SITE INFORMATION AND CORRESPONDENCE FILE 1

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Georges Service Page Z of 3 4, The Work Plan proposes to collect groundwater samples from monitoring wells(MWs)at the site every quarter for one year to monitor the attenuation of the contaminant plume. If attenuation is not evidenced at the end of this period of time a dedicated vapor extraction well must be installed within 60 days and a pilot test conducted as outlined in the Work Plan. Initiate the AS/SVE alternative as proposed in the Work Plan within 60 days of successful pilot test results. In the event that the contaminant attenuation goals are not met, PHSIEHD may apply further conditions to this work. 5. The Work Plan states that a PVC oxygen aeration pipeline grid may be installed after soil excavation occurs during the rock filling of the pit, if conditions warrant. Prior to placing this pipe, soil samples from targeted soil depths must be obtained for microbial culture analysis. It must be demonstrated that sufficient aerobic soil microorganisms exist to warrant oxygen injection. Submit the analytical results of laboratory analysis for aerobic bacteria to PHSIEHD. 6. Anaerobic and aerobic bacterial action must be monitored at the site. Refer to EPA document 510-13- 94-003 entitled"How To Evaluate Alternative Cleanup Technologies For Underground Storage Tank Sites, Exhibit IX-4"for all monitoring parameters required. 7. A cost breakdown for the soil sampling and landfill disposal of contaminated soil must be provided to PHSIEHD prior to source removal activities at the site. Also include the cost breakdown for soil and groundwater sampling to be conducted during the excavation, attenuation monitoring, and remedial action confirmation activities. 8. A specific list of all equipment that will be utilized at the site to remove and transport soil must be made available to PHSIEHD prior to source removal activities at the site. The equipment to be used must be cost effective and appropriate for the job. The cost breakdown for labor, transportation costs, equipment,rock fill and paving costs must be provided to PHS/EHD. State where the rock fill will be obtained from. 9. Complete, accurate,and properly labeled cross sections must be provided to PHSIEHD prior to initiating remedial action work. The cross sections should follow standard geologic protocol and be labeled A to A' and B to B'. The cross sectional lines A to A' and B to B' should be placed on the site map for easy reference. Information from borings that do not fall on the line A to A' or B to B'but that are included in the cross section should be clearly marked as projected borings. The concentration of total petroleum hydrocarbons-gasoline(TPHg)detected in samples should be marked at the appropriate depth for each boring included in the cross section. The units of concentration for the sample results should also be included on the cross section. The concentration of benzene detected in samples should also be marked at the appropriate depth for each sample included in the cross section, and the units of concentration for benzene should be included as well. Additionally,TPHg and benzene should be clearly designated on the cross section to avoid confusion. A standard explanation should be included with the cross section that defines all units,abbreviations, and symbols used,as well as the horizontal and vertical scales used to create the drawing. 10. A complete,accurate,and properly labeled site map with isoconcentration contour lines depicting groundwater contamination must be provided to PHSIEHD prior to initiating remedial action work. Isoconcentration reaps should be completed for TPHg,benzene, and any other current contamination detected in the groundwater at the site. The units of concentration for TPHg and benzene must be included on the map.