In the north-eastern part of a particular Caribbean island, in a valley close to a mountain range the water table tends to be high within the soil profile during the wet season. Soil and groundwater samples were taken at various points within the water table region for analysis. The groundwater was found to have a high divalent calcium ion concentration but a low oxygen concentration. (i) Predict the pH of the groundwater. Explain your answer. (ii) Predict the colour of the soil samples obtained. Explain your answer.

In the north-eastern part of a particular Caribbean island, in a valley close to a mountain range the water table tends to be high within the soil profile during the wet season. Soil and groundwater samples were taken at various points within the water table region for analysis. The groundwater was found to have a high divalent calcium ion concentration but a low oxygen concentration. (i) Predict the pH of the groundwater. Explain your answer. (ii) Predict the colour of the soil samples obtained. Explain your answer.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter5: Classification Of Soil

Section: Chapter Questions

Problem 5.10P

See similar textbooks

Similar questions

Results from a liquid limit test conducted on a soil are given below. a. Determine the liquid limit of the soil. b. If it is known that the PI = 6.5, what would be the plastic limit of the soil? c. Determine the liquidity index of the soil if win situ = 23.8%
In a partially saturated soil, the moisture content W% is 66.67%, the relative specific gravity of solids Ss is 2.5, and the saturated specific gravity of the sample is 1.45 g/cm3. If the volume of air is equal to 8 cm3. Determine the other quantities of the scheme, and calculate: e, n, Gw%, Ym, Yd, Ysat, Y'. Note: Kindly answer all with clear calculations.
Q1-) A soil sample in plastic limit state weighs 2.535 N and becomes 1.980 N after oven drying. The plasticity index and the shrinkage limit of the soil are 11% and 15% respectively. Determine the quantity of water in liter to be added or taken out of the sample to change its state to: i- Solid state. ii- State at which the liquidity index equals to two.
You are working in a lab and are tasked with determining the percent plant available water for a particular soil sample. You take a field soil sample. The mass of your sample was 152g and it had 18.3% moisture by mass. Then, you place the soil sample in your pressure plate extractor and determine that the soil sample weighs 164.2g when the moisture potential is -33kPa and 130.7g at -1500kPa. What is the percent plant available moisture by mass of this soil sample? Please answer to one decimal place.
A sample of soil in its natural state has a volume of 1.396 m3 and weighs 18.662 kN. The sample was taken to the laboratory to determine the mass of solids. After oven-drying, the soil weighs 15.036 kN. If the specific gravity of the soil solids is 2.667, determine the following: Porosity, Degree of saturation, Effective unit weight. show complete solution
PROBLEM 1: A certain soil sample has moisture content of 22%, a liquid limit of 15% and a plastic limit of 11%. Determine its liquidity index.
In a constant head permeability test, a soil sample is compacted into a round PVC pipe and placed into a tank as shown. After sufficient time is allowed for saturation of the soil, the test is conducted under standard temperature pressure conditions for 4 hours. A total of 227 g of water is decanted into a measuring vessel during the test. What is the coefficient of permeability of the soil?
2. The soil sample in a test has a diameter of 5 cm and a height of 15 cm, the test is carried out for 10 seconds and the water level is 20 cm, the water flowing through the sample is measured as much as 50 cm3. What is the permeability of the soil? k₂ 9z Ai QL tAh (USE THIS FORMULA)
A soil having natural moisture content of 28% has a liquid limit of 54% and plastic limit of 32%. Calculate the liquidity index of the soil.
3. A soll sample was determine in the laboratory to have a liquid limit of 41% and a plastic limit of 21.1%, if the water content is 30%; What is the plasticity index? What is the liquidity index? b. 17.44 b. 0.56 c. 19.90 c. 0.45 What is the characteristic of the soil? a. liquid b. moist c. semi plastic d. plastic 3.1. 3.2. 3.3. 4.2. 4.3. A. 16.38 A. 0.38 4. A sand soll 8.5 meters thick is composed of dry layer and a saturated layer due to the water table located at 3.5 meters below the ground level. The dry part of sand has Gs=2.66 and n=37.89%. below the water table, e=0.48 and Gs=2.67. 4.1. What is the effective stress developed at 3.5 m below the ground level? a. 56.74 KPa b. 64.84 KPa c. 47.16 KPa d. 73.08 KPa What is the effective stress at the bottom most part of the soil? a. 120.31 b. 76.80 c. 115.64 d. 137.50 At what height the ground water table will rise so that the effective stress at the bottom most of the soll be 104 KPa. a. 1,32 m b. 1.40 m c. 2.65 m d. 1.87 m 5. A sand…
Question 3. A DNAPLS substance was generated and released in a tire fire accident. A consulting firm was hired to carry out an assessment of the aquifer at the accident site. A subsurface plume of contaminant X was detected in the aquifer. The aquifer is located at a depth of 1300 m with a soil porosity of 34% and hydraulic conductivity of 41 m/d. The fraction of organic content in the soil is 1% and dry bulk density is 2000 kg/m3. Assume the Octanol-water partition coefficient of the substance, log Kow = 2.78.What is the Retardation factor (R) of DNALPS substance in this case? State your assumptions.
05: The Figure below represents the data that was obtained from a liquid-limit test on a soil. 50 percent of its particles is passing sieve #200. Two determinations for the plastic limit gave water contents of 20.3 % and 20.8 %. Determine 1- Liquid Limit (LL). 2- Plasticity index. 3- Liquidity index if the water content is 27.4% 4- Void ratio at the liquid limit, if G, 2.7 5- Classify the soil based on AASHTO system. 30 10 20 40 60 80 100 Penetration, d (mm) Moisture content, w ()