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CASE NARRATIVE Gb Curtis &Tompkins,Ltd. <br /> , <br /> Laboratory number: 201865 , <br /> Client : URS Corporation <br /> Project : 18600251 <br /> Location: CARNG STKTN AASF ' <br /> Request Date : 03/12/06 <br /> Samples Received: 03/12/08 <br /> This hardcopy data package contains sample and QC results for four soil , <br /> samples and one water sample, requested for the above referenced project on <br /> 03/12/08. The samples were received cold and intact. ' <br /> TPH-Purgeables and/or BTXB by GC (EPA 80158) Water <br /> High surrogate recoveries were observed for bromofluorobenzene (FID) and , <br /> trifluorotoluene (FID) in the MS/MSD for batch 136272, due to interference <br /> from coeluting hydrocarbon peaks; the parent sample was not a project sample. <br /> No other analytical problems were encountered. ' <br /> TPH-Purgeables and/or BTXE by GC (EPA 8015B) Soil <br /> Low recovery was observed for gasoline C7-C12 in the MS for batch 136270; the <br /> parent sample was not a project sample, and the LCS was within limits. High ' <br /> recovery was also observed for gasoline C7-C12 in the MSD for batch 136270; <br /> the LCS was within limits, and this analyte was not detected at or above the <br /> RL in the associated samples. High RPD was also observed for gasoline C7-C12 ' <br /> in the MS/MSD for batch 136270; this analyte was not detected at or above the <br /> RL in the associated samples. High surrogate recovery was observed for <br /> trifluorotoluene (FID) in the MS for batch 136270, due to interference from <br /> coeluting hydrocarbon peaks; the parent sample was not a project sample. High , <br /> surrogate recoveries were observed for bromofluorobenzene (FID) in the MS/MSD <br /> for batch 136270, due to interference from coeluting hydrocarbon peaks; the <br /> parent sample was not a project sample. No other analytical problems were ' <br /> encountered. <br /> Volatile Organics by GC/MS (EPA 8260B) Water , <br /> No analytical problems were encountered. <br /> Volatile Organics by GC/MS (EPA 8260B) Soil <br /> High surrogate recovery was observed for dibromofluoromethane in B13-20-FD , <br /> (lab # 201865-005) ; no target analytes were detected in the sample. High <br /> surrogate recoveries were observed for bromofluorobenzene in 813-20-FD (lab # <br /> 201865-005) and the method blank for batch 135917; no target analytes were , <br /> detected in these samples. No other analytical problems were encountered. <br /> Metals (EPA 6010B) Water: <br /> No analytical problems were encountered. , <br /> Metals (EPA 6010B) Soil: <br /> No analytical problems were encountered. 1 <br /> Page 1 of 1 <br /> 291 <br /> 1 <br />