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' TreadvvelOW10 • ' 5 0 CONCLUSIONS AND RECOMMENDATIONS The soil and groundwater remediation tasks proposed in the 14 February 2005 workplan for the Site have been completed All soil proposed for excavation around former sample CPT-EXC- BT19 has been excavated and sent off-site for disposal or reuse Soil sample CPT-EXC-BT19 contained TPHg concentrations of 2,300 mg/kg, and sample CPT-EXC-25, collected at the ' bottom of the excavation approximately 6-feet below CPT-EXC-BT19, did not contain any detectable TPHg concentrations Approximately 7,500 gallons of hydrocarbon impacted groundwater was pumped out of the excavation and disposed of in the sanitary sewer The former excavation area was backfilled as described in Section 4 6 Prior to backfilling, 800 pounds of ORC® was added to the excavation to accelerate the bioremediation of impacted groundwater The 14 February 2005 workplan for the Site included a proposed groundwater monitonng program As discussed in the workplan, the planned site development includes installing new ' utility lines and replacing sidewalks where monitoring well locations are planned The development is scheduled to be completed in early to mid-2006 and monitoring work can begin ' at that time ' 6.0 LIMITATIONS ' Activities undertaken as part of this remediation work was conducted on behalf of the City of Stockton to assess the presence of petroleum hydrocarbons in soil and groundwater in the ' vicinity of the former UST locations No other party should rely on the information presented in this document without the express written permission of Treadwell &Rollo The conclusions presented in this report are professional opinions based on the specific activities conducted Treadwell &Rollo makes no guarantees or warranties with respect to the accuracy or completeness of this information Opinions and recommendations presented herein apply to site ' 25971024 DGD 9 7 June 2005