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esapea a Drive Redwoo ty 4 3 4;� 4 FAX(415) 364 9233 <br /> 404 aN Wiget Lane \`falnut Creek Ca 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 919 Striker Avenue Suite 3 Sacramento CA 95834 (916) 921 9600 FALX(9 16)921 0100 <br /> Delta Environmental Consultants Cilent Project ID Unocal #5886 <br /> 3164 Gold Camp Or, Suite 200 Matrix Sail <br /> Rancho Cordova, CA 95670 <br /> Attention Eric Holm CC Sample Group 5091247-1256 Reported Oct 5, 1995 <br /> 1 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# LCS100295 LC3100235 LCS100295 LCS100295 <br /> Date Prepared 10/2,195 10/2/95 10/2/95 10/2/95 <br /> Date Analyzed 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 <br /> LCS % <br /> Recovery 103 103 104 102 <br /> Control Limits. 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 5090942 5090942 5090942 5090942 <br /> ' Date Prepared- 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Date Analyzed 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 <br /> ' Matrix Spike <br /> % Recovery- 88 90 90 92 <br /> ' Matnx Spike <br /> Duplicate % <br /> Recovery 92 93 93 94 <br /> ' Relative % <br /> Difference 4 4 33 3 3 22 <br /> ' SEQUOIA ANALYTICAL Please Note <br /> f The LCS is a control sample of known interferent tree matrix that 1s analyzed using the sarre reagents <br /> preparation and analytical methods emptoyed for the samples The LCS ecovery data is usea for <br /> - - validation or samoie hatch results Due to matrix erfects he QC limits-or VIS,MSDs are advisory only <br /> Linda C Schneider and are not used to accept or resect baton results <br /> Project Manager <br /> 5091247 D t-T <3- <br /> �J <br />