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SITE CLOSURE RE UEST REPORT <br /> Former Exxon Service Station No.7-3330 <br /> 3128 West Benjamin Holt Drive <br />' Stockton,California <br /> Delta Project No. D093-810 <br /> Page 16 <br /> MW-6 on May 5, 1996, to evaluate the aerobic conditions underlying the site. Dissolved oxygen <br /> readings from monitoring wells MW-3 through MW-6 reported concentrations favorable to aerobic <br /> biodegradation. Other physical processes such as volatilization, dispersion, and sorption will also <br /> contribute to the natural attenuation of any potentially remaining hydrocarbons. <br /> Based on the volume of hydrocarbons removed from the site, the small calculated volume of <br /> hydrocarbons potentially remaining in-place, and the non-detectable concentrations reported in ground <br /> water, Delta anticipates that biological degradation and natural attenuation will continue to decrease <br /> potentially remaining residual hydrocarbons at the site and that concentrations potentially remaining in <br /> soil and ground water currently do not pose a threat to human health. <br /> 8.0 REMARKSISIGNATURES <br /> The interpretations contained in this report represent our professional opinions and are based, in part, on <br /> I information supplied by the client. These opinions are based on currently available information and are <br /> arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time and <br /> location. Other than this, no warranty is implied or intended. <br /> RPT001.810 <br />