2026 05 05 Response Letter rcd 5 6 2026

Mavis Tire Supply, LLC May 5, 2026 Page 9 of 21 21. There is a discrepancy between sheet 7 and the 'Outlet Control Structure #2 Detail' on sheet 15 regarding the invert of the 6" pipe. Revise accordingly. Response: The site plan drawings have been revised to eliminate discrepancy on the 6” pipe invert between plans and the “Outlet Control Structure #2 Detail”. 22. The Drainage & Utility Plan (sheet 7) shows an existing manhole at the southeast corner of the site which could not be opened. The plans must be revised to clarify the purpose of this manhole and to show any associated piping. In their February 19, 2026 letter, Messrs. Ritchie and Freud state that they are working with project surveyor to identify the purpose of this manhole, and this information will be provided as a condition of approval. Response: The project surveyor is scheduled to revisit the site to attempt to open the existing manhole and identify its purpose and any associated piping on May 5, 2026. A report to summarize these findings will be provided as a condition of approval. 23. Sheet 7 shows a proposed storm cleanout within the bioretention basin at elevation 619.39. This will result in the separation between the underdrain and the sand layer being less than the minimum three inches. Revise to ensure the minimum separation is met. Response: The site plan drawings have been revised to ensure a minimum separation of 3 inches is held between the proposed underdrain and sand layer. 24. The 'Doghouse B Inlet Detail' on sheet 14 and 'Type B Inlet' on sheet 15 should be revised to include a N-Eco Curb Piece. Response: Note #4 within the “Type B Inlet Detail” includes the requested information regarding the N-Eco Curb Piece. The site plan drawings have been revised to include a similar note on the “Doghouse B Inlet” Detail. 25. The 'Outlet Control Structure #2 Detail' on sheet 15 must be revised to provide a trash rack on the 0.6' weir. Response: The site plan drawings have been revised to provide a trash rack on the 0.6’ weir in the “Outlet Control Structure #2 Detail”. 26. The 'Outlet Control Structure #2 Detail' on sheet 15 shows a 2.5" PVC pipe in the structure noting "Stopcock gate to be closed for normal operations". The Applicant must clarify the purpose of this pipe. Response: The 2.5” PVC pipe with stopcock gate is proposed at the bottom of the outlet structure and near the basin

closed for normal operations". The Applicant must clarify the purpose of this pipe. Response: The 2.5” PVC pipe with stopcock gate is proposed at the bottom of the outlet structure and near the basin bottom elevation to allow the owner to drain the basin in the event infiltration failure occurs. The valve is to be closed during normal operations to maintain consistency with the design intent.