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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater CA 95301 Phone (209)384-2930 <br /> ' Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Rainwater Car Wash Method EPA 5030l8015M,8020 <br /> ' of Northern California Reference Number 4756 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 06-09-02 <br /> Stockton,CA 95215 Analyst Jim Phillips Analyzed 06-09-02 <br /> Attn Tim Cuellar Reported 06-17-02 <br /> 1 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 10 1 32 714 114 122 <br /> ' Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# VW-6092 VW-6092 VW-6092 VW-6092 VW-6092 VW-6092 <br /> LCS%Recovery 113% 903% 963% 913% 917% 957% <br /> Surrogate Recovery 103% 123% 123% 123% 123% 123% <br /> ' Control Limas 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> ' MS/MSD Batch# VW-6092 VW-6092 VW-6092 VW-6092 VW-6092 VW-6092 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br /> MS %Recovery 944% 107% 997% 876% 885% 878% <br /> Surrogate Recovery 102% 105% 105% 105% 105% 105% <br /> MSD%Recovery 994% 125% 993% 897% 924% 907% <br /> ' Surrogate Recovery 102% 103% 103% 103% 103% 103% <br /> Relative%Difference 481% 154% 0427% 235% 4 21% 309% <br /> ' Methanol Blank ND ND ND NO ND NO <br /> Surrogate Recovery 107% 105% 105% 105% 105% 105% <br /> ' The LCS(Laboratory Check Sample)is a control sample of known interferent free matrix that is fortified with representative anal t <br /> es 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 /> refect batch results <br /> o/ANALYST APPROVED BY <br /> Clan J Cone i Ja es ilkps <br /> baratory Director <br /> i <br /> � i <br />