A 2-year-old child has been playing in soil contaminated with 500 mg/kg of tetrachloroethylene. It is estimated that she ingested 5 g/day of soil over an 8-month period. The exposure frequency was 7 days per week. The EPA standard weight for a child 1-5 years-old is 16 kg. What is the chronic daily intake (CDI) of tetrachloroethylene for the child over the 8-month period? What is the percent change in CDI if the child actually weighs 12 kg?

Q: Three wheel loads roll as a unit across a 60-ft span. The loads are P1 = 15000 lb and P2 = 9000 lb…

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Q: PROBLEM 4: The basic barometer can be used to measure the height of a building. If the barometric…

A: Given data:Ptop=730 mm HgPtop=755 mm HgAverage air density=1.18 kg/m3Specific gravity=13.55

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Q: 2. The field unit weight of the soil sample 1s 1960 kg/m³ and the unit weight of the soil particle…

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Q: 1. A saturated soil with a volume of 19.65cc has a mass of 36g. When the soil was dried its volume…

A: Saturated soil  Volume V1 = 19.65 cc Mass M1 = 36 GM Dry soil Volume V2 = 13.5 cc Mass M2 = 25 gm…

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Q: From the given figure below : A. Compute the bending stress in the beam, in MPa, shown in the figure…

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Q: A city requires a flow of 30 MGD (million gallons per day) for its water supply. Compute the…

A: V=6ft/s Q=30MGD

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A: Manometer: - It is an instrument by which one can find fluid pressure.

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A: Given: The observations for two peg tests are,   Instrument at A Instrument at B Rod…

Q: check if the answers are correct. Show solution for corrdep and corrlat

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Q: The directions observed from a satellite station 5, 70m from a triangulation station C, to the…

A: Given data:- θ=71°32'54''α=301°16'15"a=AC=2750 m=2.75 kmb=BC=4165 m=4.165 kmd=70 m Assume angle…

Q: PROBLEM 2: A pipe transports 1962 N/s of water. The pipe tees into a 2"-diameter pipe and a…

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Q: Find the derivative of 3^3x * O -In 3x O In 3x O 3ln3 3^3x -3ln3 3^3x O O O O

A: From the given options, the 3rd option is correct. Solution is given below...

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Q: Given the laboratory results of the Atterberg Limit Test, plot the water content versus the number…

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Q: Part A Suppose that L = 6.6 in. (Figure 1) Locate the centroid (, j). Express your answers using…

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Q: The weight of the crate is 50 kg and the spring constant is 200 N/m in DB. Use g= 9.81 m/s2.

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Q: Determine the resultant of B and C if the resultant of A and B is 100 kN directed along the z-axis.

A: Given, Resultant of A and B =100 kN

Q: B. A rectangular scow having a length of 15 m, width of 8 m, and 6 m deep has a displacement of 164…

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Q: Problem 3: Compute the equivalent rate of (A+B+C+D+E) % compounded semi-annually to a rate…

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Q: mine also the maximum values= concentrated moving load of 10 km. N/m. 400 uniform live load of

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Q: please answer correctly and show the solution

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Q: 21- Students A and B compete in final exams. Who was more accurate and won the competition? Results:…

A: Given: Two sets of final exam marks of students A and B

Q: 6. A rectangular channel 6.20 m wide by 1.3 m deep is lined with a smooth stone, well laid and has a…

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Q: Find the equation of the normal line to the graph y= x In x that is perpendicular to the line x - y…

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Q: Determine the largest weight W which can be supported by the two wires shown. The stresses in wires…

A: Given The stresses in wires AB and AC are not to exceed 150 MPa and 100 MPa. The cross-sectional…

Q: A trapezoidal channel of bottom width 25' and side slope of 1 (Vertical):2.5 (Horizontal) carries a…

A: Solution -idth =25 inch Side slope =1: 2.5 Normal depth =3.5

Q: 1. A structure is attached to the ocean floor as shown in the Figure. A 2-m-diameter hatch is…

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Q: D10 = 0.09 D60 = 0.31 = 0.16 3.Given: Soil 1 D30 = 0.18 Soil 2 D10 D60 = 2.20 D30 a) Find C, of Soil…

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Q: 1. What diameter of pipe is required to carry 12 gallons per minute (gpm) of gasoline at a velocity…

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Q: 3.50. Annual floods for a stream have a normal frequency distribution. The 2-year flood is 40,000…

A: Data for 2 year flood and 10 year flood is given in the question

Landfills

The landfill is a site used for the disposal of waste materials. The landfill is a solid waste facility that is often known as a dumping ground. The image below shows a landfill site in Hawaii. Landfilling is the most ancient and common method used for the disposal of waste. For the landfill, a deep trench is constructed in an isolated place away from the city. The trench for landfills is designed properly after analyzing the total population and the waste generation per capita. The waste is dumped into the trench and after every layer of waste, a layer of soil is spread on the top of it.