ML20099H190

Applicant Exhibit A-169,consisting of Forwarding Brochure Entitled, How Water in Philadelphia Treated & Distributed. W/O Encl

ML20099H190
Person / Time
Site:	Limerick
Issue date:	06/19/1984
From:	Aptowicz B PHILADELPHIA, PA
To:	Martin R NRC
References
OL-A-169, NUDOCS 8411280057
Download: ML20099H190 (4)

Text

.

c;c.: Gn rUo' n \!Sb M* i h k@Ef /F CITT OF P H I Ia .A. D 'EI Is P H I .A.

wit.LIAM J. MARRAZZO W ATER DEP ARTMENT CouulSSioNER 1180 MUNICIPAL SERVICE I %ffy-PHILADELPHIA. PA.19 ' . < ,\

!,ft .c}$

c. -

lir. Robert E. Martin $\Sk(O,.Q)?$

l U. S. Nuclear Regulatory Co=cission ' /s _ M o //

Washin6t on, D. C. 20555 HIN W

Dear Mr. Martin:

Enclosed is a copy of the brochure entitled "How Water in Philadelphia is Treated and Distributed". To sucmarice the informatica contained in the brochure, Philadelphia has three water treatment plants - Samuel S. Baxter, Queen Lane and Belcont. The Baxter Plant (Torresdale in the brochure, due to a name change in 1983) takes about one-half the City's requirecent from the Delaware River, and the other plants take the remainder from the Schuylkill River.

( )

V The nor=al average daily production for all three plants combined is appronicately 330 million gallons." Of course, peak days during the su==er due to fire hydrant usage and during the winter due to broken water cains can reach about 470 mgd with instantaneous peaks reaching 700 cgd.

The three plants have a similar treatment schece: natural sedicentation, di infection, chemical treatment, coa 6ulation, settling, filtration, a=moniation, and fluoridation. The fi.Lters are mostly conventional rapid sand filters, however, there are 15 dual media filters at Baxter. As filters need replacement, the core efficient dual media mode is utilised. Powdered activated carbon and chlorine dioxide can be added to the water for the treatment of offensive tastes and odors and algae control.

An aspect of operations not described in the enclosed brochure is sludge generation and disposal.

i The Baxter Plant utilizes a raw water basin in which natural sedicentation settles out heavy particles in the river water. Backwash water from the filters

! is .lso discharged into this basin. In the past, about every six years the basin was dredced and the sludge pumped to a 19 acres sludge lagoon which is on the precises. Cotx:lencing in the summer, a contractor will recove the approricately 25 years of accumulated thickened sludge from the sludge lagoon. When this is

, ID V

8411280057 840619 PDR ADOCK 05000352 PDR G

1 l NUCLEAR RfCULATORY COM?.ilSSION Docket NoNO ~ N3 ial Dh. No. / ---

la the m3ttar of _ YFOO

!d O l

Staff - IDirms itD , _t

' f '

l Applicant V REC?!C3 __ _

Interveror qEj:;itg l _,

} Cont'g O!!'r h

f Contractor __ D AT6 3 Other weness Nort:r D SM W 1

i i

1 1

i l

l

• L

Mr. Robert E. Martin. April 23, 1981+i I completed.(by the Spring of 1985) the raw water basin will be dredged on an

~d . annual basis using a purchased dredge and plant forces. -The sludge will

still be discharged to the renovated sludge lagoon.

The coagulant, ferric chloride, generates a sludge which consists of mostly ferric hydroxide, river silt, and river clay. Most of this sludge is settled in the sedimentation basins and is pumped to the sludge lagoon. The remainder is filtered out and is removed during .the backwash. As previously stated,' this backwash is discharged into the raw water basin.

The Belmont Plant similarly utilized a raw water basin which collects l! heavy particles through natural sedimentation. However, a division wall-(_ pemits half of the raw water basin to be taken out of- service at Belmont.

1 - Each half of the basin is cleaned every three years. The accumulated sediment

'is discharged to a sewer which-transports the material to the City's Southwest

Wastewater Treatment Plant.

t This plant uses alum as a coagulant which genere.tes an aluminum hydroxide sludge. The sludge from the sedimentation basins and the filter baclarash are also discharged to the sewer and are likewise conveyed to the Southwest L Wastewater Treatment Plant.

The Queen Lane Plant also has a raw water basin which collects sediment through natural sedimentation. Every ten years this basin is dredged and the solida deposited in a lagoon which is located on the plant grounds. Ferric chloride and alum are alternated at this plant and the resulting sludge from i the sedimentation basins and the backwash water are discharged to a sewer which is serviced by the City's Southeast Water Pollution Control Plant. In turn, sludge removed at the Southeast Plant is sent through a force main for -

further treatment at the Southwe,st Plant.

i In general, under nomal operations, water from the Baxter Plant services the area of Philadelphia which is east of Broad St. Water from the Queen Lane Plant services the area west of Broad St. to the Schuylkill River. Water from

, the Belmont Plant services the area west of the Schuylkill River.

i However, in an emergency, assuming the Baxter plant is fully on line (no significant equipment out for maintenance), no critical water mains are out of service, and an average daily flow, Baxter can via valve changes in the

Distribution System, supply the City's entire needs with the exception of the

! Belmont Eish Service District. This area borders City Line Ave. and represents

approximately 12 mgd. .

Also, please find a data report of water analyses of the raw and finished water.

1 If you need any additional infomation, or clarification of the enclosed caterial, please do not hesitate to call.

Sincerely 3ours s 5 ERUCE S. APTCWICZ, PJd"22 \

" \

Water Operations * .

BSA:sab , -

Enclosures