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28 November 2005 <br /> AGE-NC Project No 96-0232 <br /> Page 4 of 8 <br /> I <br /> water flow direction towards the east-northeast at a hydraulic gradient of 0 001 ft/ft or less <br /> (Figure 4) <br /> " 2 4 2 Laboratory-Results of Ground Water Samples <br /> During the September 2005 sampling event, TPH-g was not detected in any water samples TPH-d <br /> was detected in water samples collected from wells MW-I2A at a concentration of 210 gg/l, the <br /> laboratory report noted that the TPH-d chromatogram contained significant diesel range compounds <br /> and/or no recognizable pattern <br /> MTBE was detected in water samples collected from wells MW-2, MW-613, MW-7, MW-8A, <br /> MW-9A,MW-11 (A and B),-MW-13 (A and B),MW-14 through MW-18,MW-19A and MW-20A <br /> at concentrations as high as 560 gg/l (MW-8A) Isoconcentration maps displaying the estimated <br /> extent of dissolved MTBE in First Zone and Second Zone aquifer are depicted in Figures 5, 6 and <br /> 7 <br /> No other constituents of concern were detected above laboratory reporting limits in the water <br /> samples collected during the third quarter 2005 sampling event Analytical results of ground water <br /> monitoring well samples are summarized in Tables 3 and 4 The laboratory reports (McCampbell <br /> Analytical Inc Work Order Nos 0509601 and 0509641)and chain of custody forms are presented <br /> in Appendix C, GeoTracker confirmation pages of the submitted laboratory electronic deliverable <br /> format(EDF) files are included in Appendix D <br /> 3.0. SUMMARY OF FINDINGS FROM QUARTERLY ACTIVITIES - - <br /> Previous soil characteristics data obtained by a CPT investigation enabled AGE to define five <br /> informal hydrogeologic units (Final Remediation Plan, dated 31 August 2000) The informal <br /> hydrogeologic units were defined as First Zone (10-35 feet bsg), Second Zone (40-60 feet bsg), <br /> Rocky's Upper Zone (65-75 feet bsg), Secondary Aquifer Zone (85-105 feet bsg), and Primary <br /> Aquifer Zone (130-150 feet bsg) The Rocky's Upper Zone was the shallowest ground water zone <br /> screened in the destroyed Rocky's domestic drinking water well <br /> Between November 2000 and 17 August 2004, a total volume of 27,086,201 gallons of MTBE- <br /> impacted water was treated at the site utilizing pump-treat and carbon filtration remediation <br /> technology, due to the lack of cost effectiveness for the clean-up of MTBE-impacted ground water, <br /> pump-and-treat operations were suspended on 17 August 2004 <br /> The results from the ground water monitoring and sampling events performed in September 2005 <br /> are as follows <br /> ( <br /> Advanced GcoEnvironmcntal,Inc <br />