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iGeologwal7echnics 2nc Page 4 Groundwater Monitoring Report Project No 723 2 June 29,2000 ' * None of the oxygenated fuel compounds were detected by EPA method 8260 However the detection limits had to be raised due to the high levels of BTEX and TPH-G that were present in many of the groundwater samples • Preliminary investigation of the domestic well DW @ 60 East Castle revealed that it is approximately 70 feet deep and is observed to have tree roots protruding through the well casing into the well at a depth of approximately 10 to 15 feet bgs The groundwater sample collected on May 4, 2000 did not contain contaminant concentrations above the laboratory limits The well had previously contained trace amounts of Toluene and Xylene and low levels of TPH-G 3.0 CONCLUSIONS & RECOMMENDATIONS Conclusions 1 The groundwater plume is not defined vertically or laterally 2 Groundwater flow trends to the northeast to east 3 High levels of BTEX and TPH are present in the groundwater of all wells 4 Oxygen fuel compounds were not detected for the second consecutive event, although they have previously been detected in all seven monitoring wells 5 The groundwater in the vicinity of the domestic well may be contaminated �I Recommendations 1 Continue quarterly groundwater monitoring, with the next monitoring event scheduled in ' August of 2000 2 Due to the presence of the oxygenated fuel compounds during previous monitoring events, the quarterly monitoring events should include analysis by EPA method 8260 3 Complete the water well receptor survey for the site 4 The Domestic Well @ 60 east Castle Street should be investigated by video imaging to determine well construction, current condition, and potential for impacting the deeper Iaquifer 4.0 LIMITATIONS ' This report was prepared in accordance with the accepted standards and practices of the field of environmental geology, groundwater hydrology and good business practices It should be recognized that definition and evaluation of environmental conditions is a difficult and inexact science Judgments leading to conclusions and recommendations are generally made with an incomplete knowledge of the sate-specific conditions present The tasks proposed and completed during this project were reviewed and approved by the local regulatory agency for compliance with the law No warranty, expressed or implied, is made