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WASTEWATER LAGOON RENOVATIONS Project Description: The project involved the redesign and lining of two existing 750,000 gallon waste titanium dioxide sludge storage lagoons. First, the lagoons were redesigned to meet current hazardous waste regulations, then all pumpable sludge was vacuumed from the lagoon followed by cleaning and shaping with excavation equipment. It was important that final lines and grades achieved by heavy excavation equipment match those indicated on the design drawing. Liner panels are pre-cut at the factory to match the design drawing and will fit perfectly in the lagoon if the correct earthen grades are established. Lagoon construction consisted of primary and secondary liners with leak detection zones located between the liners and underneath the secondary liner. The rough cut lagoon bottom was lined with six inches and sand and a four inch perforated fabric encapsulated leachate/groundwater detection pipe. The detection pipe was extended to a thirty-six inch diameter concrete observation sump. The entire site was then lined with a layer of typar geotextile stabilization fabric. The fabric is covered with a 30 mil thick polyvinyl chloride synthetic secondary liner. The secondary liner was then covered with another layer of typar fabric. A witness zone was then constructed consisting of a half inch thick high density polyethylene geogrid overlain with another layer of typar fabric. A leachate detection line was installed through the secondary liner on the low end of the sloped lagoon bottom. The geogrid provides space between the primary and secondary liner and allows fluid to flow to the low end of the lagoon where the leachate detection pipe collects the liquid and directs it to an observation sump. The entire witness zone was then covered with a 36 mil thick scrim reinforced chlorinated polyethylene alloy primary liner.