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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone (209)384-2930 <br /> ' Certificate No 2480 Fax (209)384-1507 <br /> Advanced GeoE=nvironmental, Inc Client Protect ID Rainwater Car Wash Method TPH-Diesel <br /> ' of Northern California Reference Number 4756 Instrument ID HP-GC1 <br /> 837 Shaw Road Matrix Water Prepared 06-07-02 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 06-10-02 <br /> Aitn Tim Cuellar 4 Reported 06-17-02 <br /> QUALITY CONTROL DATA REPORT <br /> 1 <br /> ANALYTE TPH-Diesel <br /> ' Spoke Concentration 250 <br /> ' Units ug/L <br /> LCS Batch# TPHDW-6072 <br /> ' LCSA%Recovery 844% <br /> LCSB%Recovery 728% <br /> ' Control Limits 55-130% <br /> Relative%Difference 147% <br /> ' MSIMSD Batch# TPHDW-6072 <br /> MS%Recovery See Note <br /> ' MSD%Recovery See Note <br /> Relative%Difference See Note <br /> 1 <br /> ' Note Insufficient sample material to prepare MSIMSD 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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 0' ANALYST APPROVED BY i <br /> i Clan J Cone JaM96 C,PM11ps <br /> La story Director <br /> f I , <br /> II ' ` <br />