Comprehensive Stormwater System Survey and Assessment Services

The Vendor is required to provide to conduct a comprehensive stormwater system survey and condition assessment that will allow the city the ability to evaluate the system’s performance and capacity and develop long range improvement projects.
- The objectives of this survey and assessment include:
• Update and amend the City’s stormwater infrastructure database, including assets within the right-of-way and assets upstream and downstream on public or private property.
• Evaluate the structural and operational condition of the surveyed assets.
• Develop prioritized recommendations for maintenance, rehabilitation, and repair.
• Provide an updated, comprehensive geospatial database of stormwater assets.
- Provide a more comprehensive picture of the stormwater system.
- The previous inventory provided a baseline, the next effort will serve to build upon that base and fill in the data gaps.
- The city is interested in completing the assessment as quickly as possible while ensuring the data captured is of sufficient quality that long-term decisions related to operations, maintenance, and the appropriate extent of service can be made.
- Data review and preparation
• Gather and become familiar with existing stormwater system GIS data and maps, as-built drawings, and associated data.
• Review prior assessments, historical maintenance records, and inspection reports.
• Review the city’s extent of service and level of service policy.
• Working with city staff, review and refine the details of the GIS data collection methodology and condition assessment scoring. 
• The survey will be conducted using a replicated version of the city’s ArcGIS geodatabase.
• Working with city staff, prepare a phased strategy and timeline for data collection. 
• Survey phasing will be based on sewer zones.
• Note that the city will provide all existing databases, maps, records, and other available information and resources requested by the contractor to utilize in updating the inventory.
- Mapping and inventory
• Conduct a GPS-based field survey to locate all stormwater structures (e.g., inlets, headwalls) and conveyances (e.g., pipes, streams) in the city. 
• Capture all assets from centerline to outfall, with xyz coordinates to sub-0.1-foot accuracy, and collect structural attribute data, e.g., structure type, size, dimensions, material. 
• Most assets will only require location verification and updated attributes.
• Update GIS data with field-verified locations and attributes. 
• A GIS feature service developed by the city will be provided to use in the collection and storage of each feature. 
• The city’s grid-based naming conventions shall be employed for all newly identified assets.
• Elevation data will be recorded at the top of each structure. 
• Dropdown depths for each conveyance will be recorded from the top of each structure. 
• The corrected elevation must be provided for the invert at the upstream and downstream of each conveyance.
• The extent of structures and conveyances to locate in the inventory is all structures, both public and private, including ditches and streams. 
• The intent is to have a totally connected system. 
• The contractor shall verify ownership of all structures and conveyances by utilizing the existing database, right-of way boundaries, recorded plats, and record drawings where available.
• The contractor shall determine, when available, the date of installation/construction for manmade structures and conveyances.
• Safety is important to the city for all contractor personnel that will be in the field. 
• Provide traffic control, as needed, to complete any inspections in the right-of-way.  
• Perform visual inspections of structures and conduits for blockages, cracks, corrosion, sediment buildup, and structural failures, with photographic documentation.
• Images of structures will be taken of both the inside and the outside of the infrastructure. 
• Flash photography should be used to record images of the inside of the structures. 
• The make and model of the proposed camera must be included in the contractor’s response. 
• All images will be provided in jpeg format. 
• Two images per asset will be saved as attachments to the feature service.
• Photos and videos with an HD pole camera or similar are required to assess internal conditions of all underground conveyances.
• City staff can assist where CCTV is needed. 
• These images will be recorded from a stationary position within the adjoining stormwater structure. 
• When access is not limited, images must be obtained from both the upstream and downstream adjoining structure. 
• The videos should be approximately 10 to 20 seconds of stabilized video that show the conveyance at multiple zooms. 
• The camera must be equipped with lighting that will sufficiently illuminate culverts for a minimum of 200 feet.
- Contract Period/Term: 1 year
- Pre-Proposal Meeting Date: July 09, 2025
- Questions/Inquires Deadline: July 11, 2025