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Old 03-07-2021, 08:36   #1
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Port of San Diego To Halt In-water Hull Cleaning Activities In SIYB This Winter

https://www.thelog.com/local/commiss...Gdvnggf26XE590
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Old 03-07-2021, 08:52   #2
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Re: Port of San Diego To Halt In-water Hull Cleaning Activities In SIYB This Winter

For shame boaters. We need to be educated (according to the quote in the article). Educate yourselves on how bottom cleaning is potentially a contributing factor to this particular body of water exceeding federal standards.... but not the other ones that fall within the standard and also have bottom cleaning occurring within them.

Silliness aside for a moment:

Related (and serious) question... how the heck is a body of water in California failing to meet federal standards in quality? Aren’t they among the thought leaders in sustainable practices, regulation, and environmentalism?
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Old 03-07-2021, 09:16   #3
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Re: Port of San Diego To Halt In-water Hull Cleaning Activities In SIYB This Winter

most certainly it is much better for environment & climate to burn considerably more fuel due to a fouled bottom than to have the fouling off, maybe with some of the (apparently wasted) antifouling...
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Old 03-07-2021, 10:44   #4
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Re: Port of San Diego To Halt In-water Hull Cleaning Activities In SIYB This Winter

In the past much of the copper in San Diego Bay has been supplied by the federal government, Navy ships use a copper (50-60%) ablative bottom paint. Here's first paragraph from a Navy study, rest has some eyeopeners also for those who care to wade thru such papers.
Quote:
Quote:
Copper is a nearly ubiquitous contaminant in Navy as well as industrial and urban discharges.
There are numerous copper sources, many with no clear engineering pollution control solutions.
From shore-based facilities, there are both point and nonpoint sources (e.g., shipyards and storm
drains). Ships themselves are sources of copper from antifouling coatings, in-water hull cleaning,
and liquid discharges (e.g., bilge, gray water, cooling water, etc.). An example of a source is
the release of copper from antifouling coatings, where the metal is released at approximately 17
Pig/cm 2/day, as measured from a dynamically exposed typical ablative copper coating. This release
rate would introduce approximately 7,200 kg of Cu per year into San Diego Bay from Navy vessels,
which is about 23% of the total estimated annual loading of copper into the bay.
https://apps.dtic.mil/dtic/tr/fulltext/u2/a356956.pdf
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