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Monitor wells completed in only the lower zone (50-80 feet bgs) will be completed with <br /> . same materials described above The largest screening interval will be equal to or less <br /> than 20 feet and dependent on the lithology and zones of contamination encountered <br /> Monitor wells completed in multiple zones will be completed with multichambered 17 <br /> inch diameter polyethylene tubing Screened intervals will be sandpacked as described <br /> above Zones between screened intervals will be sealed with hydrated bentonite and neat <br /> cement as described above <br /> TASK III: DEVELOPMENT AND SURVEYING OF WELLS <br /> Approximately three to four days after the monitor wells have been installed, they will be <br /> developed by swab and purge techniques to establish good hydraulic communication <br /> between the wells and the surrounding formation water A swabbing tool will be used to <br /> agitate and condense the sand pack across the slotted casing interval The wells will then <br /> be purged with a truck mounted vacuum lift pump until solids have been removed from <br /> the well casing and the ground water entering through the sand pack is no longer turbid <br /> On the same day as the wells are developed, the elevations of the tops of the well casings <br /> will be surveyed by a licensed surveyor to the nearest 0 01 foot and tied to an existing <br /> benchmark The surveyor will also provide rectangular coordinates for the monitor wells <br /> TASK IV: QUARTERLY GROUNDWATER MONITORING <br /> Groundwater samples will be collected from the newly installed monitor wells and <br /> analyzed by a certified laboratory on a quarterly basis Quarterly groundwater <br /> monitoring will be performed until the site is closed The methods and procedures <br /> currently used to obtain the groundwater samples from the three existing monitor wells <br /> will be employed to obtain and analyze groundwater samples from the proposed <br /> additional four monitor wells <br /> TASK V: REPORT OF RESULTS <br /> At the completion of drilling and receipt of laboratory results WEGE will prepare a report <br /> documenting the work performed including borehole logs, well completion diagrams, <br /> certified laboratory results from the soil samples, and surveyors plat map The <br /> documentation may be included within a quarterly groundwater monitoring report <br /> 7 ARC PUMP -WKPLN- 9128199 <br />