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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (41-')) 364 9600 FAX(415) 364 9233 <br /> I � <br /> Analytical 819 <br /> N Weget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 938 9673 <br /> C1 819 Sinker Avenue Suar 3 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Delta Environmental Consultants Client Project ID Unocal 7-05886 <br /> 3164 Gold Camp Dr, Suite 200 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Eric Haim ()C Sample Group 5071456-1465 Reported Aug 4, 1995 <br /> ' QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> eenzene Taiuene Benzene Xylenes Diesel <br /> Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Analyst C Chapman C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 7 5 mg/kg <br /> LCS Batch#' LCS080195 LCS080195 LCS080195 LCS080195 LCS080295A <br /> Date Prepared. 8/1/95 8/1/95 8/1/95 8/1/95 8/2/95 <br /> Date Analyzed. 8/1/95 8/1/95 8/1/95 8/1/95 8/3/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 GCHP 38 <br /> LCS % <br /> Recovery 100 99 98 97 105 <br /> Control Limits. 75-125 75-125 75-125 75-125 60-130 <br /> 1 <br /> MS/MSD <br /> Batch #- 5071491 5071491 5071491 5071491 5071160 <br /> Date Prepared 8/1/95 8/1/95 8/1/95 8/1/95 7/26/95 <br /> Date Analyzed 5/1/95 a/1/95 8/1/95 8/1/95 8/4/95 <br /> Instrument l D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 GCHP 36 <br /> Matrix Spike <br /> % Recovery 86 87 90 94 103 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 98 97 98 98 107 <br /> Relative % <br /> Difference 13 11 85 42 38 <br /> 1 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using ase same reagents <br /> preparation and analyticai methods emeloyed for the samples The LCS'❑ recovery data is used for <br /> r validation of sample batch results Due to matrix erfec•s ,he CC limits tar MS/MSC s are aavisoryonly <br /> Linda C Senneider ana are not used to accept or resect batch results <br /> Project Manager <br /> 5071456 DLT �s> <br />