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Brookvale Oval Investigation - Warringah Council - NSW Government

Brookvale Oval Investigation - Warringah Council - NSW Government

2. Condition Assessment

2. Condition Assessment 2.1 Condition The existing field is rectangular with rounded corners providing a grassed surface approximately 87 metres wide and 137 metres long (1.2 ha). This provides a football playing area of 68 metres x 116 metres, with a safety buffer of approximately 8 metres between the boundary and the fence. The field has its longitudinal axis running slightly east of north-south, and has a very slight slope from the north-west corner to the south-east corner. Appendix 1 contains a plan of the oval. • Ground Cover The turf cover is predominantly kikuyu with a scattering of carpet grass. The turf cover has a very dense thatch over the whole field which is providing a very spongy surface. In many places the mower has scalped into the thatch, leaving only kikuyu stalks. An area of synthetic turf (approx. 10metres x 4metres) has been laid at the players’ entry to cope with the continual traffic. Abutting the in-field side of this synthetic turf is an area of very poor turf cover. Little kikuyu is present and there is tufty weed grasses dominating. Appendix 2 contains photographs illustrating items relating to current condition. • Soil Profile Eight test holes were dug to determine the nature of the soil profile. This has been illustrated in the diagram below. 0 1 2 3 4 5 6 7 8 Depth (mm) -200 -400 -600 Thatch Grey sandy loam Clay 3 2 1 4 5 North 8 7 6 Brookvale Oval Investigation Final Report (February 2010) Page 5

The presence of the thatch material over the field is quite typical of a mature kikuyu turf sward, but the density of this layer will impact significantly on the performance of the soil profile, and on the actual playing surface. The thatch layer will retain moisture, reducing the infiltration rate of the profile. In terms of playing surface performance, the thatch will provide a softer surface but this will result in a heavier playing surface and potential energy-sapping of player performance. The test holes show a variable depth of sandy loam topsoil ranging from 290mm – 460mm over a sub-base of clay loam. Laboratory tests show that the sandy loam topsoil has a drainage capacity of 11 mm/hr which is very slow. The desired drainage capacity of a rootzone material in a high quality sportsfield is 200 - 300 mm/hr. It was reported that there is no sub-surface drainage system in this field so the only way for excess water to move away is via the very slow infiltration or across the surface. This can lead to surface damage particularly if traffic occurs during periods when the soil is saturated. • Soil Nutrient Analysis An analysis of the topsoil was carried out and the results are: Ideal Ideal Oval Range Range Oval pH (water) 6.0 - 7.0 5.7 Trace Elements Electrical Conductivity (mS/cm) < 0.27 0.04 Sulphur (ppm) 10 - 50 4 Total salts (ppm) < 800 119 Zinc (ppm) 1 - 10 4.1 Phosphorus (Colwell) (ppm) 50 - 80 210 Copper (ppm) 1 - 10 1.5 Exchangeable cations Manganese (ppm) 0.1 - 4.0 6.0 Potassium (meq /100g) 0.5 - 0.6 0.2 Iron (ppm) 10 - 60 240 Calcium (meq /100g) > 3.5 1.4 Boron (ppm) 0.3 - 1.0 0.1 Magnesium (meq /100g) 0.8 - 1.0 0.6 Chloride (ppm) < 100 22 Calcium Magnesium Ratio 2 - 5 2.3 Cation Exchange Capacity (meq/100g) > 5 2.3 Base Saturation Levels (% cations) Potassium (%) > 10 7 Calcium (%) 60 - 70 60 low acceptable high Magnesium (%) 20 - 23 26 Sodium (%) < 5 3 These results show: • strongly acid pH – needs lime to modify acidity; • normal level of Total Salts – no concern; • high phosphorus level – sufficient for turf maintenance, no remedial action; • very low potassium level – needs improvement; • very low calcium and magnesium levels – extra calcium and magnesium needed; • low sodium level – no concern; • other elements generally adequate for turf growth. Brookvale Oval Investigation Final Report (February 2010) Page 6

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