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CbCurtis&Tompkins.Lid. <br /> CASE NARRATIVE <br /> Laboratory number: 253472 <br /> Client : URS Corporation <br /> Project: 17327022 , <br /> Location: DVI-Burn Pit <br /> Request Date: 02/18/14 <br /> Samples Received: 02/18/14 <br /> This data package contains sample and QC results for six water samples, <br /> requested for the above referenced project on 02/18/14. The samples were ' <br /> received cold and intact. <br /> Volatile Organics by GC/MS (EPA 8260B) : <br /> No analytical problems were encountered. <br /> Metals (EPA 60108 and EPA 7470A) : ' <br /> No analytical problems were encountered. <br /> Ion Chromatography (EPA 300.0) : <br /> MW-2-BP (lab # 253472-001) and MW-24-BP (lab # 253472-005) were diluted due , <br /> to high sulfate concentrations. No other analytical problems were encountered. <br /> Hexavalent Chromium by Ion Chromatograph (EPA 7199) : t <br /> No analytical problems were encountered. <br /> Alkalinity (SM2320B) : <br /> No analytical problems were encountered. ' <br /> Total Organic Carbon (TOC) (SM5310C) : <br /> No analytical problems were encountered. ' <br /> Silica (SM4500SI02-C) water: <br /> High recoveries were observed for silica in the MS/MSD of MW-2-BP (lab # ' <br /> 253472-001) ; the LCS was within limits, and the associated RPD was within <br /> limits. Silica was detected above the RL in the method blank for batch <br /> 208333; this analyte was not detected in samples at or above the RL. No other <br /> analytical problems were encountered. ' <br /> Silica (SM4500SI02-C) Filtrate: <br /> High recoveries were observed for silica in the MS/MSD of MW-2-BP (lab # ' <br /> 253472-001) ; the LCS was within limits, and the associated RPD was within <br /> limits. No other analytical problems were encountered. <br /> Dissolved CO2 by GC TCD (RSR-175) : ' <br /> Cal Science in Garden Grove, CA performed the analysis (NELAP certified) . <br /> Please see the Cal Science case narrative. <br /> Page 1 of 1 , <br /> 43.0 <br /> � AfI <br />