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10 March 2000 <br /> AGE-NC Project No. 95-0137 <br /> Page 3 of 3 <br /> Monitoring: <br /> Quarterly ground water monitoring and sampling will be performed at the site on monitoring wells <br /> MW-1 through MW-8 throughout the remediation period to monitor remedial progress. <br /> Influent vapor concentrations, effluent vapor concentrations at the thermal oxidizer unit and the <br /> operational parameters (combustion temperature, volume of processed vapor, oxygen level and the <br /> Iower explosive limits (%LEL) or organic vapor level will be monitored on a weekly basis to ensure <br /> optimal destruction of recovered hydrocarbo.. vapor and to monitcr clean1ip progress. Depth to. <br /> ground water and dissolved oxygen measurements will be collected on a monthly basis to determine <br /> the effects of the IAS system. <br /> Laboratory reports for vapor analysis, testing methods, laboratory quality assurance/quality control <br /> (QA/QC)reports, and sample chain of custody documentation will be presented in quarterly reports. <br /> Upon the completion of six months of SVE system operation or when efficiency of the SVE unit has <br /> declined, `progress' monitoring of the remediation should be conducted. Soil samples will be <br /> collected from the "core" area of petroleum hydrocarbon impact at the site. After a minimum <br /> duration of 12 months of operation, soil samples will be collected from the known petroleum <br /> hydrocarbon-impacted soil at the site for`verification' monitoring. Analytical results of soil samples <br /> will be utilized to reassess the remaining petroleum hydrocarbon mass and to determine whether or <br /> not continued remedial action is necessary. <br /> Upon PHS-EHD approval of the RAWP,AGE will procure all necessary permits.AGE will schedule <br /> field inspections with your office 48 hours in advance of field activities. <br /> If you have any questions or comments, please contact the undersigned at{209) 467-1006. <br /> Sincerely, <br /> Advanced GeoEnvironmental, Inc. <br /> W <br /> William Little <br /> Staff Geologist <br /> cc: Mr. Alan Fetters <br /> Mr. James DeMera esq. - Mullen, Sullivan&Newton <br /> Advanced GeoEnvironmental,Inc. <br />