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

C-9f6b8123d8 · Page 2 of 3 · DR-0019 · 2023-06-05

The claim, in the assessor's words

Landowners report floodplain fields flood for a day or two most springs.

Quoted from page 2

the floodplain fields flood for a day or two most springs.

Source consultant_memo · Claim type presence · Polarity presence · Confidence medium · Quote check exact, 100 of 100

Cited by AQ-02 Floodplains, EN-08 Natural Hazards and Climate Exposure · Filed under AQ-02, EN-08

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Stormwater, Floodplain and Drainage Memo - Tamsin Ridge 3. Floodplain FEMA's effective Flood Insurance Rate Map (panel 39019C0135D, effective September 14, 2018) maps Zone AE, with a regulatory floodway, along Sallow Creek through the middle of the site. About 62 acres of the parcels are in Zone AE, of which about 21 acres are floodway. Base flood elevations are 1,012 to 1,019 feet (NAVD 88). Layout. No arrays, inverters, the substation, the BESS yard or fill are placed in the floodway. About 14 acres of array rows are in the flood fringe (Zone AE outside the floodway) on Parcels 9 and 10, set so that the lowest module edge at full tilt is at least 2 feet above the base flood elevation; inverters and electrical equipment are at least 2 feet above it and outside Zone AE. The two collection line crossings of Sallow Creek are directional bores. Piles in the flood fringe displace a negligible volume. Permits. Carroll County's floodplain regulations exempt major utility facilities permitted by the OPSB, but OPSB staff expect the application to show compliance with them. A no-rise certification would be needed for any work in the floodway; none is planned. Flooding history. Landowners report that Sallow Creek overtopped Linnet Road at the county bridge during the flash flood of June 2019 and that the floodplain fields flood for a day or two most springs. The flood fringe array rows on Parcels 9 and 10 should be checked against a local hydraulic model before final design; if flood levels prove higher than mapped, those 14 acres may need to be dropped. 4. SPCC The main power transformer holds about 14,000 gallons of mineral oil, so the substation needs a Spill Prevention, Control and Countermeasure (SPCC) plan under 40 CFR Part 112, with secondary containment around the transformer. 5. Water supply and private wells Construction water, about 4 million gallons for compaction and soil conditioning, will be bought from the Village of Carrollton public water system and trucked in; no water well will be drilled. The operating facility needs no process water, and any panel washing would use trucked water. The nearby residences and farmsteads rely on private water wells in the shale and sandstone aquifer. Ohio EPA source water protection mapping shows no drinking water source protection area within the parcels. Northfold should offer pre-construction testing of private wells within 1,000 feet of pile driving. Tessmer Coyle Engineering, Inc. - Job 2317 Page 2 of 3

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Page 2 of Stormwater, Floodplain and Drainage Memo - Tamsin Ridge Solar and Storage Project

Other claims quoted on this page

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FEMA maps Zone AE with a regulatory floodway along Sallow Creek through the middle of the site.
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No arrays, inverters, substation, BESS yard or fill are placed in the floodway.
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About 14 acres of array rows are in the flood fringe on Parcels 9 and 10.
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Carroll County floodplain regulations exempt major utility facilities permitted by OPSB, but OPSB staff expect the application to show compliance.
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Landowners report Sallow Creek overtopped Linnet Road at the county bridge in the June 2019 flash flood.
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Flood fringe array rows should be checked against a local hydraulic model; if flood levels are higher than mapped, those 14 acres may need to be dropped.
C-e571f3a9eb
Main power transformer holds about 14,000 gallons of mineral oil, so the substation needs an SPCC plan under 40 CFR Part 112.
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Nearby residences and farmsteads rely on private water wells in the shale and sandstone aquifer.
C-afa9ffa993
Ohio EPA source water protection mapping shows no drinking water source protection area within the parcels.
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Northfold should offer pre-construction testing of private wells within 1,000 feet of pile driving.