Navigating Miami-Dade DERM Comment Sheets: A Civil Engineer’s Guide
A guide for developers and engineers on effectively reviewing and responding to comment sheets from Miami-Dade’s Department of Environmental Resources Management (DERM) for land development projects.
The Role of DERM in Miami-Dade County Land Development
DERM serves as the primary environmental protection and regulatory agency for Miami-Dade County, with a broad jurisdiction established under Chapter 24 of the County Code. Their review process is designed to safeguard the region’s unique and sensitive natural resources. Unlike other jurisdictions, DERM’s oversight extends beyond typical stormwater concerns to include a host of highly localized environmental issues. A Professional Engineer must be well-versed in these specific requirements to secure approvals. Key areas of DERM’s review include stormwater management to control flooding and protect water quality, the protection of public potable water supply wells through stringent wellfield protection ordinances, preservation of tree canopy and Natural Forest Communities (NFCs), and the assessment and remediation of contaminated sites. Their comments often involve intricate calculations, detailed site-specific analysis, and strict adherence to both County and State environmental standards, requiring deep expertise in civil engineering and environmental science.
First Steps: Deconstructing the DERM Comment Sheet
Common DERM Comment Categories and Response Strategies
| Comment Category | Common Issue Example | Recommended Response Action |
|---|---|---|
| Stormwater Management | Water quality treatment volume calculation does not meet Chapter 24 requirements. | Recalculate treatment volumes per the code, update drainage calculations and plans, and provide a narrative explaining the correction. |
| Wellfield Protection | Proposed use (e.g., gas station) is prohibited or restricted within the specific wellfield protection zone. | Verify the zone and restrictions. If prohibited, a site redesign or variance is required. If restricted, provide detailed plans showing all required protective measures (e.g., secondary containment). |
| Tree Preservation/Canopy | Tree survey is incomplete or does not accurately reflect existing canopy coverage. | Commission a new, certified tree survey. Recalculate canopy coverage and update the site and landscape plans to reflect accurate data and meet mitigation requirements. |
| Contamination/Remediation | A potential source of contamination was identified, but no Phase II Environmental Site Assessment was provided. | Engage an environmental consultant to perform a Phase II ESA. Submit the report to DERM and incorporate any required remediation or monitoring into the site development plans. |
| Administrative/Completeness | Application forms are missing signatures, or the required fee has not been paid. | Review the submittal checklist carefully. Provide the corrected and fully executed forms and proof of payment with the response package. |
| Utility Service (Sewer/Water) | No letter of capacity from the Miami-Dade Water and Sewer Department (WASD) was included for a proposed sewer connection. | Formally request a capacity evaluation from WASD. Include the official confirmation letter in the response package to demonstrate service availability. |
The initial step upon receiving a DERM comment sheet is a thorough and systematic review. Avoid the temptation to immediately start revising plans. Instead, the project team, including your Civil Engineer near me, should convene to deconstruct the document. We recommend categorizing each comment to better manage the response process. Categories might include Administrative (e.g., missing forms, incorrect fees), Technical-Stormwater, Technical-Environmental (e.g., contamination, wellfields), and Legal/Platting issues. For each comment, it’s critical to understand the underlying regulatory driver. Is the reviewer citing a specific section of Chapter 24, the SFWMD Basis of Review, or another applicable code? This contextual understanding is vital for crafting a precise and effective response. This initial analysis phase helps in allocating resources, identifying potential design challenges, and formulating a clear strategy for the permit submittals. A clear understanding of the agency review process prevents unnecessary back-and-forth and accelerates the approval timeline.
Addressing Stormwater Management and Drainage Comments
Stormwater management is a cornerstone of DERM’s review process. Comments in this category frequently focus on the adequacy of the proposed drainage design to meet both water quantity (flood control) and water quality treatment requirements. Reviewers will scrutinize calculations for pre- and post-development runoff rates, the design of retention/detention systems, and the demonstration of a positive legal outfall for the site’s drainage system. Common technical comments may question the soil percolation rates used in exfiltration trench design, the pollutant removal efficiency of the selected Best Management Practices (BMPs), or compliance with sea-level rise considerations for outfall structures. Responding effectively requires not just revised calculations but often a detailed narrative explaining the engineering methodology. As experienced Civil Engineers, we ensure that every aspect of the stormwater management plan is robustly documented and defensible, meeting all criteria for environmental resource permits.
Navigating Wellfield Protection and Contamination Comments
Miami-Dade County’s groundwater is a primary source of drinking water, and DERM’s wellfield protection ordinance is one of the most stringent in the nation. If your project falls within a designated wellfield protection zone, expect detailed comments regarding land use restrictions, hazardous material storage, and groundwater monitoring. Comments may require the submission of an environmental site assessment (Phase I or II) to rule out existing contamination. If contamination is found, DERM will require a comprehensive remediation action plan. Responses to these comments must be meticulously prepared, often in coordination with a specialized environmental consultant. The design must demonstrate that all potential pathways for contamination are eliminated. This includes specifying secondary containment for fuel tanks, designing sealed drainage systems in high-risk areas, and ensuring proper abandonment of any existing wells. This level of scrutiny underscores the importance of early-stage due diligence and expert site engineering services.
Tree Preservation and Natural Forest Community (NFC) Compliance
DERM is also responsible for enforcing the county’s tree preservation ordinance. Comments often relate to the accuracy of the tree survey, calculations for existing and proposed tree canopy coverage, and the proposed mitigation for tree removal. If a project site contains or is adjacent to a designated Natural Forest Community (NFC), the level of scrutiny increases dramatically. DERM will issue comments to ensure the proposed development does not adversely impact the NFC’s ecological integrity. A successful response requires a detailed tree permit application, a clear site plan showing all trees to be removed and preserved, and a comprehensive landscape plan detailing replacement trees. The response must demonstrate full compliance with canopy coverage requirements. In sensitive areas, this may involve redesigning the site layout to increase preservation, a process where an experienced civil engineering team can provide significant value by balancing development goals with regulatory constraints.
Utility and Infrastructure Coordination Comments
DERM’s review extends to critical infrastructure, particularly sanitary sewer and potable water systems. Comments in this area often focus on ensuring adequate capacity in the existing public systems to serve the new development. For projects proposing new sewer extensions, DERM will require confirmation of downstream capacity from the Miami-Dade Water and Sewer Department (WASD). This requires proactive utility coordination early in the design process. For sites not served by public sewer, DERM regulates the design and installation of septic system design, with increasingly strict rules aimed at protecting groundwater. Comments may question soil suitability, drainfield sizing, and setbacks from wells or surface waters. A complete response must include detailed design plans, soil percolation test results (a form of Soil Test), and calculations demonstrating compliance with all applicable health and environmental codes.
Our Process: How RSP Engineers Streamlines DERM Responses
At RSP Engineers, we employ a structured and proactive process for managing DERM comment responses. Upon receipt, our project manager immediately distributes the comment sheet to our internal team of Florida Licensed Engineers. Each comment is assigned to the appropriate technical expert—whether in drainage, utilities, or environmental compliance. We then schedule a strategy meeting with the client to discuss the comments, propose solutions, and outline any potential impacts on the project’s scope, budget, or timeline. Our response package is always clear, concise, and professional. It includes a point-by-point response letter that directly addresses each of DERM’s comments, referencing the exact location of revisions on the plans and in the supporting documents. We believe in proactive communication and will often contact the DERM reviewer to clarify any ambiguous comments before finalizing our response. This collaborative approach minimizes review cycles and builds a positive working relationship with the agency, facilitating a smoother path to permit submittals and approval.
Common Pitfalls to Avoid When Responding to DERM
Navigating the DERM review process can be challenging, and several common pitfalls can lead to delays. One of the most frequent is submitting an incomplete response that fails to address every single comment. Even a minor administrative oversight can result in the entire package being rejected. Another issue is misinterpreting the intent of a comment, leading to a response that, while technically accurate, doesn’t satisfy the reviewer’s underlying concern. This is where the experience of a seasoned civil engineering team is invaluable. Providing insufficient supporting documentation is another major pitfall. If a comment questions a calculation, the response must include the revised calculation sheets, updated plans, and a clear narrative. Finally, adopting a confrontational tone in the response letter is always counterproductive. A professional, collaborative, and solution-oriented approach is essential for successfully navigating the agency review process and achieving your project goals.
Partner with RSP Engineers for Your Miami-Dade Project
Successfully navigating the Miami-Dade DERM review process requires technical excellence, regulatory knowledge, and strategic communication. The team at RSP Engineers has extensive experience managing complex permitting and site development projects throughout South Florida. We provide the expert civil engineering services needed to interpret agency comments, develop effective solutions, and prepare response packages that lead to timely approvals. Don’t let regulatory hurdles derail your project. Contact us today to discuss how we can assist with your next agency review and ensure your project’s success.
Conclusion: Turning DERM Comments into Project Approvals
A comment sheet from Miami-Dade DERM is not an obstacle but a critical part of the collaborative process to ensure responsible development. By adopting a systematic approach, leveraging deep technical expertise, and maintaining clear, professional communication, developers can efficiently address regulatory feedback and move their projects forward. An experienced civil engineering partner is essential in this process, transforming complex comments into an approved set of plans. Ultimately, a successful response paves the way for a compliant, resilient, and valuable project, underscoring the importance of diligent environmental permitting and thoughtful land development.
FAQs
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Review times can vary based on project complexity and the agency’s workload. Generally, an initial review can take anywhere from 30 to 90 days. Each subsequent review cycle following a resubmittal is typically shorter, but a comprehensive and accurate initial permit submittals package is the best way to minimize the overall timeline.
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A comment typically points out a specific deficiency or non-compliance issue that requires a correction in the plans or calculations. An RAI is broader and is issued when the reviewer needs more information to even begin or complete their review. An RAI often precedes a full comment letter if the initial submittal is deemed insufficient for a detailed agency review.
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Yes, in many cases, DERM reviewers are open to pre-response meetings, especially for complex projects or particularly challenging comments. As your engineering consultant, we can facilitate and lead these meetings to ensure a productive discussion and gain clarity on the path to approval. This is a key part of effective agency coordination.