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15 October 2000 AGE-NC Project No 96-0232 1 Page 12 of 15 ' MTBE was detected In ground water samples collected from wells MW-I,MW-4, MW-6B,MW-,7, _ MW-9A,MW-11A,MW-I IB,MW-12A and MW-13A at concentrations as lugh as 3,900µg/1 TBA - was detected in the water samples collected from MW-10C and MW-13D at concentration of 8 5 and 4 ' 53 µg11, respectively 1,2-DCA was detected in a water sample collected from MW-13A at a concentration of 4 3 ug/l Ethanol was detected in water samples collected from -MW-IOC, MW-10D,MW-11B, MW-13A and MW-13B at concentrations as high as 120,000µg/l, which may ' be residue contaminant introduced through use of coated bentonite pellets during well construction (See Problem Assessment Report) No other constituents of concern were detected above laboratory ' reporting limits None of the constituents of concern were detected in samples collected from the Rocky's Restaurant(RDW-1) domestic water well, the Three B's Truck Plaza domestic water(DW- 1), or the Flag City murncipal water wells (CSA-I and CSA-2) - 4 Analytical results of the ground water samples are summarized in Table 2 The laboratory reports (McCampbell Analytical Inc I D Nos 46237 through 46256 and 46435 through 46449) and chain- of-custody forms are presented in Appendix K ' . 6.0. SUMMARY OF FINDINGS FROM QUARTERLY ACTIVITIES Previous soil characteristics data obtained by a CPT investigation enabled AGE to define five tentative hydrologic units, First Zone(5-35 feet bsg), Second Zone (40-60 feet bsg), Rocky's Upper Zone (65-75 feet bsg), Secondary Aquifer Zone (85-105 feet bsg), and Primary Aquifer Zone (130-150 feet bsg) The Rocky's Upper Zone is the shallowest ground water screened in the Rocky's fdomestic drinking water well The results of ground water extraction from EW-I during July, August and September 2000 are as ' follows ' • Approximately 126,500 gallons of MTBE-impacted ground water were extracted_ from EW-1, which is completed m the First Zone • Initial-concentrations of dissolved MTBE were detected from EW-1 on 03 April 2000 at a ' concentration of 1,800 4g11;MTBE concentrations from EW-1 were last detected at 140µg/1 on 21 September 2000 , ' • Dung July 2000, MTBE was detected in three grab ground water sample's collected from EW-1 at an average 256µg/1 ' a During August 2000,MTBE was detected in four grab ground water samples collected from ' EW-1 at an average 1,315 µgll. • f During September 2000, MTBE was detected in one grab ground water samples collected 1 1 Advanced GeoEnvironment8l,Inc- ' s