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Page 4 <br /> Mr Michael Infurna Jr,Senior RENS <br /> October 11, 2002 <br /> • Oxygenate compounds TBA, MTBE and DIPE have been detected <br /> sporadically in groundwater samples <br /> EHD concurred with PSC's investigation findings and requested a work plan to <br /> remediate the site to "pre-release" conditions in their June 11, 2002 <br /> correspondence PSC submitted to EHD a July 23, 2002 Pilot Testing Work Plan <br /> that presented remedial alternatives and proposed performing an air spargtng 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 /> PSC submitted a request to the California Underground Storage Tank Fund <br /> (Fund) on August 30, 2002 for pre-approval of reimbursable costs for the pilot <br /> test Currently, PSC is awaiting Fund pre-approval before implementing the test <br /> Third Quarter 2002 Groundwater Monitoring <br /> On September 25, 2001, Kleinfelder, Inc (under PSC's direction) collected <br /> groundwater samples from the four existing monitoring wells (MW-1 through <br /> MW-4) Prior to sampling, Kleinfelder's geologist measured groundwater levels <br /> within the wells with an electronic well sounder, checked for potential free phase <br /> petroleum product, and then purged a minimum of three well volumes from each <br /> 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, which was <br /> temporarily stored 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 Cert-butanol (TBA), methyl-tert-butyl ether (MTBE), <br /> dt-isopropyl ether (DIPF), ethyl-tert-butyl ether (ETBE), and <br /> tert-amylmethyl ether (TAME) using EPA Method 8260B <br />