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• Mr Jeffery Wong <br /> Page 2 <br /> Prior to sampling, wells MW 1 through 1\4W4 were purged of a nunimum of three well casing volumes <br /> During the purging process physical parameters (temperature, pH and electrical conductivity) were <br /> measured in each respective well, and a light sheen developed in well MW1 Groundwater samples <br /> were collected after the physical parameters stabilized, and the water levels recovered to at least 80% <br /> of the initial depth to water measurements Subsequently the samples were placed in an ice chest <br /> cooled to a temperature of approximately 4° degrees Centigrade Purgewater was contained in <br /> appropriately labeled DOT-approved 55-gallon drums, and is currently being stored onsite pending <br /> proper disposal options Purge logs are included in Attachment A <br /> Groundwater samples were delivered under chain of custody protocol to Argon Laboratories (FLAP <br /> #2359) Analysis consisted of gasoline oxygenate additives, 1,2 DCA and EDB using EPA method <br /> 8260, BTEX using EPA method 8020, and TPHg using modified EPA method 8015 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> 1,2 DCA and EDB were not detected in well MW3 for the second consecutive sampling event, and <br /> gasoline oxygenate additives were not detected in wells MW 1 through MW4 TPHg ranged from <br /> 190 parts per billion (ppb) to 280,000 ppb, and benzene ranged from 1 I ppb to 20,000 ppb in <br /> iwells MW3 and MWI, respectively Concentrations of 1,2 DCA ranged from 300 ppb (MW4) to <br /> 640 ppb (MW I), and EDB was detected in well MW 1 at a concentration of 250 ppb <br /> Analytical results are summarized in Table 2 Attachment B contains laboratory reports and chain of <br /> custody documentation <br /> SUMMARY <br /> • Groundwater flow was away from an apparent groundwater mound in the vicinity of well MW 1 <br /> • TPHg, BTEX and 1,2 DCA concentrations were generally snnilar to those recorded during the <br /> previous sampling event <br /> • Concentrations of gasoline oxygenate additives remained at non-detectable levels in all wells <br /> • EDB was not detected in wells MW2 through MW4, and 1,2 DCA was not detected in well MW3 <br /> for the second consecutive event <br /> Hazryslreportslgmr\2gm2001 doc <br />