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4 Sequoia 680 Chesapeake Drive Redwood CityCA 94063 (415) 364 9600 FAX(415)364 9233 <br /> D404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988%73 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> groundwater Technology Client Project ID`t Chevron#9-1918, Stockton,,A ` ` ," ' �" ASA>, <br /> 1401 Halyard Drive, Suite 140 Matrix Soil <br /> } West Sacramento, CA 95691 x <br /> =}Attention Mason Fedota QC Sample Group 5060371-379 Reported <br /> '�,:}k ♦ [ t�..i n}1 } w v } t • �� w n �ry { v ` t {v•vv Y.np i v n Yui� y tv <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 ug/L 20 Pg/L 20 ug/L 60 jrg/L <br /> LCS Batch# LCS060895 LCS060895 LC$060895 LCS060895 <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-4 GCHP-4 GCHP-4 GCHP-4 <br /> LCS % <br /> Recovery los 110 114 114 <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> MS/MSD <br /> Batch # 5060635 5060635 5060635 5060635 <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 # GCHP4 GCHP-4 GCHP4 GCHP-4 <br /> Matrix Spike <br /> %Recovery 105 105 110 108 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 110 110 112 <br /> Relative % <br /> Difference 0 0 a 7 00 36 <br /> SEQUOIA ANALYTICAL Please Note <br /> �/ The 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 LGS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for IVIS/MSDs are advisory only <br /> LindaSchneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5060371 GRtW <4> <br />