NC0081957_Permit (Modification)_20030514

NPDES DOCIMENT SCANNINO COVER !SHEET
NPDES Permit:
NC0081957
Narrows Powerhouse
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
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,,
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Inspection
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
May 14, 2003
This document is printed on reuse paper. - ignore any
content on the re-iirerse side

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, PE, Director
Mr. Mark J. Gross
Alcoa Power Generating, Inc.
P.O. Box 576
Badin, North Carolina 28009-0576
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
May 14, 2003
Subject: NPDES Permit Modification
Permit NC0081957
Narrows Powerhouse
Stanly County
Dear Mr. Gross:
Upon receipt of your February 26, 2003 modification request and supporting data, the Division of Water
Quality (Division) has decided to modify your permit. The special condition for remediation and sampling of
Penstock Sump Drains has been removed as the Division feels that you have fulfilled the intent of that condition.
You may now discharge stormwater from the sump after it has combined with river water and has been discharged
through the generators. Provided that no chemicals are ever added to this sump (nor any further contamination
discovered there), the stormwater will not be explicitly permitted through an outfall - you may continue operations as
you have been.
Please find enclosed the revised permit pages. The revised pages should be inserted into your permit. The
old pages may then be discarded. All other terms and conditions contained in the original permit remain unchanged
and in full effect. This permit modification is issued under the requirements of North Carolina General Statutes 143-
215.1 and the Memorandum of Agreement between North Carolina and the U. S. Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit modification are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days
following receipt of this letter. This request must be a written petition conforming to Chapter 150B of the North
Carolina General Statutes, filed with the Office of Administrative I-learings (6714 Mail Service Center, Raleigh, North
Carolina 27699-6714). Unless such demand is made, this decision shall be final and binding.
If you have any questions concerning this permit modification, please contact Natalie Sierra at (919) 733-
5083, extension 551.
Sincerely,
Otiginal Signed By
DPvid A, Goodrich
Alan W. Klimek
cc: Mooresville Regional Office, Water Quality Section
NPDES Unit
Central Files
1617 Maii Service Center, Raleigh, North Carolina 27699-1617
Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer VISIT us ON THE INTERNET @ http:llh2o.enr.state.nc.us/NPDES

Permit No. NC0081957
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
Yadkin, Inc.
is hereby authorized to discharge wastewater from a facility located at
Narrows Powerhouse
on NCSR 1704
Stanly County
to receiving waters designated as Yadkin River in the Yadkin -Pee Dee River Basin in accordance with
effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III and IV
hereof.
This permit shall become effective June 1, 2003.
This permit and authorization to discharge shall expire at midnight on January 31, 2004.
Signed this day May 14, 2003.
Ind Signs
Davidek
Alan W. Klimek, PE, Director
Division of Water Quality
By Authority of the Environmental Management Commission

t
Permit No. NC0081957
SUPPLEMENT TO PERMIT COVER SHEET
Yadkin, Inc.
is hereby authorized to:
1. Continue to discharge once -through cooling waters from outfalls 001, 002, 005, 006, and 007,
water from a sump drain (Outfall 003) located at Narrows Powerhouse, on NCSR 1704, Stanly County, and
2. Discharge from said treatment works at the location specified on the attached map into the
Yadkin River which is classified as class WS-IV and B waters in the Yadkin -Pee Dee River Basin.

NCDENR
H
Mr. Mark J. Gross
Alcoa Power Generating, Inc.
P.O. Box 576
Bailin, North Carolina 28009-0576
Dear Mr. Gross:
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
March 20, 2003
Subject: NPDES Permit Modification Request
Permit NC0081957
Narrows Powerhouse
Stanly County
The Division received your permit modification request on March 3, 2003. Ms. Natalie Sierra of the NPDES
Unit will review your application. Please note that your package did not include the NPDES permit
modification fee of $215.00. This fee must be submitted before your request can be completed. Ms.
Sierra will contact you if further information is needed about this project.
Please note that the NPDES Unit has currently has 3 vacant positions; the Unit has not been fully staffed
since the first quarter of 1998. Our remaining permit writers are currently carrying extremely heavy
workloads. While we do not expect severe delays in handling your request, be aware that your application is
one of many that Ms. Sierra is currently reviewing.
If you have any additional questions concerning the subject application, please contact Ms. Sierra at (919)
733-5083, extension 551.
cc: Central Files
NPDES Unit
Mooresville Regional Office / Water Quality Section
N. C. Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
Internet: h2o.enr.state.nc.us
Sincerely,
ChfrW ktroi
Christie R. Jackson
NPDES Unit
Phone: [phone], extension 538
Fax: [phone]
e-mail: [e-mail]

ov fNlyct NVS
ALCOA
February 26, 2003
MAR - 3 2003
N. C. Department of Environment and Natural Resources
Division of Water Quality
1617 Mail Service Center
Raleigh, N. C. 27699-1617
Attention: Dave Goodrich
Alcoa Primary Metals
Alcoa Power Generating Inc.
Yadkin Division
293 NC 740 Hwy
PO Box 576
Badin, NC 28009-0576 USA
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
9420 9515
RE: REQUEST FOR FINAL APPROVAL AND DISCHARGE
AUTHORIZATION
NARROWS POWERHOUSE - NPDES PERMIT # NC 0081957
Gentlemen:
As a follow-up to our January 16, 2003 meeting with representatives of the N. C.
Division of Water Quality to discuss the results of Alcoa Power Generating, Inc's
("Alcoa's") corrective action program for the Narrows Powerhouse, Alcoa is hereby
submitting a request for final approval of our corrective action measures which have been
completed at the Narrows Powerhouse, as well as modification of the NPDES permit for
the Narrows Powerhouse to receive authorization to discharge stormwater from the area
beneath the penstocks to the Yadkin River. Attached to this request are the results of the
monitoring which we discussed during our meeting and were previously submitted along
with the attached correspondence dated December 05, 2002 that discusses the
improvements which were made to the area beneath the penstocks. We respectfully
suggest that the language in the discharge authorization of the permit be amended to read
as follows:
Yadkin, Inc. is hereby authorized to: Continue to discharge once -through cooling waters
from outfalls 001, 002, 005, 006, and 007. Water from a sump drain (Outfall 003), and
stormwater from the area beneath the penstocks (Outfall 004) located at the Narrows
Powerhouse on NCSR 1704, Stanly County.
If you should have any questions or commeni
hesitate to contact me.
Very truly, your
Mark J. Gross
Vice -President of Operations
Alcoa Power Generating, Inc.
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C:IDOCUMENTS AND SETTINGSIMCCASWLILOC
FILES\0LK73\CORRECTIVE ACTION SCHEDULE -

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Z. T. Gibson
W. L. McCaskill
W. F. Brockway
J. A. Lease — PGH NAEHS
J. D. Morton — PGH NAEHS
M. A. Ross — PGH Legal
S. H. Myers - Knoxville
K. G. Hunsucker
C:IDOCUMENTS AND SETTINGSIMCCASWLILOCAL SETTINGSITEMPORARY INTERNET
FILESIOLK73\CORRECTIVE ACTION SCHEDULE STATUS REPORT 2-03.DOC

AI.COA
December 05, 2002
Alcoa Primary Metals
Alcoa Power Generating Inc.
Yadkin Division
293 NC 740 Hwy
PO Box 576
Badin, NC 28009-0576 USA
N. C. Department of Environment and Natural Resources
Division of Water Quality
1617 Mail Service Center
Raleigh, N. C. 27699-1617 CERTIFIED MAIL
RETURN RECEIPT REQUESTED.
Attention: T. Kerr Stevens 8368 8791
RE: CORRECTIVE ACTION SCHEDULE STATUS REPORT
NARROWS POWERHOUSE - NPDES PERMIT # NC 0081957
Gentlemen:
Alcoa Power Generating, Inc. ("Alcoa") is providing the Division of Water Quality with
a status report regarding the corrective action schedule as specified in section A(3) of
NPDES Permit No. NC 0081957 (the "Permit") for the Narrows Powerhouse.
In accordance with Section A(3) of the Permit, in January 2001, Alcoa completed the
planned improvements to the Penstock sump area which involved capping the area
around the sumps with gunnite, installation of silt fencing around the perimeter, and
installation of a high pressure sump pump. In furtherance of its obligations under the
Permit, Alcoa has recently completed the monitoring to confirm that the improvements
have been effective in reducing the concentrations of target constituents in the storm
water which discharges through the Unit #4 penstock. Alcoa commenced this monitoring
in January 2002, and a total of 12 samples were collected through October 2002. The
monitoring results, which are attached, show that there were no detectable concentrations
of target constituents in any of the samples with the exception of the February 28, 2002
sample. The February 28, 2002 sample had detectable concentrations of metals, which we
believe were the result of maintenance personnel changing the sample tap from PVC to
galvanized pipe. The sample tap was subsequently changed back to PVC prior to
collecting the March 22 sample and the problem was eliminated.
As a follow-up to this notification, we will be contacting you in the near future to set-up a
meeting during January 2003 to discuss these results as they relate to the existing permit.
If you should have any questions or comments regarding this information, please don't
hesitate to contact me.
Very truly yours,
Mark J. G`oss
Vice -President of Operations
Alcoa Power Generating, Inc.
P:IWINWORDIENVIRON\WATERIYADKINICORRECTIVE ACTION SCHEDULE STATUS REPORT
11-21-02.DOC

NARROWS PENSTOCK SAMPLING DATA (2002)
1124 217 2128 3/22 3/27 4/23 4/30 5/31 6128 7/31 8/30 10/31
LEAD (mgf) < 0.005 < 0.005
0.17 < 0.005
< 0.005 < 0.005
CADMIUM < 0 005
(mg/I) < 0.005 < 0.005 < 0.005 < 0.005 < 0.005
CHROMIUM
(mgli) < 0.01 < 0.01
< 0.01 < 0.01
< 0.01 < 0.01
< 0.005 < 0.005
< 0.005 < 0.005
< 0.01 < 0.01
< 0.005 < 0.005
< 0.005 < 0.005
< 0.01 < 0.01
< 0.005 < 0.005
< 0.005 < 0.005
< 0.01 < 0.01
ZINC (mgll) < 0.02
<0.02 0.47 <0.02 <0.02 <0.02 <0.02
<0.02 <0.02 <0.02 <0.02 <0.02
COPPER (mg/1) < 0.02 < 0.02 0.33 < 0.02 < 0.02 < 0.02 < 0.02 < 0.02 < 0.02 < 0.02 < 0.02 < 0.02
AROCHLOR
1016 (ugll) < 1.1 < 1.0
AROCHLOR
1221(ugf) <2.2 <2.0
AROCHLOR
1232 (ug/l) < 1.1 < 1.0
AROCHLOR
1242 (ugll) < 1.1 < 1.0
AROCHLOR
1248 (ug/I) < 1.1 < 1.0
AROCHLOR
1254(ugll) <1.1 <1.0
AROCHLOR
1260 (ug11) < 1.1 < 1.0
AROCHLOR
1268 (ugll) < 1.1 < 1.0
< 1.0 <1.0
< 2.0 < 2.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 <1.0
< 2.0 < 2.0
< 1.0 < 1.0
< 1.0 <1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 2.1 < 2.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 2.0 < 2.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 2.0 < 2.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 < 1.0
< 1.0 <1.0
< 1.0 < 1.0
< 1.0 < 1.0

•
NARROWS SUMP
CONCENTRATION
INCL /
ATTENUATION
FACTOR
.002
•
NARROWS SUMP DISCHARGE
(PCB'S)
WQS - FISH
COMSUMPTION
* LIMIT AS PER
12/23/99
CORRECTIVE
ACTION LETTER
.079
4
WQS -
PROTECTIVE OF
AQUATIC LIFE
1.0
4
SUMP DISCHARGE (DAILY AVG) = .0077 CFS
MINIMUM STREAMFLOW (7Q10) = 1202 CFS
ATTENUATION FACTOR = 156,104F�-�-
UNITS OF CONCENTRATION = PARTS PER TRILLION
CURRENT
ANALYTICAL
CAPABILITY
•
NARROWS SUMP
CONCENTRATION
► ng/1
357.0

fb •
NARROWS SUMP DISCHARGE
(TOTAL LEAD)
NARROWS
HIGHEST SUMP
CONCENTRATION
INCL /
ATTENUATION
FACTOR
I
.047
WQS -
PROTECTIVE OF
AQUATIC LIFE
1
25
4'
LIMIT AS PER
12/23/99
CORRECTIVE
ACTION LETTER
SUMP DISCHARGE (DAILY AVG) = .0077 CFS
MINIMUM STREAMFLOW (7Q10) = 1202 CFS
ATTENUATION FACTOR =156,104
UNITS OF CONCENTRATION = PARTS PER BILLION
NARROWS SUMP
CONCENTRATION
LOW END
•
NARROWS SUMP
CONCENTRATION
HIGH END
I I ► ug/1
33.78 45 7400
4

NARROWS
HIGHEST SUMP
CONCENTRATION
INCL /
ATTENUATION
FACTOR
•
NARROWS SUMP DISCHARGE
(TOTAL CADMIUM)
WQS -
PROTECTIVE OF
AQUATIC LIFE
NARROWS SUMP
CONCENTRATION
LOW END
LIMIT AS PER
12/23/99
CORRECTIVE
ACTION LETTER
NARROWS SUMP
CONCENTRATION
HIGH END
8.33 x 10-5
4
2.0
4
002'
SUMP DISCHARGE (DAILY AVG) = .0077 CFS
MINIMUM STREAMFLOW (7Q10) = 1202 CFS
ATTENUATION FACTOR = 156,104
UNITS OF CONCENTRATION = PARTS PER BILLION
•
► ug/1
<5.0 5.0 13.0

• •
NARROWS SUMP DISCHARGE
(TOTAL CHROMIUM)
NARROWS
HIGHEST SUMP
CONCENTRATION
INCL /
ATTENUATION
FACTOR
NARROWS SUMP
CONCENTRATION
LOW END
<10
WQS -
PROTECTIVE OF
AQUATIC LIFE
50
4
NARROWS SUMP
CONCENTRATION
HIGH END
160
•
LIMIT AS PER
12/23/99
CORRECTIVE
ACTION LETTER
► ug/1
984.3
SS,
SUMP DISCHARGE (DAILY AVG) = .0077 CFS
MINIMUM STREAMFLOW (7Q10) = 1202 CFS
ATTENUATION FACTOR = 156,104
UNITS OF CONCENTRATION = PARTS PER BILLION

• •
NARROWS SUMP DISCHARGE
(TOTAL COPPER)
NARROWS
HIGHEST SUMP
CONCENTRATION
INCL /
ATTENUATION
FACTOR
WQS -
PROTECTIVE OF
AQUATIC LIFE
LIMIT AS PER
12/23/99
CORRECTIVE
ACTION LETTER
NARROWS SUMP
CONCENTRATION
LOW END
NARROWS SUMP
CONCENTRATION
HIGH END
1.6 x 10-3
4
7.0
SUMP DISCHARGE (DAILY AVG) = .0077 CFS
MINIMUM STREAMFLOW (7Q10) = 1202 CFS
ATTENUATION FACTOR =156,104
UNITS OF CONCENTRATION = PARTS PER BILLION
9.2
4
<20
250
•
► ug/1

•
NARROWS
HIGHEST SUMP
CONCENTRATION
INCL /
ATTENUATION
FACTOR
1
.017
•
NARROWS SUMP DISCHARGE
(TOTAL ZINC)
WQS -
PROTECTIVE OF
AQUATIC LIFE
1
50
LIMIT AS PER
12/23/99
CORRECTIVE
ACTION LETTER
1
65
SUMP DISCHARGE (DAILY AVG) _ .0077 CFS
MINIMUM STREAMFLOW (7Q10) = 1202 CFS
ATTENUATION FACTOR = 156,104
UNITS OF CONCENTRATION = PARTS PER BILLION
NARROWS SUMP
CONCENTRATION
LOW END
1
210
•
NARROWS SUMP
CONCENTRATION
HIGH END
1
2700
ug/1

//fa/ ANC . - Try JV'&� f4'/ e,c mac`/c /tC,4;0/40/17
•
t tit/ itt•-
, PC13 tweia
1;75,-4 /I•e,t 14 IW7
/ I 64,0tat4 /4A- G�'ie�f�6k'c at/5 (f.ht
a tel/4,746",,,fp's ccll� cf
dmd die- /ea Sl/J/ �iz� �c ��' fre#01
.1r1441144-e ( •
icCt Act 2 fr to '' u/Ofi 044
171-4, ke /71.417 #tx- elfat40 a""6 tat--
pe6.7b c*-5. •
• /q71- (6 # feie3 5;:k
M m 60 7:6
7/q1 PC /1,11,007((,,, vy/
ZV' rerovir ("/) � pa./t;Nfi•c-,
726rie f 2w-4 # dice)le ,
L'4"c : i�sovtG�-Gv'C a /0/l'C
awed- 'trot neat,-��F4f
�c124 G�d�-- �yj 7 d' ;
r�� �� s�,r/
l+rt A u 1. 2 ") .
1101-41144 6d-ke 74fity /4W -10, le? l w-?f
'171 114 0 411,7he r 14007 i‘itc, 44/4 hp--
et/nA iviro
/71 jb7plc! helei Air, cr..
wnd MAL h((/, , 1//

sprit (7470)
Ow,
oc rp Pqte 114(ziekA

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT
BEFORE IMPROVEMENTS

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT
BEFORE IMPROVEMENTS
(I 4..
..
0 ' lir 4-‘ - ....n„...40' . .01; -'-'• , ' r• ' _ .1 , ,
."-"..tr" . ...." '''... -4:"V.,,, ..*: r....6 Iv• - • /,' -41r 2.:v" orAll
-....‘
0 ais -40%. ",^ -6 . 4 ' 'V.:, .• r + '
. 'N. . 4:•.," ., ... ..64 . .....
11. 6.. .41., • ....'- .444.N. ill..' J.?. 41:, -......r..'""-.. wt....%."17. .

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT
FEBRUARY 1999
• SLUDGE SAMPLE REMOVED FROM #4 PENSTOCK SUMP
CONTAINED PCB'S @ 22.4 PPM & LEAD @ 69 PPM
MARCH 1999
• WATER SAMPLE COLLECTED FROM #4 PENSTOCK SUMP
WAS NON -DETECTABLE FOR PCB'S - PQL 1.0 / 2.0 PPB.
TOTAL LEAD WAS PRESENT @ 0.3 PPM, AS WELL AS, OTHER
TRACE METALS
SEPTEMBER 1999
• WATER SAMPLE COLLECTED FROM BENEATH #4
PENSTOCK CONTAINED PCB'S @ .357 PPT & LEAD @ .045
PPM

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT
NOVEMBER 1999
• RECEIVED DRAFT NPDES PERMIT FOR THE NARROWS
POWERHOUSE
DECEMBER 1999
• RECEIVED LETTER NOTIFICATION FROM DWQ
ESTABLISHING DISCHARGE LIMITS FOR PCB'S AND
SEVERAL METALS. PCB LIMITS WERE EQUIVALENT TO
WATER QUALITY STANDARDS
JUKE 2000
• RECEIVED FINAL PERMIT FOR NARROWS POWERHOUSE
WHICH WE CONTESTED

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT
SEPTEMBER 2000
• MEETING 1N RALEIGH TO DISCUSS PLANS FOR
CORRECTIVE ACTIONS
OCTOBER 2000
• ALCOA SUBMITTED A SCHEDULE OF CORRECTIVE ACTION
WHICH WAS ADOPTED FOR INCLUSION IN THE NARROWS
NPDES PERMIT
OCTOBER 2001
• TASK PLAN CONSTRUCTION COMPLETED
JANUARY - OCTOBER 2002
• MONITORING PERFORMED

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT
AFTER IMPROVEMENTS

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT
AFTER IMPROVEMENTS

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT
AFTER IMPROVEMENTS

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT
AFTER IMPROVEMENTS
jWj•�4A+..,
-
-

NARROWS PENSTOCK SUMP IMPROVEMENT PROJECT
AFTER IMPROVEMENTS

NARROWS PENSTOCK SAMPLING DATA (2002)
1/24
LEAD (mg/0<'.0.005
< 0.005
CADMIUM '4 1
(mg/I < 0.005 <' 0.005 0.005 <10.005
CHROMIUM'
(mgll) <',0.01 <0.01 < 0.01
1 ZINC (mg/I) <10.02
COPPER
(mg/I) < 0.02
, 2/28
0.17
< 0.02 ;0.47
1
<10.01
<10.02
13/22 3/27
<10.005 < 0.005
< 0.005
<,0.01
< j 0.02
I4/23 4/30 15/31 6/28
<0.005
I 1
i I
<10.005
I
<'0.01
0.02
<I0.005 <0.005
1
< 0.005 1 <10.005
<;0.01 1<,0.01
<10.02
<,0.005
i
I I 1
<10.005
'7/31
<10.005
<10.005
<10.01 <0.01
I I
<10.02 <10.02 < 0.02
< 0.02 0.33 < i 0.02 < 0.02 < V 0.02 10.02 < 0 02
AROCHLOR 1
' 0 <.0 < 1.0 <,1.0 1 <'1.0
1016 (ug/l) 1.1 '� 1.0- <1
-'_.0 ----_ _ �<
----11.'1
- - -- I _------- ----
2.2 < <' <2.0 <12.1
�AROCHLOR � < c 2.0 2.0 2.0 < 2.0
1221 (ug/1) � � - - - -
AROCHLOR
1232 (ug/1) ! < 1.1
AROCHLOR'I
1242 (ug/l) < 1.1
<1.1.0 <1.0
< 1.0 < 1.0
<:1.0
<1.0
AROCHLOR '
(ug/I) <
,- I11.1 <1.0
1248<11.0 1 <i1.0
.AROCHLOR
(ug/I) i <,1.0 < 1.0 <11.0
1254u11 <'1.1
I_
AROCHLOR
1260 (ug/l) , < ! 1.1 -- - ---- �. - 11.0 < 1.0 �<'1.0
1
IAROCHLOR
11268 (ug/i) I < 1.1 <11.0 <11.0 1.0
< 1.0
<
1.0
<'1.0 <'1.0
11.0
<10.02 <10.02
_._
<1.0 <1.0
< 2.0 <'2.0 - <'2.0
<1.0 <_1.0 <'1.0
<11.0 <1.0
< 1.0 1 <11.0
<1.0
1.0 ' <11.0
1.0 <11.0
<',1.0
< 1.0
<1.0
<•1.0
<I'1.0
.0 <',1.0
<11.0
<1.0
<11.0 <;1.0
<11.0 <1.0
<'1.0 < 1.0 <11.0 , <11.0