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Consent of copyright owner required for any other use. EPA Export 26-07-2013:12:50:28 For inspection purposes only. Consent of copyright owner required for any other use. EPA Export 26-07-2013:12:50:29 Kerry County Council – Waste Water Discharge Licence Application for Glenbeigh Agglomeration. ___________________________________________________________________________________ Assessment of Impact on receiving Surface or Ground Water Watercourses The Behy River which flows through Glenbeigh rises in the Mullaghnarakill Mountains and flows to Rossbehy Creek. It is not tidal as far upstream as the Behy Bridge however. The Behy River discharges into the Rossbehy Creek which forms part of Dingle Bay. Rossbehy Creek forms part of the Castiemaine Harbour Special Protected Area (SPA), National Heritage Area (NHA) and candidate Special Area of ConservatIon (cSAC). Kerry County Council has water quality data from grab samples taken from the Behy River at three of the five Environment Protection Agency (EPA) water quality monitoring points upstream of the existing waste water treatment plant outfall. One of the monitoring points is located at the Behy Bridge. The Kerry County Council records date between 15th September 1996 and 22r August 2002. The results of the sampling indicate levels of Molybdate Reactive Phosphorus ranging between <0.005 and 0.048mg/I. The most recent EPA data dates back to June 2004. The results of the EPA monitoring programme Indicate that the river has a Q ratIng of 4-5. Aquafact International Limited took four kick samples from the Behy River in spring and summer 2006. Two of the samples were taken upstream of the proposed WWTP outfall and two samples were taken downstream of the proposed WWTP outfall. Assimilative Capacity Receiving waters should have a capacity to assimilate effluent discharges without showing signs of pollution. The receiving water for the proposed Glenbeigh Sewerage Scheme is the Behy River. It is desirable that any effluent discharge to the Behy River should not; • increase the BOD5 level by more than 1mg/I; • increase the overall BOD5 to more than 3mg/I; • increase the Ortho Phosphate level to more than 0.03 mg/I; • increase the Ortho Phosphate level Forby inspection more thanpurposes 0.010mg/I. only. The characteristics of the treatedConsent effluent of copyright cons owneridered required is for as any shown other use. in Table 5.3 combined with a orthophosphate level of 1mg/I and total phosphorus level of 2mg/I. The estimated water quality of the Behy River before and after discharge for a 2016 PE of 3,000 and a 2026 RE of 4,000 has been calculated as shown in Tables below. _____________________________________________________________________ Attachment F.1 EPA Export 26-07-2013:12:50:29 Kerry County Council – Waste Water Discharge Licence Application for Glenbeigh Agglomeration. ___________________________________________________________________________________ Table Behy River Water Quality Before and After Discharge for 2016 PE of 3,000 Parameter Units Treated Behy Behy Effluent River River before after Discharge Discharge PE 3,000 Flow m3/head/day 0.18 Total Flow m3/day 450 95%ile Flow in river m3/day 32,832 33,282 B0D5 mg/I 25 2 2.3 SS mg/I 35 2 2,4 Total Nitrogen mg/I - N 15 0.36 0.6 Nitrate(NO3) mg/I- NO3 25 <0.5 0.83 Nitrite(N02) mg/I- NO2 0.5 <0.25 0.25 Total Phosphorus mg/I - p 2 0.06 0.09 Concentrations Concentrations Ortho Phosphates mg/I 1 0.02 0.033 Non-ionized Ammonia mg/I NH3 0.02 <0.08 0.079 Total BOD g!day 13,500 65,664 79,164 Total SS g/day 18,900 65,664 84,564 TotaL Nitrogen gdpy 8,100 11,820 19,920 Total Nitrate(NO3) q/day 13,500 16,416 29,916 ..Lc! Nitrite (NO2) g/day 270 8,208 8,478 Total Phosphorus g/day 1,080 1,969 3,050 Total Loads Total Loads Ortho Phosphates g/day 540 656 ALI2L.. Non-ionized Amonia g/day 10.8 2,627 2,637 For inspection purposes only. Consent of copyright owner required for any other use. Based on the discharge standards described above and the assimilative capacity of the 95%ile flow in the Behy River we can see that there is a dilution capability of approximately 1:61 for a RE of 3,000 in the river, the increase in the BOO5 level is less than 1 mg/I. However Ortho Phosphate levels are above recommended guidelines. This is after phosphate levels in the treated effluent are reduced to 1mg/I through tertiary treatment. It should be noted that the impact of orthophosphates on water quality is considered to be more accurately assessed using average or median river flows. This is because orthophosphates impact over a long period of time. If the average flow of 164,000 m3/day for the Behy River is used, then the increase in orthophosphates would be less than 0.005mg/I. The Non-ionized Ammonia levels in the Behy River are above the levels required by the 1988 Freshwater Fish Regulations after discharge. Therefore full nitrification of Ammonia and Nitrogen related compounds will be required within the extended aeration plant. This will allow for nitrate, nitrite and ammonia compounds to be converted to Nitrogen gas. _____________________________________________________________________ Attachment F.1 EPA Export 26-07-2013:12:50:29 Kerry County Council – Waste Water Discharge Licence Application for Glenbeigh Agglomeration. ___________________________________________________________________________________ Table Behy River Water Quality Before and After Discharge for 2026 RE of 4,000 Parameter Units Treated Behy Behy Effluent River River before after Discharge Discharge PE 4,000 Flow m3/head/day 0 18 Total Flow m3/day 720 95%ile Flow in river m3/day 32,832 33,552 B0D5 mg/I 25 2 2.5 SS mg/I 35 2 2.7 Total Nitrogen mg/I - N 15 0.36 0.7 Nitrate(NO3) mg/I- NO3 25 <0.5 1.03 Nitrite(N02) mg/I- NO2 0.5 <0.25 0.26 Total Phosphorus mg/I - p 2 0.06 0,1 Concentrations Ortho Phosphates mg/I 1 0.02 0.041 Non-ionized Ammonia mg/I NH3 0.02 <0.08 0.079 Total BOD g!day 18,000 6S664 83,664 Total SS g/day 25,200 65,664 90,864 TotaL Nitrogen gdpy 10,800 11,820 22,620 Total Nitrate(NO3) q/day 18,000 16,416 34,416 ..Lc! Nitrite (NO2) g/day 360 82O8 8,568 Total Loads Total Loads Total Phosphorus g/day 1,440 1970 -- 3,410 Ortho Phosphates g/day 720 657 - 1,377 Non-ionized Amonia g/day 1.4 2,627 2,641 Based on the discharge standards in Table 5.6 and the assimilative capacity of Behy River we can see that there is a dilution capability For inspection of approximately purposes only. 1:46 for a PE of 4,000 in the Behy River. As for the PE for 3,000 theConsent Ortho of copyright Phosphate owner required levels for any are other above use. recommended guidelines. This is after phosphate levels in the treated effluent are reduced to 1mg/I through tertiary treatment. However, if average river flows are considered, then the increase in orthophosphates is less than 0.005mg/I The Non-ionized Ammonia levels in the Behy River are above the levels required by the 1988 Freshwater Fish Regulations after discharge. Therefore full nitrification of Ammonia and Nitrogen related compounds will be required within the extended aeration plant. This will allow for nitrate, nitrite and ammonia compounds to be converted to Nitrogen gas. _____________________________________________________________________ Attachment F.1 EPA Export 26-07-2013:12:50:29 Hydrometric Area 22 (Part) River and Code : BEHY (KERRY) 22/B/02 Tributary of : Sea - Dingle Bay OS Catchment No: 209 OS Grid Ref : V 657 920 Date(s) Surveyed : 10/06/2004 Sampling Stations Biological Quality Ratings (Q Values) No. Location 1990 1994 1996 1998 2001 2004 Coomnacronia Lake Branch 0300 Br W of Ballynakilly Br 4-5 4-5 4 4 4-5 4-5 Coomaglaslaw Branch 0400 First Br d/s Coomaglaslaw L 4 4-5 4 4-5 4-5 4-5 Main Channel 0800 Second Br d/s Coomasaharn L 4 4 - 4 4 4-5 1000 Ballynakilly Br 4-5 4-5 4 4-5 4-5 4-5 1300 Behy Br 4-5 4-5 4-5 4-5 4-5 4-5 Assessment: Continuing satisfactory. Sampling Stations National Grid Ref. Discovery County No. Location X Y Series No. Code 0300 Br W of Ballynakilly Br 64299 87740 83 KY 0400 First Br d/s Coomaglaslaw L 62455 86766 83 KY 0800 Second Br d/s Coomasaharn L 63965 85693 83 KY 1000 Ballynakilly Br 64433 87860 83 KY 1300 Behy Br 66485 90857 78 KY Site Altitude and Upstream Catchment Characteristics For inspection purposes (where only.