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CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater,CA 95301 Phone: (209)384-2930 Certificate#2480 Fax: (209)384=1507 Foothill Engineering Client Project Number:2064 Method:EPA 5030/8015M,8020 8442 Story Ridge Way Client Project Name:Vogue Cleaners-Stockton instrument ID:HP-GC1 Antelope,CA 95843 Lnh Reference Number: 1110095 Extracted: 10-25-11 Attn:Michael Vlach Matrix:Soil Analyzed: 10-25-11 Analyst: Clari Cone Reported:10-28-11 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 3.87 129.5 48.8 362 77.1 402 Units: mglkg ug/kg ug/kg ug/kg uglkg ug/kg LCS Batch#: VS-0251 VS-0251 VS-0251 VS-0251 VS-0251 VS-0251 LCS %Recovery: 84.8% 82.0% 85.0% 82.1% 83.2% 85.1% Surrogate Recovery: 115% 105% 105% 105% 106% 105% Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MSIMSD Batch#: VS-0251 VS-0251 VS-0251 VS-0251 VS-0251 VS-0251 MS%Recovery: 66.9% 69.0% 70.2% 71.4% 70.5% 73.2% Surrogate Recovery: 98.1% 89.5% 89.5% 89.5% 89.5% 89.5% MSD%Recovery: 63.4% 66.0% 61.8% 63.5% 67.2% 68.0% Surrogate Recovery: 96.1% 86.6% 86.6% 86.6% 86.6% 86.6% Relative%Difference: 5.15% 4.46% 12.5% 11.7% 4.90% 7.33% Methanol Blank: ND ND ND ND ND ND Surrogate Recovery: 104% 110° 110% 110% 110% 110% Please Note: 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 the samples. The LCS%recovery is used for validation Of sample batch results. Due to matrix effects,the QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or, reject batch results. r.. APPROVED BY: Ja a hillips/Lab ratory Director or ori J. Cone/Laboratory Manager