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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9,233 <br /> 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988-9673 <br /> WOF Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Delta i nvironmental Consultants Client Project ID 5.aon-#7-3708, Stockton ry <br /> 3164 Gold Camp Dr, Suite 200 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Todd Galati QC Sample Group 5121441-44 Reported Jan 2, 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 V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked: 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS122995 LC5122995 LCS122995 LCS1=95 <br /> Date Prepared 12/29/95 12/29/95 12/29/95 12/29/95 <br /> Date Analyzed: 12/29/95 12/29/95 12/29/95 12/29/95 <br /> Instrument LD # GCHP-1 GCHP-1 GCHP 1 GCHP-1 <br /> • LCS % <br /> Recovery, 92 98 97 95 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch#- 5121444 5121444 5121444 5121444 <br /> Date Prepared. 12/29/95 12/29/95 12/29/95 12/29/95 <br /> Date Analyzed 12/29/95 12/29/95 12/29/95 12/29/95 <br /> Instrument LD # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 84 92 90 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 88 102 100 97 <br /> Relative % <br /> Difference 46 10 10 53 <br /> EQUOIA ANALYTICAL Please dote <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 far the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects the CC limits for MS/MSD's are aavlsory only <br /> / Linda C Schneider and are not used to accept or refect batch results <br /> Project Manager 5121441 DLT <2> <br />