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r <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209) 384-2930 <br /> rCertificate#2079 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Pro)ect 10 Top Filling Method EPA 5030/8015M 8020 <br /> r of Northern California Reference Number 3064 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 622-00 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 6-22-00 <br /> Attn Tim Cuellar Reported 6-28-00 <br /> r <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 222 1 34 782 1 84 948 <br /> Units ug/L ug/L ug/L ug/L ug1L ug/L <br /> LCS Batch# VW-6220 VW-6220 - VW-6220 VW-6220 VW-6220 VW-6220 <br /> LCS %Recovery 975% 977% 874% 855% 848% 825% <br /> Surrogate Recovery 102% 103% 103% 103% 103% 103% <br /> Control Limits 70-130% 70 130% 70-130% 70-130% 70-130% 70-130 % <br /> MS/MSD Batch# VW-6220 VW 6220 VW-6220 VW-6220 VW-6220 VW-6220 <br /> Spike Concentration 110 222 1 34 7 82 1 84 948 <br /> MS % Recovery 112% 146% -836% 589% 197% 434% <br /> Surrogate Recovery 110% 737% 737% 737% 737% 737% <br /> MSD%Recovery 71 9% 194% -717% 762% 527% 751% <br /> Surrogate Recovery 111% 1000/0 100% 100% 100% 100% <br /> Relative% Difference 163% 286% 897% 245% 192% 262% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 101% 984% 984% 984% 984% 984% <br /> The LCS (Laboratory Check Sample)is a control sample of known interferent tree 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 valsdation <br /> of sample batch results Due to matrix effects the OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST ZGG APPROVED BY <br /> Glary J Cone Ja e C Phillips <br /> F vrronmental Lab Duectoi <br />