![]() This means that acquiring a spinlock is a "busy" operation that possibly burns CPU cycles for a long time (maybe forever!) while it effectively achieves "nothing". It works by repeatedly querying and/or modifying a memory location, usually in an atomic manner. Insofar, one can consider a lock a special case of a semaphore with a maximum value of 1.Īs stated above, a spinlock is a lock, and therefore a mutual exclusion (strictly 1 to 1) mechanism. Usually, this means code that modifies some data shared by several threads.Ī semaphore has a counter and will allow itself being acquired by one or several threads, depending on what value you post to it, and (in some implementations) depending on what its maximum allowable value is. Usually, but not necessarily, spinlocks are only valid within one process whereas semaphores can be used to synchronize between different processes, too.Ī lock works for mutual exclusion, that is one thread at a time can acquire the lock and proceed with a "critical section" of code. A semaphore is a generalization of a lock (or, the other way around, a lock is a special case of a semaphore). Spinlock and semaphore differ mainly in four things:Ī spinlock is one possible implementation of a lock, namely one that is implemented by busy waiting ("spinning"). For more information about EPA Region 2, visit our website. Superfund site profile pageįollow EPA Region 2 on Twitter and visit our Facebook page. įor additional background and to see the proposed cleanup plan, visit the Monitor Devices, Inc./Intercircuits, Inc. Environmental Protection Agency, 290 Broadway – 19th Floor, New York, NY 10007, Email. Written comments on the proposed plan may be mailed or emailed to David Montoya, Remedial Project Manager, U.S. EPA will monitor the groundwater for several years after the cleanup goals have been met to demonstrate that the groundwater is no longer a source of contamination. Samples of the groundwater will be collected and analyzed to ensure that the technology is effective. This method involves constructing a filtering wall underground that will capture and destroy the 1,4-dioxane contamination as it flows through the ground. The new cleanup plan, announced today, proposes to remove 1,4-dioxane from the groundwater with a method called in-situ chemical oxidation using permeable reactive barriers. However, this method does not work for 1,4-dioxane, which EPA discovered at the site in 2010 during the cleanup process. EPA started this cleanup in 2010 and will continue it until cleanup goals are achieved, which it expects will be in 2024. This method involves injecting non-hazardous additives into the groundwater that help bacteria degrade the VOCs. ![]() In 2005, EPA chose a cleanup method called in-situ bioremediation to break down the VOCs in the groundwater. 1,4-dioxane can increase the risk of cancer. VOCs can cause health problems such as headaches, nausea, and liver damage. The plating processes used chemicals that polluted the groundwater with volatile organic compounds (VOCs) and 1,4-dioxane. The Monitor Devices/Intercircuits site is the former location of a manufacturing facility that produced and assembled printed circuit boards from 1977 to 1980. We encourage the public to join our meeting, ask questions and share their views on the proposed plan.” “EPA’s proposed plan for the Monitor Devices/Intercircuits site will address the 1,4-dioxane contamination in the groundwater. “Community engagement and feedback is a key part of EPA’s process as we work to select a cleanup plan at this Superfund site,” said Regional Administrator Lisa F. EPA will host a public meeting at Wall Township Branch of the Monmouth County Library, 2700 Allaire Rd, Wall Township, NJ 07719 on Thursday, May 25, 2023, at 6:30 p.m. A 30-day public comment period for the proposed plan begins May 11, 2023. Superfund site in Wall Township, New Jersey. Environmental Protection Agency (EPA) is seeking public input on its proposed cleanup plan to use a process called chemical oxidation to address recently discovered 1,4 dioxane groundwater contamination at the Monitor Devices, Inc./Intercircuits, Inc.
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