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• Mr Michael Infuma <br /> Page 2 <br /> the February 27, 2001 monitonng data is depicted on Figure 2 Groundwater monitoring data are <br /> summarized in Table 1 Monitoring data sheets are included in Attachment A <br /> Prior to sampling, monitoring wells MW1 through MW3 were purged of a minimum of three well <br /> casing volumes During the purging process the physical parameters of temperature, pH and electrical <br /> conductivity were measured No sheens were noted during the purging of any site wells Samples <br /> were collected after the physical parameters stabilized and water level recovered 100% Purge water <br /> was contained in appropriately labeled DOT-approved 55-gallon drums The drums are currently <br /> being stored onsite 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 BTEX using EPA method 8020, TPHg and TPHd using modified EPA <br /> method 8015, and gasoline oxygenate additives, 1,2 DCA and EDB using EPA method 8260 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> EDB and 1,2 DCA were not detected in any site wells, and no detectable levels of TPHg, TPHd, <br /> BTEX, or gasoline oxygenate additives were present in the samples collected from wells MWl and <br /> • MW2 In the sample collected from MM3, BTEX was not detected, X TBE was detected at a level of <br /> 1,500 parts per billion (ppb), and TPHg and TPHd were reported at concentrations of 2,400 ppb and <br /> 5,700 ppb, respectively Analytical results are summarized in Table 2 Attachment B contains <br /> laboratory reports and chain of custody documentation <br /> SUMMARY <br /> • Groundwater levels at the site have risen since the last round of sampling <br /> • Groundwater flow direction remains in a northwesterly direction <br /> • This is the sixth consecutive sampling event where TPHg, TPHd, BTEX, gasoline oxygenates, 1,2 <br /> DCA and EDB have been at non-detectable levels in wells MW 1 and MW2 <br /> • BTEX was at non-detectable levels in well MW3 for the first time since groundwater monitonng <br /> and sampling began at the site, however detection limits were elevated <br /> • In well MW3, TPHg decreased slightly compared to the previous sampling, and TPHd decreased <br /> an order of magnitude <br /> • The level of MTBE increased slightly in well MW3 relative to the previous sampling event <br /> .1ary chAgmrN1gm2001 doc <br />