Sampling systems handbook and approval guide

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7. Drop sample check

7.1 Preparation

For any drop sample checks, the facility must assist with arrangements to prepare the sampling equipment for testing.

The CGC prepares and evaluates any drop samples on equipment tested, approved, and maintained by the CGC.

7.2 Method

In a drop sample check, three samples of known quality and quantity per grain group are introduced into the delivery system as close to the primary sampler as possible. After the drop samples are dropped or pneumatically conveyed through the sample delivery system, they are recovered and analysed for quantity and quality (form I-109, Drop Sample Check). In order to pass the drop sample check, a minimum of two recovered samples per grain group must meet the requirements.

Requirements for drop samples:

• Drop samples must each weigh approximately four kilograms.
• For wheat samples, dockage components must meet the following requirements:
  • No. 25 Riddle material – Min. 1%, max. 2% (40 - 80 grams)
  • No. 5 buckwheat material – Min. 2%, max. 3% (80 - 120 grams)
  • No. 4 Aspiration material – Min. 0.5%, max. 1.0% (20 - 40 grams)
  • Total dockage – 140 - 240 grams
• For canola samples, dockage components must meet the following requirements:
  • No. 7 Round hole and riddle material – Min. 1%, max. 2% (40 - 80 grams)
  • .32 Slotted material – Min. 2%, max. 3% (80 - 120 grams)
  • No. 5 Aspiration material – Min. 0.5%, max. 1.0% (20 - 40 grams)
  • Total dockage – 140 - 240 grams
  Note: Where canola is unavailable, other grains such as peas, soy, or corn can be substituted. Dockage components must meet the same requirements as for canola.
• On recovery, the overall loss of a drop sample must not be more than 1.5 percent of the original weight (that is, not more than 60 grams in a 4-kilogram sample).
• Analysis results for the recovered samples must be within 10 percent of the values of the original sample for at least three of the four components.
• A minimum of 2 samples is required for limited acceptance for either wheat or other grain and acceptance in both wheat and other grain provide unlimited acceptance, provided that,
  1. a single component in all 3 attempts per grain group does not exceed the +/- 10%, or,
  2. the sampling system does not appear to be causing an unjustifiable deterioration to the sample or sample components on being delivered through the system

7.3 Subject to CGC discretion

Before granting final approval or certification of an automatic sampling system, the CGC will review the system in a way that matches its usual day-to-day operation. Where possible, this evaluation will be conducted at the same time as official CGC service is provided after a successful drop sample check, and in a way that matches the prospective operation of the sampling system at the facility.

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