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r CASTLE ANALYTICAL LABORATORY <br /> 11Wnvironmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone {209} 384-2930 <br /> Certificate No 2079 Fax (209) 384-1507 <br /> Advanced Geo Environmental Inc Client Project ID Cal Fuels Method TPH Diesel <br /> of Northern California Reference Number 2250 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 5-6-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 5-7-99 <br /> Attn Tim Cuellar Reported 5-18 99 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> Units uglL <br /> LCS Batch # TPHDW 5069 <br /> LCSA % Recovery 65 1% <br /> LCSB % Recovery 882% <br /> •Control Limits 55-130 <br /> Relative % Difference 302% <br /> MS/MSD Batch # TPHDW 5069 <br /> MS % Recovery See Note <br />' MSD % Recovery See Note <br /> Relative % Difference See Note <br /> I <br /> INote Insufficient sample material to prepare MS/MSD samples LCS samples prepared in duplicate <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, preparaVon 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 /> refect batch results <br /> ANALYST APPROVED BY <br /> t <br /> Clan J Cone James hrltrps <br /> -Ironmental Lab Director <br />