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ii 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 Name:Olivarez Property-Stockton Method:EPA 5030/8015M,8020 8442 Story Ridge Way Lab Reference Number:1203108 Instrument ID:HP-GC1 Antelope,CA 95843 Sample Description:Water Extracted:04-03-12 Attn:Mike Vlach Analyst: Jim Phillips Analyzed:04-03-12 Reported:04-04-12 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 193 6.48 2,44 18,1 3.86 20.1 Units: ug/L ug/L ug/L ug/L ugit- ug/L LOS Batch#: VW-4032 VW-4032 VW-4032 VW-4032 VW-4032 VW-4032 LCS%Recovery: 104% 910% 100010 96.8% 106% 99.8010 Surrogate Recovery: 108% 105% 105% 105010 105% 105% Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MS/MSD Batch#: VW-4032 VW-4032 VW-4032 VW-4032 VW-4032 VW-4032 Spike Concentration: 193 6.48 2,44 18.1 3.86 20.1 MS%Recovery: 94.8% 903010 105010 99.5010 108% 102% Surrogate Recovery: 106% 107% 107% 107% 107% 107% MSD%Recovery: 93.201a 87.2% 96.6% 94.3010 101% 95.7010 Surrogate Recovery: 104% 103% 103% 103010 103010 103010 Relative%Difference: 1,60% 3,85% 7.8801a 5.38% 6.32010 5.87% Method Blank: ND ND ND ND ND ND Surrogate Recovery: 96.2% 102010 102% 102% 102% 102% 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 1%recovery is used for validation 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 reject batch results, APPROVED BY: Jam C.Phillip Laboratory Director or Clad Phillip Manager 77of82