Section 830.507  Sampling Methods

Sample collection, preservation, and analysis must be done in a manner which assures valid and representative results.  A composite sample must be prepared by one of the following methods:

a)         Twelve grab samples, each 550 milliliters in size, must be taken from the end-product compost at the facility, in the following manner:

1)         Four grab samples from points both equidistant throughout the length and at the center of the windrow or other pile, at a depth not less than one meter from the surface of the windrow or other pile;

2)         Four grab samples from points both equidistant throughout the length and one quarter the width of the windrow or other pile, at a depth not less than half the distance between the surface and the bottom of the windrow or other pile; and

3)         Four grab samples from points both equidistant throughout the length and one eighth the width of the windrow or other pile, at a depth not less than half the distance between the surface and the bottom of the windrow or other pile.

4)         The twelve grab samples must be thoroughly mixed to form a homogenous composite sample.  Analyses must be of a representative subsample.  The sample holding times, sample container types and minimum collection volumes listed in Section 830.Table B shall apply; or

b)         Sampling methods set forth in Test Methods for Evaluating Solid Waste, Physical/Chemical Methods (SW-846), incorporated by reference at 35 Ill. Adm. Code 830.103.