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Page 4 <br /> Mr Michael Infurna Jr, Senior REHS <br /> May 15,2003 <br /> • Oxygenate compounds TBA, MTBE and DIPE have been detected <br /> sporadically in groundwater samples <br /> EHD concurred with PESC's investigation findings and requested a work plan to <br /> remediate the site to "pre-release" conditions in their June 11, 2002 <br /> correspondence PESC submitted to EHD a July 23, 2002 Pilot Testing Work Plan <br /> that presented remedial alternatives and proposed performing an air sparging and <br /> soil venting pilot test to evaluate that method for full scale implementation EHD <br /> approved the work plan in correspondence dated August 6,2002 <br /> The <br /> air sparging and soil venting Pilot test was performed in January 2003 and <br /> results from that, submitted in PESC's March 6, 2003 Remedial Action Plan, <br /> indicated that this approach would be effective in remediating impacted soil and <br /> groundwater The EHD approved PESC's proposed remedial action approach in <br /> correspondence dated March 25, 2003 <br /> April 2003 Groundwater Monitoring <br /> On April 22 and April 23, 2003, Kleinfelder, Inc (under PESC's direction) <br /> collected groundwater samples from the four existing monitoring wells (MW-1 <br /> through MW-4) Prior to sampling, Kleinfelder's geologist measured groundwater <br /> levels within the wells with an electronic well sounder, checked for potential free <br /> phase petroleum product, and then purged a minimum of three well volumes from <br /> each well with clean, disposable bailers Free phase petroleum product was not <br /> observed in any of the wells Temperature, pH, and electrical conductivity <br /> parameters were also measured during the purging process to assess groundwater <br /> stability Purged groundwater was placed in one 55-gallon drum and temporarily <br /> staged on-site pending proper disposal <br /> Groundwater samples were collected from each well with its own dedicated <br /> bailer Samples were placed in clean, laboratory-provided glass containers, sealed, <br /> labeled, and stored in an insulated iced chest Samples were delivered to Severn <br /> Trent Laboratory in San Francisco, California, accompanied by chain-of-custody <br /> documentation, for chemical analysis Samples were analyzed for BTEX and <br /> TPHg compounds using EPA Method 602/8015 Samples were also analyzed for <br /> oxygenate compounds tert-butanol (TBA), methyl-tert-butyl ether(MTBE), <br /> di-isopropyl ether (DIPE), ethyl-tert-butyl ether (ETBE), and tert-amylmethyl <br /> ether(TAME) using EPA Method 8260B <br /> • <br />