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i <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate 112079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method TPH-Diesel <br /> of Northern California Reference Number 1378 Instrument ID HP-GC1 <br /> 4005 N Wilson Way Matrix Sod Prepared 12-29-97 <br /> Stockton CA 95205 Analyst Clan Cone Analyzed 12-29-97 <br /> Attn Tim Cuellar Reported 12-30-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TPH-Diesel <br /> Spoke Concentration 50 <br /> Units mglkg <br /> LCS Batch 11 TPHD-D297 <br /> LCS % Recovery 870% <br /> Control Limits 60 130 % <br /> MS/MSD Batch # TPHD-D297 <br /> MS % Recovery NA* <br /> MSD % Recovery NA <br /> Relative % Difference NA <br /> APercenr recoveries not calculated due to maurx rnterrerence <br /> Please Note <br /> The LCS (Laboratory Check Samplel 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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> ZL <br /> Clan J Cone Ja"';;eCL15tT111JPS <br /> vironmental Lab Director <br />