263-22 Proposal - SCE.pdf

SCE-P13155.011 August 22, 2022 We have assumed the following for this phase of work: = Approximately 255 ouffalls will be mapped and inspected. = Township will provide DPW staff member fo assist in accessing and locating ouffalls. Part B We understand the Township's MS4 permit obligations and how GIS can be used to efficiently collect, manage, analyze, and export data required to comply with the MS4 permit. Our team will supplement the outfall and catch basin data that is collected in Tasks 2 and 3 with the following stormwater system features: MS4 ground water discharge points (tyoe) MS4 interconnections (type into/from, entity) Storm drain inlets (type, catch basin present, label present, retrofitted) MS4 manholes MS4 conveyance (type, direction of flow) MS4 pump stations = Stormwater facilities (type) = Property boundaries of maintenance yard(s) and other ancillary operations (type) The subsurface stormwater conveyance system will be digitized into GIS based on a combination of the Township's existing stormwater as-built drawings and additional mapping, field observations including GNSS data collection of stormwater surface features, and stormwater system knowledge of Township staff. The GIS stormwater system will be digitized following GIS best practices. Point features including catch basins, outfalls, manholes, etc. will be “snapped” to line features such as gravity mains, retention/detention basins, etc. The system will be digitized to incorporate the proper flow direction. The result and final deliverable of this phase of work will include GIS data of the Township's stormwater conveyance system. Preparing the Township's stormwater inventory and mapping in this manner will result in an authoritative GIS dataset that can be used by the Township in the future to analyze the stormwater conveyance system to trace potential illicit connections, perform stormwater modelling, assist with the operations and maintenance of the Township's stormwater system, and more. Quitfall Pipe Stream Scouring Stream scouring is one (1) aspect of the outfall inspections that are proposed to be completed as part of Phase 3 Part A as outlined above. Outfall locations that may be coniributing to localized stream scouring will be identified as part of the “Outfall Inspection Results Summary” letter report that will be provided to the Township. These locations

ations that may be coniributing to localized stream scouring will be identified as part of the “Outfall Inspection Results Summary” letter report that will be provided to the Township. These locations will be mapped and photographed as part of the outfall mapping. An additional “Stream Scouring Investigation Recordkeeping Form" will be prepared for