Not all structures perform as the owners would like. PCC provides forensic geotechnical services designed to help identify the cause of the problems, risk factors, remedial actions and cost estimates. We work with clients and attorneys to provide expert witness services if litigation is considered. This geotechnical gallery includes a sampling of the various types of problems that PCC has addressed. The most common problems include: building damage due to excessive settlement; water seepage into basement levels of residential structures or underground parking garages; and slope stability failure, which is also know as landslides, sinkholes, floods due to natural causes or broken utility pipes. Retaining wall problems are very common. This is partly because there is a lack of attention to the design and/or construction and partly because not all walls are designed to last for long periods of time. For additional information, see the case studies below and Retaining Structures.