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Attachment C - Amended Engineering Plans
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Original PDF page 18, section 2. The text section number identifies this passage in the reader.
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CLAY & SILT <3% (<0.05mm)
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VERY FINE SAND 5-30% (0.05-0.15mm)
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FINE SAND 10-30% (0.15-0.25mm)
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MEDIUM TO COARSE SAND 40-60% (0.25-1.0mm)
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BIO BASIN
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COARSE SAND 7-10% (1.0-2.0mm)
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FILTER AREA 27m2 PROPOSED FENCE REFER
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FINE GRAVEL <3% (2.0-3.4mm)
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LANDSCAPE ARCHITECT DWGS
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BIO BASIN
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FOR DETAILS
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2.3.1 AS4419 - 2003:
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FILTER MEDIA THAT DO NOT MEET THE FOLLOWING SPECIFICATIONS SHOULD BE REJECTED:
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1. ORGANIC MATTER CONTENT - AT LEAST 3% (w/w). AN ORGANIC CONTENT HIGHER THAN 5% IS
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CONCRETE OVERLAND
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LIKELY TO RESULT IN LEACHING OF NUTRIENTS.
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FLOW PATH PROVIDED
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2. pH - AS SPECIFIED FOR 'NATURAL SOILS AND SOIL BLENDS' 5.5 - 7.5 (pH 1:5 IN WATER)
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FOR 100% BLOCKAGE OF
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3. ELECTRICAL CONDUCTIVITY (EC) - AS SPECIFIED FOR 'NATURAL SOILS AND SOIL BLENDS' <1.2
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STORMWATER SYSTEM
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dS/m.
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4. ORTHOPHOSPHATE CONTENT <80 mg/kg
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5. TOTAL NITROGEN (TN) <1000 mg/kg 3.3m
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0.3m
NOTES:
MIN
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1. BIO-FILTER TO BE DENSELY VEGETATED TO A HEIGHT OF 250mm.
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RL 5.70
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2. PLANT SPECIES TO BE IN ACCORDANCE WITH LANDSCAPE ARCHITECTS DRAWINGS AND
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RL 5.58
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HEALTHY WATERWAYS WSUD TECHNICAL DESIGN GUIDELINES.
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3. 100 DIA. uPVC PIPES ARE TO HAVE 150mm x 3mm LONGITUDINAL SLOTS AT 350mm CENTRES AT 4
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Datum 5.00
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EQUAL SPACING AROUND THE CIRCUMFERENCE.
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4. ALL LEVELS NOTED ON BIO-FILTERS REFER TO FINISHED SAND LEVEL. SECTION X
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SCALE: 1:50
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BLOCKWORK RETAINING WALL.
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HEIGHT TO SUIT NEIGHBORING
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RL 5.70
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