Gasum Annual Report 2009

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THEmE: HÄmEENLiNNA–LEmPÄÄLÄ PARALLEL PiPELiNE THE WEsTERN mARsH HARRiER (Circus aeruginosus) The Western Marsh Harrier is a large bird with a wingspan of 115–140 cm that is classiﬁed as a near threatened species. The Finnish population is estimated to consist of 600–800 couples.The Western Marsh Harrier breeds in shallow and extensive reedbeds in nests made of sticks and reeds.Their young are born in late June. According to the studies conducted, the Hämeenlinna-Lempäälä pipeline did not pose a threat to the Western Marsh Harrier’s breeding area on the northern shore of the Makkaranselkä section of Lake Vanajavesi. Efforts were made to perform underwater work in a manner minimising any disturbance to the breeding of this valuable species. WATER PERmiT GRANTED fOR UNDERWATER WORk iN LAkE vANAJAvEsi The middle section of the pipeline needed to be constructed underwater across the makkaranselkä section of Lake vanajavesi. in march 2009 the Western finland Environmental Permit Authority issued Gasum a permit to conduct underwater construction. As laid down in the terms and conditions of the permit, the local waterways protection association monitored any impacts on the waterways during construction work.Water quality monitoring took place once a week and covered issues such as turbidity, levels of detrimental elements and the spread of solids. Any effects on local fish and crayfish stocks were also monitored. Aerial photos of Lake vanajavesi were also taken several times during the summer. According to the final report, the impacts of pipeline construction on the waterways were rather small. NATURAL GAs PiPELiNE LAiD DOWN ON THE bOTTOm Of LAkE vANAJAvEsi During the first weeks of July, natural gas pipes were floated across the makkaranselkä section of Lake vanajavesi and successfully laid down on the bottom of the lake. Each 12 m long, the steel pipes were welded on the shore to create 350-m prefabricated pipeline elements that were joined and floated across the lake using pontoons. in total the underwater pipeline laid down is almost four kilometres long. 03/2009 06/2009 07/2009 08/2009 09/2009 PARALLEL PiPELiNE COmPLETED AND TAkEN iNTO sERviCE 26

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