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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 <br /> Certificate No.2480 Fax: (209)384-1507 <br /> Foothill Engineering Client Project Name:Olivarez Property-Stockton Method:EPA 5030/8260B <br /> 8442 Story Ridge Way Lab Reference Number: 1203108 Instrument ID:VARIAN MS <br /> Antelope,CA 95843 Sample Description:Water Prepared: 03-27-12 <br /> Attn:Mike Mach Analyst: Clan Cone Analyzed: 03-27-12 <br /> Reported: 04-04-12 <br /> QUALITY CONTROL DATA REPORT <br /> VWMS-3272b <br /> Reporting BLANK -'Spiking ---Co-ntrol %R <br /> Limit Result Level Spike Limits <br /> pgrL Pqd- pg/L %R <br /> COMPOUNDS <br /> t-Butyl Alcohol(t-BA) 20 ND 75 85,4% _ 27.2-178A <br /> Methyl t-butyl ether (MTBE) 0,50 NO 2.5 122% 59,7-153.0 <br /> Diisopropyl ether(DIPS) 0.50 NO 2.5 129% 72.1-129.6 <br /> Ethyl t-Butyl ether(ETBE) 0,60 NO 2.5 122% 88.1-130.8 <br /> t-Amyl methyl ether(TAME) -6-.-50 NO 2.5 119% 602-137.1 <br /> 1,2-Dichloroethane(1,2-DCA) 0.50 ND 2.5 128% 912-137.6 <br /> Eth Iene dibromide{EDB 0.50 NO 2,5 123% 69.5-128.9 <br /> 1,2-Dichloroethane-d4 1.0 102% 10 94,3010 813-125.4 <br /> !Toluene-d8 1.0 92,5% 10 95.3% 1 Dj-112.6_J <br /> Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> -29LL- %R %R <br /> COMPOUNDS 1 -1-51.2 -373% <br /> t-Butyl Alcohol(t-BA) 75 84.4% 87.7% <br /> Methyl t-butyl ether (MTBE) 2.5 102% 119% 70.9-144.1 7.28% <br /> Diisopropyl ether{DIPS) 2.5 99,2010 112% 73.6-126.5 11.6% <br /> Eth I t-Butyl ether(ETBE) 2.5 94,4010 107% 74.8-128.1 12.3% <br /> t-Amyl methyl ether(TAME) 2.5 96.0% 106% 62.5-118.6 10,3010 <br /> 1,2-Dichloroethane I1,2-DCA) 2,5 90.4% --1-52% -85 A-144.6 13,3010 <br /> Ethylene dibromide(EDB) 2.5 100% -3% 733-125.1 12.2% <br /> Surrogate: <br /> 1,2-Dichloroethane-d4 10 98.5% 99,4% 80,2-126,9 0.910010 <br /> Toluene-d8 10 96.6010 100% i 82.6-111-9_J_:::3:=459-/- <br /> The LCS(Laboratory Check Sample)is a control%amnle of known,interferent free matrix that is fortified with representative analytes 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 /> reject batch results. <br /> APPROVED BY: <br /> James C.Phillips/La ratory Director or <br /> Clari J.Cone/Laber oty Manager <br /> 81 of 82 <br />