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Filter packs of Monterey#3 graded and washed sand will be placed in the annular spaces <br /> between the boreholes and well casings and approximately two feet above the tops of the <br /> screened intervals(i.e., 43 feet bgst. The wells will be surged and purged by the driller, following <br /> the placement of the sand packs and prior to the installation of the well seals. periodic surging <br /> and purging of each well will continue until at least five well volumes have been removed, <br /> Overlying the filter packs, two feet of hydrated bentonite chips will be placed within the annular <br /> spaces between the boreholes and the well casings i.e,, 41 to 43 feet bgs . Over the hydrated <br /> bentonite, surface seals f neat cement grout will be installed. The tops of the wells will be <br /> secured with watertight daps and traffic-rated, flush-mount street boxes, <br /> licensed land surveyor will survey each of the newly-installed'wellheads, The surveyor will <br /> measure the elevations of the tops of well casings to the nearest 0.01 foot, referenced to a <br /> benchmark: The locations of the wells and other site features res will also be surveyed. <br /> 3.2.2 Soil Sam lin and An sig <br /> During drilling, undisturbed soil samples will be collected at five-foot i <br />