| Sims and A. Wolf, eds., Recommended Soil Testing Procedures for the Northeastern United States. Northeast Regional Bulletin #493. Newark: Agricultural Experiment Station, University of Delaware.</ref>. This SME procedure should also be used to measure concentrations of [[soluble salts]] and [[nitrogen]] in green roof growing media. | | Sims and A. Wolf, eds., Recommended Soil Testing Procedures for the Northeastern United States. Northeast Regional Bulletin #493. Newark: Agricultural Experiment Station, University of Delaware.</ref>. This SME procedure should also be used to measure concentrations of [[soluble salts]] and [[nitrogen]] in green roof growing media. |
| [[File:Phosphorus cycle bioretention images large a10-006f1.jpeg|550px|thumb|See above an example of the phosphorous cycle in a bioretention system. The cycle can be altered depending on the specific design configuration of the LID, including the adoption of a saturated zone, type and amouNT of mulch used and [[Bioretention media|sorbitive media]] included or not<ref>Roy-Poirier, A., Champagne, P., and Filion, Y. 2010. Bioretention processes for phosphorus pollution control. Environmental Reviews, 18(NA), pp.159-173.</ref>.]] | | [[File:Phosphorus cycle bioretention images large a10-006f1.jpeg|550px|thumb|See above an example of the phosphorous cycle in a bioretention system. The cycle can be altered depending on the specific design configuration of the LID, including the adoption of a saturated zone, type and amouNT of mulch used and [[Bioretention media|sorbitive media]] included or not<ref>Roy-Poirier, A., Champagne, P., and Filion, Y. 2010. Bioretention processes for phosphorus pollution control. Environmental Reviews, 18(NA), pp.159-173.</ref>.]] |
| Amendments to green roof growing media to address P deficiency should be prescribed by the media manufacturer or product vendor. Where soil P concentration is found to be higher than the Acceptance Criteria range, and the BMP drains to a nutrient sensitive receiving water, continuous monitoring during natural or simulated storm events should be undertaken that includes sampling and testing of nutrient concentrations (i.e., Phosphorus and Nitrogen) in sub-drain or surface flows from the BMP to evaluate if the exceedance is negatively impacting effluent quality and if corrective actions are warranted. Corrective action could involve incorporating a soil [[additives|additive]] that increases phosphorus retention, or replacement of part or all of the media or topsoil with material that is within the design or product specification. | | Amendments to green roof growing media to address P deficiency should be prescribed by the media manufacturer or product vendor. Where soil P concentration is found to be higher than the Acceptance Criteria range, and the BMP drains to a nutrient sensitive receiving water, continuous monitoring during natural or simulated storm events should be undertaken that includes sampling and testing of nutrient concentrations (i.e., Phosphorus and Nitrogen) in sub-drain or surface flows from the BMP to evaluate if the exceedance is negatively impacting effluent quality and if corrective actions are warranted. Corrective action could involve incorporating a soil [[additives|additive]] that increases phosphorus retention, or replacement of part or all of the media or topsoil with material that is within the design or product specification. |