R99-110 ACCEPTING THE BID AND AUTHORIZING A CONTRACT

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R "'� + , OF'�FC + h 9� � C V 70 ��9 '/[LINO�`' July 13, 1999 PUBLIC WORKS MEMORANDUM NO. 99 - 37 � MEMORANDUM TO: Honorable Mayor and City Council FROM: James L. Williams,Jr., City Manager Bruce A. McNabb, P. E., Director of Public Works Stephen P. Swanson, P. E., City Engineer� SUBJECT: Drainage Area 18 Improvements - Greenridge Drive City Project 9745 The neighborhood generally bounded by MacArthur Road on the west, Diane Road on the north, Greenridge Drive on the east and having a southerly boundary about 800 feet south of Diane Road experiences considerable drainage problems during heavy rainstorms. This area is about 40 acres in size (refer to attached locale map). The problems have existed in the area for an extended period of time and may trace back prior to the area being annexed into the City in 1966 and 1967. The City's 1966 Storm Drainage report made recommendations for drainage improvements needed in this area. Residents in the area started contacting the City Engineer's office in late 1995 to complain about the drainage problems. There were, following these complaints, at least two neighborhood public meetings involving the Mayor and/or members of Council. In addition, staff performed investigations to view the various problems and determine the improvements needed to mitigate the flooding problems. Staff's field investigations confirmed the need for major drainage improvements in this area to provide a storm sewer outfall to Spring Creek. This need is the result of no formal storm sewer system having been developed in the area. When individual property owners built on their lots they typically addressed only their immediate drainage needs. In some areas drainage ways were filled in, redirected or constricted with undersized pipes causing the backup of storm water runoff. Another noted problem was that at least one home was built essentially slab on grade in a low area rather than raising the slab elevation to provide some protection from storm water runoff. The roadside ditches in the area forming the basic drainage outfall system were noted to be in generally good condition with some minor exceptions. The minor problems included poorly draining or undersized culverts and ditches that needed to be regraded or enlarged. However, correcting the minor problems would not take care of the major drainage problems in the area.