department of the environment ground water rule laboratory presentation
TRANSCRIPT
![Page 1: Department of the Environment Ground Water Rule Laboratory Presentation](https://reader036.vdocuments.site/reader036/viewer/2022062718/56649e895503460f94b8e3b6/html5/thumbnails/1.jpg)
Department of the Environment
Ground Water Rule
Laboratory Presentation
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Presentation Overview
• Why the GWR regulations were created.
• General requirements of the GWR.
• Focus on laboratory/ sampling requirements.
• Handouts/ question and answer.
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Why??
• EPA is particularly concerned about ground water systems (GWSs) that are susceptible to fecal contamination because these systems may be at risk of supplying water that contains harmful microbial pathogens
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Purpose of the GWR
• Reduce public health risk associated with fecal contamination for people served by groundwater sources.
– Viruses
– Bacteria
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PWS Requirements Required By:
Notification of 4-log treatment of viruses December 1, 2009
Required Beginning:
Triggered source water monitoring
December 1, 2009
Corrective actions
Compliance monitoring
New sources placed in service must meet triggered source water monitoring requirements or conduct compliance monitoring for 4-log treatment of water
States can require GWSs to conduct assessment source water monitoring
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To Whom Does the GWR Apply
• Systems producing and relying 100% on ground water.
• Consecutive systems receiving ground water.
• Mixed systems using surface and ground water.
– Unless they combine all their ground water with surface water prior to treatment meeting the SWTR.
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Key Provisions of the GWR
1. Sanitary surveys. (MDE)
2. Corrective action. (MDE- Water Systems)1. Significant deficiencies.
2. Fecal contamination.
3. Monitoring. (You- Water Systems)1. Source Water Monitoring. (Triggered or Assessment)
2. Compliance Monitoring.
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Ground Water System
Triggered SourceWater Monitoring
4 Log Treatment and Compliance MonitoringAssessment Source Water Monitoring
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GWR and TCR Relationship
• TCR and the GWR work together.
• TCR positive may indicate a problem with the ground water source.
• So, a TCR positive sample triggers a “Triggered Source Water Sample”
– Exceptions
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Triggered Source Water Sample
• Ground water system must.
– Collect at least 1 raw water sample per TCR positive at each source that was operating when the TCR positive sample was taken.
– Collect the triggered source water sample within 24 hours of being notified of the positive TCR sample.
• Time extension is possible.
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Triggered Source Water Sample
• Must be analyzed for a fecal indicator
1. E. coli
2. Enterococci
3. Coliphage
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Fecal Indicator Methodology Method Name
E. coli Colilert
Colisure
Membrane Filter Method with MI Agar
m-ColiBlue24 Test
E*Colite Test
EC-MUG
NA-MUG
9223 B
9223 B
EPA Method 1604
9221 F
9222 G
Enterococci Multiple Tube Technique
Membrane Filter Technique
Membrane Filter Technique
Enterolert
9230 B
9230 C
EPA Method 1600
Coliphage Two-step Enrichment Presence-Absence Procedure
Single Agar Layer Procedure
EPA Method 1601
EPA Method 1602
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Sampling Location
• Sample at well or state-approved location
• Sample before treatment
• Might be necessary for GWS to install new sample tap
• GWSs with multiple sources may request approval from state to reduce number of locations
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Systems Serving ≤ 1,000 people
• Ground water systems may use a TCR repeat sample to satisfy the GWR triggered source water sample.
– Lab must use an approved E. coli method
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What if the “Initial Triggered Source Water” is Positive
• GWS must take 5 “Repeat Triggered Source Water Samples” within 24 hours of being notified of the positive “Initial Triggered Source Water Sample.”– Unless state has already required corrective action.
• See GWR Monitoring Report Form
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What if any of the “Repeat Triggered Source Water Samples” are Positive
• The Ground Water System must take corrective action.
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Consecutive & Wholesale Systems• Consecutive Systems
– Notify wholesale system(s) of total coliform-positive routine sample taken under the TCR
• Notification required within 24 hours
• Notification must be provided to all wholesale system(s) with ground water source(s) that had provided water to the consecutive system
• Wholesale Systems
– Upon receipt of notification from consecutive system:
• Collect samples from all ground water sources serving the consecutive system within 24 hours of notice
• For any fecal indicator-positive sample, notify all consecutive systems served by that ground water source within 24 hours
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3
2
1
System B Consecutiv
e
WholesaleSystem
TC+
EC+W1 W2
System A Consecutiv
e
System A notifies wholesale GWS of TC-positive sample collected under the TCR.
Wholesale GWS samples ground water sources for fecal indicator.
Wholesale GWS notified of source water fecal indicator-positive result notifies all consecutive GWSs served by source, and undertakes state-approved corrective action(s).
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Representative Monitoring
• States may allow for GWSs with multiple sources
• Allows system to collect triggered source water sample(s) that represent each monitoring site in TCR sample siting plan
• Representative sample locations must be approved by state
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Triggered Source Water Monitoring Plan
• For multi-source systems:
– Identify ground water sources that are representative of each TCR monitoring site
• Each TCR site needs to be associated with at least one source
– May need to submit the plan to the state for approval (if directed by the state)
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low pressure zone
Well 1Well 3
TCX
TCY
TCZ
Well 1 Well 3Well 2
Low Pressure Zone
Mixed Zone
High Pressure Zone
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1800 Washington Boulevard | Baltimore, MD 21230-1718410-537-3000 | TTY Users: 1-800-735-2258
www.mde.state.md.us
Maryland Department of the Environment
Travis E. Sterner, R.S.Water Supply Program
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Interior Pages
• Type.
• Here.