Stormwater, Floodplain and Drainage Memo - Tamsin Ridge Solar and Storage Project

C-ebc49abde3 · Page 1 of 3 · DR-0019 · 2023-06-05

The claim, in the assessor's words

Basins have embankments no higher than 6 feet and about 9 acre-feet each, below the size requiring an ODNR dam construction permit.

Quoted from page 1

The basins have embankments no higher than 6 feet and hold about 9 acre-feet each, below the size at which

Source consultant_memo · Claim type absence · Polarity absence · Confidence high · Quote check exact, 100 of 100

Cited by EN-08 Natural Hazards and Climate Exposure, EG-02 Stormwater, PE-02 State Jurisdiction · Filed under EG-02, PE-02

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Tessmer Coyle Engineering, Inc. Civil engineering, stormwater and transportation | New Philadelphia, Ohio Stormwater, Floodplain and Drainage Memo To: Northfold Energy Partners, LLC. From: Tessmer Coyle Engineering. June 5, 2023. Re: Tamsin Ridge Solar and Storage Project, Harrison Township, Carroll County, Ohio. 1. Construction stormwater Construction will disturb more than one acre, so the Project needs coverage under Ohio EPA's construction stormwater general permit OHC000006 (effective April 23, 2023). Coverage requires a Stormwater Pollution Prevention Plan (SWP3) and a Notice of Intent with the fee, and is not effective until Ohio EPA's approval letter is received. The SWP3 will cover the fenced area of about 780 acres, of which about 96 acres will be graded; the rest of the array area is driven piles with the existing ground cover kept or reseeded. Erosion and sediment controls: silt fence and compost filter sock along slopes and streams, sediment basins for graded areas over 10 acres, construction entrances, stabilization within 14 days of final grade, and inspection after every rain of half an inch or more. 2. Post-construction stormwater Because more than two acres will be disturbed, post-construction practices must treat the water quality volume, the runoff from a 0.90-inch rainfall. Ohio EPA's 2022 solar guidance treats panels over a well-vegetated pervious surface as disconnected impervious area. That applies to the arrays, provided the ground under them is kept in dense vegetation and runoff is not collected in swales. It does not apply to the gravel access roads, the substation, the BESS yard and the operations building, about 14 acres of impervious and gravel surface. These drain to two extended detention basins, one in each block, sized for the water quality volume and to hold peak runoff from the 2-year to the 100-year storm at existing rates. The basins have embankments no higher than 6 feet and hold about 9 acre-feet each, below the size at which an ODNR dam construction permit is needed. Soils are mostly hydrologic soil groups C and D (slow infiltration), so runoff potential is moderate to high. Sallow Creek is not on Ohio EPA's list of impaired waters and no TMDL applies to it. Tessmer Coyle Engineering, Inc. - Job 2317 Page 1 of 3

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Page 1 of Stormwater, Floodplain and Drainage Memo - Tamsin Ridge Solar and Storage Project

Other claims quoted on this page

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Disturbance over one acre requires Ohio EPA construction stormwater general permit OHC000006 coverage, including an SWP3 and Notice of Intent.
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SWP3 covers a fenced area of about 780 acres, of which about 96 acres will be graded.
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Post-construction practices must treat the water quality volume (0.90-inch rainfall runoff) because more than two acres will be disturbed.
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Ohio EPA's 2022 solar guidance treats panels over well-vegetated pervious surface as disconnected impervious area, provided dense vegetation is kept and runoff is not collected in swales.
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Soils are mostly hydrologic soil groups C and D, with moderate to high runoff potential.
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Sallow Creek is not on Ohio EPA's impaired waters list and no TMDL applies.