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31 October 2002 <br /> AGE-NC Project No. 96-0254 <br /> Page 4 of 7 <br /> 3.4, MONITORING WELL INSTALLATION <br /> Following excavation, monitoring wells MW-1B, MW-4 and MW-7 will be replaced. The <br /> replacement wells will be constructed utilizing identical screen intervals and construction materials <br /> as the previous wells. The replacement wells will be developed approximately 24 hours after <br /> installation. <br /> 3.5. MONITORED NATURAL ATTENUATION <br /> AGE proposes monitored natural attenuation (NINA), or passive bioremediation, to address <br /> hydrocarbon-impacted ground water at the site. MNA relies on natural processes to degrade <br /> hydrocarbons. As discussed in Section 6.3 of the AGE prepared Corrective Action Plan, dated 18 <br /> July 2002,MNA is a passive remedial alternative,requiring no additional bacteria or nutrients to be <br /> added to ground water. <br /> 3.5.1. Ground Water Monitoring and Sample Analysis <br /> Based on recommendations presented in the United States Environmental Protection Agency's How <br /> to Evaluate Alternative Cleanup Technologies For Underground Storage Tank Sites-A Guide For <br /> Corrective Action Plan Reviewers, ground water monitoring and sampling will be conducted on a <br /> quarterly basis for the first year and annually thereafter. Ground water monitoring activities will <br /> include measuring depth to ground water and proper collection of ground water samples. Ground <br /> water sample collection procedures were described in Section 4.3 of the AGE-prepared Initial Work <br /> Plan, dated 15 January 1998. <br /> Ground water samples willbe analyzedby a DHS-certified laboratory for the following constituents: <br /> • TPH-g and TPH-d in accordance with EPA Method 8015 Modified; <br /> • BTEX and fuel additivies including DIPE,ETBE,MTBE,TAME,TBA,EDB and 1,2-DCA <br /> by EPA Method 826013; and <br /> • Dissolved oxygen,carbon dioxide,pH,alkalinity,hardness,soluble iron and redox potential. <br /> Laboratory reports for ground water analyses,testing methods,laboratory quality assurance/quality <br /> control (QA/QC)reports, and sample chain of custody documentation will be presented in a report <br /> with the findings and recommendations. <br /> Advanced Geo Environmental,Inc. <br />