MSP -001 Marine and Special Projects May 1991. ■ ■ I Ravenglass Harbour Microbiological Survey April 9 1991 1. Introduction N.W.W. are considering options for the long term treatment and disposal of sewage from Seascale. One of the alternatives being considered is to transfer Seascale flows to the existing works at Drigg, which would be extended and secondary treatment provided. The existing Drigg works discharges to the tidal River Irt prior to its flowing into the enclosed Ravenglass Harbour. Ravenglass harbour is used extensively by pleasure craft, and contains a commercially worked shell-fishery. The present survey was carried out to determine the present level of bacterial contamination at Ravenglass. This would give some indication if the continued discharge of sewage {albeit treated) into the Irt is environmentally sound, as well as giving 'base-line' data. 2. Survey details The Hovercraft was used to take a representative grid of samples within Ravenglass Harbour as well the tidal sections of the three rivers which flow into Ravenglass - the Irt,Mite and Esk. The system was covered three times; just after high water, mid- tide and approaching low water. Positions were logged using a G.P.S. navigator, and should be accurate to +/- 30m. The speed of the Hovercraft is such that the samples taken on each run could normally be regarded as synoptic. On the first (high water) run, however, some temporary electrical problems with the hovercraft delayed its completion. Possible sources of bacterial contamination are: -the three non-tidal rivers -septic tank drainage, particularly from Drigg -the primary sewage treatment works at Drigg and Ravenglass local surface water drainage. Samples were taken fromt -from the two sewage works -the non-tidal rivers, simultaneously with the mid-tide run -a surface water drain which outfalls to the Mite just downstream from ENVIRONMENT AGENCY 134043 3. Survey results Samples were taken to NWW Kendal lab for analysis. All samples were analysed for total coliforms and E.coli, with faecal streptococci determined on a sub-set. Although this area is not designated under any E.C. regulations, it seemed appropriate to classify the waters against the bathing water directive, which would indicate the suitability for sailing and contact sports. The classification system is as under* class total coliforms E.coli note /100 ml poor >10,000 >2,000 fails EC limit good 500-10,000 100-2,000 EC mandatory limit excellent < 500 < 100 EC guidline limit There is a guideline value of 100 faecal streps/lOOml. There is no mandatory limit. The survey showed a low level of bacterial contamination throughout the system. Neither Drigg nor Ravenglass treatment works has a major impact on water quality. The Irt at the tidal limit is relatively more polluted than the Esk or the Mite. This is probably a reflection on the drainage from Drigg village. 4. Conclusions 1. There is a low level of bacterial contamination within Ravenglass harbour. 2. Use of the site at Drigg to build a new works to serve Seascale would seem to be worth investigating in more detail. 3. The surface drain to the Mite shows some evidence of bacterial contamination and should be investigated further. Ravenglass Harbour - Field results. 09.April 1991 sample time total coliforms E.coli f. streps. ** * perlOOml*** 1 08. 16 500 30 10 2 08. 19 1200 160 3 08. 23 1900 400 4 08.26 1200 190 5 08. 32 400 190 100 6 10. 04 200 70 7 10. 10 400 190 8 10. 15 200 20 9 10. 20 3000 600* 10 10. 24 1000 1000 40 11 10 . 31 2100 900 40 12 10. 32 1300 140 13 10. 37 1900 140 14 10.41 300 110 15 11.01 1500 110 0 16 11.05 <10 10 17 11. 10 100 <10 18 11.39 500 110 19 11. 46 700 160 20 12. 00 1600 370 10 21 12.05 1000 270 22 12. 10 1400 300 23 12. 18 1700 700 24 12.26 700 70 26 13. 52 600 160 0 27 13. 57 900 70 28 14.00 500 140 29 14. 09 1200 150 30 14. 15 4000 500 31 14.22 1200 180 10 32 14. 27 1100 190 33 14. 30 1400 180 34 14. 37 400 40 35 14.42 500 30 102 12.35 1000 330 (R.Irt) 104 12.00 400 30 (R.Mite) 105 12. 10 <100 <10 (R.Esk) 125 12.30 22000 4000 <100 sample time total coliforms E.coli f. streps. *** perlOOml*** Drigg E.T.W. 100 08.30 2.lxlO7 6x10s 103 12.35 1.4xl07 6x105 Ravenglass E.T.W. 101 08.50 2.2x10* 7 . 0 x 1 0 5 5xlO« 106 12.30 l.OxlO7 2.5x106 SEASCALE CP CUMBRIA COUNTY 12 13 04 06 07 08 V M ill He .Summtr'>*•» y\Moorn<f«/ O / ’tt U -i r n Squir , Cp*er» "W h inn phi II l V _ i Ce»i(t -c. 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