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4 Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9133 <br /> 404 N Wrget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> War Analytical 8t9 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> groundwater TechnologyClient Project Ifs x Chevron #9-1918, Stockton, CA <br /> 1401 Halyard Drive, Sulte 140 Matrix Soil <br /> West Sacramento, CA 95691 <br /> Attention Jason Fedota OC Sample Group 5060371-379 Reported <br /> - <br /> I <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. JF AT MC JF AT MC JF AT MC JF AT MC <br /> Concentration <br /> Spiked 20 pg/L 20 pg/L 20 pg/L 60 pg/L <br /> LCS Batch#; LCSOW895 LCS060895 LCS060895 LCS060895 <br /> Date Prepared 6/8/95 6/6/x5 6/8/95 6/8/95 <br /> Date Analyzed 6/8/95 6/8/95 6/8/95 6/8/95 <br /> Instrument I D# GCHP-5 GCHP-5 GCHP-5 GCHP 5 <br /> . <br /> LCS% <br /> Recovery. 99 94 99 102 <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> MS/MSD <br /> Batch# 5060223 5060223 5060223 5060223 <br /> Date Prepared 6/8/95 6/8/95 6/8/95 6/8/95 <br /> Date Analyzed 6/8/95 6/8/95 6/8/95 6/8/95 <br /> Instrument I D# GCHP-5 GCHP-5 GCHP-5 GCHP 5 <br /> Matrix Spike <br /> % Recovery. 100 100 100 105 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 105 105 105 102 <br /> Relative% <br /> Difference 4 9 4 9 49 2 9 <br /> SEQUOIA ANALYTIC Please Note <br /> f� The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> v � preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the OC limits for MS/MSDs are advisory only <br /> Linda Cfchi `� and are not used to accept or reject batch results <br /> Project Manager <br /> 5060371 GRW ¢5> <br />