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Change Order

West Edmonton Sanitary Sewer (WESS) Stage W1 Project Purchase Order R904389 M.A.P. Water and Sewer Services Ltd.

Recommendation:
That the value of the sole source contract R904389 (sanitary sewer installation by open cut method for WESS Stage W1) be increased from $1,500,000 to $1,970,000.

Report Summary

In accordance with City Administration Bylaw 12005, the Committee shall approve all requests for Sole Source Contracts over $250,000.

Report

·  On January 24, 2006, Transportation and Public Works Committee approved the award of a sole source contract for the construction of 300 metre long 1,200 mm diameter sanitary sewer installation by open cut method for $1.5 million.

·  The sole source contract was awarded to M.A.P. Water and Sewer Services Ltd. to install the sanitary sewer pipe from 199 Street/98 Avenue to the west side of Anthony Henday Drive.

·  The original estimate was based on using single-stage well-pointing for lowering the ground water table during open cut sewer installation.

·  Due to the unexpected higher underground water table, a 135 metre portion, west of Anthony Henday Drive could not be installed by open cut method without using two-stage well-pointing to lower the ground water table.

·  Due to the higher groundwater flow, two rows of wells are needed to extract the groundwater in order to prevent the trench from collapsing.

·  M.A.P. Water and Sewer Services Ltd.’s price for two-stage well-pointing is based on the unit rates submitted in February 2006.

·  The prices are reasonable and below the current market value.

·  M.A.P. Water and Sewer Services Ltd.’s past performance in WESS Stage W1 has demonstrated its ability to install pipe in unfavourable subsurface conditions.

Policy

This contract was awarded through a sole source purchase process and complies with Administrative Directive A1439 – Purchasing of Goods, Services and Construction.

Focus Area

Economic Development.

Budget/Financial Implications

Funding for this project is available in Project 04-23-9301 WESS Stage 1.

Justification of Recommendation
It is more cost effective, timely and efficient for the City to procure two-stage dewatering as a change order to the existing contract.

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