© 2010 Malcolm Pirnie, Inc. All Rights Reserved
National Implications of the Federal Pollution Limits for the Chesapeake Bay Clean-Up
Clifton Bell, P.E., P.G.
Malcolm Pirnie, Inc.
757-873-4465
Challenges for Localities:Address Existing Nutrient Sources
UrbanStormwater
Wastewater WWTP Upgrades Failing septic systems
Stormwater retrofits Fertilizer controls
NewDevelopment
& Redevelopment
Wastewater
Challenges for Localities:Staying Under the Nutrient Cap
Strict stormwater controls
Advanced septic systems
Reuse / recycle Trading/offsets? Septic sprawl?
Urban Retrofits the Most Expensive Way to Reduce Nutrient Loads
AgriculturalPractices
WWTPUpgrades
UrbanStormwater
Retrofits
$5 - $150per lb phos.
$15 - $200per lb phos.
$3,000 - $20,000per lb phos.
Stormwater Retrofit Costs
Pond retrofits: $15-30k / impervious acre
Advanced retrofits: $75-300k / impervious acre
What regulators have asked:
Retrofit up to 20% of impervious surface in a single MS4 permit term (5 years).
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