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1 <br /> 01 April 2004 <br /> AGE-NC Project No 97-0301 fJ <br /> Page 5 of 6 m10" O� p J <br /> i <br /> ' • Analysis of groundwater samples collected from MW-band MW-7 suggest the core of the <br /> plume is impacted by TPH-g, BTEX and 1,2-DCA The core of the First Water Zone <br /> dissolved gasoline plume appears to be currently distributed near the location ofwells MW-1 j m w <br /> and MW-7, and contained within network of wells consisting of MW-2, MW-3, MW- <br /> MW-6, MW-9A, MW-10A,MW-11A and MW-12A (Figure 4) <br /> • Significant concentrations of TPH-g,BTEX,DIPE and 1,2-DCA contaminants were detected <br /> ' for the first time at well MW-5 (screened between the Second and Third Water Zones),prior <br /> the November 2003 monitoring event only residual contaminants had been detected <br /> sporadically & 1 <br /> ' • Substantial concentrations of dissolved TPH-d and TPH-k have previously been detected in <br /> water samples collected from wells MW-1 and MW-7, Indicating a limited distribution of <br /> TPH-d and TPH-k in the area assessed <br /> • BTEX and 1,2-DCA concentrations in ground water samples MW-1t and MW-7 were <br /> substantially above their respective Maximum Contaminant Levels In drinking water <br /> • Very low concentrations of MTBE, AME, EDB and TBA have been detected at wells <br /> lie <br /> MW-1,MW-2,MW-3,MW-4,MW-6and MW-7 indicating that there is only a minor impact <br /> of these components <br /> • Based on one quarterly ground water monitoring event, the lateral and vertical extent of <br /> ' dissolved petroleum hydrocarbons appears to be limited to the First Water Zone on the site <br /> and approximately 50 feet north of the site � � _ N(,ils i SliY' � <br /> 5.0. RECOMMENDATIONS d-Jr d <br /> 10 <br /> Based upon data collected during November 2003,AGE recommends <br /> • Continued ground water monitoring utilizing wells MW-1 through MW-12 The next <br /> quarterly ground water monitoring event is tentatively scheduled for March 2004 <br /> • if applicable,conduct future ground water monitoring events concurrently with the Cal-Tank <br /> Lines site (3105 South El Dorado Street) <br /> ' Based on the entire set of data collected to date, additional ground water monitoring wells/soil <br /> borings are not warranted at this time and the existing monitoring well network may be sufficient <br /> ' to complete a site Corrective Action Plan(CAP) <br /> ' Advanced GeoEnvironmental,Inc <br />