HomeMy WebLinkAboutAgenda - 12-01-1998 - 10a1
ORANGE COUNTY
BOARD OF COMMISSIONERS
AGENDA ITEM ABSTRACT
Meeting Date: December 1, 1998
Action Agenda
Item # 0_a,
SUBJECT:
REPORT: STATUS OF GROUND WATER RESOURCE INVESTIGATION
DEPARTMENT: PLANNING YUI3LIC HEARING: _ Yes X No
BUDGET AMENDMENT~REQUlIZED: Yes a No
ATTACHMENT(S):
INFORMATION CONTACT:
David Stancil, Ext 2590
• Resource Investigation Scope of Work Paul Thames, Ext 2303
TELEPHONE NUMBERS:
Hillsborough - 732-8181
Durham - 688-7331
Mebane - 227-2031
Chapel Hill - 967-9251
PURPOSE: To receive a status reportfrom the Water Resources Committee and U.S.
Geological Survey on Phase II of the Ground Water Resource Investigation.
BACKGROUND: In July, 1997, the County entered into a cooperative cost-share project with the
U.S. Geological Survey for Phase II of a Ground Water Resource. Investigation.
This project builds on the information produced in Phase I of the Resource
Investigation, which was also a cooperative venture with the USGS to study
ground water recharge rates by watershed. The Phase I report was presented to the
Board in November, 1996. The Water Resources Committee has reviewed work
to date and serves as the review advisory board.
Phase II of the resource investigation involves extensive research into both ground
water availability, use and quality. The project, a 50-50 cost-share with USGS,
builds on information about recharge rates to the ground water system that will
"enable the County to learn more about the area's carrying capacity and...identify
potential water quality problems." The project involves sampling of wells across
the County for yield and quality, analysis of the total amount of ground water
available for use, possible wellhead protection procedures specific to the County's
2
hydrogeology, and eventually alternative planning and management strategies for
future consideration.
The project is scheduled to be completed in June, 2000. When the scope of work
was adopted, an interim report to the Board at the halfway point was planned to
provide an update on project activities to date.
Representatives from USGS and the Water Resources Committee will be present
to provide a multimedia/GIS presentation on information gathered to date.
RECOMMENDATION: Receive as information.
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14
Foi3oa-~ appto~-al gad ftmdin~ the smdp grill be ooaducssd over a 36•moath period. Pot
bu~- coodudaatiam. it is proposed tbat the 1VO~i[ be c~omducted dozing the period fcoaa Jtdy
1.1997 3umre 30: 7AOR Wady tasks will pzocoed ~ foIIows:
Month O Z 4 5 8 IO 12 14 15 18 20 2Z 24 26 Z8 30 32 34 36
Tasl<
1. I.ioe~atart and lots
base ------
2. Caduct well
i
3. nv~ozy
Ca~t~Iie and
~
~
7
data
4. Prcpeee brae »~
5. t3tspttical autpat of z~
of hydeo8eoiopc saalyaa
is 5~ua. tablts. sad maps
6. Cagapa'3e a+railab~k
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7. Doliact water sAmples fag
naa- aad~aes
8. ldmdify and mvealocY poeeadal
so~uoes a~at+o~md-~r~,c
~mrsticm
9. C1 ootput of rzsnlts
of water-guatity aoal7aes
sad she inva~toties
l0. Arepeza<lpt odhVRRI
11. Rcviear and apprroval
p~
12. Preperadlan and
cdWRRi:epott ------------
13. Feline G15t cove:~es
of ~P pzaduct:
14 C1LS oovesa8es m
~~
1S. Iioid meetit~s vrlth Co+mty staff
m ssssst with dav~topmeaz of
16. Ooadact taiimiog sessions on wellbced .---~---w
capdte+e aRa delinamoa, if noq
12
15
Y'BRSONI~II.:
Analyti: order ~d p~rodvetion of the 8aa1 npvtt.viA be paibemed by pes~onod cflhe U.S.
Geoio~ical Snrray. Naeth ins Di~iet. tiaiei~. Noet6 Caca>im~
Sydeo~ie Sa~'ia Uait
H~roiopst CS 1?!13 (Ptvject ~ 7396 time (fos fast 7A m~a~oths)
7096 time ((fiot hnt 12 months)
~dnaio~t t3S 11112 (~ci atalrst. 0315) 2396 time (far I8 mmths)
H~oiopc techoiden cs S~bl7 5096 time (!sa ?+4 moatLs)
PubliaRions unit
Drattsmaa 3096 time {rar 3 amnthe)
E~oooe 2S9L time trot 3 atootht)
Typist 2396 time (four 3 mooshs)
~~~
16
Aaaooorl
Vebicle~
C2r~a1 analyses
Mya ioas
~~
Ntrt~ts
s'Tl~c acns~ns
Anebioaeipeaticycb
8ma~mo.saq-13ts and stasrdan4
Haociliog aad s6ippdns to lab
Total
1;U1~TDIIVG:
~~
U.S. Cleelo6ical Stcrvny
Yer 1 Year 2 Yar 3
(7J97-6195) (7198-6x99) (7/992000)
1132,350 14b,06O 732,670
s z,16o 720 720
S 900 3,590 980
5 Z,Z60 4,530 Z,Z6O
s 12.ZZO
s 1,.8'70
5 4030
s 3,890
s 4so
5 3:060
5 890
s sao
s 9,730
5 3~no
s 630 630 630
5147.3'70 5181.910 3130,230
Yar 1 Yzar T Year 3
(7197.6198) (7/98-d99) fi7/99~~6~200O)
5 T3.683 S 90955 5 75,115
S 73.683 S 90.933 5 75.113
14
17
P~xso~atiei
~V~avatlabf8ty ~baae
wa~eFgadicy pbue
she.
w.~er wnplioe
T~avd
Waoec~availahiltity phase
'W~a~ga~lity p~hssc
vehicle
w~dlabitit~r P~
wcy p~sc
clreamlat soalpses
~~
>~
~~
rrieieod
BTEX smog
lkabioiderpe~icede tceeaiag
10n and st~edacds
How and ~Sppmg tc Lb
~~
Total
FUNUII~iCi:
~ cook
vs. Gsoio8ical ~
Year 1 Year 2 Yea 3
f 7197'~l'98) C7/~-S-b~99') (7199-6~?A00)
S 132.350 138.1$0 132„670
s T.BSo
s 7m 720 720
T 1.4+f0
Z 960 1.180 980
s x.710
s 2,260 2.740 2,260
s l.alo
s 1Z,Z20
s 1.8'10
s 4.030
5 3,890
S .450
t 3.060
s $,~,
s soo
S 9.730
s 3~A0
s 630 690 630
5147,370 5181,910 SIS0,230~
Year 1 Yeat 2 Year 3
(7197-bf98) (7198.6199) (7199-6rZ000)
z 73.685 s 90.955 S 7x,115
s 73.BSS 590.955 S 75.113
14
TOTAL P. 16
Investigation of Ground-
Water Availability and
Quality in Orange County
~~.~ 1
Mid-Project Update to
Orange County Board of Commissioners
U.S. Geological Survey
November 17, 1998
Project Objectives
Availabili
1 Estimate available
ground water
1 Evaluate well yields
1 Estimate ground water
use
1 Delineate contributing
areas to wells
Water Quality
1 Characterize chemical
quality of ground water
1 Determine susceptibility
to contamination
Management
1 Identify planning and
management strategies
~~
1
Estimate Available Ground Water
.~-
1 Ground-water recharge rates determined in
12 watersheds throughout County
1 Daniel, C.C., 1996, Ground-water recharge to
the regolith-fractured crystalline rock aquifer
system, Orange County, North Carolina:
U.S. Geological Survey Water-Resources
Investigations Report 96-4220, 59 p.
1 Presented to Board (December 1996)
~USGS
_y
Evaluate Well Yields
Analysis of data from more than 700 wells
Steps Completed
1 Statistical approach
1 yield distribution and
probability
In Progress
1 Field approach
1 surface geophysics at
high yield wells
1 Mapping approach
1 landform, structure,
and fracture analysis
2
Characterize Ground Water
Quality
Steps Completed Analyte List
1 Solicited participation 1 Field parameters
1 "Stratified Random" 1 Common ions
well coverage 1 Trace metals
1 Nutrients
In Pro4ress 1 Radon
1 BTDC
1 Compile historic data 1 pesticides
1 Sample 50 wells
llSGS
Second Half of Project
1 Complete evaluation of well yields
1 Complete chemical characterization
1 Complete analysis of ground water use
1 Provide training for wellhead protection
areas
1 Identify planning and management
strategies
3
Aquifer .Susceptibility
1 GIS-based approach
1 Generate "Layers" of
data
1 Incorporate into
ARCVIEW
1 Portable application
1 Overlaid data layers
provide quick, general
site characterization
Proiect "Lavers"
1 Land use/land cover
1 Roads, streams, political boundaries
1 Soil type
1 Land slope
t Average vertical conductance
1 Permitted U57's
1 Permitted Public Water Suppy wells
1 Uncontrolled hazardous waste sites
1 RCRA sites
1 Alive landfills
A/so induded.•
1 Well yield
1 Hydrogeologic units
1 Domestic and commercial/industrial water
suppy wells
~Ja7r
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4