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<tr>
 
<tr>
 
<th>  </th>
 
<th>  </th>
<th colwspan=2>Particulate P</th>
+
<th colspan=2>Particulate P</th>
 
<th colspan=2>Dissolved P</th>
 
<th colspan=2>Dissolved P</th>
 
</tr>
 
</tr>

Revision as of 15:01, 5 September 2013

Percent P Removed Via Non-Volume Reduction Treatment
Link to this table
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)