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. CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Krazan & Associates Inc Client Pro)ect ID 034-99039 Method EPA 5030/801 5M 8020 <br /> 215 W Dakota Avenue Reference Number 2062 Instrument ID Var-GC1 <br /> Clovis CA 93612 Matrix Sod Prepared 2 22 99 <br /> Attn Bruce Myers Analyst Clari Cone Analyzed 2 2223-99 <br /> Reported 226 99 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 220 42 1 30 1 150 36 5 179 <br /> Units mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VS-2229 VS-2229 VS-2229 VS-2229 VS-2229 VS-2229 <br /> LCS % Recovery 980% 116% 922% 95 1% 972% 90 3% <br /> Surrogate Recovery 106% 103% 103% 103% 103% 103% <br /> •Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VS-2229 VS-2229 VS-2229 VS-2229 VS-2229 VS-2229 <br /> MS % Recovery 92 7% 85 3% 83 1% 862% 874% 81 2% <br /> Surrogate Recovery 95 5% 927% 927% 927% 92 7% 92 7% <br /> I <br /> MSD % Recovery 87 3% 95 7% 843% 870% 882% 824% <br /> Surrogate Recovery 96 7% 93 B% 938% 938% 938% 93 8% <br /> Relative % Difference 5 94% 11 5% 142% 0919% 0 956% 1 48% <br /> Methanol Blank NO ND ND ND ND NO <br /> Surrogate Recovery 100% 100% 100% 100% 100% 100% <br /> I <br /> Please Note <br /> The LCS (Laboratory Check Samplel is a control sample of known, interferent free matrix that is fortified with representative anaiytes and <br /> analyzed using the same reagents preparation and analytical methods employed for the samples The LCS % recovery is used for validation <br /> of sample batch results Due to matrix effects the QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST j � APPROVED BY t� / <br /> Clan J Cone / J es Phillips <br /> 0 Environmental Cab Director <br />