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Homestake Meeting Minutes, 07/14/16

Attending: Gary, Ross, Levi, Vuk, Daniel, Pat, Tanner

Agenda:

• Homestake array status
• RR cabling issue: probably rodent activity. Fix would most likely require replacing cables.
• WTP mass rail issue.
• Gary suspects that the platform has tilted in one direction, so that the instrument is not leveled any longer. We would probably need to have a spare sensor ready just in case though.
• Do we need a maintenance trip asap?
• Gary: Cost roughly $20 per station per day, so next 50 days would cost us$2000, which is about the same as the cost of a trip to fix these.
• Gary/Vuk: On the other hand, do we gain much from the extra 2 months of data from these 2 stations. Gary and Vuk feel that we do not, given how much data we already have. Others agree.
• Decide not to worry about these two stations, our next trip to Homestake will be to decommission the surface stations in September.
• Planning the September trip to remove surface stations:
• Vuk: have to leave each site in the state we found it. We have to extract the insulation from the vaults, and we have to remove the pole.
• Gary: The pole might be hard in some cases, in most cases just pulling one guy wire could do it (since they are shallow, may have to dig a bit). A couple of sites may be harder since they are deeper - for them, may have to dig more and maybe hit the concrete.
• Gary: could decommission up to 5 stations per day. But have to service the balers in parallel with this. And we have to check the orientation of the sensors, to get another data point.
• Also have to clean all of the equipment (remove mud etc), pack them into their boxes. We should ship them in December, along with all the underground equipment.
• We should allow a full week for at least 3 people: arrive on Sunday and leave on Friday or Saturday.
• Dates in September: Gary would prefer the second half of Sept. Pat OK. Daniel: weeks of Sep 19 and 26 are ok. Ross: will be taking classes, but could miss some. Vuk: teaching, but will try to join for at least a part of this trip.
• Pat: What about the tools at Homestake? let's take inventory in Sept, and decide what to leave in the lab and what to ship back to UMN in Dec.
• Week of Sep 26 looks like the best choice. Follow up via email, Vuk will check with the lab.
• Email from Jaret (after the meeting):
• Maintenance days: Sep 23,26 and Oct 7,10. The Lab also observes the Native American Day holiday on Oct 10.
• Tom's availability: Sep 24-26 (weekend), traveling say Fri Sep 23 (there is another group earlier that week and Tom needs to manage his hours). Also, week of Oct 3 looks good.