ACID SULFATE SOILS
SUMMARY FORM A
INVESTIGATION AND MANAGEMENT PLANS
SECTION 1
REPORT DETAILS
What does this report cover?
Investigation
Soil Management
Dewatering Management
If investigation only, complete sections 1 and 3. If combination please complete all sections.
SITE LOCATION DETAILS
Site name: (e.g. where site may be known by a common/ business name)
Lot No.
and/or
Street No.
Street Name:
Certificate of Title Reference (Volume/ Folio) or
equivalent:
(attach a copy)
Suburb /
Town:
Postcode:
Local
Government:
Crown Reserve: (if applicable)
NOTE
If Certificate(s) of Title (CoT) have changed since the initial Acid Sulfate Soils Assessment Site
Summary Form was submitted, the new CoTs need to be attached to this document.
CURRENT OWNER / OCCUPIER DETAILS
Site Owner:
Street No.
Suburb /
Town:
Street Name:
Postcode:
Site
Occupier:
Street No.
Suburb /
Town:
Street Name:
Postcode:
SITE STATUS
Historic/previous land use (e.g. market gardens,
industrial, landfill, marina):
Current land use (e.g. market gardens, industrial,
landfill, marina):
Page 1 of 8
Department of
Environment Regulation
ACID SULFATE SOILS
SUMMARY FORM A
INVESTIGATION AND MANAGEMENT PLANS
INVESTIGATION HISTORY
Have previous site investigations been conducted? (Y/N) -
if yes, please provide details below)
Report title, date and author
(include whether any ASS testing
formed part of the investigation)
PROPOSED DEVELOPMENT
Proposed land use (e.g. high density
residential/childcare facility, ornamental
lake, canal development)
What is the nature of the proposed
earthworks (e.g. installation of deep sewer,
cut and fill, excavation for ornamental lake)?
Does the development involve excavating or removing more than 100m 3 of soil or sediment? (Y/N)
Does this development involve a marina, canal estate or harbour? (Y/N)
Will soil disturbance extend below the watertable? (Y/N)
Is dewatering of soils required? (Y/N)
SITE CHARACTERISTICS
What is the lowest elevation of the natural ground surface on site?
mAHD
Is there any evidence of a disturbed ASS landscape?
e.g. scalds, jarosite, iron mottles, acidic water, salt effervescence, tree deaths, etc.
What are the groundwater conditions (unconfined, confined, perched or
ephemeral aquifer)?
What is the known depth to the water table?
Are there sensitive receptors nearby? (e.g. water courses, conservation wetlands,
Ramsar sites, significant local habitats, UWPCA, irrigation bores, etc)?
What is the predominant geology identified at the site?
Page 2 of 8
Department of
Environment Regulation
ACID SULFATE SOILS
SUMMARY FORM A
INVESTIGATION AND MANAGEMENT PLANS
SOIL INVESTIGATION
Were soil investigation sample intensities carried out in accordance with Identification and
investigation of acid sulfate soils and acidic landscapes (DEC, May 2009), i.e. field testing at
every 0.25m and confirmatory laboratory samples every 0.5m down the soil profile? (Y/N)
If No, please justify:
Was the laboratory NATA-accredited for ASS analysis? (Y/N)
If No, please justify:
Was a laboratory detection limit of 0.005%S used for sandy soils 1 ? (Y/N)
If No, please justify:
Laboratory details
Has the site assessment identified ASS materials? (Y/N)
Is an ASS Management Plan necessary for the proposed site works? (Y/N)
Are the following in accordance with DER’s ASS guideline series? Please indicate the
page number they appear on in the report.
Yes –
Page #
No
Not applicable
or other
comment
Method for selecting soil samples for laboratory analysis
Discussion of laboratory Quality Control results (e.g. method blanks)
Discussion of field Quality Control results (e.g. field duplicates and
blanks/rinsates)
Field instrument calibration methods
Table listing selected assessment criteria (and references for these criteria)
Basis for, and appropriateness of, assessment criteria selected
Explanation of any uncertainties associated with testing results
Table summarising all soil field and laboratory results
(with any exceedences of assessment criteria clearly highlighted)
Laboratory certificates and NATA accreditation details
Signed copy of chain-of-custody forms
Photographs/descriptions of soil profiles, identifying each stratum
Bore hole logs for each sample location
Co-ordinates of each bore hole/sample location in MGA94
Site plan showing bore hole locations, sample identification numbers,
sampling depths and exceedences of assessment criteria
3-D map & cross-section of ASS occurrence/absence including outline of
area of proposed disturbance
1A
laboratory detection limit of 0.005%S is recommended for sandy soils that have no acid buffering capacity. Where concentration is
less than 0.01%S and TTA is in excess of 6.2 mol H+/tonne (equivalent to 0.01%S), the pHFox values should be used to determine if soil
liming is required.
Page 3 of 8
Department of
Environment Regulation
ACID SULFATE SOILS
SUMMARY FORM A
INVESTIGATION AND MANAGEMENT PLANS
WATER QUALITY INVESTIGATION
Were water quality investigations undertaken? (Y/N)
If Yes, were the investigations undertaken in accordance with Treatment and
management of soils and water in acid sulfate soil landscapes, DEC, June 2011?
(Y/N)
If NO, please justify:
Was the laboratory NATA-accredited for the water quality analyses undertaken?
(Y/N)
If NO, please justify:
Laboratory details
Are the following in accordance with DER’s ASS guideline series? Please indicate the
page number they appear on in the report.
Yes –
Page #
No
Not
applicable or
other
comment
Discussion of laboratory Quality Control results (e.g. method blanks,
surrogates, spikes)
Discussion of field Quality Control results (e.g. field duplicates and
blanks/rinsates)
Field instrument calibration methods
Groundwater well construction and completion details
Groundwater well purging and sampling methods
Surface water sampling methods
Table listing selected assessment criteria (and references for these criteria)
Basis for, and appropriateness of, assessment criteria selected
Explanation of any uncertainties associated with testing results
Table summarising all groundwater field and laboratory results
(with any exceedences of assessment criteria clearly highlighted)
Laboratory certificates and NATA accreditation details
Signed copy of chain-of-custody forms
Site plan showing groundwater monitoring wells/surface water sample locations
and exceedences of assessment criteria
Site plan showing extent of groundwater/surface water acidity and/or elevated
metal concentrations including outline of area of proposed disturbance
Page 4 of 8
Department of
Environment Regulation
ACID SULFATE SOILS
SUMMARY FORM A
INVESTIGATION AND MANAGEMENT PLANS
SECTION 2
SOIL MANAGEMENT
What are the lowest field and laboratory pH and peroxide pH
values observed within the proposed areas of disturbance across
the site?
pHfield:
pHfox:
pHKCl:
pHox:
What laboratory analysis method was used to determine potential and
actual acidity?
Are acid sulfate soils present in the proposed area of disturbance, including the area
impacted by the estimated cone of groundwater depression? (Y/N)
If YES, please show maximum calculated net acidity by entering the following values in units of %S:
Existing acidity:
Potential acidity:
Net Acidity:
What is the maximum depth of the proposed excavation/disturbance?
mBGL
mAHD
What are the proposed method/s of soil disturbance/works?
Trenchless technologies
Sheet piling
Open trenching/excavation
Dredging
Other
Is soil neutralisation necessary based on the net acidity?
(Y/N)
If Yes, what neutralising material is anticipated to be
used for soil treatment?
kg CaCO3/m3
What is the liming rate?
Does the liming rate incorporate ENV calculations?
(Y/N)
Are the liming rate calculations attached? (Y/N)
How will the neutralising material be applied and
combined to ensure thorough mixing?
What is the proposed duration of stockpiling of ASS
materials?
Are the following in accordance with Treatment and management of soils and water
in acid sulfate soil landscapes (DEC, June 2011) Please indicate the page number
they appear on in the report.
Yes –
Page #
No
Not applicable or
other comment
Construction of a limestone treatment pad
Validation sampling program for treated soils/sediments
On-site treatment
(volume)
Are soils being treated on-site or off-site?
Off-site disposal/treatment
(volume)
If treatment or disposal of ASS off-site is proposed,
which DER-approved facility will be accepting this
material?
Page 5 of 8
Department of
Environment Regulation
ACID SULFATE SOILS
SUMMARY FORM A
INVESTIGATION AND MANAGEMENT PLANS
SECTION 2 (Cont….)
DEWATERING MANAGEMENT
Is any groundwater abstraction, dewatering of soils or drainage anticipated? (Y/N)
If dewatering is proposed, has a licence to take groundwater been applied for from the Department of
Water? (Y/N) Please attach a copy.
What is the minimum depth to groundwater across the site?
m
What is the anticipated maximum groundwater drawdown?
m
What is the expected volume (KL) of dewatering?
KL
What is the expected duration (days) of dewatering?
days
What is the expected rate of dewatering?
L/s
What is the anticipated maximum radial extent of the cone of
groundwater depression?
m
What method of dewatering is anticipated? (e.g. spear point, sump-pump)
What is the system for treatment of the dewatering effluent?
(i.e. lime-dosing unit, settlement basin, in-line treatment tanks, flocculants, fused-silica
filtration, etc)
What is the method of disposal of the dewatering effluent?
(i.e. recharge trench, infiltration basin, dust suppression, discharge to sewer etc)
If dewatering effluent is to be neutralised, what is the proposed
neutralising agent to be used?
If dewatering effluent is to be neutralised, what is the proposed method of
applying neutralising agent to dewatering effluent?
Are a minimum of 3 groundwater wells installed (or proposed to be installed) and are
these appropriately located in relation to the proposed works such that they will be able
to determine any impact of site works on groundwater? (Y/N)
Are the following in accordance with Treatment and management of soils and
groundwater in acid sulfate soil landscapes (DEC, June 2011). Please indicate page
number of the report on which they appear.
Yes –
Page #
No
Not applicable or
other comment
Yes –
Page #
No
Not applicable or
other comment
Laboratory analysis suites for dewatering effluent quality monitoring
Dewatering effluent monitoring frequencies
Assessment/action criteria for dewatering effluent
Dewatering contingency plans
Please indicate page number or document attachment number where the following
can be found:
Site plan indicating where the monitoring wells will be located in relation to
the proposed site works
Page 6 of 8
Department of
Environment Regulation
ACID SULFATE SOILS
SUMMARY FORM A
INVESTIGATION AND MANAGEMENT PLANS
SECTION 2 (Cont….)
GROUNDWATER MANAGEMENT
Are the following in accordance with Treatment and management of soils and
groundwater in acid sulfate soil landscapes, DEC, June 2011. Please indicate page
number of the report on which they appear.
Yes –
Page #
No
Not applicable or
other comment
Groundwater baseline/background water quality monitoring program
Are the groundwater wells used for the baseline/background water quality
monitoring appropriately located in relation to the proposed works such
that they will be able to determine any impact of site works on
groundwater? (Y/N)
Groundwater quality monitoring program
Laboratory analysis suites for groundwater quality monitoring
Table(s) summarising all field and laboratory water quality results
Site-specific contingency plan (including groundwater quality action
criteria)
How many baseline monitoring events will have occurred prior to
commencement of dewatering? (e.g. 1, 2 to 4, all seasons)
Are there groundwater uses or local sensitive receptors and/or receiving environments within a 1 km
radius of the site or within 1 km of the cone of groundwater depression (e.g. water courses, conservation
wetlands, significant local habitats, UWPCA, irrigation bores etc)? (Y/N)
If YES, please list and provide page number(s):
Do any groundwater quality parameters indicate that there has been previous oxidation of ASS in the
local area? (Y/N)
If YES, please state parameter(s), and maximum
concentrations/ratios
Do any groundwater quality parameters exceed non-potable domestic water use criteria? (Y/N). See
Assessment levels for soil, sediment and water, DEC, February 2010.
If YES, please state parameter(s) and maximum
concentrations
Do any groundwater quality parameters exceed fresh water or marine water criteria? (Y/N). See
Assessment levels for soil, sediment and water, DEC, February 2010.
If YES, please state parameter(s), criteria
exceeded and maximum concentrations
What is the proposed post-dewatering
groundwater monitoring schedule?
Page 7 of 8
Department of
Environment Regulation
ACID SULFATE SOILS
SUMMARY FORM A
INVESTIGATION AND MANAGEMENT PLANS
SECTION 3
DECLARATION:
Acid Sulfate Soil investigations and the associated management plans were conducted and developed in accordance
with current Best Management Practice and current DER guidelines. The information contained in this summary form is a
true and correct representation of the information contained within the attached report(s) and document(s). Any concerns
relating to potential impacts to human health, the environment and environmental values are clearly highlighted within this
form and management plan. I am competent to undertake this investigation and/or prepare this management plan.
Do you consent to DER using the investigation results provided in your report (e.g. soil bore logs
and ASS field and laboratory results) to improve the DER’s ASS Risk Map coverage? (Y/N)
Full name of Environmental Consultant / Agency
submitting the report:
Supervising / Principal Environmental Consultant
Name:
Signature:
Date:
M AI L TH E CO MPLE TE D FO RM TO :
Acid Sulfate Soils Section
Department of Environment Regulation
Locked Bag 33
Cloisters Square
Perth WA 6850
Page 8 of 8
Department of
Environment Regulation