Earth retaining walls are common in most construction, but can be extremely expensive depending on approach. Costs of $30 to $40 per square foot of wall face are usually found. PND invested in research and development and subsequently lowered this cost by developing a wall, of increased life expectancy, which could be built using un-skilled labor and a minimum of imported materials. Structure requirements resulted in a high-quality, aesthetically pleasing geotextile and timber wall which costs less than $20 per square foot to construct. The first application, for a harbor parking area in Juneau, reduced project cost by over fifty percent. There are currently plans for construction of additional walls, including a 20-foot-high wall in Washington.