1Ethanol in Groundwater at a Northwest Terminal Workshop on the Increased Use of Ethanol and Alkylates in Automotive Fuels in California

• In March, 1999 a 19,000-gallon release of neat ethanol occurred from an above ground storage tank • Following the ethanol release, nine monitoring wells were installed in the fill and sampled six times between June 1999 and December 2000 • In May 2000 a sampling protocol was implemented to measure for indicators of in situ bioremediation • In December 2000 eight additional monitoring wells were installed in the shallow fill and the deeper alluvium • The objective of the groundwater sampling program is to delineate the ethanol plume and understand the impact of ethanol on the existing nonaqueous phase liquid (NAPL) and dissolved hydrocarbon plumes Buscheck et al., 2001 3The Cosolvent Effec