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ppm <br /> � tivasm- <br /> '47 <br /> r�" rod kF <br /> o Bentonite pellets will be ,place above the sand pack to form <br /> a 2 foot bentonite seal. <br /> o The remaining annular space will be grouted to the surface <br /> with a cement/bentonite grout. <br /> The wells will be completed with a locking -)tective casing <br /> above-ground and, where well stick-up is c-. concern, in a <br /> flush-mounted christy box. <br /> The wells will be developed by swabbing, bailing and pumping. <br /> All equipment used in well construction will be decontaminated <br /> using a portable steam cleaner. The well locations and elevation <br /> will be surveyed for horizontal location to a permanent fixture <br /> on-site and a USGS/UCGS elevation benchmark. <br /> 2.5 GROUNDWATER SAMPLING <br /> Following a period of at least 7 days after well development, the <br /> monitoring wells will be sampled. The following chemical <br /> analyses will be performed: <br /> u o EDB (DHS - AB1803) <br /> 0 organolead (by AA) <br /> o BTX&E (EPA 502) <br /> o TPH - light and heavy fractions (Sw8015-modified) <br /> The samples will be collected following the procedures outlined <br /> below: <br /> o Water level measurements will be taken to the nearest 0.01 <br /> foot with respect to the established survey point on top of <br /> the well casing. All measuring devices used in the well <br /> will be thoroughly rinsed with distilled water prior to <br /> The depth to the <br /> reuse. top of the water will be subtracted <br /> from the total casing depth to detee hhagh ngand, <br /> subsequently, the volume of standing water <br /> aihe <br /> for the <br /> o The surface of the water column will be thxaaintda transparent <br /> presence of hydrocarbons by bailing <br /> Teflon bailer. if present, the thickness of the hydrocarbon <br /> sampled. The TPH sample will <br /> layer will be measured and be <br /> collected at this time. <br /> O To ensure collection of samples representative of groundwa- <br /> to <br /> ter quality, a submersible pump or bailer will be used to three ee <br /> remove a quantity of water from the well equal <br /> times the calculated volume of water in the well casing. <br /> o To collect representative groundwater samples if floating <br /> hydrocarbons are present, a "thief sampler" or other point <br /> pampler roduct. w <br /> ill be used to minimize the influence of free <br /> P otherwise, samples will be obtained using a Teflon <br /> .�_ 2 - 4 <br />