Percent P Removed Via Non-Volume Reduction Treatment

Percent P Removed Via Non-Volume Reduction Treatment
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	Particulate P		Dissolved P
	Current	Proposed	Current	Proposed
No underdrain	0%	0%	0%	0%
Elevated underdrain	45%	Is soil P content tested to be < 36 mg/kg per Mehlich III test? If yes, 40 % If no, 0%	0%	Is soil P content tested to be < 36 mg/kg per Mehlich III test? If no, 0% If yes, is there at least 2 feet of soil above the elevated underdrain? If yes, 20% credit, If no, credit = 0.2*x Where x = (soil depth above elevated underdrain) /2’ Credit for approved P-sorbing soil amendments*? For iron enhanced soils, Imbrium or WTRs, additional 40% credit
Underdrain at the bottom	91%	Is soil P content tested to be < 36 mg/kg per Mehlich III test? If yes, 40 % If no, 0%	0%	Is soil P content tested to be < 36 mg/kg per Mehlich III test? If yes, 20 % If no, 0% Does the system include approved P-sorbing soil amendments*? For iron enhanced soils, Imbrium or WTRs, additional 40% credit
	Internal Water Storage (IWS)	Is soil P content tested to be < 36 mg/kg per Mehlich III test? If yes, 40 % If no, 0%		Is soil P content tested to be < 36 mg/kg per Mehlich III test? If yes, 20 % If no, 0% Does the system include approved P-sorbing soil amendments*? For iron enhanced soils, Imbrium or WTRs, additional 40% credit

Approved P sorption amendments:

• 5% by volume elemental iron filings above IWS or elevated underdrain
• Minimum 5% by volume sorptive media above IWS or elevated underdrain
• Minimum 5% by weight water treatment residuals (WTR) to a depth of at least 10 cm (1/3 foot)
• Other P sorptive amendments with supporting third party research results showing P reduction for at least 20 year lifespan, P credit commensurate with research results (see Task 7 for examples of other P sorptive amendments currently being studied)