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09 May 2003 AGE-NC Project No 96-0232 ' Page I 1 of 16 ' isoconcentration map displaying the estimated extent of dissolved MTBE in the area of the ground water extraction wells is depicted in Figure 8 ' No other constituents of concern were detected above laboratory reporting limits m the water samples collected during the first quarter 2003 sampling event Analytical results of ground water pl monitoring well samples are summarized in Tables 5 and 6 The laboratory reports (McCampbell Analytical Inc work order nos 0303416, 0303417 and 0303448) and chain-of-custody forms are presented in Appendix H 4.0• SUMMARY OF FINDINGS FROM QUARTERLY ACTIVITIES ' Previous soil characteristics data obtained by a CPT investigation enabled AGE to define five informal hydrologic units (Final Remediation Plan, dated 31 August 2000) The informal hydrogeologic units were defined as First Zone (10-35 feet bsg), Second Zone (40-60 feet bsg), Rocky's Upper Zone (65-75 feet bsg), Secondary Aquifer Zone (85-105 feet bsg), and Prim Aquifer Zone (130-150 feet bsg) The Roc �' screened in the destroyed Roc ky's Upper Zone was the shallowest ground water zone Y ky's domestic drinking water well The results of pump and treat ground water remediation between 05 December 2002 and 25 March 2003 is as follows C Approximately 2,871,250 gallons of MTBE-impacted from wells EW-4, EW-5, EW-8, EW-9 and EW-10, which were completed in the Firswater were extractetZa e ' aquifer(Appendix A, Table 8), due to a pump malfunction, well EW-8 was substituted for EW-5 between 27 January and 25 March 2003 A total volume of approximately 19,499,136 ' gallons of MTBE-impacted water has been treated at the site since the start-up period in November 2000 (Table 8) Dissolved MTBE was detected from grab samples collected at the influent-end of the ' treatment system at concentrations between 21 gg/l and 83 ab water samples collected at the effluent-end of the ump and trelat system did not dete t, laboratory analysis of any petroleum constituents of concern (Table 1) y extracted ground water was calculated to be 0 86 pounds (Table 8,Appendix D)E removed from th Between 05 December 2002 and 25 March 2003, the mass of Me ° A plat of cumulative ground water pump and treat mass removal versus time and a plot of influent ground water MTBE concentrations versus time are included in Appendix E, during the first quarter 2003, a general casual trend of increasing MTBE concentrations is evident for the first time since initiation of the ground water pump-and-treat system Advanced GeoEnvironmeatai,Inc.