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The total saturated thickness of the aquifer is 15 m. Predict the concentration distribution along the water table after 5110 days, assuming a linear groundwater velocity of 1.6x10-3; dispersivitie
State 5 reasons why adding things to a project charter late in the project execution could be a detriment to the project's objectives
Assume that an egg can be hatched only in the week after it is laid. Otherwise it must be saved and sold for 10 cents. Assume that there are no eggs available for hatching in the first week.
TCE from a spill accumulates in a depression of a parking lot. Estimate how fast the solvent volatilizes (in g of TCE per cm^2 per unit time) when these conditions exist: a. The wind speed is 2 m/se
The pesticide methyl parathion is leached into a stream from an abandoned disposal site. Is photolysis likely to be a significant sink for this chemical. If the travel time to the ocean is 5 days
(a) What are some of the important properties of unalloyed copper that make it an important industrial material (b) How is copper extracted from copper suflide ore concentrates
(a) What are some of the properties that make aluminum an extremely useful engineering material (b) How is aluminum oxide extracted from bauxite ores (c) How is aluminum extracted from pure aluminum o
An earth embankment is compacted at water contect of 17% to a bulk density of 1.90 gm/cc.If the specific gravity of soil grains is 2.65, then what will be the degree of saturation of the compacted e
A 1 m3 sample of air was found to contain 88 mg/m3 of NO2 .The temperature and pressure were 25.0°C and 103.2 kPa when the air sample was taken. What was the NO2 concentration in parts per millio
An article reports measurements of expansion for several concrete bridges in the area of Quebec City. Following are measurements of horizontal and vertical expansion (in parts per hundred thousand)
The house has a 1 m high dirt-floored crawl space. The emission rate of radon into the crawl space is reported to be 0.6 pCi/m2s. An exhaust system was added to provide 1 air exchange per hour (ACH)
A soil is to be compacted on a site and it is expected that the soil contains a high percentage of montmorillonite. Briefly explain the working principles of two tests that can be carried out to asce
A rental company is deciding whether or not to purchase the equipment. The company estimates the equipment will create annual incomes of $110K and have annual operating costs of $20K.
The investigation results indicated that the clay had a saturated density of 1.6 Mg/m3, an average initial void ratio of 1.8 and the preconsolidation pressure at the mid depth of the clay layer was
Briefly explain how variation in water table elevation can result in overconsolidation of a soil and list oehr possible mechanisms that cause over consolidation of soils.
Calculate the percentage of change in total volume with respect to its initial volume when a specimen of this clay is completely dried from a water content of 80%. Assume that the clay remains satur
A homogeneous coarse sand deposit has a water table at 10 m depth. The water coefficient of permeability of the sand is found to vary significantly with height above the water table even though the
A tensiometer is used to measure a compacted soil in the field that has a matric suction of 200 kPa under atmospheric conditions. The pore-water pressure measurement in the tensiometer reaches -99 k
A clay ball (m=0.82 kg) is thrown at a metal target (M=1.72 kg) that is suspended from a cable. The ball is released 1.5 m above teh ground at an angle of 32 degrees.
A column of dimensions 200 X 300 mm has an effective length of 3m. It is reinforced with 6 HYSD bars of 20mm diameter. Determine the safe load the column can carry using working method of design. Us
What is the effective stress 25 feet deep if the specific weight of the dry soil (dry unit weight) is 120 pcf and the water table is 12 feet deep
A 110 cm^3 sample of wet soil has a mass of 106 g and a degree saturation of 100%. When oven-dried, the mass is 81 g. Determine the 1) water content, 2) specific gravity, 3) void ratio, and unit dry
We have a batch reactor ( r = -k1) with volume of V1. The concentration entering the batch reactor is Co. The batch reactor is operated from t =0 to t = t1. After that the water exits
Air photos are taken with specified overlap to take advantage of image parallax. Calculate the time interval between air photo exposures if the ground speed of the aircraft is 160km/h, the focal len
A 55 KG bungee jumper leaps from a bridge. She is tied to a bungee cord that is 12 m long when unstretched, and falls a total of 31 m. Calculate the spring constant of the bungee cord assuming Hooke