Draft Overview of HPC Construction - EDF Hinkley Point

Dewatering of the working areas around the areas proposed for deeperexcavations during the main construction phase. Water collected from dewateringwould be discharged to the surface water drainage system described above. Construction of a temporary retaining structure along part of the northern edge ofthe main platform to retain the elevated main platform above the natural gradelevel. Development of a network of haulage roads to facilitate the movement of vehiclesand soil and rock materials around the site, including: a north-south haulage road which would allow for the transfer of excavatedmaterial to the southern part of the site; a haulage road network in the northern part of the site, which would vary inlocation and level to suit the ongoing platform development to eventually tieinto the site compounds as they are developed; and a service road around the perimeter of the site within the security fence toallow security and maintenance personnel access to inspect and maintain thefence line. Construction of site access points to the north-east of the site to provide the mainsite access during the site preparation works, with a second site access gate tothe south-east of the site to provide access for Heavy Goods Vehicles (HGVs)and deliveries to the site. Two roundabouts would be constructed to the north-eastand south-east of the site to serve these access points. Installation and commissioning of two batching plants; these will not be used forconcrete production with the exception of concrete tests until the DevelopmentConsent is granted.b) Temporary Jetty3.3.3 The applications for the temporary jetty provided for the construction and operation ofa temporary jetty extending off the north-west coast of the construction site including: Construction of haulage roads, including access to and along the beach tofacilitate construction of the onshore works; Piling for the jetty bridge and head, using tubular steel piles. The piles will beinserted using either the ‘drill and drive’ technique or into pre-drilled socketswhere they would be grouted into place. The onshore and foreshore piles wouldbe inserted using land-based equipment. The offshore piling would use a jack-upbarge; Construction of the jetty bridge, incorporating a roadway and conveyors foraggregate and cement; Construction of the jetty head, incorporating ship mooring provisions, aggregateand cement receipt equipment and facilities for jetty workers;DRAFT | Overview of HPC Construction | February 2011 13