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680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(4 15) 364 9233 <br /> ' 4114 N Wiget Lan, Walnut Creek CA 94598 (5101 938 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FkX(9 16)921 0100 <br /> 160eita Environmental Consultants Client Project ID Unocal 5886 <br /> 3164 Gold Camp Or, Suite 204 Matrix Sod <br /> Rancho Cordova, CA 95670 <br /> Attention Eric Holm OC Sample Group 5071405-7, 11-13 Reported Aug 4, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> ' Method EaA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. 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 <br /> LCS Hatch# LCS073195 LCS073195 LCS073195 I_CS073195 <br /> Date Prepared 7/31/95 7/31/95 7/31/95 7/31/95 <br /> Date Analyzed 7/31/95 7/31/95 7/31/95 7/31/95 <br /> Instrument LD #' GCHP-1 GCHP-1 GCHP 1 GCHP 1 <br /> 1 LCS % <br /> Recovery- 101 103 101 105 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> ' MS/MSD <br /> Batch # 5071030 5071030 5071030 5071030 <br /> ' Date Prepared- 7/31/95 7/31/95 7/31/95 7/31/95 <br /> Date Analyzed. 7/31/95 7/31/95 7/31/95 7/31/95 <br /> Instrument 1 D ##- GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> ' Matrix Spike <br /> % Recovery. 79 86 Be 95 <br /> ' Matrix Spike <br /> Duplicate % <br /> Recovery 90 94 94 100 <br /> ' Relative % <br /> Difference 13 88 88 51 <br /> 1 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sampie of known interterent free matrix that s analyzed using the same reagents <br /> preparation and analytical methods emuloyea for he samples The LCS'b recovery data,s used for <br /> validation OT samwe baton results Oue to matrix effects the CC limits or MS/MSO s are aavisory oniv <br /> Linda C Schneider and are not used to accept or resect batch results <br /> Project Manager <br /> 5071405 OLT <3> <br />