The amended language under 12VAC5-610-950.D.2. bases the minimum area requirement on the width of a trench excavation without knowing the amount "overdig" in that excavation.  Suggest the following revisions as "highlighted" below:

D. Sizing of absorption trench area.

2. Area reduction. See Table 5.4 for percent area reduction when gravelless material or low pressure distribution is utilized. A reduction in area shall not be permitted when flow diversion is utilized with low pressure distribution.  When gravelless material is utilized proposed, the design width of the trench excavation shall be used to calculate minimum area requirements for absorption trenches.