Laserfiche WebLink
r <br /> • 3 0 CONCLUSIONS, RECOMMENDATIONS AND PROJECT STATUS <br /> r <br /> Between December 17, 2001 and March 19, 2002 groundwater levels rose an average of 3 25 <br /> feet, and the groundwater flow direction and gradient remained relatively constant During the <br /> past seven quarters of groundwater monitoring, the groundwater flow direction has remained <br /> north to northeast, at a relatively constant gradient <br /> Based on the results of previous subsurface investigations, soil and groundwater beneath the <br />' north end of the former middle UST are impacted by relatively low concentrations of gasoline <br /> hydrocarbons Most of the petroleum hydrocarbon mass remains concentrated in sod immediately <br />' below the north end of the former middle UST Vertically, the concentrations of gasoline <br /> hydrocarbons decrease rapidly with depth, and are defined between 65 and 80 feet bgs <br /> Laterally, the extent of impacted soil appears to be defined to the area of the former USTs <br /> Since noasoline compounds were detected in the four <br /> 9 p monitoring welts, any remaining impacted <br /> groundwater is probably limited to the area directly beneath the former UST The monitoring well <br /> network appears to adequately define the plume of impacted groundwater <br />�•� Based on these conclusions, Ramage Environmental recommends that the monitoring well <br /> network continue to be monitored and sampled on a quarterly basis for at least one more quarter <br />' The next groundwater monitoring is scheduled for June 2002 If, after the next quarter of <br /> sampling, groundwater continues to be free of gasoline compounds, the case should be <br /> considered for regulatory closure <br />' 11 <br />