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COLUMBIA ANALYTICAL SERVICES, INC <br /> QA/QC Report <br /> Client \RCO Products Companv <br /> P[olect '169STOCKTON/208115-I 16 OlnITO#20682 pU Service Requevt. S9700307 <br /> Sample Matt a% Air Datc Collected: 2/20/97 <br /> Date Received. 2121197 <br /> Date Extra ted- NIA <br /> Date Analyzed. 2121197 <br /> Duplicate Summary <br /> BTEC and Total Volatile Hydrocarbons <br /> Units uL/L (ppmv) <br /> Sample Namc B itch QC <br /> Lab Code '397(1',0()-()()1 D <br /> Duplicate Rcl.itrvc <br /> Sample Sample Percent <br /> Analyte MRL Result Result Average Difference <br /> Benzene o 2 <0 8 CI <0 8 C1 <br /> Toluene U 1 3 5 2 9 3 2 <br /> Ethylbenzeric 19 <br /> til S1 44 48 15 <br /> Xylenes Total U 2 65 60 63 <br /> Total Volatile H%drocarbons 8 <br /> Cl -05 5 39 37 38 <br /> CG - C12 5 <br /> 460 420 440 9 <br /> TPH as Gasoline 5 460 420 440 <br /> 9 <br /> Mctlnl lent-BuINI E ificr 14 <3 C1 <3 Cl -- <br /> Note 1)1)1"V = Ineinl; s 124 45 (gas constant)/ molecular Height (MW)] <br /> VW Bcnienc. = 78 Tolucne= X12 Etlivlbenzene= 106 Total Xvlenes= 106 <br /> 1111' Gasollilc = 100 <br /> * FPH as L;asolmc is defined as C6 (benzene) through C12 (dodecane) and uses a <br /> nloicuilar %NCIght 01 It1() to calculate the ppmv <br /> Cl The MRL Nia,,efcN tiled due to h1f-111 mialvte concentration requiring sample dilution <br /> 11171'I UOb01� <br /> Page 8 <br />