Changes

For BMPs including: [[bioretention]], [[enhanced grass swales]], [[vegetated filter strips]], [[absorbent landscapes]], [[green roofs]] and, bulk materials including: [[compost]], and [[topsoil]], phosphorus (P) should be measured as extractable phosphorus. Extractable P is the portion that is easily available to organisms like plants and algae i.e. is the measure of immediate concern to water quality.

For BMPs including: [[bioretention]], [[enhanced grass swales]], [[vegetated filter strips]], [[absorbent landscapes]], [[green roofs]] and, bulk materials including: [[compost]], and [[topsoil]], [[phosphorus]] (P) should be measured as extractable phosphorus. Extractable P is the portion that is easily available to organisms like plants and algae i.e. is the measure of immediate concern to water quality.

The quantity of extractable P is determined through acid or base extraction of a sample and testing the concentration in solution by a soil testing laboratory. Commonly used extraction methods on soil samples are the Bray and Kurtz P-1 procedure for non-calcareous soil <ref>Bray, R.H. and Kurtz, L.T. 1945. Determination of total, organic, and available forms of phosphorus in soils. Soil Science, 59: 39-45.</ref>or the Sodium Bicarbonate (Olsen) method for calcareous soil <ref>Olsen, S.R., Cole, C.V., Watanabe, F.S., and Dean, L.A. 1954. Estimation of available phosphorus in soils by extraction with sodium bicarbonate. USDA Circular 939:1-19. Gov. Printing Office Washington D.C.</ref>.  

The quantity of extractable P is determined through acid or base extraction of a sample and testing the concentration in solution by a soil testing laboratory. Commonly used extraction methods on soil samples are the Bray and Kurtz P-1 procedure for non-calcareous soil <ref>Bray, R.H. and Kurtz, L.T. 1945. Determination of total, organic, and available forms of phosphorus in soils. Soil Science, 59: 39-45.</ref>or the Sodium Bicarbonate (Olsen) method for calcareous soil <ref>Olsen, S.R., Cole, C.V., Watanabe, F.S., and Dean, L.A. 1954. Estimation of available phosphorus in soils by extraction with sodium bicarbonate. USDA Circular 939:1-19. Gov. Printing Office Washington D.C.</ref>.  

The Olsen method is recommended as the default to use for typical Ontario soils <ref>Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA). 2006. Soil Fertility Handbook. Publication #611. Toronto, Ontario.</ref>. Calcareous soils are mostly or partly composed of calcium carbonate (i.e., lime or limestone). The Olsen extraction method should be used if the soil contains more than 2% calcium carbonate <ref>Frank, K., Beegle, D., Denning, J. 2012. “Phosphorus” In Recommended Chemical Soil Test Procedures for the North Central Region. North Central Regional Research Publication No. 221. Missouri Agricultural Experimental Station.</ref>

The Olsen method is recommended as the default to use for typical Ontario soils <ref>Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA). 2006. Soil Fertility Handbook. Publication #611. Toronto, Ontario.</ref>. Calcareous soils are mostly or partly composed of calcium carbonate (i.e., lime or limestone). The Olsen extraction method should be used if the soil contains more than 2% calcium carbonate <ref>Frank, K., Beegle, D., Denning, J. 2012. “Phosphorus” In Recommended Chemical Soil Test Procedures for the North Central Region. North Central Regional Research Publication No. 221. Missouri Agricultural Experimental Station.</ref>

For [[green roof media]], the Saturated Media Extract (SME) method should be used <ref>Green Roofs for Healthy Cities. 2011. Advanced Green Roof Maintenance: Participant’s Manual. Toronto, ON.</ref>. In this extraction procedure, a sample of the media is saturated with deionized water containing a small amount of Pentetic acid (DTPA) to enhance extraction of micro-nutrients Warnacke, D. 1995. “Recommended Test Procedures for Greenhouse Growth Media.” In J. Thomas

For [[green roof media]], the Saturated Media Extract (SME) method should be used <ref>Green Roofs for Healthy Cities. 2011. Advanced Green Roof Maintenance: Participant’s Manual. Toronto, ON.</ref>. In this extraction procedure, a sample of the media is saturated with deionized water containing a small amount of Pentetic acid (DTPA) to enhance extraction of micro-nutrients <ref>Warnacke, D. 1995. “Recommended Test Procedures for Greenhouse Growth Media.” In J. Thomas

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.

==Evaluation==

==Inspection==

===Construction inspections===

===Construction inspections===

If laboratory testing indicates the extractable phosphorus concentration is not within the design or product specification range, notify the supplier, issue a “do not install” order to the construction site supervisor and contact the design professionals and property owner or project manager to determine corrective actions.

If laboratory testing indicates the extractable phosphorus concentration is not within the design or product specification range, notify the supplier, issue a “do not install” order to the construction site supervisor and contact the design professionals and property owner or project manager to determine corrective actions.