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1 <br />' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Dave Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate No 2079 Fax (209) 384-1507 <br />' Advanced GeoEnvironmental, Inc Client Project ID Nomellini Method TPH-Diesel <br /> of Northern California Reference Number 1228, 1230 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 8-18-97 <br />' Stockton, CA 95207 Analyst Jim Phillips Analyzed 8-19-97 <br /> Attn Tim Cuellar Reported 8-22-97 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE TPH Diesel <br />' Spike Concentration 250 <br /> Units uglL <br />' LCS Batch # TPHDW 8187 <br /> LCSA % Recovery 79 5% <br /> LCSB % Recovery 606% <br /> Control Limits 55-130 % <br />' Relative % Difference 27 0% <br />' MS/MSD Batch # See note <br /> MS % Recovery See note <br /> I MSD % Recovery See note <br /> Relative % Difference See note <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 /> 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 MSIMSD's are advisory only and are not used to accept or <br /> refect batch results <br /> 1 <br /> ANALYST APPROVED BY <br /> Clarr Cone J es C Phillips <br /> rnvrronmental Lab Director <br />