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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 ID:Olivarez Property-Stockton Method:EPA 5030/8015M,8020 8442 Story Ridge Way Lab Reference Number: 1106023 Instrument ID:HP-GC1 Antelope,CA 95843 Sample Description:Water Extracted:06-07-11 Attn:Mike Vlach Analyst: Jim Phillips Analyzed:06-07-11 Reported:06-13-11 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: ug/L ug/L ug/L ug/L ug/L ug/L LCS Batch VW-6071 VW-6071 VW-6071 VW-6071 VW-6071 VW-6071 LCS%Recovery: 105% 113% 126% 108% 116% 114% Surrogate Recovery: 102% 89.8% 89.8% 89,8% 89,8% 89,8010 Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MS/MSD Batch#: VW-6071 VW-6071 VW-6071 VW-6071 VW-6071 VW-6071 Spike Concentration: 193 6.48 2,44 18.1 3.86 201 MS%Recovery: 88.2% 102% 123% 108% 113% 112% Surrogate Recovery: 105% 94.0% 94.0010 94.0% 94.0% 94,0010 MSD%Recovery: 92.6% 102% 125% 113% 116% 117% Surrogate Recovery; 105% 96.3% 96.3% 963010 96,3% 96.3% Relative%Difference: 4,20% 0.120% 1.50% 4.45% 2,16% 4.20% Method Blank: ND ND ND ND ND ND Surrogate Recovery: 96.8% 863% 86,7% 86.7% 86,7010 86.7% 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 the samples- The LCS%recovery is used for validation of sample batch results. Due to matrix effects,the QC limits and recoveries for MSMSD's are advisory only and are not used to accept or reject batch results. APPROVED BY: Jame,e Millips/La'bora(ory 61toctor or Cla r J Cone/Laboratory Manager