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EIN <br /> KEZ-P88-0810.W1 <br /> February 22, 1989 <br /> Page 3 <br /> 5. Well Construction: <br /> Casing Type: Schedule 40 PVC, flush threaded joints, 0.02" <br /> factory slot, 2" diameter. Screen to run from total depth <br /> of the well to Iy ei <br /> Monterey sand (#3) will fill the annular space from total <br /> depth to approximately six feet below grade. A one foot <br /> thick bentonite seal will be placed in the annular space on <br /> top of the sand pack. Concrete will be poured from the top <br /> of the bentonite seal to the surface (from zero to five <br /> feet) . <br /> Each well casing will -be secured with a waterproof cap and a <br /> padlock. A round flush-mounted well cover will be concreted <br /> in place over the top of each casing. <br /> 6. Water levels in the wells will be measured with an electro- <br /> nic sounder. The wells will be developed using a surface <br /> r pump approximately one week after; well completion. Wells <br /> will be pumped until expelled water is clear and free of <br /> turbidity. Effluent generated during well development will <br /> be contained in barrels and hauled from the site by a <br /> licensed hazardous materials hauler. <br /> Well cover elevations will be surveyed to an assumed datum. <br /> 7. Grouna Water Sampling: <br /> The wells will be purged with a surface bailer approximately <br /> four casing volumes prior to sampling; at least 24 hours <br /> after development. After recovery, samples will be col- <br /> lected using a clean Teflon bailer and will be promptly <br /> decanted into 40 ml VOA vials and one liter amber bottles as <br /> appropriate. Vials and bottles will be sealed with Teflon- <br /> lined screw caps, labeled and stored on ice for delivery to <br /> a....state._.certified....laboratory. .. The..-sampling....bailer- will be <br /> cleaned with soap and a clean water rinse between uses <br /> Wells will be checked for free product and sheen prior td: <br /> - <br /> development and sampling. <br /> Properly executed chain of custody documentation will <br /> accompany all .samples. <br />