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

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8 Attachment B Recommendations for Extending and Modifying the Program _ Workillan#1 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. This change in sampling frequency will allow the Project to expand the number of constituents monitored at intake areas and to focus on those constituents EPA has designated as most important(or of most concern)in drinking water.It will also provide the needed flexibility to address emerging issues, such as cryptosporidium, and to enhance the Project's pollutant loading analysis through continued storm event monitoring and the addition of a stream flow gauge. 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, and4). B. Lakes: Sample physical properties,major ions,nutrients,and chlorophyll a 5 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 6 times per year. This "rotational approach"allows the Project to focus more resources on EPA's Phase II and Phase V(Safe Drinking Water)regulated constituents at intake areas.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 and reducing the City of Raleigh's project cost. 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.1 is a map of the Triangle Area Water Supply Monitoring Sites. D. Collect samples for analysis of cryptosporidium and giardia once per year at 10 intake sites and 10 selected tributary sites. (years 1,2, and 3) There has been increasing awareness and concern about the potential of future outbreaks and increasing likelihood of EPA regulation. The Phase III monitoring of cryptosporidium and giardia would continue the work begun in FY94-95.