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Consider the following statements 1. The static cone penetration test is unsuitable for layered deposits of sands, silts and clays. 2. The results of groundwater investigation are recorded as water-table contours over the site. 3. Closed Piezometer is used to measure pore water pressure in soils having low permeability. Which of the above statements are correct?

Consider the following statements 1. The static cone penetration test is unsuitable for layered deposits of sands, silts and clays. 2. The results of groundwater investigation are recorded as water-table contours over the site. 3. Closed Piezometer is used to measure pore water pressure in soils having low permeability. Which of the above statements are correct? Correct Answer 1 and 3 only

Statement I: True

Suitability of SCPT:

It is used for very soft and loose soils only.

Unsuitability of SCPT:

This test cannot be used for gravels, layered soils and very dense sands owing to difficulty experienced in pushing the cone and anchorage system inside the soil strata.

Statement II: False

A ground water report should include the following:

1. Factual data― Such as geology, correlation charts of unconsolidated and consolidated materials, maps showing areal extent of important materials or rock formations, locations of test holes, pits, rock exposures, natural recharge areas, springs or withdrawal areas, and locations of logged wells etc.

2. Log sheets -Describing materials encountered or observed and their classification, hardness, density, estimated gradation, and permeability.

3. Water levels- Whether water tables are static, perched, or under artesian pressure will be indicated,. Records of pumping or permeability tests etc.

Statement III: True

For fully saturated soils of high permeability, such as sands and gravels, the water pressure can be obtained using an open standpipe placed in a borehole.

In case of soils of medium to low permeability, open standpipes cannot be used because of the large time lag involved, closed Piezometer are used.

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