Transcript 1998 303(d) and 305(b) WATER QUALITY REPORTS

VIRGINIA’S TMDL
PROCESS
Four Mile Run Bacteria TMDL
March 25, 2002
Alexandria, VA
What is a TMDL ?
• TMDL = “Total Maximum Daily Load”
• TMDL = pollution budget
» TMDL = Sum (WLA)+ Sum (LA)+ MOS
• Required elements:
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–
–
–
meets water quality standard;
considers all sources incl. background
contains TMDL, WLA, LA and MOS
addresses seasonality, critical condition, and
reasonable assurance
How is a TMDL developed?
• Identify all sources of a given pollutant
• Calculate the amount of pollutant
entering the stream from each source
• Calculate - by source - the pollutant
reductions needed to attain water
quality standards
• For each source, allocate the
allowable loading and
include Margin of Safety
Water Quality Standards
• Listing of impaired waters and TMDL
development are based on WQ standards.
• Standards are regulations based on federal
and state law that set:
– numeric and narrative limits on pollutants.
• Purpose of standards:
– protection of 5 designated uses: aquatic life,
fishing, shellfish, swimming, & drinking water
– restoration of state waters - TMDLs
Current Fecal Coliform Standard
• Geometric mean of 200 counts per 100 ml.
• Instantaneous of 1000 counts per 100 ml.
• Revisions:
– Change in criteria from fecal coliform to E. coli
and enterococci by May 2002
– Considering re-designating some waters for
secondary contact, i.e. non-swimming use;
adoption by Fall 2002 if approved
– www.deq.state.va.us/wqs
Water Quality Monitoring and
Assessment Process
• Monitor and assess water quality - 305(b) Report
www.deq.state.va.us/water/wqmap.html
• Place impaired waters on 303(d) List
• Develop TMDL for impaired waters
• Implement TMDL
• Remove waters from 303(d) List when TMDL is
developed but track on 305(b) Report as having TMDL
TMDL Development Process
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Public meeting for TMDL development
Public meeting for Draft TMDL
Submit to EPA for
approval
SWCB adoption of
TMDL as regulation
• Include TMDL in
basin-wide WQMPs
TMDL Implementation
• Implementation plans not required under
CWA or by EPA’s current regulations.
• DEQ is required by state legislation to
develop implementation plan
• DEQ and DCR are developing framework
for NPS TMDL implementation plans
TMDL Implementation
• DEQ, DCR, VDH, other state agencies and
local stakeholders will coordinate on plan
development.
• TMDL implementation plans have been
completed for 13 impaired water segments
where TMDLs had been approved.
• Opportunity knocks!
Staged Implementation
• TMDLs include staged reduction targets
– allows most cost-effective measures to be
implemented first
– allows iterative evaluation of TMDL adequacy
in achieving water quality standard
– may ultimately require change
in WQS, e.g. different criterion
based on use
Four Mile Run TMDL
Implementation
• Local process
– TMDL Implementation Plan
• 1997 WQMIRA
• type, cost of measure
• implementation period, funding
– Ongoing local activities
• county and city environmental
programs
Four Mile Run TMDL
Implementation
• Examples for implementation strategies:
– Identify and repair leaking sewer lines
– Prepare and distribute educational materials on
proper handling of pet waste
– Develop, implement and enforce local
ordinances addressing pet waste
Future of TMDL Program
• Court Order requires forward movement and
completion of TMDLs
• Resource needs at all levels
• Expect changes
– WQS revisions
– ongoing EPA/state cooperation
Public Comment Information
• Comment period ends
– April 9, 2002
• Send comments to
Kate Bennett, VA DEQ
13901 Crown Ct
Woodbridge, VA 22801
phone (703) 583-3896, Fax (703) 583-3841
e-mail [email protected].
VIRGINIA’S TMDL
PROCESS
Four Mile Run Bacteria TMDL
March 25, 2002
Alexandria, VA