AgdaPkt 2002-03-11 - Laserfiche WebLink

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REPORT To the Honorable Mayor and City Council From the City Manager March 11, 2002 Subject Consultant Agreement for Engineering Services for the Seaport Centre Assessment District- Engineering File No. 803-02 Recommendation Approve and authorize an agreement with Nolte Associates, Inc., of San Jose, California, for providing consultant engineering services for the evaluation of the levee system protecting Seaport Centre, in an amount not to exceed $19,092. Background Portions of the development within the Seaport Assessment District is at an elevation lower than the highest tidal elevation. For this mason, Seaport Centre is protected by a levee system. Associated with this levee is a storm drain pump station, which discharges into the slough and keeps the Development dry. This levee/storm pump station is one mason why the Seaport Centre Assessment District was established. Levees and storm pump stations are not normally associated with private maintenance, and the lack of proper maintenance may result in a flood, which would affect public welfare. Therefore, the City acts on behalf of the District in maintaining these facilities, in accordance with the enabling documents, and levy special assessments to cover the expenses. The enabling document of the Distdct (Resolution No. 9859, 4/22/85) states that the levee system is to be inspected from time to time, in order to determined the need for rehabilitation. Over time, levees, in general, settle and decrease in height relative to the sea water. This is mainly due to the underlying soil, which tends to consolidate under pressure, or the weight of the levee itself, over time. The levee was constructed in the first half of 1980, as part of the original reclamation of the parcels. A similar survey was done in 1989, approximately seven (7) years after the original construction of the levee. At that time, it was found that most of the levee suffered minor settlement. Of the 8,600 feet of levee, several hundred feet of it has settled between 1 to 1.5 feet. It was determined at that time, that the settlement did not warrant a rehabilitation project. Under normal circumstances, the rate of settlement of soil starts out rapidly and slows down quickly. The majority (60-80%) of the settlement can be anticipated during the first few years. Therefore, staff does not anticipate significant changes from the 1989 Study. -1-