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1 <br /> 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 GeoEnvironmental, Inc Client Protect ID 95-0132 Method TPH-Diesel <br /> of Northern California Reference Number 688 Instrument ID HP-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 3-7 96 <br /> Stockton, CA 95207 Analyst Clan Cone Analyzed 3-8 96 <br />' Attn Kevin McKibben Reported 3-11-96 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE TPM-Diesel <br /> Spike Concentration 250 <br />' Units ug/L <br /> LCS Batch # TPHDW-3076 <br />' LCSA % Recovery 820% <br /> LCSB % Recovery NA" <br /> Control Limits 55-130 % <br /> Relative % Difference NA" <br /> MSIMSD Batch # See note <br /> MS % Recovery See note <br /> MSD % Recovery See note <br /> Relative % Difference See note <br /> " LCSB- Lost during extraction <br /> Note Insufficient sample material to prepare MS/MSD samples LCS samples prepared in duplicate <br /> Please Note <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 /> ANALYST Z APPROVED BY <br /> Clan J Cone ;meZsC Phrlh <br /> Environmental Lab Director <br />