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i <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Protect ID Cal Fuels Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 5632 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 04-10-03 <br /> Stockton, CA 95215 Analyst Jim Phillips Analyzed 04-10-03 <br /> Attn Tim Cuellar Reported 04-18-03 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 210 1 32 794 184 922 <br />' Units ug/L uglL ug/L ug/L ug/L ug/L <br /> LCS Batch# VW-4103 VW-4103 VW-4103 VW-4103 VW-4103 VW-4103 <br />' 969% 603% 579% 842% 105% 102% <br /> Surrogate Recovery 105% 103% 103% 103% 103% 103% <br />' Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch 11 VW-4103 VW-4103 VW-4103 VW-4103 VW-4103 VW-4103 <br />' Spike Concentration 110 210 1 32 794 1 84 922 <br />' MS % Recovery 938% 553% 409% 717% 961% 944% <br /> Surrogate Recovery 991% 947% 947% 947% 947% 947% <br /> MSD% Recovery 975% 598% 435% 763% 999% 988% <br /> Surrogate Recovery 100% 967% 967% 967% 967% 967% <br /> Relative% Difference 376% 7 81% 615% 619% 385% 453% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 876% 946% 946% 946% 946% 946% <br /> The LCS (Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes 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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> r <br /> 1 <br /> ANALYST PROVED BY <br />' C Cone Jam hlltips <br /> ' L oratory Director <br /> i <br />