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using the procedures described below unless other methods are <br />approved by the APCO. <br />6.2.2 Samples shall be taken from at least three (3) inches below the surface <br />of the pile using a driven -tube type sampler, capped and sealed with <br />inert materials, and extruded in the lab in order to reduce the loss of <br />volatile materials; or by using a clean brass or stainless steel tube (at <br />least three (3) inches long) driven into the soil with a suitable <br />instrument. The ends of the brass tube shall then be covered with <br />aluminum foil, then plastic end caps, and finally wrapped with a <br />suitable tape. The samples shall then be immediately placed on ice, <br />or dry ice, for transport to a laboratory. <br />6.2.3 Chain -of -custody records shall be kept to document possession of a <br />sample from the time it is taken in the field until it is analyzed. <br />6.3 Offsets <br />If a decontamination/treatment system is required solely to comply with the <br />requirements of this rule, such system shall not be subject to Rule 2201 (New <br />and Modified Stationary Source Review), , provided the system includes Best <br />Available Control Technology and the emissions do not exceed two (2) tons <br />per year of any affected pollutant. <br />7.0. Compliance Schedule <br />The requirements of this rule become effective September 19, 1991 except for the <br />following: <br />7.1 Any soil excavation or decontamination project which received District <br />approval prior to September 19, 1992 may continue their operation until the <br />soil is no longer contaminated or until July 1, 1992, whichever comes first. <br />7.2 Any decontamination system whose initial installation occurs on or after <br />September 19, 1992 shall be in full compliance with the provisions of the rule <br />upon initial operation. <br />SJVUAPCD 4651 - 5 12/17/92 <br />