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cbCurtis & Tompkins, Ltd. <br />CASE NARRATIVE <br />Laboratory number: 218237 <br />Client: MWH <br />Project: 4050530.010101 <br />Location: Bridgestone/Rancho Cordova <br />Request Date: 02/10/10 <br />Samples Received: 02/10/10 <br />This data package contains sample and QC results for two metal shavings <br />samples, requested for the above referenced project on 02/10/10. The samples <br />were received intact. <br />Metals (EPA 6010B and EPA 7471A) Miscell.: <br />Low recovery was observed for selenium in the MSD for batch 159997; the <br />parent sample was not a project sample, and the associated RPD was within <br />limits. High recoveries were observed for chromium and antimony in the MS/MSD <br />for batch 159997. High RPD was observed for antimony; the RPD was acceptable <br />in the BS/BSD. No other analytical problems were encountered. <br />Metals (EPA 6010B and EPA 7470A) TCLP Leachate: <br />No analytical problems were encountered. <br />Page 1 of 1 <br />16.0 <br />2of17 <br />