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Attachment 2 i UNRBA Forum Questions and Answers kintba � Question 5-How long will it take to complete the effort on water quality modeling, and what are I some of the example scenarios that will be evaluated? • The UNRBA Watershed and Lake Models are scheduled to be completed by 2022. The models will allow evaluation of many different scenarios, but realistically, we want to focus E on the lake's response to different levels of nutrient management in the watershed. We also want to understand how things that we cannot control, like very large storm events, affect nutrient loading and the growth of algae in the lake. We can test scenarios like best available technologies, and we can also test extreme conditions like if the watershed was completely undeveloped. Primarily we will evaluate the response of the lake to varying levels of investment resulting in non-point and point source reductions. Question 6-Is the State providing any resources to the UNRBA in working on these issues? What can our legislators do to support this effort? • The UNRBA worked cooperatively with DWR to provide some additional data from within the lake. DWR's data is the main source of lake quality and represents the measurements we will be using in calibration and confirmation of the lake models. • DWR is fully engaged with the efforts of the UNRBA. DWR is consistently present at our committee meetings and Board meetings. DWR has also helped the UNRBA secure funding grants like the development of new nutrient reduction credits for practices including the elimination of illicit discharges and soil improvement. Currently DWR is working with the UNRBA to obtain a grant to fund revisions to the watershed model code for nutrient loading from different types of onsite wastewater treatment systems. • The NC General Assembly supported a Session Law to assist with revising the compliance schedule for Stage I and delayed the implementation of Stage II prior to the revision of the Falls Lake Rules. DWR delayed requirements for compliance with parts of the Falls Lake Nutrient Management Strategy to coincide with the Session Law. Question 7-It seems that the UNRBA is making good progress on the re-examination, is there any problem with the Raleigh water supply? • The majority of the drinking water in Raleigh comes from Falls Lake and is treated at the E.M.Johnson Water Treatment Plant. Falls Lake provides raw water that results in a public drinking water supply that meets State and Federal water quality rules. The City of Raleigh provides both annual and monthly drinking water quality reports. Laboratory staff from the City of Raleigh perform an exceptional level of testing to ensure the safety of drinking water. In 2018, staff at the Raleigh laboratory collected, tested and analyzed Raleigh's water between 6,000 and 7,000 times a month. • Seasonal taste and odor issues that sometimes occur are consistent with other reservoirs and surface water supplies throughout NC. Falls Lake meets its designated drinking water use, and Raleigh is in compliance with all national Primary Drinking Water Regulations. Question 8-What is the real problem? Is water quality in the lake bad? Is it getting worse? Is there an algae problem or is the problem with our water quality assessment tools? • Falls Lake was placed on NC's impaired waters list (Section 303(d) under the Federal Clean Water Act)for non-attainment of the water quality standard for chlorophyll-a. This standard requires that chlorophyll-a not exceed 40 pg/I. 2 t la 3 J 1