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Pollock Pines Drinking Water

  TBM-driven 3 km mountain tunnel between Mill Creek and Bull Creek just started by Traylor Bros. for the El Dorado Irrigation District. Drive end in June 2002. Expected rate of 152 metres per week. TBM equipped with seventeen cutters, 43 cm in diameter, by maker Construction and Tunneling Services (CTS). The cutterhead can produce more than one million pounds of thrust. 90% of the tunnel unsupported, 10% resin bolts and some 4WF13 ribs. Visit www.traylor.com and www.ctstbm.com 50/01.