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64 9233 <br /> 404 N W get Lane Walnut Creek CA 94599 (510) 984 9600 FAX(510) 988 9673 <br /> Analytical 819 S[rikcr Avenue Suete 9 Sacramento CA 95834 (916) 921 9600 FAX{916) 921 0100 <br /> Delta Environmental Consultants Client Project ID Unocal #5886 <br /> 3164 Gold Camp Or, Suite 200 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Eric Holm CC Sample Group 5091247-1256 Reported Oct 5 1995 <br /> 1 <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# LCS092795 LCS092795 LCS092795 LCS092795 <br /> ' Date Prepared 9/27/95 9/27/95 9/27/95 9/27/95 <br /> Date Anaiyzed 9/27/95 9/27/95 9/27/95 9/27/95 <br /> Instrument 1.D #' GCHP-1 GCHP 1 GCHP 1 GCHP-1 <br /> ' LCS % <br /> Recovery' 102 102 102 101 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> ' MS/MSD <br /> Batch #- 5091249 5091249 5091249 5091249 <br /> ' Date Prepared 9/27/95 9/27/95 9/27/95 9/27/95 <br /> Date Analyzed 9/27/95 9/27/95 9/27/95 9/27/95 <br /> Instrument 1 D # GCHP-1 GCHP 1 GCHP 1 GCHP-1 <br /> ' Matrix Spike <br /> % Recovery* 99 98 99 98 <br /> ' Matrix Spike <br /> Duplicate To <br /> Recovery 100 98 99 98 <br /> ' Relative °o <br /> Difference 1 0 00 00 00 <br /> ' SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interrerent free matrix that is analyzed using the Sarre reagents <br /> preparation and analytical methods emoioyed tar the samples The LCS'o .ecovery data is used for <br /> validation of sample batc"1 results Due to matrix erfec-s he OC limits for MS/MS0.5 are aev=r.'only <br /> Linda C Schneider and are not used to accect or reject batch results <br /> Project Manager <br /> 5091241 Du7 �6: <br />