ML19274F938

Forwards Discussion of Floodplain Issues to Be Included in Fes Per Request

ML19274F938
Person / Time
Site:	05000580, 05000581
Issue date:	06/26/1979
From:	Bivins W Office of Nuclear Reactor Regulation
To:	Gilbert R Office of Nuclear Reactor Regulation
References
NUDOCS 7908270181
Download: ML19274F938 (2)

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f Docket Nos.

-580 JUN 2 61973

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MEl'ORANDUM FOR: Rob m Gilbert EPM

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l Environmental Projects Branch No. 2 D88 x

FRO'1:

William S. Bivins, Leader Hydrologic Engineering Section Hydrology-Meteorology Branch, DSE S'JBJECT:

FLOOOPLAIN CONSIDERATIONS

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. PLANT hAME: Erie Nuclear Units 1~and 2 I

Ii LICENSIt'G STAGE:. CP DOCKET NUMBERS: 50-580/581 ~

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RESPONSIBLE GP.ANCH: EPBf2; R.' Gilbert EPM As per your request's enclosed 'is a dise:r.ision of floodplain. issues, in conformance.with Executive. Order 11988, sich should be included in the

. FES. We have. concluded.th'at because.no.aignificant offsite. hydrological' impacts have been identified,. alternatives to.the proposed action, as.

discussed in Executive Order 11988.00 Floodp1Ain Management,need not be considered. If other revirewers, e.g., biological and. sociological, can come to similar conclusions, you may be able to generalize our statement by eliminating the word "hydrologicaT*. This. review was perfom?d by M. Fliegel. _

Ori tnal Signed'by 6

l NML koh3SC4) i Willian S. Bivins, Leader i

Hydrologic Engineering Section I

Hydrology-Meteorology Branch l

Division of Site Safety and Environmental Analysis F

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Enclosure:

DISTRIBUTION:

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As Stated DOCKET FILES (50-508/581)

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,',~ FLOODPLAIN CONSIDERATIONS In conformance with Executthe Order 11988, Floodplain Management, we haYe inhestigatedthefloodplainrelatedaspectsoftheproposedplant,during both construction and operation. We canclude, that because no significant offsitehydrologicalimpactshavebeenidentified,alternatihestothepro-posed action, as discussed in ExecutiYe Order 11988, Floodplain Management, need not be considered. The floodplains relevent to the site are the section of Lake Eric coast near the intake / discharge system and the upper reaches of two tributaries to Cranberry Creek. The intake and discharge structures are both offshore on the lake bottom in oher5metersofwater. BecauseoftheirsmallsizerelatfYetothescaleof the lake and its shoreline, we conclude that they will haYe no measurable effect on shoreline processes; i.e., water lehels or coastal erosion. Section 4.2.2 contains a discussion of the impacts of emplacing these structures and their pipelines. The makeup water pump house will be constructed on a bluff oEer-looking the lake and approximately 10 meters aboYe the lake surfcce. It is well above the floodplain. The headwaters of the east branch and a tributary of the west branch of Cran-berry Creek will be permanently relocated during construction. No plant structures will be built on the floodplains of these relocated streams. Furthermore, no significant change in the capacity of the floodplain to carry large floods, or to speed runoff adversely, are articipated. A discussion of the impacts resulting from the streara alterations is contained in Section 4.3.2.2. _ _ _ _ _ _ _}}