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Mr Mike Infurna <br /> Page 2 <br /> A potentiometric surface map generated using the March 18, 2003 groundwater monitoring <br /> data is shown on Figure 2 Groundwater monitoring data are summarized in Table 1 <br /> Monitoring data sheets are included in Attachment A <br /> On March 18, 2003, wells MW1 through MW4 and U-Haul well MW7 were purged and <br /> sampled At least three well casing volumes were purged from each well During the purging <br /> process, temperature, pH and electrical conductivity parameters were measured Groundwater <br /> samples were collected after physical parameter stabilization and appropriate groundwater <br /> recovery The samples were stored in an ice chest refrigerated to a temperature of <br /> approximately 4°C Purgewater was contained in appropriately labeled DOT-approved 55- <br /> gallon drums Purge logs are included in Attachment A <br /> Groundwater samples were delivered under chain of custody protocol to Argon Laboratories <br /> (FLAP #2359) Analysis consisted of gasoline oxygenate additives, 1,2-DCA and EDB using <br /> EPA method 8260, BTEX using EPA method 8020, and TPHg using modified EPA method <br /> 8015 <br /> GROUNDWATER ANALYTICAL RESULTS <br /> Tert-butanol (TBA) was detected 1n wells MW2 and MW3 at concentrations of 79 parts per <br /> billion (ppb) and 38 ppb, respectively Di-isopropyl ether (DIPE) was detected in well MW2 <br /> at 46 ppb No other gasoline oxygenate additives were detected at the site <br /> 1,2-DCA was detected at a concentration of 1,300 ppb in well MW1 and at a concentration of <br /> 310 ppb in well MW2 The level of 1,2-DCA detected in well MW 1 was its highest to date <br /> 1,2-DCA was not detected in wells MW3, MW4 and U-Haul MW7 EDB was not detected in <br /> any well <br /> TPHg and benzene were detected in each well TPHg concentrations ranged from 240 ppb in <br /> MW3 to 130,000 ppb in MW1 Benzene levels ranged from 16 ppb to 11,000 ppb in wells <br /> MW3 and MW1, respectively Analytical results are summarized in Table 2 Attachment B <br /> contains laboratory reports and chain of custody documentation <br /> PURGEWATER DISPOSAL <br /> On March 18, 2003, American Valley Waste Oil, Inc (CAL000827878) removed and <br /> transported approximately 250 gallons of purgewater generated from groundwater monitoring <br /> activities to a permitted disposal/recycling facility A copy of the non-hazardous waste <br /> manifest is included in Attachment A <br /> G%GROUNDZEIHARRYSXReports\QMR1200311QM2003 doc <br />