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Sequoia 680 Chesapeake Drive Reawood City CA 94003 (415) 364 9600 FAX(415) 364 9233 <br /> X1,1 Analytical 404 NW,get lane Walnut Creek CA 94598 (510) 988 9600 FAX (519) 988 96:3 <br /> 819 Sinker Avenue Suite a Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> 1* <br /> Delta Environmental Consultants Client Proleci ID Unocal 5886 <br /> 3164 Gold Camp Or, Suite 200 Matrix Sod <br /> ' Rancho Cordova, CA 95670 <br /> Attention Enc Holm CC Sample Group 5071405-7, 11-13 Reported Aug 4, 1995 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> Method. EPA 8020 EPA 8020 EPA 8020 EoA 8020 EPA 8015M <br /> Analyst C Chapman C Chapman C Chapman C Chapman C Lee <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 11atch# LCS1172895 LCS072895 LCS11721195 LCS072895 LCS080195 <br /> Date Prepared 7/28/95 7/28/95 7/28/95 7/28/95 8/1/95 <br /> Date Analyzed- 7/28/95 7/28/95 7/28/95 7/28/95 8/3/95 <br /> Instrument I D.# GCHP-4A GCHP-dA GCHP-4A GCHP-4A GCHP 3B <br /> LCS % <br /> Recovery 102 101 102 102 113 <br /> Control Limits. 75-125 75-125 75-125 75-125 50-150 <br /> MS MSD <br /> Batch #' 5071410 5071410 5071410 5071410 5071412 <br /> Date Prepared 7/28/95 7/28/95 7/28/95 7/28/95 8/1/95 <br /> Date Analyzed 7/28/95 7/28/95 7/28/95 7/28/95 8/3/95 <br /> Instrument I D #- GCHP-4A GCHP-4A GCHP-4A GCHP-4A GCHP 3B <br /> Matrix Spike <br /> % Recovery* 81 83 84 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 92 94 96 <br /> Relative % <br /> Difference 10 10 11 6 4 <br /> 1 <br /> SEQUOIA ANALYTICAL Please Mote <br /> l ' The LCS is a control sample at known interterent free matrix that is analyzed using the same reagents <br /> preparation and analytical methods emoloyed for the samples The LCS% recovery aata is uses for <br /> validation of sample batcn results Due to matrix etfects 'he CC limits for Nis/MSDs are advisory only <br /> ' Linda C Schneider and are not used to accept or reject batch results *Matrix interference <br /> Prolect Manager <br /> 507140501-7 <4> <br /> K <br />