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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360 Winton, CA 95388 Phone 12091 384-2930 <br /> Certificate No 2079 Fax 12091 384-1507 <br /> Advanced Geo Environmental, Inc Client Project 1D Cal Fuels Method TPH Diesel <br /> of Northern California Reference Number 975 Instrument ID HP GC1 <br /> 1803 West March Lane Suite A Matrix Water Prepared 12 31 96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 1 2-97 <br /> Attn Tim Cuellar Reported 1 7 97 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH Diesel <br /> Spike Concentration 250 <br /> Units ug/L <br /> LCS Batch # TPHDW D316 <br /> LCSA % Recovery 80 9% <br /> Surrogate %Recovery 91 1% <br /> LCSB % Recovery 908% <br /> Surrogate %Recovery 101% <br /> Control Limits 55 130 °/a <br /> Relative % Difference 11 6% <br /> MS/MSD Batch # See note <br /> MS % Recovery See note <br /> MSD % Recovery See note <br /> Relative % Diffeience See note <br /> Note Insufficient sample material to prepare MSIMSD samples LCS samples prepared in duplicate <br /> The LC'S rLabci,a*ory CkecL- Sampler is a con"Ot sa^n;le Of 1^0 a fe a^' free •ha* 's fc—fled ^^'h ep ese^,a, a 2^e1,•es a^d <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 QC limits and recoveries for MSIMSD s are advisory only and are not used to accept or <br />' reject batch results <br /> ANALYST APPROVED BY <br /> rJL1 <br /> Clair J Cone J e C Phillips <br /> Environmental Lab,arrector <br />