Serving the Portland Metro area, Multnomah county, Washington county, Clackamas county, parts of Yamhill county, Portland, Beaverton, Lake Oswego, Tigard, Hillsboro, Tualatin, Aloha, Wilsonville, West Linn. M Leon Constructions expertise to diagnose and repair problems in all areas of the home. foundations, basements, crawl spaces, drainage problems, dry rot, retaining walls & more. Remove standing water, waterproof interior and exterior or your home, build basement retaining walls repair cracks, reinforce foundation, basement waterproofing, French drains, and install dry wells and drain fields.