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_ 5 <br /> C <br /> IKEI--P88-0810.WP1 <br /> i February 10, 1989 <br /> Page 3 <br /> 5. Well Construction: <br /> Casing Type: Schedule 40 PVC, flush threaded faints, 0.0211 <br /> factory slot, 2" diameter. Screen to run from total depth <br /> of the well to low rade, Monterey <br /> sand (#3) will fill the annular space rom ota1 depth to <br /> nine to ten feet below grade. A two foot thick bentonite <br /> seal will be placed in the annular space on top of the sand <br /> pack. Concrete will be poured from the top of the bentonite <br /> seal to the surface. <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 /> b. Water levels in the wells will be measured with an electro- <br /> nic soun3er. The wells will be developed using a surface <br /> 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 crntained 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. Ground 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 to <br /> development and sampling. <br /> Properly executed chain of custody documentation will <br /> accompany all samples. <br />