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The N22 Ballincollig Bypass scheme involves the construction of a new dual carriageway between Bishopstown (Ballinaspig More townland) and Ovens (Knockanemore townland) and covers an area of 750,000 square metres. A programme of advance archaeological investigation was undertaken prior to construction under licence number 01E0546 and involved excavating a 2m wide test trench along the centre line of the proposed route with offset trenches to the edge of the road-take every 25m on alternate sides. In addition to the five sites of archaeological potential identified through the archaeological impact assessment, eleven sites identified during the course of this investigation were subsequently excavated. Archaeological monitoring of the main engineering earthworks programme commenced in March 2002, under licence number 02E0058. During the course of monitoring two phases of archaeological activity were exposed at Curraheen 4. The first contained the remains of a substantial fulacht fiadh. The burnt mound measured 9.4m in length, 6.0m in width and 0.84m in depth and contained a single bronze disc-headed pin (02E1297:010:1) indicating that the site was in use during the Late Bronze Age. A charcoal sample from the burnt mound also returned a Late Bronze Age date of Cal BC 1000–800. A number of pits and a subrectangular trough were also exposed. Analysis of the wood retrieved from the site revealed that oak and alder were the predominant species present on site. The remains of some hazel nuts were also revealed while bone fragments of cattle, sheep/goat and deer were also recovered. The second phase consisted of three pits and a deposit of burnt mound material. Charcoal from the site returned an Iron Age date of Cal BC185 – 85AD suggesting that burnt mound technology may have continued into the Iron Age. Wood analysis revealed that alder, birch and willow were the predominant species present within the site. Their presence within both sites indicates that the local environment was largely wet or boggy throughout the Late Bronze Age–Iron Age period.