Agenda - 06-26-1995 - VIII-G - Laserfiche WebLink

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10 Recommendations for Extending and Modifying the Program _ Work The Triangle Area Water Supply Monitoring Project has made significant progress toward its original goals. It has provided a solid basis for measuring long-term changes in water quality,and expanded our information about synthetic organic chemicals in the Triangle Area's water supplies.Much of this data will be of value to local utilities in meeting new monitoring requirements under the Safe Drinking Water Act and in developing strategies for protecting and treating local drinking water supplies. Based on the first five years of monitoring data, sampling frequency may be reduced for major ions,nutrients,and trace metals without losing valuable statistical data The Project Steering Committee,composed of representatives from each participating local government, recommends the following specific changes to the Project: A. Streams: Sample physical properties,major ions and nutrients 6 times per year and trace metals 2 times per year at intake sites and other USGS sites.(years 1,2, 3, and 4). B.j,W=: Sample physical properties,major ions,nutrients, and chlorophyll a 4 times per year and trace metals 2 times per year. (years 1,2, 3,and 4) USGS would reduce major ions and nutrient monitoring at its sites from 12 to 4 times per year. The Committee believes,given the existing Project database, the proposed monitoring frequency and sites for Phase III will maintain statistical validity while freeing up resources for other monitoring. C. 13 DEM Sites.The remaining stream and reservoir sites in the network will be sampled by DEM. DEM will sample 13 sites 12 times per year for nutrients and less frequently for trace metals and major ions. The State's ambient monitoring program is subject to change based on its level of funding. (years 1, 2, 3,and 4) Attachment C.2 is a map of the Triangle Area Water Supply Monitoring Sites. D. Collect and analyze samples once per year at 9 intake sites for selected organics. (years 1, 2, and 3) This expands the number of organic constituents measured at intake areas. E. Sample selected sites (5 sites)2 times each during a storm event for major ions, nutrients, and trace metals. (year 1) During Phase II,the Project conducted special storm event monitoring at 6 sites and monitored one half of the remaining sites once during high flows. In year 1 Phase III,the Project will evaluate sites to determine where it needs additional high flow data. This data will enhance the Project's pollutant loading analysis. F. Discontinue all project monitoring at Falls Lake at Raleigh intake,at NC50,I-85, NC98,Little Lick Creek,Knap of Reeds Creek, Ellerbee Creek, Swift Creek, and at Lake Benson.Discontinue all project monitoring at Jordan Lake at Bells Landing and the Smithfield site on the Neuse River. Raleigh and Smithfield are not participating in Phase III of the Project. G. Develop annual project summaries (year 1, 2, and 3) an interpretive report. (year 4)