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1. An orchard worker sues his employer for not providing protective measures against exposure to DDT used in the orchard. a. Calculate the chronic daily intake of DDT for an adult from exposure at a level of 9 ppb for 40 hours a week over 30 years. b. Calculate the cancer risk sustained by the worker using the slope factor from Davis and Masten.
2. The SO2 emission from a fixed source is 25 g/s. The effective stack height is 60 m, the wind speed is 4 m/s at the top of the stack. Assuming class C stability, what is the expected ground level concentration 2 km downwind?
3. A sanitary landfill is being designed to handle solid waste at a rate of 75 Mg per day. It is expected that the waste will be delivered 5 days a week. The density as spread is 135 kg per m3. It will be spread in 0.5 m layers and compacted to 0.25 m. Assuming two lifts a day and a daily cover of 0.10 meters, determine the annual volume of landfill consumed in cubic meters and the daily horizontal area covered by the solid waste. Ignore the soil volume between stacks.
4. Ferric chloride (FeCl3·7H2O) is used at a water treatment plant. The FeCl3·7H2O is dosed at 40 mg/L. The flow rate of the treatment plant is 2,000 m3/d. a. Calculate the mass of sodium bicarbonate (NaHCO3) that would be required per day to replace the alkalinity consumed. (Hint: NaHCO3 dissociates to Na+ and HCO3 -) b. Calculate the total mass of sludge dry solids generated per day.
The beams support one-way slabs, 6 inches thick that span 20 feet center to center. Assume that the beams are 16 inches wide and 24 inches deep. Determine the dead load in pounds per linear foot for the beams, from the concrete structure alone.
A force, 90 N in magnitude, is applied to control rod AB as shown. Knowing that the length of the rod is 225 mm, determine the moment of the force about point B by resolving the force into components along AB and in a direction perpendicular to AB..
The solid silver chloride is placed in water. It reaches equilibrium and has a solubility product constant of 1.8 x 10-10. What is the concentration of silver if the chloride concentration is raised to 3M
A trapezoidal channel of bottom width 25ft and side slope 1:2.5 carries a discharge of 450cfs with a normal depth of 3.5 ft. The elevations at the beginning and end of the channel are 685 and 650 ft, respectively.
A 40 oF breeze of 10 miles per hour blows over the top of a round open-top water cooling tank which has a bulk temperature of 100 oF. What is the rate of energy in kW that enters into the air
Nairobi has a birth rate of 3.3 individuals per individual per year and a death rate of 3.2 individuals per individual per year. If the carrying capacity were 105, what would the population be in 25 years
An undisturbed soil sample was collected in a sampling tube of internal diameter 5cm. The length of the extracted sample was 10.2 cm and its mass was 360 g. After oven drying the mass reduced to 326.5 g.
Determine the estimated width of flexural cracks that will occur in the 8" (total depth) one-way slab shown in the figure below. Assume bottom clear cover is3/4". is the crack width permissible assuming the exposure is dry air
The concentration of trichloroethelyne (TCE) in an air sample near a hazardous waste landfill is 34 ppm, the ambient air temperature is 31 degrees C, and the atmospheric pressure is 0.94 atm. What is the TCE concentration in mg/m^3
Determine the diameter of glass tubing that is necessary for the capillary rise to be less than 0.5 mm. Assume the fluid is water with surface tension equal to 0.0728 N/m and specific weight equal to 9800 N/m3
two steel spheres 100mm in diameter. Compute gravitational force and the force of mutual attraction F in newtons. the specific weight of steel is 0.284 lb/in^3
The effective angle of friction (phi) was found to be 26 degrees for a normally consolidated soil. If the soil is tested in consolidated drained triaxial test under sigma3 = 60 kPa, what would be the failure deviatoric stress sigma1-sigma3 stress
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