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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 GeoEnvironmental, Inc Client Project ID Cal Fuel s Method TPH-Diesel <br />' of Northern California Reference Number 1293 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 10-23-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 10-23-97 <br />' Attn Tim Cuellar Reported 10 27-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> r <br /> Spike Concentration 250 <br /> Units uglL <br /> LCS Batch # TPHDW 0237 <br /> LCSA % Recovery 702% <br /> LCSB % Recovery 746% <br />'* Control Limits 55-130 % <br /> Relative % Difference 604% <br /> MSlMSD Batch # TPHDW 0237 <br /> MS % Recovery NA <br /> MSD % Recovery NA <br /> Relative % Difference NA <br /> INote Insufficient sample material to prepare MSlMSD samples LCS samples prepared in duplicate <br /> The I CS (!_abC!ra*ory ChPC4 Sarr ple) ,c a Cnntrei Sample o; 1-0.r.. —erferent 4,ee 'ra+nx*Hat 'v s-,r.f cd f,th raprasentative a„alytcs and <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 flue 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 B;n,,rnm,7t.1'PLsb <br /> Clair J Cone r <br /> Director <br />