BASMAA Biotreatment Soil and Tree Roundtable Summary: Improvements for the Health of Trees

BASMAA Biotreatment Soil and Tree Roundtable Summary: Improvements for the Health of Trees

  • 7 October 2016
  • Author: Geoff Brosseau
  • Number of views: 1194
  • 0 Comments
The Municipal Regional Stormwater NPDES Permit Order No. R2-2015- 0049 (MRP) Provision
C.3 mandates that Regulated Projects meeting certain impervious surface area thresholds
include low impact development (LID) stormwater treatment measures in the project design.
The current MRP biotreatment soil specification (biotreatment soil) required to be used in LID
stormwater treatment measures (e.g. bioretention areas, tree well filters, etc.) consists of a 60-
70% sand/30-40% compost mix. This mix was specified to: 1) ensure long-term biotreatment
soil permeability of 5 inches per hour; 2) sustain healthy, vigorous plant life; and 3) maximize
stormwater runoff retention and pollutant removal. The complete specification may be viewed at
http://basmaa.org/

 

On June 30, BASMAA convened a biotreatment soil and tree round table to review the current
soil specifications to determine if improvements to the specification can be made to positively
impact the health of trees planted in biotreatment areas. Participants at the Roundtable
included numerous stakeholders: Municipal representatives, compost providers, soil suppliers,
soil laboratory technicians, civil engineers, landscape architects, soil scientists, construction
inspectors, and Water Board representatives.


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