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S e , i • 12,February 2002 AGE-NC Project No 97-0312 , ' Page 7 of 18 3 5 MONITORING WELL INSTALLATION AND DEVELOPMENT I ' Following completion of the pilot soil borings,'the ground water monitoring wells will be installed in the soil bonngs It is anticipated that the shallow well will be screened from appfoximately 60 to 65 feet bsg and the deep well will be screened from approximately 85 to 90 feet bsg Following well installation, the wells will be developed to maximize water flow into the wells and minimize the amount of fine-grained sediment drawn into the wells dunng pumping or bailing Procedures for well installation and development are presented in Sections 4 4 and 4 5, respectively 3 6 GROUND WATER SAMPLE COLLECTION AND ANALYSIS " Ground water monitoring and sampling of the newly installed ground water monitoring wells will be conducted on a quarterly basis and will be incorporated into the ground water monitoring program currently in effect for the site Ground water monitoring activities will include recording depth to ground water measurements and proper collection of ground water samples Ground water sample collection procedures are described in Section 4 6 Groundwater samples will be analyzed by a DHS-certified laboratory for the following constituents • TPH-g and TPH-d in accordance with EPA Method 8015 Modified, • BTEX and MTBE in accordance with EPA Method 8020, • Fuel oxygenated compounds including DIPE, ETBE, MTBE, TAME, TBA, methanol and ethanol by EPA Method 8260 Modified, and • EDB and 1,2-DCA by EPA Method 8260 Modified Laboratory reports for ground water analyses,testing methods, laboratory quality assurance/quality control (QA/QC)reports, and sample chain of custody documentation will be presented in a report with the findings and recommendations If ground water is found to be significantly impacted by 1,2-DCA additional wells will be proposed in an addendum work plan to delineate the impacted ' ground water as directed by the EHD letter of 09 October 2001 ' I ' 4 _ In addition, ground water samples will be collected,and analyzed for TOC, in accordance with, ASTM Methods D854, D5084 and D2974;respectively, total colony units (CFU) indicates the Ipopulations of ndigenous total microbiological population as related to the hydrocarbon-degrading , bacteria(SM9215B)population at the site,pH(EPAI 50 1), concentrations ofpotassium,nitrogen, orthophosphate (total), potassium, ammonium (All EPA 300 or equivalent), and possibly, the presence of biotoxic compounds in the subsurface at the site, such as metals, pesticides or caustic r . materials (salts) The acquired data will be utilized in a future remediation feasibility report Advanced GeoEnvironmental,Inc ,