By Douglas Jones


Revisions to the Florida Department of Environmental Protection’s (FDEP) Biosolids Rule
(62-640, Florida Administrative Code) became effective on August 29, 2010. All land
application sites must be permitted under the revised regulations by January 1, 2013.
Among the more significant changes are new testing requirements for soil and management of
the site in accordance with nutrient management planning. Under the revised rules, Nutrient
Management Plans replace the old Agricultural Use Plans and they must include background
metals sampling, soil fertility testing, phosphorus assessment, and crop yields.
An integral part of nutrient management planning is determining whether biosolids applied to a
site is limited by nitrogen or phosphorus loading. This paper reviews methods used to calculate
the Phosphorus Index for a site. A case study will be presented that demonstrates the potential
impact of the revised regulations on the quantity of biosolids that may be applied to a site.

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Doug Jones is a Senior Project Manager with Chastain-Skillman, Inc. He has masters of science degrees in engineering and microbiology from the University of South Florida. He is a registered Professional Engineer and Microbiologist with over 30 years of experience. He is a member and past chair of the ASCE Water Supply Engineering Committee.