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f <br /> Mr Russell F Chapin, Sr <br /> May 15, 1995 <br /> Page 4 <br /> • The annular space of the well will be packed with sorted sand to a point approximately <br /> 0 5 ft above the top of the perforated casing A 2-ft thick plug consisting of bentonite pellets or <br /> chips will be placed above the sand in the wells to prevent cement from entering the sand pack <br /> The remaining annulus will be backfilled with a mixture of neat cement and powdered bentonite <br /> (<5%)to grade <br /> DESIGN AND INSTALL YSTEM <br /> The remedial system selected for installation will be designed, permitted, and installed <br /> This phase will include appropriate negotiations with agencies regulating soil and groundwater <br /> assessment and cleanup projects, air emissions, sewer disposal of treated water, and others The <br /> system recommended is capable of extracting and treating both soil vapor and groundwater, and <br /> will include subgrade trenches for extraction and sparging lines <br /> Chapin Bros Inc will be presented with comparative costs of purchasing or renting <br /> equipment for the site It is our judgement that the site could make use of an internal combustion <br /> engine for a period not likely to exceed 3 months, after which it would be appropriate to replace <br /> the engine with a blower using activated carbon as the primary emissions control method Based <br /> on an estimated duration of the remedial action exceeding one year, it is our recommendation <br /> that the engine equipment be leased or rented and that the air spargmg equipment be purchased <br /> If purchased, the equipment would be available after completion for resale or buyback by the <br /> manufacturer The equipment will be designed to be easily transported or stored <br /> OPERATE AND MAINTAIN SYSTEM <br /> The system will be operated and maintained at minimum monthly intervals with quarterly <br /> reports of system performance <br /> VERIFICATION SAMPLING <br /> Progress sampling was requested in the request for bid, which was to consist of drilling <br /> soil borings and evaluating selected soil and/or groundwater samples We have presented <br /> estimates of costs for drilling four soil borings and collecting and analyzing two soil samples per <br /> boring <br /> 4058"P2 LUSH GEOSCIENCEs <br />