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Home My WebLink About5D - Reconstruction of Wellhouse #3 MEETING DATE: AGENDA #: PREPARED BY: AGENDA ITEM: DECEMBER 7,1998 5D GREG ILKKA, DIRECTOR OF PUBLIC WORKS/CITY ENGINEER CONSIDER APPROVAL OF CHANGE ORDER NO. 1 TO THE CONTRACT FOR RECONSTRUCTION OF WELLHOUSE #3. DISCUSSION: HISTORY A contract for reconstruction of Well house #3 was approved by the City Council on April 6,1998, Construction has progressed on schedule, During the course of the construction process, changes have been identified which should be made to the contract. On November 13, 1998, (see attached memo) I advised the Council of Change Order which I recommend to : 1, Assure that electrical conduits are installed to meet our Well #4, Well #6 and SCADA needs, 2, Assure all safety requirements are met for sodium hypochlorite which we use as a disinfectant in lieu of chlorine. CURRENT CIRCUMSTANCES ., The contractor is making considerable progress on the wellhouse, Most if not all of the block work should be completed by the December 7th Council meeting. Because of the aggressive schedule which calls for completion of the wellhouse reconstruction by the end of December some of these changes needed to proceed in order to not delay the contractor. ISSUES The reasons for the Change Order are twofold. Conduit needed to be added so the building would be prepared for the wiring needed to serve the new Wells it will contain and the SCADA system ($380). The largest part of the Change Order ($8,738,00) is equipment we recognized needed to be added to the project for safety purposes in dealing with sodium hypochlorite. 162~<ma~e Creek Ave. S.E., Prior Lake, Minnesota 55372-1714 / Ph. (612) 447-4230 / Fax (612) 447-4245 AN EQUAL OPPORTUNITY EMPLOYER CONCLUSION Both changes are appropriate and recommended by staff. In retrospect we probably would have recognized the need for these changes earlier in the process if we had greater experience in wellhouse building construction and the requirements associated with sodium hypochlorite, FISCAL IMPACT: This change in contract cost totals $9,118.00. The engineer's estimate for the project was $403,000. Including this Change Order the anticipated project cost is $316,201 or 22% under the estimate, ALTERNATIVES: There are two altematives for the City Council to consider: 1. Approve Change Order No,1 to the contract for reconstruction of Wellhouse #3, 2. Deny this item and provide staff with direction. RECOMMENDED MOTION: Motion and second as part of the consent agenda to approve Change Order No, 1 to the contract for reconstruction of Wellhouse #3. REVIEWED BY: ~f u WIDCOIDOC ~., MEMORANDUM November 12, 1998 To: Frank Boyles, City Manager From: Greg IIkka, Director of Public Works/City Engineer (J1/Vrr.- Subj: RECONSTRUCTION OF WELLHOUSE #3 CONTRACT CHANGES During the Building Permit review of the subject project a number of building code related items came up that require additional work on the project. Most of these items are a result of code interpretation differences between our Building Department and our design consultant. The building permit was issued with these items as a condition of approval. While the consultants experience in other communities have not required these items, we feel they are prudent for our project. The required changes are outlined below and in further detail in the attached correspondence. Item 1: Item 2: Item 3: Item 4: Item 5: Larger chemical containment tubs. Unistrut shelf. Additional door in chemical room. Containment tub monitoring. Panic Hardware for chemical room double door. In addition, it has been identified that the installation of some additional electrical conduits at this time will facilitate the installation of our SCADA system as well as the addition of a future well. The estimated cost of this additional conduit is $380.00. The contractor's cost proposal for items 1,2,3 & 5 as shown in the attached is $7,873 (includes 4'x4' concrete apron). We still do not have a price on item 4. The consultant is recommending each of the changes, and Doug and I concur. While these items were identified early on and I have stressed the importance of getting Council approval prior to undertaking any of the work, the contractor has had difficulty obtaining prices from his subs. I have just received this pricing information. In an effort to get these moving forward they have provided prices on most of the work. I am afraid though that i~ order to avoid delay and potential claims for delay, some of the work might need to be undertaken prior to getting this issue before the City Council. I would therefore respectfully request your approval of the changed work with final pricing approval from the Council at the December 7th meeting, The Engineer's estimate on this project was $430,000. The contract is in the amount of $307,083.00. There have been no previous changes to the contract. This project is funded through the Trunk Reserve fund. BONESTROO ROSENE ANDERLIK if 6516361311 11/30/98 13:35 ~ :02/03 NO:837 Fax Transmission ft ""'1100 lID..... AndtI1Ik .. AaIQcI... r " "'.."".." Date: November 25. 1998 From: Ron LaFond Our File No: 58601 To: Greg IIkkB OrBanlzlltlon: City of Prior Lake Public Works Oept. Fax Number: 447-4245 Page. to Follow: 1 Orlglnsl Will Follow In Mall: Yes Subject: Well house No.3: Work Requests No.2 and 3 Remarks: Dear Greg. 1 . Work request no. 2 addressed the need for some additional electrical conduit. Below Is a summary of the additional conduit that I recommend be installed as part of the project. Conduit --'-'---0"(,,'2;; conciLiii' .,..- from SCP stubbed out of wellhouse 2. Three 1" conduits from SCP stubbed out of wellhouse 3. Two:JA," underfloor conduits from SCP to future pressure switches L_..'___.._~--. _.__ ,.............-........... . . . ........-..-..- ~"rpq'~ ~ CommtDl For Well No.4 Supervisory $70 Must be Installed to Control and Data Acquisition accommodate the upcoming Svstem (SCADA) SCAOAp!oj~.ct.___. ,.. ...,_,.._.,_,.. Spare conduits for future control $150 Could be installed later, but wiring for well no. 4 and future conduit would be visible on well nO.6 outside of buildinq. For future well no. 6 and for weir -'$1"60. . -eouia 'be .inslai,'sd later, but no. 4 if converted to pitless unit conduit would be surface mounted on ceiling down to TOUlr;'"' '..$380 . ..pre~~,lJre swltc.~~s. 2. See attached sheet for costs associated with work request no. 3. 3. The first table shows a cost of $10,291 to complete the work items. This cost assumes that we remain with polyethylene containment tubs. 4. The second table shows a cost of $8.738 assuming we use B concrete containment wallin lieu of the polyethylene tubs. This Is a savings of $1,500 over polyethylene containment. S. I think the concrete containment wall is a good Idea. However, I would like to confirm this with Doug Hartman. I need to call the Contractor on Monday to let him know which option we're going with. Sincerely, ~ ~ Bone.lroo. Roaene, Anderllk and Associates 2335 West Highway 36. St. Paul, MN 55113. Phone: 812.636.4600. Fax: 612-636-1311 City of Prior Lake Wellhouae No.3 Work Request 3 56601 A Added Cost m o z m (J) --j ;0 o o :;tl o (J) m z m ):> z o m ;0 r 1-4 '" ,. Original Concept for Work Request No. :] (polyethelene Containment Tubs) Item Larger Chemical Contailvnent Tubs UnistllJt SheMng System to, Supporting Chemical Feed Pumps Containment Monitoring Additional Single Metal Door Panic Hardware on Active leaf of ChernicoU Room Double Doors Comment $3.545.00 Three tubs total. $1,078.00 Needed for fluoride system only. $2.568.00 Send aJann to ..t' ~dors if leak. $2.240.00 Includes panic hardware. S860.00 .] a- \J1 ~ a- ll-! a- ~ lI-! ~ ~ To1aI = $10,291.00 2. Revised Concept for WDf1c. Request No.3 (Concrete Waf Containment) ... I Credit for De4eting Polyethylene Tubs as Designed Concrete Containment Wall Unistrut Shelving System for Suppomng Chemical Feed Pumps Containment Monitoring Additional Single Metal Door \ Panic HanIware on Adive leal of Chemical Room Double Doors Added Cost Con'IIn ""I ($2,087.00) Three tubs total. $3,765.00 Includes painting. $1,960.00 Needed for fluoride and h\ t' . ..: "Iorite. $2,000.00 Only two containmenl areas 10 monitor. $2,240.00 S860.00 ~ ~ ....... lI-! o ....... '-0 (Xl ~ lI-! . . lI-! \J1 Total = $8,738.00 C2l 1:\566\56601\weIIhouse3..u. .dUetioo worluequest3costs 11125198 . . o lI-! ....... o lI-! Z o . . (Xl lI-! "