Kjeldsen, Sinnock & Neudeck, Inc., (KSN) was retained by Power Engineering Contractors Inc. to provide surveying and mapping services for the emergency replacement of four 36” raw sewage pump discharge pipes at the City of Stockton Regional Wastewater Control Facility.  The Facility pumping system includes four raw sewage pumps, four raw sewage pipes and has the capacity to transport 142 million gallons of raw sewage per day.  During the early months of 2008 staff at the plant became aware that the mortar lining of the discharge pipes was eroded and the exposed steel pipe was corroded, prompting an urgent repair project.  To minimize disruption to the plant the discharge pipes would be replaced in stages.  To accomplish this it was necessary to have the new discharge pipes prefabricated in the exact layout as the existing pipes before the replacement could begin.  By utilizing state of the art 3D laser scanning technology, KSN was able to provide the pipe fabricator with accurate 3D AutoCAD drawings of the existing pipe.  The information provided by KSN allowed the new discharge pipes to be fabricated as exact replicas quickly and accurately, so that the replacement project could stay on budget and within schedule.  The completed project allows the Stockton Municipal Utilities Department to continue providing wastewater treatment to the City of Stockton throughout the peak flows of winter without the risk of pipe failure and the risk of shutting down the plant.