Thank you for the response and information, please remember it's simply a fledgling business plan, and I am merely in a planning stage at best; your providing local geological contacts is much appreciated.
According to DNR's website the local area is- Columbia River Basalt:
In the western portion of the Columbia Basin, the flows of the Columbia River Basalt Group have been folded into a series of giant anticlines that strike east-west to southeast-northwest. This region is called the Yakima Fold Belt subprovince. The anticlines have steep dips north of the fold axis and overturned beds in numerous locations. The south flanks of the anticlines have gentle dips. Folding was initiated during middle to late Miocene time and has continued to this day. Crossing the Columbia Basin is a northwest-trending tectonic feature called the Olympic Wallowa Lineament. Right-lateral displacement on this transform structure influenced the formation of the Pasco Basin.
In any case, if the basalt on the property is not safe and/or suitable for climbing, so be it; the begining of the end to a rock climbing element.
Not being a rock climber, I have to appreciate your candid risk warnings, just thought a rock climbing element would encourage being outdoors here as well as spark an interest in the sport, thereby supporting both a personal vision and regional rockclimbing enthusiasts, as the sun shines nearly 320 days a year here, so perfect for outdoor passions, such as rock climbing.