55 dBA

60 dBA

65 dBA

70 dBA

75 dBA

80 dBA

85 dBA

90 dBA

95 dBA

100 dBA

OFFICE

WAREHOUSE

MaintenanceOpen Bay Doors

Fan Deck to Coolin

g Tower Line #

4

Elev. approx. 3

6 Ft.

Fan Deck to

Cooling Tower L

ine #3

Elev. approx.

36 Ft.

Fan Deck to

Cooling Tower L

ine #2

Elev. approx. 3

6 Ft.

Fan Deck to Coolin

g Tower Line #1

Elev. a

pprox. 36 Ft.

Laborat

ory

STORM WATER BASIN

STORM WATER BASIN

STORM

WATER

BASIN

UNIT #1 UNIT #2 UNIT #3 UNIT #4

Noise levels measured with Quest Sound Level Meter, Type II, model # 2100, serial # DAE100019.

Noise Levels at Grade LevelCottonwood Energy Electrical Generating Station

Deweyville, TX 77614

Noise measurements made during peak generating capacity:PM hours during firing of duct burners

June 17th, 18th, and 19th, 2009

Decibels on theA-weighted scale (dBA)

Noise levels are plotted at OSHA criteria levelsand at 5 dB exchange intervals.

Noise levels at duct burners 104 to 99 dBA.

Noise levels at steam drum deck @ elev. 87.5 feet:81 to 78 dBA at eastside of deck77 to 75 dBA at westside of deck

T.O.S. EL.(+) 131'-0"

WORKOVER DECK

E 100'-0"Z

EXHAUST STACKHEAT MEDIA HEATER

28 TON CRANEDN

TURBINE EXHAUSTUP

BOOMFLARE

E 163'-0"Z

PREVAILINGWINDS

NORTHGRID

NORTHPLATFORM

150

UP

AC UNITS

80-MAN

AVIATION FUEL

UPUP

18T CRANE

DN

AT EL(+) 113'-8 1/8"BUILDING 2ND FLOORSTAIR ACCESS TO MCC

RESCUE BOAT

GRINDERFOOD

TRASHCOMPACTOR

DRAIN TANKFILTER

FOAM SKID

100 GAL.

BOOSTER GAS

COMPRESSOR SKID

DISPENSER SKID

SURVIVAL CRAFT

70 dBA

75 dBA

80 dBA

85 dBA

90 dBA

95 dBA

100 dBA

Noise Levels at Workover DeckAnadarko Boomvang Platform

Elevation +131' - 0"

Noise measurements made on February 10th, 20101745 to 1900 hr. CST.

Noise levels are plotted at OSHA criteria levelsand at 5 dB exchange intervals.

Decibels on theA-weighted scale (dBA)

TEMPORARY QUARTERS

PERMANENTQUARTERS

TEMPORARY QUARTERS

MEZZA

NIN

E DEC

K B

ELOW

HELID

ECK

W/IN

DO

TTED LIN

ES

WORKOVER DECKLEVEL

WORKOVER DECKLEVELWORKOVER DECK

LEVEL

A

B

3 1 2 4

OFFLINE DURINGNOISE SURVEY

Noise levels measured with Quest Sound Level Meter, Type I, model # 1100, serial # DBH110007.

65 dBA

70 dBA

75 dBA

80 dBA

85 dBA

90 dBA

95 dBA

100 dBA

ENG.

S2

S1

S3

S6

EXIT 8 EXIT 9 EXIT 10 EXIT 11

S4

S7

EXIT 6 EXIT 7

S12

Cell 30

Cell 11

Cell 11/13

Cell 13

Spec. Mach.

Cell 15

Shipping

Cell 14

Cell 25

Cell 25 Cell 10Cell 10

PU4

Cell 27

S8S9

S10S11

EXITS 3, 4 & 5

EXIT 19 EXITS 15, 16 & 17 EXIT 14 EXIT 13

Ambient Plant Noise Levels

Noise measurements:Sept. 8th and Nov. 28th - 29th, 2006

Noise survey notes:

1. Noise measurements are of ambient plant noise levels. Noise measurements are not for impulsive noises due to passing forktrucks, air blow guns, pneumatic impact drivers, plant intercom announcements, etc.

2. During use of air blow gun, noise levels at operator's ear were measuredto be 95 to 101 dBA. Duration is typically a few seconds per event.

3. During noise survey, sealant batching operations were not beingperformed. Therefore, no noise levels are shown in sealant batching room.

4. In shipping at crating wood shop, noise levels in map are not foroperation of radial arm saw or pneumatic nail gun. During operation of radialarm saw, measured noise levels at operator's ear are 97 dBA when running and107 to 109 dBA when cutting. Saw is typically used a few times per shift; eachoperating event is typically 0.5 to 1 minute.

5. In weld shop, noise levels in map are for welding operations performed in threeworkstations. Noise levels are not for abrasive grinding operations.

HEAT TREAT ROOM

BLOWER RM

BLOWERRM

ELECT PANELS&

WATER PUMPS

Noise measurements not takenduring abrasive blasting operations.

Poly Valve InjectionMolding not operating.

Operating two Promillmilling machines.

Machines #2580 &#2545 not operating.

EMPL

OYEE

LUN

CH R

M