Change Order No 1 - 2019 Small Drainage Project No 119-019A - Selge Construction Co Inc

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INTER -OFFICE MEMORANDUM DEPARTMENT OF PUBLIC WORKS DIVISION OF ENGINEERING TO: Linda M. Martin, Clerk Board of Public Works FROM: Sue Ellen Doudrick SUBJECT: 2019 Small Drainage (La rop) Change Order for Project No. 119-019A exceeding 20% DATE: July 10, 2019 This project began as a resident notifying the City of a drainage issues on Lathrop. During high intensity rainfall events the street would flood, and at times, the ponded water in the street made its way north thru yards, garages, and even to homes. Several issues were identified in the area: catch basins and sewers filled will debris as a result of an eroding bank, undersized sewers, steeply sloped streets and low capacity catch basins. To tackle some of the issues in the area, several departments helped, which included: 1) upgrading catch basins at Parkview Place and Lathrop, providing structures for contracted work, and providing the trucks and hauling away contractor's excavated materials by Sewer Department ' e artment' 2) removing years of dumped materials (approximately 10 truckloads) on the sloped bank between the northern portion of the alley by Code Enforcement, who also uncovered a sidewalk we did not know existed, and 3) planned milling and paving on Lathrop from Riverside Drive to Park View Place by Streets Department. 4) Tree removals by Brent Thompson, City Forester. Engineering took on a project which consisted of constructing a road side channel along the south side of Lathrop between Parkview place and the west east towards Riverside Drive, uncovering a manhole under the sloped bank, and placing geotextile on riprap on the bank to prevent erosion. During construction, unforeseen issues arose. The Contractor, Selge Construction, performed necessary additional work on the 2019 Small Drainage (Lathrop) Project #119-019A which added $11,840.40 (47.8%) to the original project ($24,765.00). Total cost is now $36,605.40. The unforeseen issues included: 1) During the excavating and grading of the slope the manhole was not found. The investigative search for the manhole included excavation, prodding, measuring, video inspection, GIS locating, and coordination with Sewer Department. The investigation for the manhole took several days, which the City agreed was beyond the intent of the project, and time and materials were tracked for the additional effort. When the Contractor uncovered the manhole under the slope, it was deeper than anticipated, approximately 6 feet. SAPublic; Works`Prgiects\Prgieets by Year\2019 Proiects\ 1 19-019A 2019 Small Drainage\4 - Construction\t - Agenda Requests and Change Chders\Change Order 1 Merno.doex