种树挖坑前先打电话--了解地下管道线路分布
安省 one call before dig.
免费电话：1-800-400-2255
网址：http://on1call.com/ 可以网上填写申请。
ntario One Call or ON1Call, is a Not-For-Profit corporation formed in 1996 toestablish a call centre to receive excavator locate requests within theProvince of Ontario and to notify the members with underground facilities inthe vicinity of the dig site.
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