Turbidity and Dewatering

Learner Workbook - Turbidity Sampling and Dewatering Compliance

Field Practical Assignment - Turbidity Sampling and Dewatering Compliance

Links

Regulatory & Permit Portals

• FDEP Construction with Dewatering FAQ: It specifically addresses how to handle groundwater dewatering under the Florida Construction Generic Permit (CGP) and clarifies when a site is considered "contaminated."
• EPA Construction General Permit (CGP) Hub: This serves as the federal foundation for stormwater compliance. It includes the 2026 MSGP (Multi-Sector General Permit) fact sheets and updates regarding "indicator monitoring" for emerging pollutants.
• FDEP Business Portal: Useful for a "how-to" module. Learners can see where to file a Notice of Intent (NOI) or use the self-service tools for permit coverage.

Technical Manuals & BMP Standards

• Wyoming Department of Environmental Quality (DEQ): This Wyoming Department of Environmental Quality (DEQ) resource is specialized, focusing on Short Term Sediment Disturbance and the specific process for obtaining Turbidity Waivers.
• FDOT Design Manual (2026 Edition) Chapter 251 (Stormwater Runoff Control Concept): This outlines the latest conceptual layouts for temporary erosion and sediment control required for Florida Department of Transportation projects.
• EPA Turbidity Benchmark Monitoring Guide: A practical resource for explaining why turbidity is the chosen metric and how to conduct benchmark monitoring (specifically the 50 NTU threshold for sensitive waters).

Inspection & Mapping Tools

• EPA's Stormwater Discharge Mapping Tools: An online resource used to identify receiving waters and evaluate their water quality status.

  It helps users determine whether nearby waters are impaired, identify applicable Total Maximum Daily Loads (TMDLs), and assess pollutant concerns such as sediment, turbidity, and nutrients (nitrogen and phosphorus).

  This information supports informed decision-making to ensure stormwater discharges are managed in accordance with regulatory requirements.

• FDEP Map Direct - Contamination Locator Map (CLM): Compliance requires operators to check if their site is within 500 feet of a known contaminated area; this map is how they do it.

Industry Standards for Materials

EPA Field Turbidity Measurement: This resource is a Standard Operating Procedure (SOP) from the EPA’s Laboratory Services and Applied Science Division (LSASD). It provides the technical framework for performing field turbidity measurements using portable turbidity meters, ensuring that the data collected is accurate and defensible.

Key components of this document include:

• Standardized Methodology: It outlines the exact steps for collecting samples and using portable meters to get a reading, which is essential for maintaining consistency across different sites and operators.
• Quality Control & Calibration: There is a heavy focus on equipment calibration, verification, and maintenance. It provides specific instructions on how to use primary and secondary standards to ensure a meter is reading correctly before field use.
• Documentation Requirements: It details the necessary record-keeping for field activities, which is a critical part of any environmental compliance program.
• Technical Accuracy: Because it is an official EPA procedure (specifically version LSASDPROC-103-R6), it is often cited as the "gold standard" for field sampling protocols.

This is an excellent technical reference for environmental professionals, field technicians, or compliance officers who need to establish or follow precise, high-quality field measurement protocols that meet federal standards.