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r <br /> Curtis&Tompkins.Ltd. <br /> CASE NARRATIVE <br /> Laboratory number: 227030 <br /> Client : URS Corporation <br /> Project: DVI-BP <br /> Location: DVI-Burn Pit - <br /> Request Date: 04/04/11 ' <br /> Samples Received: 04/04/11 <br /> This data package contains sample and QC results for six water samples, ' <br /> requested for the above referenced project on 04/04/11. The samples were <br /> received cold and intact. <br /> Volatile Organics by GC/MS (EPA 82608) : <br /> N-butylbenzene was detected above the RL in the method blank 'for batch <br /> 173410; this analyte was not detected in samples at or above the RL. No other <br /> analytical problems were encountered. <br /> Metals (EPA 6020 and EPA 7470A) Water: <br /> Low recovery was observed for barium in the MSD of MW-2-BP (lab # <br /> 227030-001) ; the BS/BSD were within limits, and the associated RPD was within <br /> limits. No other analytical problems were encountered. <br /> Metals (EPA 6020 and EPA 7470A) Filtrate: <br /> No analytical problems were encountered. <br /> Ion Chromatography (EPA 300.0) : <br /> MW-5-BP (lab # 227030-002) , MW-7-BP (lab # 227030-005) , and MW-24-BP (lab # <br /> 227030-006) were diluted due to high chloride concentrations. MW-2-BP (lab # <br /> 227030-001) and MW-25-BP (lab # 227030-007) were diluted due to high sulfate <br /> concentrations. No other analytical problems were encountered.. <br /> Hexavalent Chromium by Ion Chromatograph (EPA 7199) : , <br /> No analytical problems were encountered. ' <br /> Alkalinity (SM2320B) : <br /> No analytical problems were encountered. <br /> Total Dissolved Solids (TDS) (SM2540C) : <br /> No analytical problems were encountered. <br /> Total Organic Carbon (TOC) (3M5310C) : <br /> No analytical problems were encountered. <br /> Silica (SM4500SIO2-C) : <br /> No analytical problems were encountered. <br /> Page 1 of 1 <br /> se o , <br /> 2 of 69 ' <br />