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. 3 0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS r Between June 18, and August 19, 2004, the groundwater surface dropped an average of 0 79 feet, the groundwater gradient increased from 0 0011 to 0 0086 foot/foot, and the groundwater flow direction remained toward the northeast The depth to groundwater beneath the site was at its lowest level, since the monitoring wells were installed in July 2002 Otherwise, the groundwater surface characteristics are consistent with historical and seasonal trends Between June 18, and August 19, 2004, gasoline compounds in groundwater generally declined at MW-1, and increased at MW-2 and MW-3 Concentrations of gasoline compounds in groundwater at MW-1 have generally declined, since the monitoring wells were installed in July 2002, probably due to source removal efforts and natural attenuation processes In the last three quarterly sampling events on March 24, June 18, and August 19, 2004, increasing concentrations of MTBE have been detected in the perimeter wells (MW-2 and MW-3) As such, it appears that MTBE has migrated away from the source area in the downgradient direction, and that the extent of impacted groundwater is undefined r On May 3, 2004, EHD directed that a site conceptual model be submitted On July 30, 2004, Ramage Environmental published Site Conceptual Model Ramage Environmental recommends that the plume of impacted groundwater continue to be monitored on a quarterly basis If the concentrations of MTBE in the perimeter wells continue to increase, it may be necessary to expand the groundwater monitoring well network r r r r r r r 7