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CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 Certificate#2480 Fax: (209)3841507 Foothill Engineering Client Project Number:2064 Method:EPA 503018015M,8020 8442 Story Ridge Way Client Project Name:Vogue Cleaners-Stockton Instrument ID:HP-GC1 Antelope,CA 95843 Lab Reference Number:1110095 Extracted:10-24-11 Attn:Mike Vlach Sample Description;Water Analyzed: 10-24-11 Analyst: Jim Phillips Reported: 10-28-11 QUALITY CONTROL_DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 193 6.48 2.44 18.1 3.86 201 Units: uglL ug/L ug/L ug/L uglL ug/L LCS Batch#: VW-0241 VW-0241 VW-0241 VW-0241 VW-0241 VW-0241 LCS%Recovery: 108% 114% 113% 102% 109% 106% Surrogate Recovery: 104% 98.9% 98.9% 98.9% 98.9% 98.9% Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MSIMSD Batch#: VW-0241 VW-0241 VW-0241 VW-0241 VW-0241 VW-0241 Spike Concentration: 193 6.48 2.44 18.1 3.86 20.1 MS%Recovery: 97.8% 113% 111% 104% 104% 111% Surrogate Recovery: 84.1% 95.7% 95.7% 95.7% 95.7% 95.7% MSD%Recovery: 98.B% 107% 99.1% 92.7% 101% 110% Surrogate Recovery: 99.9% 107% 107% 107% 107% 107% Relative%Difference: 0.946% 5.08% 11.3% 11.7% 2.55%a 0,966%n Method Blank: ND NO NO NO NO NO Surrogate Recovery: 93.9% 93.7% 93.7% 93.7% 93.7% 93.7% The LCS(Laboratory.Check Sample)is a control sample of known,Interferent free,matrix that is fortified with representative analytes and analyzed using the same reagents,preparation and analytical methods employed for he samples. The LCS%recovery is used for validation of sample batch results. Due to matrix effects,the QC limits and recoveries for MS/ SD's are advisory only and are not used to accept or reject batch results. APPROVER BY: Jardost. PhilfipslLaborkoryDirectoror ar!J. Cone/Laboratory Manager