| Course | PHLT 8034 Environmental Health |
|---|---|
| Week | Week 6 |
| Paper type | Peer critique |
| Length | About 450 words, 3 pages |
| Format | Discussion reply, APA 7 citations |
| School | Walden University |
| Program | PhD in Public Health |
| Updated | October 2026 |
Free sample paper for PHLT 8034 Week 6
Week 6 Discussion: Response to a Classmate
Peer Critique: A Closed Landfill Upslope of Private Wells, and the Groundwater Link the Post Asserted but Never Showed
Response
Jordan wrote: "Leachate from the old county landfill is contaminating the private wells in the Pine Hollow neighborhood below it."
Jordan, your post establishes a lot, and I want to start there. The landfill exists and accepted mixed municipal and light industrial waste for decades before it closed, which you documented from the county's closure records. The neighborhood downhill relies entirely on private wells, which you confirmed from the permit map. And you are right that old unlined landfills produce leachate carrying dissolved organic matter, ammonia, metals and in some cases solvents, often for decades after closure (Kjeldsen et al., 2002). On the source and the receptors, your case is solid.
The claim I want to look at is the link between them, the one your final sentence states as fact. For leachate to reach those wells, three conditions have to hold. Groundwater beneath the landfill has to flow toward the neighborhood rather than in another direction. An aquifer, or connected fractures, has to join the zone under the landfill to the depth the wells draw from. And compounds associated with leachate have to show up in the wells themselves. Your post does not address any of the three, and the downhill position cannot stand in for the first. Groundwater moves from higher to lower hydraulic head, which often but not always follows the land surface; streams, pumping wells, buried valleys and the dip of rock layers can send it in directions the topography would never suggest (Freeze & Cherry, 1979). Without the second and third conditions, the claim rests on proximity alone.
What would settle it? Three kinds of evidence, any of which may already exist. A state geological survey or a consultant's closure report may describe the local hydrogeology and flow direction. Closed landfills often have monitoring wells around their perimeter, and their sampling records would show whether leachate indicators are leaving the site and in which direction. And household sampling of the neighborhood wells for indicators such as chloride, ammonia, specific conductance or volatile organic compounds would test the final link directly. Agency guidance for public health assessments treats a pathway as completed only when each element, from source to point of exposure, is supported by data (Agency for Toxic Substances and Disease Registry [ATSDR], 2005), which is the standard your conclusion currently skips.
None of this means you are wrong; the landfill may well be the source. My question is whether the county's closure file includes monitoring well data or a flow map. If it does, it could turn your strongest sentence from an assertion into a finding.
References
Agency for Toxic Substances and Disease Registry. (2005). Public health assessment guidance manual (update). U.S. Department of Health and Human Services.
Freeze, R. A., & Cherry, J. A. (1979). Groundwater. Prentice-Hall.
Kjeldsen, P., Barlaz, M. A., Rooker, A. P., Baun, A., Ledin, A., & Christensen, T. H. (2002). Present and long-term composition of MSW landfill leachate: A review. Critical Reviews in Environmental Science and Technology, 32(4), 297-336. https://doi.org/10.1080/10643380290813462
PHLT 8034 Week 6 instructions, in plain terms
The sixth discussion usually asks students to critique a classmate's environmental health claim. Faculty look for a reply that selects the most consequential weakness and holds the critique to it, rather than a list of everything the post could improve. Strong replies begin by conceding what the post established, which earns fairness credit and focuses the challenge. The core paragraph should state the claim in question, list the conditions it depends on and explain why each cannot simply be assumed. Suggesting evidence that could settle the question is more useful than asserting the opposite conclusion. A source should support the technical point, here how groundwater moves. Tone matters: the reply should leave room for the classmate to be right if the evidence turns up, and a closing question should invite that evidence.
How this PHLT 8034 Week 6 example is built
The reply opens with a quotation of the classmate's conclusion. A first paragraph concedes the landfill's history, the neighborhood's reliance on wells and the long-term character of leachate, citing a review of landfill leachate composition. A second paragraph isolates the asserted link and lists its three conditions, then explains with a groundwater text that flow follows hydraulic head, which topography does not always predict. A third paragraph suggests three kinds of evidence, hydrogeology in closure reports, perimeter monitoring well records and household sampling for indicators such as chloride and ammonia, and cites agency guidance that a pathway counts as complete only when each element is supported by data. The reply closes by noting that the landfill may well be the source and asking whether the closure file holds the needed records.
Where the marks sit in the PHLT 8034 Week 6 rubric
Choosing one link and holding the critique to it earns the top band. Replies that cover every weakness spread their force and rarely land on the claim that matters, here the unsupported groundwater connection. Concession is graded: disputing facts the post established reads as contrarian and forfeits fairness credit. The conditions paragraph carries the analytic weight, and it is only as strong as its explanation of why each condition cannot be assumed. Graders also reward accurate technical reasoning about groundwater and suggestions of evidence rather than counterclaims. A source tied to the specific point, and a respectful closing question, support the participation share. A reply that declares the landfill innocent would be making the same error in reverse, asserting a conclusion the evidence has not reached.
PHLT 8034 Week 6 help: mistakes that cost marks
Critiques fall short when they try to correct everything or simply disagree. Find the one claim that, if unsupported, undermines the post's conclusion. Concede what is established before you challenge anything. Then spell out what the disputed claim requires and why each requirement cannot be taken for granted, with a source for any technical point. Offer evidence that could resolve the question instead of asserting the opposite. Finish by asking the classmate whether that evidence exists. A peer critique of a classmate's post in your own section can be drafted on this model.
Get a PHLT 8034 Week 6 example written to your instructions
Paste the post you are replying to and the prompt and rubric; within 24-48h a critique comes back that concedes what the post established and presses on the one link it asserted, free on your first order. Site details stay as general as the original post, and nothing is claimed about a real location.
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PHLT 8034 Week 6 questions, answered
Could the landfill still be the source after all?
Possibly, and the reply never says otherwise. Its point is that the post asserted the connection without showing it, which is a claim about the argument rather than about the groundwater. If the classmate returns with flow data or sampling results, the link may well hold, and the thread will have done its work by making that evidence appear.
Should the critique cover every weak point in the post?
No. The sample picks the single most consequential gap and leaves smaller issues aside, because a reply that corrects everything reads as grading rather than discussion. Where the post has a second serious problem, a sentence can flag it for a later exchange. One link examined thoroughly usually earns more than five touched in passing.
Is hydrogeology expected knowledge in this course?
Only at the level of general principles: groundwater moves along gradients that topography does not always predict, and aquifers can be connected or separated by geology. The sample uses those principles to show what the post needed and cites a general source. Detailed site hydrogeology comes from published reports, which your reply can point to without interpreting them yourself.
Where can I find a free PHLT 8034 Week 6 sample paper?
This page reproduces the complete Week 6 peer critique, which concedes a classmate's source and receptors and questions the unsupported groundwater link between a landfill and private wells.
Why concede so much before raising the problem?
Conceding what the post established shows the critique is fair and narrows attention to the one claim that lacks support. Graders reward that balance, and classmates are more likely to engage with it.