Response to RFI No. 10 As of 14-Jul-2010 1:29 PM CT Vitruvian Infrastructure Phase 1C Park 4010 Marsh Lane Addison, Texas 75001 Project Number: 1308C Status: Outstanding Overdue Subject HOT! Interior Piers at Wildlife Observation Deck Reason Code None Question The piers under the drip line that require low clearance drilling have water coming into the holes requiring casing. There is no good way to get the casing installed under the branches and insert into the hole without damage to the trees. Slurry casing would result in large amount of bentonite coming out of the hole each time a shaft is poured that could possibly affect the tree. Proposed Solution Change this to a shorter shaft that stays above the waterline and use a belled pier. We propose a 8' deep 12" diameter pier with a 30" diameter bell on the bottom. This would remove the need for casing. If future ground movement were a concern, we could use an adjustable shoe between the deck beam and the shaft. If movement did occur in the future, the deck could be leveled back out. See attached. Attached Files Adjustable deck bracket.pdf Section: 3 - Concrete Int. Tracking #: Days Elapsed: 34 From: Jennifer Haynes Originated: 10-Jun-2010 11:33 AM CT To: Eric Little (First Recipient) Requested By: 13-Jun-2010 12:00 AM CT (Original 13-Jun-2010 11:09 AM CT) Copy to: Victor Lissiak III Robyn Jacobson Nick Jacob Wade Geistweidt Mark Gaines Bruce Dunne Clay Barnett Additional Info Proposed Solution Impact Critical Path? Yes Cost Change: Yes, may be Time Change: None Discipline Code: Structural Drawing Numbers: SP310, SP312 Needs Drawing Change? N/A History (Chronological Order) Type Routed Billable n/a Memo Victor - This is routed for your review and response. Attached Files (none) From: Eric Little Sent: 15-Jun-2010 8:45 AM CT To: Victor Lissiak III Requested By: 13-Jun-2010 11:09 AM CT Copy to: Slade Strickland Brad Rusk Ron Lee Brian LaFoy Robyn Jacobson Nick Jacob Jennifer Haynes Bruce Dunne Clay Barnett Type Routed Billable n/a Memo Victor, We are in dire need of an answer on this belled pier question. Eric Attached Files (none) From: Eric Little Sent: 16-Jun-2010 2:21 PM CT To: Victor Lissiak III Requested By: 13-Jun-2010 11:09 AM CT Copy to: Nick Jacob Jennifer Haynes Type Response Billable n/a Memo Assuming you intend to utilize the pvc pipe barrier, that should provide enough of a seal to control water intrusion. It won't be as good as a seamless steel casing, but it will be good enough. Any water that accumulates in the hole prior to filling with concrete will be displaced out the top of the pier hole when the concrete is placed. It will be a little messy, but there will be no adverse structural effects. Attached Files (none) From: Victor Lissiak III Sent: 16-Jun-2010 2:44 PM CT To: Eric Little Requested By: 13-Jun-2010 12:00 AM CT Copy to: Eric Little Nick Jacob Jennifer Haynes Wade Geistweidt Type Routed Billable n/a Memo Due to the amount of water being encountered while drilling, it does no seem like this is a viable option. When only the PVC casing is used, the driller has punctured holes in the PVC allowing water to fill the shaft up to 21 feet. Not to mention, with the sensitivity to the ground within the dripline of the tree, the "mess" would cause quite a stir with the parks department. So, I ask again. May we use bell piers in lieu of steel casing? Attached Files (none) From: Jennifer Haynes Sent: 16-Jun-2010 3:45 PM CT To: Victor Lissiak III Requested By: 13-Jun-2010 12:00 AM CT Copy to: Eric Little Nick Jacob Wade Geistweidt Type Response Billable n/a Memo At what level below existing grade are you making water? Under-reamed piers need to be founded at about 15' below existing grade and the bell needs to be in the dry. If that works and the water table is low enough we will give you a conversion. Attached Files (none) From: Victor Lissiak III Sent: 16-Jun-2010 3:53 PM CT To: Jennifer Haynes Requested By: 13-Jun-2010 12:00 AM CT Copy to: Eric Little Nick Jacob Wade Geistweidt Type Response Billable n/a Memo Attached is the underream detail. Attached Files SKS-01.pdf From: Jennifer Haynes Sent: 8-Jul-2010 7:53 AM CT To: Victor Lissiak III Requested By: 13-Jun-2010 12:00 AM CT Copy to: Joel Massey Eric Little Nick Jacob Wade Geistweidt Clay Barnett Type Routed Billable n/a Memo We have provided the contractor with all of the information they requested. Attached Files (none) From: Victor Lissiak III Sent: 14-Jul-2010 1:29 PM CT To: Nick Jacob Requested By: 13-Jun-2010 12:00 AM CT Copy to: Eric Little Jennifer Haynes Wade Geistweidt Bruce Dunne Clay Barnett Final Response (Closing) This item is still open. No final response to display. .................................................................................. Copyright (c) 1999-2010, Systemates, Inc. View the User Agreement for legal restrictions and terms of use applicable to this site. Use of this site signifies your agreement to the terms of use specified in the User Agreement. Projectmates - The Capital Project Management Software