Tim,

What’s the depth of the deposits to be removed?

John Mark Joseph 

Sent from my iPhone

> On Nov 30, 2017, at 7:54 AM, ROBERT Neyland <[log in to unmask]> wrote:
> 
> Hello Tim. I would agree with you that a survey would be in order. The overlaying intrusive sands may have intermingled with cultural material laying on or above the bottom. I don’t know the specifics of the site but would think that the original lake floor would have some erosion and possible exposure of cultural material that could be then intermingled with the intrusive sand. I would also question if the original lake floor depth is consistent. IF they are a dredging to a prescribed depth that depth might not be consistent.
> 
> 
> 
> At the Navy we advise the USACE to survey areas that have been previously dredged because the previous dredging might not have completed removed any wrecks, especially if they are iron. Another consideration is if they are deepening a channel, cultural material on the slopes of the channel may be impacted and slide into the channel.
> 
> 
> 
> I am traveling at present and will not be back in US until next week but if you would like to discuss in more detail. I also copied two of our Underwater Archaeologists on this email. I am sure they would be glad to consider the problem.
> 
> 
> 
> Bob
> 
> 
> 
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
> 
> 
> 
> ________________________________
> From: HISTORICAL ARCHAEOLOGY <[log in to unmask]> on behalf of Timothy Scarlett <[log in to unmask]>
> Sent: Wednesday, November 29, 2017 4:40:48 PM
> To: [log in to unmask]
> Subject: hydraulic dredge effects
> 
> Hi all,
> 
> I had a conversation today with group of resource managers engaged in permitting a series of proposed dredging projects to remove massive mine tailings deposits on the beach and underwater in a great lake.
> 
> I was given the impression by these officials that crews working hydraulic dredges can remove the stamp sand without removing any of the underlying natural sand or sediment, which lead that manager to conclude that “no adverse effect” was a reasonable determination without requiring any survey. I find that conclusion hard to believe, but I am a terrestrial archaeologist with no expertise in this topic. It seems to me that the permitting process by the state DEQ and USACE should have at least required a survey and consideration of cultural resources.
> 
> I may be mistaken about general practice in maritime compliance practices.
> 
> The sands to be removed are secondary eroded deposits moved by the longshore current and they overlay natural sands and gravels that have never been dredged before (i.e. not in a shipping channel).
> 
> Can anyone comment on this? I would appreciate any advice on publications, technical reports, and agency guidelines that specifically examine or guide decisions regarding hydraulic and other dredge processes.
> 
> I have been reading USACE reports found through Google Scholar and books, but the vast majority of these are decisions of no adverse effect because the APE has been periodically dredged in the past, and the proposed project in maintenance dredging. I hope my colleagues can help me sift through this more quickly.
> 
> Thanks for any advice- please reply off or on list, as you wish.
> 
> Thanks,
> Tim Scarlett
> Michigan Technological University
> Houghton, Michigan
> 
> ############################
> 
> To unsubscribe from the HISTARCH list:
> write to: mailto:[log in to unmask]
> or click the following link:
> https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fcommunity.lsoft.com%2Fscripts%2Fwa-LSOFTDONATIONS.exe%3FSUBED1%3DHISTARCH%26A%3D1&data=02%7C01%7Crobertney%40MSN.COM%7Ceb53b9673d3048cb40f208d53771e16b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636475884605771440&sdata=UrSvv64Rh1fxb40hr9LCa4agS342pKzvmO%2BlBdPC6fw%3D&reserved=0
> 
> ############################
> 
> To unsubscribe from the HISTARCH list:
> write to: mailto:[log in to unmask]
> or click the following link:
> http://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?SUBED1=HISTARCH&A=1

############################

To unsubscribe from the HISTARCH list:
write to: mailto:[log in to unmask]
or click the following link:
http://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?SUBED1=HISTARCH&A=1