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�} CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone {2091 384-2930 <br /> Certificate No 2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method TPH-Diesel <br /> of Northern California Reference Number 1193 Instrument ID HP GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 7-23 97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 7 2497 <br /> Attn Tim Cuellar Reported 7-28-97 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br /> 1 <br /> Spike Concentration 250 <br />' Units ug/L <br /> LCS Batch # TPHDW-7237 <br /> LCSA % Recovery 81 9% <br /> LCS$ % Recovery 87 1% <br /> Control Limits 55-130 % <br /> Relative % Difference 608% <br /> MS/MSD Batch # See note <br /> MS % Recovery See note <br /> MSD % Recovery See note <br /> Relative % Difference See note <br /> Note 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 /> 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 MS/MSD s are advisory only and are not used to accept or <br /> reject batch results <br /> (::::;�,r olt <br /> ANALYST �v` APPROVED BY <br /> CI J Cone J es C Phillips <br /> 13r- Lab Director <br />