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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209) 384-2930 <br />' Certificate No 2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironment al, Inc Client Project ID Cal Fuels Method TPH-Diesel <br />' of Northern California Reference Number 2391 Instrument ID HP-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 8-3-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 8-8-99 <br /> Attn Tim Cuellar Reported 8-9-99 <br /> 1 <br /> ` QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br /> I Units ug/L <br /> LCS Batch # TPHDW-8039 <br />' LCSA % Recovery 71 4% <br /> LCSB % Recovery 794% <br /> 0Control Limits 55-130 % <br /> Relative % Difference 105% <br />' MS/MSD Batch # TPHDW-8039 <br /> MS % Recovery See Note <br /> MSD % Recovery See Note <br /> Relative % Difference See Note <br /> Note 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 frpp matrix that ig fortified with rP nese tatn-e a alyt s a—d <br /> _p .._..n .. r,. , e„ ,. <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 OC limits and recoveries for MS/MSD s are advisory only and are not used to accept or <br /> refect batch results <br /> ANALYST � � APPROVED BY <br /> Clan J Cone Ja <br /> Zs C rllrps <br /> nvrronmental Lab Director <br />