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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 1326 instrument ID HP-GC1 <br /> 4005 North wdson Way Matrix Water Prepared 11-17-97 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 11-18-97 <br /> IAnn Tim Cuellar Reported 11-20-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH Diesel <br /> Spike Concentration 250 <br /> Units ug/L <br /> LCS Batch # TPHDW N177 <br /> LCSA % Recovery 78 7% <br /> LCSB % Recovery 85 1% <br /> Control Limits 55-130 % <br /> Relative % Difference 774% <br />! MS/MSD Batch # See Note <br /> MS % Recovery <br /> i <br /> MSD % Recovery <br /> Relative % Difference <br /> Note Insufficient sample material to prepare MS/MSD samples LCS samples prepared in duplicate <br /> The I rvv 11ah.Cra+.^.r� f ho�4 Q.—pial IS a Cnnfrnt garnnla of 4nnum, ,nterf—nt free matrix that 14 fnrtifieri with rPnresontative anaivtes 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 Due to matrix effects, the OC 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 /> Clan J Cane #fnes-'C Phdlrps <br /> Environmental Lab Director <br />