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Estimate the chronic daily intake of 1,1,1-trichloroethane from exposure to a city water supply that contains a 1,1,1-trichloroethane concentration equal to the drinking water standard of 0.2 mg/L. Assume the exposed individual is a child (8 years old) who consumes water at the child rate for 4 years, that he swims once a week for 30 min, and that he takes a short (10 min) bath every day. Assume his average body weight over the exposure period is 26 kg. Assume that the average air concentration of 1,1,1-trichloroethane during the bath is 2 µg/m^3. Assume the dermal uptake from water (PC) is 0.006 m/hr and that direct dermal absorption during bathing is no more than 80% of the available 1,1,1-trichloroethane because he is not completely submerged. Assume the body weight and skin surface area are constant during the exposure period.
A field sample of medium sand with median grain size of 0.84 mm will be tested to determine the hydraulic conductivity using a constant-head permeameter. The sample has the length of 30 cm and a diameter of 5 cm.
What is the major head loss in a coarse concrete pipe with a diamter of 1ft that is 100 ft long. Water flows at a rate of 20 ft^3/s (viscosity of water = 2.344x10^-5 lbfs/ft^2, density of water = 1.94 slugs/ft^3) 1inch = 25.4mm
A closed rigid tank contains 2kg of saturated water vapor initially at temperature of 433K. Heat transfer occurs from the system and the pressure drops to 150kPa. Determine the amount of heat loss by the system.
Compute departures and latitudes, linear misclosure, and relative precision for a five-sided, closed traverse. It is given that the aziumuth of AB is 74 degrees 31 minutes, 17 seconds, A = 105 degrees 13 minutes 14 seconds B = 92
A line passes through the points (22 m, 19 m) and (-2 m,-5 m). determine the perpendicular distance d from the line to the origin O of the system of coordinates.
Consider the design of wastewater treatment plant for a community wiyh average daily and peak hourly wastewater design flows of 2.0 mgd. The raw sewage has an average of 230 mg/l BOD5 and 260 mg/l of suspended solids.
determine the number of bricks and cubic feet of mortar required for 100 square feet of wall. the ties are to be spaced 16 inches on center vertically and 24 inches on center horizontally
a gate having cross section shown in fig closes an opening 5 ft and 4 ft high in a water reservoir. The gate weighs 400lb and its center of gravity is 1 ft to the left of AC and 2 ft above BC. Determine the horizontal reaction that is developed on..
A 1.0 × 106 gallon reactor is used in a sewage-treatment plant. The influent biochemical oxygen demand (BOD) concentration is 100 mg/L, the effluent BOD concentration is 25 mg/L, and the flow rate through the reactor is 500 gal/min.
A vertical curve is formed when a rural highway passes under a bridge joining a -8% grade to the horizontal grade satisfying the requirement for safe speed of 90 Km/hr . Determine the minimum clearance required betewen the highway pavement surface..
helium gas contains trace amounts of methane. Consider a helium balloon pressurized to 5 psi. If methane molar mixing ratio is 800 ppmv, what is the pressure of methane in the balloon
A quality of water within a piston-cylinder assembly executes a Carnot power cycle. During isothermal expansion, the water is heated from saturated liquid at 50 bar until it is a saturated vapor. The vapor then expands adiabatically to a pressure ..
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