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

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.Literature review of Porirua Harbour and catchmentAppendix 2: Annotated Bibliography2 upstream 'suitable'. POTirua Stream all sites 'doubtful', except Takapu Stream site'suitable'. Fancal conforms are high at all'doubtful' sites.Berry, A. (1998b). Annuallyeshwoier qwufity I'epori. WeSIern Wellingtoll Region. 1997/98Resource Investigations Department, Welling10n Regional Council, Publication N" WRC/RINV-G-98115.Annual water quality survey results of streams and rivers in the Wellington Region asinitiated in Cameron (1988). Similar to Berry (1996a) exceptthe Water Quality Index isdropped and water quality is no longer mapped. Measured 2 sites along the POTiruaStream and I each along HOTokiri and Pauatahanui Streams. Faecal conforms still high,but worse in Forirua Stream.Cameron, D. (1988). Baseline worer quufrty of rivers und SII'eoins 11/1he Welling ton Region 1987-88. Wellington Regional Council and Regional Water Board, Water Resources Technical Report88-IBaseline water quality survey results of streams and rivers in the Wellington RegionThe parameters measured were temperature, dissolved oxygen, conductivity, turbidity,pH, faecal conforms and 5-day biochemical oxygen demand. Data obtained is used tocalculate and map a Water Quality Index, based on the "New Zealand Water Quality'General Use' Index" (Smith 1987) which ranks sites in reference 10 general use as"eminently suitable"; "suitable"; "doubtful"; "unsuitable" and "totally unsuitable". Datapresented on the Macroinvertebrate Community Index (Starck 1985), which ranks sitesaccording to fauna diversity and taxa susceptibility to pollution. Presents rankings asmaps and gives appendix of raw data. Mapsinclude general maps of land use. Measured8 sites along the HOTokiri Stream, 6 along the Pauatahanui Stream and 8 along POTiruaStream. HOTokiri Stream 'suitable' along whole length, Pauatahanui Stream 'totallyunsuitable' upstream gradually improving to 'suitable' downstream, but becoming'doubtful' at the mouth. POTirua Stream doubtful' at upper and lower sites and 'suitable'at middle sites. High faecal conform counts appear to cause the low rankings of thesestreams.Cameron, D. (1991). Baseline warer quality of rivers und sirednis ill 1/1e Well^}1810/1 Region 1990-91. Consents and Investigations, Wellington Regional Council, Technical Report 91-2Annual water quality survey results of streams and rivers in the Wellington Region asinitiated in Cameron (1988). Similar to Cameron and Sand0 (1990) but also measuresnitrate and dissolved reactive phosphorus. Also identifies problem areas in theWellington area. HOTokiri Stream last six months of study, deterioration of upstreamsites, 5 'doubtful'. Panatahanui Stream improved water quality due to closure of piggeryon the Haywards Hillbranch, 4 upstream sites have improved from 'doubtful' to 'suitable'POTirua Stream improvement 2 sites now 'suitable', occasional industrial spills recorded.Compared with 87188 data, faecal conform counts have dropped on allstreamsCameron, D. (1993). Basel^ê water quality offlyei's and siredIlls in Ihe Wellingtoll Region1992/93. Consents and Investigations, Wellington Regional Council, Publication N"' WRC/CUT-93134Annual water quality survey results of streams and rivers in the Wellington Region asinitiated in Cameron (1988). Similar to Cameron and Wall(1992). HOTokiri Stream 3sites dropped from 'suitable' to 'doubtful'. Pauatahanui Stream 4 sites dropped todoubtful'; rest are 'suitable'. POTirua Stream ranked in the bottom 10 streams for theWellington area, with allsites 'doubtful'. Takapu Stream and POTirua Stream identified asareas with high concentrations of nutrients, likely to cause nuisance algal growths.Reportfor Porirua City Council & Wellington City CouncilBlaschke and Rutherford Environmental ConsultantsFebruary 201016
,Literature review of Porirua Harbour and catchmentAppendix 2: Annotated BibliographyNutrients in Takapu Stream sourced from farm runoff, in Porirua Stream from urbanstormwater or possibly sewer leaks. Macroinvertebrate Community Index in declinesince 1987Cameron, D. (1994). Baseline warer qwal^b, of Rivers and siredIlls ill Ihe Well^^8101? Region -1993/1994. Consents and Investigations, Wellington Regional Council, Publication N' WRC/Cl-1-94124Annual water quality survey results of streams and rivers in the Wellington Region asinitiated with Cameron (1988). Similar to Cameron and Wall(1992). Measured 4 sitesalong the HOTokiri Stream, 4 along the Pauatahanui Stream and 5 along POTirua Stream.HOTokiri Stream allsites 'suitable'. Pauatahanui Stream 3 sites 'doubtful', I 'suitable'Porirua Stream 4 sites doubtful' and the Takapu Stream site improved to suitable.Porirua Stream identified as an area with high concentrations of phosphorus, sourcedfrom urban stormwater. Lists macroinvertebrates foundCameron, D. and Sand0 (1990). Boseliite water quality of rivers rind sirenins in Ihe WellÎ^gionRegion 1988-89. Water Resources Department, Wellington Regional Council, Technical Report90-I.Annual water quality survey results of streams and rivers in the Wellington Region asinitiated with Cameron (1988), and is a similar study except with no map of general landuseSite locations changed since Cameron (1988) study. Measured 8 sites along theHOTokiri Stream, 6 along the Pauatahanui Stream and 7 along POTirua Stream. HorokiriStream occasional unsightly brown coating of diatoms and filamentous algae, 'suitable'along length except one site which is 'doubtful'. Change probably due to increased BODcaused by algae. Pauatahanui Stream high faecal conforms due to disposal of piggeryeffluent on the Haywards Hill branch, a recently completed oxidation pond system shouldremedy this, all sites doubtful'. POTirua Stream all sites 'doubtful', occasional industrialspills recorded. Compared with 87188 data, faecal conform counts have significantlyincreased on all streamsCameron, D. and R. Wall(1992). BaselÎle woier quality of rivers und sireniiis ill Ihe WellÎ^8101iRegion 1991 -92. Consents and Investigations, Welling10n Regional Council, WRC/Cl-T-92122Annual water quality survey results of streams and rivers in the Wellington Region asinitiated in Cameron (1988). Similar to Cameron (1991) but compares data fromprevious years and presents analysis and discussion of dissolved reactive phosphorus andnitrate-nitrogen. Horokiri Stream all sites returned to 'suitable'. Pauatahanui Streamimproved, all but I site ('doubtful') are 'suitable'. POTirua Stream improvement 5upstream sites 'suitable and 2 downstream doubtful'. Takapu Stream identified as an areawith high concentrations of nutrients from farm runoff, likely to cause nuisance algalgrowths. Compared with 90191 data, faecal conform counts have dropped onPauatahanui and Horokiri Streams. pH in POTirua has dropped from the basic to normalrange.Kerinedy, P. and I. Gadd (2006). Urban stormwaier quality in the Greater Wellington Region:is itthe same as elsewhere? Kingett Mitchell Ltd. prepared for the Greater Wellington RegionalCouncilElevated concentrations of metals (copper, lead and zinc) near Semple St drain, draininginto the Onepoto arm of POTirua Harbour.Reportfor Porirua City Council & Wellington City CouncilBlaschke and Rutherford Environmental ConsultantsFebruary 201017
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TGPC: Greater Wellington letter to Chair, PCTG BOI - Attachment 2

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