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1 <br />' /9� <br /> oEc3MALTRix <br /> . Geomatnx also prepared the First Quarter 2003 Groundwater Monitoring Report (Geomatnx, <br /> 2003b) <br /> During the additional assessment activities, three new groundwater momtonng wells were <br /> installed around the perimeter of the former UST site (Figure 2) The three old wells (MW3-1, <br /> MW3-2, and MW3-3) and the three new wells (MW3-4, MW3-5, and MW3-6) were sampled <br /> during first quarter 2003 Also, one 40-foot deep direct-push boring (B3-14) was completed near <br /> a location where low-level impact to groundwater (B3-5) was previously reported at 41 feet bgs <br /> A grab groundwater sample was collected at 40 feet bgs in B3-14 No additional soil samples <br /> were collected during the investigation, because the approved well and boring locations were <br />' near previously sampled and tested soil boring locations <br /> During the additional assessment and first quarter 2003 groundwater monitoring, groundwater <br />' samples from the new wells and the soil bonng were tested for benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX), 1,2-dichloroethane, oxygenates, total petroleum hydrocarbons quantified as <br />' gasoline (TPHg), and dissolved lead The three old wells were tested for BTEX and TPHg <br /> Analytical results of groundwater sampled from the site monitoring wells are reported in the <br /> additional assessment and quarterly monitoring reports Groundwater samples from the three old <br /> wells and from one new well (MW3-6) are impacted by petroleum hydrocarbons (PHC) <br />' Oxygenates were not detected in samples from the new monitoring wells The oxygenate <br /> dusopropyl ether was detected at a concentration slightly greater than the reporting limit in the <br />' grab groundwater sample from B3-14 <br /> 2.0 FIELD PROCEDURES <br /> The following sections describe the field methods used by WGR to collect groundwater samples <br /> at UST Site No 3 <br /> 1 <br /> Groundwater samples were collected from six groundwater monitoring wells (MW3-1, MW3-2, <br /> MW3-3, MW3-4, MW3-5, and MW3-6) on May 28 and 29, 2003 Depth to groundwater was <br /> measured in all wells before purging Prior to sampling each well, the presence of separate- <br /> phase PHC was assessed About 100 gallons of water was purged from each well using a <br /> dedicated stinger and vacuum truck The wells were purged and sampled during a 2-day period <br /> On May 28, 2003,MW3-1, MW3-3, and MW3-2 were purged and sampled in that order On <br />' May 29, 2003, MW3-5, MW3-6, and MW3-4 were purged and sampled in that order <br /> i <br /> 1 <br /> 1\MjECI1GO \6437 00015437-11 da 2 <br />