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The article "Leachate from Land Disposal Residential Construction Waste" (authored by W.J. Weber, Y.-C Jang, T.G. Townsend, and S. Laux, Journal of Environmental Engineering, 128(3): 237 - 245, 2002) presents a study on contamination at landfills containing construction and demolition wastes. Specimens of leachate were taken from a test site. Out of 42 specimens, 26 contained detectable levels of lead. 41 contained detectable levels of arsenic, and 32 contained detectable levels of chromium.
(a) Determine a 90% confidence interval for the probability that a specimen will contain a detectable level of lead.
(b) Determine a 95% confidence interval for the probability that a specimen will contain a detectable level of arsenic.
(c) Determine a 99% confidence interval for the probability that a specimen will contain a detectable level of chromium.
Determine the time required for a car to travel 1 km along a road if the car starts from rest, reaches a max speed at some intermediate point, and then stops at the end of the road. the car can accelerate at 1.5 m/s^2 and decelerates at 2 m/s^2
To what precision (how many decimal places) must you know the value of a decimal degree in order to reliably convert it to the nearest second (1/3600 of a degree) To what precision (how many decimal places) must you know the value of a radian
150,000 mol of aqueous phosphoric acid (H3PO4) solution contains 5.00% H3PO4 by moles. The solution is concentrated by adding pure H3PO4 at a rate of 20.0 L/min.
A rod is subjected to a tensile load of 25k and has a diameter or 2in, determine the principle strains at a point on the surface of the rod
A) Estimate the aquifer porosity and hydraulic conductivity, B) determine the flow rate per unit width of the aquifer, C) determine the specific discharge, D) determine average linear velocity of the flow assuming steady unidirectional flow
A reservoir has a capacity of 2.75 million acre-ft. How many years would this supply a city of 100,000 people if evaporation is neglected. Assume a use rate of 180 gpcd.
(a) Use differentiation to find a general expression for the rocket's velocity as a function of time, (b) When is the velocity zero?
Using a design speed of 50 mi/h, determine the stations and elevations of PVCs, PVIs, and PVTs of the two vertical curves required to connect the highway segments, as well as the length of the constant grade section (connecting grade is to be as s..
The dissolved oxygen of sample water is 1.5 mg/L. At 25 C, the dissolved oxygen of the dilution water is 8.25 mg/L. You are told the BOD5 of the sample is 130 mg/L. You have a target final dissolved oxygen of 3.0 mg/L (give yourself some leeway).
Ethyl acetate is made from acetic acid and ethyl alcohol. Let x = pounds of acetic acid input, y=pounds of ethyl acohol input, and z = pounds of ethyl acetate output. The relationship of output to input is: z^2/(1.47x - z)(1.91y - z) = 3.9.
you purchased an old machine at the beginning of this year.maintanance on this old machine will be 100$ at the end of this year but is expected to increase by $25 each year after. what is the present worth of five years of the cost of maintanance
What is the overall specific gravity of a sample initially packaged with a moisture content of 3.5% below the optimum, then saturated (Assume that the soil sample can be compressed fully saturated with water without the occurrence of variation in ..
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