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Ms Linda Turkatte <br /> January 4, 1996 <br /> Page 2 <br /> soil <br /> In subsequent investigations six soil borings were advanced in the vicinity of the former <br /> underground storage tank and converted to groundwater monitoring wells (MW 1 through MW6) <br /> The borings/wells were completed at depths of approximately 30 feet below grade to investigate <br /> and define the extent of hydrocarbon impaction in soil and groundwater The boring/well <br /> locations are shown on Figure 2 <br /> GROUNDWATER MONITORING AND SAMPLING <br /> Ground Zero personnel performed groundwater monitoring and sampling on December 20, 1995 <br /> Based upon the depth to water measurements in wells MW 1 through MW6, the water table <br /> elevation has increased an average of 1 01 feet since the last monitoring event on September 28, <br /> 1995 Historical groundwater monitoring data are summarized in Table 1 <br /> Groundwater beneath the site generally flows southeasterly with an overall gradient of <br /> approximately 0 01 ft/ft (53 ft/mile) A potentiometric surface map for the December 20, 1995 <br /> monitoring episode is shown on Figure 2 <br /> Groundwater samples were collected from wells MW 1 through MW6 after purging and <br /> stabilization of physical parameters (pH, electrical conductivity, and temperature) Well purge <br /> logs are included in Attachment A <br /> LABORATORY ANALYSIS <br /> Groundwater samples were placed on ice and transported under chain-of-custody protocol to state <br /> certified Argon Laboratories Samples were analyzed for BTEX and TPHG by EPA methods <br /> 8020 and 8015 modified, respectively No xylenes or petroleum hydrocarbon constituents were <br /> detected above laboratory method detection limits Analytical results are summarized in Table <br /> 2 Laboratory reports and chain-of-custody documentation for samples collected on December <br /> 20, 1995 are presented in Attachment B <br /> CONCLUSIONS <br /> No xylenes or petroleum hydrocarbon constituents were detected in samples collected from any <br /> of the six site monitoring wells for the second consecutive quarter, evidence that natural <br /> biodegradative processes have successfully reduced dissolved contaminants to acceptable levels <br /> 9roundzeN1aid1aw13QR1995 rpt <br />