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CC_Minutes_2010_0426
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Roseville City Council
Document Type
Council Minutes
Meeting Date
4/26/2010
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1 infrastructure improvements. WSB handled the bidding process, including questions from <br />2 bidders and issuing of addenda. The inclusion of the storm water reuse system and associated <br />3 filtration beds made this more time consuming than a typical level of effort for both <br />4 answering questions and issuing addenda. <br />5 1.5 Federal Funding- <br />6 $1.6 million dollars of Federal UPA funding was provided by Metro Transit to construct <br />7 Phase 1 of this project. Due to the use of UPA money, the specifications had to include <br />8 several additional requirements, mostly for DBE requirements. WSB needed to coordinate <br />9 with Metro Transit personnel, obtained electronic copies of their forms, and reviewed and <br />10 redlined them for inclusion into the project manual. <br />11 2. Comprehensive Storm Water Plan <br />12 The original scope assumed that much of the water treatment for these public <br />13 improvements would be accomplished in concert with redevelopment. WSB was <br />14 responsible for After submittal of 60 percent plans with drainage treatment ponds shown <br />15 on redevelopment parcels, it was determined that the effort to coordinate a master <br />16 drainage plan with the use of ponds (and obtaining the additional right of way) would <br />17 increase the right of way acquisition cost, as well as create potential future obstacles for <br />18 the property owners to redevelop their sites in accordance with the Twin Lakes design <br />19 principles. At that time, the City directed WSB to design a storm treatment system that <br />20 would be located entirely within the boundaries of the right of way that was being <br />21 acquired for the project. This included a storm water reuse system, complete with <br />22 underground retention and storage, as well as a force main for conveyance of the storm <br />23 water to the irrigation system. These items increased the overall cost to provide these <br />24 services by $81,733. The following tasks were required to complete the final design of <br />25 the system. Many of these tasks were not contemplated as part of the original proposal, <br />26 and required the redesign of the storm sewer conveyance system. <br />27 2.1 Changes in the Storm Water Conveyance System- <br />28 The original conveyance system directed storm water to a series of ponds throughout the <br />29 project. Per the City's direction, all the storm water was now to be directed to a central <br />30 location for storage. WSB reworked the conveyance system to direct water to the future <br />31 remnant parcel at the northeast corner of the roundabout. However, through development of <br />32 the MPCA Response Action Plan, it was determined that this location would not be feasible <br />33 due to high potential for contaminated soils. Thus, WSB had to design the conveyance <br />34 system a third time, resulting in two systems -one that drained as much as possible to the <br />35 new storage location at the north end, and the rest toward Cleveland Avenue. This meant <br />36 redoing spread-runby calculations, modifying catch basin layouts, realigning pipes, adjusting <br />37 pipe grades, and deleting/adding pipe profiles to the plans. <br />38 2.2 Storm Water Storage, Reuse, and Infiltration System - <br />39 Custom design of the storage, reuse, and infiltration system was required. Activities included <br />40 research of available systems and materials; coordination with potential suppliers to provide <br />41 a wide variety of alternatives for consideration; schematic design of the system to meet <br />42 requirements for seasonal considerations, infiltration rates and volumes, storage versus reuse <br />43 rates, and maintenance access; introduction of lift station and well system design expertise <br />3 <br />
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