Reading Comprehension

PT158 · S1 · P1 · Q5 Deep Well Injection

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A major problem facing industrial societies is their exponentially increasing production of toxic waste.

Topic

The risks and problems associated with deep-well injection as a method for hazardous waste disposal in industrial societies.

Framework

Problem / Solution

Main Point

Although deep-well injection is increasingly used to dispose of hazardous waste due to cost and regulatory pressures, it poses significant risks—including mechanical failure, human error, and unpredictable underground movement of waste—that make it a problematic and potentially dangerous solution. Most Valuable Sentence: Last paragraph:

P1: Introduction to Deep-Well Injection and Its Controversy

This paragraph introduces the growing problem of toxic waste in industrial societies, describes how regulations and costs have led to the increased use of deep-well injection for hazardous-waste disposal, and notes that this method is controversial, especially as more people depend on underground water sources. It ends by foreshadowing that there are three key problems with this method.

P2: Mechanical Failures and Human Error

Here, the passage explains the first two major problems: wells can leak, allowing dangerous chemicals into drinking water sources, and human error (like faulty well construction) can have dire consequences. Example: a well with a casing gap almost contaminated water for 100,000 people, and such issues might go unnoticed for a long time.

P3: Unpredictable Movement of Underground Waste

This paragraph details the third problem: it’s extremely difficult to predict how wastes will move underground due to complex, variable pressure gradients. Wastewater can travel in any direction, sometimes over great distances, making containment unpredictable.

Based on the passage, which one of the following most accurately states the purpose of deep-well injection of hazardous waste?

It serves as a short-term
Short-term
Nothing in the passage suggests that companies are injecting hazardous waste into deep wells "for a little bit, until it's not toxic anymore, at which point they'll retrieve it from the well and put it somewhere else." The passage is giving off more of a vibe that we inject this waste deep down below the aquifers, hoping we'll never see it again. The passage never mentions any process — natural, chemical, or otherwise — that would neutralize or reduce the waste's toxicity over time. The waste goes in toxic and, as far as the passage tells us, stays toxic.
6% picked this
It makes aboveground hazardous-waste disposal
Too Strong: obsolete
We are told it's cheaper / faster than aboveground methods such as landfills and incinerators. But this answer is saying that deep-well injection has made it so that no one uses landfills or incinerators anymore. That's not something we can derive from the passage. We just know "many industries have turned to deep-well injection", we don't know that "most / all" of them have.
9% picked this
Correct
It contains hazardous wastes in
Why this is right
This correct answer is dumb but derivable. It's not really answering the question (the purpose of doing deep-well rather than other methods is to save time and money); it's just a true description of the practice itself, and unlike the other answer choices, it doesn't say anything unsupportable. The expression "it contains X in Y" is not one we frequently use. We could say, "I contain my coffee in a mug", or we could say "my mug contains coffee". The point of injecting waste deep down is to contain it somewhere. The place where they inject the waste is an underground area. Is that area saltwater-saturated? Yes: in this method, wells are drilled into porous and permeable rock strata that are already saturated with salt water. Since everything in this answer is derivable from the passage, whereas other answers each suffer from some poisonous wording, this is our best available answer.
Skill tested: Locate Detail · how this choice captures the passage's function is the move to repeat next time.
82% picked this
It creates underground pools of
Easily
The passage never tells us that when we inject waste deep into underground strata, we have a super convenient way of monitoring what's going on down there. If anything, the passage suggests the opposite. The passage emphasizes that underground water movement is unpredictable — liquid may travel through sneaky subterranean pressure gradients in any direction. Reliable monitoring is precisely what the passage argues we cannot achieve. And nothing in the passage suggests continuous monitoring is feasible or intended. The author is so worried about problems that could secretly be happening at those depths — leaks, erosion of pipeline — that the idea of round-the-clock monitoring clearly isn't on the table.
2% picked this
It recycles certain low-toxicity wastes.
Out of Scope: low-toxicity recycling
Nothing in this 1st paragraph or passage says that the hazardous-waste that we're injecting into deep wells is "low toxicity", nor does it say that we're recycling any of that waste.
1% picked this

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