traditional methods such as a slurry wall were initially considered for construction, engineers ultimately chose to install more than 600 linear feet (183 m) of SG-525 PVC sheet pile for containment. Beginning in August 2007, the PVC sheet piles were installed without any sealant in the locks to a depth of 17 feet (5 m) (Figure 6). The sheets were installed into soils with blow counts in excess of 50 using a steel mandrel system. Engineers checked the groundwater post-installation of the sheet pile system through the use of monitoring wells on a quarterly basis. The sheet pile wall was effective in containing the flow of contaminants from the site (EPA 2008). Elementis, Texas The groundwater and soils at this Corpus Christi, Texas, manufacturing plant became contaminated with high concentrations of benzene due to operations at El Paso Merchant EnergyPetroleum petroleum plant. Engineers were tasked with developing a cutoff wall solution that had a high resistance to degradation and minimized excavation and ground disturbance. The engineers working on the project specified SG-625 PVC sheet piling manufactured using coextrusion technology and hydrophilic sealant to be used in the interlocks to create an all but impermeable barrier. The SG-625 profile is [At the Florida Gas Plant site] off-site migration of coal tar and dense and light nonaqueous phase liquids (D/LNAPLs) and organic chemicals posed a threat to groundwater, wetlands and nearby residents. Invest in Your Future Join GMA Today! Influence and grow the geosynthetics market through membership in IFAI's Geosynthetic Materials Association. > Access the industry's most comprehensive resources all year round. > Advocate for your industry at the federal and state level. > Read Geosynthetics magazine and stay informed. Visit IFAI.com/Geosynthetics to learn more. www.GeosyntheticsMagazine.com 0820GS_p28-37.indd 35 35 7/22/20 11:12 PMhttp://www.IFAI.com/Geosynthetics http://www.GeosyntheticsMagazine.com