environmentally sensitive area, or is of sufficient scale to affect water quality. (1) Repair and maintenance of existing piers , walkways, observation decks, wildlife management shelters, boathouses, and other similar water-related structures provided that there is no increase in structure footprint
Read it in the chapter →How this ordinance defines it
The operative definition is the local one. Codes routinely subdivide a category into tiers — “day care 2, family”, “group home 2” — and attach different permissions to each, so only Alexandria’s own text settles what this covers.