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03-13-23-R
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03-13-23-R
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(assumes 12 structures), including rim and invert elevations. Complete <br />storm structure inventories on existing structures identified by city <br />public works staff for replacement (assumes 13 structures), including <br />rim and invert elevations. All other storm structures will not be <br />inventoried. <br />Bolton & Menk will also complete a bathymetric assessment of each of <br />the three identified stormwater pond areas to quantify the sediment to be <br />removed. This process includes an assessment of original as -built and/or <br />design information, verification of normal pool elevations, and quantification <br />of sediment. It is assumed that the bathymetric survey will only require data <br />collection up to and below the water level. If additional data collection from <br />the edge of water to the top of slope is necessary, it can be added to our <br />proposal for an additional cost. The following further describes the scope of <br />work: <br />• Capture Light Detection and Ranging WDAR) surface contours near <br />basins <br />• Using a kayak, we will measure the depth to the top of sediment, then <br />push the blunt -ended grade rod to the hard bottom and measure again. <br />These depths are recorded, along with a GPS waypoint, for digital <br />surface modeling. We will compare the measured hard bottom to the <br />original as -built and/or design information (if available) and present to <br />the city. If these elevations differ significantly, then a verification check <br />may be appropriate. <br />• Our measurement technique also utilizes a depth finder attached to <br />the kayak. Depending on when in the year the bathymetric data is <br />collected, the sonar returns from vegetation can cloud the dataset. <br />Therefore, the sonar data will be collected and further vetted for <br />accuracy as digital surface datasets are compiled. <br />• Using AutoCAD tools, the collected data will be converted and compiled <br />in a digital format. Surface models will be created to simply quantify <br />the total accumulated volume. These models are also provided to <br />the contractor, should they use automated equipment for sediment <br />removal. <br />• For dry, or very shallow (less than 2 feet) ponds, traditional topographic <br />survey methods will be used. <br />• County GIS parcel linework will be used for right-of-way and property <br />lines. <br />Topographic survey and the proposed strom sewer layout for drainage <br />improvements near 4242 Norma Avenue are assumed to be provided by the <br />city. <br />An electronic base map will be created and submitted to the city for review <br />prior to initiating design work based on the field, aerial, and bathymetric <br />surveys. It is assumed that no easement exhibits will be required for the <br />project. <br />Task 4: Geotechnical <br />Evaluation <br />We have partnered with Braun Intertec for geotechnical evaluation services <br />on this project. Braun has extensive experience performing these preliminary <br />materials investigation tasks on other projects. They have worked with the <br />City of Arden Hills on a number of recent projects and are well -versed in the <br />city's expectations. A full scope of services and assumptions from Braun is <br />included at the end of this proposal. The fee for this task includes a 10% <br />overhead cost for Bolton & Menk to coordinate the work. <br />The city utilized Braun to complete the initial Pavement Evaluation Report <br />for the project area. However, since then, the project scope has changed <br />slightly requiring further investigations. Work under this task includes <br />conducting soil borings on the reconstruction area (James Avenue) because <br />only a pavement core was conducted with the initial investigation, providing <br />a pavement section recommendation for the reconstruction area, and <br />conducting pond sediment sampling, testing, and analysis consistent <br />with MPCA standards (Managing Stormwater Sediment Best Management <br />Practice Guidance) at the three identified pond locations to determine the <br />MPCA management level necessary for landfilling of the excavated material <br />generated from dredging the ponds. Braun will then generate an amendment <br />to the initial geotechnical report that will include these additional findings <br />and recommendations for the project scope. <br />Task 5: Public Engagement <br />Effective, consistent public engagement is a key component to the <br />overall success of any project. Bolton & Menk's extensive communications <br />capabilities allow us to provide you with a tailored approach to engagement <br />that is organized, efficient, and proactive. Bolton & Menk will engage the <br />public and provide a forum for valuable project discussion. We will work <br />with city staff to develop a survey or questionnaire that city staff will mail to <br />impacted property owners during the feasibility study process to identify key <br />project issues and concerns from residents and businesses. This information <br />will be summarized and incorporated in the feasibility report. <br />We will conduct an open house style public informational meeting during <br />the design of construction plans to inform residents of the proposed <br />improvements. We will solicit comments and inputs from residents. These <br />comments will be discussed with city staff and incorporated into the project <br />design, as directed. <br />Bolton & Menk will conduct a second public informational meeting prior to <br />the start of construction. This meeting will focus on what to expect during <br />the construction process, schedule, access, and impacts. Of particular note, <br />the open house will discuss the construction staging plan and estimated <br />duration, access considerations during the utility construction, and what <br />residents may see during construction to plant the seeds of what they can <br />anticipate in advance. <br />
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