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• 19 July 2000 AGE-NC Project No 96-0232 Page 17 of 29 ETBE, and TBA were detected in the water sample collected from well MW-1 at concentrations of 15µg11, 11 4g/1, and 54µg/1, respectively Methanol was detected in ground water samples collected from MW-5 (First Zone), MW-6A(First Zone), MW-6B (Second Zone), and in Flag City municipal wells No 1 and No 2 (Primary Aquifer Zone) at concentrations of 180 ug1l, 120 ug/l, 97 ug/l, 120,ug/l, and 73 ,ug/l, respectively Ethanol was detected in the storm drain grab water sample at a concentration of 1,200 4g/1 Analytical results of the ground water samples and grab samples are summarized in Tables 3, 4, and 7 The laboratory reports and chain-of-custody forms are presented in Appendix F 7 2 MAY MONTHLY MONITORING AND SAMPLING EVENT On 25,26 May 2000, ground water monitoring and sampling was performed at wells MW-1 through MW-13, DW-1, RDW-1, CSA-1, and CSA-2 Field procedures for purging and sampling the wells were performed as described in Section 7 1 1 for monitoring wells MWA through MW-7 The multi-level monitoring wells MW-8 through • MW-13 were purged by lowering and raising a 318-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the specific water-charged screened section Field data logs are included with Appendix G Following well purging, ground water levels in the monitoring wells achieved a minimum of 80 percent recharge prior to sample collection Ground water samples were collected from the purged wells utilizing new, disposable polyethylene bailers and polyethylene tubing Ground water sample collection from RDW-1, DW-1, CSA-1, and CSA-2 were achieved by opening the valve from the outlet sample port and allowing the pump to turn on and run for a minimum of 15 minutes to purge the wells prior to sampling Sample collection and preservation were performed as described in Section 7 1 1 7 2 1 Laboratory Analysis of Ground Water Samples Ground water samples were logged, transported, and analyzed following the same procedures in Section 7 1 2 , except for the addition of MTBE analysis by EPA Method 8020 on samples from MW-1 through MW-7, CSA-1, and CSA-2 ground water samples • Advanced GeoEm iranmcntal, Inc