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LW GeologicafTechnirs Inc. Page 4 Groundwater Monitoring Report Project No. 723.2 January 19, 2000 ,,� • The groundwater sample collected from the old domestic well located at 0 East Castle showed the presence �6i ' p c of law levels ofS.Q.lue��Xvlene and TPH-G. This well is not be;ng used for a water supply and does not have a pump in it that could be activated so the a. potential for exposure to the public is minimal. The well has a measured total depth of 70 feet. The construction is unknown. A watertight locking cap and traffic rated well box were installed on this well during the monitoring event. O- • Preliminary investigation of the domestic well DW @ 60 East Castle is approximately 70 feet deep and is observed to have tree roots protruding through the well casing into the well. The contamination concentration in this well are increasing, which causes some concern for allowing the contamination to enter the deeper porting of the aquifer. • During field monitoring/well purging work, water qu y parameters were measured, including Oxidation-Reduction Potential (ORP). Th ORP results show a direct correlation of negative values for wells in the contamina ed zone. Thus suggesting that natural biodegradation of these chemicals is not a significdnt attenuation process. • To date, no wells are located outside the contaminated zone. The domestic well and the deep well did show positive ORP values. 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 groundw ter of all wells. 4. Oxygen fuel compounds have been detected. 1 5. It appears that the groundwater in the vicinity of the domestic well may be contaminated. Recommendations 1. Continue quarterly groundwater monitoring, with the next monitoring event scheduled in LW March of 2000. 0- 2. 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. 1-0 3. Complete the water well receptor survey for the site. v\.c 4. The Domestic Well @ 60 east Castle Street should be investigated to determine well construction, current condition, and potential for impacting the deeper aquifer. 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 LW