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The drinking water standard for tetrachloroethylene is 0.005 mg/L. Using EPA exposure factors for residential consumption, what lifetime risk would this pose? What concentration would correspond to a risk of 10-6? The following data and assumptions apply: Data or Assumption Value Cancer Slope Factor = 5.16 x 10^-2 (mg/Kg x day)^-1 Average Body Weight = 70 Kg Average Lifespan = 70 Years Average Daily Water Intake = 2 L/day Average Time in One House = 30 Years Absorption Factor = 1.0
The state highway department is considering six routes for a new highway. Listed below are the estimated construction costs, maintenance costs, and the user cost associated with each route.
Establish a grass cover over a 10ha landfill. The root zone of the grass is 40cm deep. Increase the volumetric water content of root zone from 12% to 24%. How many cubic meters of water are needed?
A force is specified by the vector F= 120i-160j+80k lb. Calculate the angles made by F with the positive x-,y-, and z- axes.
A chemical mixing basin is to be designed to blend chlorine and treated wastewater. The basin flow is 700 gallons per minute and the basin dimensions are 5 feet by 5 feet by 5 feet water depth.
The thermal efficiency of an aircraft gas turbine engine (turbojet, based on ideal Brayton cycle) is 25%. The aircraft travels at a speed 770 km/h at an altitude 6800 m above sea level (standard atmospheric air). The combustion chamber outlet temp..
For each of the following, draw both the p - v and the T - v diagrams showing the location of the state and write below the diagrams a) what the condition the H2O is in (eg. Superheated vapor), b) which table in the back of the text provides the e..
If the resultant force of the two tugboats is 2.2kN , directed along the positive x axis, determine the required magnitude of force Fb. Determine the direction theta of force Fb
A wastewater treatment plant has a flow of 30 mgd. The influent BOD is 250 mg/L. Assume that 30% of the BOD is removed in the primary clarifiers. The plant is designed to carry 3,000 mg/L of VSS in the aeration basin.
For a cement paste with an initial water-cement ratio of 0.5, by mass, calculate the mass and volumetric composition of 1 cm^3 of HCP under both wet and sealed curing conditions.
List five soil and water management strategies appropriate for agricultural use of ultisols. 100-150 word limit.
An electronic chip internally generates 1.5 Watts of heat energy that must be dissipated to ensure its reliable operation. A fan, with an exposed area of 10cm^2 is attached to the chip so the heat can be transferred away by convection.
Determine the required pumping rate. the aquifer has T= 1600 m2/day and the wells each have radius of influence of 600m.
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