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Grounding per ESD Association…

"The first step in ensuring that everything in an EPA is at the same electrical potential is to ground all conductive components of the work area (i.e., worksurfaces, people equipment, etc.) to the same electrical ground point. This point is called the common point ground and is defined by ANSI/ESD S6.1 as 'a system or method for connecting two or more grounding conductors to the same electrical potential.' ...The next step in completing the ground circuit is to connect the common ground point to the AC equipment ground an auxiliary ground, as defined in ANSI/ESD S6.1" [ESD Handbook ESD TR20.20 section 5.1.3 Basic Grounding Requirements]

"The grounding conductors (wires) from wrist straps, worksurfaces, flooring or floor mats, tools, fixtures, storage units, carts, chairs, garments, and other ESD technical elements may or may not contain added resistance. Where added resistance is not present, a direct connection point is acceptable and recommended. 

Note: Manufacturers may add resistance to the grounding conductors for purposes other than ESD (e.g. current limiting). Added resistance is acceptable for the purposes of controlling ESD provided electrostatic accumulation does not exceed specific EPA requirements. The typical added resistance in grounding conductors is 1 megohm, although other values may be specified." [Grounding ANSI/ESD S6.1-2009 section 5.3.3 ESD Technical Element Conductors]

"The resistance of the conductor from the groundable point ground of any ESD technical element (e.g. worksurface, floor, chair, wrist strap, etc.) to the common point or common connection point shall not be greater than 1 ohm. Where a resistor is used in the grounding conductor, the total resistance shall include the value of the resistor." [Grounding ANSI/ESD S6.1-2009 section 6.4.1]