Steve Harrison, Environmental Manager

Bureau of Entomology and Pest Control

-Mosquito Control Section

62-347 —Stormwater Quality Rule(Effective on or after July 1, 2011)(Effective on or after July 1, 2011)

62-347.010(1)-Stormwater treatment quality only; not quantity

-Does not replace current permit requirements; only changes treatment and design criteria

(2)-Incorporates by reference Stormwater Quality Applicant’s Handbook-Identification of rules of Water Management Districts (WMDs) that are superseded (likely to be moved to WMD rules)

(3)Does not affect agriculture or silviculture

NEW RULE OBJECTIVES

– Increase nutrient removal– Establish requirements for

discharges to impaired waters– Statewide consistency– Update BMP design criteria– Allow BMP Treatment Train credits– Encourage low impact design– Encourage retrofitting

NON-OFW’sNON-OFW’s OFW’sOFW’s IMPAIRED IMPAIRED WATERSWATERS

IMPAIRED IMPAIRED WATERSWATERS

WITH ADOPTED TMDL or WITH ADOPTED TMDL or BMAPBMAP

RedevelopmentRedevelopment

Sites ≤ X Acres Sites ≤ X Acres

85% or Post=Pre, 85% or Post=Pre, whichever is less whichever is less unless feasibility unless feasibility analysis analysis demonstrates demonstrates lower level is lower level is appropriateappropriate

RedevelopmentRedevelopment

Sites ≤ X AcresSites ≤ X Acres

Post=Pre, unless Post=Pre, unless feasibility analysis feasibility analysis demonstrates lower demonstrates lower level is appropriate level is appropriate

RedevelopmentRedevelopment

Sites ≤ X AcresSites ≤ X Acres

85% or Post=Pre, 85% or Post=Pre, whichever is less whichever is less unless feasibility unless feasibility analysis analysis demonstrates lower demonstrates lower level is appropriate level is appropriate AND Net AND Net improvement for improvement for pollutant not pollutant not meeting water meeting water quality standards quality standards

RedevelopmentRedevelopment

Sites ≤ X AcresSites ≤ X Acres

85% or Post=Pre, 85% or Post=Pre, whichever is less whichever is less unless feasibility unless feasibility analysis analysis demonstrates lower demonstrates lower level is appropriate level is appropriate AND Net AND Net improvement or improvement or TMDL/BMAP % TMDL/BMAP % reduction, reduction, whichever is whichever is greater, pollutant greater, pollutant not meeting water not meeting water quality standards quality standards

PERFORMANCE STANDARDSPERFORMANCE STANDARDS

Performance Standard for Stormwater Discharges (62-40, F.A.C.)

Erosion and sediment controlRetain sediment on-siteNot violate turbidity standard

Stormwater quality – Original 198280% average annual load reduction95% average annual load reduction**

“Of Total Suspended Solids”Stormwater quality –1990

80% average annual load reduction95% average annual load reduction**

“Of pollutants that cause or contribute”

** 95% for OFW’s (Outstanding Florida Waters)

Problems with “Old Way”Problems with “Old Way” WMD’s were allowed to adopt their own BMP WMD’s were allowed to adopt their own BMP

design criteria – resulted in varying degrees of design criteria – resulted in varying degrees of treatments throughout the statetreatments throughout the state

Nutrient (mainly Nitrogen and Phosphorous) Nutrient (mainly Nitrogen and Phosphorous) enrichment has increased in surface and ground enrichment has increased in surface and ground waterswaters

BMPs were never updated to adequately deal BMPs were never updated to adequately deal with nutrient removalwith nutrient removal

Research shows that current design and Research shows that current design and performance criteria do not properly address performance criteria do not properly address nutrient loadings from typical stormwater runoff nutrient loadings from typical stormwater runoff conditions conditions (Example: Wet Detention = 43% Nitrogen removal)(Example: Wet Detention = 43% Nitrogen removal)

June 6, 2008

Caloosahatchee River October 15,

2005

SolutionsSolutions

Unified Stormwater Treatment Rule Unified Stormwater Treatment Rule (Draft Rule 62-347)(Draft Rule 62-347)

Update BMPs to meet new standards Update BMPs to meet new standards (New Stormwater Quality Handbook (New Stormwater Quality Handbook referenced in 62-347)referenced in 62-347)

Utilize BMP Treatment Trains to Utilize BMP Treatment Trains to achieve adequate treatmentachieve adequate treatment

Give credit for Low Impact DesignGive credit for Low Impact Design

BEST MANAGEMENT PRACTICES (BMPs) (BMPs)

Three basic types: – Retention BMPs: treatment volume is

recovered through percolation into the soil– Detention BMPs: detain stormwater and

discharge it at a specified rate – Source Control BMPs: nonstructural BMPs that

are used to either minimize the amount of stormwater generated or minimize the amount of pollutants getting into the stormwater

Specific BMPsSpecific BMPs Retention BasinsRetention Basins Underground Storage Underground Storage

and retention Systemsand retention Systems Underground Underground

Retention Retention Vault/ChamberVault/Chamber

SwalesSwales Vegetated Natural Vegetated Natural

BuffersBuffers Pervious PavementPervious Pavement Green Roof/Cistern Green Roof/Cistern

SystemSystem

Wet Detention SystemWet Detention System Managed Aquatic Managed Aquatic

Plant SystemPlant System Stormwater Stormwater

HarvestingHarvesting Wetland Stormwater Wetland Stormwater

Treatment TrainTreatment Train Underdrain FiltrationUnderdrain Filtration Chemical TreatmentsChemical Treatments

Low Impact DesignsLow Impact Designs

Concerns for Mosquito Control Industry?Concerns for Mosquito Control Industry?

Increase in mosquito Increase in mosquito breeding habitat?breeding habitat?

Routine inspections?Routine inspections?Larger systems?Larger systems?Maintenance of systems?Maintenance of systems?

Retention BMPsRetention BMPs

Detention BMPsDetention BMPs

Source Control BMPsSource Control BMPs

Natural Area Conservation Site Reforestation Disconnecting Directly Connected

Impervious Areas Florida-friendly landscaping Rural subdivisions