Groundwater 101 and Source Water Protection. Tom Pattee Groundwater Coordinator Regional Geologist – OHA DWP. Outline. What is groundwater; how does it work? Well Construction Source Water Assessments Source Water Protection GWUDI & GWR Tie-ins Hands-on Exercise.
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Regional Geologist – OHA DWP
The entire process can be divided in to five parts
- Groundwater originates from precipitation sinking into the ground from the surface
to the water table.
- Groundwater occurs in the open spaces between silt, sand, and gravel particles or
in natural fractures with the bedrock.
High/Local recharge rate
- Groundwater moves from areas of high elevation to areas of low elevation.
- How easily water travels underground is a function of the type of material that it is
- Permeability: gravel > sand> clay
Groundwater fall during the drier summer months.
- Additionally, the greater number of pumping of wells in the summer impacts groundwater
levels of wells through drawdown.
OHA Data Online: http://188.8.131.52/
OWRD Well Log Link
1996 Amendments to the Safe Drinking Water Act
for Public Water Systems (PWS)
OHA and DEQ contact PWS;GPS intake or well and request PWS assistance
Activate community citizens,
gather input, select a few
strategies for protecting
the source area
DELINEATIONof the source area or “Drinking Water Source Area”
INVENTORYfor “Potential Sources of Contamination” per guidance
Source Water ASSESSMENT phase
OPTIONAL: Consider writing a Drinking Water Protection Plan and gaining certification from DEQ
Drinking Water PROTECTION phase
IMPLEMENT the strategies to prevent contamination
SOURCE WATER ASSESSMENT REPORT
Sent to PWS
Groundwater: 948 systems statewide
Surface Water: 142 systems statewide
Each assessment unique to individual water system
Procedures for Delineation: Groundwater systems in existence prior to 1999
Hydrogeologic Mapping systems in existence prior to 1999
Residential & Municipal
Commercial & Industrial
Forestry and Agriculture
Evaluation of sensitive areas within source area
High soil erosion and runoff potential
High permeability soils, and
Aquifer characteristics and ease with which water can move from the surface to the aquifer,
chemical or coliform detections,
Recommendations for how to protect the water quality, but no new requirements
Sensitive Areas (Natural Factors)
Susceptibility of the Drinking Water Source
public awareness – news features, sign installation
incorporate pollution prevention concepts and BMPs for high-risk locations
household hazardous waste education/collection
community/watershed spill response plans
local zoning ordinances
easements in sensitive areas – agriculture/forestry
septic system outreach/maintenance program
technical training for high risk facilities’ employees
County overlay; early notification re: changes
1.3 - Source & Wellhead Protection
Sources identified under GWUDI protocol.
High sensitivity & surface water with 500 feet.
Sources identified under GW Rule protocol.
High sensitivity & fecal contaminant source within 2-yr TOT Zone.
Monthly Assessment Monitoring
Confirmed EC +
Is GWUDI an issue?
Surface Water Treatment
Technical Assistance Groundwater Rule
OHA Drinking Water Program
(541) 726-2587 x 24
DEQ Drinking Water Protection
Drinking Water Protection Bulletins
Management strategies for specific land uses
GIS resourcesProtecting the SourceTechnical Assistance & Information