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An oil-storage area was abandoned 18 years ago. Oil spilled on the ground had saturated the soil at a concentration of 400mg/Kg of soil. A fast food chain now wants to build a restaurant at the site, and samples the soil for contaminant, only to discover that the soil still contains oil residue. You are consulted as the expert environmental engineer on biodegradation of oil spill to give advice. Having identified the microorganism involved the biodegradation and discovered that its mode of action is first-order reaction with a reaction rate constant of 0.25 year-1, .
a) What is the calculated concentration on the site?.
b) How long will it take for the soil concentration to be below the acceptable EPA Maximum Contamination Level (MCL) of oil is 1 mg/kg of soil?
c. A 1.5 million gallon water reservoir in Avila Beach in California was contaminated by oxygenated gasoline containing 0.5% by weight of MBTE when the pipeline busted. If the estimated volume of gasoline released into the reservoir was 5000 gallons and the specific gravity of gasoline is 0.870. Density of water is 1000kg/m3. Calculate in ppb the concentrations of
i. Gasoline in the reservoir
ii. MBTE in the reservoir
Water at a flow rate of 1 kg/s is flowing in a pipe of internal diameter 5 cm. If the inside pipe surface temperature is 90 degrees C and mean bulk water temperature is 50 degrees C
A runs slope a distance of 156.777 m from one point to another point at a rate of +1.5%. What is the corresponding horizontal distance between the points?
What type of exercise takes place in a classroom setting arranged to look like an emergency operations center or in an actual emergency operations center, and involves simulation using written, telephone, and radio messaging.
A circular rc girder for the foundation raft of water tower has dia 10m.the udl load transmittedby 8 coloumn on te girder being 300 kn/m.the width of the beam is 500 mm and the over depth.
Determine the compressive strengths of the following
Calculate the distance d from the center of the earth at which the force on a particle from the moon is equal to 1.49 times the force on the particle from the earth. The particle is restricted to the line through the center of the earth and the mo..
a) calculate the operational compressive strain this copper specimen is subjected to. b) calculate the maximum strain this copper alloy can sustain without becoming plastically deformed.
Identify the forces that work against the success of cladding systems in keeping the elements out.
A motorcycle sprocket on the rear wheel has a diameter of 24 cm, and trhe driver sprocket has a diameter of 4.0 cm. The driver sprocket shaft and rear axle are 60 cm apart.
A cylindrical water tank is suspended vertically by its sides. The tank has a 10-ft diameter and is filled with 20 degree celcius water to a 3-ft depth. Determine the force exerted on the tank bottom
A bicycle rider would like to compare the effectiveness of candilever hand brakes (use figure a) versus V brakes (figure part b). (a) Calculate the braking force Rb at the wheel rim for each of the bicycle brake systems.
A train which is traveling at 80 mph applies its brakes as it reaches point A and slows down with a constant deceleration. Its decreased velocity is observed to be 60 mph as it passes a point 1/2 miles beyonds A.
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