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�, GT7 <br /> 1 <br /> SIERRA <br /> CLUB <br /> FOUNDED 1.892 <br /> IFAS and FDEP Publications in Support of Strong Ordinance Provisions <br /> Multiple IFAS and FDEP publications have been used to support the adoption of strong,rainy season <br /> ban urban fertilizer ordinances in the Central and South zones of Florida: <br /> RIE: Turf growing and dormancy seasons; leaching <br /> Dr. Laurie Trenholm's most recent research,upon which she has based previous growing season-related <br /> comments made to the Brevard County Commission is provided here: <br /> http:Hgardeningsolutions ifas ufl edu/cice/faculty/pdf/pubs/trenholm nitrate leaching.pdf This research <br /> was completed in, and applies to, the North Region of Florida; a different Urban Turf Rule(RULE 5E- <br /> 1.003(2)region, a different USDA hardiness zone, and a different growing season than that of Brevard <br /> County and the City of Orlando. Brevard County and the City of Orlando are located in the"Central <br /> Region." <br /> What is especially remarkable is that had Trenholm's research been done in the Central Zone, it still <br /> would not contradict a rainy season ban in any way. The leaching rates found in the study, although <br /> referred to as "minimal" by Dr. Trenholm,would add tons and tons of leachate into the watershed when <br /> the cumulative impact is calculated; these calculations were made by the Tampa Bay Estuary Program <br /> for the Tampa Bay watershed and came out to 75.3956 tons per year(see below): <br /> Using the LOWEST reported annual leaching rate for ESTABLISHED St.Augustine grass from the Trenholm study,regardless <br /> of application rates(see Table 2 of the report=0.9 kg/ha)applied to low/med density residential areas in the Tampa Bay <br /> watershed,the GW loads to the system would approximate the values below. <br /> Annual <br /> Reported <br /> Leaching <br /> Rate from <br /> 2007LULC Square Meters(m2) HA Study kg Leached lbs Leached Tons <br /> Low Density Residential 412773484.9 41277.35 0.9 37149.61364 81900.87856 40.95044 <br /> Med.Density Residential 347201416.8 34720.14 0.9 31248.12751 68890.32874 34.44516 <br /> TOTAL 150791.2073 75.3956 <br /> s9 � L�y <br />