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Consider a small town in the Phillippines, where the average weight of people is 55 kg, and the average lifespan is 60 years. The people here eat lots of fish due to abundant availability from the local river. The river bed contains 0.0685% Calcium Arsenite Ca3(AsO3)2. The local industries also discharge various salts of cadmium in the river; the concentration of cadmium in water is 30 ppb (parts per billion) and the BCF of cadmium is 1000 L/kg and that of As is 0.00. The potency factor of Arsenic and Cadmium are 17.5 and 56.4 (mg/k-day)^-1. The Ksp of Calcium Arsenite is 4.93 x 10^-15. Consider each person drinks 1.8 L of water per day and eats 75 g of fish per day, 5 days a week. Determine the lifetime risk of a resident.
It has been determined that the steady-state diffusion flux of a gas molecule through a solid metal plate is 5*10^-8 kg/m^2*s at a temperature of 1000K, and a concentration gradient of -300 kg/m^4.
Check that the nominal shear strength measurements are normally distributed and verify that there are no outliers in the sample data.
A time interval of 1.5 hours is recorded for a 6 inch drop of water level in a percolation (perc) test hole. What is the perc rate. How many laterals would be required in the leaching field to serve a 5 bedroom house,
The Big Bear town council has asked that you determine whether the discharge of the town's wastewater into the Salmon River will reduce the DO below the state standard of 5.00 mg/L at Little Bear, 5.79 km downstream.
if the settling velocity of a particle is 2.80 mm/s and the overflow rate of an up flow clarifier is 0.560 cm/s, what percent of the particles are retained in the clarifier. If the flow rate of this problem is doubled
A two lane hwy with 12' lanes is to be reconstructed to a design speed of 50 mph. Due to right of way restrictions, the largest distance that can be cleared from the edge of the road is 10'. What is the min. radius?
The absolute viscosity and density of water are 1.4X10^-3 Pa-s and 998 kg/m^3, respectively. For a head loss of 0.1 m, determine the filtration rate (m/d) if the depth of this layer of sane is 0.1m
a gate having a cross section closes an opening 5 ft wide and 4 ft high in a water reservoir. its center of gravity is one foot to the left of AC and 2 ft above BC. Determine horizontal reaction developed on the gate at C.
Estimate the steady state PM10 concentration assuming a PM10 deposition velocity of 0.12 cm/s, prevailing wind velocity of 2.5 m/s, and a constant emission flux of PM10 0.82 mg/m2-s.
If a SS concrete beam, prestressed with a force of 2500 kn,effective span = 10m. It carries a load of 40 kN/m, the central dip of the cable profile should be
The distance l, which is the distance between the outside face of the exterior support at the left-hand end of the beam and the center of the interior support at the right-hand end, is 30ft; the width of the exterior support at the left is 16in.
Estimate the total cost and cost per linear foot for furnushing and driving steel-sheet piling for construction of the basement of a building, 150 by 240 ft. the piles will be 22 in. wide, 18 ft. long, and weigh 40.3 Ib/Lin ft. the piles will be driv..
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