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' CASTLE ANALY <br /> TICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone f209) 384-2930 <br />' Certificate p2079 Fax 12091 384-1507 <br /> BSK Analytical Laboratories Client Project ID 9901/688 Method EPA 5030/8015M,8020 <br />' 1414 Stanislaus Street Reference Number 2036 Instrument ID Var-GC1 <br /> Fresno CA 93706 Matrix Water Prepared 2-6 99 <br /> Attn Sample Receiving Analyst Jim Phillips Analyzed 2-6-99 <br />' Reported 2-15-99 <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 uglL ug1L ug/L ug/L ug1L <br />' LCS Batch # VW 2069 VW-2069 VW-2069 VW-2069 VW-2069 VW-2069 <br /> LCS % Recovery 110°/. ,1 107% 107% 100% 107% 95 8% <br /> Surrogate Recovery 105% 102% 102% 102% 102% 102% <br />' Control Limits 70-130 % 70130 % 70-130 % 70-130 % 70-130 % 70-130 % <br />' MS/MSD Batch # VW-2069 VW 2069 VW-2069 VW-2069 VW-2069 VW-2069 <br /> MS % Recovery 128% 108% 101% 103% 112% 106% <br /> ISurrogate Recovery 111% 108% 108% 108% 108% 708% <br /> MSD % Recovery 107% 130% 992% 103% 111% 98 1% <br /> Surrogate Recovery 105% 102% 102% 102% 102% 102% <br /> Relative % Difference 17 5% 188% 144% 0 587% 1 15% 764% <br /> I Methanol Blank ND ND ND ND NDND <br /> Surrogate Recovery 95 9% 95 9% 95 9% 959% 95 9% 95 9% <br /> I <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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> I <br />' ANALYST �Td'u <br /> APPROVED BY <br /> Carr J Cone a es r rps <br /> Environmental Lab Director <br />