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MEMORANDUM To: David Cavazos City Manager Date: February 3, 2014 Edwin "William" Galvez Interim Executive Director From: Public Works Agency r' Project No. 13 -6780 2012 -13 Omnibus Concrete Replacement Contract t' Subject: Change Order No. 1 Contractor: Hardy & Harper, Inc, 1312 E. Warner Avenue . °r. co Santa Ana, CA 92705 Project Description: City -wide Concrete Replacement Change Order Number: 1 Change Order Total: $ 60,207.15 Accounting Unit - Account - Activity Number: 08510138 -62300 JUSTIFICATION On April 15, 2013, the County of Orange investigated and reported to the City a black substance discharging into the Santa Ana Gardens Channel at W. Myrtle Street. The City responded and coordinated an immediate cleanup utilizing the City's Spill Response Contractor and started the investigation to determine possible sources. Subsequently on May 2, 2013 and May 14, 2013, two similar discharges were reported. The City responded immediately to clean up the discharge and continue the investigation. After examining all of the potential sources, it was determined that the City Corporate Yard was responsible for the discharge; the drains in the dumpster area were connected directly into the site storm drain system. A change in the street sweeping activity at the City Yard caused water to leak from the dumpsters which were located directly above the storm drains. The City has taken temporary mitigation action to minimize the impacts, which includes plugging the drain pipe, cleaning the dumpster pit area and routinely pumping out nuisance flow from the junction structure prior to entering the public stormdrain system. To permanently mitigate this issue Design Engineering recommends installing pumps in the downstream junction structure to redirect all dry weather flows to the existing clarifier; which requires upgrading the electrical panel, system controller and additional above ground piping. EXTRA WORK - AGREED COST $ 60,207.15