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Green Roof Media Testing
Green
roofs are increasing in popularity in the US because of the benefits they
provide over traditional roofs such as reducing stormwater runoff and improving
runoff quality; reducing air conditioning costs; lengthening roof membrane life; and providing an aesthetically
pleasing roof. Green
roof media testing is important for characterizing the physical and chemical
properties of the medium to ensure that it meets the requirements of the intended
use. The
Agricultural Analytical Services Laboratory employs test procedures recommended
by the FLL (Forschungsgesellschaft Landschaftsentwicklung Landschaftsbau) in
its Guideline for the Planning, Execution and Upkeep of Green-Roof Sites
(Release 2008) or equivalent ASTM methods when available.
To submit a
green roof media sample for analysis, send a 5 gallon (20 L) sample with a
completed submission form
specifying test(s) requested to the Agricultural Analytical Services
Laboratory.
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GR01A: Samples
are analyzed for particle size distribution (< 0.002 to > 12.5 mm) with
graphical display of results relative to FLL limits, dry weight density, density
at maximum water-holding capacity, total porosity, air-filled porosity at
maximum water-holding capacity, water
permeability factor (hydraulic conductivity), pH, total soluble salts, organic
matter, phosphorus, potassium, calcium, magnesium, nitrate and ammonium.
Methods followed are those specified in the FLL Guideline for the
Planning, Execution and Upkeep of Green-Roof Sites or equivalent ASTM methods
(ASTM E2399) with the exception of total porosity which is determined using a measured, not estimated, particle density. This test package meets the FLL
requirement for intensive and extensive multi-course and multi-layer
systems.
....................................................................................................................$260.00
GR01B: Test
GR01B is the same as Test GR01A but provides results for pH, total soluble
salts, phosphorus, potassium, calcium, magnesium, nitrate-nitrogen and
ammonium-nitrogen using the saturated media test procedure instead of FLL test
methods.
Saturated media test results for boron, copper, iron, manganese, sodium,
and zinc are also provided.
..... .............................................................................$235.00
GR02: Test
GR02 is the same as Test GR01 but without the plant nutrients phosphorus,
potassium, calcium, magnesium, nitrate and ammonium.
It may be used alone or in combination with alternative tests to those
recommended by FLL for plant nutrients (see Optional Tests below). Methods followed are those specified in the FLL
Guideline for the Planning, Execution and Upkeep of Green Roof Sites
or equivalent ASTM methods (ASTM E2399) with the exception of total porosity which is determined using a measured, not estimated, particle density. This
test package meets the FLL requirement for single
layer extensive system..................................................$210.00
GR03: Samples
are analyzed for the percentage of silt-sized (< 0.05 mm) particles; dry
weight density, density at maximum water-holding capacity, total porosity, water
permeability factor (hydraulic conductivity), pH, and total soluble salts.
Methods followed are those specified in the FLL Guideline
for the Planning, Execution and Upkeep of Green Roof Sites
or equivalent ASTM methods (ASTM E2399) with the exception of total porosity which is determined using a measured, not estimated, particle density. This
test package meets the FLL requirement for drainage courses
for extensive multi-course
systems......................................................................................................$180.00
Sample
size required for tests GR01A, GR02A, GR02 or Gr03:
approximately 5 gallons (20 L)
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Calcium
Carbonate Equivalence (CCE): Test
for measuring a material's neutralizing value expressed as calcium carbonate
equivalence (ASTM Method
C-25).............$25.00
Mehlich 3 extractable
nutrients:
Test for extractable phosphorus, potassium, calcium, and magnesium by the
Mehlich 3 method.............................................$20.00
Total
metals/trace elements:
Test for total sorbed arsenic, cadmium, copper, molybdenum,
nickel, lead, selenium, and zinc (EPA Method 3050B) and total mercury (EPA
Method 7473)
......................................................................................$130.00
Saturated paste pH, salts and
nutrients: Test
for pH, nitrate-nitrogen, total soluble salts, phosphorus, potassium, calcium,
magnesium, sodium, boron, copper, iron, manganese, and zinc using the saturated
media extract method with DTPA.........$30.00
Saturated paste pH, salts,
nutrients plus percent solids and organic matter: Test
for pH, nitrate-nitrogen, total soluble salts, phosphorus, potassium, calcium,
magnesium, sodium, boron, copper, iron, manganese, and zinc using the saturated
media extract method with DTPA plus percent solids and organic
matter..............$54.00
Saturated
Water Permeability of Granular Drainage Media (ASTM E2396): Test
for measuring the water permeability of coarse granular materials used in the
drainage layers of green roof systems (ASTM Method
E2396)..........................................$85.00
Maximum
Media Density:
This
test determines the density, percent moisture and water permeability at maximum
water-holding capacity (ASTM Method
E2399).
Results for total and air-filled porosity are also provided.
Three gallon (12 liter) sample size
required..........................................................................................................$95.00
Particle
size distribution:
This
test determines the particle size distribution of the media (< 0.002 to > 12.5 mm).
One-half
gallon (2 liter) sample size required
.......$80.00
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