ARCHIVED REPORTS_NOTICE OF INTENT FOR INSTALLATION, OPERATION AND MAINTENANCE OF AN OZONE INJECTION GROUNDWATER REMEDIATION SYSTEM

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' possible exception of naphthalene, well MW-1 appears to have been largely unaffected by the pilot ' test as TPHg and BTEX concentrations remained similar to baseline levels throughout the pilot test. No increasing trends for DO were apparent for the three source area wells during the duration of the ' pilot test. Although, slightly higher DOs were measured for MW-1 after 60 and 90 days of OS. 2.5.2 Uparadient and Downgradient Well Results The baseline, 30-day, 60-day and 90-day TPHg, benzene, naphthalene and DO 1,esults for the ' upgradient and downgradient wells are summarized below. Well No. Date TPHg Benzene Naphthalene DO (µg/1) (µg/1) (pg/1) (ppm) ' MW-7 11/10/08 <50 <1.0 <0.50 --- (upgradient well) 3/9/09 <50 <0.50 <0.50 4.39 ' Screened from 30'-60' 4/15/09 <50 0.57 <0.50 4.10 5/11/09 ' MW-5 11/10/08 <50 <0.50 <0.50 (downgradient well 3/9/09 <50 <0.50 <0.50 2.43 Screened from 26'-64' 4/15/09 <50 ---70.50 <0.50 2.02 ' 5/11/09 <50 <0.50 <0.50 1.94 MW-6 11/10/08 <50 <0.50 <0.50 -- (downgradient - (down adient well) 3/9/09 <50 <0.50 <0.50 0.41 Screened from 31'-62' 4/15/09 <50 <0.50 <0.50 0.19 5/11/09 <50 <0.50 <0.50 0.24 =Not reported TPHg, BTEX and naphthalene concentrations for upgradient well MW-7 and downgradient wells MW-5 and MW-6 were not reported at concentrations greater than or equal to their respective laboratory MRLs prior to, during and following the OS pilot test, with the exception of 0.57 µg/l of ' benzene reported from the April 15, 2009, sampling of upgradient well MW-7. ' No increasing DO concentration trends were apparent for the upgradient and downgradient wells over the duration of the pilot test. ' Summaries of the groundwater data are presented in Tables 1 and 2. Copies of the laboratory reports and chain of custodies are presented in Appendix B. Project No.59183-06-02 -7- July 2,2009