Agenda Report No. II-9c and Change Order

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Agenda Item No. II-9c

City of Wichita

City Council Meeting

September 13, 2011

TO: Mayor and City Council

SUBJECT: Change Order No. 5- ASR Recharge Well Support (All Districts)

INITIATED BY: Department of Public Works & Utilities

AGENDA: Consent

Recommendation: Approve Change Order No. 5.

Background: On August 24, 2010, the City Council approved a contract with Dondlinger & SonsConstruction Co. to reconstruct existing water wells to serve the Aquifer Storage and Recovery Facility.After system testing, it was discovered that sand in old waterlines connecting the wells was pushed intoand filled two of the wells. A change order has been prepared to address the additional work needed to

remove the sand from the wells and retrofit the system to prevent a future occurrence.

Analysis: The additional work consists of redeveloping the two wells and installing testing taps on all 30wells in the area. Two sand testers will be acquired that can be attached to monitor each well system forsand infiltration.

Financial Considerations: The total cost of the additional work is $22,358, with the total paid by theWater Utility. The original contract amount is $15,893,500. This change order plus previous changeorders represents 0.26% of the original contract amount. Funding is available within the existing project budget.

Goal Impact: The project addresses the Efficient Infrastructure goal by providing a needed water supply.

Legal Considerations: The Law Department has approved the change order as to form. The changeorder amount is within the 25% of construction contract cost limit set by City Council policy.

Recommendation/Action: It is recommended that the City Council approve Change Order No. 5 andauthorize the necessary signatures.

Attachments: Change Order No. 5.



August 1, 2011

PUBLIC WORKS-ENGINEERING CHANGE ORDER

To: Dondlinger & Sons Construction Co. Project: W-549-011 Recharge Well Support

Facilities. ASR Bid Package G1

Change Order No.:1005 Project No.: 788011

Purchase Order No.: 030683 OCA No.:633969

CHARGE TO OCA No.:633969 PPN:788011

Please perform the following extra work at a cost not to exceed $ 22,358.00

Additional Work :Redevelop wells MR 43 and MR 45. Add Rossum sand testing taps to piping at all 30 wells locations.Purchase 2 Rossum Sand testers.

Reason for Additional Work :

Sand in the existing piping was pushed down into the new recharge wells when testing rechargecapability. It was not known that there was sand in the old existing pipelines at the time of the testing.

Sand was cleared from pipeline by a separate change order on a pipeline project.

To prevent future occurrence, staff recommends adding taps at all well locations to allow a connection fortesting equipment. Two sand testers will be purchased to periodically monitor sand at the 30 rechargesites. Fit and equip all 30 sites to alternately use the 2 testers.

Item Negot’d/Bid Qty Unit Price Extension1. Redevelop Wells (2) Negot’d 1 ls $15,888.00 $15,888.002. Install Test Taps Negot’d 30 ea $ 153.00 $ 4,590.00

3. Rossum Testers Negot’d 2 ea $ 940.00 $ 1,880.00TOTAL $22,358.00

Recommended By: Approved:

__________________________ ________ ________________________________ _______Dennis H. Sanders Date Stan Breitenbach, P.E. DateConstruction Admin Mgr. Special Projects Engineer

CIP Budget Amount: $26,500,000.00 Original Contract Amt.: $15,893,500.00

Consultant: RW Beck and Associates Current CO Amt.: $22,358.00

Total Exp. & Encum. To Date: $26,252,059.42 Amt. of Previous CO’s: $11,093.00

CO Amount: $22,358.00 Total of All CO’s: $33,451.00

Unencum. Bal. After CO: $225,582.58 % of Orig. Contract: .14%

Adjusted Contract Amt.: $15,926,951.00



Approved: Approved:

__________________________ ________ _______________________________ ________Contractor Date Jim Armour, P.E. Date

City Engineer

Approved:

__________________________ _________Alan King DateDirector of Public Works & Utilities

Approved as to Form: By Order of City Council:

___________________________ _________ ________________________________ ________

Gary Rebenstorf Date Carl Brewer DateDirector of Law Mayor

Attest: ________________________________City Clerk

Documents

Agenda Report No. II-9c and Change Order