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Dewatering Permits – The Highlights

Dewatering Permits – The Highlights
Anytime water (groundwater or municipal water) is discharged to surface water or to a drain system that discharges to surface water without first running through a public or privately owned treatment works, an Environmental Protection Agency (EPA) permit is required. Surface water includes but is not limited to a river, lake, pond, or the ocean. A local permit from the town or city water and sewer commission is typically also required if the discharge is to a drain. The EPA permit program is called the National Pollutant Discharge Elimination System, or NPDES for short. There are three different permits which may be required for the types

Part 3: What LSPs need to know about Indoor Air AEPMMs

Part 3: What LSPs need to know about Indoor Air AEPMMs
As LSPs, we have all been there: your client’s site has an indoor air issue and you need a sub-slab depressurization system (SSDS), maybe it will need remote telemetry, or maybe it will pass a risk assessment. You want to call your local radon contractor to install the SSDS, like you have in the past, but you’re not sure that the system will be in compliance with the recent changes to the Massachusetts Contingency Plan (MCP) if telemetry is needed. You should know, telemetry or not, there are important differences between radon systems and MCP vapor intrusion systems that mitigate

Part 2: What do property owners need to know about indoor air AEPMMs?

Part 2: What do property owners need to know about indoor air AEPMMs?
There are multiple stages to installing an Active Exposure Pathway Mitigation Measure (AEPMM) to mitigate vapor intrusion conditions: engineering, installation, and maintenance. When looking to install an AEPMM to manage indoor air quality at your property, whether commercial or residential, we recommend choosing a company that has years of experience in all three areas of this process. A properly designed AEPMM will rely on data that is collected at your property; as not all buildings or sub-surfaces are the same, and transmissivity conditions are project specific.  The system’s main component, the blower(s), should be sized based on not only sub-slab

EPA’s 2017 National Pollutant Discharge Elimination System (NPDES) Remediation General Permit (RGP)

EPA’s 2017 National Pollutant Discharge Elimination System (NPDES) Remediation General Permit (RGP)
The new National Pollutant Discharge Elimination System (NPDES) Remediation General Permit (RGP), now called the General Permit for Remediation Activity Discharges (GP), is finally available, but what does this mean for you? If you are the owner or operator of an existing discharge, you can expect to hear from the Environmental Protection Agency (EPA) soon. Existing discharges will be required to file a Notice of Intent (NOI) with EPA if they intend to continue discharging for more than 90 days following the effective date of the permit, which is April 8, 2017. If you want to initiate a discharge, then

What is an Active Exposure Pathway Mitigation Measure (AEPMM)?

As we discussed in a previous blog post, recent changes to the Massachusetts Contingency Plan (MCP) have enabled sites with an active exposure pathway mitigation measure (AEPMM) to achieve a Permanent Solution with Conditions (PSC). They can also be used with Immediate Response Actions (IRAs), Release Abatement Measures (RAMs), Temporary Solutions, and in conjunction with a Remedy Operation Status (ROS). But what exactly is an AEPMM anyway? The term AEPMM covers any mechanical system that is used to prevent human exposure to “released” chemicals that are present at a Massachusetts Contingency Plan (MCP) site above established health risk thresholds. Most
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