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I <br /> CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (2091 384 2930 <br /> Certificate No 2079 Fax (2091 384 1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Cal Fuel's Method TPH-Diesel <br />' of Northern California Reference Number 1405 Instrument ID HP-GC1 <br /> 1803 West March Lane Suite A Matrix Water Prepared 1-16-98 <br /> Stockton CA 95207 Analyst Jim Phillips Analyzed 1-19 98 <br /> Attn Tim Cuellar Reported 1-20-98 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spike Concentration 250 <br />' Units ug/L <br /> LCS Batch # TPHDW 1168 <br /> LCSA % Recovery 780% <br /> LCSB % Recovery 77 6% <br />�i Control Limits 56 130 % <br /> Relative % Difference 0 599% <br /> MSIMSD Batch # TPHDW 1168 <br /> MS % Recovery NA <br /> MSD % Recovery NA <br /> Relative % Difference NA <br /> Note Insufficient sample material to prepare MSIMSD samples LCS samples prepared in duplicate <br /> I he LCS (Laboratory Check bample) is a control sample of known, interferent tree matrix that is tortitied with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS % recovery is used for validation <br /> I of sample batch results Due to matrix effects, the QC limits and recoveries for MS/MSD s are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST " APPROVED BY <br /> I Clair J Cone J es aCPhimps <br /> aomntnvrrnl <br /> Lab Director <br />