down town / porsgrunn sentrum sør miljøundersøkelse

Down Town og Porsgrunn sentrum sør, KU
Innspill til konsekvensutredning
MULTICONSULT
Innholdsfortegnelse
1. Innledning ...........................................................................................................................................4
2. Utførelse av Fase 1-undersøkelse........................................................................................................4
3. Eiendoms- og områdebeskrivelse .......................................................................................................6
3.1 Generelt ...............................................................................................................................6
3.1.1 Topografi. Grunnforhold. Drenasje. ....................................................................................7
3.2 Historikk ..............................................................................................................................7
3.2.1 Delområde A1 – Fredneshalvøya ........................................................................................8
3.2.2 Delområde A2 – Sundjordetkanalen..................................................................................11
3.2.3 Delområde B – Grängeshallen – Skippergata....................................................................11
3.2.4 Delområde C – Bratsberg Brygge – Down Town..............................................................12
4. Registreringer og vurderinger ...........................................................................................................13
4.1 Generelt .............................................................................................................................13
4.2 Delområde A1 – Fredneshalvøya ......................................................................................13
4.3 Delområde A2 – Sundjordetkanalen..................................................................................16
4.3.1 Sedimenter.........................................................................................................................16
4.3.2 Vannkvalitet.......................................................................................................................16
4.3.3 Fjærmygg...........................................................................................................................18
4.4 Delområde B – Grängeshallen – Skippergata....................................................................19
4.5 Delområde C – Bratsberg Brygge – Down Town..............................................................22
5. Miljøtekniske vurderinger.................................................................................................................26
5.1 Generelt .............................................................................................................................26
5.2 Delområde A1 – Fredneshalvøya ......................................................................................27
5.3 Delområde A2– Sundjordetkanalen...................................................................................28
5.3.1 Sedimenter.........................................................................................................................28
5.3.2 Vannkvalitet.......................................................................................................................28
5.3.3 Fjærmygg...........................................................................................................................28
5.4 Delområde B – Grängeshallen – Skippergata....................................................................29
5.5 Delområde C – Bratsberg Brygge – Down Town..............................................................29
6. Videre saksgang ................................................................................................................................30
7. Sluttmerkning....................................................................................................................................31
811665/svis 3. september 2008 Side 2 av 31
c:\documents and settings\svis\desktop\811665 rapport 1 down town og porsgrunn sentrum sør ku rev 080903.doc