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Sequoia 680 Chesapeake Drive Rcdwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> 11co Analytical a19 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 911 9600 FAX(916}911 0100 <br /> Delta Environmental Consultants Client Project lD icon #7-3708, Stockton <br /> 3164 Gold Camp Dr, Suite 200 Matnx Sad <br /> Rancho Cordova, CA 95670 <br /> Attention Todd Galati QC Sample Group 5121441-44 Reported ,tan 0, 1900 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes <br /> Method: EPA 6020 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# LCS010296 LCS010296 LCS010296 LCS010296 <br /> Date Prepared 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Date Analyzed 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> 10 LCS % <br /> Recovery 97 99 100 99 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# 5121282 5121282 5121282 5121282 <br /> Date Prenared 1/2/96 1/2/196 1/2/96 1/2/96 <br /> Date Analyzed 1/2/96 1/2/96 1/2/96 1/2/96 <br /> Instrument LD # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery- 90 94 95 94 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 100 100 103 <br /> Relative % <br /> Difference 64 62 5 1 91 <br /> SEQUOIA ANALYTICAL Please Note <br /> A The LCS is a control sample of known interferent'ree matrix that 1s analyzea using the same reagents <br /> preparation and analytical methods employed for the samples The LCS o recovery data is used`or <br /> validation of sample batch results Due to matrix effects,the CC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5121441 DLT �3> <br /> xa <br />