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HomeMy WebLinkAboutAgenda - 10-14-2014 - 31 ORANGE COUNTY BOARD OF COMMISSIONERS ACTION AGENDA ITEM ABSTRACT Meeting Date: October 14, 2014 Action Agenda Item No. 3 SUBJECT: Orange Well Net Update DEPARTMENT: DEAPR PUBLIC HEARING: (Y /N) No ATTACHMENT(S): INFORMATION CONTACT: A) Orange Well Net Well Details Tom Davis, 245 -2510 Table David Stancil, 245 -2510 B) Map of Well Locations C) DWR Web Page Examples PURPOSE: To receive an update regarding Orange Well Net (OWN), the groundwater observation well network. BACKGROUND: The Department of Environment, Agriculture, Parks and Recreation's ( DEAPR) groundwater observation well network, Orange Well Net (OWN) uses a combination of bedrock and regolith wells spread across the main types of bedrock geology present in Orange County. Regolith wells, which measure groundwater levels in the unconsolidated material present above bedrock in the subsurface, monitor natural stresses on the quantity of groundwater available in storage which are caused by variations in climatic conditions. Bedrock wells monitor changes in groundwater levels in the bedrock across the County. Groundwater level data collection began at six bedrock wells in March 2010. Additional bedrock wells and regolith wells have been added over the last few years. Wells have also been removed from the network for various reasons. In July 2014, Capital Investment Plan (CIP) funds were utilized to establish a new regolith well at the Blackwood Farm to provide information regarding shallow groundwater conditions in concert with the existing bedrock well at this location that has been part of OWN since 2010. These funds were also used to complete bedrock and regolith wells in a wooded area at the future Northeast District Park site. Attachment A is a listing of well construction details for the current OWN bedrock and regolith wells. Attachment B is a map showing the locations of the wells that are currently in use along with the underlying geology in Orange County. 1 All data collected by OWN is available to the public on the NC Division of Water Resources (DWR) web site: http: / /www.ncwater.org /Data and Modeling /Ground Water Data bases /leveltable. php ?tl =1 &net = orange &inactive= The DWR web site includes maps of well locations, geologic information, and statistical curves that provide monthly minimum, mean, and maximum groundwater level information for each well in the network. This information can be used to compare recent groundwater levels with historical values. Examples of the information available on the DWR web site are included as Attachment C. FINANCIAL IMPACT: There is no financial impact to the County at this time. RECOMMENDATION(S): The Manager recommends that the Board receive the update on the groundwater observation well network known as Orange Well Net and provide feedback to staff. ATTACHMENT A Orange Well Net Well Details Bedrock Wells Bedrock Well Location Casing Depth, ft. Total Depth, ft. Top of Casing Elevation, ft. Bedrock Geology 1 Andrews Rd. (COL -1) 1 Millhouse Rd 67 164.7 515.22 Epiclastics 2 Eno Confluence Property 37 175.5 609.27 Felsic Tuff 3 Former 911 Center 85 400 Altered Tuff 4 Blackwood Farm 100 302 557.44 Felsic Lavas and Tuffs (Dacite)' s Duke Forest 4D 85 400 427.82 Felsic Plutonics or Intermediate Plutonics- CHECK 6 Eubanks Road 33 145.7 531.15 Mafic Plutonics (Gabbro) Regolith Wells Regolith Well Location Total Depth, ft. Top of Casing Elevation, ft. Bedrock Geology 1 Andrews Rd. (COL -1) 33.0 528.00 Felsic Tuff 2 Hwy 54 (COL -3) 43.7 528.18 Epiclastics 3 Orange Grove Road (COL -4) 35.2 504.86 Epiclastics 4 Blackwood Farm (BFS) 45.0 Felsic Lavas and Tuffs (Dacite)' 5 1 Northeast Park (N ES) 42.0 1 Epiclastics 1 - Main bedrock lithology in the county, by area. O °Creek JATTACH MENT B 4 -- C 20 t~ F Lu m \ P Z m w m y0< 9 �o �c8sk mp0 RO oy \m O \y Q m� fii Gy'l RD e --- S KIGER RD West" ork of < 'sq no River Reservoir ake Orange Northeast o �O Park G�,a no Confluence Oc�'40 0 � i A R Ca PER CLUB IQp LEBANON Y O LEBA Lake Michael ¢ y 70 w Y Corporation O Lake (A3 US 70 W c �o p° WE T TE D i o 4'�2 D PN 9�m o o u 6 P yG0 �' S 70•A Q 0 0.5 1 2 Miles a�0 O 0o "'0 x G Ug W l i i i l i i i l a�O�G RO 4my -iit Ceeµ 10 � � c o� Blackwood Farm o Blackwood Fa r Former 911 Center , s m V New Cr D Legend P c® Y RR Orange Well Net wells ART UR lW&N, RD � • Bedrock wells ° 8 / ^ Af 6 Duke Regolith wells c ' /7oQ Fo'rere st 4D Other Features y� Mill house O -� DWO REP Duke Forest Wells O CO ° Eubanks - USGS stream gages 0 02 Z y 0 °4 / Roads Cane Creeks a 00 i NOM - Major streams Sp Reservoir -Reservoirs and lakes D J O �' ® Non -county parkland & open space COL -1 r ®County parkland &open space e Gfo i COL-4 L -3 CO 54W � � Generalized Bedrock Geology Units WY 1. Altered tufts Phis Npyys PP - 2. Epiclastic rocks `¢y c as 3. Felsic tuff 4. Felsic lavas & tuffs ° University Lake a - 5. Mafic lavas & tuffs OLD GREENSBORO R A o ^ 6. Felsic plutonic (intrusive) rocks Creep " 140 lie 0� e � e F - 7. Intermediate plutonic (intrusive) rocks Z/ �� 3 tj - 8. Mafic plutonic (intrusive) rocks" w° - Diabase m Other 3 � Triassic sedimentary rocks Dept. of Environment, Agriculture, Parks and Recreation Land Records GIS Division 8/28/2014 <OC 220K OAgishome \gisproj \land_ resource \Generalized_OC_Geology. mxd ATTACHMENT C WDENREmployee Sign In NC Department of Environment and Natural Resources - Water Resources • Home • Contacts & Staff Listing • Public Water Supply • Water Planning • Water Quality Permitting • Water Qualfty Regional Operations • Water Sciences Search DWR... l Ground Water Level Database Access Orange County Monitoring Well Database 11 Wells return to water level access page 1611 Mail Service Center • Raleigh, NC 27699 -1611 Phone: (919) 707 -9000 • Fax: (919) 733 -3558 Comments, questions, or problems? Please contact the DWR Webmaster C 2014 Division of Water Resources • NC DENR • NC.gov Gw Download text file County Id Name Aquifer pth De Orange G 45F1 Eno Confluence Property Felsic Tuff 192 Orange H 44P1 Blackwood Farm Felsic lavas and tuffs (Dacite) �� 302 Orange H 44P2 911 Center Altered Tuff I 400 Orange I 44B 1 DF -41) Felsic plutonics 397 Orange I 44F 1 Millhouse Road Epiclastics 166 !Orange 1 45G I Rocky Ridge Felsic lavas and tuffs (Dacite) 560 Orange I 45J1 Eubanks Road Mafic plutonics (Gabbro) 141 Orange 146RI COL -1 Felsic metavolcanic 30 Orange I 46R2 COL -3 Felsic metavolcanic 41 Orange I 46W 1 COL -4 Felsic metavolcanic 32 Orange J 45J1 Ray Road Felsic plutonics - East Farrington Granite' 237 11 Wells return to water level access page 1611 Mail Service Center • Raleigh, NC 27699 -1611 Phone: (919) 707 -9000 • Fax: (919) 733 -3558 Comments, questions, or problems? Please contact the DWR Webmaster C 2014 Division of Water Resources • NC DENR • NC.gov Gw NCDENREmployee Sign In NC Department of Environment and Natural Resources - Water Resources • Home • Contacts & Staff Listine • Public Water Supply • Water Plannine • Water Quality Permitting • Water Quality Regional Operations • Water Sciences Search DWR... U Ground Water Level Database Detail Field Data Orange County Monitoring Database Detail for H 44P1 Show Map -- Monthly Statistics Plot County Orange H 44P1 water levels 5 Quad H 44P1 _44 Name Blackwood Farm 542 Latitude 36.018709 540 Longitude - 79.080016 a Aquifer Felsic lavas and tuffs (Dacite) 1� c 538 Land Surface NED elevation = 555.30 feet 556.00 °- 536 _.. Measuring Point 1.00 w w (feet above land surfacee) ) E 534 Depth 302.00 532 Casing Depth �L 100.00 -- 530 Generalized Rock Unit ]F 4 01110 07110 01111 07/11 01/12 07112 01113 07113 01114 07114 Number of Water Levels 1 582 69-04 -2014 MC -DWR {date * feet below land surface * ** 999.99 feet below land surface 'i9vater levels from 10 -01 -2013 to 12-31-2014 elevation) value indicates dry well 544 03/26/210 to 07/01/2014 -222.22 feet above land surface value indicates a flowing well 543 - - - - - - - = - - - - - - Output file is tab - delimited text 542 ..... .... .. ... ... .. ...... .. ... . ... ............ ... NED = National Elevation Da[asct, 1/3 arc second value '. ( -10 X 10 meter grid) 541 ti- - -- --- -- - --- — — - .... -....- _. return to well table " 540 - - - - - - -__... . -. .. 0 539 W 538 - - - - - -- -- - - - -- - .. 537 -------- - -- - - -- - -- 636 _... - i 535 110113 010114 030114 050114 070114 090114 110114 waterlevels slope: +9.01 feet /year over this date range start Date: 10 -01 -2013 End Date: 12 -31 -2014 FReplot Hover over or click start and end date fields to change date range. NC.DENREmplo, eY a Sign In NC Department of Environment and Natural Resources - Water Resources • Home • Contacts & Staff Listin¢ • Public Water Sunnly • Water Plannine • Water Quality Permitting • Water Qualijy Regional Operations • Water Sciences Search DWR... Well Location Map H44P1 1611 Mail Service Center • Raleigh, NC 27699 -1611 Phone: (919) 707-9000 • Fax: (919) 733-3558 Comments, questions, or problems? Please contact the DWR Webmaster 0 2014 Division of Water Resources • NC DENR • NC.gov 7 Legend: * Point of Interest 5 ; J 1 Minute Quads County Boundaries ® National Map Topo & Imagery Set Map Buffer: 1000 • meters 0 200 400 600 m Show Maoauest May Show Goottle Mao Show Ground Water Maoserver HC.DEHREmployee Sign In NC Department of Environment and Natural Resources - Water Resources • Home • Contacts & Staff Listing • Public Water Supply • Water Planning • Water Quality Permitting • Water Quality Regional Operations • Water Sciences Search DWR... FEE Ground Water Level Monthly Statistics 544.00 542.00 540.00 t 538.00 536.00 w 534.00 532.00 Blackwood Farm, 'Year: 2014, Statistics Thru: 2013 V%Q 1 j WE 1 -12.00 k u�me�rsm� 530.00 ' 1 ' 1 1 1 1 1 1 1 1 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov -14.00 2Y -16.00 2} -18.00 CU c -20.00 -22.00-- a m d -24.00 -26.00 Dec Jan Month Well: H 44P1 -- Blackwood Farm Statistical curves are monthly minimum, mean, & maximum of the record through 2013. Red points are 2014, latest date in month data. Statistics based on all DWR and USGS data for well. Choose Plot Type: ® Min - Mean -Max Percentile Distribution DMAC Percentile Distribution Select Year of Interest (red points): 2014 T Select the last year for statistical curves: 2013 • Plot will redraw with each selection change. [�] Above monthly maximum ® Above 50th Percentile Below 50th Percentile ❑ Below Monthly Minimum —0 Year of Interest Levels A distinctive feature of this plot is the drop in ground water levels associated with April - May - June (and sometimes longer) time period. This is when evapo- transpiration typically exceeds rainfall which leads to less recharge and a decline in ground water levels. Recovery of ground water levels usually begins in October - November (and sometimes later) when precipitation begins to exceed evapo - transpiration.