Whenever an operator conducts an annual leakage survey of all mains, or a portion of the mains, in its distribution system, any sustained reading of four percent or less gas-in-air on a CGI at an isolated test point outside the curbline or shoulder of the road can be considered a nonreportable reading except where found in manholes, vaults or catch basins.
N.Y. Comp. Codes R. & Regs. Tit. 16 § 255.821