River Boyne Water Quality Management Plan - EPA

River Boyne Wntcr Qualify hlmnagcmml PlanCIndy River; a D.O. concentration of 3mg/l 02 was recorded in the earlv morrii~ig of 22ndJuly, 1989 upstream of the Clady conj'uence with the River Boyne. This is a veryzrnsatisfactory level. Recent data shows o~igoing critical values, 3.5 mng/l 02 in July. 1995and 4.6 mg/l in Septeniber, 1994River Devlin; median dissolved oxygen levels measured in this river exceed the minitnumrequirenients at all stations. However, low individual values have been recorded with arange of 31% to 145% saturationStonyford River; Minimum D.O. values on the Stonyford River are 2.3 mng/l (Nov.1993) atClogherbrook, 4.2 mgll at Earls Bridge, 1.5 mg/l at Rathkenna, 2.6 rng/l at Shanco Bridgeand 2.4 mg/l at Stononyfrd Bridge all on the same date, with gerieral evidence of organicpollution. Otherwise, the D.O. data is reasonably satisfactoryMnttock River; dissolved oxygen levels at nionitoring sites on this river exceeded 6tng/I 02.However, a supersaturation value of 154% saturation was recorded in Jzrly, 1991, indicatingthe effects of substantialphotos~hesis. Recent data has been generally satisfactaryMoynalty River; values in the Mo.vnalry River for early morning conditions in July, 1990showed a range of 39% to 68% satzrration. Spot value@f approxirnately 10% saturationhave been recorded locaNy in this river system. Receap'data in Appendix 3 show niinimumvalues of 6.3 ing/l at Bloo~nsbury Bridge, 4.4 tn@i,+&~ahonstown, 5.4 tngl ot SharconianHoiise and very low values (1,2.9,3.2,3..8 mg!@'p Rathbozrrnes Bridge. These rrsrrlls show\occasional severe deficiency cotnpared ~ritIx~'h8;Zninimum staridardr~Vndreegeel Stream (Pnrk River); seep have iridicated a range of voh~es Ji.olll 40% to-\. 0190% satz~ratio~~ 011 this river, i~idishl& of occasiarial severeproblei~is';t.;"5.River Blackwnter (Kells); ~~rry&~resztlts on this river in 1990 and 1991 generally showed arange front 60% to 95% S$$'b~ian, which is salisfactory. However, values iess than 6mg/l02 have been recorded bc a number of stations, particularly upstreatn in the catchment.Recent data shows the majority of results to be satisfactotyfor the downstream section but therange of data includes occasional exmine val~tes from less #ban 6 to 16 mg/l 02, Upstrea~~i,in Co. Cavan, water quality is poor with severe organic pollution indicated by high BOD,anirnonia andphosphate levels and low D.O. levelsFor inspection purposes only.Consent of copyright owner required for any other use.EPA Export 26-07-2013:17:27:01