TGPC: Greater Wellington letter to Chair, PCTG BOI - Attachment 2

Literature review of Porirua Harbour and catchmentAppendix 2: Annotated Bibliographyabove the value that is deleterious to aquatic life. Most of the DDT is found as thebreakdown product DDD indicating an aerobically weathered source, e. g. agriculturalsoilsMime, J. R. (2006a). Conioi, jinunis in shell/is/Ilesh. Alt lilyesiigu!jolt into rillcrohio/ und Iruce171eiul coinuntinanis in shellfish from seiecied localjolts ill Ihe Wellingion region. EnvironmentalMonitoring and Investigations, Greater Wellington Regional CouncilAssessment of microbiological and trace metal contaminants in filter feeding edibleshellfish (Iuatua, cockles and blue mussels) from the Wellington Region. Concentrationswere compared with edible tissue guidelines, where they exist. Monitored cockle(AUSi, 'ovenus SIMichbwiyi) from five sites in POTirua Harbour (both arms). Faecalconforms were detected in four samples, but were not above guideline limits. No otherlocation tested had faecal conforms above the detection 11nxit. Metals were present butwere not above health standards.Milne, JR. ; Sorensen, PC. ; Keny, S. 2009. Ponyuu HUI. hour subiidolsedinien! qualitymonitoring. Reruns/roi?11he 2008/09 survey. Greater Wellington Regional Council, PublicationNo. GW/EMI-T-09/137.Presents the results of the third survey of sediment quality and benthic communityhealth undertaken at five subtidal sites in the POTirua Harbour in November 2008 (seeWilliamson et a1. 2005; Stephenson & Mills 2006). The sediment chemistry componentwas restricted to assessments of sediment particle size, total organic carbon and heavymetals. Concentrations of total copper, lead and zinc are above 'early warning' sedimentquality guidelines in the subtidal sediments of the Onepoto Arm of Portrua HarbourConcentrations of the other metals analysed are currently below guideline levels in theOnepoto Arm, as are the concentrations of all metals in the subtidal sediments of thePauatahanui Arm. Results taken together with stormwater quality and stream monitoringdata from the surrounding catchment, and interndal sediment quality data, clearlyindicate that urban stormwater is the principal agent in the transport of the majority of thecontaminants to the seabed of the POTirua Harbour, particularly to Onepoto Arm. Sixtyfourspecies of benthic fauna were identified, with a much higher diversity from sites inthe Pauaiahanui Arm. Fauna were composed predominantly of polychaetes, crustaceansand bivalve and gastropod molluscsEffects of metal contamination on benthic fauna composition cannot currently beseparated from the effects of differences in sediment texture and organic carbon contentiris stintoo early to tell whether trends in heavy metal contaminants are environmentallysignificant and whether they will continue into the futureRogers, K. M. (2009). Using stable isotopes to detect land use change and nitrogen sources inaquatic systems. Unpublished Ms. GNS Science, National Isotope CentreUses stable carbon and nitrogen isotope analysis to identify sources of some types ofpollutants into Pauatahanui Inlet. Sediments derived from soils under different land useshave different isotopic signatures, showing, for example, that farming areas and recentlyurbanised areas are more likely to deliver sediment to the Pauatahanuilnletthan the olderurbanised areas. Isotope ratios in estuarine biota can also be used as indicators ofpollution effects and nutrientinputReportfor Porirua City Council & Wellington City CouncilBlaschke and Rutherford Environmental ConsultantsFebruary 20.035