An alcoholic perfume solution with an improved tenacity when applied onto a surface is described. Arcs on which moves are to be performed are iteratively chosen for balancing excesses of vertices across the arcs until a stopping rule is satisfied. The dispersant is an amphiphilic block copolymer having an A segment that is a hydrophobic segment, a B segment that is a nonionic hydrophilic segment, and a C segment that is an ionic hydrophilic segment. The body and lid also include cutouts that are aligned when the lid covers the opening. The mechanical seal can further include a closed loop cooling channel in its outer cylinder that is connected to a circulating source of cooling fluid. A protective soil-impervious, liquid-permeable sheeting is placed atop and beneath the assembly for protecting the holes pipes from intrusion by soil.