Leachate is a solutions, frequently highly contaminated, : GMAT Critical Reasoning (CR)
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# Leachate is a solutions, frequently highly contaminated,

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Leachate is a solutions, frequently highly contaminated, [#permalink]

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19 Aug 2004, 11:21
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12. Leachate is a solutions, frequently highly contaminated, that develops when water permeates a landfill site, If and only if the landfill's capacity to hold liquids is exceeded does the leachates escape into the environment, generally in unpredictable quantities, A method must be found for disposing of leachate. Most landfill leachate is send directly to sewage treatment plants, but not all sewage plants are capable of handling the highly contaminated water.

Which one of the following can be inferred from the passage?

(A) The ability to predict the volume of escaping landfill leachate would help solve the disposal problem.

(B)If any water permeates a landfill, leachate will escape into the environment.

(C) No sewage treatment plants are capable of handling leachate.

(D) Some landfill leachate is send to sewage treatment plants that are incapable of handling it.

(E) If leachate does not escape from a landfill into the environment, then the landfill's capacity to hold liquids has not been exceeded.

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19 Aug 2004, 14:02
if and only if equals

Landfill Full -> Leacheate will Escape.
Leacheate will Escape -> Landfill Full.

the contrapositvie of the first is

If the Leachate does not escape -> Landfill is not full

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19 Aug 2004, 17:18
Also got E although D was a good contender. I guess we can just not refute D because all we know is most contaminated water is sent to sewage plants and those plants could just be well equipped. It might be some other plants which are not well equipped to treat the contaminated water and hence, they may represent a risk if that water gets to them.
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Paul

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19 Aug 2004, 17:21
Paul wrote:
Also got E although D was a good contender. I guess we can just not refute D because all we know is most contaminated water is sent to sewage plants and those plants could just be well equipped. It might be some other plants which are not well equipped to treat the contaminated water and hence, they may represent a risk if that water gets to them.

Yeah, D is one of those answers that "most likely is true", but not "MUST be true", which is how they get most people on these CR's. Whenever they say "what can be inferred" or "what must be true", you look for the irrefutable statement.
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19 Aug 2004, 18:55
(A) never mentions that the predicitn gvolume can help dispose leachate
(B) is wrong. leachate only escapes when landfill's capacity to hold water is exceeded
(C) is wrong as well, it sames not all sewage plants, not none, can handle leachate
(D) is correct. We are told most are sent to treatment plants, but not all plants can handle leachte. So some landfill leachate are sent to plants that are not capable of handling it
(E) is wrong as well. A landfill can be exceed in capacity and not be p
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19 Aug 2004, 19:00
Leachate is a solutions, frequently highly contaminated, that develops when water permeates a landfill site, If and only if the landfill's capacity to hold liquids is exceeded does the leachates escape into the environment, generally in unpredictable quantities, A method must be found for disposing of leachate. Most landfill leachate is send directly to sewage treatment plants, but not all sewage plants are capable of handling the highly contaminated water.

From the passage, we're told leachate developes when water permeates a landfill site.
Leachate will escape when the landfill's capacity to hold liquids is exceeded.

But (E) assumes that if no leachate is escaping, the landfill is not exceeded. It fails to acknowledge that there may be no leachate in the landfill at all if no water has permeated the landfill site.

(D) might be better. If most leachate are sent to treatment plants, but not all treatment plants are capable of handling the solution, then some (not most) leachate are sent to treatment plants that are incapable of handling it.
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19 Aug 2004, 19:32
ywilfred wrote:
Leachate is a solutions, frequently highly contaminated, that develops when water permeates a landfill site, If and only if the landfill's capacity to hold liquids is exceeded does the leachates escape into the environment, generally in unpredictable quantities, A method must be found for disposing of leachate. Most landfill leachate is send directly to sewage treatment plants, but not all sewage plants are capable of handling the highly contaminated water.

From the passage, we're told leachate developes when water permeates a landfill site.
Leachate will escape when the landfill's capacity to hold liquids is exceeded.

But (E) assumes that if no leachate is escaping, the landfill is not exceeded. It fails to acknowledge that there may be no leachate in the landfill at all if no water has permeated the landfill site.

(D) might be better. If most leachate are sent to treatment plants, but not all treatment plants are capable of handling the solution, then some (not most) leachate are sent to treatment plants that are incapable of handling it.

And if water did not permeate the landfill, then there is no leachate at all. Hence, landfill capacity could be exceeded without leachate leakage. ywilfred, that was brilliant. You proved us wrong
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20 Aug 2004, 07:08

Anyone likes to explain this question further.
20 Aug 2004, 07:08
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