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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br />' Certificate No 2079 Fax {209} 384-1507 <br /> Advanced Geo Environmental, Inc Client Project ID Nomellmi Construction Method TPH Diesel <br />' of Northern California Reference Number 1029 Instrument lD HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 3-5-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 3 7-97 <br /> Attn Tim Cuellar Reported 3-9 97 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br />' Spike Concentration 250 <br />' Units ug/L <br /> LCS Batch # TPHDW 3057 <br />' LCSA % Recovery 90 1% <br /> LCSB % Recovery 89 Try, <br /> Control Limits 55-130 % <br /> Relative % Difference 0464% <br /> MS/MSD Batch # See note <br /> MS 9'o Recovery See note <br /> MSD % Recovery See note <br /> Relative % Difference See note <br /> Relative % Difference See note <br /> Note Insufficient sample material to prepare MS/MSD i samples samples LCS prepared p p p p n 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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> refect batch results <br /> ANALYST APPROVED BY <br /> Carr J Cone J es C Phrl rps <br /> Environmental Lab Director <br /> I <br />