201010 ANG october env report

anglesea river
understanding our local river system
alcoa anglesea
2010
environment report
october
ANGLESEA ENVIRONMENT REPORT OCTOBER 2010
air
Air Monitoring
Stack Monitors
Average
Maximum
Opacity g/min 10-minute average
0.062
0.117
Stack SO2 kg/min 1-hour average
Licence limit 100kg/min
75.81
89.34
Ambient Monitors
SO2 1 hour ppb
Average
Maximum
Community Centre
2
113
Primary School
1
80
Mt Ingoldsby
1
95
Scout Camp
1
133
Camp Wilkin
3
145
Camp Road
3
144
Ambient Monitors
SO2 Maximum 1 hour averages (ppb)
Date
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Comm Centre
7
3
40
69
6
69
1
2
1
2
84
2
2
79
2
1
1
2
1
9
22
113
2
1
4
1
3
4
36
0
1
Primary School
6
3
0
26
1
21
0
0
0
0
80
72
0
20
1
0
0
0
0
0
37
23
0
0
0
0
0
0
11
0
0
Mt Ingoldsby
2
3
95
1
0
33
0
0
0
3
2
0
0
2
14
0
0
0
0
8
0
3
0
0
0
0
0
0
60
0
0
Scout Camp
5
4
1
3
7
5
133
78
14
1
0
7
0
0
0
0
2
18
0
10
1
41
9
0
0
75
0
1
3
0
0
Camp Wilkin
5
5
58
71
3
46
0
1
2
1
145
2
1
75
3
3
3
1
3
12
2
3
3
3
2
3
3
6
110
4
3
Camp Road
7
4
0
2
0
3
0
0
1
0
2
63
0
66
0
0
0
0
3
15
77
144
2
3
4
12
3
5
14
2
3
EPA Air Quality Objective 200
Alcoa Local Standard 170
ANGLESEA ENVIRONMENT REPORT OCTOBER 2010
water
Water Storage
Barwon Water storage levels for the Geelong system at 72.9% capacity. Stage 1 water restrictions apply.
Water discharge
ML
October
Total
Ashponds (SP1)
128.5
1134.6
Mine (SP4)
0
0
Water Monitoring
13/10/2010
SP1
Ashpond
SP4
Mine
SP3
EPA Limit
Lab Result
4 - 10
7.1
Susp Solids
100
4
100
discharge
30
<4
Colour
50
4
50
at
50
7
Aluminium
10
0.22
10
time
5.5
14*
Iron
10
0.19
20
of
4.0
0.14
Zinc
0.4
0.24
2.0
sampling
0.3
0.43*
pH
EPA Limit
3
Lab Result
Final
9
EPA Limit
No
5
Lab Result
9
4.6*
* NB: The results at SP3 appear to be outside EPA limits, but this is due to the pH levels in the natural tributaries to the Anglesea River impacting on our licenced discharge point. Alcoa Anglesea’s EPA licence includes
provision for such conditions. This is a natural phenomenon that has generated much interest locally, to learn more visit: www.ccma.vic.gov.au/documents/AngleseaRiverFAQ.pdf .
WATER WATER USE PER MONTH (ML)
JAN
FEB
MAR
APR
MAY
JUNE
JULY
AUG
SEPT
OCT
Town Water
1.2
1.0
2.7
0.8
0.8
0.8
0.8
1.9
0.6
0.7
Bore Water
284
258
283
244
237
210
203
155
181
190
Mine Water
112
52
98
72
102
76
85
97
90
101
NOV
DEC
ANGLESEA ENVIRONMENT REPORT OCTOBER 2010
anglesea river
This spring has been an unusual time for water in and around
Anglesea. Heavy rain has been a rare occurrence locally in the past
few years due to drought. However heavy spring rains this year have
caused some unfortunate natural occurrences in Salt and Marshy
Creeks, and subsequently in the Anglesea River.
Salt and Marshy Creeks are tributaries to the Anglesea River, and
actually converge and join together in a wetland we call the Mixing
Zone within our operations and then proceed as the Anglesea River
and discharge to the ocean. Upstream of Alcoa Anglesea, and all
throughout the Anglesea Heath, the soils are called acid sulphate soils.
DSE can provide more information on acid sulphate soils to interested
readers.
After a prolonged dry period followed by heavy rains, this type of soil
can release sulphuric acid which then lowers the pH of local
waterways. The pH can decrease to as low as 3. Records held since
1966 have shown that similar low pH levels have occurred periodically
in the local catchment.
Regular monthly water sampling conducted in September and October
confirmed that pH readings were unusual. Whilst the discharge from
our Ash Ponds (at SP1) was normal, the result seen where the
The table following shows the results of water samples taken at SP1,
SP3, Marshy Creek and Salt Creeks. Due to the results seen at Salt
Creek, the results at SP3 are within our EPA licence requirements due
to the previous clauses.
Water
Monitoring
Marshy
Creek
Salt Creek
SP1
SP3
Lab Result
Lab Result
Lab Result
Lab Result
pH
3.5
3.9
7.1
4.6
Susp Solids
<4
<4
4
<4
Colour
4
35
4
7
Aluminium
2.7
81
0.22
14
Iron
0.72
1.4
0.19
0.14
Zinc
0.036
1.8
0.24
0.43
13/10/2010
The effect on the Anglesea River
leave our site (SP3 Licence Point) was abnormal.
As the table following shows, the pH at SP1 was 7.1 but the pH at SP3
was 4.6 this is very rare. However, because this has occurred in the
past, our EPA licence does include provision for these conditions. It
includes a clause which states that if the background levels measured
at Marshy Creek or Salt Creek are outside of the limits specified in the
licence, then water can only be discharged from Alcoa premises if:
the pH at the SP3 licence point is not lower than the pH
measured at Marshy Creek/Salt Creek; and the other
measured values (ie aluminium, iron and zinc) at SP3 licence
point do not exceed the values measured at Marshy
Creek/Salt Creek.
PLANTS OF THE ANGLESEA HEATH
SOUTH AFRICAN WEED ORCHID (Disa bracteata)
Size:
Distribution:
Habitat:
Form:
Foliage:
Flowers:
Did you know:
30 - 50cm
native to South Africa, first found in
Albany Western Australia in 1944,
first recorded in Victoria in 1991, now
ten infestation sites in Victoria
grows readily with a wide range of
flora, invades bushland and pastures
and is attracted to disturbed sites
perennial terrestrial orchid
lower leaves 5 – 15 cm long
15 - 30 on a cylindrical spike 5 20cm long, resembles a greenishbrown asparagus spear
October - December
A new population discovered at
Fraser Avenue is a significant threat
to native orchids in the area. More
than 100 orchid species are found in
the Anglesea Heath representing half
of the State’s orchid flora.
The low pH of the water in Salt and Marshy Creeks resulted in fish
deaths in the Anglesea River. The gills of the fish are damaged by
contact with the acidic water. The phenomenon of fish deaths has
occurred several times before locally and each instance has occurred
after heavy rainfall events. A range of government agencies are
investigating the most recent event in Anglesea and confirmed the
natural phenomenon as the cause of the fish deaths. Alcoa has and will
to continue to participate in this process. More information on this
event
can
be
found
at:
http://www.ccma.vic.gov.au/documents/101105_Anglesea_FAQs9Nov
2010No2.pdf
SOUTH AFRICAN WEED ORCHID
ANGLESEA ENVIRONMENT REPORT OCTOBER 2010
LAND
RAINFALL (mm)
Long Term Average
2010 Rainfall
JAN
FEB
MAR
APR
MAY
JUNE
JULY
AUG
SEPT
42.9
41.6
40.2
51.9
59.9
59.1
63.0
65.8
66.9
68.9
5.0
67.0
63.0
57.0
30.2
71.8
47.4
121.2
56.8
141.1
OCT
NOV
DEC
WATER
TOWN WATER USE (ML)
2000
2009
2010
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
Amenity Water Use
1.0
0.2
0.3
0.1
0.1
1.7
0.1
0.1
0.1
0.1
0.1
0.2
0.1
Process Water use
2.0
1.1
0.6
1.1
0.9
1.1
0.7
0.7
0.7
0.7
1.8
0.4
0.6
NOV
DEC
AIR
GREENHOUSE GAS (GHG) TOTAL (Mt) & GHG EMISSION EFFICIENCY (t/mwH)
GHG t
GHG t/MWh
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
f orecast
1227846
1265103
1504860
1448793
1468098
1309674
1491486
1396713
1452351
1361632
1447777
1.24
1.19
1.21
1.21
1.20
1.21
1.20
1.18
1.23
1.22
1.19
ANGLESEA ENVIRONMENT REPORT OCTOBER 2010
environmental improvement
Environmental Management Targets
October
2010 Total
2010 Forecast
2010 Target
Reportable Environmental Incidents
0
0
0
0
Env Near Miss vs Env Incident Run Rate (ratio)
3
4.3
4.3
2.5
100
100
100
90
October
2010 Total
2010 Forecast
2010 Target
Ambient SO2 (no. readings > 200ppb)
0
0
0
0
Stack SO2 (no. hrs > 100kg/min)
0
0
0
0
SO2 Load Reductions (lost MWh)
24
170
204
NA
1.19
1.19
1.19
1.20
0
0
0
0
October
2010 Total
2010 Forecast
2010 Target
Town Water (ML)
0.7
11.2
13.4
14.2
Bore Water (ML)
190
2245
2693
4000
Waste Targets
October
2010 Total
2010 Forecast
2010 Target
Waste to Landfill (t)
0
3.32
4.0
8
Solid Prescribed Waste to Landfill (t)
0
0
0
0
Monthly EHS ASAT Audit Completion (%)
Air Emission Targets
GHG Efficiency (t CO2 e/MWh)
Opacity (10 min av > 0.25g/m3 norm ops)
Water Targets
Mine Rehabilitation Targets
2010 Total
2010 Target
2010 Area to Clear (ha)
3.1
3.1
2010 Area to Rehabilitate (ha)
5.4
> 3.1
OUR ENVIRONMENT AND OUR EMPLOYEE
Hi Nicci! How do you interact with the EPA at work?
Most of my interactions with the Authority are in regard to
ensuring compliance with the site’s EPA Licence. I report
monitoring results and how we comply with policies, in addition to
ensuring open communication with our client manager.
Why did you notify the EPA of low local pH readings recently
even though Alcoa remained in compliance with its licence?
During our routine surface water testing at site, we noted high
water flow in both Salt and Marshy Creeks, which we haven’t
seen for some time. Testing of the water in these creeks
upstream of the power station indicated very low pH levels, due to
the naturally occurring acid sulphate soils. Whilst testing of our
discharge water confirmed compliance with our EPA Licence, we
notified the EPA as we have seen fish deaths previously in the
Anglesea River when low pH levels are detected in the natural
tributaries.
Do we do this sort of proactive communication in any other
instances/circumstances?
Yes we do. Whenever we observe, measure or detect changes in
our environment that may impact on the quality of local air, water,
land, visual amenity, fauna, flora or the community, we proactively
report to EPA. This assists the Authority by alerting them to
potential incidents and provides background information should
they receive any enquiries.
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