263-22 Proposal - Mott MacDonald.pdf

September 9, 2022 | Page 2 of 3 Phase 1 – MS4 Geodatabase Development From Historic Mapping (~60-75% of the MS4 Captured) Under this task Mott MacDonald will develop the base MS4 database using the following workflow: 1. The forty-two (42) historic maps will be georeferenced to the most current orthophotography/landbase using common features shown between the two sources. A minimum of 4 registration points will be used to spread any residual error across the entire image. 2. Working within a standardized MS4 data model, asset locations (inlets, manholes, storm main, etc) will be captured as depicted on the georeferenced plan sheets and connected to the GPS located outfalls. Asset information shown on the maps will be captured into the appropriate GIS attribute field. Based upon a review of the provided plans the following information (diameter, material, flow direction, etc) will be captured. a. A hyperlink will be established between each feature and the corresponding plan image. This will allow for the on-screen retrieval of the source map from directly within the GIS environment. 3. Capture the extents and locations of gaps in the MS4 network. Areas will be identified using common sense logic and engineering principles (ex. All inlets need to terminate at an outfall or detention basin). As discussed previously there are outfalls found in the field for which there is not MS4 infrastructure depicted on the historic mapping. a. The data gaps identified will require additional mapping provided by the Township or County and/or field investigation. The data gaps will aid in the development of the Phase II proposal to complete the mapping of the Township’s MS4 network see below. 4. Apply Mott MacDonald’s standardized QA/QC procedures to ensure features are valid, domain attributes are followed, and feature connectivity has been maintained. Phase 2 – MS4 Geodatabase Refinement from Data Gaps (100% of the MS4 Captured) We believe that at the completion of Phase I Items 1-4, approximately 60-75% of the Township MS4 system will be mapped. After the initial deliverable is presented to West Orange, we will be able to present a second proposal to the Township to complete the mapping for Phase 2. We also believe that the most cost -effective way to complete the mapping is to conduct the required field investigations at the same time the new permit requirements are in

e the mapping for Phase 2. We also believe that the most cost -effective way to complete the mapping is to conduct the required field investigations at the same time the new permit requirements are in effect whereupon the facilities are to be inspected. Missing facilities and data can be captured with one field effort as inspections are made according to the schedule of the permit cycle. Hence, we would defer proposing on Phase 2 of the mapping effort and the future permit inspection items until this initial mapping effort is completed. Putting forth a proposal fee for the Phase 2 effort would truly only be guess, likely based upon the miles of roads in the Township which we do not want to irresponsibly offer without having a sounder understanding of the extent of missing data. Project Deliverables • MS4 GIS Database • MS4 Data Gaps GIS Database