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I <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Sox 1360, Winton, CA 95388 Phone (209) 384-2930 <br />' Certificate No 2079 Fax (209) 384-1507 <br /> Advanced Geo Environmental, Inc Client Project ID Cal Fuels Method TPH-Diesel <br /> I of Northern California Reference Number 1078 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 4-11-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 4-15-97 <br /> Attn Tim Cuellar Reported 4-21-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br />' Spike Concentration 250 <br />' Units ug/L <br /> LCS Batch # TPHDW-4117 <br /> LCSA % Recovery 780% <br /> LCSB % Recovery 744% <br /> Control Limits 55-130 % <br /> Relative % Difference 465% <br /> MS/MSD Batch # See note <br /> MS % Recovery See note <br /> MSP % Recovery See note <br /> Relative % Difference See note <br /> Relative % Difference See note <br /> Note Insufficient sample material to prepare MS/MSD samples LCS samples prepared in duplicate <br /> T ne LCS {uaooratory CnecK Sample) is a controi sample of known, interferent tree matrix that is tortified 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 /> ANALYST �� APPROVED BY <br /> Clary J Cone Ja'76i hr rps <br /> vrronmental Lab Director <br />