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The drinking water standard for dioxin is 3 x 10-8 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 = 1.56 x 10^5 (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 concentration of Chemical Oxygen Demand (COD) in the effluent from this system is 25 mg L-1. The growth rate of the organisms in this case is 0.9 days-1. The activated sludge tank has a volume of 50 m3 and the flow rate through it is 500 m3 da..
A train starts from rest and travels 1 kilometer at uniform acceleration. The next 2 kilometers it travels at uniform speed. The train decelerates uniformly before coming to a rest. If the total time is 6 minutes, draw the v-t graph and determine the..
compute the max possible moment at the centerline of the beam and the absolute moment in the beam.
Design a concrete column of 14 ft high to support a dead load of 80 kips and a live load of 200 kips. f'c= 6,000 psi fy= 60,000 psi
Absolute value signs serve as a reminder that, at this point Td and Te must be expressed as absolute temperatures.
A semiautomated system has been developed as an alternative. The costs for the proposed method are $40,000 for equipment and $1.00 per manufacturing cost per unit. What is the break-even number of units per year
What is the probability that a drought is more severe than a drought of a return period of once in 50 yr will occur exactly twice in 100 yr
In the first couple steps you are using the sine function to derive that the interior triange BCG is a right triangle. However, the sine function, by definition, is opposite divided by hypotenuse. You used sine as opposite dividede by adjacent which ..
The dry density of a compacted sand is 1.87 Mg/m^3 and the density of the solids is 2.67 Mg/m^3. What is the water content of the material when saturated. Include a phase diagram.
a 31' solid circular bar of 2" diameter is fixed to a wall. it is made of aluminum of E=10*10^6. a 30" circular solid 1" diameter aluminum bar is welded to the 2" bar at a 30" centerline perpendicular relative to the other bar per the diagram.
if the density of the clay is equal to 2.0 Mg/m3 ,calculate the total vertical stress ,pore water pressure and effective vertical stress at a depth of 5 meters below ground level.
If the allowable shear stress is 100 MPa, calculate the maximum shear force V that a W460 X 60 structural steel wide flange is capable of resisting. Use the average web shear approach.
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