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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 Project ID Sierra Lumber Method EPA 5030/8015M,8020 <br /> of!Northern California Reference Number 8479 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 12-31-03 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 12-31-03 <br /> Attn Tim Cuellar Reported 01-06-04 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 2 10 1 32 7 94 1 84 922 <br /> Units ug1L ug1L ug/L ug/L ug/L ug/L <br />' LCS Batch# VW-D313 VW-0313 VW-D313 VW-D313 VW-D313 VW-D313 <br /> 112% 114% 108% 936% 976% 952% <br /> Surrogate Recovery 979% 969% 969% 969% 969% 969% <br />' Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br />' MSlMS❑Batch# VW-D313 VW-D313 VW-D313 VW-D313 VW-D313 VW-D313 <br /> Spike Concentration 110 210 1 32 794 184 922 <br /> MS % Recovery 994% NA* 102% 929% 957% 943% <br /> Surrogate Recovery 100% 100% 100% 100% 100% 100% <br /> MSD%Recovery 193% NA* 102% 935% 129% 123% <br /> ISurrogate Recovery 111% 105% 105% 105% 105% 105% <br /> Relative%Difference 440% NA* 0067% 0580% 293% 263% <br /> Method Blank ND ND ND ND ND ND <br /> Surrogate Recovery 920% 961% 961% 961% 961% 961% <br /> *Recovenes not calculated due to matnx interference <br /> The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> I 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 /> I <br /> r <br /> f ANALYST APPROVED BY <br /> 1 Glair J o e Z�'X <br /> Ja s C Phillips <br /> laboratory Director <br />