Groundwater is conveyed to a community from a well field through a 16-in.-diameter pipeline 4200 ft in length. The peak hourly pumping rate is 2000 gpm, and the water temperature is 5°C. Because of the location, the supply has been designated as vulnerable to fecal contamination, and the state has specified a minimum disinfection level of 99.9 percent (3.0 log) virus inactivation. What free chlorine residual is required in the water at the outlet of the pipeline?
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