Current through Register Vol. 54, No. 49, December 7, 2024
Section 250.703 - General attainment requirements for soil(a) For any standard selected, the attainment demonstration for the soil media shall be made at the point of compliance as defined in Subchapters B-D (relating to background standards; Statewide health standards; and site-specific standards)(b) The soil to which the attainment criteria are applied shall be determined by circumscribing with an irregular surface those concentrations detected during characterization which exceed the selected standard. Where this soil is to be removed from the site, the attainment demonstration applies to the base of the excavation defined by the limit of excavation.(c) Sampling points for demonstration of attainment of soils shall be selected to be random and representative both horizontally and vertically based on a systematic random sampling as set forth in a Department approved reference. If exceedances of a standard occur in a localized area, the Department may require additional characterization and remediation if three or more adjacent samples exceed the standard by more than ten times.(d) For statistical methods under § 250.707(b)(1)(i) (relating to statistical tests), the number of sample points required for each distinct area of contamination to demonstrate attainment shall be determined in the following way: (1) For soil volumes equal to or less than 125 cubic yards, at least eight samples.(2) For soil volumes up to 3,000 cubic yards, at least 12 sample points.(3) For each additional soil volume of up to 3,000 cubic yards, an additional 12 sample points.(4) Additional sampling points may be required based on site-specific conditions.(e) For statistical methods under § 250.707(b)(1)(ii) and (c), the minimum number of samples required for demonstrating attainment shall be as specified by the documentation of the chosen method.The provisions of this § 250.703 amended November 23, 2001, effective 11/24/2001, 31 Pa.B. 6395. This section cited in 25 Pa. Code § 250.707 (relating to statistical tests).