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Home My WebLink AboutVI-10 - Approve Change Orders No. 1-7 - City Hall Masonry Restoration City Council Memorandum To: Mayor Hicks & City Councilmembers From: Justin Fortney, City Planner Date: November 5, 2018 Item: Approve Change Order #1-7 for the City Hall Masonry Restoration Council Action Requested: Council is requested to approve the attached change orders for the City Hall Masonry Restoration. These change orders add seven cost changes to the contract. The items are mostly related to additional masonry repair units. Background Information: The project manual produced by Collaborative Design Incorporated identified the general conditions of the building including areas of suspected damage and an estimate of unit numbers required for replacement. The contractors bid on the project on a per unit figure for each item with a lump sum based on the estimate. Below is a brief explanation of each item (numbers 2 and 3 were not used) some items were approved by staff due to either the timeline of the project or due to the long lead time to have the materials procured: 1. Stabilize the north window wells, which were not poured to the full depth of the foundation. Form and fill with concrete a portion of the foundation that was only made up of dry stacked rubble (related to the removal of the old abutting County Jail) $2,564.50 (staff approved and work completed) 4. Foundation stone replication. At the location of where the old County Jail abutted the building (SE corner) there was a large concrete patch. This was not included in the project because the architect considered this a previous repair. When the foundation underneath was uncovered and found the dry stacked rubble (Change order 1) it was determined the patch was not only unsightly, but possibly inadequately supporting the building. These three foundation stones are large with a long lead time. The contractor went to multiple sources to find the lowest price for the similar type of stone. $4,488.45 (staff approved and stone is on order) 5. Waterproofing product substitution. The specs called for a certain product, but when the waterproofing subcontractor inspected the uncovered foundation and how uneven the surface was due to the nature of the stacked stone, he recommended an alternate product that would work better on that surface. The architect agreed and found it was also a less costly product leading to a deduction in our favor. - $3,000 (staff approved and work completed) 6. The limestone features were mostly deeper than the specifications stated. From the attic the depth of stoned were measures between 4-6 inches in depth. Once the contractor started pulling a few stones, they determined many went as deep as 8 inches. Unfortunately, they cannot pull all the stones and order specific lengths VI-10 because much of the stone is holding up other stones and or brick. During the long lead time there could be a loss of materials from the building and water infiltration. The stones had to be reordered at maximum depth and cut on site to fit each opening. Backfilling the stones was not an option because the stones are not anchored, they are only held by their depth into the building. This was a high amount, due to the quarrying and cutting of stone being one of the most costly portions of the project. $6,269.80 (staff approved and stone on order) 7. Install a sidewalk at the rear of the City Council Chambers. There have long been plans to build a sidewalk here and the contractor provided a good bid when the sidewalks were being replaced from the foundation excavation. $2,300.00 (staff approved and work completed) 8. Annex tuck-pointing overage. The specs said there were 1,500 linear feet of type 1 joints to be cut and tuck-pointed. Type 1 being mortar detached on both sides and or cracking. The contractor kept assuring us they were way under the allotted 1,500 LF. They and the architect counted what had been cut and found they were over by 768 LF at a unit cost of $12/ foot. They submitted for a charge of $9,216 because they cut all type 1 joints as specified. Staff said only 1,500 LF was estimated and we needed to approve anything over the estimate. They said the joints were in poor shape and needed to be tuck-pointed, but should have kept better track of progress. They offered to split the difference and only charge $6/ foot for the overage. $4,608.00 (the work has been completed) the specs did say all type 1 joints were to be tuck-pointed and the architect was confirming only poor joints were being cut. This was a tracking error that likely saved the city money. 9. Additional brick replacement. There were slightly more bricks required than specified. The area near the Chamber emergency exit is heavily stained from an old drain pipe. The staining hid the damage to about 50 bricks needing replacement. Another 100 bricks are spread around the building. $1,500.00 (The work has not been authorized or completed). Financial Impact: The total value of these change orders is $19,480.75, which is about a 4.1% increase to the original contract amount. The City has been awarded a Capital Improvement grant from the Minnesota Historical Society for $212,187 for this project. There may be future deductions for stone replacement and historic brick repointing at the end of the project (around Thanksgiving). VI-10 Change Order Summary (*Dates are based on when the change order was sent to the architect for review) Advisory Commission Discussion: N/A Council Committee Discussion: N/A Attachments: • Photographs • Change Orders Change Order Date Item Estimated addition 1 October 29 Concrete infill on all norther window wells and patching $2,564.50 4 October 11 Replicate 3 foundation stone $4,488.45 5 October 10 Alternate waterproofing credit -$3,000.00 6 October 15 Stone depth increase $6,269.80 7 October 18 Add new sidewalk $2,300.00 8 October 29 Annex tuck-pointing – additional units at 50% discount $4,608.00 9 October 29 Additional brick replacement 150 at $15/ each $2,250.00 Net Total Increase/Decrease to date Original Contract Value Change Orders as Percentage of Contract Value to date $19,480.75 $471,434.00 4.1% VI-10 VI-10 16264 Lakeside Ave SE, Prior Lake, MN 55372 Hastings City Hall Masonry Repairs Hastings, Minnesota Project No. 18013.00 Change Order Request No. 1 - Pour concrete under window wells where soil has fallen away due to excavation for waterproofing. Patch SE foundation corner with concrete. October 29, 2018 Description:Quantity:Unit:Unit Cost:Total: Form & Pour Concrete - Labor 24 HR $70.00 $1,680.00 Form & Pour Concrete - Materials & Equipment 1 LS $550.00 $550.00 Markup (O&P)15 %$2,230.00 $334.50 Total:$2,564.50 VI-10 V I - 1 0 16264 Lakeside Ave SE, Prior Lake, MN 55372 Hastings City Hall Masonry Repairs Hastings, Minnesota Project No. 18013.00 Change Order Request No. 5 - Use Bentonite Waterproofing System in lieu of Specified October 10, 2018 Description:Quantity:Unit:Unit Cost:Total: Subcontract - Technical Waterproofing Solutions 1 LS -$3,000.00 -$3,000.00 Total:($3,000.00) VI-10 16264 Lakeside Ave SE, Prior Lake, MN 55372 Hastings City Hall Masonry Repairs Hastings, Minnesota Project No. 18013.00 Change Order Request No. 4 - Stone Pieces Depth Increase from 4"-6" per Addendum No. 1 to 8" Actual. October 15, 2018 Description:Total: Remove and Set Stone (additional depth) - Labor $2,100.00 Stone Materials (additional depth) - Quarra Stone $3,352.00 Markup (O&P)$817.80 Total:$6,269.80 VI-10 16264 Lakeside Ave SE, Prior Lake, MN 55372 Hastings City Hall Masonry Repairs Hastings, Minnesota Project No. 18013.00 Change Order Request No. 7 - Add sidewalk between stair and sidewalk and south side per attached email & drawing. October 18, 2018 Description:Total: Subcontract - Preferred 1 Construction $2,000.00 Markup (O&P)$300.00 Total:$2,300.00 VI-10 16264 Lakeside Ave SE, Prior Lake, MN 55372 Hastings City Hall Masonry Repairs Hastings, Minnesota Project No. 18013.00 Change Order Request No. 8 - Annex Building Tuckpointing Overage October 29, 2018 Description:Quantity:Unit:Unit Cost:Total: Annex Building Tuckpointing Overage (2,268lf actual vs 1,500lf allowance in bid)768 LF $6.00 $4,608.00 Total:$4,608.00 VI-10 16264 Lakeside Ave SE, Prior Lake, MN 55372 Hastings City Hall Masonry Repairs Hastings, Minnesota Project No. 18013.00 Change Order Request No. 9 - Historic Building Proposed Brick Replacement Overage October 29, 2018 Description:Quantity:Unit:Unit Cost:Total: Historic building proposed brick replacement overage (1,100ea proposed vs 1,000ea allowance)150 EA $15.00 $2,250.00 Total:$2,250.00 VI-10