Maryland Code, Public Utilities § 12-126

(1) is within 5 feet of the horizontal plane of the underground facility; or

(2) because of planned blasting, is so near to the underground facility that the underground facility may be damaged or disturbed.

(b)(1) An owner-member or its contract locator shall mark the location of its underground facility as specified under subsection (a) of this section by marking on the ground within 18 inches on a horizontal plane on either side of the underground facility.

(1) mark the location of the owner-member's underground facility and report to the underground facilities information exchange system that the underground facility has been marked; or

(2) report to the underground facilities information exchange system that the owner-member has no underground facilities in the vicinity of the planned excavation or demolition.

(d)(1) If an owner-member or its contract locator is unable to mark the location of the owner-member's underground facility within the time period prescribed in subsection (c) of this section because of the scope of the proposed excavation or demolition, the owner-member shall:

(2) If the owner-member or its contract locator and person that intends to perform the excavation or demolition cannot reach a mutually documented agreement for marking under paragraph (1) of this subsection, the owner-member or its contract locator shall mark that portion of the site where excavation or demolition will first occur, and the owner-member or its contract locator shall mark the remainder of the site within a reasonable time.

(3) If, due to circumstances beyond the control of an owner-member or its contract locator and for reasons other than those specified in paragraph (1) of this subsection, an owner-member or its contract locator is unable to mark the location of the owner-member's underground facility within the time period prescribed in subsection (c) of this section, the owner-member or its contract locator shall report to the underground facilities information exchange system that an extension is required.

(4) In connection with extensive or contiguous excavation or demolition projects, the person performing the excavation or demolition and the owner-member or its contract locator may establish a working agreement regarding the time periods for marking the underground facility.