 0 1 0 1 0 20 <br /> SEQUOIA ANALYTICAL Please Note <br /> 0The 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 /> l � � 1 validation of sample batch results Due to matrix effects the 4C limits for MS/MSD s are advisory only <br /> I da C Schnei er and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> Q 6091247 PES <12> <br /> 0Sd' <br />