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4Sequoia 680 Chcsapcake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> I404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> q% Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Pacific Environmental Group, Inc Client Project ID Unocal 2859 Stockton,ackton, CA <br /> 2025 Gateway Place, Suite 440 Matrix Air <br /> San Jose, CA 95110 <br /> Attention Rhonda DeJung QC Sample Group 6080034-35 Reported Aug 14, 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 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCSOB0296 LCS080296 LCS080296 LCS080296 <br /> Date Prepared 08/02/96 08/02/96 08/02/96 08/02/96 <br /> Date Analyzed 08/02/96 08/02/96 08/02/96 08/02/96 <br /> Instrument LD # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 110 112 110 112 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch# BS080296 BS080296 BS080296 BS080296 <br /> Date Prepared 08/02/96 08/02/96 08/02/96 08/02/96 <br /> Date Analyzed 08/02/96 08/02/96 08/02/96 08/02/96 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 110 112 110 112 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 112 114 112 113 <br /> Relative % <br /> Difference 18 18 1 8 089 <br /> SEQUOIA ANALYTICAL Please Note <br /> 7 The LCS 1s 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 LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C Schnee er and are not used to accept or refect batch results <br /> Project Manager/Sacramento Labors ory <br /> 6060034 PEG <2> <br />