PSA - Long-Termed Control Plan Stantec Consulting Services

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Stantec Consulting Services Inc. 6 of 16 TO1 – Randolph-Sampson RTB PER If the initial assessment determines that supplemental investigations of resources other than wetlands are required, STANTEC will advise the CITY and prepare a scope and budget for the supplemental investigations. STANTEC will prepare a technical memorandum documenting the environmental and cultural resource investigations performed, the findings from the above investigations, any special permitting requirements likely to be triggered by environmental or cultural conditions within the site. This memo will be included as an attachment to the Preliminary Engineering Report (Task 6). If a USACE 404 permit, IDEM 401, or floodway permit is determined to be necessary for the project, preparation of the permit application will be included in the scope of the preliminary and final design amendment to this agreement. Subtask 2.3- Local Stormwater Drainage Evaluation The proposed site for the Randolph-Sampson RTB appears to be a stormwater detention facility. Considering that significant modifications are anticipated at the site, including potential for an above grade structure containing electrical equipment and chemical storage and feed facilities, it is critical to understand the existing stormwater drainage and flood control conditions upstream, downstream, and at the proposed RTB site. STANTEC will request from the CITY available design or historic performance information for the apparent stormwater detention facility. If an existing surface drainage model is available, STANTEC will review the model and use it to characterize drainage patterns impacting the site for a range of design storms. If there is no surface drainage model, STANTEC will modify the existing PC SWMM model of the CITY’s combined sewer system to for analysis of overland flow patterns for 10-, 25-, 50- and 100-year design storms under existing conditions. This site is located within a FEMA Zone A special flood hazard area. If the conceptual analysis identifies a need for a Letter of Map Amendment (LOMA), budget for preparation of the request for the LOMA will be included in the scope for preliminary and final design to be authorized in an amendment to this agreement. STANTEC will prepare a technical memorandum documenting the local stormwater drainage evaluation of the existing and proposed site conditions. The memorandum will be either incorporated into the PER or included as an attachment to the document. Subtask 2.4- Phase I Environmental Site Assessment A Phase I Environmental Site Assessment (ESA) for the Project site will be conducted in accordance with the All Appropriate Inquiries (AAI) Final Rule 40 CFR Part 312 for protection from environmental cleanup liability under the federal Comprehensive Environmental Response, Compensation and Liability Act (CERCLA), by adhering to guidance detailed in the ASTM International (ASTM) E1527-21 Standard Practice for Phase I Environmental Site Assessments: Phase I Environmental Site Assessment Process. The proposed Environmental Site Assessment (ESA) will be accomplished by, and limited to, the following: • A pre-assessment review (i.e., before the site visit, if practical) of available pertinent documents. This proposal serves as Stantec’s request to client to provide available documents which may