ML20028D907

Rept on Ambient Noise Survey

ML20028D907
Person / Time
Site:	Limerick
Issue date:	09/24/1973
From:	Lou S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20028D904	List: ML20028D903 ML20028D907
References
NUDOCS 8301200075
Download: ML20028D907 (16)

Text

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-a JOB NO. 8031 PHILADELPHIA ELECTR f C COMPANY LlHERICK GEfIERATING STATION REPORT ON AMBIENT NOISE SURVEY By S. C. Lou September 24, 1973 INTRODUCTION As part of the environmental consideration for the design and construction of the Limerick Generating Station, a sound survey of the area surrounding the plant site was conducted by F. H. Brittain and 5. C. Lou, both noise specialists of Bechtel.

In order to obtain a variety of ambient conditions with minimum interference from construction, the measurements were made on Tuesday, June 12, 1973, when schools in the area were still in session; in the early morning of Wednesday, June 13, between the hours of 2 and 4 a.m.; on Wednesday, June 13, the first day the schools were out; and on Saturday morning, June 16, repre-senting a weekend, when all construct *on at the plant ceased.

During the week days, construction was limited to some earth moving equipment working at a slack pace.

S ITE DESCR IPTION The site of the generating plant is located about 2 miles southeast of Pottstown, Penn., on the east bank of Schuylkill River as it flows towafd Norristown and Philadelphia into the Delaware River.

To the north is the town of Sanatoga and to the south are Linfield and Parker Ford, all within 1 to 2 miles.

U.S. Highway

42. runs east-west about I mile north of the site, and at about the same distance to the southwest is State Highway 724.

Concentrated residences are located in Pottstown and Linfield, each about 2 miles from the plant.

More scattered residences are found along Ridge Pike, which extends east from Pottstown's main business street, High Street; along Schuylkill Road, a main road parallel to Highway 724 on the west side of Schuylkill River, and along some smaller roads around the plant site.

General terrain of the area consists of rolling hills with open fields inter-spersed with densely wooded sections.

The immediate vicinity of the LGS site is especially largely forested.

Besides the many industrial and commercial operat[ons in Pottstown, there is a big Continental Distillery to the south of LGS, a large Firestone Plant to the northwest, and some light industrial operations on the west bank of the river.

Read!ng Railroad tracks run on the east bank and alongside the west fenceline of the plant, while Penn Central tracks run on the opposite bank.

A topographical map, Drawing No. LGS-101, shows the general features of the area and the relative locations of the different parts described.

On this map are also shown the numbered points where noise measurements were made.

These points were chosen to give a reasonable spread of measuring locations.

They also

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The site of the Limerick Generating Station is shown by the edge-hatched area in the center.

Description of the measuring points is shown on Sheet No. LGS-102 SURVEY PROCEDURE A quick traverse of the area surrounding the plant site was made on the morning of June 12. during which the surveyors f amiliarized themselves with the location and selectcd the points of measurement.

The first round of noise level read-Ings were taken in the afternoon of June 12, but the midnight survey was delayed 2 or 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> by a heavy thunder storm.

Daytime readings were again taken on Wednesday, June 13, to note any difference due to schcois being in or out of session. Finally, the same survey was repeated on Saturday, June 16, to include a weekend noise condition.

Description of the days of measurement is shown on Sheet No. LGS-103.

Measuring instruments used were: B&K Type 2209 Impulse Precision Sound Level Meter with 1" microphone, B&K Type 1613 Filter Set, and B&K Type 4220 Piston-phone for calibration. A tripod and a windscreen were used with the meter throughout the measurements.

The sound level meter was calibrated with the pistonphone before and af ter each complete survey, and it was checked for battery and internal calibration before and after measurement at each point.

The instrument was found to be in calibration at all times, and no adjustment was necessary to any of the readings taken.

NOISE SOURCES Except where specifically noted, only the level of the general noise prevailing at each location was measured.

Bursts' of noise due to automobiles driving by, jet planes flying over, or dogs barking in the neighborhood were not considered as prevailing ambient noise and wc.

not recorded.

Sources constituting the ambient or background noise included wind, rustling leaves, birds, insects, traffic, distant industrial plants, and dripping and flowing water, especially after the Tuesday night thunder strom.

These sources were listed, where relevant, on the data sheets for the different measuring points.

RESULTS The measured noise levels are tabulated on data sh which show measuring points and day of survey, as~ pets LGS-104 through LGS-Il2, described in LGS-102 and 103, the time the measurements were made, and both the A-weighted and the octave band sound levels. Other pertinent information is shown at the top of the data sheets.

The dBA levels at different locations and different times are summarized in the table on Sheet LGS-Il3.

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d SOME OBSERVATIONS Except on three occasions, the ambient noise level at all locations around the Limerick Generating Station was between 39 and 50 dBA.

The three exceptions were:

Point 3 outside the subcontractor gate where the-operation of some earth moving tractors raised the ambient noise level to 60 dBA; Point 2 on the east end of a trussed bridge on Schuylkill River, where a passing train pro-duced a noise level of 67 dBA - after the train passed, the level dropped to 50 dBA - and Point 11 at the Firestone Plant where the noise from the plant measured 54 dBA.

From LGS-ll3, it is seen that at points 1, 3 and 5 the noise level dropped appreciably between Tuesday af ternoon and predawn Wednesday or Saturday morning.

If the noise at these points was attributable to the Firestone Plant, the con-struction inside the LGS site, and Continental Distillery respectively, then the drop might be due to reduced activity at night and on weekends.

Point 2, which was located between LGS and the Firestone Plant, would have shown the same pattern except for the predawn noise level which, Instead of going down, actually increased.

This was believed to be due to increased water flow in the adj acent river after the heavy rain fall, if' variations of I or 2 dB are to be considered insignificant, then the only other observation f rom the summary table on LGS-ll3 is that the daytime level was higher on Wednesday than on Tuesday (Points 7, 8 and 9).

School being out could be one of the reasons for this phenomenon.

However, the readings on Saturday morning at these points seemed to contradict this explanation.

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t LGS-102 Description of Measuring Points.

See Area Map Point I in front of 1435-1443 Sunset Drive.

Quiet residential area.

Point 2 East of trussed bridge on Schuylkill River.

Both bridge and road blocked on days of survey.

Railroad tracks next to the road and quarry about 1000 ft. to the east.

Point 3 On Possum Hollow Road outside of Subcontractor gate.

One residence next to fence owned by P.E.

Ariother residence about 250 ft. further away.

d Light construction going on (Bulldozer moving earth).

Point 4 Corner of Sanatoga and Limerick Center Roads.

Relatively busy intersection.

Open fields with only a few houses in the immediate vicinity.

Point 5 Church and Reformed Roads in Linfield.

Parking lot at back of a church.

Commerical area.

Point 6 On 5 ft. embankment on Long View Road close to railroad tracks.

Paved road ending about 100 ft, to the north.

Open fields around.

Point 7 in Oak Grove Cemetary on Old Schuylkill Road near Saylors Mill Road.

Schuylkill Road is a main thoroughfare and highway 724 is less than 1000 ft. away.

Point 8 in another cemetary on Old Schuylkill Road near Ellis Woods Road.

Highway 724 is less than 1000 ft, to the northeast and U.S. 422 traverses about 3000 ft.

t to the north.

Point 9 in a tall grass field off Fricks Lock. Road.

Residences across and l

up and down the road.

Big Eastern Warehouse about 200 ft. away.

l Point 10 Backyard of P.E. owned residence at northeast corner of Limerick Station Just outside the property fence.

During construction, a batching plant and various tankage fabricating operations will be located in the area inside the fence.

Point 11 in the parking lot of Firestone Plant. *'

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h LGS-103 Description of Days of Measurement.

A Tuesday, June 12, 1973.

Fair and hot with temperature in the 90's, slight breeze and high humidity.

Heavy thunderstorm from 9 p.m. to 1:30 a.n. Wednesday.

B Wednesday, June 13, 1973.

Before dawn, cool after the rain, around 60 F.

Fair and warm during the day with occasional showers, 70,No wigd.

- 80 F temperature with littic wind.

C Saturday, June 16, 1973, morning.

Overcast and cool, 60 70 F, with Ilttle wind.

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Point of Tuesday

' Wednesday Change in. Wednesday Change in Saturday h Change in

~G teasuremen t Afternoon Predawn Noise Level Midday Noise level Morning Noise Level 51 6/12/73 6/13/73

,from Col. A 6/13/73 from Col. A 6/16/73. f rom Col. A

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ES

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49 39

(-10) 43

(-6) tj a;

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(-16) 44

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(-1) c

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(-7) 40

(-6) n

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6 41 43

(+2) 42

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7 44 48

(+4) 43

(-l) 2 igi 8

46 49

(+3) 44

(-2) i j'_]

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