2. A survey on the background concentration of lead in soil was conducted in an Environmental Impact Assessment of a former battery plant. Preliminary results of six soil samples in the protected area give results in mg/kg: 28, 32, 21, 29, 25, 22. (a) Is there any value in this data set that can be discarded as an outlier at 90% confidence level? (b) Calculate CV, RSD, and 95% Confidence Interval (CI)?

2. A survey on the background concentration of lead in soil was conducted in an Environmental Impact Assessment of a former battery plant. Preliminary results of six soil samples in the protected area give results in mg/kg: 28, 32, 21, 29, 25, 22. (a) Is there any value in this data set that can be discarded as an outlier at 90% confidence level? (b) Calculate CV, RSD, and 95% Confidence Interval (CI)?

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter17: Subsoil Exploration

Section: Chapter Questions

Problem 17.2P

See similar textbooks

Similar questions

The soil boring logs for a new development determined that the mean moisture content of the soil is 15.0% with a standard deviation of 2.5%. If you assume that the moisture content is a normally distributed value and the standard deviation of the soil is known(not estimated),what is the probability that a sample taken from the development will have a water content above 20% or below 10%?
Q 01: a) How can you calculate BOD value? What happens if you have a higher BOD value? b) Differences between COD and BOD? Subject: environmental engineering ii lab
Given: True value= 2.76 ml Bulk density = 1.86 g/ml Bulk mass= 3.57 g 1. What is the bulk volume of the sample? 2. What is the Hausner Ratio? 3. What is the compressibility index?
Answer both 1 (i) and (ii) 1) i) A 6 inch diameter well that fully penetrates a 40ft thick open aquifer is pumped at a rate of 100 gpm. The drawdown in the well is 22ft when a steady water level is established. The drawdown in a well 152ft distant is 12ft. Estimate the coefficient of permeabiliity of the soil deposit. ii) Discuss the validity of the answer obtained in 1( i ) and suggest how would you improve the test data obtained to produce a better value of k. Why?
Calculate the CEC of a 100g soil sample that was found to contain the following cations: Ca2+ = 0.12g Mg2+ = 0.024g K+ = 0.078g Al3+ = 0.027g NH4+ = 0.036g H+ = 0.002g
A liquid limit test on a clay was performed with the following results. The natural water content of the clay is 38% and plastic limit is 21%. Number of Blows 6 12 20 28 32 Water content (%) 52.5 47.1 42.3 38.6 37.5 What is the plasticity index of this clay? (Use Interpolation) Group of answer choices 15.74% 18.99% 18.85% 17.63% Please answer this asap for upvote. thanks
The BOD5 of a sample is 75 mg/l for the value of k equal to 0.345/day. Determine the value of BOD remaining in the sample after 10 days.
A liquid limit test on a clay was performed with the following results. The natural water content of the clay is 38% and plastic limit is 21%. Number of Blows 6 12 20 28 32 Water content (%) 52.5 47.1 42.3 38.6 37.5 What is the liquid limit of this clay? (Use Interpolation) Group of answer choices 39.85% 39.99% 36.74% 38.63% Please answer this asap for upvote. Thanks
In a liquid limit test, using cone penetrometer, the following readings are recorded. Plastic Limit test Weight of wet soil+container= 22.12g Weight of dry soil+container=21.42g Weight of container = 13.07g Natural water content test Weight of wet soil+container= 17.53g Weight of dry soil+container=14.84g Weight of container = 7.84g A.Compute the liquid limit B.Compute the plastic limit C.Compute the natural water content D.Compute the plasticity index E.Compute the liquidity index F.Compute the consistency index 7. Define the consistency of the soil based on the liquidity index
QUESTION 2 a. The results given in Table 1 were obtained in a particle size distribution test for soil sample received in the laboratory. Table 1 US Sieve No. Size Opening(mm) Weight Retained(g) 4 4.75 0 10 2.0 18.5 20 0.85 53.2 40 0.425 90.5 60 0.25 81.8 100 0.150 92.2 200 0.075 58.5 Pan - 26.5i. Determine the percentage passing each sieve and plot the particle size distribution curve. ii. How much fine-grained soils are in the sample ? iii. Determine the amount of gravel and sand in the sample ? iv. Determine D10, D30, and D60 from the grain-size distribution curve. v. Calculate the uniformity coefficient, Cu. vi. Calculate the coefficient of gradation, Cc. vii. Describe the gradation curve (eg poorly graded)
Subj- civil Q. An undisturbed soil sample that is cylindrical in shape and measures 3 in (76.2 mm) in diameter by 6 in (152.4 mm) in length after oven drying weighs 2.57 lb (1.166 kg bulk) as opposed to 3.04 lb (1.38 kg mass). What are the densities and the weights in (a) wet and dry units? Additionally, find out the moisture content.
Calculate the arithmetic average and thickness-weighted average oil saturation. SAMPLE THICKNESS , h Oil Saturation, % 1 2 75 2 3.5 74 3 1 73 4 4 76 5 2 75 6 2 72