Agenda - 12-07-2015 - 6-a - Minutes

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20 1 2 OWN Well Locations and Details (map and graphs) 3 4 OWN Updates 5 ■ Brumley Forest Preserve bedrock well 6 ■ OWN data used to estimate groundwater recharge: 7 o Water Table Fluctuation Method 8 o USGS Groundwater Toolbox also used 9 ■ Public outreach: 10 o All OWN groundwater level data online 11 o Basic information about water in Orange County - in prep 12 o Means of maximizing well yield - in prep 13 o OWN data and groundwater in Orange County— in prep 14 15 BACKGROUND: 16 DEAPR's groundwater observation well network, Orange Well Net (OWN), uses a 17 combination of bedrock and regolith wells spread across the main types of bedrock geology 18 present in Orange County. Regolith wells measure groundwater levels in the unconsolidated 19 material present above bedrock to monitor natural stresses on the quantity of groundwater 20 available in storage caused by variations in climatic conditions. Bedrock wells monitor changes 21 in groundwater levels in the bedrock across the County. 22 Groundwater level data collection is underway at seven bedrock wells and five regolith 23 wells. In early 2015, a bedrock well on Triangle Land Conservancy property was added to the 24 network. Attachment A is a listing of well construction details for the current OWN observation 25 wells. Attachment B is a map showing the locations of the wells that are currently in use along 26 with the underlying geology. 27 All data collected by OWN is available to the public on the NC Division of Water 28 Resources (DWR) web site provided below. The web site includes maps of well locations, 29 geologic information, and statistical curves that provide monthly minimum, mean, and maximum 30 groundwater level information for each well in the network. This information can be used to 31 compare recent groundwater levels with historical values. 32 http://www.ncwater.org Data and Modeling/Ground Water Databases 33 34 Staff plans to begin an outreach campaign on groundwater information for County 35 residents in late 2015-early 2016. Informational outreach materials are being designed that will 36 help residents learn a variety of useful information, from basic hydrologic concepts to measures 37 for planning the installation of supply wells which may help increase the yield of water from 38 these wells (please see Attachments C and D). These documents will be used in combination 39 with data gathered from the OWN network to inform residents of common facts about 40 hydrogeology, especially with regard to groundwater occurrence and usage. 41 42 6. Eno River Hydrilla Management Pilot Study Update 43 Tom Davis reviewed the following information: 44 BACKGROUND: 45 Hydrilla (Hydrilla verticillata) is an invasive aquatic plant native to Asia that was first 46 noted in the United States in the 1960s (Attachment A). Since then, hydrilla has spread rapidly 47 in the U.S., reaching nuisance levels in many locations. Hydrilla has been called "the perfect 48 aquatic plant" because it spreads rapidly, is able to reproduce in four different ways, grows in 49 extremely low light, and is able to crowd out native aquatic vegetation.