ML20236U261

Requests Temporary Approval to Discharge Effluent from Dewatering of Dredge Matl to Stormwater Outfall 012 at Limerick Generating Station

ML20236U261
Person / Time
Site:	Limerick
Issue date:	07/23/1998
From:	Matty R PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Newbold J PENNSYLVANIA, COMMONWEALTH OF
References
NUDOCS 9807290414
Download: ML20236U261 (7)

Text

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Environmental Aff:ir3 Divi:lon

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.PECO ENERGY nceg=j=3,.2 PO Box 8699 Philadelphia, PA 191018699 215 841 5030 July 23,1998 Mr. James Newbold Chief, Permits Section Department of Environmental Protection Water Management Program Lee Park, Suite 6010 555 North Lane Conshohocken, PA 19428

Subject:

Limerick Generating Station NPDES Permit No. PA0051926 This letter is being sent to request a temporary approval to discharge effluent from the dewatering of dredge material to stormwater outfall 012 at Limerick Generating Station. Maintenance dredging will be performed in the Schuylkill River intake Structure Wet Wells.

The sediments will be removed and placed in a low lying area adjacent to the pump house (see attached site map). Water from the dredge material will be discharged through a standpipe to outfail 012 at a discharge rate of approximately 200 gpm. To control the discharge of solids to the river, the standpipe will be covered with a 200 micron mesh canvas material. The estimated discharge volume over the length of the project is 0.5 million gallons.

Approximately 60 cubic yards of dredge material is expected to be removed from the wet wells. Once dewatered, the sediments will be disposed at a permitted waste management facility. The project is scheduled to begin August 3,1998, y

and will operate for approximately five days over a two week period. Therefore, your prompt attention to our request would be appreciated.

Please note approval of this temporary discharge was previously granted by PaDEP in July 1993, August 1996 and most recently in August 1997. Enclosed for your information is a copy of the 1997 approval as well as sampling data obtained during the 1997 dredge dewatering operations.

118147 9907290414 990723 PDR ADOCK 05000352 P

PDR g

A copy of this letter (including any attachments or enclosures) is being sent to r

, the U.S. Nuclear Regulatory Commission (USNRC), in accordance with the Limerick Generating Station, Units 1 and 2, Environmental Protection Plan, j

Section 3.2, which stipulates that the USNRC shall receive a copy of any proposed changes to the NPDES permit at the same time that the permitting agency is notified.

If you have any questions or require additional information, please contact me at (215) 841-5177.

j Sincerely, 5

l.

Robert M. Matty, Jr.

Engineer 4

Environmental Affairs

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Attachment

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cc:

U.S. Nuclear Reguatory Commission, Document Control Desk (Docket Nos. 50-352 and 50-353 & License Nos. NPF-39 and NPF-85)

)

H. J. Miller, Administrator, USNRC, Region 1 J

USNRC Senior Resident inspector, LGS 1

1 r

, :3 Pennsylvania Department of Environmental Protection Lee Park, Suite 6010 555 North Lane Conshohocken, PA 19428 Southeast Regional Office buti.21 N 610 832-6130 Fax 610 832 6133 Mr. Robert M. Matty, Jr.-

Engineer, Environmental Affairs PECO Energy Company 2301 Market Street P.O. Box 8699 Philadelphia, PA 19101-8699 Re:

Limerick Generating Station WQ/GeneralIW Correspondence Limerick Township Montgomery County

Dear Mr. Matty:

This is in response to your July 30,1997 letter requesting approval to discharge wastewater generated from the dredging operation of the Schuylkill River Intake Structure Wet Wells at the Limerick Generating Station. The discharge is eqected to occur for five days over a four week period.

The wastewater will discharge to the Schuylkill Rive through a standpipe to stormwater Outfall 012 at a maximum flow rate of 200 gpm. The stand pipe will be covered with a 200 micron mesh canvas material to control the discharge of solids to the river. We hereby approve your request to discharge subject to the following conditions:

1.

The following discharge requirements shall be met.

I A.

The discharge shall not contain any substances in concentration or i

amounts sufficient to be inimical or harmful to the water uses to be protected or to human, animal, plant, or aquatic life.

B.

pH: 6.0 to 9.0 Standard Units C.

Iron: as total iron and as dissolmd iron shall be monitored daily.

D.

Oil and Grease: shall be mu 'itored daily.

E.

Total Suspended Solids: shall be monitored daily.

I 1

An [qud Opportunity / Affirmative Action Employer http://www dep. state pa.us Printed on Recycled Paper l

l l:

Mr. Robert M. Matty, Jr.,

i l

2.

The wastewater discharge to the stormwater Outfall 012 shall be monitored daily for the above pollutants until the discharge ceases. A composite sample must be l

collected for iron and total suspended solids and a grab sample for pH and oil and grease.

l 3.

Collected screenings, slurries, sludges, and other solids shall be handled and disposed of in compliance with 25 Pa. Code, Chapters 271,273,275, 283, and l

285 (relating to permits and requirements for landfilling, land application, incineration, and storage of sewage sludge), Chapters 262,263 and 264 (related to permits and requirements for landfilling and storage of hazardous sludge) and applicable Federal Regulations, the Federal Clean Water Act, RCRA and their i

amendments.

l I

l 4.

The monitoring reports shall be submitted to:

Pennsylvania Department of Environmental Protection Fields Operations - Water Management Lee Park, Suite 6010 555 North Lane Conshohocken,PA 19428 l

5.

This approval shall expire upon completion of the above dredging operation.

If you have any questions, please contact Jim Roth of our staff.

Sincerely, lI pwt '

,e V[ Acting Regional Manager ames New' bold, P.E.

l Water Management cc:

Montgomery County Health Department Delaware River Basin Commission Limerick Township Mr. O'Neil Mr. Newbold Mr. Ryan

- Re 30 (SMC)224

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l PECO ENERGY

gg;;g;,n l-Po Box 8699 Philadelphia PA 19101-8699 215 841 4000 October 15,1997 l

PA Department of Environmental Protection 1

Field. Operations - Water Management '

Lee Park, Suite 6010 555 North Lane Conshohocken, PA 19428 Gentlemen:

I

Subject:

Limerick Generating Station NPDES Permit No. PA0051926 Enclosed are sampling results from effluent discharged to the Schuylkill River as part of a dredge dewatering operation at Limerick Generating Station. The material was removed from the Schuylkill River intake Structure wet wells and placed in a low lying area adjacent to the intake structure. Water from the dredge material was discharged through a standpipe to outfall 012. All sampling and analyses were performed as required by the August 21,1997, approval letter from Mr. James Newbold (attached).

g If you have any questions or require additional information concerning the sampling results, please contact me at (215) 841-5177.

Sincerely, Robert M. Matty, Jr.

Engineer Environmental Affairs Attachment i.

94255 L __ - _ -

l I

l-The following results are from samples collect and analysis during dredging of the Schuylkill River i

purpp house from August 19,1997 until September 4,1997. The sampling and analysis was l-performed according to the previsions stated in DEP letter from James Newbold to Robert Matty.

l l

Date@ Time pH / Temp 'C TSS Oil & Grease Iron (total) fron(dissolved)

I pH ppm ppm ppm l

8/19/97 @ 1555 7.51/26.1 13.3 2.3 0.6532

.028 8/20/97 @ 1500 7.47/20.0 95.2 1.9 3.147

.025 8/21/97 @ 1510 7.55/21.0 175.5

<0. 8 5.335 0.118 8/22/97 @ 1505 7.61/21.0 19.4 1.0 0.676 0.029 l-

- 8/25/97 @ 1505 7.68/22.5 157.9 1.0 4.84 0.046 l

8/26/97 @ 1507 7.69/22.0 26.2

< 0. 8 0.776 0.033 8/27/97 @ 1504 7.70/23.0 10.2 1.8 0.26 0.025 l

8/28/97 @ 1502 7.68/22.5 20.2

< 0. 8 0.278 0.019 8/29/97 @ 1345 7.71/22.0 2.3

<0.8 0.125 0.187 9/3/97 @ 1515 7.70/21.0 115.5 3.3 3.1759 0.044 9/4/97 @ 1505 -

7.72/20.0 11.2

<0.8

.2395 0.022 i

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